Messages in this thread Patch in this message | | | Date | Fri, 28 Mar 2008 14:12:09 -0500 | From | Jack Steiner <> | Subject | [PATCH 4/8] x86_64: Parsing for ACPI "SAPIC" table |
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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 <steiner@sgi.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 2008-03-28 12:24:34.000000000 -0500 +++ linux/arch/x86/kernel/acpi/boot.c 2008-03-28 12:41:01.000000000 -0500 @@ -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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