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lib/cbfs: Use fmap derived information about the COREBOOT region 

It used to use CONFIG_CBFS_SIZE. The plan is that CBFS_SIZE only informs
default*.fmd generation, while everything else derives its information
from there.

Also document the existing assumption that boot media should access the
COREBOOT region (and not any other potentially existing fmap region
containing a CBFS).

Change-Id: I08254e4510f71edf99c2c8b56ac8f92008727c4a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14572
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Georgi 2016-05-02 17:22:29 +08:00 committed by Patrick Georgi
parent 919be612b8
commit 58a150a1a3
2 changed files with 14 additions and 2 deletions
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7
src/lib/Makefile.inc
View File

@ -179,6 +179,13 @@ $(call src-to-obj,smm,$(dir)/version.c) : $(obj)/build.h
$(call src-to-obj,verstage,$(dir)/version.c) : $(obj)/build.h
$(call src-to-obj,postcar,$(dir)/version.c) : $(obj)/build.h
$(call src-to-obj,bootblock,$(dir)/cbfs.c) : $(obj)/fmap_config.h
$(call src-to-obj,romstage,$(dir)/cbfs.c) : $(obj)/fmap_config.h
$(call src-to-obj,ramstage,$(dir)/cbfs.c) : $(obj)/fmap_config.h
$(call src-to-obj,smm,$(dir)/cbfs.c) : $(obj)/fmap_config.h
$(call src-to-obj,verstage,$(dir)/cbfs.c) : $(obj)/fmap_config.h
$(call src-to-obj,postcar,$(dir)/cbfs.c) : $(obj)/fmap_config.h
romstage-y += bootmode.c
ramstage-y += bootmode.c
verstage-y += bootmode.c

9
src/lib/cbfs.c
View File

@ -25,6 +25,8 @@
#include <symbols.h>
#include <timestamp.h>
#include "fmap_config.h"
#define ERROR(x...) printk(BIOS_ERR, "CBFS: " x)
#define LOG(x...) printk(BIOS_INFO, "CBFS: " x)
#if IS_ENABLED(CONFIG_DEBUG_CBFS)
@ -215,6 +217,7 @@ out:
return 0;
}
/* This only supports the "COREBOOT" fmap region. */
static int cbfs_master_header_props(struct cbfs_props *props)
{
struct cbfs_header header;
@ -227,13 +230,15 @@ static int cbfs_master_header_props(struct cbfs_props *props)
if (bdev == NULL)
return -1;
size_t fmap_top = ___FMAP__COREBOOT_BASE + ___FMAP__COREBOOT_SIZE;
/* Find location of header using signed 32-bit offset from
* end of CBFS region. */
offset = CONFIG_CBFS_SIZE - sizeof(int32_t);
offset = fmap_top - sizeof(int32_t);
if (rdev_readat(bdev, &rel_offset, offset, sizeof(int32_t)) < 0)
return -1;
offset = CONFIG_CBFS_SIZE + rel_offset;
offset = fmap_top + rel_offset;
if (rdev_readat(bdev, &header, offset, sizeof(header)) < 0)
return -1;