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| author | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2011-04-14 20:33:53 +0000 |
|---|---|---|
| committer | Stefan Reinauer <stepan@openbios.org> | 2011-04-14 20:33:53 +0000 |
| commit | 1fdfed1798259ad9e123e9329b9810033df0e3c0 (patch) | |
| tree | ee99711aebda859474f9301b7999cc3bc789248d /src/arch | |
| parent | 31853d8976ffd817bc773d559f104d2c42ed0c43 (diff) | |
| download | coreboot-1fdfed1798259ad9e123e9329b9810033df0e3c0.tar.xz | |
add some comments to walkcbfs.S
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6498 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/lib/walkcbfs.S | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/src/arch/x86/lib/walkcbfs.S b/src/arch/x86/lib/walkcbfs.S index 27d82ae742..2dc9617651 100644 --- a/src/arch/x86/lib/walkcbfs.S +++ b/src/arch/x86/lib/walkcbfs.S @@ -16,11 +16,11 @@ #define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4) /* - input %esi: filename - input %esp: return address (not pointer to return address!) - output %eax: entry point - clobbers %ebx, %ecx, %edi -*/ + * input %esi: filename + * input %esp: return address (not pointer to return address!) + * output %eax: entry point + * clobbers %ebx, %ecx, %edi + */ walkcbfs_asm: cld @@ -28,10 +28,10 @@ walkcbfs_asm: mov CBFS_HEADER_ROMSIZE(%eax), %ecx bswap %ecx mov $0, %ebx - sub %ecx, %ebx + sub %ecx, %ebx /* rom base address in ebx */ mov CBFS_HEADER_OFFSET(%eax), %ecx bswap %ecx - add %ecx, %ebx + add %ecx, %ebx /* address where we start looking for LARCHIVEs */ /* determine filename length */ mov $0, %eax @@ -43,21 +43,22 @@ walkcbfs_asm: 2: add $1, %eax walker: - mov 0(%ebx), %edi + mov 0(%ebx), %edi /* Check for LARCHIVE header */ cmp %edi, filemagic jne searchfile mov 4(%ebx), %edi cmp %edi, filemagic+4 jne searchfile + /* LARCHIVE header found */ mov %ebx, %edi add $CBFS_FILE_STRUCTSIZE, %edi /* edi = address of first byte after struct cbfs_file */ mov %eax, %ecx repe cmpsb - # zero flag set if strings are equal + /* zero flag set if strings are equal */ jnz tryharder - # we found it! + /* we found it! */ mov CBFS_FILE_OFFSET(%ebx), %eax bswap %eax add %ebx, %eax |