WebSVN – HelenOS – Blame – /trunk/kernel/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>
195	vana	45	#include <print.h>
		46	#include <memstr.h>
		47	#include <arch/i8259.h>
34	jermar	48
		49	#ifdef __SMP__
		50
128	jermar	51	static struct smp_config_operations *ops = NULL;
		52
34	jermar	53	void smp_init(void)
		54	{
		55	if (acpi_madt) {
		56	acpi_madt_parse();
129	jermar	57	ops = &madt_config_operations;
34	jermar	58	}
128	jermar	59	if (config.cpu_count == 1) {
34	jermar	60	mps_init();
128	jermar	61	ops = &mps_config_operations;
		62	}
131	jermar	63
277	palkovsky	64	if (config.cpu_count > 1) {
		65	map_page_to_frame((__address)l_apic, (__address)l_apic,
273	palkovsky	66	PAGE_NOT_CACHEABLE, 0);
277	palkovsky	67	map_page_to_frame((__address) io_apic,
		68	(__address) io_apic,
273	palkovsky	69	PAGE_NOT_CACHEABLE, 0);
131	jermar	70	}
		71
		72	/*
		73	* Must be initialized outside the kmp thread, since it is waited
		74	* on before the kmp thread is created.
		75	*/
		76	waitq_initialize(&kmp_completion_wq);
		77
34	jermar	78	}
		79
128	jermar	80	/*
		81	* Kernel thread for bringing up application processors. It becomes clear
		82	* that we need an arrangement like this (AP's being initialized by a kernel
		83	* thread), for a thread has its dedicated stack. (The stack used during the
		84	* BSP initialization (prior the very first call to scheduler()) will be used
		85	* as an initialization stack for each AP.)
		86	*/
		87	void kmp(void *arg)
		88	{
		89	__address src, dst;
		90	int i;
269	decky	91
128	jermar	92	ASSERT(ops != NULL);
		93
		94	waitq_initialize(&ap_completion_wq);
		95
		96	/*
		97	* We need to access data in frame 0.
		98	* We boldly make use of kernel address space mapping.
		99	*/
		100
		101	/*
		102	* Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
		103	*/
		104	((__u16 ) (PA2KA(0x467+0))) = ((__address) ap_boot) >> 4; /* segment */
		105	((__u16 ) (PA2KA(0x467+2))) = 0; /* offset */
		106
		107	/*
		108	* Save 0xa to address 0xf of the CMOS RAM.
		109	* BIOS will not do the POST after the INIT signal.
		110	*/
		111	outb(0x70,0xf);
		112	outb(0x71,0xa);
		113
		114	cpu_priority_high();
		115
		116	pic_disable_irqs(0xffff);
		117	apic_init();
		118
		119	for (i = 0; i < ops->cpu_count(); i++) {
		120	struct descriptor *gdt_new;
		121
		122	/*
		123	* Skip processors marked unusable.
		124	*/
		125	if (!ops->cpu_enabled(i))
		126	continue;
		127
		128	/*
		129	* The bootstrap processor is already up.
		130	*/
		131	if (ops->cpu_bootstrap(i))
		132	continue;
		133
		134	if (ops->cpu_apic_id(i) == l_apic_id()) {
		135	printf("kmp: bad processor entry #%d, will not send IPI to myself\n", i);
		136	continue;
		137	}
		138
		139	/*
		140	* Prepare new GDT for CPU in question.
		141	*/
		142	if (!(gdt_new = (struct descriptor ) malloc(GDT_ITEMSsizeof(struct descriptor))))
		143	panic("couldn't allocate memory for GDT\n");
		144
205	jermar	145	memcpy(gdt_new, gdt, GDT_ITEMS*sizeof(struct descriptor));
195	vana	146	memsetb((__address)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
279	decky	147	real_bootstrap_gdtr.base = KA2PA((__address) gdt_new);
269	decky	148	gdtr.base = (__address) gdt_new;
128	jermar	149
		150	if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
		151	/*
		152	* There may be just one AP being initialized at
		153	* the time. After it comes completely up, it is
		154	* supposed to wake us up.
		155	*/
		156	waitq_sleep(&ap_completion_wq);
		157	}
		158	else {
		159	printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
		160	}
		161	}
		162
		163	/*
		164	* Wakeup the kinit thread so that
		165	* system initialization can go on.
		166	*/
		167	waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);
		168	}
		169
34	jermar	170	#endif /* __SMP__ */

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