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1809 | decky | 1 | /* |
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 | |||
29 | /** @addtogroup xen32 |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #include <smp/smp.h> |
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36 | #include <arch/smp/smp.h> |
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37 | #include <arch/smp/mps.h> |
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38 | #include <arch/smp/ap.h> |
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39 | #include <arch/boot/boot.h> |
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40 | #include <genarch/acpi/acpi.h> |
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41 | #include <genarch/acpi/madt.h> |
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42 | #include <config.h> |
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43 | #include <synch/waitq.h> |
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44 | #include <synch/synch.h> |
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45 | #include <arch/pm.h> |
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46 | #include <func.h> |
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47 | #include <panic.h> |
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48 | #include <debug.h> |
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49 | #include <arch/asm.h> |
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50 | #include <mm/frame.h> |
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51 | #include <mm/page.h> |
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52 | #include <mm/slab.h> |
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53 | #include <mm/as.h> |
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54 | #include <print.h> |
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55 | #include <memstr.h> |
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56 | #include <arch/drivers/i8259.h> |
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57 | |||
58 | #ifdef CONFIG_SMP |
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59 | |||
60 | static struct smp_config_operations *ops = NULL; |
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61 | |||
62 | void smp_init(void) |
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63 | { |
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64 | uintptr_t l_apic_address, io_apic_address; |
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65 | |||
66 | if (acpi_madt) { |
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67 | acpi_madt_parse(); |
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68 | ops = &madt_config_operations; |
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69 | } |
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70 | if (config.cpu_count == 1) { |
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71 | mps_init(); |
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72 | ops = &mps_config_operations; |
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73 | } |
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74 | |||
75 | l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA); |
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76 | if (!l_apic_address) |
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77 | panic("cannot allocate address for l_apic\n"); |
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78 | |||
79 | io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA); |
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80 | if (!io_apic_address) |
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81 | panic("cannot allocate address for io_apic\n"); |
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82 | |||
83 | if (config.cpu_count > 1) { |
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84 | page_mapping_insert(AS_KERNEL, l_apic_address, (uintptr_t) l_apic, |
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85 | PAGE_NOT_CACHEABLE); |
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86 | page_mapping_insert(AS_KERNEL, io_apic_address, (uintptr_t) io_apic, |
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87 | PAGE_NOT_CACHEABLE); |
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88 | |||
89 | l_apic = (uint32_t *) l_apic_address; |
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90 | io_apic = (uint32_t *) io_apic_address; |
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91 | } |
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92 | } |
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93 | |||
94 | /* |
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95 | * Kernel thread for bringing up application processors. It becomes clear |
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96 | * that we need an arrangement like this (AP's being initialized by a kernel |
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97 | * thread), for a thread has its dedicated stack. (The stack used during the |
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98 | * BSP initialization (prior the very first call to scheduler()) will be used |
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99 | * as an initialization stack for each AP.) |
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100 | */ |
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101 | void kmp(void *arg) |
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102 | { |
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103 | int i; |
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104 | |||
105 | ASSERT(ops != NULL); |
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106 | |||
107 | waitq_initialize(&ap_completion_wq); |
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108 | |||
109 | /* |
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110 | * We need to access data in frame 0. |
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111 | * We boldly make use of kernel address space mapping. |
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112 | */ |
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113 | |||
114 | /* |
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115 | * Save 0xa to address 0xf of the CMOS RAM. |
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116 | * BIOS will not do the POST after the INIT signal. |
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117 | */ |
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118 | outb(0x70,0xf); |
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119 | outb(0x71,0xa); |
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120 | |||
121 | pic_disable_irqs(0xffff); |
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122 | apic_init(); |
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123 | |||
124 | for (i = 0; i < ops->cpu_count(); i++) { |
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125 | struct descriptor *gdt_new; |
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126 | |||
127 | /* |
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128 | * Skip processors marked unusable. |
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129 | */ |
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130 | if (!ops->cpu_enabled(i)) |
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131 | continue; |
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132 | |||
133 | /* |
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134 | * The bootstrap processor is already up. |
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135 | */ |
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136 | if (ops->cpu_bootstrap(i)) |
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137 | continue; |
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138 | |||
139 | if (ops->cpu_apic_id(i) == l_apic_id()) { |
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140 | printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i); |
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141 | continue; |
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142 | } |
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143 | |||
144 | /* |
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145 | * Prepare new GDT for CPU in question. |
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146 | */ |
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147 | if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor), FRAME_ATOMIC))) |
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148 | panic("couldn't allocate memory for GDT\n"); |
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149 | |||
150 | memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor)); |
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151 | memsetb((uintptr_t)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0); |
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152 | gdtr.base = (uintptr_t) gdt_new; |
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153 | |||
154 | if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) { |
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155 | /* |
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156 | * There may be just one AP being initialized at |
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157 | * the time. After it comes completely up, it is |
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158 | * supposed to wake us up. |
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159 | */ |
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160 | if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) |
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161 | 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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162 | } else |
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163 | printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i)); |
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164 | } |
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165 | } |
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166 | |||
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 | |||
173 | #endif /* CONFIG_SMP */ |
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174 | |||
175 | /** @} |
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176 | */ |