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-rw-r--r--Documentation/x86/early-microcode.txt43
-rw-r--r--arch/x86/Kconfig18
-rw-r--r--arch/x86/include/asm/microcode.h14
-rw-r--r--arch/x86/include/asm/microcode_intel.h85
-rw-r--r--arch/x86/include/asm/processor.h8
-rw-r--r--arch/x86/include/asm/tlbflush.h18
-rw-r--r--arch/x86/kernel/Makefile3
-rw-r--r--arch/x86/kernel/cpu/common.c17
-rw-r--r--arch/x86/kernel/head64.c6
-rw-r--r--arch/x86/kernel/head_32.S11
-rw-r--r--arch/x86/kernel/microcode_core.c7
-rw-r--r--arch/x86/kernel/microcode_core_early.c76
-rw-r--r--arch/x86/kernel/microcode_intel.c198
-rw-r--r--arch/x86/kernel/microcode_intel_early.c796
-rw-r--r--arch/x86/kernel/microcode_intel_lib.c174
-rw-r--r--arch/x86/mm/init.c10
16 files changed, 1301 insertions, 183 deletions
diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt
new file mode 100644
index 000000000000..4aaf0dfb0cb8
--- /dev/null
+++ b/Documentation/x86/early-microcode.txt
@@ -0,0 +1,43 @@
1Early load microcode
2====================
3By Fenghua Yu <fenghua.yu@intel.com>
4
5Kernel can update microcode in early phase of boot time. Loading microcode early
6can fix CPU issues before they are observed during kernel boot time.
7
8Microcode is stored in an initrd file. The microcode is read from the initrd
9file and loaded to CPUs during boot time.
10
11The format of the combined initrd image is microcode in cpio format followed by
12the initrd image (maybe compressed). Kernel parses the combined initrd image
13during boot time. The microcode file in cpio name space is:
14kernel/x86/microcode/GenuineIntel.bin
15
16During BSP boot (before SMP starts), if the kernel finds the microcode file in
17the initrd file, it parses the microcode and saves matching microcode in memory.
18If matching microcode is found, it will be uploaded in BSP and later on in all
19APs.
20
21The cached microcode patch is applied when CPUs resume from a sleep state.
22
23There are two legacy user space interfaces to load microcode, either through
24/dev/cpu/microcode or through /sys/devices/system/cpu/microcode/reload file
25in sysfs.
26
27In addition to these two legacy methods, the early loading method described
28here is the third method with which microcode can be uploaded to a system's
29CPUs.
30
31The following example script shows how to generate a new combined initrd file in
32/boot/initrd-3.5.0.ucode.img with original microcode microcode.bin and
33original initrd image /boot/initrd-3.5.0.img.
34
35mkdir initrd
36cd initrd
37mkdir kernel
38mkdir kernel/x86
39mkdir kernel/x86/microcode
40cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin
41find .|cpio -oc >../ucode.cpio
42cd ..
43cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ff0e5f3c844e..4ebc7a6e6724 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1054,6 +1054,24 @@ config MICROCODE_OLD_INTERFACE
1054 def_bool y 1054 def_bool y
1055 depends on MICROCODE 1055 depends on MICROCODE
1056 1056
1057config MICROCODE_INTEL_LIB
1058 def_bool y
1059 depends on MICROCODE_INTEL
1060
1061config MICROCODE_INTEL_EARLY
1062 bool "Early load microcode"
1063 depends on MICROCODE_INTEL && BLK_DEV_INITRD
1064 default y
1065 help
1066 This option provides functionality to read additional microcode data
1067 at the beginning of initrd image. The data tells kernel to load
1068 microcode to CPU's as early as possible. No functional change if no
1069 microcode data is glued to the initrd, therefore it's safe to say Y.
1070
1071config MICROCODE_EARLY
1072 def_bool y
1073 depends on MICROCODE_INTEL_EARLY
1074
1057config X86_MSR 1075config X86_MSR
1058 tristate "/dev/cpu/*/msr - Model-specific register support" 1076 tristate "/dev/cpu/*/msr - Model-specific register support"
1059 ---help--- 1077 ---help---
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 43d921b4752c..6825e2efd1b4 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -57,4 +57,18 @@ static inline struct microcode_ops * __init init_amd_microcode(void)
57static inline void __exit exit_amd_microcode(void) {} 57static inline void __exit exit_amd_microcode(void) {}
58#endif 58#endif
59 59
60#ifdef CONFIG_MICROCODE_EARLY
61#define MAX_UCODE_COUNT 128
62extern void __init load_ucode_bsp(void);
63extern __init void load_ucode_ap(void);
64extern int __init save_microcode_in_initrd(void);
65#else
66static inline void __init load_ucode_bsp(void) {}
67static inline __init void load_ucode_ap(void) {}
68static inline int __init save_microcode_in_initrd(void)
69{
70 return 0;
71}
72#endif
73
60#endif /* _ASM_X86_MICROCODE_H */ 74#endif /* _ASM_X86_MICROCODE_H */
diff --git a/arch/x86/include/asm/microcode_intel.h b/arch/x86/include/asm/microcode_intel.h
new file mode 100644
index 000000000000..5356f927d411
--- /dev/null
+++ b/arch/x86/include/asm/microcode_intel.h
@@ -0,0 +1,85 @@
1#ifndef _ASM_X86_MICROCODE_INTEL_H
2#define _ASM_X86_MICROCODE_INTEL_H
3
4#include <asm/microcode.h>
5
6struct microcode_header_intel {
7 unsigned int hdrver;
8 unsigned int rev;
9 unsigned int date;
10 unsigned int sig;
11 unsigned int cksum;
12 unsigned int ldrver;
13 unsigned int pf;
14 unsigned int datasize;
15 unsigned int totalsize;
16 unsigned int reserved[3];
17};
18
19struct microcode_intel {
20 struct microcode_header_intel hdr;
21 unsigned int bits[0];
22};
23
24/* microcode format is extended from prescott processors */
25struct extended_signature {
26 unsigned int sig;
27 unsigned int pf;
28 unsigned int cksum;
29};
30
31struct extended_sigtable {
32 unsigned int count;
33 unsigned int cksum;
34 unsigned int reserved[3];
35 struct extended_signature sigs[0];
36};
37
38#define DEFAULT_UCODE_DATASIZE (2000)
39#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
40#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
41#define EXT_HEADER_SIZE (sizeof(struct extended_sigtable))
42#define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature))
43#define DWSIZE (sizeof(u32))
44
45#define get_totalsize(mc) \
46 (((struct microcode_intel *)mc)->hdr.totalsize ? \
47 ((struct microcode_intel *)mc)->hdr.totalsize : \
48 DEFAULT_UCODE_TOTALSIZE)
49
50#define get_datasize(mc) \
51 (((struct microcode_intel *)mc)->hdr.datasize ? \
52 ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
53
54#define sigmatch(s1, s2, p1, p2) \
55 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
56
57#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
58
59extern int
60get_matching_microcode(unsigned int csig, int cpf, void *mc, int rev);
61extern int microcode_sanity_check(void *mc, int print_err);
62extern int get_matching_sig(unsigned int csig, int cpf, void *mc, int rev);
63extern int
64update_match_revision(struct microcode_header_intel *mc_header, int rev);
65
66#ifdef CONFIG_MICROCODE_INTEL_EARLY
67extern void __init load_ucode_intel_bsp(void);
68extern void __cpuinit load_ucode_intel_ap(void);
69extern void show_ucode_info_early(void);
70#else
71static inline __init void load_ucode_intel_bsp(void) {}
72static inline __cpuinit void load_ucode_intel_ap(void) {}
73static inline void show_ucode_info_early(void) {}
74#endif
75
76#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
77extern int save_mc_for_early(u8 *mc);
78#else
79static inline int save_mc_for_early(u8 *mc)
80{
81 return 0;
82}
83#endif
84
85#endif /* _ASM_X86_MICROCODE_INTEL_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 8277941cbe99..3270116b1488 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -180,6 +180,14 @@ extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
180extern void detect_extended_topology(struct cpuinfo_x86 *c); 180extern void detect_extended_topology(struct cpuinfo_x86 *c);
181extern void detect_ht(struct cpuinfo_x86 *c); 181extern void detect_ht(struct cpuinfo_x86 *c);
182 182
183#ifdef CONFIG_X86_32
184extern int have_cpuid_p(void);
185#else
186static inline int have_cpuid_p(void)
187{
188 return 1;
189}
190#endif
183static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, 191static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
184 unsigned int *ecx, unsigned int *edx) 192 unsigned int *ecx, unsigned int *edx)
185{ 193{
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 0fee48e279cc..50a7fc0f824a 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -20,10 +20,20 @@ static inline void __native_flush_tlb(void)
20 native_write_cr3(native_read_cr3()); 20 native_write_cr3(native_read_cr3());
21} 21}
22 22
23static inline void __native_flush_tlb_global_irq_disabled(void)
24{
25 unsigned long cr4;
26
27 cr4 = native_read_cr4();
28 /* clear PGE */
29 native_write_cr4(cr4 & ~X86_CR4_PGE);
30 /* write old PGE again and flush TLBs */
31 native_write_cr4(cr4);
32}
33
23static inline void __native_flush_tlb_global(void) 34static inline void __native_flush_tlb_global(void)
24{ 35{
25 unsigned long flags; 36 unsigned long flags;
26 unsigned long cr4;
27 37
28 /* 38 /*
29 * Read-modify-write to CR4 - protect it from preemption and 39 * Read-modify-write to CR4 - protect it from preemption and
@@ -32,11 +42,7 @@ static inline void __native_flush_tlb_global(void)
32 */ 42 */
33 raw_local_irq_save(flags); 43 raw_local_irq_save(flags);
34 44
35 cr4 = native_read_cr4(); 45 __native_flush_tlb_global_irq_disabled();
36 /* clear PGE */
37 native_write_cr4(cr4 & ~X86_CR4_PGE);
38 /* write old PGE again and flush TLBs */
39 native_write_cr4(cr4);
40 46
41 raw_local_irq_restore(flags); 47 raw_local_irq_restore(flags);
42} 48}
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index ac3b3d002833..7bd3bd310106 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -87,6 +87,9 @@ obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
87 87
88obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o 88obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
89 89
90obj-$(CONFIG_MICROCODE_EARLY) += microcode_core_early.o
91obj-$(CONFIG_MICROCODE_INTEL_EARLY) += microcode_intel_early.o
92obj-$(CONFIG_MICROCODE_INTEL_LIB) += microcode_intel_lib.o
90microcode-y := microcode_core.o 93microcode-y := microcode_core.o
91microcode-$(CONFIG_MICROCODE_INTEL) += microcode_intel.o 94microcode-$(CONFIG_MICROCODE_INTEL) += microcode_intel.o
92microcode-$(CONFIG_MICROCODE_AMD) += microcode_amd.o 95microcode-$(CONFIG_MICROCODE_AMD) += microcode_amd.o
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9c3ab43a6954..d814772c5bed 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -37,6 +37,8 @@
37#include <asm/mce.h> 37#include <asm/mce.h>
38#include <asm/msr.h> 38#include <asm/msr.h>
39#include <asm/pat.h> 39#include <asm/pat.h>
40#include <asm/microcode.h>
41#include <asm/microcode_intel.h>
40 42
41#ifdef CONFIG_X86_LOCAL_APIC 43#ifdef CONFIG_X86_LOCAL_APIC
42#include <asm/uv/uv.h> 44#include <asm/uv/uv.h>
@@ -213,7 +215,7 @@ static inline int flag_is_changeable_p(u32 flag)
213} 215}
214 216
215/* Probe for the CPUID instruction */ 217/* Probe for the CPUID instruction */
216static int __cpuinit have_cpuid_p(void) 218int __cpuinit have_cpuid_p(void)
217{ 219{
218 return flag_is_changeable_p(X86_EFLAGS_ID); 220 return flag_is_changeable_p(X86_EFLAGS_ID);
219} 221}
@@ -249,11 +251,6 @@ static inline int flag_is_changeable_p(u32 flag)
249{ 251{
250 return 1; 252 return 1;
251} 253}
252/* Probe for the CPUID instruction */
253static inline int have_cpuid_p(void)
254{
255 return 1;
256}
257static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c) 254static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
258{ 255{
259} 256}
@@ -1223,6 +1220,12 @@ void __cpuinit cpu_init(void)
1223 int cpu; 1220 int cpu;
1224 int i; 1221 int i;
1225 1222
1223 /*
1224 * Load microcode on this cpu if a valid microcode is available.
1225 * This is early microcode loading procedure.
1226 */
1227 load_ucode_ap();
1228
1226 cpu = stack_smp_processor_id(); 1229 cpu = stack_smp_processor_id();
1227 t = &per_cpu(init_tss, cpu); 1230 t = &per_cpu(init_tss, cpu);
1228 oist = &per_cpu(orig_ist, cpu); 1231 oist = &per_cpu(orig_ist, cpu);
@@ -1314,6 +1317,8 @@ void __cpuinit cpu_init(void)
1314 struct tss_struct *t = &per_cpu(init_tss, cpu); 1317 struct tss_struct *t = &per_cpu(init_tss, cpu);
1315 struct thread_struct *thread = &curr->thread; 1318 struct thread_struct *thread = &curr->thread;
1316 1319
1320 show_ucode_info_early();
1321
1317 if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) { 1322 if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) {
1318 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu); 1323 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
1319 for (;;) 1324 for (;;)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 2590025e52c2..c5e403f6d869 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -26,6 +26,7 @@
26#include <asm/e820.h> 26#include <asm/e820.h>
27#include <asm/bios_ebda.h> 27#include <asm/bios_ebda.h>
28#include <asm/bootparam_utils.h> 28#include <asm/bootparam_utils.h>
29#include <asm/microcode.h>
29 30
30/* 31/*
31 * Manage page tables very early on. 32 * Manage page tables very early on.
@@ -165,6 +166,11 @@ void __init x86_64_start_kernel(char * real_mode_data)
165 166
166 copy_bootdata(__va(real_mode_data)); 167 copy_bootdata(__va(real_mode_data));
167 168
169 /*
170 * Load microcode early on BSP.
171 */
172 load_ucode_bsp();
173
168 if (console_loglevel == 10) 174 if (console_loglevel == 10)
169 early_printk("Kernel alive\n"); 175 early_printk("Kernel alive\n");
170 176
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 3c3f58a0808f..73afd11799ca 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -144,6 +144,11 @@ ENTRY(startup_32)
144 movl %eax, pa(olpc_ofw_pgd) 144 movl %eax, pa(olpc_ofw_pgd)
145#endif 145#endif
146 146
147#ifdef CONFIG_MICROCODE_EARLY
148 /* Early load ucode on BSP. */
149 call load_ucode_bsp
150#endif
151
147/* 152/*
148 * Initialize page tables. This creates a PDE and a set of page 153 * Initialize page tables. This creates a PDE and a set of page
149 * tables, which are located immediately beyond __brk_base. The variable 154 * tables, which are located immediately beyond __brk_base. The variable
@@ -299,6 +304,12 @@ ENTRY(startup_32_smp)
299 movl %eax,%ss 304 movl %eax,%ss
300 leal -__PAGE_OFFSET(%ecx),%esp 305 leal -__PAGE_OFFSET(%ecx),%esp
301 306
307#ifdef CONFIG_MICROCODE_EARLY
308 /* Early load ucode on AP. */
309 call load_ucode_ap
310#endif
311
312
302default_entry: 313default_entry:
303#define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \ 314#define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \
304 X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \ 315 X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index 3a04b224d0c0..22db92bbdf1a 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -364,10 +364,7 @@ static struct attribute_group mc_attr_group = {
364 364
365static void microcode_fini_cpu(int cpu) 365static void microcode_fini_cpu(int cpu)
366{ 366{
367 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
368
369 microcode_ops->microcode_fini_cpu(cpu); 367 microcode_ops->microcode_fini_cpu(cpu);
370 uci->valid = 0;
371} 368}
372 369
373static enum ucode_state microcode_resume_cpu(int cpu) 370static enum ucode_state microcode_resume_cpu(int cpu)
@@ -383,6 +380,10 @@ static enum ucode_state microcode_resume_cpu(int cpu)
383static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw) 380static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
384{ 381{
385 enum ucode_state ustate; 382 enum ucode_state ustate;
383 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
384
385 if (uci && uci->valid)
386 return UCODE_OK;
386 387
387 if (collect_cpu_info(cpu)) 388 if (collect_cpu_info(cpu))
388 return UCODE_ERROR; 389 return UCODE_ERROR;
diff --git a/arch/x86/kernel/microcode_core_early.c b/arch/x86/kernel/microcode_core_early.c
new file mode 100644
index 000000000000..577db8417d15
--- /dev/null
+++ b/arch/x86/kernel/microcode_core_early.c
@@ -0,0 +1,76 @@
1/*
2 * X86 CPU microcode early update for Linux
3 *
4 * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
5 * H Peter Anvin" <hpa@zytor.com>
6 *
7 * This driver allows to early upgrade microcode on Intel processors
8 * belonging to IA-32 family - PentiumPro, Pentium II,
9 * Pentium III, Xeon, Pentium 4, etc.
10 *
11 * Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
12 * Software Developer's Manual.
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 */
19#include <linux/module.h>
20#include <asm/microcode_intel.h>
21#include <asm/processor.h>
22
23#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
24#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
25#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
26#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
27#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
28#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
29#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
30
31#define CPUID_IS(a, b, c, ebx, ecx, edx) \
32 (!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
33
34/*
35 * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
36 * x86_vendor() gets vendor id for BSP.
37 *
38 * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
39 * coding, we still use x86_vendor() to get vendor id for AP.
40 *
41 * x86_vendor() gets vendor information directly through cpuid.
42 */
43static int __cpuinit x86_vendor(void)
44{
45 u32 eax = 0x00000000;
46 u32 ebx, ecx = 0, edx;
47
48 if (!have_cpuid_p())
49 return X86_VENDOR_UNKNOWN;
50
51 native_cpuid(&eax, &ebx, &ecx, &edx);
52
53 if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
54 return X86_VENDOR_INTEL;
55
56 if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
57 return X86_VENDOR_AMD;
58
59 return X86_VENDOR_UNKNOWN;
60}
61
62void __init load_ucode_bsp(void)
63{
64 int vendor = x86_vendor();
65
66 if (vendor == X86_VENDOR_INTEL)
67 load_ucode_intel_bsp();
68}
69
70void __cpuinit load_ucode_ap(void)
71{
72 int vendor = x86_vendor();
73
74 if (vendor == X86_VENDOR_INTEL)
75 load_ucode_intel_ap();
76}
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 3544aed39338..5fb2cebf556b 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -79,7 +79,7 @@
79#include <linux/module.h> 79#include <linux/module.h>
80#include <linux/vmalloc.h> 80#include <linux/vmalloc.h>
81 81
82#include <asm/microcode.h> 82#include <asm/microcode_intel.h>
83#include <asm/processor.h> 83#include <asm/processor.h>
84#include <asm/msr.h> 84#include <asm/msr.h>
85 85
@@ -87,59 +87,6 @@ MODULE_DESCRIPTION("Microcode Update Driver");
87MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 87MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
88MODULE_LICENSE("GPL"); 88MODULE_LICENSE("GPL");
89 89
90struct microcode_header_intel {
91 unsigned int hdrver;
92 unsigned int rev;
93 unsigned int date;
94 unsigned int sig;
95 unsigned int cksum;
96 unsigned int ldrver;
97 unsigned int pf;
98 unsigned int datasize;
99 unsigned int totalsize;
100 unsigned int reserved[3];
101};
102
103struct microcode_intel {
104 struct microcode_header_intel hdr;
105 unsigned int bits[0];
106};
107
108/* microcode format is extended from prescott processors */
109struct extended_signature {
110 unsigned int sig;
111 unsigned int pf;
112 unsigned int cksum;
113};
114
115struct extended_sigtable {
116 unsigned int count;
117 unsigned int cksum;
118 unsigned int reserved[3];
119 struct extended_signature sigs[0];
120};
121
122#define DEFAULT_UCODE_DATASIZE (2000)
123#define MC_HEADER_SIZE (sizeof(struct microcode_header_intel))
124#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
125#define EXT_HEADER_SIZE (sizeof(struct extended_sigtable))
126#define EXT_SIGNATURE_SIZE (sizeof(struct extended_signature))
127#define DWSIZE (sizeof(u32))
128
129#define get_totalsize(mc) \
130 (((struct microcode_intel *)mc)->hdr.totalsize ? \
131 ((struct microcode_intel *)mc)->hdr.totalsize : \
132 DEFAULT_UCODE_TOTALSIZE)
133
134#define get_datasize(mc) \
135 (((struct microcode_intel *)mc)->hdr.datasize ? \
136 ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
137
138#define sigmatch(s1, s2, p1, p2) \
139 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
140
141#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
142
143static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) 90static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
144{ 91{
145 struct cpuinfo_x86 *c = &cpu_data(cpu_num); 92 struct cpuinfo_x86 *c = &cpu_data(cpu_num);
@@ -162,128 +109,25 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
162 return 0; 109 return 0;
163} 110}
164 111
165static inline int update_match_cpu(struct cpu_signature *csig, int sig, int pf)
166{
167 return (!sigmatch(sig, csig->sig, pf, csig->pf)) ? 0 : 1;
168}
169
170static inline int
171update_match_revision(struct microcode_header_intel *mc_header, int rev)
172{
173 return (mc_header->rev <= rev) ? 0 : 1;
174}
175
176static int microcode_sanity_check(void *mc)
177{
178 unsigned long total_size, data_size, ext_table_size;
179 struct microcode_header_intel *mc_header = mc;
180 struct extended_sigtable *ext_header = NULL;
181 int sum, orig_sum, ext_sigcount = 0, i;
182 struct extended_signature *ext_sig;
183
184 total_size = get_totalsize(mc_header);
185 data_size = get_datasize(mc_header);
186
187 if (data_size + MC_HEADER_SIZE > total_size) {
188 pr_err("error! Bad data size in microcode data file\n");
189 return -EINVAL;
190 }
191
192 if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
193 pr_err("error! Unknown microcode update format\n");
194 return -EINVAL;
195 }
196 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
197 if (ext_table_size) {
198 if ((ext_table_size < EXT_HEADER_SIZE)
199 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
200 pr_err("error! Small exttable size in microcode data file\n");
201 return -EINVAL;
202 }
203 ext_header = mc + MC_HEADER_SIZE + data_size;
204 if (ext_table_size != exttable_size(ext_header)) {
205 pr_err("error! Bad exttable size in microcode data file\n");
206 return -EFAULT;
207 }
208 ext_sigcount = ext_header->count;
209 }
210
211 /* check extended table checksum */
212 if (ext_table_size) {
213 int ext_table_sum = 0;
214 int *ext_tablep = (int *)ext_header;
215
216 i = ext_table_size / DWSIZE;
217 while (i--)
218 ext_table_sum += ext_tablep[i];
219 if (ext_table_sum) {
220 pr_warning("aborting, bad extended signature table checksum\n");
221 return -EINVAL;
222 }
223 }
224
225 /* calculate the checksum */
226 orig_sum = 0;
227 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
228 while (i--)
229 orig_sum += ((int *)mc)[i];
230 if (orig_sum) {
231 pr_err("aborting, bad checksum\n");
232 return -EINVAL;
233 }
234 if (!ext_table_size)
235 return 0;
236 /* check extended signature checksum */
237 for (i = 0; i < ext_sigcount; i++) {
238 ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
239 EXT_SIGNATURE_SIZE * i;
240 sum = orig_sum
241 - (mc_header->sig + mc_header->pf + mc_header->cksum)
242 + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
243 if (sum) {
244 pr_err("aborting, bad checksum\n");
245 return -EINVAL;
246 }
247 }
248 return 0;
249}
250
251/* 112/*
252 * return 0 - no update found 113 * return 0 - no update found
253 * return 1 - found update 114 * return 1 - found update
254 */ 115 */
255static int 116static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
256get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
257{ 117{
258 struct microcode_header_intel *mc_header = mc; 118 struct cpu_signature cpu_sig;
259 struct extended_sigtable *ext_header; 119 unsigned int csig, cpf, crev;
260 unsigned long total_size = get_totalsize(mc_header);
261 int ext_sigcount, i;
262 struct extended_signature *ext_sig;
263
264 if (!update_match_revision(mc_header, rev))
265 return 0;
266
267 if (update_match_cpu(cpu_sig, mc_header->sig, mc_header->pf))
268 return 1;
269 120
270 /* Look for ext. headers: */ 121 collect_cpu_info(cpu, &cpu_sig);
271 if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
272 return 0;
273 122
274 ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE; 123 csig = cpu_sig.sig;
275 ext_sigcount = ext_header->count; 124 cpf = cpu_sig.pf;
276 ext_sig = (void *)ext_header + EXT_HEADER_SIZE; 125 crev = cpu_sig.rev;
277 126
278 for (i = 0; i < ext_sigcount; i++) { 127 return get_matching_microcode(csig, cpf, mc_intel, crev);
279 if (update_match_cpu(cpu_sig, ext_sig->sig, ext_sig->pf))
280 return 1;
281 ext_sig++;
282 }
283 return 0;
284} 128}
285 129
286static int apply_microcode(int cpu) 130int apply_microcode(int cpu)
287{ 131{
288 struct microcode_intel *mc_intel; 132 struct microcode_intel *mc_intel;
289 struct ucode_cpu_info *uci; 133 struct ucode_cpu_info *uci;
@@ -300,6 +144,14 @@ static int apply_microcode(int cpu)
300 if (mc_intel == NULL) 144 if (mc_intel == NULL)
301 return 0; 145 return 0;
302 146
147 /*
148 * Microcode on this CPU could be updated earlier. Only apply the
149 * microcode patch in mc_intel when it is newer than the one on this
150 * CPU.
151 */
152 if (get_matching_mc(mc_intel, cpu) == 0)
153 return 0;
154
303 /* write microcode via MSR 0x79 */ 155 /* write microcode via MSR 0x79 */
304 wrmsr(MSR_IA32_UCODE_WRITE, 156 wrmsr(MSR_IA32_UCODE_WRITE,
305 (unsigned long) mc_intel->bits, 157 (unsigned long) mc_intel->bits,
@@ -338,6 +190,7 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
338 unsigned int leftover = size; 190 unsigned int leftover = size;
339 enum ucode_state state = UCODE_OK; 191 enum ucode_state state = UCODE_OK;
340 unsigned int curr_mc_size = 0; 192 unsigned int curr_mc_size = 0;
193 unsigned int csig, cpf;
341 194
342 while (leftover) { 195 while (leftover) {
343 struct microcode_header_intel mc_header; 196 struct microcode_header_intel mc_header;
@@ -362,11 +215,13 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
362 } 215 }
363 216
364 if (get_ucode_data(mc, ucode_ptr, mc_size) || 217 if (get_ucode_data(mc, ucode_ptr, mc_size) ||
365 microcode_sanity_check(mc) < 0) { 218 microcode_sanity_check(mc, 1) < 0) {
366 break; 219 break;
367 } 220 }
368 221
369 if (get_matching_microcode(&uci->cpu_sig, mc, new_rev)) { 222 csig = uci->cpu_sig.sig;
223 cpf = uci->cpu_sig.pf;
224 if (get_matching_microcode(csig, cpf, mc, new_rev)) {
370 vfree(new_mc); 225 vfree(new_mc);
371 new_rev = mc_header.rev; 226 new_rev = mc_header.rev;
372 new_mc = mc; 227 new_mc = mc;
@@ -393,6 +248,13 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
393 vfree(uci->mc); 248 vfree(uci->mc);
394 uci->mc = (struct microcode_intel *)new_mc; 249 uci->mc = (struct microcode_intel *)new_mc;
395 250
251 /*
252 * If early loading microcode is supported, save this mc into
253 * permanent memory. So it will be loaded early when a CPU is hot added
254 * or resumes.
255 */
256 save_mc_for_early(new_mc);
257
396 pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n", 258 pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
397 cpu, new_rev, uci->cpu_sig.rev); 259 cpu, new_rev, uci->cpu_sig.rev);
398out: 260out:
diff --git a/arch/x86/kernel/microcode_intel_early.c b/arch/x86/kernel/microcode_intel_early.c
new file mode 100644
index 000000000000..7890bc838952
--- /dev/null
+++ b/arch/x86/kernel/microcode_intel_early.c
@@ -0,0 +1,796 @@
1/*
2 * Intel CPU microcode early update for Linux
3 *
4 * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
5 * H Peter Anvin" <hpa@zytor.com>
6 *
7 * This allows to early upgrade microcode on Intel processors
8 * belonging to IA-32 family - PentiumPro, Pentium II,
9 * Pentium III, Xeon, Pentium 4, etc.
10 *
11 * Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
12 * Software Developer's Manual.
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 */
19#include <linux/module.h>
20#include <linux/mm.h>
21#include <linux/slab.h>
22#include <linux/earlycpio.h>
23#include <linux/initrd.h>
24#include <linux/cpu.h>
25#include <asm/msr.h>
26#include <asm/microcode_intel.h>
27#include <asm/processor.h>
28#include <asm/tlbflush.h>
29#include <asm/setup.h>
30
31unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
32struct mc_saved_data {
33 unsigned int mc_saved_count;
34 struct microcode_intel **mc_saved;
35} mc_saved_data;
36
37static enum ucode_state __cpuinit
38generic_load_microcode_early(struct microcode_intel **mc_saved_p,
39 unsigned int mc_saved_count,
40 struct ucode_cpu_info *uci)
41{
42 struct microcode_intel *ucode_ptr, *new_mc = NULL;
43 int new_rev = uci->cpu_sig.rev;
44 enum ucode_state state = UCODE_OK;
45 unsigned int mc_size;
46 struct microcode_header_intel *mc_header;
47 unsigned int csig = uci->cpu_sig.sig;
48 unsigned int cpf = uci->cpu_sig.pf;
49 int i;
50
51 for (i = 0; i < mc_saved_count; i++) {
52 ucode_ptr = mc_saved_p[i];
53
54 mc_header = (struct microcode_header_intel *)ucode_ptr;
55 mc_size = get_totalsize(mc_header);
56 if (get_matching_microcode(csig, cpf, ucode_ptr, new_rev)) {
57 new_rev = mc_header->rev;
58 new_mc = ucode_ptr;
59 }
60 }
61
62 if (!new_mc) {
63 state = UCODE_NFOUND;
64 goto out;
65 }
66
67 uci->mc = (struct microcode_intel *)new_mc;
68out:
69 return state;
70}
71
72static void __cpuinit
73microcode_pointer(struct microcode_intel **mc_saved,
74 unsigned long *mc_saved_in_initrd,
75 unsigned long initrd_start, int mc_saved_count)
76{
77 int i;
78
79 for (i = 0; i < mc_saved_count; i++)
80 mc_saved[i] = (struct microcode_intel *)
81 (mc_saved_in_initrd[i] + initrd_start);
82}
83
84#ifdef CONFIG_X86_32
85static void __cpuinit
86microcode_phys(struct microcode_intel **mc_saved_tmp,
87 struct mc_saved_data *mc_saved_data)
88{
89 int i;
90 struct microcode_intel ***mc_saved;
91
92 mc_saved = (struct microcode_intel ***)
93 __pa_symbol(&mc_saved_data->mc_saved);
94 for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
95 struct microcode_intel *p;
96
97 p = *(struct microcode_intel **)
98 __pa(mc_saved_data->mc_saved + i);
99 mc_saved_tmp[i] = (struct microcode_intel *)__pa(p);
100 }
101}
102#endif
103
104static enum ucode_state __cpuinit
105load_microcode(struct mc_saved_data *mc_saved_data,
106 unsigned long *mc_saved_in_initrd,
107 unsigned long initrd_start,
108 struct ucode_cpu_info *uci)
109{
110 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
111 unsigned int count = mc_saved_data->mc_saved_count;
112
113 if (!mc_saved_data->mc_saved) {
114 microcode_pointer(mc_saved_tmp, mc_saved_in_initrd,
115 initrd_start, count);
116
117 return generic_load_microcode_early(mc_saved_tmp, count, uci);
118 } else {
119#ifdef CONFIG_X86_32
120 microcode_phys(mc_saved_tmp, mc_saved_data);
121 return generic_load_microcode_early(mc_saved_tmp, count, uci);
122#else
123 return generic_load_microcode_early(mc_saved_data->mc_saved,
124 count, uci);
125#endif
126 }
127}
128
129static u8 get_x86_family(unsigned long sig)
130{
131 u8 x86;
132
133 x86 = (sig >> 8) & 0xf;
134
135 if (x86 == 0xf)
136 x86 += (sig >> 20) & 0xff;
137
138 return x86;
139}
140
141static u8 get_x86_model(unsigned long sig)
142{
143 u8 x86, x86_model;
144
145 x86 = get_x86_family(sig);
146 x86_model = (sig >> 4) & 0xf;
147
148 if (x86 == 0x6 || x86 == 0xf)
149 x86_model += ((sig >> 16) & 0xf) << 4;
150
151 return x86_model;
152}
153
154/*
155 * Given CPU signature and a microcode patch, this function finds if the
156 * microcode patch has matching family and model with the CPU.
157 */
158static enum ucode_state
159matching_model_microcode(struct microcode_header_intel *mc_header,
160 unsigned long sig)
161{
162 u8 x86, x86_model;
163 u8 x86_ucode, x86_model_ucode;
164 struct extended_sigtable *ext_header;
165 unsigned long total_size = get_totalsize(mc_header);
166 unsigned long data_size = get_datasize(mc_header);
167 int ext_sigcount, i;
168 struct extended_signature *ext_sig;
169
170 x86 = get_x86_family(sig);
171 x86_model = get_x86_model(sig);
172
173 x86_ucode = get_x86_family(mc_header->sig);
174 x86_model_ucode = get_x86_model(mc_header->sig);
175
176 if (x86 == x86_ucode && x86_model == x86_model_ucode)
177 return UCODE_OK;
178
179 /* Look for ext. headers: */
180 if (total_size <= data_size + MC_HEADER_SIZE)
181 return UCODE_NFOUND;
182
183 ext_header = (struct extended_sigtable *)
184 mc_header + data_size + MC_HEADER_SIZE;
185 ext_sigcount = ext_header->count;
186 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
187
188 for (i = 0; i < ext_sigcount; i++) {
189 x86_ucode = get_x86_family(ext_sig->sig);
190 x86_model_ucode = get_x86_model(ext_sig->sig);
191
192 if (x86 == x86_ucode && x86_model == x86_model_ucode)
193 return UCODE_OK;
194
195 ext_sig++;
196 }
197
198 return UCODE_NFOUND;
199}
200
201static int
202save_microcode(struct mc_saved_data *mc_saved_data,
203 struct microcode_intel **mc_saved_src,
204 unsigned int mc_saved_count)
205{
206 int i, j;
207 struct microcode_intel **mc_saved_p;
208 int ret;
209
210 if (!mc_saved_count)
211 return -EINVAL;
212
213 /*
214 * Copy new microcode data.
215 */
216 mc_saved_p = kmalloc(mc_saved_count*sizeof(struct microcode_intel *),
217 GFP_KERNEL);
218 if (!mc_saved_p)
219 return -ENOMEM;
220
221 for (i = 0; i < mc_saved_count; i++) {
222 struct microcode_intel *mc = mc_saved_src[i];
223 struct microcode_header_intel *mc_header = &mc->hdr;
224 unsigned long mc_size = get_totalsize(mc_header);
225 mc_saved_p[i] = kmalloc(mc_size, GFP_KERNEL);
226 if (!mc_saved_p[i]) {
227 ret = -ENOMEM;
228 goto err;
229 }
230 if (!mc_saved_src[i]) {
231 ret = -EINVAL;
232 goto err;
233 }
234 memcpy(mc_saved_p[i], mc, mc_size);
235 }
236
237 /*
238 * Point to newly saved microcode.
239 */
240 mc_saved_data->mc_saved = mc_saved_p;
241 mc_saved_data->mc_saved_count = mc_saved_count;
242
243 return 0;
244
245err:
246 for (j = 0; j <= i; j++)
247 kfree(mc_saved_p[j]);
248 kfree(mc_saved_p);
249
250 return ret;
251}
252
253/*
254 * A microcode patch in ucode_ptr is saved into mc_saved
255 * - if it has matching signature and newer revision compared to an existing
256 * patch mc_saved.
257 * - or if it is a newly discovered microcode patch.
258 *
259 * The microcode patch should have matching model with CPU.
260 */
261static void _save_mc(struct microcode_intel **mc_saved, u8 *ucode_ptr,
262 unsigned int *mc_saved_count_p)
263{
264 int i;
265 int found = 0;
266 unsigned int mc_saved_count = *mc_saved_count_p;
267 struct microcode_header_intel *mc_header;
268
269 mc_header = (struct microcode_header_intel *)ucode_ptr;
270 for (i = 0; i < mc_saved_count; i++) {
271 unsigned int sig, pf;
272 unsigned int new_rev;
273 struct microcode_header_intel *mc_saved_header =
274 (struct microcode_header_intel *)mc_saved[i];
275 sig = mc_saved_header->sig;
276 pf = mc_saved_header->pf;
277 new_rev = mc_header->rev;
278
279 if (get_matching_sig(sig, pf, ucode_ptr, new_rev)) {
280 found = 1;
281 if (update_match_revision(mc_header, new_rev)) {
282 /*
283 * Found an older ucode saved before.
284 * Replace the older one with this newer
285 * one.
286 */
287 mc_saved[i] =
288 (struct microcode_intel *)ucode_ptr;
289 break;
290 }
291 }
292 }
293 if (i >= mc_saved_count && !found)
294 /*
295 * This ucode is first time discovered in ucode file.
296 * Save it to memory.
297 */
298 mc_saved[mc_saved_count++] =
299 (struct microcode_intel *)ucode_ptr;
300
301 *mc_saved_count_p = mc_saved_count;
302}
303
304/*
305 * Get microcode matching with BSP's model. Only CPUs with the same model as
306 * BSP can stay in the platform.
307 */
308static enum ucode_state __init
309get_matching_model_microcode(int cpu, unsigned long start,
310 void *data, size_t size,
311 struct mc_saved_data *mc_saved_data,
312 unsigned long *mc_saved_in_initrd,
313 struct ucode_cpu_info *uci)
314{
315 u8 *ucode_ptr = data;
316 unsigned int leftover = size;
317 enum ucode_state state = UCODE_OK;
318 unsigned int mc_size;
319 struct microcode_header_intel *mc_header;
320 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
321 unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
322 int i;
323
324 while (leftover) {
325 mc_header = (struct microcode_header_intel *)ucode_ptr;
326
327 mc_size = get_totalsize(mc_header);
328 if (!mc_size || mc_size > leftover ||
329 microcode_sanity_check(ucode_ptr, 0) < 0)
330 break;
331
332 leftover -= mc_size;
333
334 /*
335 * Since APs with same family and model as the BSP may boot in
336 * the platform, we need to find and save microcode patches
337 * with the same family and model as the BSP.
338 */
339 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
340 UCODE_OK) {
341 ucode_ptr += mc_size;
342 continue;
343 }
344
345 _save_mc(mc_saved_tmp, ucode_ptr, &mc_saved_count);
346
347 ucode_ptr += mc_size;
348 }
349
350 if (leftover) {
351 state = UCODE_ERROR;
352 goto out;
353 }
354
355 if (mc_saved_count == 0) {
356 state = UCODE_NFOUND;
357 goto out;
358 }
359
360 for (i = 0; i < mc_saved_count; i++)
361 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
362
363 mc_saved_data->mc_saved_count = mc_saved_count;
364out:
365 return state;
366}
367
368#define native_rdmsr(msr, val1, val2) \
369do { \
370 u64 __val = native_read_msr((msr)); \
371 (void)((val1) = (u32)__val); \
372 (void)((val2) = (u32)(__val >> 32)); \
373} while (0)
374
375#define native_wrmsr(msr, low, high) \
376 native_write_msr(msr, low, high);
377
378static int __cpuinit collect_cpu_info_early(struct ucode_cpu_info *uci)
379{
380 unsigned int val[2];
381 u8 x86, x86_model;
382 struct cpu_signature csig;
383 unsigned int eax, ebx, ecx, edx;
384
385 csig.sig = 0;
386 csig.pf = 0;
387 csig.rev = 0;
388
389 memset(uci, 0, sizeof(*uci));
390
391 eax = 0x00000001;
392 ecx = 0;
393 native_cpuid(&eax, &ebx, &ecx, &edx);
394 csig.sig = eax;
395
396 x86 = get_x86_family(csig.sig);
397 x86_model = get_x86_model(csig.sig);
398
399 if ((x86_model >= 5) || (x86 > 6)) {
400 /* get processor flags from MSR 0x17 */
401 native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
402 csig.pf = 1 << ((val[1] >> 18) & 7);
403 }
404 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
405
406 /* As documented in the SDM: Do a CPUID 1 here */
407 sync_core();
408
409 /* get the current revision from MSR 0x8B */
410 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
411
412 csig.rev = val[1];
413
414 uci->cpu_sig = csig;
415 uci->valid = 1;
416
417 return 0;
418}
419
420#ifdef DEBUG
421static void __ref show_saved_mc(void)
422{
423 int i, j;
424 unsigned int sig, pf, rev, total_size, data_size, date;
425 struct ucode_cpu_info uci;
426
427 if (mc_saved_data.mc_saved_count == 0) {
428 pr_debug("no micorcode data saved.\n");
429 return;
430 }
431 pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
432
433 collect_cpu_info_early(&uci);
434
435 sig = uci.cpu_sig.sig;
436 pf = uci.cpu_sig.pf;
437 rev = uci.cpu_sig.rev;
438 pr_debug("CPU%d: sig=0x%x, pf=0x%x, rev=0x%x\n",
439 smp_processor_id(), sig, pf, rev);
440
441 for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
442 struct microcode_header_intel *mc_saved_header;
443 struct extended_sigtable *ext_header;
444 int ext_sigcount;
445 struct extended_signature *ext_sig;
446
447 mc_saved_header = (struct microcode_header_intel *)
448 mc_saved_data.mc_saved[i];
449 sig = mc_saved_header->sig;
450 pf = mc_saved_header->pf;
451 rev = mc_saved_header->rev;
452 total_size = get_totalsize(mc_saved_header);
453 data_size = get_datasize(mc_saved_header);
454 date = mc_saved_header->date;
455
456 pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
457 i, sig, pf, rev, total_size,
458 date & 0xffff,
459 date >> 24,
460 (date >> 16) & 0xff);
461
462 /* Look for ext. headers: */
463 if (total_size <= data_size + MC_HEADER_SIZE)
464 continue;
465
466 ext_header = (struct extended_sigtable *)
467 mc_saved_header + data_size + MC_HEADER_SIZE;
468 ext_sigcount = ext_header->count;
469 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
470
471 for (j = 0; j < ext_sigcount; j++) {
472 sig = ext_sig->sig;
473 pf = ext_sig->pf;
474
475 pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
476 j, sig, pf);
477
478 ext_sig++;
479 }
480
481 }
482}
483#else
484static inline void show_saved_mc(void)
485{
486}
487#endif
488
489#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
490/*
491 * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
492 * hot added or resumes.
493 *
494 * Please make sure this mc should be a valid microcode patch before calling
495 * this function.
496 */
497int save_mc_for_early(u8 *mc)
498{
499 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
500 unsigned int mc_saved_count_init;
501 unsigned int mc_saved_count;
502 struct microcode_intel **mc_saved;
503 int ret = 0;
504 int i;
505
506 /*
507 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
508 * hotplug.
509 */
510 cpu_hotplug_driver_lock();
511
512 mc_saved_count_init = mc_saved_data.mc_saved_count;
513 mc_saved_count = mc_saved_data.mc_saved_count;
514 mc_saved = mc_saved_data.mc_saved;
515
516 if (mc_saved && mc_saved_count)
517 memcpy(mc_saved_tmp, mc_saved,
518 mc_saved_count * sizeof(struct mirocode_intel *));
519 /*
520 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
521 * version.
522 */
523
524 _save_mc(mc_saved_tmp, mc, &mc_saved_count);
525
526 /*
527 * Save the mc_save_tmp in global mc_saved_data.
528 */
529 ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
530 if (ret) {
531 pr_err("Can not save microcode patch.\n");
532 goto out;
533 }
534
535 show_saved_mc();
536
537 /*
538 * Free old saved microcod data.
539 */
540 if (mc_saved) {
541 for (i = 0; i < mc_saved_count_init; i++)
542 kfree(mc_saved[i]);
543 kfree(mc_saved);
544 }
545
546out:
547 cpu_hotplug_driver_unlock();
548
549 return ret;
550}
551EXPORT_SYMBOL_GPL(save_mc_for_early);
552#endif
553
554static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
555static __init enum ucode_state
556scan_microcode(unsigned long start, unsigned long end,
557 struct mc_saved_data *mc_saved_data,
558 unsigned long *mc_saved_in_initrd,
559 struct ucode_cpu_info *uci)
560{
561 unsigned int size = end - start + 1;
562 struct cpio_data cd;
563 long offset = 0;
564#ifdef CONFIG_X86_32
565 char *p = (char *)__pa_symbol(ucode_name);
566#else
567 char *p = ucode_name;
568#endif
569
570 cd.data = NULL;
571 cd.size = 0;
572
573 cd = find_cpio_data(p, (void *)start, size, &offset);
574 if (!cd.data)
575 return UCODE_ERROR;
576
577
578 return get_matching_model_microcode(0, start, cd.data, cd.size,
579 mc_saved_data, mc_saved_in_initrd,
580 uci);
581}
582
583/*
584 * Print ucode update info.
585 */
586static void __cpuinit
587print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
588{
589 int cpu = smp_processor_id();
590
591 pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
592 cpu,
593 uci->cpu_sig.rev,
594 date & 0xffff,
595 date >> 24,
596 (date >> 16) & 0xff);
597}
598
599#ifdef CONFIG_X86_32
600
601static int delay_ucode_info;
602static int current_mc_date;
603
604/*
605 * Print early updated ucode info after printk works. This is delayed info dump.
606 */
607void __cpuinit show_ucode_info_early(void)
608{
609 struct ucode_cpu_info uci;
610
611 if (delay_ucode_info) {
612 collect_cpu_info_early(&uci);
613 print_ucode_info(&uci, current_mc_date);
614 delay_ucode_info = 0;
615 }
616}
617
618/*
619 * At this point, we can not call printk() yet. Keep microcode patch number in
620 * mc_saved_data.mc_saved and delay printing microcode info in
621 * show_ucode_info_early() until printk() works.
622 */
623static void __cpuinit print_ucode(struct ucode_cpu_info *uci)
624{
625 struct microcode_intel *mc_intel;
626 int *delay_ucode_info_p;
627 int *current_mc_date_p;
628
629 mc_intel = uci->mc;
630 if (mc_intel == NULL)
631 return;
632
633 delay_ucode_info_p = (int *)__pa_symbol(&delay_ucode_info);
634 current_mc_date_p = (int *)__pa_symbol(&current_mc_date);
635
636 *delay_ucode_info_p = 1;
637 *current_mc_date_p = mc_intel->hdr.date;
638}
639#else
640
641/*
642 * Flush global tlb. We only do this in x86_64 where paging has been enabled
643 * already and PGE should be enabled as well.
644 */
645static inline void __cpuinit flush_tlb_early(void)
646{
647 __native_flush_tlb_global_irq_disabled();
648}
649
650static inline void __cpuinit print_ucode(struct ucode_cpu_info *uci)
651{
652 struct microcode_intel *mc_intel;
653
654 mc_intel = uci->mc;
655 if (mc_intel == NULL)
656 return;
657
658 print_ucode_info(uci, mc_intel->hdr.date);
659}
660#endif
661
662static int apply_microcode_early(struct mc_saved_data *mc_saved_data,
663 struct ucode_cpu_info *uci)
664{
665 struct microcode_intel *mc_intel;
666 unsigned int val[2];
667
668 mc_intel = uci->mc;
669 if (mc_intel == NULL)
670 return 0;
671
672 /* write microcode via MSR 0x79 */
673 native_wrmsr(MSR_IA32_UCODE_WRITE,
674 (unsigned long) mc_intel->bits,
675 (unsigned long) mc_intel->bits >> 16 >> 16);
676 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
677
678 /* As documented in the SDM: Do a CPUID 1 here */
679 sync_core();
680
681 /* get the current revision from MSR 0x8B */
682 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
683 if (val[1] != mc_intel->hdr.rev)
684 return -1;
685
686#ifdef CONFIG_X86_64
687 /* Flush global tlb. This is precaution. */
688 flush_tlb_early();
689#endif
690 uci->cpu_sig.rev = val[1];
691
692 print_ucode(uci);
693
694 return 0;
695}
696
697/*
698 * This function converts microcode patch offsets previously stored in
699 * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
700 */
701int __init save_microcode_in_initrd(void)
702{
703 unsigned int count = mc_saved_data.mc_saved_count;
704 struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
705 int ret = 0;
706
707 if (count == 0)
708 return ret;
709
710 microcode_pointer(mc_saved, mc_saved_in_initrd, initrd_start, count);
711 ret = save_microcode(&mc_saved_data, mc_saved, count);
712 if (ret)
713 pr_err("Can not save microcod patches from initrd");
714
715 show_saved_mc();
716
717 return ret;
718}
719
720static void __init
721_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
722 unsigned long *mc_saved_in_initrd,
723 unsigned long initrd_start_early,
724 unsigned long initrd_end_early,
725 struct ucode_cpu_info *uci)
726{
727 collect_cpu_info_early(uci);
728 scan_microcode(initrd_start_early, initrd_end_early, mc_saved_data,
729 mc_saved_in_initrd, uci);
730 load_microcode(mc_saved_data, mc_saved_in_initrd,
731 initrd_start_early, uci);
732 apply_microcode_early(mc_saved_data, uci);
733}
734
735void __init
736load_ucode_intel_bsp(void)
737{
738 u64 ramdisk_image, ramdisk_size;
739 unsigned long initrd_start_early, initrd_end_early;
740 struct ucode_cpu_info uci;
741#ifdef CONFIG_X86_32
742 struct boot_params *boot_params_p;
743
744 boot_params_p = (struct boot_params *)__pa_symbol(&boot_params);
745 ramdisk_image = boot_params_p->hdr.ramdisk_image;
746 ramdisk_size = boot_params_p->hdr.ramdisk_size;
747 initrd_start_early = ramdisk_image;
748 initrd_end_early = initrd_start_early + ramdisk_size;
749
750 _load_ucode_intel_bsp(
751 (struct mc_saved_data *)__pa_symbol(&mc_saved_data),
752 (unsigned long *)__pa_symbol(&mc_saved_in_initrd),
753 initrd_start_early, initrd_end_early, &uci);
754#else
755 ramdisk_image = boot_params.hdr.ramdisk_image;
756 ramdisk_size = boot_params.hdr.ramdisk_size;
757 initrd_start_early = ramdisk_image + PAGE_OFFSET;
758 initrd_end_early = initrd_start_early + ramdisk_size;
759
760 _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
761 initrd_start_early, initrd_end_early, &uci);
762#endif
763}
764
765void __cpuinit load_ucode_intel_ap(void)
766{
767 struct mc_saved_data *mc_saved_data_p;
768 struct ucode_cpu_info uci;
769 unsigned long *mc_saved_in_initrd_p;
770 unsigned long initrd_start_addr;
771#ifdef CONFIG_X86_32
772 unsigned long *initrd_start_p;
773
774 mc_saved_in_initrd_p =
775 (unsigned long *)__pa_symbol(mc_saved_in_initrd);
776 mc_saved_data_p = (struct mc_saved_data *)__pa_symbol(&mc_saved_data);
777 initrd_start_p = (unsigned long *)__pa_symbol(&initrd_start);
778 initrd_start_addr = (unsigned long)__pa_symbol(*initrd_start_p);
779#else
780 mc_saved_data_p = &mc_saved_data;
781 mc_saved_in_initrd_p = mc_saved_in_initrd;
782 initrd_start_addr = initrd_start;
783#endif
784
785 /*
786 * If there is no valid ucode previously saved in memory, no need to
787 * update ucode on this AP.
788 */
789 if (mc_saved_data_p->mc_saved_count == 0)
790 return;
791
792 collect_cpu_info_early(&uci);
793 load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
794 initrd_start_addr, &uci);
795 apply_microcode_early(mc_saved_data_p, &uci);
796}
diff --git a/arch/x86/kernel/microcode_intel_lib.c b/arch/x86/kernel/microcode_intel_lib.c
new file mode 100644
index 000000000000..ce69320d0179
--- /dev/null
+++ b/arch/x86/kernel/microcode_intel_lib.c
@@ -0,0 +1,174 @@
1/*
2 * Intel CPU Microcode Update Driver for Linux
3 *
4 * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
5 * H Peter Anvin" <hpa@zytor.com>
6 *
7 * This driver allows to upgrade microcode on Intel processors
8 * belonging to IA-32 family - PentiumPro, Pentium II,
9 * Pentium III, Xeon, Pentium 4, etc.
10 *
11 * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture
12 * Software Developer's Manual
13 * Order Number 253668 or free download from:
14 *
15 * http://developer.intel.com/Assets/PDF/manual/253668.pdf
16 *
17 * For more information, go to http://www.urbanmyth.org/microcode
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
23 *
24 */
25#include <linux/firmware.h>
26#include <linux/uaccess.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29
30#include <asm/microcode_intel.h>
31#include <asm/processor.h>
32#include <asm/msr.h>
33
34static inline int
35update_match_cpu(unsigned int csig, unsigned int cpf,
36 unsigned int sig, unsigned int pf)
37{
38 return (!sigmatch(sig, csig, pf, cpf)) ? 0 : 1;
39}
40
41int
42update_match_revision(struct microcode_header_intel *mc_header, int rev)
43{
44 return (mc_header->rev <= rev) ? 0 : 1;
45}
46
47int microcode_sanity_check(void *mc, int print_err)
48{
49 unsigned long total_size, data_size, ext_table_size;
50 struct microcode_header_intel *mc_header = mc;
51 struct extended_sigtable *ext_header = NULL;
52 int sum, orig_sum, ext_sigcount = 0, i;
53 struct extended_signature *ext_sig;
54
55 total_size = get_totalsize(mc_header);
56 data_size = get_datasize(mc_header);
57
58 if (data_size + MC_HEADER_SIZE > total_size) {
59 if (print_err)
60 pr_err("error! Bad data size in microcode data file\n");
61 return -EINVAL;
62 }
63
64 if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
65 if (print_err)
66 pr_err("error! Unknown microcode update format\n");
67 return -EINVAL;
68 }
69 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
70 if (ext_table_size) {
71 if ((ext_table_size < EXT_HEADER_SIZE)
72 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
73 if (print_err)
74 pr_err("error! Small exttable size in microcode data file\n");
75 return -EINVAL;
76 }
77 ext_header = mc + MC_HEADER_SIZE + data_size;
78 if (ext_table_size != exttable_size(ext_header)) {
79 if (print_err)
80 pr_err("error! Bad exttable size in microcode data file\n");
81 return -EFAULT;
82 }
83 ext_sigcount = ext_header->count;
84 }
85
86 /* check extended table checksum */
87 if (ext_table_size) {
88 int ext_table_sum = 0;
89 int *ext_tablep = (int *)ext_header;
90
91 i = ext_table_size / DWSIZE;
92 while (i--)
93 ext_table_sum += ext_tablep[i];
94 if (ext_table_sum) {
95 if (print_err)
96 pr_warn("aborting, bad extended signature table checksum\n");
97 return -EINVAL;
98 }
99 }
100
101 /* calculate the checksum */
102 orig_sum = 0;
103 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
104 while (i--)
105 orig_sum += ((int *)mc)[i];
106 if (orig_sum) {
107 if (print_err)
108 pr_err("aborting, bad checksum\n");
109 return -EINVAL;
110 }
111 if (!ext_table_size)
112 return 0;
113 /* check extended signature checksum */
114 for (i = 0; i < ext_sigcount; i++) {
115 ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
116 EXT_SIGNATURE_SIZE * i;
117 sum = orig_sum
118 - (mc_header->sig + mc_header->pf + mc_header->cksum)
119 + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
120 if (sum) {
121 if (print_err)
122 pr_err("aborting, bad checksum\n");
123 return -EINVAL;
124 }
125 }
126 return 0;
127}
128EXPORT_SYMBOL_GPL(microcode_sanity_check);
129
130/*
131 * return 0 - no update found
132 * return 1 - found update
133 */
134int get_matching_sig(unsigned int csig, int cpf, void *mc, int rev)
135{
136 struct microcode_header_intel *mc_header = mc;
137 struct extended_sigtable *ext_header;
138 unsigned long total_size = get_totalsize(mc_header);
139 int ext_sigcount, i;
140 struct extended_signature *ext_sig;
141
142 if (update_match_cpu(csig, cpf, mc_header->sig, mc_header->pf))
143 return 1;
144
145 /* Look for ext. headers: */
146 if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
147 return 0;
148
149 ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
150 ext_sigcount = ext_header->count;
151 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
152
153 for (i = 0; i < ext_sigcount; i++) {
154 if (update_match_cpu(csig, cpf, ext_sig->sig, ext_sig->pf))
155 return 1;
156 ext_sig++;
157 }
158 return 0;
159}
160
161/*
162 * return 0 - no update found
163 * return 1 - found update
164 */
165int get_matching_microcode(unsigned int csig, int cpf, void *mc, int rev)
166{
167 struct microcode_header_intel *mc_header = mc;
168
169 if (!update_match_revision(mc_header, rev))
170 return 0;
171
172 return get_matching_sig(csig, cpf, mc, rev);
173}
174EXPORT_SYMBOL_GPL(get_matching_microcode);
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index d41815265a0b..4903a03ae876 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -16,6 +16,7 @@
16#include <asm/tlb.h> 16#include <asm/tlb.h>
17#include <asm/proto.h> 17#include <asm/proto.h>
18#include <asm/dma.h> /* for MAX_DMA_PFN */ 18#include <asm/dma.h> /* for MAX_DMA_PFN */
19#include <asm/microcode.h>
19 20
20#include "mm_internal.h" 21#include "mm_internal.h"
21 22
@@ -534,6 +535,15 @@ void free_initmem(void)
534#ifdef CONFIG_BLK_DEV_INITRD 535#ifdef CONFIG_BLK_DEV_INITRD
535void __init free_initrd_mem(unsigned long start, unsigned long end) 536void __init free_initrd_mem(unsigned long start, unsigned long end)
536{ 537{
538#ifdef CONFIG_MICROCODE_EARLY
539 /*
540 * Remember, initrd memory may contain microcode or other useful things.
541 * Before we lose initrd mem, we need to find a place to hold them
542 * now that normal virtual memory is enabled.
543 */
544 save_microcode_in_initrd();
545#endif
546
537 /* 547 /*
538 * end could be not aligned, and We can not align that, 548 * end could be not aligned, and We can not align that,
539 * decompresser could be confused by aligned initrd_end 549 * decompresser could be confused by aligned initrd_end
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 05:39:14 -0500