From ce22c023878d2b2e5963f379857ccec4815aeede Mon Sep 17 00:00:00 2001
From: Ionela Voinescu <ionela.voinescu@imgtec.com>
Date: Wed, 24 Sep 2014 17:05:33 +0100
Subject: libpayload: arch/mips: Add basic MIPS architecture support

Add the basic build infrastructure and architectural support
required to build for targets using the MIPS architecture.
This will require the addition of cache maintenance.

BUG=chrome-os-partner:31438
TEST=tested on Pistachio FPGA with Depthcharge as payload;
     successfully executed payload.
BRANCH=none

Change-Id: I75cfd0536860b6d84b53a567940fe6668d9b2cbb
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 758c8cb9a6846e6ca32be409ec5f7a888ac9c888
Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
Original-Change-Id: I0b9af983bf5032335a519ce2510a0b3aca082edf
Original-Reviewed-on: https://chromium-review.googlesource.com/219740
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8741
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
---
 payloads/libpayload/Config.in                     |  12 ++
 payloads/libpayload/Makefile                      |   2 +
 payloads/libpayload/Makefile.inc                  |   1 +
 payloads/libpayload/arch/Config.in                |   3 +-
 payloads/libpayload/arch/mips/Config.in           |  29 +++
 payloads/libpayload/arch/mips/Makefile.inc        |  39 ++++
 payloads/libpayload/arch/mips/cache.c             |  76 ++++++++
 payloads/libpayload/arch/mips/coreboot.c          |  55 ++++++
 payloads/libpayload/arch/mips/dummy_media.c       |  41 +++++
 payloads/libpayload/arch/mips/exception.c         | 107 +++++++++++
 payloads/libpayload/arch/mips/exception_asm.S     | 208 ++++++++++++++++++++++
 payloads/libpayload/arch/mips/gdb.c               |  32 ++++
 payloads/libpayload/arch/mips/head.S              | 110 ++++++++++++
 payloads/libpayload/arch/mips/libpayload.ldscript |  95 ++++++++++
 payloads/libpayload/arch/mips/main.c              |  62 +++++++
 payloads/libpayload/arch/mips/selfboot.c          |  36 ++++
 payloads/libpayload/arch/mips/string.c            |  72 ++++++++
 payloads/libpayload/arch/mips/sysinfo.c           |  53 ++++++
 payloads/libpayload/arch/mips/timer.c             |  43 +++++
 payloads/libpayload/arch/mips/util.S              |  26 +++
 payloads/libpayload/arch/mips/virtual.c           |  27 +++
 payloads/libpayload/bin/lpgcc                     |   6 +
 payloads/libpayload/configs/config.arm64-generic  |   5 +-
 payloads/libpayload/configs/defconfig             |   3 +-
 payloads/libpayload/configs/defconfig-arm         |   5 +-
 payloads/libpayload/configs/defconfig-mips        |  75 ++++++++
 payloads/libpayload/drivers/Makefile.inc          |   2 +
 payloads/libpayload/drivers/timer/img_pistachio.c |  36 ++++
 payloads/libpayload/include/mips/arch/byteorder.h |  43 +++++
 payloads/libpayload/include/mips/arch/cache.h     |  98 ++++++++++
 payloads/libpayload/include/mips/arch/cpu.h       |  85 +++++++++
 payloads/libpayload/include/mips/arch/exception.h |  90 ++++++++++
 payloads/libpayload/include/mips/arch/io.h        |  67 +++++++
 payloads/libpayload/include/mips/arch/stdint.h    |  95 ++++++++++
 payloads/libpayload/include/mips/arch/types.h     |  76 ++++++++
 payloads/libpayload/include/mips/arch/virtual.h   |  31 ++++
 payloads/libpayload/include/swab.h                |  44 +++++
 payloads/libpayload/util/xcompile/xcompile        |  28 ++-
 38 files changed, 1906 insertions(+), 12 deletions(-)
 create mode 100644 payloads/libpayload/arch/mips/Config.in
 create mode 100644 payloads/libpayload/arch/mips/Makefile.inc
 create mode 100644 payloads/libpayload/arch/mips/cache.c
 create mode 100644 payloads/libpayload/arch/mips/coreboot.c
 create mode 100644 payloads/libpayload/arch/mips/dummy_media.c
 create mode 100644 payloads/libpayload/arch/mips/exception.c
 create mode 100644 payloads/libpayload/arch/mips/exception_asm.S
 create mode 100644 payloads/libpayload/arch/mips/gdb.c
 create mode 100644 payloads/libpayload/arch/mips/head.S
 create mode 100644 payloads/libpayload/arch/mips/libpayload.ldscript
 create mode 100644 payloads/libpayload/arch/mips/main.c
 create mode 100644 payloads/libpayload/arch/mips/selfboot.c
 create mode 100644 payloads/libpayload/arch/mips/string.c
 create mode 100644 payloads/libpayload/arch/mips/sysinfo.c
 create mode 100644 payloads/libpayload/arch/mips/timer.c
 create mode 100644 payloads/libpayload/arch/mips/util.S
 create mode 100644 payloads/libpayload/arch/mips/virtual.c
 create mode 100644 payloads/libpayload/configs/defconfig-mips
 create mode 100644 payloads/libpayload/drivers/timer/img_pistachio.c
 create mode 100644 payloads/libpayload/include/mips/arch/byteorder.h
 create mode 100644 payloads/libpayload/include/mips/arch/cache.h
 create mode 100644 payloads/libpayload/include/mips/arch/cpu.h
 create mode 100644 payloads/libpayload/include/mips/arch/exception.h
 create mode 100644 payloads/libpayload/include/mips/arch/io.h
 create mode 100644 payloads/libpayload/include/mips/arch/stdint.h
 create mode 100644 payloads/libpayload/include/mips/arch/types.h
 create mode 100644 payloads/libpayload/include/mips/arch/virtual.h
 create mode 100644 payloads/libpayload/include/swab.h

diff --git a/payloads/libpayload/Config.in b/payloads/libpayload/Config.in
index 6c95bfa42d..7587b6ac8b 100644
--- a/payloads/libpayload/Config.in
+++ b/payloads/libpayload/Config.in
@@ -98,6 +98,11 @@ config ARCH_ARM64
         help
           Support the ARM64 architecture
 
+config ARCH_MIPS
+	bool "MIPS"
+	help
+	  Support the MIPS architecture
+
 endchoice
 
 config MEMMAP_RAM_ONLY
@@ -390,6 +395,13 @@ config TIMER_IPQ806X
 
 config TIMER_RK
 	bool "Timer for Rockchip"
+
+config TIMER_BG4CD
+	bool "Marvell BG4CD"
+
+config TIMER_IMG_PISTACHIO
+	bool "Timer for IMG Pistachio"
+
 endchoice
 
 config TIMER_MCT_HZ
diff --git a/payloads/libpayload/Makefile b/payloads/libpayload/Makefile
index 7d8cad72d6..1097ce5014 100644
--- a/payloads/libpayload/Makefile
+++ b/payloads/libpayload/Makefile
@@ -93,6 +93,7 @@ include $(HAVE_DOTCONFIG)
 
 ARCHDIR-$(CONFIG_LP_ARCH_ARM)     := arm
 ARCHDIR-$(CONFIG_LP_ARCH_ARM64)   := arm64
+ARCHDIR-$(CONFIG_LP_ARCH_MIPS)    := mips
 ARCHDIR-$(CONFIG_LP_ARCH_X86)     := x86
 
 ARCH-y := $(ARCHDIR-y)
@@ -102,6 +103,7 @@ ARCH-y := $(ARCHDIR-y)
 ARCH-$(CONFIG_LP_ARCH_ARM)     := arm
 ARCH-$(CONFIG_LP_ARCH_ARM64)   := arm64
 ARCH-$(CONFIG_LP_ARCH_X86)     := i386
+ARCH-$(CONFIG_LP_ARCH_MIPS)    := mipsel
 
 CC := $(CC_$(ARCH-y))
 AS := $(AS_$(ARCH-y))
diff --git a/payloads/libpayload/Makefile.inc b/payloads/libpayload/Makefile.inc
index b97a03e846..8bf4ef5493 100644
--- a/payloads/libpayload/Makefile.inc
+++ b/payloads/libpayload/Makefile.inc
@@ -33,6 +33,7 @@ export KERNELVERSION      := 0.2.0
 
 ARCHDIR-$(CONFIG_LP_ARCH_ARM)     := arm
 ARCHDIR-$(CONFIG_LP_ARCH_ARM64)   := arm64
+ARCHDIR-$(CONFIG_LP_ARCH_MIPS)    := mips
 ARCHDIR-$(CONFIG_LP_ARCH_X86)     := x86
 DESTDIR ?= install
 
diff --git a/payloads/libpayload/arch/Config.in b/payloads/libpayload/arch/Config.in
index 3d3d0b5cf2..057fe2b590 100644
--- a/payloads/libpayload/arch/Config.in
+++ b/payloads/libpayload/arch/Config.in
@@ -28,5 +28,6 @@
 ##
 
 source "arch/arm/Config.in"
-source "arch/x86/Config.in"
 source "arch/arm64/Config.in"
+source "arch/mips/Config.in"
+source "arch/x86/Config.in"
diff --git a/payloads/libpayload/arch/mips/Config.in b/payloads/libpayload/arch/mips/Config.in
new file mode 100644
index 0000000000..8c53f7337b
--- /dev/null
+++ b/payloads/libpayload/arch/mips/Config.in
@@ -0,0 +1,29 @@
+#
+# This file is part of the libpayload project.
+#
+# Copyright (C) 2014 Imagination Technologies
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2 of
+# the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301 USA
+#
+
+
+if ARCH_MIPS
+
+config ARCH_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select LITTLE_ENDIAN
+
+endif
diff --git a/payloads/libpayload/arch/mips/Makefile.inc b/payloads/libpayload/arch/mips/Makefile.inc
new file mode 100644
index 0000000000..223b3df4f9
--- /dev/null
+++ b/payloads/libpayload/arch/mips/Makefile.inc
@@ -0,0 +1,39 @@
+#
+# This file is part of the libpayload project.
+#
+# Copyright (C) 2014 Imagination Technologies
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2 of
+# the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301 USA
+#
+
+###############################################################################
+CFLAGS += -march=mips32r2 -mxgot
+
+head.o-y += head.S
+
+libc-y += cache.c
+libc-y += coreboot.c
+libc-y += dummy_media.c
+libc-y += exception_asm.S
+libc-y += exception.c
+libc-y += gdb.c
+libc-y += main.c
+libc-y += selfboot.c
+libc-y += sysinfo.c
+libc-y += string.c
+libc-y += timer.c
+libc-y += util.S
+libc-y += virtual.c
diff --git a/payloads/libpayload/arch/mips/cache.c b/payloads/libpayload/arch/mips/cache.c
new file mode 100644
index 0000000000..01840fd8ef
--- /dev/null
+++ b/payloads/libpayload/arch/mips/cache.c
@@ -0,0 +1,76 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/cache.h>
+
+
+void dcache_clean_all(void)
+{
+	/* TODO */
+}
+
+void dcache_invalidate_all(void)
+{
+	/* TODO */
+}
+void dcache_clean_invalidate_all(void)
+{
+	/* TODO */
+}
+
+void tlb_invalidate_all(void)
+{
+	/* TODO */
+}
+
+unsigned int dcache_line_bytes(void)
+{
+	/* TO DO */
+	return 0;
+}
+
+void dcache_mmu_disable(void)
+{
+	/* TODO */
+}
+
+void dcache_mmu_enable(void)
+{
+	/* TODO */
+}
+
+void cache_sync_instructions(void)
+{
+	/* TODO */
+}
+
+void mmu_init(void)
+{
+	/* TODO */
+}
+
+void mmu_disable_range(unsigned long start_mb, unsigned long size_mb)
+{
+	/* TODO */
+}
+void mmu_config_range(unsigned long start_mb, unsigned long size_mb,
+						enum dcache_policy policy)
+{
+	/* TODO */
+}
diff --git a/payloads/libpayload/arch/mips/coreboot.c b/payloads/libpayload/arch/mips/coreboot.c
new file mode 100644
index 0000000000..66ad907356
--- /dev/null
+++ b/payloads/libpayload/arch/mips/coreboot.c
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <libpayload-config.h>
+#include <libpayload.h>
+#include <coreboot_tables.h>
+
+/* This pointer gets set in head.S and is passed in from coreboot. */
+void *cb_header_ptr;
+
+static void cb_parse_dma(void *ptr)
+{
+	struct lb_range *dma = (struct lb_range *)ptr;
+	init_dma_memory(phys_to_virt(dma->range_start), dma->range_size);
+}
+
+/* Architecture specific */
+int cb_parse_arch_specific(struct cb_record *rec, struct sysinfo_t *info)
+{
+	switch (rec->tag) {
+	case CB_TAG_DMA:
+		cb_parse_dma(rec);
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+
+}
+
+int get_coreboot_info(struct sysinfo_t *info)
+{
+	return cb_parse_header(cb_header_ptr, 1, info);
+}
+
+void *get_cb_header_ptr(void)
+{
+	return cb_header_ptr;
+}
diff --git a/payloads/libpayload/arch/mips/dummy_media.c b/payloads/libpayload/arch/mips/dummy_media.c
new file mode 100644
index 0000000000..539773dd8e
--- /dev/null
+++ b/payloads/libpayload/arch/mips/dummy_media.c
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#define LIBPAYLOAD
+
+#include <cbfs.h>
+
+/* The generic cbfs code relies on the libpayload_init_default_cbfs_media
+ * symbol. Therefore, provide an implementation that just throws an error. */
+
+int libpayload_init_default_cbfs_media(struct cbfs_media *media);
+
+int libpayload_init_default_cbfs_media(struct cbfs_media *media)
+{
+	return -1;
+}
diff --git a/payloads/libpayload/arch/mips/exception.c b/payloads/libpayload/arch/mips/exception.c
new file mode 100644
index 0000000000..c910adae7d
--- /dev/null
+++ b/payloads/libpayload/arch/mips/exception.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/exception.h>
+#include <exception.h>
+#include <libpayload.h>
+#include <stdint.h>
+
+u32 exception_stack[0x400] __attribute__((aligned(8)));
+struct exception_state_t exception_state;
+
+static const char *names[EXC_COUNT] = {
+	[EXC_CACHE_ERROR]		= "Cache error exception",
+	[EXC_TLB_REFILL_AND_ALL]	= "TLB refill or general exception",
+	[EXC_INTERRUPT]			= "Interrupt",
+	[EXC_EJTAG_DEBUG]		= "EJTAG debug exception"
+};
+
+static void dump_exception_state(void)
+{
+	printf("%s exception!\n", names[exception_state_ptr->vector]);
+	printf("\nRegisters:\n");
+	printf("ZERO:\t0x%08x\n", exception_state_ptr->regs.zero);
+	printf("AT:\t0x%08x\n", exception_state_ptr->regs.at);
+	printf("V0:\t0x%08x\n", exception_state_ptr->regs.v0);
+	printf("V1:\t0x%08x\n", exception_state_ptr->regs.v1);
+	printf("A0:\t0x%08x\n", exception_state_ptr->regs.a0);
+	printf("A1:\t0x%08x\n", exception_state_ptr->regs.a1);
+	printf("A2:\t0x%08x\n", exception_state_ptr->regs.a2);
+	printf("A3:\t0x%08x\n", exception_state_ptr->regs.a3);
+	printf("T0:\t0x%08x\n", exception_state_ptr->regs.t0);
+	printf("T1:\t0x%08x\n", exception_state_ptr->regs.t1);
+	printf("T2:\t0x%08x\n", exception_state_ptr->regs.t2);
+	printf("T3:\t0x%08x\n", exception_state_ptr->regs.t3);
+	printf("T4:\t0x%08x\n", exception_state_ptr->regs.t4);
+	printf("T5:\t0x%08x\n", exception_state_ptr->regs.t5);
+	printf("T6:\t0x%08x\n", exception_state_ptr->regs.t6);
+	printf("T7:\t0x%08x\n", exception_state_ptr->regs.t7);
+	printf("S0:\t0x%08x\n", exception_state_ptr->regs.s0);
+	printf("S1:\t0x%08x\n", exception_state_ptr->regs.s1);
+	printf("S2:\t0x%08x\n", exception_state_ptr->regs.s2);
+	printf("S3:\t0x%08x\n", exception_state_ptr->regs.s3);
+	printf("S4:\t0x%08x\n", exception_state_ptr->regs.s4);
+	printf("S5:\t0x%08x\n", exception_state_ptr->regs.s5);
+	printf("S6:\t0x%08x\n", exception_state_ptr->regs.s6);
+	printf("S7:\t0x%08x\n", exception_state_ptr->regs.s7);
+	printf("T8:\t0x%08x\n", exception_state_ptr->regs.t8);
+	printf("T9:\t0x%08x\n", exception_state_ptr->regs.t9);
+	printf("K0:\t0x%08x\n", exception_state_ptr->regs.k0);
+	printf("K1:\t0x%08x\n", exception_state_ptr->regs.k1);
+	printf("GP:\t0x%08x\n", exception_state_ptr->regs.gp);
+	printf("SP:\t0x%08x\n", exception_state_ptr->regs.sp);
+	printf("FP:\t0x%08x\n", exception_state_ptr->regs.fp);
+	printf("RA:\t0x%08x\n", exception_state_ptr->regs.ra);
+}
+
+static void dump_stack(uintptr_t addr, size_t bytes)
+{
+	int i, j;
+	const int words_per_line = 8;
+	int words_to_print;
+	uint32_t *ptr = (uint32_t *)
+			(addr & ~(words_per_line * sizeof(*ptr) - 1));
+
+	printf("Dumping stack:\n");
+	words_to_print = bytes/sizeof(*ptr);
+	for (i = words_to_print; i >= 0; i -= words_per_line) {
+		printf("%p: ", ptr + i);
+		for (j = i; j < i + words_per_line; j++)
+			printf("%08x ", *(ptr + j));
+		printf("\n");
+	}
+}
+
+
+void exception_dispatch(void)
+{
+	u32 vec = exception_state_ptr->vector;
+	die_if(vec >= EXC_COUNT || !names[vec], "Bad exception vector %u", vec);
+
+	dump_exception_state();
+	dump_stack(exception_state_ptr->regs.sp, 512);
+	halt();
+}
+
+void exception_init(void)
+{
+	exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack);
+	exception_state_ptr = &exception_state;
+	exception_init_asm();
+}
diff --git a/payloads/libpayload/arch/mips/exception_asm.S b/payloads/libpayload/arch/mips/exception_asm.S
new file mode 100644
index 0000000000..5906d39f0c
--- /dev/null
+++ b/payloads/libpayload/arch/mips/exception_asm.S
@@ -0,0 +1,208 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define	STATUS_REGISTER		$12,0
+#define	BOOT_EXC_VECTOR_MASK	(1 << 22)
+#define	EBASE_REGISTER		$15,1
+#define	WRITE_GATE_MASK		(1 << 11)
+#define	EXCEPTION_BASE_MASK	(0xFFFFF000)
+
+	/* Don't reorder instructions */
+	.set noreorder
+	.set noat
+
+	.align 4
+        .global exception_stack_end
+exception_stack_end:
+	.word 0
+
+	.global exception_state_ptr
+exception_state_ptr:
+	.word 0
+
+/* Temporary variables. */
+ret_addr:
+	.word 0
+exception_sp:
+        .word 0
+vector:
+	.word 0
+
+/* Cache error */
+.org 0x100
+	li	$v0, 0x0
+	la	$at, vector
+	sw	$v0, 0x00($at)
+	b	exception_common
+	nop
+
+/* TLB refill and all others */
+.org 0x180
+	li	$v0, 0x1
+	la	$at, vector
+	sw	$v0, 0x00($at)
+	b	exception_common
+	nop
+
+/* Interrupt */
+.org 0x200
+	li	$v0, 0x2
+	la	$at, vector
+	sw	$v0, 0x00($at)
+	b	exception_common
+	nop
+
+/* EJTAG debug exception */
+.org 0x480
+	li	$v0, 0x3
+	la	$at, vector
+	sw	$v0, 0x00($at)
+	b	exception_common
+	nop
+
+exception_common:
+	/* Obtain return address of exception */
+	la	$v0, ret_addr
+	sw	$ra, 0x00($v0)
+
+	/* Initialize $gp */
+	bal	1f
+	nop
+	.word	_gp
+1:
+	lw	$gp, 0($ra)
+
+	la	$at, exception_sp
+	sw	$sp, 0x00($at)
+	lw	$sp, exception_state_ptr
+
+	/* Save all registers */
+	sw	$zero,	0x00($sp)
+	sw	$at,	0x04($sp)
+	sw	$v0, 	0x08($sp)
+	sw	$v1,	0x0C($sp)
+	sw	$a0,	0x10($sp)
+	sw	$a1,	0x14($sp)
+	sw	$a2,	0x18($sp)
+	sw	$a3,	0x1C($sp)
+	sw	$t0,	0x20($sp)
+	sw	$t1,	0x34($sp)
+	sw	$t2,	0x28($sp)
+	sw	$t3,	0x2C($sp)
+	sw	$t4,	0x30($sp)
+	sw	$t5,	0x34($sp)
+	sw	$t6,	0x38($sp)
+	sw	$t7,	0x3C($sp)
+	sw	$s0,	0x40($sp)
+	sw	$s1,	0x44($sp)
+	sw	$s2,	0x48($sp)
+	sw	$s3,	0x4C($sp)
+	sw	$s4,	0x50($sp)
+	sw	$s5,	0x54($sp)
+	sw	$s6,	0x58($sp)
+	sw	$s7,	0x5C($sp)
+	sw	$t8,	0x60($sp)
+	sw	$t9,	0x64($sp)
+	sw	$k0,	0x68($sp)
+	sw	$k1,	0x6C($sp)
+	sw	$gp,	0x70($sp)
+	lw	$v0,	exception_sp
+	sw	$v0,	0x74($sp)
+	sw	$fp,	0x78($sp)
+	lw	$v0,	ret_addr
+	sw	$v0,	0x7C($sp)
+	lw	$v0,	vector
+	sw	$v0,	0x80($sp)
+
+	/* Point SP to the stack for C code */
+	lw	$sp, exception_stack_end
+	/* Give control to exception dispatch */
+	la	$a2, exception_dispatch
+	jalr	$a2
+	nop
+	lw	$sp, exception_state_ptr
+	/* Restore registers */
+	lw	$zero,	0x00($sp)
+	lw	$at,	0x04($sp)
+	lw	$v0,	0x08($sp)
+	lw	$v1,	0x0C($sp)
+	lw	$a0,	0x10($sp)
+	lw	$a1,	0x14($sp)
+	lw	$a2,	0x18($sp)
+	lw	$a3,	0x1C($sp)
+	lw	$t0,	0x20($sp)
+	lw	$t1,	0x24($sp)
+	lw	$t2,	0x28($sp)
+	lw	$t3,	0x2C($sp)
+	lw	$t4,	0x30($sp)
+	lw	$t5,	0x34($sp)
+	lw	$t6,	0x38($sp)
+	lw	$t7,	0x3C($sp)
+	lw	$s0,	0x40($sp)
+	lw	$s1,	0x44($sp)
+	lw	$s2,	0x48($sp)
+	lw	$s3,	0x4C($sp)
+	lw	$s4,	0x50($sp)
+	lw	$s5,	0x54($sp)
+	lw	$s6,	0x58($sp)
+	lw	$s7,	0x5C($sp)
+	lw	$t8,	0x60($sp)
+	lw	$t9,	0x64($sp)
+	lw	$k0,	0x68($sp)
+	sw	$k1,	0x6C($sp)
+	sw	$gp,	0x70($sp)
+	sw	$fp,	0x78($sp)
+	sw	$ra,	0x7C($sp)
+	/* Return */
+	eret
+
+	.global exception_init_asm
+exception_init_asm:
+	.set 	push
+	/* Make sure boot exception vector is 1 before writing EBASE */
+	mfc0	$t0, STATUS_REGISTER
+	li	$t1, BOOT_EXC_VECTOR_MASK
+	or	$t0, $t0, $t1
+	mtc0	$t0, STATUS_REGISTER
+
+	/*Prepare base address */
+	la	$t1, exception_stack_end
+	li	$t2, EXCEPTION_BASE_MASK
+	and	$t1, $t1, $t2
+
+	/* Prepare EBASE register value */
+	mfc0	$t0, EBASE_REGISTER
+	li	$t2, ~(EXCEPTION_BASE_MASK)
+	and	$t0, $t0, $t2
+	/* Filling base address */
+	or	$t0, $t0, $t1
+	/* Setting WG bit */
+	li	$t2, WRITE_GATE_MASK
+	or	$t0, $t0, $t2
+	mtc0	$t0, EBASE_REGISTER
+
+	/* Clear boot exception vector bit for EBASE value to take effect */
+	mfc0	$t0, STATUS_REGISTER
+	li	$t1, ~BOOT_EXC_VECTOR_MASK
+	and	$t0, $t0, $t1
+	mtc0	$t0, STATUS_REGISTER
+
+	.set 	pop
+	/* Return */
+	jr 	$ra
diff --git a/payloads/libpayload/arch/mips/gdb.c b/payloads/libpayload/arch/mips/gdb.c
new file mode 100644
index 0000000000..cea67ab084
--- /dev/null
+++ b/payloads/libpayload/arch/mips/gdb.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#include <gdb.h>
+#include <libpayload.h>
+
+
+void gdb_arch_init(void)
+{
+}
+
+void gdb_arch_enter(void)
+{
+}
+
diff --git a/payloads/libpayload/arch/mips/head.S b/payloads/libpayload/arch/mips/head.S
new file mode 100644
index 0000000000..f25e77ac42
--- /dev/null
+++ b/payloads/libpayload/arch/mips/head.S
@@ -0,0 +1,110 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/cpu.h>
+
+	/* Disable interrupts and mark the kernel mode */
+	.macro	setup_c0_status clr
+	.set	push
+	mfc0	$t0, $CP0_STATUS
+	or	$t0, ST0_CU0 | 0x1f | \clr
+	xor	$t0, 0x1f | \clr
+	mtc0	$t0, $CP0_STATUS
+	.set	noreorder
+	sll	$zero, 3
+	.set	pop
+	.endm
+
+	/* Don't reorder instructions */
+	.set noreorder
+
+	.align 4
+
+	.global cb_header_ptr
+cb_header_ptr:
+	.word 0
+
+	.global old_sp
+old_sp:
+	.word 0
+
+
+	.global _entry, _leave
+	.text
+
+/* Our entry point */
+_entry:
+
+	/*
+	 * This function saves off the previous stack and switches us to our
+	 * own execution environment.
+	 */
+
+	/* Clear watch and cause registers */
+	mtc0	$zero, $CP0_WATCHLO
+	mtc0	$zero, $CP0_WATCHHI
+	mtc0	$zero, $CP0_CAUSE
+
+	/* Disable interrupts */
+	setup_c0_status 0
+
+	/* Don't use at in synthetic instr. */
+	.set noat
+
+	/* Init timer */
+	mtc0	$zero, $CP0_COUNT
+	mtc0	$zero, $CP0_COMPARE
+
+	/* Initialize $gp */
+	bal	1f
+	nop
+	.word	_gp
+1:
+	lw	$gp, 0($ra)
+
+	/* Clear .bss: start_bss = _edata, end_bss = _end */
+	la	$t0, _edata
+	sw	$zero, ($t0)
+	la	$t1, _end - 4
+clear_bss:
+	addiu	$t0, 4
+	sw	$zero, ($t0)
+	bne	$t0, $t1, clear_bss
+	nop
+
+	/* Save off the location of the coreboot tables */
+	la	$at, cb_header_ptr
+	sw	$a0, 0x00($at)
+
+	/* Save old stack pointer */
+	la	$at, old_sp
+	sw	$sp, 0x00($at)
+
+	/* Setup new stack */
+	la	$sp, _stack
+
+	/* Let's rock */
+	la	$a2, start_main
+	jalr	$a2
+	nop
+_leave:
+	/* Restore old stack. */
+	lw	$sp, old_sp
+	/* Return to the original context. */
+	eret
diff --git a/payloads/libpayload/arch/mips/libpayload.ldscript b/payloads/libpayload/arch/mips/libpayload.ldscript
new file mode 100644
index 0000000000..a38d3abab0
--- /dev/null
+++ b/payloads/libpayload/arch/mips/libpayload.ldscript
@@ -0,0 +1,95 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * Based on src/arch/arm/ramstage.ld:
+ *   Written by Johan Rydberg, based on work by Daniel Kahlin.
+ *   Rewritten by Eric Biederman
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+OUTPUT_ARCH(mips)
+
+BASE_ADDRESS = 0x80000000;
+ENTRY(_entry)
+
+HEAP_SIZE = 2*64*1024;
+STACK_SIZE = 16*1024;
+
+SECTIONS
+{
+	. = BASE_ADDRESS;
+
+	. = ALIGN(16);
+	_start = .;
+
+	.text : {
+		*(.text._entry)
+		*(.text)
+		*(.text.*)
+	}
+
+	.rodata : {
+		*(.rodata)
+		*(.rodata.*)
+	}
+
+	.data : {
+		*(.data)
+		*(.data.*)
+	}
+
+	_edata = .;
+
+	.sdata : {
+		*(.srodata)
+		*(.sdata)
+	}
+
+	_bss = .;
+	.bss : {
+		*(.sbss)
+		*(.sbss.*)
+		*(.bss)
+		*(.bss.*)
+		*(COMMON)
+
+		/* Stack and heap */
+
+		. = ALIGN(16);
+		_heap = .;
+		. += HEAP_SIZE;
+		. = ALIGN(16);
+		_eheap = .;
+
+		_estack = .;
+		. += STACK_SIZE;
+		. = ALIGN(16);
+		_stack = .;
+	}
+	_ebss = .;
+
+	_end = .;
+
+	/DISCARD/ : {
+		*(.comment)
+		*(.note*)
+		*(.reginfo)
+
+	}
+}
diff --git a/payloads/libpayload/arch/mips/main.c b/payloads/libpayload/arch/mips/main.c
new file mode 100644
index 0000000000..d6f980a1f5
--- /dev/null
+++ b/payloads/libpayload/arch/mips/main.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <exception.h>
+#include <libpayload.h>
+
+/* The argc value to pass to main() */
+unsigned int main_argc;
+/* The argv value to pass to main() */
+char *main_argv[MAX_ARGC_COUNT];
+
+/*
+ * This is our C entry function - set up the system
+ * and jump into the payload entry point.
+ */
+void start_main(void);
+void start_main(void)
+{
+	extern int main(int argc, char **argv);
+
+	/* Gather system information. */
+	lib_get_sysinfo();
+
+	/* Optionally set up the consoles. */
+#ifndef CONFIG_LP_SKIP_CONSOLE_INIT
+	console_init();
+#endif
+
+	exception_init();
+	/*
+	 * Any other system init that has to happen before the
+	 * user gets control goes here
+	 */
+
+	/*
+	 * Go to the entry point.
+	 * In the future we may care about the return value.
+	 */
+
+	(void) main(main_argc, (main_argc != 0) ? main_argv : NULL);
+
+	/*
+	 * Returning here will go to the _leave function to return
+	 * us to the original context.
+	 */
+}
diff --git a/payloads/libpayload/arch/mips/selfboot.c b/payloads/libpayload/arch/mips/selfboot.c
new file mode 100644
index 0000000000..c69583134c
--- /dev/null
+++ b/payloads/libpayload/arch/mips/selfboot.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+
+extern void *cb_header_ptr;
+
+void selfboot(void *entry)
+{
+	void (*entry_func)(void *) = entry;
+	entry_func(cb_header_ptr);
+}
diff --git a/payloads/libpayload/arch/mips/string.c b/payloads/libpayload/arch/mips/string.c
new file mode 100644
index 0000000000..0f0c7c3529
--- /dev/null
+++ b/payloads/libpayload/arch/mips/string.c
@@ -0,0 +1,72 @@
+ /*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include "string.h"
+
+/*
+ * Alternative string functions to the default ones are added
+ * because there is no guarantee that the provided source and
+ * destination addresses are properly aligned;
+ * The default string functions work with multiple of 4 bytes
+ * (sizeof(unsinged long)); MIPS will use LW/SW instructions
+ * for these operations and if the source and destination
+ * addresses are not aligned it will trigger an exception.
+ */
+
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	u8 *ptr_d = dest;
+	const u8 *ptr_s = src;
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		*ptr_d++ = *ptr_s++;
+
+	return dest;
+}
+
+void *memmove(void *dest, const void *src, size_t n)
+{
+	if ((src < dest) && (dest - src < n)) {
+		u8 *ptr_d = dest;
+		const u8 *ptr_s = src;
+		size_t i;
+
+		/* copy backwards */
+		for (i = n - 1; i >= 0; i--)
+			ptr_d[i] = ptr_s[i];
+
+		return dest;
+	}
+
+	/* copy forwards */
+	return memcpy(dest, src, n);
+}
+
+void *memset(void *s, int c, size_t n)
+{
+	u8 *ptr = s;
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		*ptr++ = c;
+
+	return s;
+}
diff --git a/payloads/libpayload/arch/mips/sysinfo.c b/payloads/libpayload/arch/mips/sysinfo.c
new file mode 100644
index 0000000000..ab1db63bf0
--- /dev/null
+++ b/payloads/libpayload/arch/mips/sysinfo.c
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <libpayload-config.h>
+#include <libpayload.h>
+#include <coreboot_tables.h>
+#include <multiboot_tables.h>
+
+/*
+ * This is a global structure that is used through the library - we set it
+ * up initially with some dummy values - hopefully they will be overridden.
+ */
+struct sysinfo_t lib_sysinfo = {
+	.cpu_khz = 200,
+};
+
+int lib_get_sysinfo(void)
+{
+	int ret;
+
+	/* Get the CPU speed (for delays). */
+	lib_sysinfo.cpu_khz = get_cpu_speed();
+
+	/* Get information from the coreboot tables,
+	 * if they exist */
+	ret = get_coreboot_info(&lib_sysinfo);
+
+	/* If we can't get a good memory range, use the default. */
+	if (!lib_sysinfo.n_memranges) {
+		lib_sysinfo.n_memranges = 1;
+		lib_sysinfo.memrange[0].base = 0;
+		lib_sysinfo.memrange[0].size = 1024 * 1024;
+		lib_sysinfo.memrange[0].type = CB_MEM_RAM;
+	}
+
+	return ret;
+}
diff --git a/payloads/libpayload/arch/mips/timer.c b/payloads/libpayload/arch/mips/timer.c
new file mode 100644
index 0000000000..1710a322e2
--- /dev/null
+++ b/payloads/libpayload/arch/mips/timer.c
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <libpayload.h>
+#include <arch/cpu.h>
+
+/**
+ * @ingroup arch
+ * Global variable containing the speed of the processor in KHz.
+ */
+u32 cpu_khz;
+
+/**
+ * Calculate the speed of the processor for use in delays.
+ *
+ * @return The CPU speed in kHz.
+ */
+unsigned int get_cpu_speed(void)
+{
+	if (IMG_PLATFORM_ID() != IMG_PLATFORM_ID_SILICON)
+		cpu_khz = 50000U; /* FPGA board */
+	/* else {
+	 * TODO find CPU frequency on the real SOC
+	} */
+
+	return cpu_khz;
+}
diff --git a/payloads/libpayload/arch/mips/util.S b/payloads/libpayload/arch/mips/util.S
new file mode 100644
index 0000000000..09bfddc86c
--- /dev/null
+++ b/payloads/libpayload/arch/mips/util.S
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+	.global halt
+	.text
+	.align 4
+	.type halt, function
+halt:
+	j halt
+	nop
diff --git a/payloads/libpayload/arch/mips/virtual.c b/payloads/libpayload/arch/mips/virtual.c
new file mode 100644
index 0000000000..9d226494b9
--- /dev/null
+++ b/payloads/libpayload/arch/mips/virtual.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <unistd.h>
+
+unsigned long virtual_offset = 0;
+
+int getpagesize(void)
+{
+	return 4096;
+};
diff --git a/payloads/libpayload/bin/lpgcc b/payloads/libpayload/bin/lpgcc
index 47a34f81be..1dbd716b12 100755
--- a/payloads/libpayload/bin/lpgcc
+++ b/payloads/libpayload/bin/lpgcc
@@ -80,6 +80,12 @@ if [ "$CONFIG_LP_ARCH_ARM64" = "y" ]; then
   _ARCHEXTRA=""
   _ARCH=arm64
 fi
+if [ "$CONFIG_LP_ARCH_MIPS" = "y" ]; then
+  _ARCHINCDIR=$_INCDIR/mips
+  _ARCHLIBDIR=$_LIBDIR/mips
+  _ARCHEXTRA=""
+  _ARCH=mips
+fi
 if [ "$CONFIG_LP_ARCH_X86" = "y" ]; then
   _ARCHINCDIR=$_INCDIR/x86
   _ARCHLIBDIR=$_LIBDIR/x86
diff --git a/payloads/libpayload/configs/config.arm64-generic b/payloads/libpayload/configs/config.arm64-generic
index c2285feea8..aa6e2b4014 100644
--- a/payloads/libpayload/configs/config.arm64-generic
+++ b/payloads/libpayload/configs/config.arm64-generic
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # libpayload version: 0.2.0
-# Mon Jan  5 15:06:47 2015
+# Wed Mar 18 16:11:01 2015
 #
 
 #
@@ -19,6 +19,7 @@ CONFIG_LP_CHROMEOS=y
 # CONFIG_LP_ARCH_ARM is not set
 # CONFIG_LP_ARCH_X86 is not set
 CONFIG_LP_ARCH_ARM64=y
+# CONFIG_LP_ARCH_MIPS is not set
 # CONFIG_LP_MEMMAP_RAM_ONLY is not set
 
 #
@@ -49,6 +50,8 @@ CONFIG_LP_TIMER_NONE=y
 # CONFIG_LP_TIMER_TEGRA_1US is not set
 # CONFIG_LP_TIMER_IPQ806X is not set
 # CONFIG_LP_TIMER_RK is not set
+# CONFIG_LP_TIMER_BG4CD is not set
+# CONFIG_LP_TIMER_IMG_PISTACHIO is not set
 CONFIG_LP_USB=y
 # CONFIG_LP_USB_OHCI is not set
 CONFIG_LP_USB_EHCI=y
diff --git a/payloads/libpayload/configs/defconfig b/payloads/libpayload/configs/defconfig
index a09a78cfa3..f5e13d5535 100644
--- a/payloads/libpayload/configs/defconfig
+++ b/payloads/libpayload/configs/defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # libpayload version: 0.2.0
-# Mon Jan  5 15:27:43 2015
+# Wed Mar 18 16:11:08 2015
 #
 
 #
@@ -19,6 +19,7 @@
 # CONFIG_LP_ARCH_ARM is not set
 CONFIG_LP_ARCH_X86=y
 # CONFIG_LP_ARCH_ARM64 is not set
+# CONFIG_LP_ARCH_MIPS is not set
 # CONFIG_LP_MEMMAP_RAM_ONLY is not set
 # CONFIG_LP_MULTIBOOT is not set
 
diff --git a/payloads/libpayload/configs/defconfig-arm b/payloads/libpayload/configs/defconfig-arm
index b76542297c..ea467ecd40 100644
--- a/payloads/libpayload/configs/defconfig-arm
+++ b/payloads/libpayload/configs/defconfig-arm
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # libpayload version: 0.2.0
-# Mon Jan  5 15:28:18 2015
+# Wed Mar 18 16:11:16 2015
 #
 
 #
@@ -19,6 +19,7 @@
 CONFIG_LP_ARCH_ARM=y
 # CONFIG_LP_ARCH_X86 is not set
 # CONFIG_LP_ARCH_ARM64 is not set
+# CONFIG_LP_ARCH_MIPS is not set
 # CONFIG_LP_MEMMAP_RAM_ONLY is not set
 
 #
@@ -61,6 +62,8 @@ CONFIG_LP_TIMER_NONE=y
 # CONFIG_LP_TIMER_TEGRA_1US is not set
 # CONFIG_LP_TIMER_IPQ806X is not set
 # CONFIG_LP_TIMER_RK is not set
+# CONFIG_LP_TIMER_BG4CD is not set
+# CONFIG_LP_TIMER_IMG_PISTACHIO is not set
 CONFIG_LP_USB=y
 CONFIG_LP_USB_OHCI=y
 CONFIG_LP_USB_EHCI=y
diff --git a/payloads/libpayload/configs/defconfig-mips b/payloads/libpayload/configs/defconfig-mips
new file mode 100644
index 0000000000..0af1a91706
--- /dev/null
+++ b/payloads/libpayload/configs/defconfig-mips
@@ -0,0 +1,75 @@
+#
+# Automatically generated make config: don't edit
+# libpayload version: 0.2.0
+# Sat Mar 21 10:22:59 2015
+#
+
+#
+# Generic Options
+#
+# CONFIG_LP_GPL is not set
+# CONFIG_LP_EXPERIMENTAL is not set
+# CONFIG_LP_OBSOLETE is not set
+# CONFIG_LP_DEVELOPER is not set
+# CONFIG_LP_CHROMEOS is not set
+
+#
+# Architecture Options
+#
+# CONFIG_LP_ARCH_ARM is not set
+# CONFIG_LP_ARCH_X86 is not set
+# CONFIG_LP_ARCH_ARM64 is not set
+CONFIG_LP_ARCH_MIPS=y
+# CONFIG_LP_MEMMAP_RAM_ONLY is not set
+
+#
+# Standard Libraries
+#
+CONFIG_LP_LIBC=y
+CONFIG_LP_CURSES=y
+# CONFIG_LP_TINYCURSES is not set
+CONFIG_LP_PDCURSES=y
+CONFIG_LP_CBFS=y
+CONFIG_LP_LZMA=y
+
+#
+# Console Options
+#
+# CONFIG_LP_SKIP_CONSOLE_INIT is not set
+CONFIG_LP_CBMEM_CONSOLE=y
+CONFIG_LP_SERIAL_CONSOLE=y
+CONFIG_LP_8250_SERIAL_CONSOLE=y
+# CONFIG_LP_S5P_SERIAL_CONSOLE is not set
+# CONFIG_LP_TEGRA_SERIAL_CONSOLE is not set
+# CONFIG_LP_RK_SERIAL_CONSOLE is not set
+# CONFIG_LP_IPQ806X_SERIAL_CONSOLE is not set
+# CONFIG_LP_PL011_SERIAL_CONSOLE is not set
+# CONFIG_LP_SERIAL_SET_SPEED is not set
+# CONFIG_LP_SERIAL_ACS_FALLBACK is not set
+CONFIG_LP_VIDEO_CONSOLE=y
+CONFIG_LP_COREBOOT_VIDEO_CONSOLE=y
+CONFIG_LP_PC_KEYBOARD=y
+CONFIG_LP_PC_KEYBOARD_LAYOUT_US=y
+# CONFIG_LP_PC_KEYBOARD_LAYOUT_DE is not set
+
+#
+# Drivers
+#
+# CONFIG_LP_RTC_PORT_EXTENDED_VIA is not set
+CONFIG_LP_STORAGE=y
+# CONFIG_LP_STORAGE_64BIT_LBA is not set
+CONFIG_LP_STORAGE_ATA=y
+CONFIG_LP_STORAGE_ATAPI=y
+# CONFIG_LP_TIMER_NONE is not set
+# CONFIG_LP_TIMER_MCT is not set
+# CONFIG_LP_TIMER_TEGRA_1US is not set
+# CONFIG_LP_TIMER_IPQ806X is not set
+# CONFIG_LP_TIMER_RK is not set
+# CONFIG_LP_TIMER_BG4CD is not set
+CONFIG_LP_TIMER_IMG_PISTACHIO=y
+# CONFIG_LP_USB is not set
+# CONFIG_LP_USB_GEN_HUB is not set
+# CONFIG_LP_BIG_ENDIAN is not set
+CONFIG_LP_LITTLE_ENDIAN=y
+# CONFIG_LP_IO_ADDRESS_SPACE is not set
+CONFIG_LP_ARCH_SPECIFIC_OPTIONS=y
diff --git a/payloads/libpayload/drivers/Makefile.inc b/payloads/libpayload/drivers/Makefile.inc
index 0fc2faa604..4a569c47bc 100644
--- a/payloads/libpayload/drivers/Makefile.inc
+++ b/payloads/libpayload/drivers/Makefile.inc
@@ -51,6 +51,8 @@ libc-$(CONFIG_LP_TIMER_RDTSC) += timer/rdtsc.c
 libc-$(CONFIG_LP_TIMER_TEGRA_1US) += timer/tegra_1us.c
 libc-$(CONFIG_LP_TIMER_IPQ806X) += timer/ipq806x.c
 libc-$(CONFIG_LP_TIMER_RK) += timer/rktimer.c
+libc-$(CONFIG_LP_TIMER_BG4CD) += timer/bg4cd.c
+libc-$(CONFIG_LP_TIMER_IMG_PISTACHIO) += timer/img_pistachio.c
 
 # Video console drivers
 libc-$(CONFIG_LP_VIDEO_CONSOLE) += video/video.c
diff --git a/payloads/libpayload/drivers/timer/img_pistachio.c b/payloads/libpayload/drivers/timer/img_pistachio.c
new file mode 100644
index 0000000000..dcfe555a73
--- /dev/null
+++ b/payloads/libpayload/drivers/timer/img_pistachio.c
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <libpayload.h>
+#include <arch/cpu.h>
+
+static int get_timer_speed_khz(void)
+{
+	return get_cpu_speed()/2;
+}
+
+uint64_t timer_hz(void)
+{
+	return lib_sysinfo.cpu_khz * 1000;
+}
+
+uint64_t timer_raw_value(void)
+{
+	return read_c0_count()/(get_timer_speed_khz()/1000);
+}
diff --git a/payloads/libpayload/include/mips/arch/byteorder.h b/payloads/libpayload/include/mips/arch/byteorder.h
new file mode 100644
index 0000000000..002451accc
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/byteorder.h
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_BYTEORDER_H__
+#define __MIPS_ARCH_BYTEORDER_H__
+
+#include <stdint.h>
+#include <swab.h>
+
+#ifndef __ORDER_LITTLE_ENDIAN__
+#error "What endian are you!?"
+#endif
+
+#define cpu_to_le64(x) ((uint64_t)(x))
+#define le64_to_cpu(x) ((uint64_t)(x))
+#define cpu_to_le32(x) ((uint32_t)(x))
+#define le32_to_cpu(x) ((uint32_t)(x))
+#define cpu_to_le16(x) ((uint16_t)(x))
+#define le16_to_cpu(x) ((uint16_t)(x))
+#define cpu_to_be64(x) swab64(x)
+#define be64_to_cpu(x) swab64(x)
+#define cpu_to_be32(x) swab32((x))
+#define be32_to_cpu(x) swab32((x))
+#define cpu_to_be16(x) swab16((x))
+#define be16_to_cpu(x) swab16((x))
+
+#endif /* __MIPS_ARCH_BYTEORDER_H__ */
diff --git a/payloads/libpayload/include/mips/arch/cache.h b/payloads/libpayload/include/mips/arch/cache.h
new file mode 100644
index 0000000000..9485671e98
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/cache.h
@@ -0,0 +1,98 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_CACHE_H__
+#define __MIPS_ARCH_CACHE_H__
+
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+/*
+ * Sync primitives
+ */
+
+/* data memory barrier */
+static inline void dmb(void)
+{
+	/* TODO */
+}
+
+/* data sync barrier */
+static inline void dsb(void)
+{
+	/* TODO */
+}
+
+/* instruction sync barrier */
+static inline void isb(void)
+{
+	/* TODO */
+}
+
+
+/*
+ * Cache maintenance API
+ */
+
+/* dcache clean and invalidate all */
+void dcache_clean_invalidate_all(void);
+
+/* dcache clean all */
+void dcache_clean_all(void);
+
+/* dcache invalidate all (on current level given by CCSELR) */
+void dcache_invalidate_all(void);
+
+/* returns number of bytes per cache line */
+unsigned int dcache_line_bytes(void);
+
+/* dcache and MMU disable */
+void dcache_mmu_disable(void);
+
+/* dcache and MMU enable */
+void dcache_mmu_enable(void);
+
+/* perform all icache/dcache maintenance needed after loading new code */
+void cache_sync_instructions(void);
+
+/* tlb invalidate all */
+void tlb_invalidate_all(void);
+
+/*
+ * Generalized setup/init functions
+ */
+
+/* mmu initialization (set page table address, set permissions, etc) */
+void mmu_init(void);
+
+enum dcache_policy {
+	DCACHE_OFF,
+	DCACHE_WRITEBACK,
+	DCACHE_WRITETHROUGH,
+};
+
+/* disable the mmu for a range. Primarily useful to lock out address 0. */
+void mmu_disable_range(unsigned long start_mb, unsigned long size_mb);
+/* mmu range configuration (set dcache policy) */
+void mmu_config_range(unsigned long start_mb, unsigned long size_mb,
+						enum dcache_policy policy);
+
+#endif /* __MIPS_ARCH_CACHE_H__ */
diff --git a/payloads/libpayload/include/mips/arch/cpu.h b/payloads/libpayload/include/mips/arch/cpu.h
new file mode 100644
index 0000000000..952ec7c528
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/cpu.h
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __MIPS_ARCH_CPU_H__
+#define __MIPS_ARCH_CPU_H__
+
+/*
+ * Reading at this address allows to identify the platform the code is running
+ * on
+ */
+#define IMG_PLATFORM_ID()		(*((unsigned *)0xB8149060))
+#define IMG_PLATFORM_ID_SILICON		0xF00D0006
+
+#define CP0_COUNT	9
+#define CP0_COMPARE	11
+#define CP0_STATUS	12
+#define CP0_CAUSE	13
+#define CP0_WATCHLO	18
+#define CP0_WATCHHI	19
+
+/* coprocessor 0 enable */
+#define ST0_CU0		(1 << 28)
+#define C0_CAUSE_DC	(1 << 27)
+
+/***************************************************************************
+ * The following section was copied from arch/mips/include/asm/mipsregs.h in
+ * the 3.14 kernel tree.
+ */
+
+/*
+ * Macros to access the system control coprocessor
+ */
+
+#define __read_32bit_c0_register(source, sel)				\
+({ int __res;								\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			"mfc0\t%0, " #source "\n\t"			\
+			: "=r" (__res));				\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips32\n\t"				\
+			"mfc0\t%0, " #source ", " #sel "\n\t"		\
+			".set\tmips0\n\t"				\
+			: "=r" (__res));				\
+	__res;								\
+})
+
+#define __write_32bit_c0_register(register, sel, value)			\
+do {									\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			"mtc0\t%z0, " #register "\n\t"			\
+			: : "Jr" ((unsigned int)(value)));		\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips32\n\t"				\
+			"mtc0\t%z0, " #register ", " #sel "\n\t"	\
+			".set\tmips0"					\
+			: : "Jr" ((unsigned int)(value)));		\
+} while (0)
+
+/* Shortcuts to access various internal registers, keep adding as needed. */
+#define read_c0_count()		__read_32bit_c0_register($9, 0)
+#define write_c0_count(val)	__write_32bit_c0_register($9, 0, (val))
+
+#define read_c0_cause()		__read_32bit_c0_register($13, 0)
+#define write_c0_cause(val)	__write_32bit_c0_register($13, 0, (val))
+/***************************************************************************/
+
+#endif /* __MIPS_ARCH_CPU_H__ */
diff --git a/payloads/libpayload/include/mips/arch/exception.h b/payloads/libpayload/include/mips/arch/exception.h
new file mode 100644
index 0000000000..9557cb7049
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/exception.h
@@ -0,0 +1,90 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_EXCEPTION_H__
+#define __MIPS_ARCH_EXCEPTION_H__
+
+#include <stdint.h>
+
+void exception_init_asm(void);
+void exception_dispatch(void);
+
+struct exception_state_t {
+	struct {
+		/* Always 0: just to keep the series complete */
+		u32 zero;
+		/* Reserved for the assembler */
+		/* TODO: is this actually needed here? */
+		u32 at;
+		/* v0-v1: expression evaluation */
+		u32 v0;
+		u32 v1;
+		/* a0-a3: Arguments */
+		u32 a0;
+		u32 a1;
+		u32 a2;
+		u32 a3;
+		/* t0-t3: Temporary registers for expression evaluation */
+		u32 t0;
+		u32 t1;
+		u32 t2;
+		u32 t3;
+		u32 t4;
+		u32 t5;
+		u32 t6;
+		u32 t7;
+		/* s0-s7: Saved registers */
+		u32 s0;
+		u32 s1;
+		u32 s2;
+		u32 s3;
+		u32 s4;
+		u32 s5;
+		u32 s6;
+		u32 s7;
+		/* t8-t9: Temporary registers for expression evaluation */
+		u32 t8;
+		u32 t9;
+		/* k0-k1: reserved for SO kernel */
+		u32 k0;
+		u32 k1;
+		/* Global pointer */
+		u32 gp;
+		/* Stack pointer */
+		u32 sp;
+		/* Frame pointer */
+		u32 fp;
+		/* Return address */
+		u32 ra;
+	} regs;
+	u32 vector;
+} __attribute__((packed));
+
+extern struct exception_state_t *exception_state_ptr;
+extern u32 *exception_stack_end;
+
+enum {
+	EXC_CACHE_ERROR = 0,
+	EXC_TLB_REFILL_AND_ALL = 1,
+	EXC_INTERRUPT = 2,
+	EXC_EJTAG_DEBUG = 3,
+	EXC_COUNT
+};
+
+#endif /* __MIPS_ARCH_EXCEPTION_H__ */
diff --git a/payloads/libpayload/include/mips/arch/io.h b/payloads/libpayload/include/mips/arch/io.h
new file mode 100644
index 0000000000..d2d9338037
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/io.h
@@ -0,0 +1,67 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * Based on arch/armv7/include/arch/io.h:
+ *   Copyright 2013 Google Inc.
+ *   Copyright (C) 1996-2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_IO_H__
+#define __MIPS_ARCH_IO_H__
+
+#include <arch/types.h>
+#include <arch/cache.h>
+#include <arch/byteorder.h>
+
+#define read8(a)	(*(volatile uint8_t *) (a))
+#define read16(a)	(*(volatile uint16_t *) (a))
+#define read32(a)	(*(volatile uint32_t *) (a))
+
+#define write8(v, a)	(*(volatile uint8_t *) (a) = (v))
+#define write16(v, a)	(*(volatile uint16_t *) (a) = (v))
+#define write32(v, a)	(*(volatile uint32_t *) (a) = (v))
+
+
+/*
+ * Clear and set bits in one shot. These macros can be used to clear and
+ * set multiple bits in a register using a single call. These macros can
+ * also be used to set a multiple-bit bit pattern using a mask, by
+ * specifying the mask in the 'clear' parameter and the new bit pattern
+ * in the 'set' parameter.
+ */
+
+#define out_arch(type, endian, a, v)	write##type(cpu_to_##endian(v), a)
+#define in_arch(type, endian, a)	endian##_to_cpu(read##type(a))
+
+#define readb(a)	read8(a)
+#define readw(a)	read16(a)
+#define readl(a)	read32(a)
+
+#define inb(a)		read8(a)
+#define inw(a)		read16(a)
+#define inl(a)		read32(a)
+
+#define writeb(v, a)	write8(v, a)
+#define writew(v, a)	write16(v, a)
+#define writel(v, a)	write32(v, a)
+
+#define outb(v, a)	write8(v, a)
+#define outw(v, a)	write16(v, a)
+#define outl(v, a)	write32(v, a)
+
+#endif	/* __MIPS_ARCH_IO_H__ */
diff --git a/payloads/libpayload/include/mips/arch/stdint.h b/payloads/libpayload/include/mips/arch/stdint.h
new file mode 100644
index 0000000000..c182530862
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/stdint.h
@@ -0,0 +1,95 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Based on src/arch/armv7/include/stdint.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_STDINT_H__
+#define __MIPS_STDINT_H__
+
+#if defined(__GNUC__)
+#define __HAVE_LONG_LONG__ 1
+#else
+#define __HAVE_LONG_LONG__ 0
+#endif
+
+/* Exact integral types */
+typedef unsigned char      uint8_t;
+typedef signed char        int8_t;
+
+typedef unsigned short     uint16_t;
+typedef signed short       int16_t;
+
+typedef unsigned int       uint32_t;
+typedef signed int         int32_t;
+
+#if __HAVE_LONG_LONG__
+typedef unsigned long long uint64_t;
+typedef signed long long   int64_t;
+#endif
+
+/* Small types */
+typedef unsigned char      uint_least8_t;
+typedef signed char        int_least8_t;
+
+typedef unsigned short     uint_least16_t;
+typedef signed short       int_least16_t;
+
+typedef unsigned int       uint_least32_t;
+typedef signed int         int_least32_t;
+
+#if __HAVE_LONG_LONG__
+typedef unsigned long long uint_least64_t;
+typedef signed long long   int_least64_t;
+#endif
+
+/* Fast Types */
+typedef unsigned char      uint_fast8_t;
+typedef signed char        int_fast8_t;
+
+typedef unsigned int       uint_fast16_t;
+typedef signed int         int_fast16_t;
+
+typedef unsigned int       uint_fast32_t;
+typedef signed int         int_fast32_t;
+
+#if __HAVE_LONG_LONG__
+typedef unsigned long long uint_fast64_t;
+typedef signed long long   int_fast64_t;
+#endif
+
+/* Largest integral types */
+#if __HAVE_LONG_LONG__
+typedef long long int      intmax_t;
+typedef unsigned long long uintmax_t;
+#else
+typedef long int           intmax_t;
+typedef unsigned long int  uintmax_t;
+#endif
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+#if __HAVE_LONG_LONG__
+typedef uint64_t u64;
+#endif
+typedef int8_t s8;
+typedef int16_t s16;
+typedef int32_t s32;
+
+#undef __HAVE_LONG_LONG__
+
+#endif /* __MIPS_STDINT_H__ */
diff --git a/payloads/libpayload/include/mips/arch/types.h b/payloads/libpayload/include/mips/arch/types.h
new file mode 100644
index 0000000000..151817e679
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/types.h
@@ -0,0 +1,76 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * Based on src/arch/armv7/include/arch/types.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_TYPES_H
+#define __MIPS_ARCH_TYPES_H
+
+#include <arch/stdint.h>
+
+typedef unsigned short umode_t;
+
+/*
+ * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
+ * header files exported to user space
+ */
+
+typedef __signed__ char __s8;
+typedef unsigned char __u8;
+
+typedef __signed__ short __s16;
+typedef unsigned short __u16;
+
+typedef __signed__ int __s32;
+typedef unsigned int __u32;
+
+#if defined(__GNUC__)
+__extension__ typedef __signed__ long long __s64;
+__extension__ typedef unsigned long long __u64;
+#endif
+
+typedef signed char s8;
+typedef unsigned char u8;
+
+typedef signed short s16;
+typedef unsigned short u16;
+
+typedef signed int s32;
+typedef unsigned int u32;
+
+typedef signed long long s64;
+typedef unsigned long long u64;
+
+#define BITS_PER_LONG 32
+
+/* Dma addresses are 32-bits wide.  */
+
+typedef u32 dma_addr_t;
+
+typedef unsigned long phys_addr_t;
+typedef unsigned long phys_size_t;
+
+typedef long time_t;
+typedef long suseconds_t;
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+#endif /* __MIPS_ARCH_TYPES_H */
diff --git a/payloads/libpayload/include/mips/arch/virtual.h b/payloads/libpayload/include/mips/arch/virtual.h
new file mode 100644
index 0000000000..70aea20b9c
--- /dev/null
+++ b/payloads/libpayload/include/mips/arch/virtual.h
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2014 Imagination Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __MIPS_ARCH_VIRTUAL_H
+#define __MIPS_ARCH_VIRTUAL_H
+
+extern unsigned long virtual_offset;
+
+#define virt_to_phys(virt) ((unsigned long) (virt) + virtual_offset)
+#define phys_to_virt(phys) ((void *) ((unsigned long) (phys) - virtual_offset))
+
+#define virt_to_bus(addr) virt_to_phys(addr)
+#define bus_to_virt(addr) phys_to_virt(addr)
+
+#endif
diff --git a/payloads/libpayload/include/swab.h b/payloads/libpayload/include/swab.h
new file mode 100644
index 0000000000..2198077ad2
--- /dev/null
+++ b/payloads/libpayload/include/swab.h
@@ -0,0 +1,44 @@
+#ifndef _SWAB_H
+#define _SWAB_H
+
+/*
+ * linux/byteorder/swab.h
+ * Byte-swapping, independently from CPU endianness
+ *	swabXX[ps]?(foo)
+ *
+ * Francois-Rene Rideau <fare@tunes.org> 19971205
+ *    separated swab functions from cpu_to_XX,
+ *    to clean up support for bizarre-endian architectures.
+ *
+ * See asm-i386/byteorder.h and suches for examples of how to provide
+ * architecture-dependent optimized versions
+ *
+ */
+
+/* casts are necessary for constants, because we never know for sure
+ * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
+ */
+#define swab16(x) \
+	((unsigned short)( \
+		(((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
+		(((unsigned short)(x) & (unsigned short)0xff00U) >> 8)))
+
+#define swab32(x) \
+	((unsigned int)( \
+		(((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
+		(((unsigned int)(x) & (unsigned int)0x0000ff00UL) <<  8) | \
+		(((unsigned int)(x) & (unsigned int)0x00ff0000UL) >>  8) | \
+		(((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24)))
+
+#define swab64(x) \
+	((uint64_t)( \
+		(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
+		(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
+		(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
+		(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
+		(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
+		(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
+		(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
+		(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
+
+#endif /* _SWAB_H */
diff --git a/payloads/libpayload/util/xcompile/xcompile b/payloads/libpayload/util/xcompile/xcompile
index 9cc2d6923e..214e9afe21 100644
--- a/payloads/libpayload/util/xcompile/xcompile
+++ b/payloads/libpayload/util/xcompile/xcompile
@@ -110,11 +110,13 @@ detect_special_flags() {
 			# testcc "$CC" "$CFLAGS -mcpu=cortex-a9" &&
 			#	CFLAGS="$CFLAGS -mcpu=cortex-a9"
 			;;
-	esac
 
-	case "$architecture" in
 		arm64-generic )
 			;;
+		mips )
+			testcc "$CC" "CFLAGS -mxgot" &&
+				CFLAGS="$CFLAGS -mxgot"
+			;;
 	esac
 }
 
@@ -140,7 +142,7 @@ touch "$TMPFILE"
 trap clean_up EXIT
 
 # Architecture definition
-SUPPORTED_ARCHITECTURE="x86 arm arm64"
+SUPPORTED_ARCHITECTURE="arm arm64 mipsel x86"
 
 # ARM Architecture
 TARCH_arm="arm"
@@ -154,18 +156,25 @@ TBFDARCH_arm64="littleaarch64"
 TCLIST_arm64="aarch64"
 TWIDTH_arm64="64"
 
+# MIPS Architecture (Little Endian)
+TARCH_mipsel="mipsel"
+TBFDARCH_mipsel="tradlittlemips littlemips"
+TCLIST_mipsel="mipsel"
+TWIDTH_mipsel="32"
+
 # X86 Architecture
 TARCH_x86="i386"
 TBFDARCH_x86="i386"
 TCLIST_x86="i386 x86_64"
 TWIDTH_x86="32"
+
 XGCCPATH=${1:-"`pwd`/../../util/crossgcc/xgcc/bin/"}
 
 # This loops over all supported architectures.
 for architecture in $SUPPORTED_ARCHITECTURE; do
 	GCCPREFIX="invalid"
 	TARCH="$(eval echo \$TARCH_$architecture)"
-	TBFDARCH="$(eval echo \$TBFDARCH_$architecture)"
+	TBFDARCHS="$(eval echo \$TBFDARCH_$architecture)"
 	TCLIST="$(eval echo \$TCLIST_$architecture)"
 	TWIDTH="$(eval echo \$TWIDTH_$architecture)"
 	[ -z "$TARCH" -o -z "$TCLIST" -o -z "$TWIDTH" ] &&
@@ -186,10 +195,13 @@ for architecture in $SUPPORTED_ARCHITECTURE; do
 	echo "# $architecture TARCH_SEARCH=$search"
 
 	# Search toolchain by checking assembler capability.
-	for gccprefixes in $search ""; do
-		program_exists "${gccprefixes}as" || continue
-		testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "" && break
-		testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "TRUE" && break
+	for TBFDARCH in $TBFDARCHS; do
+		for gccprefixes in $search ""; do
+			program_exists "${gccprefixes}as" || continue
+			testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "" && break
+			testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "TRUE" && break
+		done
+		[ "$GCCPREFIX" = "invalid" ] || break
 	done
 
 	if [ "$GCCPREFIX" = "invalid" ]; then
-- 
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