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Add spinlock to serialize Intel microcode updates 

Updating microcode on several threads in a core at once
can be harmful. Hence add a spinlock to make sure that
does not happen.

Change-Id: I0c9526b6194202ae7ab5c66361fe04ce137372cc
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1778
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Stefan Reinauer 2012-10-15 13:18:06 -07:00 committed by Ronald G. Minnich
parent 0a405bafc5
commit a42e2f4daa
1 changed files with 12 additions and 1 deletions
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13
src/cpu/intel/microcode/microcode.c
View File

@ -28,12 +28,16 @@
#include <cpu/x86/msr.h>
#include <cpu/intel/microcode.h>
#if CONFIG_CPU_MICROCODE_IN_CBFS
#ifdef __PRE_RAM__
#if CONFIG_CPU_MICROCODE_IN_CBFS
#include <arch/cbfs.h>
#endif
#else
#if CONFIG_CPU_MICROCODE_IN_CBFS
#include <cbfs.h>
#endif
#include <smp/spinlock.h>
DECLARE_SPIN_LOCK(microcode_lock)
#endif
struct microcode {
@ -112,6 +116,9 @@ void intel_update_microcode(const void *microcode_updates)
printk(BIOS_DEBUG, "microcode: sig=0x%x pf=0x%x revision=0x%x\n",
sig, pf, rev);
#endif
#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
spin_lock(&microcode_lock);
#endif
m = microcode_updates;
for(c = microcode_updates; m->hdrver; m = (const struct microcode *)c) {
@ -142,6 +149,10 @@ void intel_update_microcode(const void *microcode_updates)
c += 2048;
}
}
#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
spin_unlock(&microcode_lock);
#endif
}
#if CONFIG_CPU_MICROCODE_IN_CBFS