Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Copyright 2003 Andi Kleen, SuSE Labs. |
| 2 | * Subject to the GNU Public License, v.2 |
| 3 | * |
| 4 | * Generic x86 APIC driver probe layer. |
| 5 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/threads.h> |
| 7 | #include <linux/cpumask.h> |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/ctype.h> |
| 11 | #include <linux/init.h> |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 12 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/fixmap.h> |
| 14 | #include <asm/mpspec.h> |
| 15 | #include <asm/apicdef.h> |
| 16 | #include <asm/genapic.h> |
| 17 | |
| 18 | extern struct genapic apic_summit; |
| 19 | extern struct genapic apic_bigsmp; |
| 20 | extern struct genapic apic_es7000; |
| 21 | extern struct genapic apic_default; |
| 22 | |
| 23 | struct genapic *genapic = &apic_default; |
| 24 | |
| 25 | struct genapic *apic_probe[] __initdata = { |
| 26 | &apic_summit, |
| 27 | &apic_bigsmp, |
| 28 | &apic_es7000, |
| 29 | &apic_default, /* must be last */ |
| 30 | NULL, |
| 31 | }; |
| 32 | |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 33 | static int cmdline_apic __initdata; |
| 34 | static int __init parse_apic(char *arg) |
| 35 | { |
| 36 | int i; |
| 37 | |
| 38 | if (!arg) |
| 39 | return -EINVAL; |
| 40 | |
| 41 | for (i = 0; apic_probe[i]; i++) { |
| 42 | if (!strcmp(apic_probe[i]->name, arg)) { |
| 43 | genapic = apic_probe[i]; |
| 44 | cmdline_apic = 1; |
| 45 | return 0; |
| 46 | } |
| 47 | } |
| 48 | return -ENOENT; |
| 49 | } |
| 50 | early_param("apic", parse_apic); |
Venkatesh Pallipadi | 911a62d | 2005-09-03 15:56:31 -0700 | [diff] [blame] | 51 | |
| 52 | void __init generic_bigsmp_probe(void) |
| 53 | { |
| 54 | /* |
| 55 | * This routine is used to switch to bigsmp mode when |
| 56 | * - There is no apic= option specified by the user |
| 57 | * - generic_apic_probe() has choosen apic_default as the sub_arch |
| 58 | * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support |
| 59 | */ |
| 60 | |
| 61 | if (!cmdline_apic && genapic == &apic_default) |
| 62 | if (apic_bigsmp.probe()) { |
| 63 | genapic = &apic_bigsmp; |
| 64 | printk(KERN_INFO "Overriding APIC driver with %s\n", |
| 65 | genapic->name); |
| 66 | } |
| 67 | } |
| 68 | |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 69 | void __init generic_apic_probe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 71 | if (!cmdline_apic) { |
| 72 | int i; |
| 73 | for (i = 0; apic_probe[i]; i++) { |
| 74 | if (apic_probe[i]->probe()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | genapic = apic_probe[i]; |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 76 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | } |
Rusty Russell | 1a3f239 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 79 | /* Not visible without early console */ |
| 80 | if (!apic_probe[i]) |
| 81 | panic("Didn't find an APIC driver"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | printk(KERN_INFO "Using APIC driver %s\n", genapic->name); |
| 84 | } |
| 85 | |
| 86 | /* These functions can switch the APIC even after the initial ->probe() */ |
| 87 | |
| 88 | int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid) |
| 89 | { |
| 90 | int i; |
| 91 | for (i = 0; apic_probe[i]; ++i) { |
| 92 | if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) { |
Jan Beulich | 2ba567c | 2006-05-30 22:47:51 +0200 | [diff] [blame] | 93 | if (!cmdline_apic) { |
| 94 | genapic = apic_probe[i]; |
| 95 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", |
| 96 | genapic->name); |
| 97 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return 1; |
| 99 | } |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
| 105 | { |
| 106 | int i; |
| 107 | for (i = 0; apic_probe[i]; ++i) { |
| 108 | if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { |
Jan Beulich | 2ba567c | 2006-05-30 22:47:51 +0200 | [diff] [blame] | 109 | if (!cmdline_apic) { |
| 110 | genapic = apic_probe[i]; |
| 111 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", |
| 112 | genapic->name); |
| 113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return 1; |
| 115 | } |
| 116 | } |
| 117 | return 0; |
| 118 | } |
| 119 | |
Andi Kleen | 874c4fe | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 120 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | int hard_smp_processor_id(void) |
| 122 | { |
| 123 | return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID)); |
| 124 | } |
Andi Kleen | 874c4fe | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 125 | #endif |