2 * Copyright 2003 Andi Kleen, SuSE Labs.
3 * Subject to the GNU Public License, v.2
5 * Generic x86 APIC driver probe layer.
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 <linux/errno.h>
14 #include <asm/fixmap.h>
15 #include <asm/mpspec.h>
16 #include <asm/apicdef.h>
17 #include <asm/genapic.h>
18 #include <asm/setup.h>
20 extern struct genapic apic_numaq
;
21 extern struct genapic apic_summit
;
22 extern struct genapic apic_bigsmp
;
23 extern struct genapic apic_es7000
;
24 extern struct genapic apic_default
;
26 struct genapic
*apic
= &apic_default
;
28 static struct genapic
*apic_probe
[] __initdata
= {
29 #ifdef CONFIG_X86_NUMAQ
32 #ifdef CONFIG_X86_SUMMIT
35 #ifdef CONFIG_X86_BIGSMP
38 #ifdef CONFIG_X86_ES7000
41 &apic_default
, /* must be last */
45 static int cmdline_apic __initdata
;
46 static int __init
parse_apic(char *arg
)
53 for (i
= 0; apic_probe
[i
]; i
++) {
54 if (!strcmp(apic_probe
[i
]->name
, arg
)) {
61 if (x86_quirks
->update_genapic
)
62 x86_quirks
->update_genapic();
64 /* Parsed again by __setup for debug/verbose */
67 early_param("apic", parse_apic
);
69 void __init
generic_bigsmp_probe(void)
71 #ifdef CONFIG_X86_BIGSMP
73 * This routine is used to switch to bigsmp mode when
74 * - There is no apic= option specified by the user
75 * - generic_apic_probe() has chosen apic_default as the sub_arch
76 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
79 if (!cmdline_apic
&& apic
== &apic_default
) {
80 if (apic_bigsmp
.probe()) {
82 if (x86_quirks
->update_genapic
)
83 x86_quirks
->update_genapic();
84 printk(KERN_INFO
"Overriding APIC driver with %s\n",
91 void __init
generic_apic_probe(void)
95 for (i
= 0; apic_probe
[i
]; i
++) {
96 if (apic_probe
[i
]->probe()) {
101 /* Not visible without early console */
103 panic("Didn't find an APIC driver");
105 if (x86_quirks
->update_genapic
)
106 x86_quirks
->update_genapic();
108 printk(KERN_INFO
"Using APIC driver %s\n", apic
->name
);
111 /* These functions can switch the APIC even after the initial ->probe() */
114 generic_mps_oem_check(struct mpc_table
*mpc
, char *oem
, char *productid
)
118 for (i
= 0; apic_probe
[i
]; ++i
) {
119 if (!apic_probe
[i
]->mps_oem_check
)
121 if (!apic_probe
[i
]->mps_oem_check(mpc
, oem
, productid
))
125 apic
= apic_probe
[i
];
126 if (x86_quirks
->update_genapic
)
127 x86_quirks
->update_genapic();
128 printk(KERN_INFO
"Switched to APIC driver `%s'.\n",
136 int __init
default_acpi_madt_oem_check(char *oem_id
, char *oem_table_id
)
140 for (i
= 0; apic_probe
[i
]; ++i
) {
141 if (!apic_probe
[i
]->acpi_madt_oem_check
)
143 if (!apic_probe
[i
]->acpi_madt_oem_check(oem_id
, oem_table_id
))
147 apic
= apic_probe
[i
];
148 if (x86_quirks
->update_genapic
)
149 x86_quirks
->update_genapic();
150 printk(KERN_INFO
"Switched to APIC driver `%s'.\n",
158 int hard_smp_processor_id(void)
160 return apic
->get_apic_id(*(unsigned long *)(APIC_BASE
+APIC_ID
));