WebSVN – HelenOS-historic – Blame – /kernel/trunk/arch/ia32/src/smp/smp.c/

Rev	Author	Line No.	Line
34	jermar	1	/*
		2	* Copyright (C) 2005 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	#include <smp/smp.h>
128	jermar	30	#include <arch/smp/smp.h>
		31	#include <arch/smp/mps.h>
		32	#include <arch/smp/ap.h>
34	jermar	33	#include <arch/acpi/acpi.h>
		34	#include <arch/acpi/madt.h>
		35	#include <config.h>
128	jermar	36	#include <synch/waitq.h>
		37	#include <arch/pm.h>
		38	#include <func.h>
		39	#include <panic.h>
		40	#include <debug.h>
		41	#include <arch/asm.h>
		42	#include <mm/frame.h>
		43	#include <mm/page.h>
		44	#include <mm/heap.h>
34	jermar	45
		46	#ifdef __SMP__
		47
128	jermar	48	static struct smp_config_operations *ops = NULL;
		49
34	jermar	50	void smp_init(void)
		51	{
		52	if (acpi_madt) {
		53	acpi_madt_parse();
129	jermar	54	ops = &madt_config_operations;
34	jermar	55	}
128	jermar	56	if (config.cpu_count == 1) {
34	jermar	57	mps_init();
128	jermar	58	ops = &mps_config_operations;
		59	}
131	jermar	60
		61	if (config.cpu_count > 1) {
		62	map_page_to_frame((__address) l_apic, (__address) l_apic, PAGE_NOT_CACHEABLE, 0);
		63	map_page_to_frame((__address) io_apic, (__address) io_apic, PAGE_NOT_CACHEABLE, 0);
		64	}
		65
		66	/*
		67	* Must be initialized outside the kmp thread, since it is waited
		68	* on before the kmp thread is created.
		69	*/
		70	waitq_initialize(&kmp_completion_wq);
		71
34	jermar	72	}
		73
128	jermar	74	/*
		75	* Kernel thread for bringing up application processors. It becomes clear
		76	* that we need an arrangement like this (AP's being initialized by a kernel
		77	* thread), for a thread has its dedicated stack. (The stack used during the
		78	* BSP initialization (prior the very first call to scheduler()) will be used
		79	* as an initialization stack for each AP.)
		80	*/
		81	void kmp(void *arg)
		82	{
		83	__address src, dst;
		84	int i;
34	jermar	85
128	jermar	86	ASSERT(ops != NULL);
		87
		88	waitq_initialize(&ap_completion_wq);
		89
		90	/*
		91	* We need to access data in frame 0.
		92	* We boldly make use of kernel address space mapping.
		93	*/
		94
		95	/*
		96	* Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
		97	*/
		98	((__u16 ) (PA2KA(0x467+0))) = ((__address) ap_boot) >> 4; /* segment */
		99	((__u16 ) (PA2KA(0x467+2))) = 0; /* offset */
		100
		101	/*
		102	* Save 0xa to address 0xf of the CMOS RAM.
		103	* BIOS will not do the POST after the INIT signal.
		104	*/
		105	outb(0x70,0xf);
		106	outb(0x71,0xa);
		107
		108	cpu_priority_high();
		109
		110	pic_disable_irqs(0xffff);
		111	apic_init();
		112
		113	for (i = 0; i < ops->cpu_count(); i++) {
		114	struct descriptor *gdt_new;
		115
		116	/*
		117	* Skip processors marked unusable.
		118	*/
		119	if (!ops->cpu_enabled(i))
		120	continue;
		121
		122	/*
		123	* The bootstrap processor is already up.
		124	*/
		125	if (ops->cpu_bootstrap(i))
		126	continue;
		127
		128	if (ops->cpu_apic_id(i) == l_apic_id()) {
		129	printf("kmp: bad processor entry #%d, will not send IPI to myself\n", i);
		130	continue;
		131	}
		132
		133	/*
		134	* Prepare new GDT for CPU in question.
		135	*/
		136	if (!(gdt_new = (struct descriptor ) malloc(GDT_ITEMSsizeof(struct descriptor))))
		137	panic("couldn't allocate memory for GDT\n");
		138
		139	memcopy(gdt, gdt_new, GDT_ITEMS*sizeof(struct descriptor));
		140	memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
		141	gdtr.base = KA2PA((__address) gdt_new);
		142
		143	if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
		144	/*
		145	* There may be just one AP being initialized at
		146	* the time. After it comes completely up, it is
		147	* supposed to wake us up.
		148	*/
		149	waitq_sleep(&ap_completion_wq);
		150	cpu_priority_high();
		151	}
		152	else {
		153	printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
		154	}
		155	}
		156
		157	/*
		158	* Wakeup the kinit thread so that
		159	* system initialization can go on.
		160	*/
		161	waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);
		162	}
		163
34	jermar	164	#endif /* __SMP__ */

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