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https://github.com/mpv-player/mpv
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61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
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/*
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This file is based on:
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$XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
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Modified for readability by Nick Kurshev
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*/
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static int pci_config_type( void )
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{
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unsigned long tmplong1, tmplong2;
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unsigned char tmp1, tmp2;
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int retval;
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retval = 0;
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outb(PCI_MODE2_ENABLE_REG, 0x00);
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outb(PCI_MODE2_FORWARD_REG, 0x00);
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tmp1 = inb(PCI_MODE2_ENABLE_REG);
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tmp2 = inb(PCI_MODE2_FORWARD_REG);
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if ((tmp1 == 0x00) && (tmp2 == 0x00)) {
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retval = 2;
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/*printf("PCI says configuration type 2\n");*/
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} else {
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tmplong1 = inl(PCI_MODE1_ADDRESS_REG);
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outl(PCI_MODE1_ADDRESS_REG, PCI_EN);
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tmplong2 = inl(PCI_MODE1_ADDRESS_REG);
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outl(PCI_MODE1_ADDRESS_REG, tmplong1);
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if (tmplong2 == PCI_EN) {
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retval = 1;
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/*printf("PCI says configuration type 1\n");*/
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} else {
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/*printf("No PCI !\n");*/
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disable_os_io();
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/*exit(1);*/
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retval = 0xFFFF;
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}
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}
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return retval;
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}
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static int pci_get_vendor(
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unsigned char bus,
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unsigned char dev,
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int func)
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{
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unsigned long config_cmd;
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config_cmd = PCI_EN | (bus<<16) | (dev<<11) | (func<<8);
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outl(PCI_MODE1_ADDRESS_REG, config_cmd);
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return inl(PCI_MODE1_DATA_REG);
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}
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static long pci_config_read_long(
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unsigned char bus,
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unsigned char dev,
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int func,
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unsigned cmd)
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{
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unsigned long config_cmd;
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config_cmd = PCI_EN | (bus<<16) | (dev<<11) | (func<<8);
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outl(PCI_MODE1_ADDRESS_REG, config_cmd | cmd);
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return inl(PCI_MODE1_DATA_REG);
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}
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