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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. /** Main kernel routine for bootstrap CPU.
  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. /** Main kernel routine for bootstrap CPU using new stack.
  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=%zdK, hardcoded_kdata_size=%zdK\n", sizeof(__address) * 2, config.base, hardcoded_ktext_size / 1024, hardcoded_kdata_size / 1024);
  180.  
  181.     arch_pre_smp_init();
  182.     smp_init();
  183.    
  184.     slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */
  185.  
  186.     printf("config.memory_size=%zdM\n", config.memory_size/(1024*1024));
  187.     printf("config.cpu_count=%zd\n", config.cpu_count);
  188.     cpu_init();
  189.    
  190.     calibrate_delay_loop();
  191.     timeout_init();
  192.     scheduler_init();
  193.     task_init();
  194.     thread_init();
  195.     futex_init();
  196.    
  197.     for (i = 0; i < init.cnt; i++)
  198.         printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, sizeof(__address)*2, init.tasks[i].addr, i, init.tasks[i].size);
  199.    
  200.     ipc_init();
  201.  
  202.     /*
  203.      * Create kernel task.
  204.      */
  205.     k = task_create(AS_KERNEL, "KERNEL");
  206.     if (!k)
  207.         panic("can't create kernel task\n");
  208.    
  209.     /*
  210.      * Create the first thread.
  211.      */
  212.     t = thread_create(kinit, NULL, k, 0, "kinit");
  213.     if (!t)
  214.         panic("can't create kinit thread\n");
  215.     thread_ready(t);
  216.    
  217.     /*
  218.      * This call to scheduler() will return to kinit,
  219.      * starting the thread of kernel threads.
  220.      */
  221.     scheduler();
  222.     /* not reached */
  223. }
  224.  
  225.  
  226. #ifdef CONFIG_SMP
  227. /** Main kernel routine for application CPUs.
  228.  *
  229.  * Executed by application processors, temporary stack
  230.  * is at ctx.sp which was set during BP boot.
  231.  * This function passes control directly to
  232.  * main_ap_separated_stack().
  233.  *
  234.  * Assuming interrupts_disable()'d.
  235.  *
  236.  */
  237. void main_ap(void)
  238. {
  239.     /*
  240.      * Incrementing the active CPU counter will guarantee that the
  241.      * pm_init() will not attempt to build GDT and IDT tables again.
  242.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  243.      * will do.
  244.      */
  245.     config.cpu_active++;
  246.  
  247.     /*
  248.      * The THE structure is well defined because ctx.sp is used as stack.
  249.      */
  250.     the_initialize(THE);
  251.    
  252.     arch_pre_mm_init();
  253.     frame_init();
  254.     page_init();
  255.     tlb_init();
  256.     arch_post_mm_init();
  257.    
  258.     cpu_init();
  259.    
  260.     calibrate_delay_loop();
  261.  
  262.     l_apic_init();
  263.     l_apic_debug();
  264.  
  265.     the_copy(THE, (the_t *) CPU->stack);
  266.  
  267.     /*
  268.      * If we woke kmp up before we left the kernel stack, we could
  269.      * collide with another CPU coming up. To prevent this, we
  270.      * switch to this cpu's private stack prior to waking kmp up.
  271.      */
  272.     context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
  273.     context_restore(&CPU->saved_context);
  274.     /* not reached */
  275. }
  276.  
  277.  
  278. /** Main kernel routine for application CPUs using new stack.
  279.  *
  280.  * Second part of main_ap().
  281.  *
  282.  */
  283. void main_ap_separated_stack(void)
  284. {
  285.     /*
  286.      * Configure timeouts for this cpu.
  287.      */
  288.     timeout_init();
  289.  
  290.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  291.     scheduler();
  292.     /* not reached */
  293. }
  294. #endif /* CONFIG_SMP */
  295.