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authorAaron Durbin <adurbin@chromium.org>2013-01-15 15:15:32 -0600
committerRonald G. Minnich <rminnich@gmail.com>2013-03-19 05:11:50 +0100
commit98ffb426f40593f930388c006f8058c199defff4 (patch)
tree2cf6b6e95ceede3a8c8773f80bb2be48d4046c31 /src/cpu
parent3c734bb355b6cf15e61e3bc8755f622d4117e7c2 (diff)
downloadcoreboot-98ffb426f40593f930388c006f8058c199defff4.tar.xz
intel microcode: split up microcode loading stages
This patch only applies to CONFIG_MICROCODE_IN_CBFS. The intel microcode update routine would always walk the CBFS for the microcode file. Then it would loop through the whole file looking for a match then load the microcode. This process was maintained for intel_update_microcode_from_cbfs(), however 2 new functions were exported: 1. const void *intel_microcode_find(void) 2. void intel_microcode_load_unlocked(const void *microcode_patch) The first locates a matching microcode while the second loads that mircocode. These new functions can then be used to cache the found microcode blob w/o having to re-walk the CBFS. Booted baskingridge board to Linux and noted that all microcode revisions match on all the CPUs. Change-Id: Ifde3f3e5c100911c4f984dd56d36664a8acdf7d5 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/2778 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/cpu')
-rw-r--r--src/cpu/intel/microcode/microcode.c128
1 files changed, 110 insertions, 18 deletions
diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c
index 713a6df19b..d908c25ec0 100644
--- a/src/cpu/intel/microcode/microcode.c
+++ b/src/cpu/intel/microcode/microcode.c
@@ -82,8 +82,117 @@ static inline u32 read_microcode_rev(void)
}
#if CONFIG_CPU_MICROCODE_IN_CBFS
-static
+
+#define MICROCODE_CBFS_FILE "cpu_microcode_blob.bin"
+
+void intel_microcode_load_unlocked(const void *microcode_patch)
+{
+ u32 current_rev;
+ msr_t msr;
+ const struct microcode *m = microcode_patch;
+
+ if (!m)
+ return;
+
+ current_rev = read_microcode_rev();
+
+ /* No use loading the same revision. */
+ if (current_rev == m->rev)
+ return;
+
+ msr.lo = (unsigned long)m + sizeof(struct microcode);
+ msr.hi = 0;
+ wrmsr(0x79, msr);
+
+#if !defined(__ROMCC__)
+ printk(BIOS_DEBUG, "microcode: updated to revision "
+ "0x%x date=%04x-%02x-%02x\n", read_microcode_rev(),
+ m->date & 0xffff, (m->date >> 24) & 0xff,
+ (m->date >> 16) & 0xff);
+#endif
+}
+
+const void *intel_microcode_find(void)
+{
+ void *microcode_updates;
+ u32 eax;
+ u32 pf, rev, sig;
+ unsigned int x86_model, x86_family;
+ const struct microcode *m;
+ const char *c;
+ msr_t msr;
+
+#ifdef __PRE_RAM__
+ microcode_updates = walkcbfs((char *) MICROCODE_CBFS_FILE);
+#else
+ microcode_updates = cbfs_get_file_content(CBFS_DEFAULT_MEDIA,
+ MICROCODE_CBFS_FILE,
+ CBFS_TYPE_MICROCODE);
#endif
+
+ if (!microcode_updates)
+ return microcode_updates;
+
+ /* 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);
+ }
+#if !defined(__ROMCC__)
+ /* If this code is compiled with ROMCC we're probably in
+ * the bootblock and don't have console output yet.
+ */
+ printk(BIOS_DEBUG, "microcode: sig=0x%x pf=0x%x revision=0x%x\n",
+ sig, pf, rev);
+#endif
+
+ m = microcode_updates;
+ for(c = microcode_updates; m->hdrver; m = (const struct microcode *)c) {
+ if ((m->sig == sig) && (m->pf & pf))
+ return m;
+
+ if (m->total_size) {
+ c += m->total_size;
+ } else {
+#if !defined(__ROMCC__)
+ printk(BIOS_WARNING, "Microcode has no valid size field!\n");
+#endif
+ c += 2048;
+ }
+ }
+
+ /* ROMCC doesn't like NULL. */
+ return (void *)0;
+}
+
+void intel_update_microcode_from_cbfs(void)
+{
+ const void *patch = intel_microcode_find();
+
+#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
+ spin_lock(&microcode_lock);
+#endif
+
+ intel_microcode_load_unlocked(patch);
+
+#if !defined(__ROMCC__) && !defined(__PRE_RAM__)
+ spin_unlock(&microcode_lock);
+#endif
+}
+
+#else /* !CONFIG_CPU_MICROCODE_IN_CBFS */
+
void intel_update_microcode(const void *microcode_updates)
{
u32 eax;
@@ -155,21 +264,4 @@ void intel_update_microcode(const void *microcode_updates)
#endif
}
-#if CONFIG_CPU_MICROCODE_IN_CBFS
-
-#define MICROCODE_CBFS_FILE "cpu_microcode_blob.bin"
-
-void intel_update_microcode_from_cbfs(void)
-{
- void *microcode_blob;
-
-#ifdef __PRE_RAM__
- microcode_blob = walkcbfs((char *) MICROCODE_CBFS_FILE);
-#else
- microcode_blob = cbfs_get_file_content(CBFS_DEFAULT_MEDIA,
- MICROCODE_CBFS_FILE,
- CBFS_TYPE_MICROCODE);
-#endif
- intel_update_microcode(microcode_blob);
-}
#endif