2 * Copyright (C) 2013 Advanced Micro Devices, Inc.
4 * Author: Jacob Shin <jacob.shin@amd.com>
5 * Fixes: Borislav Petkov <bp@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/earlycpio.h>
13 #include <linux/initrd.h>
16 #include <asm/setup.h>
17 #include <asm/microcode_amd.h>
20 * This points to the current valid container of microcode patches which we will
21 * save from the initrd before jettisoning its contents.
24 static size_t container_size;
26 static u32 ucode_new_rev;
27 u8 amd_ucode_patch[PATCH_MAX_SIZE];
28 static u16 this_equiv_id;
30 struct cpio_data ucode_cpio;
33 * Microcode patch container file is prepended to the initrd in cpio format.
34 * See Documentation/x86/early-microcode.txt
36 static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
38 static struct cpio_data __init find_ucode_in_initrd(void)
46 struct boot_params *p;
49 * On 32-bit, early load occurs before paging is turned on so we need
50 * to use physical addresses.
52 p = (struct boot_params *)__pa_nodebug(&boot_params);
53 path = (char *)__pa_nodebug(ucode_path);
54 start = (void *)p->hdr.ramdisk_image;
55 size = p->hdr.ramdisk_size;
58 start = (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET);
59 size = boot_params.hdr.ramdisk_size;
62 return find_cpio_data(path, start, size, &offset);
65 static size_t compute_container_size(u8 *data, u32 total_size)
68 u32 *header = (u32 *)data;
70 if (header[0] != UCODE_MAGIC ||
71 header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
72 header[2] == 0) /* size */
75 size = header[2] + CONTAINER_HDR_SZ;
84 if (header[0] != UCODE_UCODE_TYPE)
88 * Sanity-check patch size.
90 patch_size = header[1];
91 if (patch_size > PATCH_MAX_SIZE)
94 size += patch_size + SECTION_HDR_SIZE;
95 data += patch_size + SECTION_HDR_SIZE;
96 total_size -= patch_size + SECTION_HDR_SIZE;
103 * Early load occurs before we can vmalloc(). So we look for the microcode
104 * patch container file in initrd, traverse equivalent cpu table, look for a
105 * matching microcode patch, and update, all in initrd memory in place.
106 * When vmalloc() is available for use later -- on 64-bit during first AP load,
107 * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
108 * load_microcode_amd() to save equivalent cpu table and microcode patches in
109 * kernel heap memory.
111 static void apply_ucode_in_initrd(void *ucode, size_t size)
113 struct equiv_cpu_entry *eq;
119 u32 rev, eax, ebx, ecx, edx;
123 new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
124 cont_sz = (size_t *)__pa_nodebug(&container_size);
125 cont = (u8 **)__pa_nodebug(&container);
127 new_rev = &ucode_new_rev;
128 cont_sz = &container_size;
134 header = (u32 *)data;
136 /* find equiv cpu table */
137 if (header[0] != UCODE_MAGIC ||
138 header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
139 header[2] == 0) /* size */
144 native_cpuid(&eax, &ebx, &ecx, &edx);
147 eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
151 /* Advance past the container header */
152 offset = header[2] + CONTAINER_HDR_SZ;
156 eq_id = find_equiv_id(eq, eax);
158 this_equiv_id = eq_id;
159 *cont_sz = compute_container_size(*cont, left + offset);
162 * truncate how much we need to iterate over in the
163 * ucode update loop below
165 left = *cont_sz - offset;
170 * support multiple container files appended together. if this
171 * one does not have a matching equivalent cpu entry, we fast
172 * forward to the next container file.
175 header = (u32 *)data;
176 if (header[0] == UCODE_MAGIC &&
177 header[1] == UCODE_EQUIV_CPU_TABLE_TYPE)
180 offset = header[1] + SECTION_HDR_SIZE;
185 /* mark where the next microcode container file starts */
186 offset = data - (u8 *)ucode;
196 /* find ucode and update if needed */
198 native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
201 struct microcode_amd *mc;
203 header = (u32 *)data;
204 if (header[0] != UCODE_UCODE_TYPE || /* type */
205 header[1] == 0) /* size */
208 mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
210 if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id) {
212 if (!__apply_microcode_amd(mc)) {
213 rev = mc->hdr.patch_id;
216 /* save ucode patch */
217 memcpy(amd_ucode_patch, mc,
218 min_t(u32, header[1], PATCH_MAX_SIZE));
222 offset = header[1] + SECTION_HDR_SIZE;
228 void __init load_ucode_amd_bsp(void)
235 data = (void **)__pa_nodebug(&ucode_cpio.data);
236 size = (size_t *)__pa_nodebug(&ucode_cpio.size);
238 data = &ucode_cpio.data;
239 size = &ucode_cpio.size;
242 cp = find_ucode_in_initrd();
249 apply_ucode_in_initrd(cp.data, cp.size);
254 * On 32-bit, since AP's early load occurs before paging is turned on, we
255 * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
256 * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
257 * save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
258 * which is used upon resume from suspend.
260 void load_ucode_amd_ap(void)
262 struct microcode_amd *mc;
266 mc = (struct microcode_amd *)__pa(amd_ucode_patch);
267 if (mc->hdr.patch_id && mc->hdr.processor_rev_id) {
268 __apply_microcode_amd(mc);
272 ucode = (void *)__pa_nodebug(&container);
273 usize = (size_t *)__pa_nodebug(&container_size);
275 if (!*ucode || !*usize)
278 apply_ucode_in_initrd(*ucode, *usize);
281 static void __init collect_cpu_sig_on_bsp(void *arg)
283 unsigned int cpu = smp_processor_id();
284 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
286 uci->cpu_sig.sig = cpuid_eax(0x00000001);
289 void load_ucode_amd_ap(void)
291 unsigned int cpu = smp_processor_id();
292 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
293 struct equiv_cpu_entry *eq;
294 struct microcode_amd *mc;
298 /* Exit if called on the BSP. */
305 rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
307 uci->cpu_sig.rev = rev;
308 uci->cpu_sig.sig = eax;
310 eax = cpuid_eax(0x00000001);
311 eq = (struct equiv_cpu_entry *)(container + CONTAINER_HDR_SZ);
313 eq_id = find_equiv_id(eq, eax);
317 if (eq_id == this_equiv_id) {
318 mc = (struct microcode_amd *)amd_ucode_patch;
320 if (mc && rev < mc->hdr.patch_id) {
321 if (!__apply_microcode_amd(mc))
322 ucode_new_rev = mc->hdr.patch_id;
326 if (!ucode_cpio.data)
330 * AP has a different equivalence ID than BSP, looks like
331 * mixed-steppings silicon so go through the ucode blob anew.
333 apply_ucode_in_initrd(ucode_cpio.data, ucode_cpio.size);
338 int __init save_microcode_in_initrd_amd(void)
340 enum ucode_state ret;
344 unsigned int bsp = boot_cpu_data.cpu_index;
345 struct ucode_cpu_info *uci = ucode_cpu_info + bsp;
347 if (!uci->cpu_sig.sig)
348 smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1);
351 * Take into account the fact that the ramdisk might get relocated
352 * and therefore we need to recompute the container's position in
353 * virtual memory space.
355 container = (u8 *)(__va((u32)relocated_ramdisk) +
356 ((u32)container - boot_params.hdr.ramdisk_image));
359 pr_info("microcode: updated early to new patch_level=0x%08x\n",
365 eax = cpuid_eax(0x00000001);
366 eax = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
368 ret = load_microcode_amd(eax, container, container_size);
373 * This will be freed any msec now, stash patches for the current
374 * family and switch to patch cache for cpu hotplug, etc later.