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34 jermar 1
/*
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ia32   
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 * @{
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 */
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/** @file
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 */
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#include <smp/smp.h>
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#include <arch/smp/smp.h>
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#include <arch/smp/mps.h>
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#include <arch/smp/ap.h>
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#include <arch/boot/boot.h>
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#include <genarch/acpi/acpi.h>
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#include <genarch/acpi/madt.h>
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#include <config.h>
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#include <synch/waitq.h>
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#include <synch/synch.h>
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#include <arch/pm.h>
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#include <func.h>
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#include <panic.h>
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#include <debug.h>
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#include <arch/asm.h>
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <mm/slab.h>
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#include <mm/as.h>
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#include <print.h>
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#include <memstr.h>
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#include <arch/drivers/i8259.h>
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#ifdef CONFIG_SMP
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static struct smp_config_operations *ops = NULL;
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void smp_init(void)
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{
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    uintptr_t l_apic_address, io_apic_address;
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    if (acpi_madt) {
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        acpi_madt_parse();
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        ops = &madt_config_operations;
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    }
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    if (config.cpu_count == 1) {
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        mps_init();
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        ops = &mps_config_operations;
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    }
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    l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,
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        FRAME_ATOMIC | FRAME_KA);
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    if (!l_apic_address)
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        panic("cannot allocate address for l_apic\n");
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    io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,
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        FRAME_ATOMIC | FRAME_KA);
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    if (!io_apic_address)
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        panic("cannot allocate address for io_apic\n");
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    if (config.cpu_count > 1) {    
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        page_mapping_insert(AS_KERNEL, l_apic_address,
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            (uintptr_t) l_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
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        page_mapping_insert(AS_KERNEL, io_apic_address,
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            (uintptr_t) io_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
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        l_apic = (uint32_t *) l_apic_address;
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        io_apic = (uint32_t *) io_apic_address;
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    }
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}
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/*
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 * Kernel thread for bringing up application processors. It becomes clear
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 * that we need an arrangement like this (AP's being initialized by a kernel
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 * thread), for a thread has its dedicated stack. (The stack used during the
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 * BSP initialization (prior the very first call to scheduler()) will be used
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 * as an initialization stack for each AP.)
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 */
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void kmp(void *arg __attribute__((unused)))
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{
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    unsigned int i;
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    ASSERT(ops != NULL);
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    /*
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     * We need to access data in frame 0.
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     * We boldly make use of kernel address space mapping.
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     */
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    /*
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     * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
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     */
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    *((uint16_t *) (PA2KA(0x467 + 0))) =
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        (uint16_t) (((uintptr_t) ap_boot) >> 4);    /* segment */
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    *((uint16_t *) (PA2KA(0x467 + 2))) = 0;     /* offset */
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    /*
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     * Save 0xa to address 0xf of the CMOS RAM.
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     * BIOS will not do the POST after the INIT signal.
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     */
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    outb(0x70, 0xf);
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    outb(0x71, 0xa);
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    pic_disable_irqs(0xffff);
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    apic_init();
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    uint8_t apic = l_apic_id();
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    for (i = 0; i < ops->cpu_count(); i++) {
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        struct descriptor *gdt_new;
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        /*
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         * Skip processors marked unusable.
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         */
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        if (!ops->cpu_enabled(i))
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            continue;
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        /*
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         * The bootstrap processor is already up.
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         */
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        if (ops->cpu_bootstrap(i))
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            continue;
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        if (ops->cpu_apic_id(i) == apic) {
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            printf("%s: bad processor entry #%u, will not send IPI "
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                "to myself\n", __FUNCTION__, i);
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            continue;
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        }
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        /*
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         * Prepare new GDT for CPU in question.
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         */
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        gdt_new = (struct descriptor *) malloc(GDT_ITEMS *
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            sizeof(struct descriptor), FRAME_ATOMIC);
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        if (!gdt_new)
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            panic("couldn't allocate memory for GDT\n");
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        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
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        memsetb((uintptr_t)(&gdt_new[TSS_DES]),
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            sizeof(struct descriptor), 0);
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        protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);
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        protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);
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        gdtr.base = (uintptr_t) gdt_new;
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169
        if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
170
            /*
298 decky 171
             * There may be just one AP being initialized at
128 jermar 172
             * the time. After it comes completely up, it is
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             * supposed to wake us up.
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             */
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            if (waitq_sleep_timeout(&ap_completion_wq, 1000000,
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                SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) {
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                unsigned int cpu = (config.cpu_active > i) ?
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                    config.cpu_active : i;
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                printf("%s: waiting for cpu%u (APIC ID = %d) "
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                    "timed out\n", __FUNCTION__, cpu,
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                    ops->cpu_apic_id(i));
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            }
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        } else
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            printf("INIT IPI for l_apic%d failed\n",
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                ops->cpu_apic_id(i));
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    }
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}
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int smp_irq_to_pin(unsigned int irq)
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{
191
    ASSERT(ops != NULL);
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    return ops->irq_to_pin(irq);
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}
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#endif /* CONFIG_SMP */
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1888 jermar 197
/** @}
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 */