/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup ia32
* @{
*/
/** @file
*/
#include <smp/smp.h>
#include <arch/smp/smp.h>
#include <arch/smp/mps.h>
#include <arch/smp/ap.h>
#include <arch/boot/boot.h>
#include <genarch/acpi/acpi.h>
#include <genarch/acpi/madt.h>
#include <config.h>
#include <synch/waitq.h>
#include <synch/synch.h>
#include <arch/pm.h>
#include <func.h>
#include <panic.h>
#include <debug.h>
#include <arch/asm.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <mm/slab.h>
#include <mm/as.h>
#include <print.h>
#include <memstr.h>
#include <arch/drivers/i8259.h>
#ifdef CONFIG_SMP
static struct smp_config_operations *ops = NULL;
void smp_init(void)
{
uintptr_t l_apic_address, io_apic_address;
if (acpi_madt) {
acpi_madt_parse();
ops = &madt_config_operations;
}
if (config.cpu_count == 1) {
mps_init();
ops = &mps_config_operations;
}
l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,
FRAME_ATOMIC | FRAME_KA);
if (!l_apic_address)
panic("Cannot allocate address for l_apic.");
io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,
FRAME_ATOMIC | FRAME_KA);
if (!io_apic_address)
panic("Cannot allocate address for io_apic.");
if (config.cpu_count > 1) {
page_mapping_insert(AS_KERNEL, l_apic_address,
(uintptr_t) l_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
page_mapping_insert(AS_KERNEL, io_apic_address,
(uintptr_t) io_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
l_apic = (uint32_t *) l_apic_address;
io_apic = (uint32_t *) io_apic_address;
}
}
/*
* Kernel thread for bringing up application processors. It becomes clear
* that we need an arrangement like this (AP's being initialized by a kernel
* thread), for a thread has its dedicated stack. (The stack used during the
* BSP initialization (prior the very first call to scheduler()) will be used
* as an initialization stack for each AP.)
*/
void kmp(void *arg __attribute__((unused)))
{
unsigned int i;
ASSERT(ops != NULL);
/*
* We need to access data in frame 0.
* We boldly make use of kernel address space mapping.
*/
/*
* Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
*/
*((uint16_t *) (PA2KA(0x467 + 0))) =
(uint16_t) (((uintptr_t) ap_boot) >> 4); /* segment */
*((uint16_t *) (PA2KA(0x467 + 2))) = 0; /* offset */
/*
* Save 0xa to address 0xf of the CMOS RAM.
* BIOS will not do the POST after the INIT signal.
*/
outb(0x70, 0xf);
outb(0x71, 0xa);
pic_disable_irqs(0xffff);
apic_init();
uint8_t apic = l_apic_id();
for (i = 0; i < ops->cpu_count(); i++) {
struct descriptor *gdt_new;
/*
* Skip processors marked unusable.
*/
if (!ops->cpu_enabled(i))
continue;
/*
* The bootstrap processor is already up.
*/
if (ops->cpu_bootstrap(i))
continue;
if (ops->cpu_apic_id(i) == apic) {
printf("%s: bad processor entry #%u, will not send IPI " "to myself\n", __FUNCTION__, i);
continue;
}
/*
* Prepare new GDT for CPU in question.
*/
gdt_new
= (struct descriptor
*) malloc(GDT_ITEMS
* sizeof(struct descriptor), FRAME_ATOMIC | FRAME_LOW_4_GiB);
if (!gdt_new)
panic("Cannot allocate memory for GDT.");
memcpy(gdt_new
, gdt
, GDT_ITEMS
* sizeof(struct descriptor
)); memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);
protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);
gdtr.base = (uintptr_t) gdt_new;
if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
/*
* There may be just one AP being initialized at
* the time. After it comes completely up, it is
* supposed to wake us up.
*/
if (waitq_sleep_timeout(&ap_completion_wq, 1000000,
SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) {
unsigned int cpu = (config.cpu_active > i) ?
config.cpu_active : i;
printf("%s: waiting for cpu%u (APIC ID = %d) " "timed out\n", __FUNCTION__, cpu,
ops->cpu_apic_id(i));
}
} else
printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
}
}
int smp_irq_to_pin(unsigned int irq)
{
ASSERT(ops != NULL);
return ops->irq_to_pin(irq);
}
#endif /* CONFIG_SMP */
/** @}
*/