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x86: add functions to determine if platform is a UV platform 

Add functions that can be used to determine if an x86_64
system is a SGI "UV" system. UV systems come in 3 types and
are identified by the OEM ID in the MADT.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jack Steiner 2008-03-28 14:12:06 -05:00 committed by Ingo Molnar
parent 05f2d12c35
commit ae26186865
4 changed files with 36 additions and 3 deletions
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4
arch/x86/kernel/acpi/boot.c
View File

@ -56,9 +56,7 @@ EXPORT_SYMBOL(acpi_disabled);
#ifdef CONFIG_X86_64
#include <asm/proto.h>
static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
#include <asm/genapic.h>
#else /* X86 */

25
arch/x86/kernel/genapic_64.c
View File

@ -33,6 +33,8 @@ EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
struct genapic __read_mostly *genapic = &apic_flat;
static enum uv_system_type uv_system_type;
/*
* Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
*/
@ -64,3 +66,26 @@ void send_IPI_self(int vector)
{
__send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
}
int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
if (!strcmp(oem_id, "SGI")) {
if (!strcmp(oem_table_id, "UVL"))
uv_system_type = UV_LEGACY_APIC;
else if (!strcmp(oem_table_id, "UVX"))
uv_system_type = UV_X2APIC;
else if (!strcmp(oem_table_id, "UVH"))
uv_system_type = UV_NON_UNIQUE_APIC;
}
return 0;
}
enum uv_system_type get_uv_system_type(void)
{
return uv_system_type;
}
int is_uv_system(void)
{
return uv_system_type != UV_NONE;
}

5
include/asm-x86/genapic_32.h
View File

@ -114,4 +114,9 @@ struct genapic {
extern struct genapic *genapic;
enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
#define get_uv_system_type() UV_NONE
#define is_uv_system() 0
#endif

5
include/asm-x86/genapic_64.h
View File

@ -33,5 +33,10 @@ extern struct genapic *genapic;
extern struct genapic apic_flat;
extern struct genapic apic_physflat;
extern int acpi_madt_oem_check(char *, char *);
enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
extern enum uv_system_type get_uv_system_type(void);
extern int is_uv_system(void);
#endif