This patch adds support for MCFG table, which allows OS to find the

MMCONFIG for memory mapped PCIe config.

However this patch is not enough to enable it on Linux, Linux do not trust
BIOSes too much, so a small patch to kernel to disable the check if this
region is e820 reserved.

PCI: BIOS Bug: MCFG area at e0000000 is not E820-reserved
PCI: Not using MMCONFIG.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2936 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 34 insertions, 0 deletions

diff --git a/src/arch/i386/boot/acpi.c b/src/arch/i386/boot/acpi.c
index e1734d80e7..b437e85229 100644
--- a/src/arch/i386/boot/acpi.c
+++ b/src/arch/i386/boot/acpi.c
@@ -65,6 +65,15 @@ void acpi_add_table(acpi_rsdt_t *rsdt, void *table)
 	printk_warning("ACPI: could not add ACPI table to RSDT. failed.\n");
 }
 
+int acpi_create_mcfg_mmconfig(acpi_mcfg_mmconfig_t *mmconfig, u32 base, u16 seg_nr, u8 start, u8 end) {
+	mmconfig->base_address = base;
+	mmconfig->base_reserved = 0;
+	mmconfig->pci_segment_group_number = seg_nr;
+	mmconfig->start_bus_number = start;
+	mmconfig->end_bus_number = end;
+	return (sizeof(acpi_mcfg_mmconfig_t));
+}
+
 
 int acpi_create_madt_lapic(acpi_madt_lapic_t *lapic, u8 cpu, u8 apic)
 {
@@ -146,6 +155,31 @@ void acpi_create_madt(acpi_madt_t *madt)
 	header->checksum	= acpi_checksum((void *)madt, header->length);
 }
 
+void acpi_create_mcfg(acpi_mcfg_t *mcfg)
+{
+
+	acpi_header_t *header=&(mcfg->header);
+	unsigned long current=(unsigned long)mcfg+sizeof(acpi_mcfg_t);
+	
+	memset((void *)mcfg, 0, sizeof(acpi_mcfg_t));
+	
+	/* fill out header fields */
+	memcpy(header->signature, MCFG_NAME, 4);
+	memcpy(header->oem_id, OEM_ID, 6);
+	memcpy(header->oem_table_id, MCFG_TABLE, 8);
+	memcpy(header->asl_compiler_id, ASLC, 4);
+	
+	header->length = sizeof(acpi_mcfg_t);
+	header->revision = 1;
+
+	current = acpi_fill_mcfg(current);
+	
+	/* recalculate length */
+	header->length= current - (unsigned long)mcfg;
+	
+	header->checksum	= acpi_checksum((void *)mcfg, header->length);
+}
+
 int acpi_create_srat_lapic(acpi_srat_lapic_t *lapic, u8 node, u8 apic)
 {
         lapic->type=0;