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cpu/intel/smm/gen1: Use correct MSR for model_6fx and model_1067x 

According to the "Intel® 64 and IA-32 Architectures Software Developer’s Manual"
the SMRR MSR are at a different offset for model_6fx and model_1067x.

This still need SMRR enabled and lock bit set in MSR_FEATURE_CONTROL.

Change-Id: I8ee8292ab038e58deb8c24745ec1a9b5da8c31a9
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/27585
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Arthur Heymans 2018-07-20 23:41:54 +02:00 committed by Patrick Georgi
parent e8d0c0092a
commit 06f818c932
2 changed files with 40 additions and 4 deletions
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36
src/cpu/intel/smm/gen1/smmrelocate.c
View File

@ -37,6 +37,10 @@
#define G_SMRAME (1 << 3)
#define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0))
#define IA32_FEATURE_CONTROL 0x3a
#define FEATURE_CONTROL_LOCK_BIT (1 << 0)
#define SMRR_ENABLE (1 << 3)
struct ied_header {
char signature[10];
u32 size;
@ -57,13 +61,33 @@ struct smm_relocation_params {
static struct smm_relocation_params smm_reloc_params;
static void *default_smm_area = NULL;
static inline void write_smrr(struct smm_relocation_params *relo_params)
static void write_smrr(struct smm_relocation_params *relo_params)
{
struct cpuinfo_x86 c;
printk(BIOS_DEBUG, "Writing SMRR. base = 0x%08x, mask=0x%08x\n",
relo_params->smrr_base.lo, relo_params->smrr_mask.lo);
/* Both model_6fx and model_1067x SMRR function slightly differently
from the rest. The MSR are at different location from the rest
and need to be explicitly enabled. */
get_fms(&c, cpuid_eax(1));
if (c.x86 == 6 && (c.x86_model == 0xf || c.x86_model == 0x17)) {
msr_t msr;
msr = rdmsr(IA32_FEATURE_CONTROL);
/* SMRR enabled and feature locked */
if (!((msr.lo & SMRR_ENABLE)
&& (msr.lo & FEATURE_CONTROL_LOCK_BIT))) {
printk(BIOS_WARNING,
"SMRR not enabled, skip writing SMRR...\n");
return;
}
wrmsr(MSR_SMRR_PHYS_BASE, relo_params->smrr_base);
wrmsr(MSR_SMRR_PHYS_MASK, relo_params->smrr_mask);
} else {
wrmsr(IA32_SMRR_PHYS_BASE, relo_params->smrr_base);
wrmsr(IA32_SMRR_PHYS_MASK, relo_params->smrr_mask);
}
}
/* The relocation work is actually performed in SMM context, but the code
* resides in the ramstage module. This occurs by trampolining from the default
@ -137,7 +161,15 @@ static void fill_in_relocation_params(struct smm_relocation_params *params)
params->smram_size -= CONFIG_SMM_RESERVED_SIZE;
/* SMRR has 32-bits of valid address aligned to 4KiB. */
params->smrr_base.lo = (params->smram_base & rmask) | MTRR_TYPE_WRBACK;
struct cpuinfo_x86 c;
/* On model_6fx and model_1067x bits [0:11] on smrr_base are reserved */
get_fms(&c, cpuid_eax(1));
if (c.x86 == 6 && (c.x86_model == 0xf || c.x86_model == 0x17))
params->smrr_base.lo = (params->smram_base & rmask);
else
params->smrr_base.lo = (params->smram_base & rmask)
| MTRR_TYPE_WRBACK;
params->smrr_base.hi = 0;
params->smrr_mask.lo = (~(tseg_size - 1) & rmask)
| MTRR_PHYS_MASK_VALID;

4
src/include/cpu/x86/mtrr.h
View File

@ -31,6 +31,10 @@
#define IA32_SMRR_PHYS_BASE 0x1f2
#define IA32_SMRR_PHYS_MASK 0x1f3
/* Specific to model_6fx and model_1067x */
#define MSR_SMRR_PHYS_BASE 0xa0
#define MSR_SMRR_PHYS_MASK 0xa1
#define MTRR_PHYS_BASE(reg) (0x200 + 2 * (reg))
#define MTRR_PHYS_MASK(reg) (MTRR_PHYS_BASE(reg) + 1)
#define MTRR_PHYS_MASK_VALID (1 << 11)