kbuild: full dependency check on asm-offsets.h
[linux-2.6.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 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
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;
74                 cmdline_apic = changed;
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)) { 
96                         genapic = apic_probe[i];
97                         printk(KERN_INFO "Switched to APIC driver `%s'.\n", 
98                                genapic->name);
99                         return 1;
100                 } 
101         } 
102         return 0;
103
104
105 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
106 {
107         int i;
108         for (i = 0; apic_probe[i]; ++i) { 
109                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { 
110                         genapic = apic_probe[i];
111                         printk(KERN_INFO "Switched to APIC driver `%s'.\n", 
112                                genapic->name);
113                         return 1;
114                 } 
115         } 
116         return 0;       
117 }
118
119 int hard_smp_processor_id(void)
120 {
121         return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
122 }