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