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/arch/i386/mach-generic/probe.c

https://bitbucket.org/evzijst/gittest
C | 102 lines | 85 code | 10 blank | 7 comment | 17 complexity | ee7393aa6693c70aa82bc1e778be2135 MD5 | raw file
  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
 18extern struct genapic apic_summit;
 19extern struct genapic apic_bigsmp;
 20extern struct genapic apic_es7000;
 21extern struct genapic apic_default;
 22
 23struct genapic *genapic = &apic_default;
 24
 25struct genapic *apic_probe[] __initdata = { 
 26	&apic_summit,
 27	&apic_bigsmp, 
 28	&apic_es7000,
 29	&apic_default,	/* must be last */
 30	NULL,
 31};
 32
 33void __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
 71int __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
 85int __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
 99int hard_smp_processor_id(void)
100{
101	return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
102}