From c72f74e2780350f16795dc4d69145b9c87cb3e97 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 1 Jan 2015 16:18:14 -0700 Subject: [PATCH] x86: ivybridge: Update microcode early in boot At present the normal update (which happens much later) does not work. This seems to have something to do with the 'no eviction' mode in the CAR, or at least moving the microcode update after that causes it not to work. For now, do an update early on so that it definitely works. Also refuse to continue unless the microcode update check (later in boot) is successful. Signed-off-by: Simon Glass --- arch/x86/cpu/ivybridge/car.S | 16 ++++++++++++ arch/x86/cpu/ivybridge/cpu.c | 2 +- arch/x86/cpu/ivybridge/microcode_intel.c | 26 ++++++++++++------- arch/x86/dts/link.dts | 3 --- .../include/asm/arch-ivybridge/microcode.h | 6 +++++ 5 files changed, 40 insertions(+), 13 deletions(-) diff --git a/arch/x86/cpu/ivybridge/car.S b/arch/x86/cpu/ivybridge/car.S index d5f1acfe3d..9441666f5a 100644 --- a/arch/x86/cpu/ivybridge/car.S +++ b/arch/x86/cpu/ivybridge/car.S @@ -12,9 +12,11 @@ */ #include +#include #include #include #include +#include #define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg)) #define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1) @@ -45,6 +47,14 @@ car_init: movl $0xFEE00300, %esi movl %eax, (%esi) + /* TODO: Load microcode later - the 'no eviction' mode breaks this */ + movl $MSR_IA32_UCODE_WRITE, %ecx + xorl %edx, %edx + movl $_dt_ucode_base_size, %eax + movl (%eax), %eax + addl $UCODE_HEADER_LEN, %eax + wrmsr + post_code(POST_CAR_SIPI) /* Zero out all fixed range and variable range MTRRs */ movl $mtrr_table, %esi @@ -222,3 +232,9 @@ mtrr_table: .word 0x20C, 0x20D, 0x20E, 0x20F .word 0x210, 0x211, 0x212, 0x213 mtrr_table_end: + + .align 4 +_dt_ucode_base_size: + /* These next two fields are filled in by ifdtool */ + .long 0 /* microcode base */ + .long 0 /* microcode size */ diff --git a/arch/x86/cpu/ivybridge/cpu.c b/arch/x86/cpu/ivybridge/cpu.c index 0543e06aef..e9253100f6 100644 --- a/arch/x86/cpu/ivybridge/cpu.c +++ b/arch/x86/cpu/ivybridge/cpu.c @@ -263,7 +263,7 @@ int print_cpuinfo(void) enable_lapic(); ret = microcode_update_intel(); - if (ret && ret != -ENOENT && ret != -EEXIST) + if (ret) return ret; /* Enable upper 128bytes of CMOS */ diff --git a/arch/x86/cpu/ivybridge/microcode_intel.c b/arch/x86/cpu/ivybridge/microcode_intel.c index 08177510ab..2440a97c48 100644 --- a/arch/x86/cpu/ivybridge/microcode_intel.c +++ b/arch/x86/cpu/ivybridge/microcode_intel.c @@ -13,7 +13,9 @@ #include #include #include +#include #include +#include /** * struct microcode_update - standard microcode header from Intel @@ -40,8 +42,8 @@ static int microcode_decode_node(const void *blob, int node, update->data = fdt_getprop(blob, node, "data", &update->size); if (!update->data) return -EINVAL; - update->data += 48; - update->size -= 48; + update->data += UCODE_HEADER_LEN; + update->size -= UCODE_HEADER_LEN; update->header_version = fdtdec_get_int(blob, node, "intel,header-version", 0); @@ -71,15 +73,16 @@ static inline uint32_t microcode_read_rev(void) asm volatile ( "xorl %%eax, %%eax\n" "xorl %%edx, %%edx\n" - "movl $0x8b, %%ecx\n" + "movl %2, %%ecx\n" "wrmsr\n" "movl $0x01, %%eax\n" "cpuid\n" - "movl $0x8b, %%ecx\n" + "movl %2, %%ecx\n" "rdmsr\n" : /* outputs */ "=a" (low), "=d" (high) : /* inputs */ + "i" (MSR_IA32_UCODE_REV) : /* clobbers */ "ebx", "ecx" ); @@ -94,9 +97,9 @@ static void microcode_read_cpu(struct microcode_update *cpu) struct cpuid_result result; uint32_t low, high; - wrmsr(0x8b, 0, 0); + wrmsr(MSR_IA32_UCODE_REV, 0, 0); result = cpuid(1); - rdmsr(0x8b, low, cpu->update_revision); + rdmsr(MSR_IA32_UCODE_REV, low, cpu->update_revision); x86_model = (result.eax >> 4) & 0x0f; x86_family = (result.eax >> 8) & 0x0f; cpu->processor_signature = result.eax; @@ -120,6 +123,7 @@ int microcode_update_intel(void) int count; int node; int ret; + int rev; microcode_read_cpu(&cpu); node = 0; @@ -147,12 +151,16 @@ int microcode_update_intel(void) skipped++; continue; } - ret = microcode_read_rev(); - wrmsr(0x79, (ulong)update.data, 0); + wrmsr(MSR_IA32_UCODE_WRITE, (ulong)update.data, 0); + rev = microcode_read_rev(); debug("microcode: updated to revision 0x%x date=%04x-%02x-%02x\n", - microcode_read_rev(), update.date_code & 0xffff, + rev, update.date_code & 0xffff, (update.date_code >> 24) & 0xff, (update.date_code >> 16) & 0xff); + if (update.update_revision != rev) { + printf("Microcode update failed\n"); + return -EFAULT; + } count++; } while (1); } diff --git a/arch/x86/dts/link.dts b/arch/x86/dts/link.dts index 107af60004..9490b169fb 100644 --- a/arch/x86/dts/link.dts +++ b/arch/x86/dts/link.dts @@ -209,9 +209,6 @@ microcode { update@0 { -#include "microcode/m12206a7_00000029.dtsi" - }; - update@1 { #include "microcode/m12306a9_0000001b.dtsi" }; }; diff --git a/arch/x86/include/asm/arch-ivybridge/microcode.h b/arch/x86/include/asm/arch-ivybridge/microcode.h index bc9b87c44c..b868283761 100644 --- a/arch/x86/include/asm/arch-ivybridge/microcode.h +++ b/arch/x86/include/asm/arch-ivybridge/microcode.h @@ -7,6 +7,11 @@ #ifndef __ASM_ARCH_MICROCODE_H #define __ASM_ARCH_MICROCODE_H +/* Length of the public header on Intel microcode blobs */ +#define UCODE_HEADER_LEN 0x30 + +#ifndef __ASSEMBLY__ + /** * microcode_update_intel() - Apply microcode updates * @@ -16,5 +21,6 @@ * not updates were found, -EINVAL if an update was invalid */ int microcode_update_intel(void); +#endif /* __ASSEMBLY__ */ #endif -- 2.39.5