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[mromprefix] Allow for .mrom images larger than 128kB

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The .mrom payload has a code type of 0xff and so the initialisation
length field (single byte at offset 0x02) does not need to be
present.  Use only the PCI header's image length field, which allows
the .mrom payload to be up to 32MB in size.

Inspired-by: Swift Geek <swiftgeek@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-08-26 12:33:40 +01:00
parent 3937274cfb
commit 8049a52840
1 changed files with 1 additions and 9 deletions
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10
src/arch/i386/prefix/mromprefix.S
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@ -196,7 +196,7 @@ find_mem_bar:
movl %eax, %esi
addr32 es movzbl 2(%esi), %ecx
shll $7, %ecx
addr32 es movzbl 2(%esi,%ecx,4), %edx
addr32 es movzwl mpciheader_image_length(%esi,%ecx,4), %edx
shll $7, %edx
addl %edx, %ecx
addr32 es rep movsl
@ -463,20 +463,12 @@ pci_set_mem_access:
.org 0x00
mromheader:
.word 0xaa55 /* BIOS extension signature */
mromheader_size: .byte 0 /* Size in 512-byte blocks */
.org 0x18
.word mpciheader
.org 0x1a
.word 0
.size mromheader, . - mromheader
.section ".zinfo.fixup", "a", @progbits /* Compressor fixups */
.ascii "APPB"
.long mromheader_size
.long 512
.long 0
.previous
mpciheader:
.ascii "PCIR" /* Signature */
.word pci_vendor_id /* Vendor identification */