source: mainline/kernel/arch/ia32/src/smp/smp.c@ 33dac7d

/*
 * 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_table_lock(AS_KERNEL, true);
                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);
                page_table_unlock(AS_KERNEL, true);
                                  
                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.
         */
        pio_write_8((ioport8_t *)0x70, 0xf);
        pio_write_8((ioport8_t *)0x71, 0xa);

        pic_disable_irqs(0xffff);
        apic_init();
        
        uint8_t apic = l_apic_id();

        for (i = 0; i < ops->cpu_count(); i++) {
                descriptor_t *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.
                 */
                
                /* XXX Flag FRAME_LOW_4_GiB was removed temporarily,
                 * it needs to be replaced by a generic fuctionality of
                 * the memory subsystem
                 */
                gdt_new = (descriptor_t *) malloc(GDT_ITEMS *
                    sizeof(descriptor_t), FRAME_ATOMIC);
                if (!gdt_new)
                        panic("Cannot allocate memory for GDT.");

                memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(descriptor_t));
                memsetb(&gdt_new[TSS_DES], sizeof(descriptor_t), 0);
                protected_ap_gdtr.limit = GDT_ITEMS * sizeof(descriptor_t);
                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 */

/** @}
 */