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Revamp Intel microcode update code

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- add GPLv2 + copyright header after talking to Ron
- "bits" in struct microcode served no real purpose but
  getting its address taken. Hence drop it
- use asm volatile instead of __asm__ volatile
- drop superfluous wrmsr (that seems to be harmless but
  is still wrong) in read_microcode_rev
- use u32 instead of unsigned int where appropriate
- make code usable both in bootblock and in ramstage
- drop ROMCC style print_debug statements
- drop microcode update copy in Sandybridge bootblock

Change-Id: Iec4d5c7bfac210194caf577e8d72446e6dfb4b86
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/928
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Stefan Reinauer
2012-04-25 22:58:23 +02:00
parent 05e740fc40
commit 3f8989ebbc
3 changed files with 71 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
src/cpu/intel/model_206ax/bootblock.c
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@ -27,94 +27,7 @@ static const uint32_t microcode_updates[] = {
#include "x06_microcode.h"
};
struct microcode {
u32 hdrver; /* Header Version */
u32 rev; /* Patch ID */
u32 date; /* DATE */
u32 sig; /* CPUID */
u32 cksum; /* Checksum */
u32 ldrver; /* Loader Version */
u32 pf; /* Platform ID */
u32 data_size; /* Data size */
u32 total_size; /* Total size */
u32 reserved[3];
u32 bits[1012];
};
static inline u32 read_microcode_rev(void)
{
/* Some Intel Cpus can be very finicky about the
* CPUID sequence used. So this is implemented in
* assembly so that it works reliably.
*/
msr_t msr;
__asm__ volatile (
"wrmsr\n\t"
"xorl %%eax, %%eax\n\t"
"xorl %%edx, %%edx\n\t"
"movl $0x8b, %%ecx\n\t"
"wrmsr\n\t"
"movl $0x01, %%eax\n\t"
"cpuid\n\t"
"movl $0x08b, %%ecx\n\t"
"rdmsr \n\t"
: /* outputs */
"=a" (msr.lo), "=d" (msr.hi)
: /* inputs */
: /* trashed */
"ecx"
);
return msr.hi;
}
void intel_update_microcode(const void *microcode_updates)
{
unsigned int eax;
unsigned int pf, rev, sig;
unsigned int x86_model, x86_family;
const struct microcode *m;
const char *c;
msr_t msr;
/* cpuid sets msr 0x8B iff a microcode update has been loaded. */
msr.lo = 0;
msr.hi = 0;
wrmsr(0x8B, msr);
eax = cpuid_eax(1);
msr = rdmsr(0x8B);
rev = msr.hi;
x86_model = (eax >>4) & 0x0f;
x86_family = (eax >>8) & 0x0f;
sig = eax;
pf = 0;
if ((x86_model >= 5)||(x86_family>6)) {
msr = rdmsr(0x17);
pf = 1 << ((msr.hi >> 18) & 7);
}
m = microcode_updates;
for(c = microcode_updates; m->hdrver; m = (const struct microcode *)c) {
if ((m->sig == sig) && (m->pf & pf)) {
unsigned int new_rev;
msr.lo = (unsigned long)(&m->bits) & 0xffffffff;
msr.hi = 0;
wrmsr(0x79, msr);
/* Read back the new microcode version */
new_rev = read_microcode_rev();
break;
}
if (m->total_size) {
c += m->total_size;
} else {
c += 2048;
}
}
}
#include <cpu/intel/microcode/microcode.c>
static void set_var_mtrr(
unsigned reg, unsigned base, unsigned size, unsigned type)