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