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* Copyright (c) 2008 Jakub Jermar
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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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* - 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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* 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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#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 <synch/waitq.h>
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#include <synch/synch.h>
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#include <arch/drivers/i8259.h>
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static struct smp_config_operations *ops = NULL;
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uintptr_t l_apic_address, io_apic_address;
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ops = &madt_config_operations;
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if (config.cpu_count == 1) {
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ops = &mps_config_operations;
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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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panic("Cannot allocate address for l_apic.");
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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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panic("Cannot allocate address for io_apic.");
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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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* 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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void kmp(void *arg __attribute__((unused)))
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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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* Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
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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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* 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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pio_write_8((ioport8_t *)0x70, 0xf);
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pio_write_8((ioport8_t *)0x71, 0xa);
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pic_disable_irqs(0xffff);
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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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descriptor_t *gdt_new;
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* Skip processors marked unusable.
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if (!ops->cpu_enabled(i))
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* The bootstrap processor is already up.
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if (ops->cpu_bootstrap(i))
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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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* Prepare new GDT for CPU in question.
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/* XXX Flag FRAME_LOW_4_GiB was removed temporarily,
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* it needs to be replaced by a generic fuctionality of
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* the memory subsystem
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gdt_new = (descriptor_t *) malloc(GDT_ITEMS *
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sizeof(descriptor_t), FRAME_ATOMIC);
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panic("Cannot allocate memory for GDT.");
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memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(descriptor_t));
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memsetb(&gdt_new[TSS_DES], sizeof(descriptor_t), 0);
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protected_ap_gdtr.limit = GDT_ITEMS * sizeof(descriptor_t);
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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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if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
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* There may be just one AP being initialized at
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* the time. After it comes completely up, it is
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* supposed to wake us up.
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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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printf("INIT IPI for l_apic%d failed\n",
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ops->cpu_apic_id(i));
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int smp_irq_to_pin(unsigned int irq)
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return ops->irq_to_pin(irq);
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#endif /* CONFIG_SMP */