diff options
| -rw-r--r-- | src/northbridge/intel/sandybridge/acpi.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/src/northbridge/intel/sandybridge/acpi.c b/src/northbridge/intel/sandybridge/acpi.c index c7914a0a45..48be666367 100644 --- a/src/northbridge/intel/sandybridge/acpi.c +++ b/src/northbridge/intel/sandybridge/acpi.c @@ -17,6 +17,7 @@ #include <types.h> #include <console/console.h> +#include <commonlib/helpers.h> #include <arch/acpi.h> #include <device/device.h> #include <device/pci.h> @@ -66,16 +67,42 @@ unsigned long acpi_fill_mcfg(unsigned long current) return current; } +static unsigned long acpi_create_igfx_rmrr(const unsigned long current) +{ + const u32 base_mask = ~(u32)(MiB - 1); + + struct device *const host = dev_find_slot(0, PCI_DEVFN(0, 0)); + if (!host) + return 0; + + const u32 bgsm = pci_read_config32(host, BGSM) & base_mask; + const u32 tolud = pci_read_config32(host, TOLUD) & base_mask; + if (!bgsm || !tolud) + return 0; + + return acpi_create_dmar_rmrr(current, 0, bgsm, tolud - 1); +} + static unsigned long acpi_fill_dmar(unsigned long current) { const struct device *const igfx = pcidev_on_root(2, 0); if (igfx && igfx->enabled) { - const unsigned long tmp = current; + unsigned long tmp; + + tmp = current; current += acpi_create_dmar_drhd(current, 0, 0, IOMMU_BASE1); current += acpi_create_dmar_ds_pci(current, 0, 2, 0); current += acpi_create_dmar_ds_pci(current, 0, 2, 1); acpi_dmar_drhd_fixup(tmp, current); + + tmp = current; + current += acpi_create_igfx_rmrr(current); + if (current != tmp) { + current += acpi_create_dmar_ds_pci(current, 0, 2, 0); + current += acpi_create_dmar_ds_pci(current, 0, 2, 1); + acpi_dmar_rmrr_fixup(tmp, current); + } } const unsigned long tmp = current; |