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arch/x86: Unify bootblock MMX register usage

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Have same usage of registers with romcc bootblock
and C_ENVIRONMENT_BOOTBLOCK.

Change-Id: Ibfa80e40f0b736a904abf4245fc23efc0cdc458d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30490
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Kyösti Mälkki 2018-12-28 16:06:45 +02:00
parent 6267f5dd11
commit ee2e936f40
3 changed files with 24 additions and 18 deletions
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13
src/arch/x86/timestamp.inc
View file

@ -13,8 +13,8 @@
/*
* Store the initial timestamp for booting in mmx registers. This works
* because the bootblock isn't being compiled with MMX support so mm0 and
* mm1 will be preserved into romstage.
* because the bootblock isn't being compiled with MMX support so mm1 and
* mm2 will be preserved into romstage.
*/
.code32
@ -22,12 +22,13 @@
stash_timestamp:
/* Save the BIST value */
movl %eax, %ebp
movl %eax, %ebx
finit
rdtsc
movd %eax, %mm0
movd %edx, %mm1
movd %ebx, %mm0
movd %eax, %mm1
movd %edx, %mm2
/* Restore the BIST value to %eax */
movl %ebp, %eax
movl %ebx, %eax

17
src/drivers/intel/fsp1_1/cache_as_ram.inc
View file

@ -29,11 +29,20 @@
#define LHLT_DELAY 0x50000 /* I/O delay between post codes on failure */
/*
* eax: BIST value
* mm0: low 32-bits of TSC value
* mm1: high 32-bits of TSC value
* Per FSP1.1 specs, following registers are preserved:
* EBX, EDI, ESI, EBP, MM0, MM1
*
* Shift values to release MM2.
* mm0 -> edi: BIST value
* mm1 -> mm0: low 32-bits of TSC value
* mm2 -> mm1: high 32-bits of TSC value
*/
movl %eax, %edi
movd %mm0, %edi
movd %mm1, %eax
movd %eax, %mm0
movd %mm2, %eax
movd %eax, %mm1
cache_as_ram:
post_code(0x20)

12
src/soc/intel/baytrail/romstage/cache_as_ram.inc
View file

@ -36,9 +36,6 @@
#define NoEvictMod_MSR 0x2e0
#define BBL_CR_CTL3_MSR 0x11e
/* Save the BIST result. */
movl %eax, %ebp
cache_as_ram:
post_code(0x20)
@ -183,14 +180,13 @@ addrsize_set_high:
movl %eax, %esp
/* Push the initial TSC value from boot block. The low 32 bits are
* in mm0, and the high 32 bits are in mm1. */
* in mm1, and the high 32 bits are in mm2. */
movd %mm2, %eax
pushl %eax
movd %mm1, %eax
pushl %eax
movd %mm0, %eax
pushl %eax
/* Restore the BIST result. */
movl %ebp, %eax
movl %esp, %ebp
movd %mm0, %eax
pushl %eax
before_romstage: