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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.  
  67. context_t ctx;
  68.  
  69. /**
  70.  * These 'hardcoded' variables will be intialized by
  71.  * the linker or the low level assembler code with
  72.  * appropriate sizes and addresses.
  73.  */
  74. __address hardcoded_load_address = 0;
  75. size_t hardcoded_ktext_size = 0;
  76. size_t hardcoded_kdata_size = 0;
  77.  
  78. __address init_addr = 0;
  79. size_t init_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. /** Bootstrap CPU main kernel routine
  96.  *
  97.  * Initializes the kernel by bootstrap CPU.
  98.  * This function passes control directly to
  99.  * main_bsp_separated_stack().
  100.  *
  101.  * Assuming interrupts_disable().
  102.  *
  103.  */
  104. void main_bsp(void)
  105. {
  106.     __address stackaddr;
  107.  
  108.     config.cpu_count = 1;
  109.     config.cpu_active = 1;
  110.    
  111.     config.base = hardcoded_load_address;
  112.     config.memory_size = get_memory_size();
  113.     config.init_addr = init_addr;
  114.     config.init_size = init_size;
  115.    
  116.     config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
  117.     stackaddr = config.base + config.kernel_size;
  118.     /* Avoid placing kernel on top of init */
  119.     if (overlaps(stackaddr,CONFIG_STACK_SIZE,
  120.              config.init_addr, config.init_size)) {
  121.        
  122.         stackaddr = ALIGN_UP(config.init_addr+config.init_size,
  123.                      CONFIG_STACK_SIZE);
  124.         config.init_size = ALIGN_UP(config.init_size,CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
  125.     } else {
  126.         config.kernel_size += CONFIG_STACK_SIZE;
  127.     }
  128.    
  129.     context_save(&ctx);
  130.     context_set(&ctx, FADDR(main_bsp_separated_stack),
  131.             stackaddr, CONFIG_STACK_SIZE);
  132.     context_restore(&ctx);
  133.     /* not reached */
  134. }
  135.  
  136.  
  137. /** Bootstrap CPU main kernel routine stack wrapper
  138.  *
  139.  * Second part of main_bsp().
  140.  *
  141.  */
  142. void main_bsp_separated_stack(void)
  143. {
  144.     task_t *k;
  145.     thread_t *t;
  146.    
  147.     the_initialize(THE);
  148.     /*
  149.      * kconsole data structures must be initialized very early
  150.      * because other subsystems will register their respective
  151.      * commands.
  152.      */
  153.     kconsole_init();
  154.  
  155.     /*
  156.      * Exception handler initialization, before architecture
  157.      * starts adding its own handlers
  158.      */
  159.     exc_init();
  160.  
  161.     /*
  162.      * Memory management subsystems initialization.
  163.      */
  164.     arch_pre_mm_init();
  165.     /* Initialize at least 1 memory segment big enough for slab to work */
  166.     frame_init();
  167.     slab_cache_init();
  168.     as_init();
  169.     page_init();
  170.     tlb_init();
  171.     arch_post_mm_init();   
  172.     version_print();
  173.  
  174.     printf("%P: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
  175.         config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
  176.  
  177.     arch_pre_smp_init();
  178.     smp_init();
  179.     /* Slab must be initialized AFTER we know the number of processors */
  180.     slab_enable_cpucache();
  181.  
  182.     printf("config.memory_size=%dM\n", config.memory_size/(1024*1024));
  183.     printf("config.cpu_count=%d\n", config.cpu_count);
  184.     cpu_init();
  185.    
  186.     calibrate_delay_loop();
  187.     timeout_init();
  188.     scheduler_init();
  189.     task_init();
  190.     thread_init();
  191.    
  192.     if (config.init_size > 0)
  193.         printf("config.init_addr=%P, config.init_size=%d\n", config.init_addr, config.init_size);
  194.    
  195.     ipc_init();
  196.     /*
  197.      * Create kernel task.
  198.      */
  199.     k = task_create(AS_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);
  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.