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From: "Jan Beulich" <jbeulich@novell.com> When using apic= on the kernel command line, this had no effect for machines matched by either the ACPI MADT or the MPS OEM table scan. However, when such option is specified, it should also take effect for this set of systems. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/* Copyright 2003 Andi Kleen, SuSE Labs.
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* Subject to the GNU Public License, v.2
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*
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* Generic x86 APIC driver probe layer.
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*/
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#include <linux/config.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#include <asm/apicdef.h>
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#include <asm/genapic.h>
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extern struct genapic apic_summit;
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extern struct genapic apic_bigsmp;
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extern struct genapic apic_es7000;
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extern struct genapic apic_default;
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struct genapic *genapic = &apic_default;
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struct genapic *apic_probe[] __initdata = {
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&apic_summit,
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&apic_bigsmp,
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&apic_es7000,
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&apic_default, /* must be last */
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NULL,
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};
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static int cmdline_apic;
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void __init generic_bigsmp_probe(void)
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{
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/*
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* This routine is used to switch to bigsmp mode when
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* - There is no apic= option specified by the user
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* - generic_apic_probe() has choosen apic_default as the sub_arch
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* - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
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*/
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if (!cmdline_apic && genapic == &apic_default)
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if (apic_bigsmp.probe()) {
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genapic = &apic_bigsmp;
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printk(KERN_INFO "Overriding APIC driver with %s\n",
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genapic->name);
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}
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}
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void __init generic_apic_probe(char *command_line)
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{
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char *s;
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int i;
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int changed = 0;
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s = strstr(command_line, "apic=");
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if (s && (s == command_line || isspace(s[-1]))) {
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char *p = strchr(s, ' '), old;
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if (!p)
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p = strchr(s, '\0');
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old = *p;
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*p = 0;
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for (i = 0; !changed && apic_probe[i]; i++) {
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if (!strcmp(apic_probe[i]->name, s+5)) {
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changed = 1;
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genapic = apic_probe[i];
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}
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}
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if (!changed)
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printk(KERN_ERR "Unknown genapic `%s' specified.\n", s);
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*p = old;
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cmdline_apic = changed;
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}
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for (i = 0; !changed && apic_probe[i]; i++) {
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if (apic_probe[i]->probe()) {
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changed = 1;
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genapic = apic_probe[i];
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}
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}
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/* Not visible without early console */
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if (!changed)
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panic("Didn't find an APIC driver");
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printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
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}
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/* These functions can switch the APIC even after the initial ->probe() */
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int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid)
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{
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int i;
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for (i = 0; apic_probe[i]; ++i) {
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if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) {
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if (!cmdline_apic) {
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genapic = apic_probe[i];
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printk(KERN_INFO "Switched to APIC driver `%s'.\n",
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genapic->name);
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}
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return 1;
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}
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}
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return 0;
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}
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int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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int i;
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for (i = 0; apic_probe[i]; ++i) {
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if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
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if (!cmdline_apic) {
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genapic = apic_probe[i];
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printk(KERN_INFO "Switched to APIC driver `%s'.\n",
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genapic->name);
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}
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return 1;
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}
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}
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return 0;
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}
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int hard_smp_processor_id(void)
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{
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return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
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}
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