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x86_64: Parsing for ACPI "SAPIC" table

PATCH In review Jack Steiner 1 participant 1 message Mar 28, 2008

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Memory management x86 ACPI
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Jack Steiner

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PATCH 4/8 x86_64: Parsing for ACPI "SAPIC" table

Add kernel support for new ACPI "sapic" tables that contain 16-bit APICIDs. This patch simply adds parsing of an optional SAPIC table if present. Otherwise, the traditional local APIC table is used.

Note: the SAPIC table is not a new ACPI table - it exists on other architectures but is not currently recognized by x86_64.

Based on:

	git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git
Signed-off-by Jack Steiner <[email protected]>
---
 arch/x86/kernel/acpi/boot.c |   26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)
arch/x86/kernel/acpi/boot.c +24 -2
Index: linux/arch/x86/kernel/acpi/boot.c
===================================================================
@@ -283,6 +283,24 @@ acpi_parse_lapic(struct acpi_subtable_he
 }
 
 static int __init
+acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
+{
+	struct acpi_madt_local_sapic *processor = NULL;
+
+	processor = (struct acpi_madt_local_sapic *)header;
+
+	if (BAD_MADT_ENTRY(processor, end))
+		return -EINVAL;
+
+	acpi_table_print_madt_entry(header);
+
+	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
+		processor->lapic_flags & ACPI_MADT_ENABLED);	/* Enabled? */
+
+	return 0;
+}
+
+static int __init
 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 			  const unsigned long end)
 {

@@ -801,8 +819,12 @@ static int __init acpi_parse_madt_lapic_
 
 	mp_register_lapic_address(acpi_lapic_addr);
 
-	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
-				      MAX_APICS);
+	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
+				      acpi_parse_sapic, MAX_APICS);
+
+	if (!count)
+		count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
+					      acpi_parse_lapic, MAX_APICS);
 	if (!count) {
 		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 		/* TBD: Cleanup to allow fallback to MPS */

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