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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.  
  58. #ifdef CONFIG_SMP
  59. #include <arch/smp/apic.h>
  60. #include <arch/smp/mps.h>
  61. #endif /* CONFIG_SMP */
  62. #include <smp/smp.h>
  63.  
  64. config_t config;    /**< Global configuration structure. */
  65.  
  66. context_t ctx;
  67.  
  68. /**
  69.  * These 'hardcoded' variables will be intialized by
  70.  * the linker or the low level assembler code with
  71.  * appropriate sizes and addresses.
  72.  */
  73. __address hardcoded_load_address = 0;
  74. size_t hardcoded_ktext_size = 0;
  75. size_t hardcoded_kdata_size = 0;
  76.  
  77. __address init_addr = 0;
  78. size_t init_size = 0;
  79.  
  80. void main_bsp(void);
  81. void main_ap(void);
  82.  
  83. /*
  84.  * These two functions prevent stack from underflowing during the
  85.  * kernel boot phase when SP is set to the very top of the reserved
  86.  * space. The stack could get corrupted by a fooled compiler-generated
  87.  * pop sequence otherwise.
  88.  */
  89. static void main_bsp_separated_stack(void);
  90. #ifdef CONFIG_SMP
  91. static void main_ap_separated_stack(void);
  92. #endif
  93.  
  94. /** Bootstrap CPU main kernel routine
  95.  *
  96.  * Initializes the kernel by bootstrap CPU.
  97.  * This function passes control directly to
  98.  * main_bsp_separated_stack().
  99.  *
  100.  * Assuming interrupts_disable().
  101.  *
  102.  */
  103. void main_bsp(void)
  104. {
  105.     __address stackaddr;
  106.  
  107.     config.cpu_count = 1;
  108.     config.cpu_active = 1;
  109.    
  110.     config.base = hardcoded_load_address;
  111.     config.memory_size = get_memory_size();
  112.     config.init_addr = init_addr;
  113.     config.init_size = init_size;
  114.    
  115.     config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
  116.     stackaddr = config.base + config.kernel_size;
  117.     /* Avoid placing kernel on top of init */
  118.     if (overlaps(stackaddr,CONFIG_STACK_SIZE,
  119.              config.init_addr, config.init_size)) {
  120.        
  121.         stackaddr = ALIGN_UP(config.init_addr+config.init_size,
  122.                      CONFIG_STACK_SIZE);
  123.         config.init_size = ALIGN_UP(config.init_size,CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
  124.     } else {
  125.         config.kernel_size += CONFIG_STACK_SIZE;
  126.     }
  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.     if (config.init_size > 0)
  192.         printf("config.init_addr=%P, config.init_size=%d\n", config.init_addr, config.init_size);
  193.  
  194.     /*
  195.      * Create kernel task.
  196.      */
  197.     k = task_create(AS_KERNEL);
  198.     if (!k)
  199.         panic("can't create kernel task\n");
  200.    
  201.     /*
  202.      * Create the first thread.
  203.      */
  204.     t = thread_create(kinit, NULL, k, 0);
  205.     if (!t)
  206.         panic("can't create kinit thread\n");
  207.     thread_ready(t);
  208.    
  209.     /*
  210.      * This call to scheduler() will return to kinit,
  211.      * starting the thread of kernel threads.
  212.      */
  213.     scheduler();
  214.     /* not reached */
  215. }
  216.  
  217.  
  218. #ifdef CONFIG_SMP
  219. /** Application CPUs main kernel routine
  220.  *
  221.  * Executed by application processors, temporary stack
  222.  * is at ctx.sp which was set during BP boot.
  223.  * This function passes control directly to
  224.  * main_ap_separated_stack().
  225.  *
  226.  * Assuming interrupts_disable()'d.
  227.  *
  228.  */
  229. void main_ap(void)
  230. {
  231.     /*
  232.      * Incrementing the active CPU counter will guarantee that the
  233.      * pm_init() will not attempt to build GDT and IDT tables again.
  234.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  235.      * will do.
  236.      */
  237.     config.cpu_active++;
  238.  
  239.     /*
  240.      * The THE structure is well defined because ctx.sp is used as stack.
  241.      */
  242.     the_initialize(THE);
  243.    
  244.     arch_pre_mm_init();
  245.     frame_init();
  246.     page_init();
  247.     tlb_init();
  248.     arch_post_mm_init();
  249.    
  250.     cpu_init();
  251.    
  252.     calibrate_delay_loop();
  253.  
  254.     l_apic_init();
  255.     l_apic_debug();
  256.  
  257.     the_copy(THE, (the_t *) CPU->stack);
  258.  
  259.     /*
  260.      * If we woke kmp up before we left the kernel stack, we could
  261.      * collide with another CPU coming up. To prevent this, we
  262.      * switch to this cpu's private stack prior to waking kmp up.
  263.      */
  264.     context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
  265.     context_restore(&CPU->saved_context);
  266.     /* not reached */
  267. }
  268.  
  269.  
  270. /** Application CPUs main kernel routine stack wrapper
  271.  *
  272.  * Second part of main_ap().
  273.  *
  274.  */
  275. void main_ap_separated_stack(void)
  276. {
  277.     /*
  278.      * Configure timeouts for this cpu.
  279.      */
  280.     timeout_init();
  281.  
  282.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  283.     scheduler();
  284.     /* not reached */
  285. }
  286. #endif /* CONFIG_SMP */
  287.