From 5672dcd58c0ae7f7a0d14af0a88ff9c534e0936a Mon Sep 17 00:00:00 2001 From: Andrey Petrov Date: Fri, 12 Feb 2016 15:12:43 -0800 Subject: soc/intel/apollolake: Add support for memory-mapped boot media On Apollo Lake SPI flash is memory mapped. The mapping is different to previous platforms. Only "BIOS" region is mapped in contrast to whole flash. Also, the 128 KiB right below 4 GiB are being decoded by readonly SRAM. Fail accesses to those regions, rather than returning false data. Change-Id: Iac3fa74cd221a5a46ceb34c2a79470290bcc2d84 Signed-off-by: Andrey Petrov Reviewed-on: https://review.coreboot.org/13706 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/mainboard/intel/apollolake_rvp/Kconfig | 9 ++++ src/soc/intel/apollolake/Kconfig | 5 ++ src/soc/intel/apollolake/Makefile.inc | 3 ++ src/soc/intel/apollolake/mmap_boot.c | 74 ++++++++++++++++++++++++++++++ 4 files changed, 91 insertions(+) create mode 100644 src/soc/intel/apollolake/mmap_boot.c (limited to 'src') diff --git a/src/mainboard/intel/apollolake_rvp/Kconfig b/src/mainboard/intel/apollolake_rvp/Kconfig index 52d3777b35..9920b46fdf 100644 --- a/src/mainboard/intel/apollolake_rvp/Kconfig +++ b/src/mainboard/intel/apollolake_rvp/Kconfig @@ -17,4 +17,13 @@ config MAINBOARD_VENDOR string default "Intel" +config IFD_BIOS_END + hex + default 0x6FF000 + +config IFD_BIOS_START + hex + default 0x1000 + + endif diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig index c32b80f38f..2f6101582f 100644 --- a/src/soc/intel/apollolake/Kconfig +++ b/src/soc/intel/apollolake/Kconfig @@ -85,4 +85,9 @@ config C_ENV_BOOTBLOCK_SIZE hex default 0x8000 +# This SoC does not map SPI flash like many previous SoC. Therefore we provide +# a custom media driver that facilitates mapping +config X86_TOP4G_BOOTMEDIA_MAP + bool + default n endif diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc index 76fa4c7050..e27fd27128 100644 --- a/src/soc/intel/apollolake/Makefile.inc +++ b/src/soc/intel/apollolake/Makefile.inc @@ -11,6 +11,7 @@ bootblock-y += bootblock/bootblock.c bootblock-y += bootblock/cache_as_ram.S bootblock-y += bootblock/bootblock.c bootblock-y += gpio.c +bootblock-y += mmap_boot.c bootblock-y += placeholders.c bootblock-y += tsc_freq.c bootblock-$(CONFIG_SOC_UART_DEBUG) += uart_early.c @@ -18,11 +19,13 @@ bootblock-$(CONFIG_SOC_UART_DEBUG) += uart_early.c romstage-y += placeholders.c romstage-y += gpio.c romstage-$(CONFIG_SOC_UART_DEBUG) += uart_early.c +romstage-y += mmap_boot.c smm-y += placeholders.c ramstage-y += placeholders.c ramstage-y += gpio.c ramstage-$(CONFIG_SOC_UART_DEBUG) += uart_early.c +ramstage-y += mmap_boot.c CPPFLAGS_common += -I$(src)/soc/intel/apollolake/include diff --git a/src/soc/intel/apollolake/mmap_boot.c b/src/soc/intel/apollolake/mmap_boot.c new file mode 100644 index 0000000000..36259243f4 --- /dev/null +++ b/src/soc/intel/apollolake/mmap_boot.c @@ -0,0 +1,74 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015 Intel Corp. + * (Written by Andrey Petrov for Intel Corp.) + * (Written by Alexandru Gagniuc for Intel Corp.) + * + * 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; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include + +/* The 128 KiB right below 4G are decoded by readonly SRAM, not boot media */ +#define IFD_BIOS_MAX_MAPPED (CONFIG_IFD_BIOS_END - 128 * KiB) +#define IFD_MAPPED_SIZE (IFD_BIOS_MAX_MAPPED - CONFIG_IFD_BIOS_START) +#define IFD_BIOS_SIZE (CONFIG_IFD_BIOS_END - CONFIG_IFD_BIOS_START) + +/* + * If Apollo Lake is configured to boot from SPI flash "BIOS" region + * (as defined in descriptor) is mapped below 4GiB. Form a pointer for + * the base. + */ +#define VIRTUAL_ROM_BASE ((uintptr_t)(0x100000000ULL - IFD_BIOS_SIZE)) + +static const struct mem_region_device shadow_dev = MEM_REGION_DEV_INIT( + VIRTUAL_ROM_BASE, IFD_BIOS_MAX_MAPPED +); + +/* + * This is how we translate physical SPI flash address space into CPU memory-mapped space. In + * essence this means "BIOS" region (usually starts at flash physical 0x1000 is mapped to + * 4G - IFD_BIOS_SIZE. + */ +static const struct xlate_region_device real_dev = XLATE_REGION_INIT( + &shadow_dev.rdev, CONFIG_IFD_BIOS_START, + IFD_MAPPED_SIZE, CONFIG_ROM_SIZE +); + +const struct region_device *boot_device_ro(void) +{ + return &real_dev.rdev; +} + +static int iafw_boot_region_properties(struct cbfs_props *props) +{ + struct region regn; + + /* use fmap to locate CBFS area */ + if (fmap_locate_area("COREBOOT", ®n)) + return -1; + + props->offset = region_offset(®n); + props->size = region_sz(®n); + + printk(BIOS_DEBUG, "CBFS @ %zx size %zx\n", props->offset, props->size); + + return 0; +} + +/* + * Named cbfs_master_header_locator so that it overrides the default, but + * incompatible locator in cbfs.c + */ +const struct cbfs_locator cbfs_master_header_locator = { + .name = "IAFW Locator", + .locate = iafw_boot_region_properties, +}; -- cgit v1.2.3