pciinit: Align start of PCI memory on i440 chipset.

Align the start of PCI memory space to simplify mtrr ranges.  This is
configured per chipset so future chipsets can configure different
start addresses.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

diff --git a/src/pciinit.c b/src/pciinit.c
index d61f0a8dd089ebd5a2ac64c633985a0f2d8747a2..0e87ab0baec62a243fc0e91203e315777491e8bf 100644 (file)
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -225,6 +225,33 @@ static void pci_bios_init_devices(void)
 }
 
 
+/****************************************************************
+ * Platform device initialization
+ ****************************************************************/
+
+void i440fx_mem_addr_init(struct pci_device *dev, void *arg)
+{
+    if (RamSize <= 0x80000000)
+        pcimem_start = 0x80000000;
+    else if (RamSize <= 0xc0000000)
+        pcimem_start = 0xc0000000;
+}
+
+static const struct pci_device_id pci_platform_tbl[] = {
+    PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441,
+               i440fx_mem_addr_init),
+    PCI_DEVICE_END
+};
+
+static void pci_bios_init_platform(void)
+{
+    struct pci_device *pci;
+    foreachpci(pci) {
+        pci_init_device(pci_platform_tbl, pci, NULL);
+    }
+}
+
+
 /****************************************************************
  * Bus initialization
  ****************************************************************/
@@ -583,8 +610,6 @@ static void pci_region_map_entries(struct pci_bus *busses, struct pci_region *r)
 
 static void pci_bios_map_devices(struct pci_bus *busses)
 {
-    pcimem_start = RamSize;
-
     if (pci_bios_init_root_regions(busses)) {
         struct pci_region r64_mem, r64_pref;
         r64_mem.list = NULL;
@@ -647,6 +672,9 @@ pci_setup(void)
     dprintf(1, "=== PCI device probing ===\n");
     pci_probe_devices();
 
+    pcimem_start = RamSize;
+    pci_bios_init_platform();
+
     dprintf(1, "=== PCI new allocation pass #1 ===\n");
     struct pci_bus *busses = malloc_tmp(sizeof(*busses) * (MaxPCIBus + 1));
     if (!busses) {