1/* 2 * Dump CPUID information 3 */ 4 5#include <stdio.h> 6#include <string.h> 7#include <stdlib.h> 8#include <com32.h> 9#include <sys/cpu.h> 10#include "sysdump.h" 11 12struct cpuid_data { 13 uint32_t eax, ebx, ecx, edx; 14}; 15 16struct cpuid_info { 17 uint32_t eax, ecx; 18 struct cpuid_data data; 19}; 20 21static void get_cpuid(uint32_t eax, uint32_t ecx, struct cpuid_data *data) 22{ 23#if __SIZEOF_POINTER__ == 4 24 asm("pushl %%ebx ; cpuid ; movl %%ebx,%1 ; popl %%ebx" 25 : "=a" (data->eax), "=r" (data->ebx), 26 "=c" (data->ecx), "=d" (data->edx) 27 : "a" (eax), "c" (ecx)); 28#elif __SIZEOF_POINTER__ == 8 29 asm volatile("push %%rbx; cpuid; movl %%ebx, %1; pop %%rbx" 30 : "=a" (data->eax), 31 "=b" (data->ebx), 32 "=c" (data->ecx), 33 "=d" (data->edx) 34 : "a" (eax), "c" (ecx)); 35#else 36#error "unsupported architecture" 37#endif 38} 39 40#define CPUID_CHUNK 128 41 42void dump_cpuid(struct upload_backend *be) 43{ 44 struct cpuid_info *buf = NULL; 45 int nentry, nalloc; 46 uint32_t region; 47 struct cpuid_data base_leaf; 48 uint32_t base, leaf, count; 49 struct cpuid_data invalid_leaf; 50 struct cpuid_data data; 51 52 if (!cpu_has_eflag(EFLAGS_ID)) 53 return; 54 55 printf("Dumping CPUID... "); 56 57 nentry = nalloc = 0; 58 59 /* Find out what the CPU returns for invalid leaves */ 60 get_cpuid(0, 0, &base_leaf); 61 get_cpuid(base_leaf.eax+1, 0, &invalid_leaf); 62 63 for (region = 0 ; region <= 0xffff ; region++) { 64 base = region << 16; 65 66 get_cpuid(base, 0, &base_leaf); 67 if (region && !memcmp(&base_leaf, &invalid_leaf, sizeof base_leaf)) 68 continue; 69 70 if ((base_leaf.eax ^ base) & 0xffff0000) 71 continue; 72 73 for (leaf = base ; leaf <= base_leaf.eax ; leaf++) { 74 get_cpuid(leaf, 0, &data); 75 count = 0; 76 77 do { 78 if (nentry >= nalloc) { 79 nalloc += CPUID_CHUNK; 80 buf = realloc(buf, nalloc*sizeof *buf); 81 if (!buf) 82 return; /* FAILED */ 83 } 84 buf[nentry].eax = leaf; 85 buf[nentry].ecx = count; 86 buf[nentry].data = data; 87 nentry++; 88 count++; 89 90 get_cpuid(leaf, count, &data); 91 } while (memcmp(&data, &buf[nentry-1].data, sizeof data) && 92 (data.eax | data.ebx | data.ecx | data.edx)); 93 } 94 } 95 96 if (nentry) 97 cpio_writefile(be, "cpuid", buf, nentry*sizeof *buf); 98 free(buf); 99 100 printf("done.\n"); 101} 102