grub/bus/pci.c
proski f6ce7629ad 2008-04-05 Pavel Roskin <proski@gnu.org>
* bus/pci.c (grub_pci_iterate): For multifunction devices, probe
	all 8 functions.  Otherwise, probe function 0 only.
2008-04-05 07:20:29 +00:00

66 lines
1.7 KiB
C

/* pci.c - Generic PCI interfaces. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/pci.h>
grub_pci_address_t
grub_pci_make_address (int bus, int device, int function, int reg)
{
return (1 << 31) | (bus << 16) | (device << 11) | (function << 8) | (reg << 2);
}
void
grub_pci_iterate (grub_pci_iteratefunc_t hook)
{
int bus;
int dev;
int func;
grub_pci_address_t addr;
grub_pci_id_t id;
grub_uint32_t hdr;
for (bus = 0; bus < 256; bus++)
{
for (dev = 0; dev < 32; dev++)
{
for (func = 0; func < 8; func++)
{
addr = grub_pci_make_address (bus, dev, func, 0);
id = grub_pci_read (addr);
/* Check if there is a device present. */
if (id >> 16 == 0xFFFF)
continue;
if (hook (bus, dev, func, id))
return;
/* Probe only func = 0 if the device if not multifunction */
if (func == 0)
{
addr = grub_pci_make_address (bus, dev, func, 3);
hdr = grub_pci_read (addr);
if (!(hdr & 0x800000))
break;
}
}
}
}
}