diff options
Diffstat (limited to 'src/arch/x86/lib/walkcbfs.S')
| -rw-r--r-- | src/arch/x86/lib/walkcbfs.S | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/src/arch/x86/lib/walkcbfs.S b/src/arch/x86/lib/walkcbfs.S deleted file mode 100644 index 60eb8b53b0..0000000000 --- a/src/arch/x86/lib/walkcbfs.S +++ /dev/null @@ -1,117 +0,0 @@ -#define CBFS_HEADER_PTR 0xfffffffc - -#define CBFS_HEADER_MAGIC 0 -#define CBFS_HEADER_VERSION (CBFS_HEADER_MAGIC + 4) -#define CBFS_HEADER_ROMSIZE (CBFS_HEADER_VERSION + 4) -#define CBFS_HEADER_BOOTBLOCKSIZE (CBFS_HEADER_ROMSIZE + 4) -#define CBFS_HEADER_ALIGN (CBFS_HEADER_BOOTBLOCKSIZE + 4) -#define CBFS_HEADER_OFFSET (CBFS_HEADER_ALIGN + 4) - -#define CBFS_FILE_MAGIC 0 -#define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8) -#define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4) -#define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4) -#define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4) - -#define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4) - -/* - * input %esi: filename - * input %esp: return address (not pointer to return address!) - * output %eax: pointer to CBFS header - * clobbers %ebx, %ecx, %edi - */ -walkcbfs_asm: - cld - - mov CBFS_HEADER_PTR, %eax - mov CBFS_HEADER_ROMSIZE(%eax), %ecx - bswap %ecx - mov $0, %ebx - sub %ecx, %ebx /* rom base address in ebx */ - mov CBFS_HEADER_OFFSET(%eax), %ecx - bswap %ecx - add %ecx, %ebx /* address where we start looking for LARCHIVEs */ - - /* determine filename length */ - mov $0, %eax -1: - cmpb $0, (%eax,%esi) - jz 2f - add $1, %eax - jmp 1b -2: - add $1, %eax -walker: - 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 */ - jnz tryharder - - /* we found it! */ - mov %ebx, %eax - jmp *%esp - -tryharder: - sub %ebx, %edi - sub $CBFS_FILE_STRUCTSIZE, %edi /* edi = # of walked bytes */ - sub %edi, %esi /* esi = start of filename */ - - /* ebx = ecx = (current+offset+len+ALIGN-1) & ~(ALIGN-1) */ - mov CBFS_FILE_OFFSET(%ebx), %ecx - bswap %ecx - add %ebx, %ecx - mov CBFS_FILE_LEN(%ebx), %edi - bswap %edi - add %edi, %ecx - mov CBFS_HEADER_PTR, %edi - mov CBFS_HEADER_ALIGN(%edi), %edi - bswap %edi - sub $1, %edi - add %edi, %ecx - not %edi - and %edi, %ecx - - /* if oldaddr >= addr, leave */ - cmp %ebx, %ecx - jbe out - - mov %ecx, %ebx - -check_for_exit: - /* look if we should exit: did we pass into the bootblock already? */ - mov CBFS_HEADER_PTR, %ecx - mov CBFS_HEADER_BOOTBLOCKSIZE(%ecx), %ecx - bswap %ecx - not %ecx - add $1, %ecx - - cmp %ecx, %ebx - /* if bootblockstart >= addr (==we're still in the data area) , jump back */ - jbe walker - -out: - mov $0, %eax - jmp *%esp - - -searchfile: - /* if filemagic isn't found, move forward cbfs_header->align bytes */ - mov CBFS_HEADER_PTR, %edi - mov CBFS_HEADER_ALIGN(%edi), %edi - bswap %edi - add %edi, %ebx - jmp check_for_exit - -filemagic: - .ascii "LARCHIVE" |