#include "pci.h" // pci_config_writeb
#include "config.h" // CONFIG_*
#include "pci_ids.h" // PCI_VENDOR_ID_INTEL
-#include "dev-i440fx.h"
+#include "pci_regs.h" // PCI_VENDOR_ID
+#include "xen.h" // usingXen
// On the emulators, the bios at 0xf0000 is also at 0xffff0000
#define BIOS_SRC_OFFSET 0xfff00000
+#define I440FX_PAM0 0x59
+
// Enable shadowing and copy bios.
static void
__make_bios_writable_intel(u16 bdf, u32 pam0)
, code32flat_end - code32flat_start);
}
-void
+static void
make_bios_writable_intel(u16 bdf, u32 pam0)
{
int reg = pci_config_readb(bdf, pam0);
__make_bios_writable_intel(bdf, pam0);
}
-void
+static void
make_bios_readonly_intel(u16 bdf, u32 pam0)
{
// Flush any pending writes before locking memory.
pci_config_writeb(bdf, pam0, 0x10);
}
-static const struct pci_device_id dram_controller_make_writable_tbl[] = {
+static void i440fx_bios_make_readonly(struct pci_device *pci, void *arg)
+{
+ make_bios_readonly_intel(pci->bdf, I440FX_PAM0);
+}
+
+static const struct pci_device_id dram_controller_make_readonly_tbl[] = {
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441,
- i440fx_bios_make_writable),
+ i440fx_bios_make_readonly),
PCI_DEVICE_END
};
void
make_bios_writable(void)
{
- if (CONFIG_COREBOOT)
+ if (CONFIG_COREBOOT || usingXen())
return;
dprintf(3, "enabling shadow ram\n");
- // at this point, statically allocated variables can't be written.
- // so stack should be used.
-
- // Locate chip controlling ram shadowing.
- int bdf = pci_find_init_device(dram_controller_make_writable_tbl, NULL);
- if (bdf < 0) {
- dprintf(1, "Unable to unlock ram - bridge not found\n");
+ // At this point, statically allocated variables can't be written,
+ // so do this search manually.
+ int bdf;
+ foreachbdf(bdf, 0) {
+ u32 vendev = pci_config_readl(bdf, PCI_VENDOR_ID);
+ u16 vendor = vendev & 0xffff, device = vendev >> 16;
+ if (vendor == PCI_VENDOR_ID_INTEL
+ && device == PCI_DEVICE_ID_INTEL_82441) {
+ make_bios_writable_intel(bdf, I440FX_PAM0);
+ return;
+ }
}
+ dprintf(1, "Unable to unlock ram - bridge not found\n");
}
-static const struct pci_device_id dram_controller_make_readonly_tbl[] = {
- PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441,
- i440fx_bios_make_readonly),
- PCI_DEVICE_END
-};
-
// Make the BIOS code segment area (0xf0000) read-only.
void
make_bios_readonly(void)
{
- if (CONFIG_COREBOOT)
+ if (CONFIG_COREBOOT || usingXen())
return;
dprintf(3, "locking shadow ram\n");
- int bdf = pci_find_init_device(dram_controller_make_readonly_tbl, NULL);
- if (bdf < 0) {
+ struct pci_device *pci = pci_find_init_device(
+ dram_controller_make_readonly_tbl, NULL);
+ if (!pci)
dprintf(1, "Unable to lock ram - bridge not found\n");
- }
+}
+
+void
+qemu_prep_reset(void)
+{
+ if (CONFIG_COREBOOT)
+ return;
+ // QEMU doesn't map 0xc0000-0xfffff back to the original rom on a
+ // reset, so do that manually before invoking a hard reset.
+ make_bios_writable();
+ extern u8 code32flat_start[], code32flat_end[];
+ memcpy(code32flat_start, code32flat_start + BIOS_SRC_OFFSET
+ , code32flat_end - code32flat_start);
}