x86: allow MMCONFIG above 4GB on x86_64

SGI UV will have MMCFG base addresses that are greater than 4GB (32 bits).

v2: Use CONFIG_RESOURCES_64BIT instead of CONFIG_X86_64.
v3: Create a flag, that is set by platform specific code,
    to disable the > 4GB check.

Signed-off-by: John Keller <jpk@sgi.com>
Cc: jpk@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 15 insertions, 1 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index fa88a1d7129..bfd10fd211c 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -97,6 +97,8 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
 #warning ACPI uses CMPXCHG, i486 and later hardware
 #endif
 
+static int acpi_mcfg_64bit_base_addr __initdata = FALSE;
+
 /* --------------------------------------------------------------------------
                               Boot-time Configuration
    -------------------------------------------------------------------------- */
@@ -158,6 +160,14 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
 struct acpi_mcfg_allocation *pci_mmcfg_config;
 int pci_mmcfg_config_num;
 
+static int __init acpi_mcfg_oem_check(struct acpi_table_mcfg *mcfg)
+{
+        if (!strcmp(mcfg->header.oem_id, "SGI"))
+                acpi_mcfg_64bit_base_addr = TRUE;
+
+        return 0;
+}
+
 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 {
         struct acpi_table_mcfg *mcfg;
@@ -190,8 +200,12 @@ int __init acpi_parse_mcfg(struct acpi_table_header *header)
         }
 
         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
+
+        acpi_mcfg_oem_check(mcfg);
+
         for (i = 0; i < pci_mmcfg_config_num; ++i) {
-                if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
+                if ((pci_mmcfg_config[i].address > 0xFFFFFFFF) &&
+                    !acpi_mcfg_64bit_base_addr) {
                         printk(KERN_ERR PREFIX
                                "MMCONFIG not in low 4GB of memory\n");
                         kfree(pci_mmcfg_config);