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>

2 files changed, 36 insertions, 21 deletions

diff --git a/util/cbfstool/linux_trampoline.S b/util/cbfstool/linux_trampoline.S
index 941ab3f2e0..6a62ff0ed5 100644
--- a/util/cbfstool/linux_trampoline.S
+++ b/util/cbfstool/linux_trampoline.S
@@ -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
diff --git a/util/cbfstool/linux_trampoline.c b/util/cbfstool/linux_trampoline.c
index 794b245007..13c0edb557 100644
--- a/util/cbfstool/linux_trampoline.c
+++ b/util/cbfstool/linux_trampoline.c
@@ -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;