[Qemu-devel] [PATCH v2 06/10] raven: set a correct PCI memory region

["Hervé Poussineau" <hpoussin@reactos.org>]

PCI memory region is 0x3f000000 bytes starting at 0xc0000000.

However, keep compatibility with Open Hack'Ware expectations
by adding a hack for Open Hack'Ware display.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
---
 hw/pci-host/prep.c |    9 ++++++---
 hw/ppc/prep.c      |    9 +++++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index af0bf2b..bba76af 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -54,6 +54,7 @@ typedef struct PRePPCIState {
     qemu_irq irq[PCI_NUM_PINS];
     PCIBus pci_bus;
     MemoryRegion pci_io;
+    MemoryRegion pci_memory;
     MemoryRegion pci_intack;
     RavenPCIState pci_dev;
 } PREPPCIState;
@@ -127,8 +128,6 @@ static void raven_pcihost_realizefn(DeviceState *d, Error **errp)
     MemoryRegion *address_space_mem = get_system_memory();
     int i;
 
-    isa_mem_base = 0xc0000000;
-
     for (i = 0; i < PCI_NUM_PINS; i++) {
         sysbus_init_irq(dev, &s->irq[i]);
     }
@@ -162,11 +161,15 @@ static void raven_pcihost_initfn(Object *obj)
     DeviceState *pci_dev;
 
     memory_region_init(&s->pci_io, obj, "pci-io", 0x3f800000);
+    /* Open Hack'Ware hack: real size should be only 0x3f000000 bytes */
+    memory_region_init(&s->pci_memory, obj, "pci-memory",
+                       0x3f000000 + 0xc0000000ULL);
 
     /* CPU address space */
     memory_region_add_subregion(address_space_mem, 0x80000000, &s->pci_io);
+    memory_region_add_subregion(address_space_mem, 0xc0000000, &s->pci_memory);
     pci_bus_new_inplace(&s->pci_bus, DEVICE(obj), NULL,
-                        address_space_mem, &s->pci_io, 0, TYPE_PCI_BUS);
+                        &s->pci_memory, &s->pci_io, 0, TYPE_PCI_BUS);
 
     h->bus = &s->pci_bus;
 
diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index 6df4324..e75c4f0 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -466,6 +466,7 @@ static void ppc_prep_init(QEMUMachineInitArgs *args)
     int linux_boot, i, nb_nics1;
     MemoryRegion *ram = g_new(MemoryRegion, 1);
     MemoryRegion *bios = g_new(MemoryRegion, 1);
+    MemoryRegion *vga = g_new(MemoryRegion, 1);
     uint32_t kernel_base, initrd_base;
     long kernel_size, initrd_size;
     DeviceState *dev;
@@ -604,6 +605,14 @@ static void ppc_prep_init(QEMUMachineInitArgs *args)
 
     /* init basic PC hardware */
     pci_vga_init(pci_bus);
+    /* Open Hack'Ware hack: PCI BAR#0 is programmed to 0xf0000000.
+     * While bios will access framebuffer at 0xf0000000, real physical
+     * address is 0xf0000000 + 0xc0000000 (PCI memory base).
+     * Alias the wrong memory accesses to the right place.
+     */
+    memory_region_init_alias(vga, NULL, "vga-alias", pci_address_space(pci),
+                             0xf0000000, 0x1000000);
+    memory_region_add_subregion_overlap(sysmem, 0xf0000000, vga, 10);
 
     nb_nics1 = nb_nics;
     if (nb_nics1 > NE2000_NB_MAX)
-- 
1.7.10.4