com32/sysdump/memory.c

   1 /*
   2  * Dump memory
   3  */
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <sys/cpu.h>
   9 #include "sysdump.h"
  10 #include "backend.h"
  11
  12 static char *lowmem;
  13 static size_t lowmem_len;
  14
  15 void *zero_addr;                /* Hack to keep gcc from complaining */
  16
  17 void snapshot_lowmem(void)
  18 {
  19     extern void _start(void);
  20
  21     lowmem_len = (size_t)_start;
  22     lowmem = malloc(lowmem_len);
  23     if (lowmem) {
  24         printf("Snapshotting lowmem... ");
  25         cli();
  26         memcpy(lowmem, zero_addr, lowmem_len);
  27         sti();
  28         printf("ok\n");
  29     }
  30 }
  31
  32 static void dump_memory_range(struct backend *be, const void *where,
  33                               const void *addr, size_t len)
  34 {
  35     char filename[32];
  36
  37     sprintf(filename, "memory/%08zx", (size_t)addr);
  38     cpio_writefile(be, filename, where, len);
  39 }
  40
  41 void dump_memory(struct backend *be)
  42 {
  43     printf("Dumping memory... ");
  44
  45     cpio_mkdir(be, "memory");
  46
  47     if (lowmem)
  48         dump_memory_range(be, lowmem, zero_addr, lowmem_len);
  49
  50     printf("done.\n");
  51 }