66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* pci.c - Generic PCI interfaces. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/pci.h>
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grub_pci_address_t
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grub_pci_make_address (grub_pci_device_t dev, int reg)
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{
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return (1 << 31) | (dev.bus << 16) | (dev.device << 11)
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| (dev.function << 8) | reg;
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}
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void
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grub_pci_iterate (grub_pci_iteratefunc_t hook)
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{
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grub_pci_device_t dev;
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grub_pci_address_t addr;
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grub_pci_id_t id;
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grub_uint32_t hdr;
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for (dev.bus = 0; dev.bus < GRUB_PCI_NUM_BUS; dev.bus++)
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{
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for (dev.device = 0; dev.device < GRUB_PCI_NUM_DEVICES; dev.device++)
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{
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for (dev.function = 0; dev.function < 8; dev.function++)
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{
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_PCI_ID);
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id = grub_pci_read (addr);
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/* Check if there is a device present. */
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if (id >> 16 == 0xFFFF)
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continue;
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if (hook (dev, id))
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return;
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/* Probe only func = 0 if the device if not multifunction */
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if (dev.function == 0)
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{
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addr = grub_pci_make_address (dev, GRUB_PCI_REG_CACHELINE);
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hdr = grub_pci_read (addr);
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if (!(hdr & 0x800000))
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break;
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}
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}
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}
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}
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}
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