mirror of
https://github.com/checkpoint-restore/criu.git
synced 2026-07-19 09:35:12 +00:00
03b95b5717
The FPU data is quite CPU-type oriented, thus move it to asm/fpu.h. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include "asm/bitops.h"
|
|
#include "asm/types.h"
|
|
#include "asm/cpu.h"
|
|
#include "asm/fpu.h"
|
|
|
|
#include "compiler.h"
|
|
|
|
#include "proc_parse.h"
|
|
#include "util.h"
|
|
#include "log.h"
|
|
|
|
#include "cpu.h"
|
|
|
|
#undef LOG_PREFIX
|
|
#define LOG_PREFIX "cpu: "
|
|
|
|
const char * const x86_cap_flags[NCAPINTS_BITS] = {
|
|
[X86_FEATURE_FPU] = "fpu",
|
|
[X86_FEATURE_FXSR] = "fxsr",
|
|
[X86_FEATURE_XSAVE] = "xsave",
|
|
};
|
|
|
|
static DECLARE_BITMAP(cpu_features, NCAPINTS_BITS);
|
|
#define cpu_has(bit) test_bit(bit, cpu_features)
|
|
|
|
void cpu_set_feature(unsigned int feature)
|
|
{
|
|
if (likely(feature < NCAPINTS_BITS))
|
|
set_bit(feature, cpu_features);
|
|
}
|
|
|
|
bool cpu_has_feature(unsigned int feature)
|
|
{
|
|
if (likely(feature < NCAPINTS_BITS))
|
|
return cpu_has(feature);
|
|
return false;
|
|
}
|
|
|
|
static int proc_cpuinfo_match(char *tok)
|
|
{
|
|
if (!strcmp(tok, x86_cap_flags[X86_FEATURE_FXSR]))
|
|
cpu_set_feature(X86_FEATURE_FXSR);
|
|
else if (!strcmp(tok, x86_cap_flags[X86_FEATURE_XSAVE]))
|
|
cpu_set_feature(X86_FEATURE_XSAVE);
|
|
else if (!strcmp(tok, x86_cap_flags[X86_FEATURE_FPU]))
|
|
cpu_set_feature(X86_FEATURE_FPU);
|
|
return 0;
|
|
}
|
|
|
|
int cpu_init(void)
|
|
{
|
|
if (parse_cpuinfo_features(proc_cpuinfo_match))
|
|
return -1;
|
|
|
|
BUILD_BUG_ON(sizeof(struct xsave_struct) != XSAVE_SIZE);
|
|
BUILD_BUG_ON(sizeof(struct i387_fxsave_struct) != FXSAVE_SIZE);
|
|
|
|
/*
|
|
* Make sure that at least FPU is onboard
|
|
* and fxsave is supported.
|
|
*/
|
|
if (cpu_has(X86_FEATURE_FPU)) {
|
|
if (!cpu_has(X86_FEATURE_FXSR)) {
|
|
pr_err("missing support fxsave/restore insns\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
pr_debug("fpu:%d fxsr:%d xsave:%d\n",
|
|
!!cpu_has(X86_FEATURE_FPU),
|
|
!!cpu_has(X86_FEATURE_FXSR),
|
|
!!cpu_has(X86_FEATURE_XSAVE));
|
|
|
|
return 0;
|
|
}
|