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util/cbfstool/linux_trampoline: Support more e820 entries 

Since linux commit f9ba70535dc12d9eb57d466a2ecd749e16eca866
"[PATCH] Increase number of e820 entries hard limit from 32 to 128"
made in 2005 the number of e820 entries passed from the bootloader
is 128. Use the boot protocol version to check for support of
128 entries and use them if necessary.

Tested on IBM/SBP1:
Fixes booting a Linux payload when more than 32 entries are present
in the memory table, which can easily happen on a 4 socket platform.

Change-Id: Iec0a832fff091b6c3ae7050ef63e743a30618f25
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80544
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marvin Drees <marvin.drees@9elements.com>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Patrick Rudolph 2024-02-15 10:28:00 +01:00 committed by Lean Sheng Tan
parent 29f7c4f0a6
commit 7d4155e6e6
2 changed files with 36 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
util/cbfstool/linux_trampoline.S
View File

@ -61,9 +61,22 @@ jne .testAcpiRsdp
mov 4(%ebx), %eax
sub $8, %eax
shr $2, %eax /* eax = number of dwords of e820 data */
/*
* Historically linux had space for 32 entries. This limit was increased in
* the year 2005 (Linux 2.6.11) to hold up to 128 entries.
* Assume 128 entries when the boot protocol version is 2.04+.
*/
cmpw $0x0204, (LINUX_PARAM_LOC + PROTOCOL_VERSION)
jge .e820big /* protocol version >= 2.04 can handle 128 entries of 5 dwords */
cmp $(32 * 5), %eax /* linux wants at most 32 entries of 5 dwords */
jng 1f
mov $(32 * 5), %eax /* only copy 32 entries */
jmp 1f
.e820big:
cmp $(128 * 5), %eax /* linux wants at most 128 entries of 5 dwords */
jng 1f
mov $(128 * 5), %eax /* only copy 128 entries */
1:
mov %eax, %esi
mov $5, %edi

44
util/cbfstool/linux_trampoline.c
View File

@ -3,25 +3,27 @@
unsigned char trampoline[] = {
0xfc, 0x31, 0xd2, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb, 0x00, 0x00, 0x01, 0x00, 0x01, 0xcb, 0x8b,
0x01, 0x3d, 0x4c, 0x42, 0x49, 0x4f, 0x74, 0x07, 0x83, 0xc1, 0x10, 0x39, 0xcb, 0x75, 0xe9, 0x39,
0xcb, 0x0f, 0x84, 0x2e, 0x01, 0x00, 0x00, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83,
0x3b, 0x11, 0x75, 0x05, 0x8b, 0x4b, 0x08, 0xeb, 0xcf, 0x83, 0x3b, 0x01, 0x75, 0x57, 0x8b, 0x43,
0x04, 0x83, 0xe8, 0x08, 0xc1, 0xe8, 0x02, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0xa0,
0x00, 0x00, 0x00, 0x89, 0xc6, 0xbf, 0x05, 0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09,
0x00, 0x89, 0xf0, 0x91, 0x8d, 0x73, 0x08, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xa1,
0xe8, 0x01, 0x09, 0x00, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0x83, 0xf8, 0x00, 0x0f, 0x84, 0x94, 0x00,
0x00, 0x00, 0x83, 0x7f, 0x10, 0x0c, 0x7e, 0x07, 0xc7, 0x47, 0x10, 0x02, 0x00, 0x00, 0x00, 0x48,
0x83, 0xc7, 0x14, 0xeb, 0xe4, 0x83, 0x3b, 0x43, 0x75, 0x12, 0x8b, 0x43, 0x08, 0xa3, 0x70, 0x00,
0x09, 0x00, 0x8b, 0x43, 0x0c, 0xa3, 0x74, 0x00, 0x09, 0x00, 0xeb, 0x6a, 0x83, 0x3b, 0x12, 0x75,
0x65, 0x66, 0x81, 0x3d, 0x06, 0x02, 0x09, 0x00, 0x0f, 0x02, 0x7d, 0x06, 0x83, 0x7b, 0x0c, 0x00,
0x75, 0x54, 0xbf, 0x00, 0x00, 0x09, 0x00, 0x8b, 0x43, 0x08, 0x89, 0x47, 0x18, 0x8b, 0x43, 0x0c,
0x89, 0x47, 0x3a, 0x8b, 0x43, 0x10, 0x66, 0x89, 0x47, 0x12, 0x8b, 0x43, 0x14, 0x66, 0x89, 0x47,
0x14, 0x8b, 0x53, 0x18, 0x66, 0x89, 0x57, 0x24, 0xf7, 0xe2, 0x89, 0x47, 0x1c, 0x66, 0x0f, 0xb6,
0x43, 0x1c, 0x66, 0x89, 0x47, 0x16, 0xbe, 0x04, 0x00, 0x00, 0x00, 0x66, 0x8b, 0x44, 0x73, 0x1b,
0x66, 0xd1, 0xc0, 0x66, 0x89, 0x44, 0x77, 0x24, 0x4e, 0x75, 0xf0, 0xc7, 0x47, 0x36, 0x02, 0x00,
0x00, 0x00, 0xc6, 0x47, 0x0f, 0x70, 0x03, 0x5b, 0x04, 0x49, 0x0f, 0x85, 0x0f, 0xff, 0xff, 0xff,
0xb8, 0x00, 0x00, 0x04, 0x00, 0xc7, 0x40, 0x10, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x40, 0x14, 0x00,
0x9b, 0xcf, 0x00, 0xc7, 0x40, 0x18, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x40, 0x1c, 0x00, 0x93, 0xcf,
0x00, 0xc6, 0x00, 0x2b, 0x89, 0x40, 0x02, 0x0f, 0x01, 0x10, 0xbe, 0x00, 0x00, 0x09, 0x00, 0xff,
0x25, 0x14, 0x02, 0x09, 0x00, 0xf4, 0xeb, 0xfd
0xcb, 0x0f, 0x84, 0x47, 0x01, 0x00, 0x00, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83,
0x3b, 0x11, 0x75, 0x05, 0x8b, 0x4b, 0x08, 0xeb, 0xcf, 0x83, 0x3b, 0x01, 0x75, 0x70, 0x8b, 0x43,
0x04, 0x83, 0xe8, 0x08, 0xc1, 0xe8, 0x02, 0x66, 0x81, 0x3d, 0x06, 0x02, 0x09, 0x00, 0x04, 0x02,
0x7d, 0x0e, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x13, 0xb8, 0xa0, 0x00, 0x00, 0x00, 0xeb, 0x0c,
0x3d, 0x80, 0x02, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0x80, 0x02, 0x00, 0x00, 0x89, 0xc6, 0xbf, 0x05,
0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09, 0x00, 0x89, 0xf0, 0x91, 0x8d, 0x73, 0x08,
0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xa1, 0xe8, 0x01, 0x09, 0x00, 0xbf, 0xd0, 0x02,
0x09, 0x00, 0x83, 0xf8, 0x00, 0x0f, 0x84, 0x94, 0x00, 0x00, 0x00, 0x83, 0x7f, 0x10, 0x0c, 0x7e,
0x07, 0xc7, 0x47, 0x10, 0x02, 0x00, 0x00, 0x00, 0x48, 0x83, 0xc7, 0x14, 0xeb, 0xe4, 0x83, 0x3b,
0x43, 0x75, 0x12, 0x8b, 0x43, 0x08, 0xa3, 0x70, 0x00, 0x09, 0x00, 0x8b, 0x43, 0x0c, 0xa3, 0x74,
0x00, 0x09, 0x00, 0xeb, 0x6a, 0x83, 0x3b, 0x12, 0x75, 0x65, 0x66, 0x81, 0x3d, 0x06, 0x02, 0x09,
0x00, 0x0f, 0x02, 0x7d, 0x06, 0x83, 0x7b, 0x0c, 0x00, 0x75, 0x54, 0xbf, 0x00, 0x00, 0x09, 0x00,
0x8b, 0x43, 0x08, 0x89, 0x47, 0x18, 0x8b, 0x43, 0x0c, 0x89, 0x47, 0x3a, 0x8b, 0x43, 0x10, 0x66,
0x89, 0x47, 0x12, 0x8b, 0x43, 0x14, 0x66, 0x89, 0x47, 0x14, 0x8b, 0x53, 0x18, 0x66, 0x89, 0x57,
0x24, 0xf7, 0xe2, 0x89, 0x47, 0x1c, 0x66, 0x0f, 0xb6, 0x43, 0x1c, 0x66, 0x89, 0x47, 0x16, 0xbe,
0x04, 0x00, 0x00, 0x00, 0x66, 0x8b, 0x44, 0x73, 0x1b, 0x66, 0xd1, 0xc0, 0x66, 0x89, 0x44, 0x77,
0x24, 0x4e, 0x75, 0xf0, 0xc7, 0x47, 0x36, 0x02, 0x00, 0x00, 0x00, 0xc6, 0x47, 0x0f, 0x70, 0x03,
0x5b, 0x04, 0x49, 0x0f, 0x85, 0xf6, 0xfe, 0xff, 0xff, 0xb8, 0x00, 0x00, 0x04, 0x00, 0xc7, 0x40,
0x10, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x40, 0x14, 0x00, 0x9b, 0xcf, 0x00, 0xc7, 0x40, 0x18, 0xff,
0xff, 0x00, 0x00, 0xc7, 0x40, 0x1c, 0x00, 0x93, 0xcf, 0x00, 0xc6, 0x00, 0x2b, 0x89, 0x40, 0x02,
0x0f, 0x01, 0x10, 0xbe, 0x00, 0x00, 0x09, 0x00, 0xff, 0x25, 0x14, 0x02, 0x09, 0x00, 0xf4, 0xeb,
0xfd
};
unsigned int trampoline_len = 344;
unsigned int trampoline_len = 369;