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1da177e4 LT |
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 | } |