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https://github.com/brain-hackers/u-boot-brain
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![Bin Meng](/assets/img/avatar_default.png)
CPUID (EAX 01H) returns MTRR support flag in EDX bit 12. Probe this flag in x86_cpu_init_f() and save it in global data. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
596 lines
13 KiB
C
596 lines
13 KiB
C
/*
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* (C) Copyright 2008-2011
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* Part of this file is adapted from coreboot
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* src/arch/x86/lib/cpu.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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#include <malloc.h>
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#include <asm/control_regs.h>
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#include <asm/cpu.h>
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#include <asm/post.h>
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#include <asm/processor.h>
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#include <asm/processor-flags.h>
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#include <asm/interrupt.h>
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#include <linux/compiler.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Constructor for a conventional segment GDT (or LDT) entry
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* This is a macro so it can be used in initialisers
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*/
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#define GDT_ENTRY(flags, base, limit) \
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((((base) & 0xff000000ULL) << (56-24)) | \
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(((flags) & 0x0000f0ffULL) << 40) | \
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(((limit) & 0x000f0000ULL) << (48-16)) | \
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(((base) & 0x00ffffffULL) << 16) | \
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(((limit) & 0x0000ffffULL)))
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struct gdt_ptr {
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u16 len;
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u32 ptr;
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} __packed;
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struct cpu_device_id {
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unsigned vendor;
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unsigned device;
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};
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struct cpuinfo_x86 {
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uint8_t x86; /* CPU family */
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uint8_t x86_vendor; /* CPU vendor */
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uint8_t x86_model;
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uint8_t x86_mask;
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};
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/*
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* List of cpu vendor strings along with their normalized
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* id values.
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*/
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static struct {
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int vendor;
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const char *name;
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} x86_vendors[] = {
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{ X86_VENDOR_INTEL, "GenuineIntel", },
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{ X86_VENDOR_CYRIX, "CyrixInstead", },
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{ X86_VENDOR_AMD, "AuthenticAMD", },
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{ X86_VENDOR_UMC, "UMC UMC UMC ", },
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{ X86_VENDOR_NEXGEN, "NexGenDriven", },
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{ X86_VENDOR_CENTAUR, "CentaurHauls", },
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{ X86_VENDOR_RISE, "RiseRiseRise", },
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{ X86_VENDOR_TRANSMETA, "GenuineTMx86", },
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{ X86_VENDOR_TRANSMETA, "TransmetaCPU", },
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{ X86_VENDOR_NSC, "Geode by NSC", },
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{ X86_VENDOR_SIS, "SiS SiS SiS ", },
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};
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static const char *const x86_vendor_name[] = {
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[X86_VENDOR_INTEL] = "Intel",
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[X86_VENDOR_CYRIX] = "Cyrix",
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[X86_VENDOR_AMD] = "AMD",
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[X86_VENDOR_UMC] = "UMC",
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[X86_VENDOR_NEXGEN] = "NexGen",
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[X86_VENDOR_CENTAUR] = "Centaur",
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[X86_VENDOR_RISE] = "Rise",
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[X86_VENDOR_TRANSMETA] = "Transmeta",
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[X86_VENDOR_NSC] = "NSC",
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[X86_VENDOR_SIS] = "SiS",
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};
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static void load_ds(u32 segment)
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{
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asm volatile("movl %0, %%ds" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_es(u32 segment)
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{
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asm volatile("movl %0, %%es" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_fs(u32 segment)
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{
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asm volatile("movl %0, %%fs" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_gs(u32 segment)
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{
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asm volatile("movl %0, %%gs" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_ss(u32 segment)
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{
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asm volatile("movl %0, %%ss" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_gdt(const u64 *boot_gdt, u16 num_entries)
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{
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struct gdt_ptr gdt;
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gdt.len = (num_entries * X86_GDT_ENTRY_SIZE) - 1;
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gdt.ptr = (u32)boot_gdt;
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asm volatile("lgdtl %0\n" : : "m" (gdt));
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}
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void setup_gdt(gd_t *id, u64 *gdt_addr)
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{
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/* CS: code, read/execute, 4 GB, base 0 */
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gdt_addr[X86_GDT_ENTRY_32BIT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff);
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/* DS: data, read/write, 4 GB, base 0 */
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gdt_addr[X86_GDT_ENTRY_32BIT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff);
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/* FS: data, read/write, 4 GB, base (Global Data Pointer) */
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id->arch.gd_addr = id;
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gdt_addr[X86_GDT_ENTRY_32BIT_FS] = GDT_ENTRY(0xc093,
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(ulong)&id->arch.gd_addr, 0xfffff);
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/* 16-bit CS: code, read/execute, 64 kB, base 0 */
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gdt_addr[X86_GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x009b, 0, 0x0ffff);
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/* 16-bit DS: data, read/write, 64 kB, base 0 */
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gdt_addr[X86_GDT_ENTRY_16BIT_DS] = GDT_ENTRY(0x0093, 0, 0x0ffff);
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gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_CS] = GDT_ENTRY(0x809b, 0, 0xfffff);
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gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_DS] = GDT_ENTRY(0x8093, 0, 0xfffff);
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load_gdt(gdt_addr, X86_GDT_NUM_ENTRIES);
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load_ds(X86_GDT_ENTRY_32BIT_DS);
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load_es(X86_GDT_ENTRY_32BIT_DS);
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load_gs(X86_GDT_ENTRY_32BIT_DS);
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load_ss(X86_GDT_ENTRY_32BIT_DS);
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load_fs(X86_GDT_ENTRY_32BIT_FS);
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}
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int __weak x86_cleanup_before_linux(void)
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{
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#ifdef CONFIG_BOOTSTAGE_STASH
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bootstage_stash((void *)CONFIG_BOOTSTAGE_STASH,
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CONFIG_BOOTSTAGE_STASH_SIZE);
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#endif
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return 0;
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}
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/*
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* Cyrix CPUs without cpuid or with cpuid not yet enabled can be detected
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* by the fact that they preserve the flags across the division of 5/2.
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* PII and PPro exhibit this behavior too, but they have cpuid available.
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*/
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/*
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* Perform the Cyrix 5/2 test. A Cyrix won't change
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* the flags, while other 486 chips will.
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*/
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static inline int test_cyrix_52div(void)
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{
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unsigned int test;
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__asm__ __volatile__(
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"sahf\n\t" /* clear flags (%eax = 0x0005) */
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"div %b2\n\t" /* divide 5 by 2 */
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"lahf" /* store flags into %ah */
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: "=a" (test)
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: "0" (5), "q" (2)
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: "cc");
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/* AH is 0x02 on Cyrix after the divide.. */
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return (unsigned char) (test >> 8) == 0x02;
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}
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/*
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* Detect a NexGen CPU running without BIOS hypercode new enough
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* to have CPUID. (Thanks to Herbert Oppmann)
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*/
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static int deep_magic_nexgen_probe(void)
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{
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int ret;
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__asm__ __volatile__ (
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" movw $0x5555, %%ax\n"
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" xorw %%dx,%%dx\n"
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" movw $2, %%cx\n"
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" divw %%cx\n"
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" movl $0, %%eax\n"
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" jnz 1f\n"
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" movl $1, %%eax\n"
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"1:\n"
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: "=a" (ret) : : "cx", "dx");
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return ret;
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}
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static bool has_cpuid(void)
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{
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return flag_is_changeable_p(X86_EFLAGS_ID);
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}
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static bool has_mtrr(void)
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{
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return cpuid_edx(0x00000001) & (1 << 12) ? true : false;
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}
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static int build_vendor_name(char *vendor_name)
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{
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struct cpuid_result result;
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result = cpuid(0x00000000);
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unsigned int *name_as_ints = (unsigned int *)vendor_name;
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name_as_ints[0] = result.ebx;
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name_as_ints[1] = result.edx;
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name_as_ints[2] = result.ecx;
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return result.eax;
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}
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static void identify_cpu(struct cpu_device_id *cpu)
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{
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char vendor_name[16];
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int i;
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vendor_name[0] = '\0'; /* Unset */
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cpu->device = 0; /* fix gcc 4.4.4 warning */
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/* Find the id and vendor_name */
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if (!has_cpuid()) {
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/* Its a 486 if we can modify the AC flag */
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if (flag_is_changeable_p(X86_EFLAGS_AC))
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cpu->device = 0x00000400; /* 486 */
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else
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cpu->device = 0x00000300; /* 386 */
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if ((cpu->device == 0x00000400) && test_cyrix_52div()) {
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memcpy(vendor_name, "CyrixInstead", 13);
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/* If we ever care we can enable cpuid here */
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}
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/* Detect NexGen with old hypercode */
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else if (deep_magic_nexgen_probe())
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memcpy(vendor_name, "NexGenDriven", 13);
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}
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if (has_cpuid()) {
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int cpuid_level;
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cpuid_level = build_vendor_name(vendor_name);
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vendor_name[12] = '\0';
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/* Intel-defined flags: level 0x00000001 */
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if (cpuid_level >= 0x00000001) {
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cpu->device = cpuid_eax(0x00000001);
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} else {
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/* Have CPUID level 0 only unheard of */
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cpu->device = 0x00000400;
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}
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}
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cpu->vendor = X86_VENDOR_UNKNOWN;
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for (i = 0; i < ARRAY_SIZE(x86_vendors); i++) {
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if (memcmp(vendor_name, x86_vendors[i].name, 12) == 0) {
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cpu->vendor = x86_vendors[i].vendor;
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break;
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}
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}
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}
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static inline void get_fms(struct cpuinfo_x86 *c, uint32_t tfms)
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{
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c->x86 = (tfms >> 8) & 0xf;
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c->x86_model = (tfms >> 4) & 0xf;
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c->x86_mask = tfms & 0xf;
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if (c->x86 == 0xf)
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c->x86 += (tfms >> 20) & 0xff;
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if (c->x86 >= 0x6)
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c->x86_model += ((tfms >> 16) & 0xF) << 4;
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}
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int x86_cpu_init_f(void)
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{
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const u32 em_rst = ~X86_CR0_EM;
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const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE;
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/* initialize FPU, reset EM, set MP and NE */
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asm ("fninit\n" \
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"movl %%cr0, %%eax\n" \
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"andl %0, %%eax\n" \
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"orl %1, %%eax\n" \
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"movl %%eax, %%cr0\n" \
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: : "i" (em_rst), "i" (mp_ne_set) : "eax");
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/* identify CPU via cpuid and store the decoded info into gd->arch */
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if (has_cpuid()) {
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struct cpu_device_id cpu;
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struct cpuinfo_x86 c;
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identify_cpu(&cpu);
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get_fms(&c, cpu.device);
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gd->arch.x86 = c.x86;
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gd->arch.x86_vendor = cpu.vendor;
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gd->arch.x86_model = c.x86_model;
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gd->arch.x86_mask = c.x86_mask;
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gd->arch.x86_device = cpu.device;
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gd->arch.has_mtrr = has_mtrr();
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}
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return 0;
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}
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void x86_enable_caches(void)
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{
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unsigned long cr0;
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cr0 = read_cr0();
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cr0 &= ~(X86_CR0_NW | X86_CR0_CD);
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write_cr0(cr0);
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wbinvd();
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}
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void enable_caches(void) __attribute__((weak, alias("x86_enable_caches")));
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void x86_disable_caches(void)
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{
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unsigned long cr0;
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cr0 = read_cr0();
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cr0 |= X86_CR0_NW | X86_CR0_CD;
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wbinvd();
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write_cr0(cr0);
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wbinvd();
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}
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void disable_caches(void) __attribute__((weak, alias("x86_disable_caches")));
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int x86_init_cache(void)
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{
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enable_caches();
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return 0;
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}
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int init_cache(void) __attribute__((weak, alias("x86_init_cache")));
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int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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printf("resetting ...\n");
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/* wait 50 ms */
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udelay(50000);
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disable_interrupts();
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reset_cpu(0);
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/*NOTREACHED*/
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return 0;
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}
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void flush_cache(unsigned long dummy1, unsigned long dummy2)
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{
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asm("wbinvd\n");
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}
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void __attribute__ ((regparm(0))) generate_gpf(void);
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/* segment 0x70 is an arbitrary segment which does not exist */
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asm(".globl generate_gpf\n"
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".hidden generate_gpf\n"
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".type generate_gpf, @function\n"
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"generate_gpf:\n"
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"ljmp $0x70, $0x47114711\n");
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__weak void reset_cpu(ulong addr)
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{
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printf("Resetting using x86 Triple Fault\n");
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set_vector(13, generate_gpf); /* general protection fault handler */
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set_vector(8, generate_gpf); /* double fault handler */
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generate_gpf(); /* start the show */
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}
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int dcache_status(void)
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{
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return !(read_cr0() & 0x40000000);
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}
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/* Define these functions to allow ehch-hcd to function */
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void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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void invalidate_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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void dcache_enable(void)
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{
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enable_caches();
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}
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void dcache_disable(void)
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{
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disable_caches();
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}
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void icache_enable(void)
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{
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}
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void icache_disable(void)
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{
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}
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int icache_status(void)
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{
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return 1;
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}
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void cpu_enable_paging_pae(ulong cr3)
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{
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__asm__ __volatile__(
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/* Load the page table address */
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"movl %0, %%cr3\n"
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/* Enable pae */
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"movl %%cr4, %%eax\n"
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"orl $0x00000020, %%eax\n"
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"movl %%eax, %%cr4\n"
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/* Enable paging */
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"movl %%cr0, %%eax\n"
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"orl $0x80000000, %%eax\n"
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"movl %%eax, %%cr0\n"
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:
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: "r" (cr3)
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: "eax");
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}
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void cpu_disable_paging_pae(void)
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{
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/* Turn off paging */
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__asm__ __volatile__ (
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/* Disable paging */
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"movl %%cr0, %%eax\n"
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"andl $0x7fffffff, %%eax\n"
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"movl %%eax, %%cr0\n"
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/* Disable pae */
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"movl %%cr4, %%eax\n"
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"andl $0xffffffdf, %%eax\n"
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"movl %%eax, %%cr4\n"
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:
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:
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: "eax");
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}
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static bool can_detect_long_mode(void)
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{
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return cpuid_eax(0x80000000) > 0x80000000UL;
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}
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static bool has_long_mode(void)
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{
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return cpuid_edx(0x80000001) & (1 << 29) ? true : false;
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}
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int cpu_has_64bit(void)
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{
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return has_cpuid() && can_detect_long_mode() &&
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has_long_mode();
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}
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const char *cpu_vendor_name(int vendor)
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{
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const char *name;
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name = "<invalid cpu vendor>";
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if ((vendor < (ARRAY_SIZE(x86_vendor_name))) &&
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(x86_vendor_name[vendor] != 0))
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name = x86_vendor_name[vendor];
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return name;
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}
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char *cpu_get_name(char *name)
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{
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unsigned int *name_as_ints = (unsigned int *)name;
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struct cpuid_result regs;
|
|
char *ptr;
|
|
int i;
|
|
|
|
/* This bit adds up to 48 bytes */
|
|
for (i = 0; i < 3; i++) {
|
|
regs = cpuid(0x80000002 + i);
|
|
name_as_ints[i * 4 + 0] = regs.eax;
|
|
name_as_ints[i * 4 + 1] = regs.ebx;
|
|
name_as_ints[i * 4 + 2] = regs.ecx;
|
|
name_as_ints[i * 4 + 3] = regs.edx;
|
|
}
|
|
name[CPU_MAX_NAME_LEN - 1] = '\0';
|
|
|
|
/* Skip leading spaces. */
|
|
ptr = name;
|
|
while (*ptr == ' ')
|
|
ptr++;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
int default_print_cpuinfo(void)
|
|
{
|
|
printf("CPU: %s, vendor %s, device %xh\n",
|
|
cpu_has_64bit() ? "x86_64" : "x86",
|
|
cpu_vendor_name(gd->arch.x86_vendor), gd->arch.x86_device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define PAGETABLE_SIZE (6 * 4096)
|
|
|
|
/**
|
|
* build_pagetable() - build a flat 4GiB page table structure for 64-bti mode
|
|
*
|
|
* @pgtable: Pointer to a 24iKB block of memory
|
|
*/
|
|
static void build_pagetable(uint32_t *pgtable)
|
|
{
|
|
uint i;
|
|
|
|
memset(pgtable, '\0', PAGETABLE_SIZE);
|
|
|
|
/* Level 4 needs a single entry */
|
|
pgtable[0] = (uint32_t)&pgtable[1024] + 7;
|
|
|
|
/* Level 3 has one 64-bit entry for each GiB of memory */
|
|
for (i = 0; i < 4; i++) {
|
|
pgtable[1024 + i * 2] = (uint32_t)&pgtable[2048] +
|
|
0x1000 * i + 7;
|
|
}
|
|
|
|
/* Level 2 has 2048 64-bit entries, each repesenting 2MiB */
|
|
for (i = 0; i < 2048; i++)
|
|
pgtable[2048 + i * 2] = 0x183 + (i << 21UL);
|
|
}
|
|
|
|
int cpu_jump_to_64bit(ulong setup_base, ulong target)
|
|
{
|
|
uint32_t *pgtable;
|
|
|
|
pgtable = memalign(4096, PAGETABLE_SIZE);
|
|
if (!pgtable)
|
|
return -ENOMEM;
|
|
|
|
build_pagetable(pgtable);
|
|
cpu_call64((ulong)pgtable, setup_base, target);
|
|
free(pgtable);
|
|
|
|
return -EFAULT;
|
|
}
|
|
|
|
void show_boot_progress(int val)
|
|
{
|
|
#if MIN_PORT80_KCLOCKS_DELAY
|
|
/*
|
|
* Scale the time counter reading to avoid using 64 bit arithmetics.
|
|
* Can't use get_timer() here becuase it could be not yet
|
|
* initialized or even implemented.
|
|
*/
|
|
if (!gd->arch.tsc_prev) {
|
|
gd->arch.tsc_base_kclocks = rdtsc() / 1000;
|
|
gd->arch.tsc_prev = 0;
|
|
} else {
|
|
uint32_t now;
|
|
|
|
do {
|
|
now = rdtsc() / 1000 - gd->arch.tsc_base_kclocks;
|
|
} while (now < (gd->arch.tsc_prev + MIN_PORT80_KCLOCKS_DELAY));
|
|
gd->arch.tsc_prev = now;
|
|
}
|
|
#endif
|
|
outb(val, POST_PORT);
|
|
}
|