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Diffstat (limited to 'hw/piix_pci.c')
-rw-r--r--hw/piix_pci.c69
1 files changed, 35 insertions, 34 deletions
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 537fc19..5bca41d 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -69,8 +69,8 @@ typedef struct PIIX3State {
} PIIX3State;
typedef struct PAMMemoryRegion {
- MemoryRegion mem;
- bool initialized;
+ MemoryRegion alias[4]; /* index = PAM value */
+ unsigned current;
} PAMMemoryRegion;
struct PCII440FXState {
@@ -105,37 +105,35 @@ static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
return (pci_intx + slot_addend) & 3;
}
-static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r,
- PAMMemoryRegion *mem)
+static void init_pam(PCII440FXState *d, PAMMemoryRegion *mem,
+ uint32_t start, uint32_t size)
{
- if (mem->initialized) {
- memory_region_del_subregion(d->system_memory, &mem->mem);
- memory_region_destroy(&mem->mem);
- }
+ int i;
- // printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
- switch(r) {
- case 3:
- /* RAM */
- memory_region_init_alias(&mem->mem, "pam-ram", d->ram_memory,
- start, end - start);
- break;
- case 1:
- /* ROM (XXX: not quite correct) */
- memory_region_init_alias(&mem->mem, "pam-rom", d->ram_memory,
- start, end - start);
- memory_region_set_readonly(&mem->mem, true);
- break;
- case 2:
- case 0:
- /* XXX: should distinguish read/write cases */
- memory_region_init_alias(&mem->mem, "pam-pci", d->pci_address_space,
- start, end - start);
- break;
+ /* RAM */
+ memory_region_init_alias(&mem->alias[3], "pam-ram", d->ram_memory, start, size);
+ /* ROM (XXX: not quite correct) */
+ memory_region_init_alias(&mem->alias[1], "pam-rom", d->ram_memory, start, size);
+ memory_region_set_readonly(&mem->alias[1], true);
+
+ /* XXX: should distinguish read/write cases */
+ memory_region_init_alias(&mem->alias[0], "pam-pci", d->pci_address_space,
+ start, size);
+ memory_region_init_alias(&mem->alias[2], "pam-pci", d->pci_address_space,
+ start, size);
+
+ for (i = 0; i < 4; ++i) {
+ memory_region_set_enabled(&mem->alias[i], false);
+ memory_region_add_subregion_overlap(d->system_memory, start, &mem->alias[i], 1);
}
- memory_region_add_subregion_overlap(d->system_memory,
- start, &mem->mem, 1);
- mem->initialized = true;
+ mem->current = 0;
+}
+
+static void update_pam(PAMMemoryRegion *pam, unsigned r)
+{
+ memory_region_set_enabled(&pam->alias[pam->current], false);
+ pam->current = r;
+ memory_region_set_enabled(&pam->alias[pam->current], true);
}
static void i440fx_update_memory_mappings(PCII440FXState *d)
@@ -145,12 +143,10 @@ static void i440fx_update_memory_mappings(PCII440FXState *d)
bool smram_enabled;
memory_region_transaction_begin();
- update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3,
- &d->pam_regions[0]);
+ update_pam(&d->pam_regions[0], (d->dev.config[I440FX_PAM] >> 4) & 3);
for(i = 0; i < 12; i++) {
r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
- update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r,
- &d->pam_regions[i+1]);
+ update_pam(&d->pam_regions[i+1], r);
}
smram = d->dev.config[I440FX_SMRAM];
smram_enabled = (d->smm_enabled && (smram & 0x08)) || (smram & 0x40);
@@ -272,6 +268,7 @@ static PCIBus *i440fx_common_init(const char *device_name,
PCIHostState *s;
PIIX3State *piix3;
PCII440FXState *f;
+ unsigned i;
dev = qdev_create(NULL, "i440FX-pcihost");
s = PCI_HOST_BRIDGE(dev);
@@ -303,6 +300,10 @@ static PCIBus *i440fx_common_init(const char *device_name,
memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
&f->smram_region, 1);
memory_region_set_enabled(&f->smram_region, false);
+ init_pam(f, &f->pam_regions[0], 0xf0000, 0x10000);
+ for (i = 0; i < 12; ++i) {
+ init_pam(f, &f->pam_regions[i+1], 0xc0000 + i * 0x4000, 0x4000);
+ }
/* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also