qboot: enable mmconfig

Need to enable mmconfig in qboot and also need to reserve
mmconfig space in bios.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <1490869973-4562-1-git-send-email-yang.zhong@intel.com>
[Do not affect e820 memory map on i440FX chipset. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/hwsetup.c b/hwsetup.c
index 0e186eb..e8a452e 100644
--- a/hwsetup.c
+++ b/hwsetup.c
@@ -127,3 +127,31 @@ void setup_hw(void)
 
 	setup_pic();
 }
+
+#define Q35_HOST_BRIDGE_PCIEXBAREN      1
+#define Q35_HOST_BRIDGE_PCIEXBAR        0x60
+
+static void setup_q35_mmconfig(void)
+{
+	const int bdf = 0;
+	uint64_t addr = PCIE_MMCONFIG_BASE;
+	uint32_t upper = addr >> 32;
+	uint32_t lower = (addr & 0xffffffff) | Q35_HOST_BRIDGE_PCIEXBAREN;
+
+	pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, 0);
+	pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR + 4, upper);
+	pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, lower);
+}
+
+bool setup_mmconfig(void)
+{
+	const int bdf = 0;
+	uint32_t id = pci_config_readl(bdf, 0);
+
+	if (id == (PCI_VENDOR_ID_INTEL | (PCI_DEVICE_ID_INTEL_Q35_MCH << 16))) {
+		setup_q35_mmconfig();
+		return true;
+	}
+
+	return false;
+}