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>

1 files changed, 107 insertions, 0 deletions

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();
+}