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authorLee Leahy <leroy.p.leahy@intel.com>2016-06-05 18:41:00 -0700
committerLeroy P Leahy <leroy.p.leahy@intel.com>2016-06-11 19:22:42 +0200
commit2030d257d19920904ad370509404145c18627fac (patch)
tree7c6b095d0439b7e42fce52d7759c08bf6692cda1 /src/arch
parentdb601b68182df47a28b106ba07e97f222ff39140 (diff)
downloadcoreboot-2030d257d19920904ad370509404145c18627fac.tar.xz
arch/x86: Support "weak" BIST and timestamp save routines
Not all x86 architectures support the mm register set. The default routine that saves BIST in mm0 and a "weak" routine that saves the TSC value in mm2:mm1. Select the Kconfig value BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP to provide a replacement routine to save the BIST and timestamp values. TEST=Build and run on Amenia and Galileo Gen2. Change-Id: I8119e74664ac3522c011767d424d441cd62545ce Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com> Reviewed-on: https://review.coreboot.org/15126 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/Kconfig9
-rw-r--r--src/arch/x86/bootblock_crt0.S22
2 files changed, 28 insertions, 3 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index 1fea99ac3b..b6073c36ff 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -133,6 +133,15 @@ config BOOTBLOCK_NORTHBRIDGE_INIT
config BOOTBLOCK_RESETS
string
+config BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP
+ bool
+ default n
+ help
+ Select this value to provide a routine to save the BIST and timestamp
+ values. The default code places the BIST value in MM0 and the
+ timestamp value in MM2:MM1. Another file is necessary when the CPU
+ does not support the MMx register set.
+
config HAVE_CMOS_DEFAULT
def_bool n
diff --git a/src/arch/x86/bootblock_crt0.S b/src/arch/x86/bootblock_crt0.S
index 8ae82b4368..1b160f483b 100644
--- a/src/arch/x86/bootblock_crt0.S
+++ b/src/arch/x86/bootblock_crt0.S
@@ -43,12 +43,28 @@ debug_spinloop:
#endif
bootblock_protected_mode_entry:
- /* Save BIST result */
- movd %eax, %mm0
- /* Save an early timestamp */
+
+ /* BIST result in eax */
+ movl %eax, %ebx
+
+ /* Get an early timestamp */
rdtsc
+
+#if IS_ENABLED(CONFIG_BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP)
+ lea 1f, %ebp
+
+ /* eax: Low 32-bits of timestamp
+ * ebx: BIST result
+ * ebp: return address
+ * edx: High 32-bits of timestamp
+ */
+ jmp bootblock_save_bist_and_timestamp
+1:
+#else
+ movd %ebx, %mm0
movd %eax, %mm1
movd %edx, %mm2
+#endif
#if IS_ENABLED(CONFIG_SSE)
enable_sse: