diff options
Diffstat (limited to 'core/dmi.c')
| -rw-r--r-- | core/dmi.c | 55 |
1 files changed, 55 insertions, 0 deletions
@@ -31,6 +31,8 @@ #include <string.h> #include <stdio.h> +#include <sys/bitops.h> +#include <sys/cpu.h> #include <syslinux/sysappend.h> #include "core.h" @@ -308,10 +310,63 @@ static void sysappend_set_sysff(const uint8_t *type) sysappend_strings[SYSAPPEND_SYSFF] = sysff_str; } +struct cpuflag { + uint8_t bit; + char flag; +}; + +static void sysappend_set_cpu(void) +{ + static char cpu_str[6+6] = "CPU="; + char *p = cpu_str + 4; + static const struct cpuflag cpuflags[] = { + { 0*32+ 6, 'P' }, /* PAE */ + { 1*32+ 5, 'V' }, /* VMX */ + { 1*32+ 6, 'T' }, /* SMX (TXT) */ + { 2*32+20, 'X' }, /* XD/NX */ + { 2*32+29, 'L' }, /* Long mode (x86-64) */ + { 3*32+ 2, 'S' }, /* SVM */ + { 0, 0 } + }; + const struct cpuflag *cf; + + /* Not technically from DMI, but it fit here... */ + + if (!cpu_has_eflag(EFLAGS_ID)) { + /* No CPUID */ + *p++ = cpu_has_eflag(EFLAGS_AC) ? '4' : '3'; + } else { + uint32_t flags[4], eax, ebx, family; + uint32_t std_level, ext_level; + + cpuid(1, &eax, &ebx, &flags[1], &flags[0]); + family = (eax & 0x0ff00f00) >> 8; + *p++ = family >= 6 ? '6' : family + '0'; + + ext_level = cpuid_eax(0x80000000); + if (ext_level >= 0x80000001 && ext_level <= 0x8000ffff) { + cpuid(0x80000001, &eax, &ebx, &flags[3], &flags[2]); + } else { + flags[2] = flags[3] = 0; + } + + for (cf = cpuflags; cf->flag; cf++) { + if (test_bit(cf->bit, flags)) + *p++ = cf->flag; + } + } + + *p = '\0'; + + sysappend_strings[SYSAPPEND_CPU] = cpu_str; +} + void dmi_init(void) { const struct sysappend_dmi_strings *ds; + sysappend_set_cpu(); + dmi_find_header(); if (!dmi) return; |