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From 9ee22b4f743a2850fed35f179c56f94ce4bb5242 Mon Sep 17 00:00:00 2001
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From: Adam Jackson <ajax@redhat.com>
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Date: Tue, 3 Mar 2009 10:58:33 -0500
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Subject: [PATCH] Primary video device hack
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---
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hw/xfree86/common/xf86pciBus.c | 54 ++++++++++++++++++++++++++++++++++-----
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1 files changed, 47 insertions(+), 7 deletions(-)
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diff --git a/hw/xfree86/common/xf86pciBus.c b/hw/xfree86/common/xf86pciBus.c
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index 467a0c3..f9999d8 100644
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--- a/hw/xfree86/common/xf86pciBus.c
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+++ b/hw/xfree86/common/xf86pciBus.c
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@@ -341,6 +341,39 @@ restorePciBusState(BusAccPtr ptr)
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}
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#undef MASKBITS
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+/* oh god what have i done */
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+static Bool
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+looks_like_bios_primary(struct pci_device *info)
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+{
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+ unsigned char *bios;
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+ unsigned short vendor, device;
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+ int offset;
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+ Bool ret = FALSE;
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+
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+ bios = xf86MapVidMem(-1, VIDMEM_MMIO, 0xc0000, 0x10000);
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+ if (!bios)
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+ return FALSE;
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+
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+ if (bios[0] != 0x55 || bios[1] != 0xAA)
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+ goto out;
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+
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+ offset = (bios[0x19] << 8) + bios[0x18];
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+
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+ if (bios[offset] != 'P' ||
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+ bios[offset+1] != 'C' ||
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+ bios[offset+2] != 'I' ||
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+ bios[offset+3] != 'R')
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+ goto out;
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+
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+ vendor = (bios[offset+5] << 8) + bios[offset+4];
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+ device = (bios[offset+7] << 8) + bios[offset+6];
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+
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+ ret = (info->vendor_id == vendor) && (info->device_id == device);
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+
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+out:
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+ xf86UnMapVidMem(-1, bios, 0x10000);
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+ return ret;
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+}
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/*
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* xf86Bus.c interface
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@@ -375,24 +408,31 @@ xf86PciProbe(void)
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}
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}
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-
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/* If we haven't found a primary device try a different heuristic */
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if (primaryBus.type == BUS_NONE && num) {
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for (i = 0; i < num; i++) {
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uint16_t command;
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info = xf86PciVideoInfo[i];
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+ if (!IS_VGA(info->device_class))
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+ continue;
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+
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pci_device_cfg_read_u16(info, & command, 4);
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- if ((command & PCI_CMD_MEM_ENABLE)
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- && ((num == 1) || IS_VGA(info->device_class))) {
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- if (primaryBus.type == BUS_NONE) {
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+ if ((command & PCI_CMD_MEM_ENABLE)) {
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+ if (num == 1) {
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primaryBus.type = BUS_PCI;
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primaryBus.id.pci = info;
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- } else {
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- xf86Msg(X_NOTICE,
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+ break;
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+ } else if (looks_like_bios_primary(info)) {
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+ if (primaryBus.type == BUS_NONE) {
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+ primaryBus.type = BUS_PCI;
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+ primaryBus.id.pci = info;
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+ } else {
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+ xf86Msg(X_NOTICE,
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"More than one possible primary device found\n");
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- primaryBus.type ^= (BusType)(-1);
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+ primaryBus.type ^= (BusType)(-1);
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+ }
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}
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}
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}
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--
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1.6.1.3
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