diff options
Diffstat (limited to 'src/northbridge/intel/sandybridge/northbridge.c')
| -rw-r--r-- | src/northbridge/intel/sandybridge/northbridge.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c index fe769f9dc5..1bc812ab29 100644 --- a/src/northbridge/intel/sandybridge/northbridge.c +++ b/src/northbridge/intel/sandybridge/northbridge.c @@ -1,7 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#include <cpu/cpu.h> #include <console/console.h> #include <acpi/acpi.h> +#include <acpi/acpigen.h> #include <commonlib/helpers.h> #include <device/pci_ops.h> #include <delay.h> @@ -82,6 +84,14 @@ static void add_fixed_resources(struct device *dev, int index) } } +static uint64_t get_touud(const struct device *dev) +{ + uint64_t touud = pci_read_config32(dev, TOUUD + 4); + touud <<= 32; + touud |= pci_read_config32(dev, TOUUD); + return touud; +} + static void mc_read_resources(struct device *dev) { uint64_t tom, me_base, touud; @@ -123,9 +133,7 @@ static void mc_read_resources(struct device *dev) */ /* Top of Upper Usable DRAM, including remap */ - touud = pci_read_config32(dev, TOUUD + 4); - touud <<= 32; - touud |= pci_read_config32(dev, TOUUD); + touud = get_touud(dev); /* Top of Lower Usable DRAM */ tolud = pci_read_config32(dev, TOLUD); @@ -372,13 +380,32 @@ void northbridge_write_smram(u8 smram) pci_write_config8(pcidev_on_root(0, 0), SMRAM, smram); } +static void set_above_4g_pci(const struct device *dev) +{ + const uint64_t touud = get_touud(dev); + const uint64_t len = POWER_OF_2(cpu_phys_address_size()) - touud; + + acpigen_write_scope("\\"); + acpigen_write_name_qword("A4GB", touud); + acpigen_write_name_qword("A4GS", len); + acpigen_pop_len(); + + printk(BIOS_DEBUG, "PCI space above 4GB MMIO is at 0x%llx, len = 0x%llx\n", touud, len); +} + +static void mc_gen_ssdt(const struct device *dev) +{ + generate_cpu_entries(dev); + set_above_4g_pci(dev); +} + static struct device_operations mc_ops = { .read_resources = mc_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_dev_enable_resources, .init = northbridge_init, .ops_pci = &pci_dev_ops_pci, - .acpi_fill_ssdt = generate_cpu_entries, + .acpi_fill_ssdt = mc_gen_ssdt, }; static const unsigned short pci_device_ids[] = { |