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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 <config.h>
  34. #include <time/clock.h>
  35. #include <proc/scheduler.h>
  36. #include <proc/thread.h>
  37. #include <proc/task.h>
  38. #include <mm/vm.h>
  39. #include <main/kinit.h>
  40. #include <cpu.h>
  41. #include <mm/heap.h>
  42.  
  43. #ifdef __SMP__
  44. #include <arch/smp/apic.h>
  45. #include <arch/smp/mps.h>
  46. #endif /* __SMP__ */
  47.  
  48. #include <smp/smp.h>
  49.  
  50. #include <arch/mm/memory_init.h>
  51. #include <mm/frame.h>
  52. #include <mm/page.h>
  53. #include <mm/tlb.h>
  54. #include <synch/waitq.h>
  55.  
  56. #include <arch/arch.h>
  57. #include <arch.h>
  58. #include <arch/faddr.h>
  59.  
  60. #include <typedefs.h>
  61.  
  62. char *project = "SPARTAN kernel";
  63. char *copyright = "Copyright (C) 2001-2005 Jakub Jermar\nCopyright (C) 2005 HelenOS project";
  64.  
  65. config_t config;
  66. context_t ctx;
  67.  
  68. /*
  69.  * These 'hardcoded' variables will be intialised 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. /*
  78.  * Size of memory in bytes taken by kernel and heap.
  79.  */
  80. static size_t kernel_size;
  81.  
  82. /*
  83.  * Extra space on heap to make the stack start on page boundary.
  84.  */
  85. static size_t heap_delta;
  86.  
  87. void main_bsp(void);
  88. void main_ap(void);
  89.  
  90. /*
  91.  * These two functions prevent stack from underflowing during the
  92.  * kernel boot phase when SP is set to the very top of the reserved
  93.  * space. The stack could get corrupted by a fooled compiler-generated
  94.  * pop sequence otherwise.
  95.  */
  96. static void main_bsp_separated_stack(void);
  97. static void main_ap_separated_stack(void);
  98.  
  99. /** Bootstrap CPU main kernel routine
  100.  *
  101.  * Initializes the kernel by bootstrap CPU.
  102.  *
  103.  * Assuming cpu_priority_high().
  104.  *
  105.  */
  106. void main_bsp(void)
  107. {
  108.     config.cpu_count = 1;
  109.     config.cpu_active = 1;
  110.    
  111.     kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE;    
  112.     heap_delta = PAGE_SIZE - ((hardcoded_load_address + kernel_size) % PAGE_SIZE);
  113.     heap_delta = (heap_delta == PAGE_SIZE) ? 0 : heap_delta;
  114.     kernel_size += heap_delta;
  115.    
  116.     config.base = hardcoded_load_address;
  117.     config.memory_size = get_memory_size();
  118.     config.kernel_size = kernel_size + CONFIG_STACK_SIZE;
  119.    
  120.     context_save(&ctx);
  121.     early_mapping(config.base + hardcoded_ktext_size + hardcoded_kdata_size + heap_delta, CONFIG_STACK_SIZE + CONFIG_HEAP_SIZE);
  122.     context_set(&ctx, FADDR(main_bsp_separated_stack), config.base + kernel_size, CONFIG_STACK_SIZE);
  123.     context_restore(&ctx);
  124.     /* not reached */
  125. }
  126.  
  127.  
  128. /** Bootstrap CPU main kernel routine stack wrapper
  129.  *
  130.  * Second part of main_bsp().
  131.  *
  132.  */
  133. void main_bsp_separated_stack(void)
  134. {
  135.     vm_t *m;
  136.     task_t *k;
  137.     thread_t *t;
  138.    
  139.     the_initialize(THE);
  140.    
  141.     arch_pre_mm_init();
  142.     heap_init(config.base + hardcoded_ktext_size + hardcoded_kdata_size, CONFIG_HEAP_SIZE + heap_delta);
  143.     frame_init();
  144.     page_init();
  145.     tlb_init();
  146.  
  147.     arch_post_mm_init();
  148.  
  149.     printf("%s\n%s\n", project, copyright);
  150.     printf("%P: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
  151.         config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
  152.  
  153.     arch_late_init();
  154.    
  155.     smp_init();
  156.     printf("config.memory_size=%dM\n", config.memory_size/(1024*1024));
  157.     printf("config.cpu_count=%d\n", config.cpu_count);
  158.  
  159.     cpu_init();
  160.  
  161.     calibrate_delay_loop();
  162.    
  163.     timeout_init();
  164.     scheduler_init();
  165.     task_init();
  166.     thread_init();
  167.  
  168.     /*
  169.      * Create kernel vm mapping.
  170.      */
  171.     m = vm_create(GET_PTL0_ADDRESS());
  172.     if (!m)
  173.         panic("can't create kernel vm address space\n");
  174.  
  175.     /*
  176.      * Create kernel task.
  177.      */
  178.     k = task_create(m);
  179.     if (!k)
  180.         panic("can't create kernel task\n");
  181.        
  182.     /*
  183.      * Create the first thread.
  184.      */
  185.     t = thread_create(kinit, NULL, k, 0);
  186.     if (!t)
  187.         panic("can't create kinit thread\n");
  188.     thread_ready(t);
  189.  
  190.     /*
  191.      * This call to scheduler() will return to kinit,
  192.      * starting the thread of kernel threads.
  193.      */
  194.     scheduler();
  195.     /* not reached */
  196. }
  197.  
  198.  
  199. #ifdef __SMP__
  200. /** Application CPUs main kernel routine
  201.  *
  202.  * Executed by application processors, temporary stack
  203.  * is at ctx.sp which was set during BP boot.
  204.  *
  205.  * Assuming  cpu_priority_high().
  206.  *
  207.  */
  208. void main_ap(void)
  209. {
  210.     /*
  211.      * Incrementing the active CPU counter will guarantee that the
  212.      * pm_init() will not attempt to build GDT and IDT tables again.
  213.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  214.      * will do.
  215.      */
  216.     config.cpu_active++;
  217.  
  218.     /*
  219.      * The THE structure is well defined because ctx.sp is used as stack.
  220.      */
  221.     the_initialize(THE);
  222.  
  223.     arch_pre_mm_init();
  224.     frame_init();
  225.     page_init();
  226.     arch_post_mm_init();
  227.  
  228.     cpu_init();
  229.     calibrate_delay_loop();
  230.  
  231.     l_apic_init();
  232.     l_apic_debug();
  233.  
  234.     the_copy(THE, (the_t *) CPU->stack);
  235.  
  236.     /*
  237.      * If we woke kmp up before we left the kernel stack, we could
  238.      * collide with another CPU coming up. To prevent this, we
  239.      * switch to this cpu's private stack prior to waking kmp up.
  240.      */
  241.     context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), CPU->stack, CPU_STACK_SIZE);
  242.     context_restore(&CPU->saved_context);
  243.     /* not reached */
  244. }
  245.  
  246.  
  247. /** Application CPUs main kernel routine stack wrapper
  248.  *
  249.  * Second part of main_ap().
  250.  *
  251.  */
  252. void main_ap_separated_stack(void)
  253. {
  254.     /*
  255.      * Configure timeouts for this cpu.
  256.      */
  257.     timeout_init();
  258.  
  259.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  260.     scheduler();
  261.     /* not reached */
  262. }
  263. #endif /* __SMP__*/
  264.