| 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 | */ |
| 6 | #include <linux/config.h> |
| 7 | #include <linux/threads.h> |
| 8 | #include <linux/cpumask.h> |
| 9 | #include <linux/string.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/ctype.h> |
| 12 | #include <linux/init.h> |
| 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 | |
| 33 | void __init generic_apic_probe(char *command_line) |
| 34 | { |
| 35 | char *s; |
| 36 | int i; |
| 37 | int changed = 0; |
| 38 | |
| 39 | s = strstr(command_line, "apic="); |
| 40 | if (s && (s == command_line || isspace(s[-1]))) { |
| 41 | char *p = strchr(s, ' '), old; |
| 42 | if (!p) |
| 43 | p = strchr(s, '\0'); |
| 44 | old = *p; |
| 45 | *p = 0; |
| 46 | for (i = 0; !changed && apic_probe[i]; i++) { |
| 47 | if (!strcmp(apic_probe[i]->name, s+5)) { |
| 48 | changed = 1; |
| 49 | genapic = apic_probe[i]; |
| 50 | } |
| 51 | } |
| 52 | if (!changed) |
| 53 | printk(KERN_ERR "Unknown genapic `%s' specified.\n", s); |
| 54 | *p = old; |
| 55 | } |
| 56 | for (i = 0; !changed && apic_probe[i]; i++) { |
| 57 | if (apic_probe[i]->probe()) { |
| 58 | changed = 1; |
| 59 | genapic = apic_probe[i]; |
| 60 | } |
| 61 | } |
| 62 | /* Not visible without early console */ |
| 63 | if (!changed) |
| 64 | panic("Didn't find an APIC driver"); |
| 65 | |
| 66 | printk(KERN_INFO "Using APIC driver %s\n", genapic->name); |
| 67 | } |
| 68 | |
| 69 | /* These functions can switch the APIC even after the initial ->probe() */ |
| 70 | |
| 71 | int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid) |
| 72 | { |
| 73 | int i; |
| 74 | for (i = 0; apic_probe[i]; ++i) { |
| 75 | if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) { |
| 76 | genapic = apic_probe[i]; |
| 77 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", |
| 78 | genapic->name); |
| 79 | return 1; |
| 80 | } |
| 81 | } |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
| 86 | { |
| 87 | int i; |
| 88 | for (i = 0; apic_probe[i]; ++i) { |
| 89 | if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { |
| 90 | genapic = apic_probe[i]; |
| 91 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", |
| 92 | genapic->name); |
| 93 | return 1; |
| 94 | } |
| 95 | } |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | int hard_smp_processor_id(void) |
| 100 | { |
| 101 | return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID)); |
| 102 | } |