diff options
| -rw-r--r-- | src/arch/i386/prefix/romprefix.S | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S index d248916d..2664e340 100644 --- a/src/arch/i386/prefix/romprefix.S +++ b/src/arch/i386/prefix/romprefix.S @@ -345,20 +345,22 @@ got_pmm: /* PMM allocation succeeded */ shll $9, %ecx addr32 rep movsb /* PMM presence implies flat real mode */ movl %edi, decompress_to - /* Shrink ROM and update checksum */ + /* Shrink ROM */ + movb $_prefix_memsz_sect, romheader_size +pmm_fail: + /* Restore upper register halves */ + popal +no_pmm: + + /* Update checksum */ xorw %bx, %bx xorw %si, %si - movw $_prefix_memsz_sect, %cx - movb %cl, romheader_size + movzbw romheader_size, %cx shlw $9, %cx 1: lodsb addb %al, %bl loop 1b subb %bl, checksum -pmm_fail: - /* Restore upper register halves */ - popal -no_pmm: /* Copy self to option ROM space. Required for PCI3.0, which * loads us to a temporary location in low memory. Will be a |