linux/arch/x86/boot/cpucheck.c

// SPDX-License-Identifier: GPL-2.0-only
/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 * ----------------------------------------------------------------------- */

/*
 * Check for obligatory CPU features and abort if the features are not
 * present.  This code should be compilable as 16-, 32- or 64-bit
 * code, so be very careful with types and inline assembly.
 *
 * This code should not contain any messages; that requires an
 * additional wrapper.
 *
 * As written, this code is not safe for inclusion into the kernel
 * proper (after FPU initialization, in particular).
 */

#ifdef _SETUP
# include "boot.h"
#endif
#include <linux/types.h>
#include <asm/intel-family.h>
#include <asm/processor-flags.h>
#include <asm/required-features.h>
#include <asm/msr-index.h>
#include "string.h"
#include "msr.h"

static u32 err_flags[NCAPINTS];

static const int req_level = …;

static const u32 req_flags[NCAPINTS] = …;

#define A32(a, b, c, d) …

static int is_amd(void)
{ … }

static int is_centaur(void)
{ … }

static int is_transmeta(void)
{ … }

static int is_intel(void)
{ … }

/* Returns a bitmask of which words we have error bits in */
static int check_cpuflags(void)
{ … }

/*
 * Returns -1 on error.
 *
 * *cpu_level is set to the current CPU level; *req_level to the required
 * level.  x86-64 is considered level 64 for this purpose.
 *
 * *err_flags_ptr is set to the flags error array if there are flags missing.
 */
int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr)
{ … }

int check_knl_erratum(void)
{ … }