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libpayload: Fix reading x86 CBFS images from RAM

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Three issues:
 1. the hardcoded dereferenced pointer at 0xfffffffc
 2. "RAM media" has no idea about ROM relative addresses
 3. off-by-one in RAM media: it's legal to request 4 bytes from 0xfffffffc

Change-Id: I671ac12d412c71dc8e8e6114f2ea13f58dd99c1d
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/2624
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
This commit is contained in:
Patrick Georgi
2013-03-09 10:52:50 +01:00
parent 6e7abcd4b5
commit db2e3aa257
2 changed files with 13 additions and 3 deletions
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10
payloads/libpayload/libcbfs/cbfs.c
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@ -65,8 +65,14 @@
#if defined(CONFIG_CBFS_HEADER_ROM_OFFSET) && (CONFIG_CBFS_HEADER_ROM_OFFSET)
# define CBFS_HEADER_ROM_ADDRESS (CONFIG_CBFS_HEADER_ROM_OFFSET)
#else
// Indirect address: only works on 32bit top-aligned systems.
# define CBFS_HEADER_ROM_ADDRESS (*(uint32_t*)0xfffffffc)
/* ugly hack: this assumes that "media" exists
in the scope where the macro is used. */
static uint32_t fetch_x86_header(struct cbfs_media *media)
{
uint32_t *header_ptr = media->map(media, 0xfffffffc, 4);
return *header_ptr;
}
# define CBFS_HEADER_ROM_ADDRESS fetch_x86_header(media)
#endif
#include "cbfs_core.c"