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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /**
  30.  * @file    main.c
  31.  * @brief   Main initialization kernel function for all processors.
  32.  *
  33.  * During kernel boot, all processors, after architecture dependent
  34.  * initialization, start executing code found in this file. After
  35.  * bringing up all subsystems, control is passed to scheduler().
  36.  *
  37.  * The bootstrap processor starts executing main_bsp() while
  38.  * the application processors start executing main_ap().
  39.  *
  40.  * @see scheduler()
  41.  * @see main_bsp()
  42.  * @see main_ap()
  43.  */
  44.  
  45. #include <arch/asm.h>
  46. #include <context.h>
  47. #include <print.h>
  48. #include <panic.h>
  49. #include <debug.h>
  50. #include <config.h>
  51. #include <time/clock.h>
  52. #include <proc/scheduler.h>
  53. #include <proc/thread.h>
  54. #include <proc/task.h>
  55. #include <main/kinit.h>
  56. #include <main/version.h>
  57. #include <console/kconsole.h>
  58. #include <cpu.h>
  59. #include <align.h>
  60. #include <interrupt.h>
  61. #include <arch/mm/memory_init.h>
  62. #include <mm/frame.h>
  63. #include <mm/page.h>
  64. #include <genarch/mm/page_pt.h>
  65. #include <mm/tlb.h>
  66. #include <mm/as.h>
  67. #include <mm/slab.h>
  68. #include <synch/waitq.h>
  69. #include <synch/futex.h>
  70. #include <arch/arch.h>
  71. #include <arch.h>
  72. #include <arch/faddr.h>
  73. #include <typedefs.h>
  74. #include <ipc/ipc.h>
  75. #include <macros.h>
  76. #include <adt/btree.h>
  77.  
  78. #ifdef CONFIG_SMP
  79. #include <arch/smp/apic.h>
  80. #include <arch/smp/mps.h>
  81. #endif /* CONFIG_SMP */
  82. #include <smp/smp.h>
  83.  
  84. config_t config;    /**< Global configuration structure. */
  85. init_t init = {0};      /**< Initial user-space tasks */
  86.  
  87. context_t ctx;
  88.  
  89. /**
  90.  * These 'hardcoded' variables will be intialized by
  91.  * the linker or the low level assembler code with
  92.  * appropriate sizes and addresses.
  93.  */
  94. __address hardcoded_load_address = 0;
  95. size_t hardcoded_ktext_size = 0;
  96. size_t hardcoded_kdata_size = 0;
  97.  
  98. void main_bsp(void);
  99. void main_ap(void);
  100.  
  101. /*
  102.  * These two functions prevent stack from underflowing during the
  103.  * kernel boot phase when SP is set to the very top of the reserved
  104.  * space. The stack could get corrupted by a fooled compiler-generated
  105.  * pop sequence otherwise.
  106.  */
  107. static void main_bsp_separated_stack(void);
  108. #ifdef CONFIG_SMP
  109. static void main_ap_separated_stack(void);
  110. #endif
  111.  
  112. #define CONFIG_STACK_SIZE   ((1<<STACK_FRAMES)*STACK_SIZE)
  113.  
  114. /** Main kernel routine for bootstrap CPU.
  115.  *
  116.  * Initializes the kernel by bootstrap CPU.
  117.  * This function passes control directly to
  118.  * main_bsp_separated_stack().
  119.  *
  120.  * Assuming interrupts_disable().
  121.  *
  122.  */
  123. void main_bsp(void)
  124. {
  125.     __address stackaddr;
  126.  
  127.     config.cpu_count = 1;
  128.     config.cpu_active = 1;
  129.    
  130.     config.base = hardcoded_load_address;
  131.     config.memory_size = get_memory_size();
  132.    
  133.     config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
  134.     stackaddr = config.base + config.kernel_size;
  135.    
  136.     /* Avoid placing kernel on top of init */
  137.     count_t i;
  138.     bool overlap = false;
  139.     for (i = 0; i < init.cnt; i++)
  140.         if (PA_overlaps(stackaddr, CONFIG_STACK_SIZE, init.tasks[i].addr, init.tasks[i].size)) {
  141.             stackaddr = ALIGN_UP(init.tasks[i].addr + init.tasks[i].size, CONFIG_STACK_SIZE);
  142.             init.tasks[i].size = ALIGN_UP(init.tasks[i].size, CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
  143.             overlap = true;
  144.         }
  145.    
  146.     if (!overlap)
  147.         config.kernel_size += CONFIG_STACK_SIZE;
  148.    
  149.     context_save(&ctx);
  150.     context_set(&ctx, FADDR(main_bsp_separated_stack), stackaddr, THREAD_STACK_SIZE);
  151.     context_restore(&ctx);
  152.     /* not reached */
  153. }
  154.  
  155.  
  156. /** Main kernel routine for bootstrap CPU using new stack.
  157.  *
  158.  * Second part of main_bsp().
  159.  *
  160.  */
  161. void main_bsp_separated_stack(void)
  162. {
  163.     task_t *k;
  164.     thread_t *t;
  165.     count_t i;
  166.    
  167.     the_initialize(THE);
  168.  
  169.     /*
  170.      * kconsole data structures must be initialized very early
  171.      * because other subsystems will register their respective
  172.      * commands.
  173.      */
  174.     kconsole_init();
  175.    
  176.     /*
  177.      * Exception handler initialization, before architecture
  178.      * starts adding its own handlers
  179.      */
  180.     exc_init();
  181.  
  182.     /*
  183.      * Memory management subsystems initialization.
  184.      */
  185.     arch_pre_mm_init();
  186.     frame_init();       /* Initialize at least 1 memory segment big enough for slab to work */
  187.     slab_cache_init();
  188.     btree_init();
  189.     as_init();
  190.     page_init();
  191.     tlb_init();
  192.     arch_post_mm_init();   
  193.  
  194.     version_print();
  195.     printf("%.*p: hardcoded_ktext_size=%zdK, hardcoded_kdata_size=%zdK\n", sizeof(__address) * 2, config.base, hardcoded_ktext_size / 1024, hardcoded_kdata_size / 1024);
  196.  
  197.     arch_pre_smp_init();
  198.     smp_init();
  199.    
  200.     slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */
  201.  
  202.     printf("config.memory_size=%zdM\n", config.memory_size/(1024*1024));
  203.     printf("config.cpu_count=%zd\n", config.cpu_count);
  204.     cpu_init();
  205.    
  206.     calibrate_delay_loop();
  207.     timeout_init();
  208.     scheduler_init();
  209.     task_init();
  210.     thread_init();
  211.     futex_init();
  212.    
  213.     for (i = 0; i < init.cnt; i++)
  214.         printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, sizeof(__address)*2, init.tasks[i].addr, i, init.tasks[i].size);
  215.    
  216.     ipc_init();
  217.  
  218.     /*
  219.      * Create kernel task.
  220.      */
  221.     k = task_create(AS_KERNEL, "KERNEL");
  222.     if (!k)
  223.         panic("can't create kernel task\n");
  224.    
  225.     /*
  226.      * Create the first thread.
  227.      */
  228.     t = thread_create(kinit, NULL, k, 0, "kinit");
  229.     if (!t)
  230.         panic("can't create kinit thread\n");
  231.     thread_ready(t);
  232.    
  233.     /*
  234.      * This call to scheduler() will return to kinit,
  235.      * starting the thread of kernel threads.
  236.      */
  237.     scheduler();
  238.     /* not reached */
  239. }
  240.  
  241.  
  242. #ifdef CONFIG_SMP
  243. /** Main kernel routine for application CPUs.
  244.  *
  245.  * Executed by application processors, temporary stack
  246.  * is at ctx.sp which was set during BP boot.
  247.  * This function passes control directly to
  248.  * main_ap_separated_stack().
  249.  *
  250.  * Assuming interrupts_disable()'d.
  251.  *
  252.  */
  253. void main_ap(void)
  254. {
  255.     /*
  256.      * Incrementing the active CPU counter will guarantee that the
  257.      * pm_init() will not attempt to build GDT and IDT tables again.
  258.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  259.      * will do.
  260.      */
  261.     config.cpu_active++;
  262.  
  263.     /*
  264.      * The THE structure is well defined because ctx.sp is used as stack.
  265.      */
  266.     the_initialize(THE);
  267.    
  268.     arch_pre_mm_init();
  269.     frame_init();
  270.     page_init();
  271.     tlb_init();
  272.     arch_post_mm_init();
  273.    
  274.     cpu_init();
  275.    
  276.     calibrate_delay_loop();
  277.  
  278.     l_apic_init();
  279.     l_apic_debug();
  280.  
  281.     the_copy(THE, (the_t *) CPU->stack);
  282.  
  283.     /*
  284.      * If we woke kmp up before we left the kernel stack, we could
  285.      * collide with another CPU coming up. To prevent this, we
  286.      * switch to this cpu's private stack prior to waking kmp up.
  287.      */
  288.     context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
  289.     context_restore(&CPU->saved_context);
  290.     /* not reached */
  291. }
  292.  
  293.  
  294. /** Main kernel routine for application CPUs using new stack.
  295.  *
  296.  * Second part of main_ap().
  297.  *
  298.  */
  299. void main_ap_separated_stack(void)
  300. {
  301.     /*
  302.      * Configure timeouts for this cpu.
  303.      */
  304.     timeout_init();
  305.  
  306.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  307.     scheduler();
  308.     /* not reached */
  309. }
  310. #endif /* CONFIG_SMP */
  311.