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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. #include <arch/asm.h>
  30. #include <context.h>
  31. #include <print.h>
  32. #include <panic.h>
  33. #include <debug.h>
  34. #include <config.h>
  35. #include <time/clock.h>
  36. #include <proc/scheduler.h>
  37. #include <proc/thread.h>
  38. #include <proc/task.h>
  39. #include <main/kinit.h>
  40. #include <main/version.h>
  41. #include <console/kconsole.h>
  42. #include <cpu.h>
  43. #include <align.h>
  44. #include <interrupt.h>
  45. #include <arch/mm/memory_init.h>
  46. #include <mm/frame.h>
  47. #include <mm/page.h>
  48. #include <genarch/mm/page_pt.h>
  49. #include <mm/tlb.h>
  50. #include <mm/as.h>
  51. #include <mm/slab.h>
  52. #include <synch/waitq.h>
  53. #include <synch/futex.h>
  54. #include <arch/arch.h>
  55. #include <arch.h>
  56. #include <arch/faddr.h>
  57. #include <typedefs.h>
  58. #include <ipc/ipc.h>
  59. #include <macros.h>
  60. #include <adt/btree.h>
  61.  
  62. #ifdef CONFIG_SMP
  63. #include <arch/smp/apic.h>
  64. #include <arch/smp/mps.h>
  65. #endif /* CONFIG_SMP */
  66. #include <smp/smp.h>
  67.  
  68. config_t config;    /**< Global configuration structure. */
  69. init_t init = {0};      /**< Initial user-space tasks */
  70.  
  71. context_t ctx;
  72.  
  73. /**
  74.  * These 'hardcoded' variables will be intialized by
  75.  * the linker or the low level assembler code with
  76.  * appropriate sizes and addresses.
  77.  */
  78. __address hardcoded_load_address = 0;
  79. size_t hardcoded_ktext_size = 0;
  80. size_t hardcoded_kdata_size = 0;
  81.  
  82. void main_bsp(void);
  83. void main_ap(void);
  84.  
  85. /*
  86.  * These two functions prevent stack from underflowing during the
  87.  * kernel boot phase when SP is set to the very top of the reserved
  88.  * space. The stack could get corrupted by a fooled compiler-generated
  89.  * pop sequence otherwise.
  90.  */
  91. static void main_bsp_separated_stack(void);
  92. #ifdef CONFIG_SMP
  93. static void main_ap_separated_stack(void);
  94. #endif
  95.  
  96. #define CONFIG_STACK_SIZE   ((1<<STACK_FRAMES)*STACK_SIZE)
  97.  
  98. /** Bootstrap CPU main kernel routine
  99.  *
  100.  * Initializes the kernel by bootstrap CPU.
  101.  * This function passes control directly to
  102.  * main_bsp_separated_stack().
  103.  *
  104.  * Assuming interrupts_disable().
  105.  *
  106.  */
  107. void main_bsp(void)
  108. {
  109.     __address stackaddr;
  110.  
  111.     config.cpu_count = 1;
  112.     config.cpu_active = 1;
  113.    
  114.     config.base = hardcoded_load_address;
  115.     config.memory_size = get_memory_size();
  116.    
  117.     config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
  118.     stackaddr = config.base + config.kernel_size;
  119.    
  120.     /* Avoid placing kernel on top of init */
  121.     count_t i;
  122.     bool overlap = false;
  123.     for (i = 0; i < init.cnt; i++)
  124.         if (PA_overlaps(stackaddr, CONFIG_STACK_SIZE, init.tasks[i].addr, init.tasks[i].size)) {
  125.             stackaddr = ALIGN_UP(init.tasks[i].addr + init.tasks[i].size, CONFIG_STACK_SIZE);
  126.             init.tasks[i].size = ALIGN_UP(init.tasks[i].size, CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
  127.             overlap = true;
  128.         }
  129.    
  130.     if (!overlap)
  131.         config.kernel_size += CONFIG_STACK_SIZE;
  132.    
  133.     context_save(&ctx);
  134.     context_set(&ctx, FADDR(main_bsp_separated_stack), stackaddr, THREAD_STACK_SIZE);
  135.     context_restore(&ctx);
  136.     /* not reached */
  137. }
  138.  
  139.  
  140. /** Bootstrap CPU main kernel routine stack wrapper
  141.  *
  142.  * Second part of main_bsp().
  143.  *
  144.  */
  145. void main_bsp_separated_stack(void)
  146. {
  147.     task_t *k;
  148.     thread_t *t;
  149.     count_t i;
  150.    
  151.     the_initialize(THE);
  152.  
  153.     /*
  154.      * kconsole data structures must be initialized very early
  155.      * because other subsystems will register their respective
  156.      * commands.
  157.      */
  158.     kconsole_init();
  159.    
  160.     /*
  161.      * Exception handler initialization, before architecture
  162.      * starts adding its own handlers
  163.      */
  164.     exc_init();
  165.  
  166.     /*
  167.      * Memory management subsystems initialization.
  168.      */
  169.     arch_pre_mm_init();
  170.     frame_init();       /* Initialize at least 1 memory segment big enough for slab to work */
  171.     slab_cache_init();
  172.     btree_init();
  173.     as_init();
  174.     page_init();
  175.     tlb_init();
  176.     arch_post_mm_init();   
  177.  
  178.     version_print();
  179.     printf("%P: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
  180.         config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
  181.  
  182.     arch_pre_smp_init();
  183.     smp_init();
  184.    
  185.     slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */
  186.  
  187.     printf("config.memory_size=%dM\n", config.memory_size/(1024*1024));
  188.     printf("config.cpu_count=%d\n", config.cpu_count);
  189.     cpu_init();
  190.    
  191.     calibrate_delay_loop();
  192.     timeout_init();
  193.     scheduler_init();
  194.     task_init();
  195.     thread_init();
  196.     futex_init();
  197.    
  198.     for (i = 0; i < init.cnt; i++)
  199.         printf("init[%d].addr=%P, init[%d].size=%d\n", i, init.tasks[i].addr, i, init.tasks[i].size);
  200.    
  201.     ipc_init();
  202.  
  203.     /*
  204.      * Create kernel task.
  205.      */
  206.     k = task_create(AS_KERNEL, "KERNEL");
  207.     if (!k)
  208.         panic("can't create kernel task\n");
  209.    
  210.     /*
  211.      * Create the first thread.
  212.      */
  213.     t = thread_create(kinit, NULL, k, 0, "kinit");
  214.     if (!t)
  215.         panic("can't create kinit thread\n");
  216.     thread_ready(t);
  217.    
  218.     /*
  219.      * This call to scheduler() will return to kinit,
  220.      * starting the thread of kernel threads.
  221.      */
  222.     scheduler();
  223.     /* not reached */
  224. }
  225.  
  226.  
  227. #ifdef CONFIG_SMP
  228. /** Application CPUs main kernel routine
  229.  *
  230.  * Executed by application processors, temporary stack
  231.  * is at ctx.sp which was set during BP boot.
  232.  * This function passes control directly to
  233.  * main_ap_separated_stack().
  234.  *
  235.  * Assuming interrupts_disable()'d.
  236.  *
  237.  */
  238. void main_ap(void)
  239. {
  240.     /*
  241.      * Incrementing the active CPU counter will guarantee that the
  242.      * pm_init() will not attempt to build GDT and IDT tables again.
  243.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  244.      * will do.
  245.      */
  246.     config.cpu_active++;
  247.  
  248.     /*
  249.      * The THE structure is well defined because ctx.sp is used as stack.
  250.      */
  251.     the_initialize(THE);
  252.    
  253.     arch_pre_mm_init();
  254.     frame_init();
  255.     page_init();
  256.     tlb_init();
  257.     arch_post_mm_init();
  258.    
  259.     cpu_init();
  260.    
  261.     calibrate_delay_loop();
  262.  
  263.     l_apic_init();
  264.     l_apic_debug();
  265.  
  266.     the_copy(THE, (the_t *) CPU->stack);
  267.  
  268.     /*
  269.      * If we woke kmp up before we left the kernel stack, we could
  270.      * collide with another CPU coming up. To prevent this, we
  271.      * switch to this cpu's private stack prior to waking kmp up.
  272.      */
  273.     context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
  274.     context_restore(&CPU->saved_context);
  275.     /* not reached */
  276. }
  277.  
  278.  
  279. /** Application CPUs main kernel routine stack wrapper
  280.  *
  281.  * Second part of main_ap().
  282.  *
  283.  */
  284. void main_ap_separated_stack(void)
  285. {
  286.     /*
  287.      * Configure timeouts for this cpu.
  288.      */
  289.     timeout_init();
  290.  
  291.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  292.     scheduler();
  293.     /* not reached */
  294. }
  295. #endif /* CONFIG_SMP */
  296.