| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include <smp/smp.h>
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| 30 | #include <arch/smp/smp.h>
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| 31 | #include <arch/smp/mps.h>
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| 32 | #include <arch/smp/ap.h>
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| 33 | #include <genarch/acpi/acpi.h>
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| 34 | #include <genarch/acpi/madt.h>
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| 35 | #include <config.h>
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| 36 | #include <synch/waitq.h>
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| 37 | #include <synch/synch.h>
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| 38 | #include <arch/pm.h>
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| 39 | #include <func.h>
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| 40 | #include <panic.h>
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| 41 | #include <debug.h>
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| 42 | #include <arch/asm.h>
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| 43 | #include <mm/frame.h>
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| 44 | #include <mm/page.h>
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| 45 | #include <mm/heap.h>
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| 46 | #include <print.h>
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| 47 | #include <memstr.h>
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| 48 | #include <arch/i8259.h>
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| 49 |
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| 50 | #ifdef CONFIG_SMP
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| 51 |
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| 52 | static struct smp_config_operations *ops = NULL;
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| 53 |
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| 54 | void smp_init(void)
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| 55 | {
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| 56 | if (acpi_madt) {
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| 57 | acpi_madt_parse();
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| 58 | ops = &madt_config_operations;
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| 59 | }
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| 60 | if (config.cpu_count == 1) {
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| 61 | mps_init();
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| 62 | ops = &mps_config_operations;
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| 63 | }
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| 64 |
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| 65 | if (config.cpu_count > 1) {
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| 66 | page_mapping_insert((__address)l_apic, (__address)l_apic,
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| 67 | PAGE_NOT_CACHEABLE, 0);
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| 68 | page_mapping_insert((__address) io_apic,
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| 69 | (__address) io_apic,
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| 70 | PAGE_NOT_CACHEABLE, 0);
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| 71 | }
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| 72 |
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| 73 | /*
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| 74 | * Must be initialized outside the kmp thread, since it is waited
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| 75 | * on before the kmp thread is created.
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| 76 | */
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| 77 | waitq_initialize(&kmp_completion_wq);
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| 78 |
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| 79 | }
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| 80 |
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| 81 | /*
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| 82 | * Kernel thread for bringing up application processors. It becomes clear
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| 83 | * that we need an arrangement like this (AP's being initialized by a kernel
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| 84 | * thread), for a thread has its dedicated stack. (The stack used during the
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| 85 | * BSP initialization (prior the very first call to scheduler()) will be used
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| 86 | * as an initialization stack for each AP.)
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| 87 | */
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| 88 | void kmp(void *arg)
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| 89 | {
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| 90 | int i;
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| 91 |
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| 92 | ASSERT(ops != NULL);
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| 93 |
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| 94 | waitq_initialize(&ap_completion_wq);
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| 95 |
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| 96 | /*
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| 97 | * We need to access data in frame 0.
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| 98 | * We boldly make use of kernel address space mapping.
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| 99 | */
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| 100 |
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| 101 | /*
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| 102 | * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
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| 103 | */
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| 104 | *((__u16 *) (PA2KA(0x467+0))) = ((__address) ap_boot) >> 4; /* segment */
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| 105 | *((__u16 *) (PA2KA(0x467+2))) = 0; /* offset */
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| 106 |
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| 107 | /*
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| 108 | * Save 0xa to address 0xf of the CMOS RAM.
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| 109 | * BIOS will not do the POST after the INIT signal.
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| 110 | */
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| 111 | outb(0x70,0xf);
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| 112 | outb(0x71,0xa);
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| 113 |
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| 114 | pic_disable_irqs(0xffff);
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| 115 | apic_init();
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| 116 |
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| 117 | for (i = 0; i < ops->cpu_count(); i++) {
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| 118 | struct descriptor *gdt_new;
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| 119 |
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| 120 | /*
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| 121 | * Skip processors marked unusable.
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| 122 | */
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| 123 | if (!ops->cpu_enabled(i))
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| 124 | continue;
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| 125 |
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| 126 | /*
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| 127 | * The bootstrap processor is already up.
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| 128 | */
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| 129 | if (ops->cpu_bootstrap(i))
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| 130 | continue;
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| 131 |
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| 132 | if (ops->cpu_apic_id(i) == l_apic_id()) {
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| 133 | printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i);
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| 134 | continue;
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| 135 | }
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| 136 |
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| 137 | /*
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| 138 | * Prepare new GDT for CPU in question.
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| 139 | */
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| 140 | if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor))))
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| 141 | panic("couldn't allocate memory for GDT\n");
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| 142 |
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| 143 | memcpy(gdt_new, gdt, GDT_ITEMS*sizeof(struct descriptor));
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| 144 | memsetb((__address)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
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| 145 | real_bootstrap_gdtr.base = KA2PA((__address) gdt_new);
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| 146 | gdtr.base = (__address) gdt_new;
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| 147 |
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| 148 | if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
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| 149 | /*
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| 150 | * There may be just one AP being initialized at
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| 151 | * the time. After it comes completely up, it is
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| 152 | * supposed to wake us up.
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| 153 | */
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| 154 | if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_BLOCKING) == ESYNCH_TIMEOUT)
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| 155 | printf("%s: waiting for cpu%d (APIC ID = %d) timed out\n", __FUNCTION__, config.cpu_active > i ? config.cpu_active : i, ops->cpu_apic_id(i));
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| 156 | } else
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| 157 | printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
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| 158 | }
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| 159 |
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| 160 | /*
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| 161 | * Wakeup the kinit thread so that
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| 162 | * system initialization can go on.
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| 163 | */
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| 164 | waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);
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| 165 | }
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| 166 |
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| 167 | int smp_irq_to_pin(int irq)
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| 168 | {
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| 169 | ASSERT(ops != NULL);
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| 170 | return ops->irq_to_pin(irq);
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| 171 | }
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| 172 |
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| 173 | #endif /* CONFIG_SMP */
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