]> err.no Git - linux-2.6/blob - arch/x86/kernel/genapic_64.c
x86: support for new UV apic, prepare
[linux-2.6] / arch / x86 / kernel / genapic_64.c
1 /*
2  * Copyright 2004 James Cleverdon, IBM.
3  * Subject to the GNU Public License, v.2
4  *
5  * Generic APIC sub-arch probe layer.
6  *
7  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
9  * James Cleverdon.
10  */
11 #include <linux/threads.h>
12 #include <linux/cpumask.h>
13 #include <linux/string.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/ctype.h>
17 #include <linux/init.h>
18
19 #include <asm/smp.h>
20 #include <asm/ipi.h>
21 #include <asm/genapic.h>
22
23 #ifdef CONFIG_ACPI
24 #include <acpi/acpi_bus.h>
25 #endif
26
27 /* which logical CPU number maps to which CPU (physical APIC ID) */
28 #ifdef CONFIG_SMP
29 u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata
30                                         = { [0 ... NR_CPUS-1] = BAD_APICID };
31 void *x86_cpu_to_apicid_early_ptr;
32 #endif
33 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
34 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
35
36 struct genapic __read_mostly *genapic = &apic_flat;
37
38 static enum uv_system_type uv_system_type;
39
40 /*
41  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
42  */
43 void __init setup_apic_routing(void)
44 {
45 #ifdef CONFIG_ACPI
46         /*
47          * Quirk: some x86_64 machines can only use physical APIC mode
48          * regardless of how many processors are present (x86_64 ES7000
49          * is an example).
50          */
51         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
52                         (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
53                 genapic = &apic_physflat;
54         else
55 #endif
56
57         if (cpus_weight(cpu_possible_map) <= 8)
58                 genapic = &apic_flat;
59         else
60                 genapic = &apic_physflat;
61
62         printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
63 }
64
65 /* Same for both flat and physical. */
66
67 void send_IPI_self(int vector)
68 {
69         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
70 }
71
72 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
73 {
74         if (!strcmp(oem_id, "SGI")) {
75                 if (!strcmp(oem_table_id, "UVL"))
76                         uv_system_type = UV_LEGACY_APIC;
77                 else if (!strcmp(oem_table_id, "UVX"))
78                         uv_system_type = UV_X2APIC;
79                 else if (!strcmp(oem_table_id, "UVH"))
80                         uv_system_type = UV_NON_UNIQUE_APIC;
81         }
82         return 0;
83 }
84
85 enum uv_system_type get_uv_system_type(void)
86 {
87         return uv_system_type;
88 }
89
90 int is_uv_system(void)
91 {
92         return uv_system_type != UV_NONE;
93 }