readbios.c

来自「linux内核」· C语言 代码 · 共 17 行

#include <com32.h>
#include <string.h>
#include "pci/pci.h"

uint32_t __pci_read_bios(uint32_t call, pciaddr_t a)
{
  com32sys_t rs;
  memset(&rs, 0, sizeof rs);
  rs.eax.w[0] = call;
  rs.ebx.w[0] = a >> 8;		/* bus:device:function */
  rs.edi.b[0] = a;		/* address:reg */
  __intcall(0x1a, &rs, &rs);
  
  return (rs.eflags.l & EFLAGS_CF) ? ~(uint32_t)0 : rs.ecx.l;
}