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On amd64 and i386, dump the VGA BIOS found at the canonical address 0xc0000

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if a VGA device doesn't have its expansion ROM base address register set.

ok oga@, miod@
This commit is contained in:
kettenis 2010-03-01 19:00:47 +00:00
parent dc4a18554e
commit 8b86f50e88
1 changed files with 51 additions and 9 deletions
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60
usr.sbin/pcidump/pcidump.c
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@ -1,4 +1,4 @@
/* $OpenBSD: pcidump.c,v 1.21 2009/11/06 23:59:14 kettenis Exp $ */
/* $OpenBSD: pcidump.c,v 1.22 2010/03/01 19:00:47 kettenis Exp $ */
/*
* Copyright (c) 2006, 2007 David Gwynne <loki@animata.net>
@ -16,21 +16,23 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/pciio.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pcidevs_data.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define PCIDEV "/dev/pci"
__dead void usage(void);
@ -43,6 +45,7 @@ int pci_nfuncs(int, int);
int pci_read(int, int, int, u_int32_t, u_int32_t *);
void dump_caplist(int, int, int, u_int8_t);
int dump_rom(int, int, int);
int dump_vga_bios(void);
__dead void
usage(void)
@ -611,6 +614,15 @@ int
dump_rom(int bus, int dev, int func)
{
struct pci_rom rom;
u_int32_t cr, addr;
if (pci_read(bus, dev, func, PCI_ROM_REG, &addr) != 0 ||
pci_read(bus, dev, func, PCI_CLASS_REG, &cr) != 0)
return (errno);
if (addr == 0 && PCI_CLASS(cr) == PCI_CLASS_DISPLAY &&
PCI_SUBCLASS(cr) == PCI_SUBCLASS_DISPLAY_VGA)
return dump_vga_bios();
bzero(&rom, sizeof(rom));
rom.pr_sel.pc_bus = bus;
@ -631,3 +643,33 @@ dump_rom(int bus, int dev, int func)
return (0);
}
#define VGA_BIOS_ADDR 0xc0000
#define VGA_BIOS_LEN 0x10000
int
dump_vga_bios(void)
{
#if defined(__amd64__) || defined(__i386__)
void *bios;
int fd;
fd = open(_PATH_MEM, O_RDONLY, 0777);
if (fd == -1)
err(1, "%s", _PATH_MEM);
bios = malloc(VGA_BIOS_LEN);
if (bios == NULL)
return (ENOMEM);
if (pread(fd, bios, VGA_BIOS_LEN, VGA_BIOS_ADDR) == -1)
err(1, "%s", _PATH_MEM);
if (write(romfd, bios, VGA_BIOS_LEN) == -1)
return (errno);
return (0);
#else
return (ENODEV);
#endif
}