linux-kernel - [RFC 4/8] x86_64: Parsing for ACPI "SAPIC" table

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Message-ID: <20080324182114.GA28060@sgi.com>
Date:	Mon, 24 Mar 2008 13:21:14 -0500
From:	Jack Steiner <steiner@....com>
To:	mingo@...e.hu, tglx@...utronix.de
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [RFC 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.


	Signed-off-by: Jack Steiner <steiner@....com>


---
 arch/x86/kernel/acpi/boot.c |   26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

Index: linux/arch/x86/kernel/acpi/boot.c
===================================================================
--- linux.orig/arch/x86/kernel/acpi/boot.c	2008-03-21 15:37:05.000000000 -0500
+++ linux/arch/x86/kernel/acpi/boot.c	2008-03-21 15:40:46.000000000 -0500
@@ -261,6 +261,24 @@ 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);
+
+	mp_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)
 {
@@ -753,8 +771,12 @@ 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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