Commit | Line | Data |
---|---|---|
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 | ||
911a62d4 VP |
33 | static int cmdline_apic; |
34 | ||
35 | void __init generic_bigsmp_probe(void) | |
36 | { | |
37 | /* | |
38 | * This routine is used to switch to bigsmp mode when | |
39 | * - There is no apic= option specified by the user | |
40 | * - generic_apic_probe() has choosen apic_default as the sub_arch | |
41 | * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support | |
42 | */ | |
43 | ||
44 | if (!cmdline_apic && genapic == &apic_default) | |
45 | if (apic_bigsmp.probe()) { | |
46 | genapic = &apic_bigsmp; | |
47 | printk(KERN_INFO "Overriding APIC driver with %s\n", | |
48 | genapic->name); | |
49 | } | |
50 | } | |
51 | ||
1da177e4 LT |
52 | void __init generic_apic_probe(char *command_line) |
53 | { | |
54 | char *s; | |
55 | int i; | |
56 | int changed = 0; | |
57 | ||
58 | s = strstr(command_line, "apic="); | |
59 | if (s && (s == command_line || isspace(s[-1]))) { | |
60 | char *p = strchr(s, ' '), old; | |
61 | if (!p) | |
62 | p = strchr(s, '\0'); | |
63 | old = *p; | |
64 | *p = 0; | |
65 | for (i = 0; !changed && apic_probe[i]; i++) { | |
66 | if (!strcmp(apic_probe[i]->name, s+5)) { | |
67 | changed = 1; | |
68 | genapic = apic_probe[i]; | |
69 | } | |
70 | } | |
71 | if (!changed) | |
72 | printk(KERN_ERR "Unknown genapic `%s' specified.\n", s); | |
73 | *p = old; | |
911a62d4 | 74 | cmdline_apic = changed; |
1da177e4 LT |
75 | } |
76 | for (i = 0; !changed && apic_probe[i]; i++) { | |
77 | if (apic_probe[i]->probe()) { | |
78 | changed = 1; | |
79 | genapic = apic_probe[i]; | |
80 | } | |
81 | } | |
82 | /* Not visible without early console */ | |
83 | if (!changed) | |
84 | panic("Didn't find an APIC driver"); | |
85 | ||
86 | printk(KERN_INFO "Using APIC driver %s\n", genapic->name); | |
87 | } | |
88 | ||
89 | /* These functions can switch the APIC even after the initial ->probe() */ | |
90 | ||
91 | int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid) | |
92 | { | |
93 | int i; | |
94 | for (i = 0; apic_probe[i]; ++i) { | |
95 | if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) { | |
2ba567cb JB |
96 | if (!cmdline_apic) { |
97 | genapic = apic_probe[i]; | |
98 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", | |
99 | genapic->name); | |
100 | } | |
1da177e4 LT |
101 | return 1; |
102 | } | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
107 | int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) | |
108 | { | |
109 | int i; | |
110 | for (i = 0; apic_probe[i]; ++i) { | |
111 | if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { | |
2ba567cb JB |
112 | if (!cmdline_apic) { |
113 | genapic = apic_probe[i]; | |
114 | printk(KERN_INFO "Switched to APIC driver `%s'.\n", | |
115 | genapic->name); | |
116 | } | |
1da177e4 LT |
117 | return 1; |
118 | } | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | int hard_smp_processor_id(void) | |
124 | { | |
125 | return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID)); | |
126 | } |