Commit a726c600 authored by John Keller's avatar John Keller Committed by Ingo Molnar
Browse files

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: default avatarJohn Keller <jpk@sgi.com>
Cc: jpk@sgi.com
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6b356022

arch/x86/kernel/acpi/boot.c

+15 −1
Original line number Diff line number Diff line
@@ -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);

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