| 1 | /*
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| 2 | * Copyright (C) 2001-2004 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 <arch/asm.h>
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| 30 | #include <context.h>
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| 31 | #include <print.h>
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| 32 | #include <panic.h>
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| 33 | #include <debug.h>
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| 34 | #include <config.h>
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| 35 | #include <time/clock.h>
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| 36 | #include <proc/scheduler.h>
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| 37 | #include <proc/thread.h>
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| 38 | #include <proc/task.h>
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| 39 | #include <main/kinit.h>
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| 40 | #include <main/version.h>
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| 41 | #include <console/kconsole.h>
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| 42 | #include <cpu.h>
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| 43 | #include <align.h>
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| 44 | #include <interrupt.h>
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| 45 | #include <arch/mm/memory_init.h>
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| 46 | #include <mm/frame.h>
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| 47 | #include <mm/page.h>
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| 48 | #include <genarch/mm/page_pt.h>
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| 49 | #include <mm/tlb.h>
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| 50 | #include <mm/as.h>
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| 51 | #include <mm/slab.h>
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| 52 | #include <synch/waitq.h>
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| 53 | #include <arch/arch.h>
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| 54 | #include <arch.h>
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| 55 | #include <arch/faddr.h>
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| 56 | #include <typedefs.h>
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| 57 | #include <ipc/ipc.h>
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| 58 |
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| 59 | #ifdef CONFIG_SMP
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| 60 | #include <arch/smp/apic.h>
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| 61 | #include <arch/smp/mps.h>
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| 62 | #endif /* CONFIG_SMP */
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| 63 | #include <smp/smp.h>
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| 64 |
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| 65 | config_t config; /**< Global configuration structure. */
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| 66 |
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| 67 | context_t ctx;
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| 68 |
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| 69 | /**
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| 70 | * These 'hardcoded' variables will be intialized by
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| 71 | * the linker or the low level assembler code with
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| 72 | * appropriate sizes and addresses.
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| 73 | */
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| 74 | __address hardcoded_load_address = 0;
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| 75 | size_t hardcoded_ktext_size = 0;
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| 76 | size_t hardcoded_kdata_size = 0;
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| 77 |
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| 78 | __address init_addr = 0;
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| 79 | size_t init_size = 0;
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| 80 |
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| 81 | void main_bsp(void);
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| 82 | void main_ap(void);
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| 83 |
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| 84 | /*
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| 85 | * These two functions prevent stack from underflowing during the
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| 86 | * kernel boot phase when SP is set to the very top of the reserved
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| 87 | * space. The stack could get corrupted by a fooled compiler-generated
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| 88 | * pop sequence otherwise.
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| 89 | */
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| 90 | static void main_bsp_separated_stack(void);
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| 91 | #ifdef CONFIG_SMP
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| 92 | static void main_ap_separated_stack(void);
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| 93 | #endif
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| 94 |
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| 95 | /** Bootstrap CPU main kernel routine
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| 96 | *
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| 97 | * Initializes the kernel by bootstrap CPU.
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| 98 | * This function passes control directly to
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| 99 | * main_bsp_separated_stack().
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| 100 | *
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| 101 | * Assuming interrupts_disable().
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| 102 | *
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| 103 | */
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| 104 | void main_bsp(void)
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| 105 | {
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| 106 | __address stackaddr;
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| 107 |
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| 108 | config.cpu_count = 1;
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| 109 | config.cpu_active = 1;
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| 110 |
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| 111 | config.base = hardcoded_load_address;
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| 112 | config.memory_size = get_memory_size();
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| 113 | config.init_addr = init_addr;
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| 114 | config.init_size = init_size;
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| 115 |
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| 116 | config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
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| 117 | stackaddr = config.base + config.kernel_size;
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| 118 | /* Avoid placing kernel on top of init */
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| 119 | if (overlaps(stackaddr,CONFIG_STACK_SIZE,
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| 120 | config.init_addr, config.init_size)) {
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| 121 |
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| 122 | stackaddr = ALIGN_UP(config.init_addr+config.init_size,
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| 123 | CONFIG_STACK_SIZE);
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| 124 | config.init_size = ALIGN_UP(config.init_size,CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
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| 125 | } else {
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| 126 | config.kernel_size += CONFIG_STACK_SIZE;
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| 127 | }
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| 128 |
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| 129 | context_save(&ctx);
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| 130 | context_set(&ctx, FADDR(main_bsp_separated_stack),
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| 131 | stackaddr, CONFIG_STACK_SIZE);
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| 132 | context_restore(&ctx);
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| 133 | /* not reached */
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| 134 | }
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| 135 |
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| 136 |
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| 137 | /** Bootstrap CPU main kernel routine stack wrapper
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| 138 | *
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| 139 | * Second part of main_bsp().
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| 140 | *
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| 141 | */
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| 142 | void main_bsp_separated_stack(void)
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| 143 | {
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| 144 | task_t *k;
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| 145 | thread_t *t;
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| 146 |
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| 147 | the_initialize(THE);
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| 148 | /*
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| 149 | * kconsole data structures must be initialized very early
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| 150 | * because other subsystems will register their respective
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| 151 | * commands.
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| 152 | */
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| 153 | kconsole_init();
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| 154 |
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| 155 | /*
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| 156 | * Exception handler initialization, before architecture
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| 157 | * starts adding its own handlers
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| 158 | */
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| 159 | exc_init();
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| 160 |
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| 161 | /*
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| 162 | * Memory management subsystems initialization.
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| 163 | */
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| 164 | arch_pre_mm_init();
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| 165 | /* Initialize at least 1 memory segment big enough for slab to work */
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| 166 | frame_init();
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| 167 | slab_cache_init();
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| 168 | as_init();
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| 169 | page_init();
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| 170 | tlb_init();
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| 171 | arch_post_mm_init();
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| 172 | version_print();
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| 173 |
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| 174 | printf("%P: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
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| 175 | config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
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| 176 |
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| 177 | arch_pre_smp_init();
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| 178 | smp_init();
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| 179 | /* Slab must be initialized AFTER we know the number of processors */
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| 180 | slab_enable_cpucache();
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| 181 |
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| 182 | printf("config.memory_size=%dM\n", config.memory_size/(1024*1024));
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| 183 | printf("config.cpu_count=%d\n", config.cpu_count);
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| 184 | cpu_init();
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| 185 |
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| 186 | calibrate_delay_loop();
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| 187 | timeout_init();
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| 188 | scheduler_init();
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| 189 | task_init();
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| 190 | thread_init();
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| 191 |
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| 192 | if (config.init_size > 0)
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| 193 | printf("config.init_addr=%P, config.init_size=%d\n", config.init_addr, config.init_size);
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| 194 |
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| 195 | ipc_init();
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| 196 | /*
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| 197 | * Create kernel task.
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| 198 | */
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| 199 | k = task_create(AS_KERNEL);
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| 200 | if (!k)
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| 201 | panic("can't create kernel task\n");
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| 202 |
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| 203 | /*
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| 204 | * Create the first thread.
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| 205 | */
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| 206 | t = thread_create(kinit, NULL, k, 0);
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| 207 | if (!t)
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| 208 | panic("can't create kinit thread\n");
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| 209 | thread_ready(t);
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| 210 |
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| 211 | /*
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| 212 | * This call to scheduler() will return to kinit,
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| 213 | * starting the thread of kernel threads.
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| 214 | */
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| 215 | scheduler();
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| 216 | /* not reached */
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| 217 | }
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| 218 |
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| 219 |
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| 220 | #ifdef CONFIG_SMP
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| 221 | /** Application CPUs main kernel routine
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| 222 | *
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| 223 | * Executed by application processors, temporary stack
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| 224 | * is at ctx.sp which was set during BP boot.
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| 225 | * This function passes control directly to
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| 226 | * main_ap_separated_stack().
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| 227 | *
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| 228 | * Assuming interrupts_disable()'d.
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| 229 | *
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| 230 | */
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| 231 | void main_ap(void)
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| 232 | {
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| 233 | /*
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| 234 | * Incrementing the active CPU counter will guarantee that the
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| 235 | * pm_init() will not attempt to build GDT and IDT tables again.
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| 236 | * Neither frame_init() will do the complete thing. Neither cpu_init()
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| 237 | * will do.
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| 238 | */
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| 239 | config.cpu_active++;
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| 240 |
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| 241 | /*
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| 242 | * The THE structure is well defined because ctx.sp is used as stack.
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| 243 | */
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| 244 | the_initialize(THE);
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| 245 |
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| 246 | arch_pre_mm_init();
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| 247 | frame_init();
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| 248 | page_init();
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| 249 | tlb_init();
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| 250 | arch_post_mm_init();
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| 251 |
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| 252 | cpu_init();
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| 253 |
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| 254 | calibrate_delay_loop();
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| 255 |
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| 256 | l_apic_init();
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| 257 | l_apic_debug();
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| 258 |
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| 259 | the_copy(THE, (the_t *) CPU->stack);
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| 260 |
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| 261 | /*
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| 262 | * If we woke kmp up before we left the kernel stack, we could
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| 263 | * collide with another CPU coming up. To prevent this, we
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| 264 | * switch to this cpu's private stack prior to waking kmp up.
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| 265 | */
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| 266 | context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
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| 267 | context_restore(&CPU->saved_context);
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| 268 | /* not reached */
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| 269 | }
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| 270 |
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| 271 |
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| 272 | /** Application CPUs main kernel routine stack wrapper
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| 273 | *
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| 274 | * Second part of main_ap().
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| 275 | *
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| 276 | */
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| 277 | void main_ap_separated_stack(void)
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| 278 | {
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| 279 | /*
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| 280 | * Configure timeouts for this cpu.
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| 281 | */
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| 282 | timeout_init();
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| 283 |
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| 284 | waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
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| 285 | scheduler();
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| 286 | /* not reached */
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| 287 | }
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| 288 | #endif /* CONFIG_SMP */
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