Linux-2.6.12-rc2
[linux-3.10.git] / arch / i386 / mach-generic / probe.c
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 }