[SeaBIOS] [RFC 1/2] fw/pciinit: Recognize pxb-pcie-dev device

[Zihan Yang]

QEMU q35 uses pxb-pcie-dev to enable multiple host bridges, this patch
recognizes such devices in seabios and add corresponding e820 entry.

MCFG base and size are already setup in QEMU, we just need to read it

Signed-off-by: Zihan Yang 
---
 src/fw/paravirt.c |  1 -
 src/fw/pciinit.c  | 17 +++++++++++++++++
 src/hw/pci_ids.h  |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index 0770c47..6b14542 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -197,7 +197,6 @@ qemu_platform_setup(void)
         if (!loader_err)
             warn_internalerror();
     }
-
     acpi_setup();
 }

diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
index 3a2f747..6e6a434 100644
--- a/src/fw/pciinit.c
+++ b/src/fw/pciinit.c
@@ -507,11 +507,28 @@ static void mch_mem_addr_setup(struct pci_device *dev, void *arg)
         pci_io_low_end = acpi_pm_base;
 }

+static void pxb_mem_addr_setup(struct pci_device *dev, void *arg)
+{
+    union u64_u32_u mcfg_base;
+    mcfg_base.lo = pci_config_readl(dev->bdf, Q35_HOST_BRIDGE_PCIEXBAR);
+    mcfg_base.hi = pci_config_readl(dev->bdf, Q35_HOST_BRIDGE_PCIEXBAR + 4);
+
+    // Fix me! Use another meaningful macro
+    u32 mcfg_size = pci_config_readl(dev->bdf, Q35_HOST_BRIDGE_PCIEXBAR + 8);
+
+    /* Skip config write here as the qemu-level objects are already setup, we
+     * read mcfg_base and mcfg_size from it just now. Instead, we directly add
+     * this item to e820 */
+    e820_add(mcfg_base.val, mcfg_size, E820_RESERVED);
+}
+
 static const struct pci_device_id pci_platform_tbl[] = {
     PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441,
                i440fx_mem_addr_setup),
     PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_Q35_MCH,
                mch_mem_addr_setup),
+    PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PXB_HOST,
+               pxb_mem_addr_setup),
     PCI_DEVICE_END
 };

diff --git a/src/hw/pci_ids.h b/src/hw/pci_ids.h
index 38fa2ca..35096ea 100644
--- a/src/hw/pci_ids.h
+++ b/src/hw/pci_ids.h
@@ -2265,6 +2265,7 @@

#define PCI_VENDOR_ID_REDHAT		0x1b36
 #define PCI_DEVICE_ID_REDHAT_ROOT_PORT	0x000C
+#define PCI_DEVICE_ID_REDHAT_PXB_HOST	0x000B

#define PCI_VENDOR_ID_TEKRAM		0x1de1
 #define PCI_DEVICE_ID_TEKRAM_DC290	0xdc29