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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 <arch/context.h>
  31. #include <print.h>
  32. #include <config.h>
  33. #include <time/clock.h>
  34. #include <proc/scheduler.h>
  35. #include <proc/thread.h>
  36. #include <proc/task.h>
  37. #include <mm/vm.h>
  38. #include <main/kinit.h>
  39. #include <cpu.h>
  40. #include <mm/heap.h>
  41.  
  42. #ifdef __SMP__
  43. #include <arch/smp/apic.h>
  44. #include <arch/smp/mps.h>
  45. #endif /* __SMP__ */
  46.  
  47. #include <smp/smp.h>
  48.  
  49. #include <mm/frame.h>
  50. #include <mm/page.h>
  51. #include <mm/tlb.h>
  52. #include <synch/waitq.h>
  53.  
  54. #include <arch.h>
  55.  
  56. char *project = "SPARTAN kernel";
  57. char *copyright = "Copyright (C) 2001-2005 Jakub Jermar";
  58.  
  59. config_t config;
  60. context_t ctx;
  61.  
  62. /*
  63.  * These 'hardcoded' variables will be intialised by
  64.  * the linker with appropriate sizes and addresses.
  65.  */
  66. __u32 hardcoded_load_address = 0;
  67. __u32 hardcoded_ktext_size = 0;
  68. __u32 hardcoded_kdata_size = 0;
  69.  
  70. void main_bsp(void);
  71. void main_ap(void);
  72.  
  73. /*
  74.  * These two functions prevent stack from underflowing during the
  75.  * kernel boot phase when SP is set to the very top of the reserved
  76.  * space. The stack could get corrupted by a fooled compiler-generated
  77.  * pop sequence otherwise.
  78.  */
  79. static void main_bsp_separated_stack(void);
  80. static void main_ap_separated_stack(void);
  81.  
  82. /*
  83.  * Executed by the bootstrap processor. cpu_priority_high()'d
  84.  */
  85. void main_bsp(void)
  86. {
  87.     config.cpu_count = 1;
  88.     config.cpu_active = 1;
  89.  
  90.     config.base = hardcoded_load_address;
  91.     config.memory_size = CONFIG_MEMORY_SIZE;
  92.     config.kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE + CONFIG_STACK_SIZE;
  93.  
  94.     context_save(&ctx);
  95.     ctx.sp = config.base + config.kernel_size - 8;
  96.     ctx.pc = (__address) main_bsp_separated_stack;
  97.     context_restore(&ctx);
  98.     /* not reached */
  99. }
  100.  
  101. void main_bsp_separated_stack(void) {
  102.     vm_t *m;
  103.     task_t *k;
  104.     thread_t *t;
  105.  
  106.     arch_pre_mm_init();
  107.  
  108.     heap_init(config.base + hardcoded_ktext_size + hardcoded_kdata_size, CONFIG_HEAP_SIZE);
  109.     frame_init();
  110.     page_init();
  111.     tlb_init();
  112.  
  113.     arch_post_mm_init();
  114.  
  115.     printf("%s, %s\n", project, copyright);
  116.  
  117.     printf("%L: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
  118.         config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
  119.  
  120.     arch_late_init();
  121.    
  122.     smp_init();
  123.     printf("config.cpu_count=%d\n", config.cpu_count);
  124.  
  125.     cpu_init();
  126.     calibrate_delay_loop();
  127.  
  128.     timeout_init();
  129.     scheduler_init();
  130.     task_init();
  131.     thread_init();
  132.  
  133.     /*
  134.      * Create kernel vm mapping.
  135.      */
  136.     m = vm_create();
  137.     if (!m) panic("can't create kernel vm address space\n");
  138.  
  139.     /*
  140.      * Create kernel task.
  141.      */
  142.     k = task_create(m);
  143.     if (!k) panic("can't create kernel task\n");
  144.  
  145.     /*
  146.      * Create the first thread.
  147.      */
  148.     t = thread_create(kinit, NULL, k, 0);
  149.     if (!t) panic("can't create kinit thread\n");
  150.  
  151.     thread_ready(t);
  152.  
  153.     /*
  154.      * This call to scheduler() will return to kinit,
  155.      * starting the thread of kernel threads.
  156.      */
  157.     scheduler();
  158.     /* not reached */
  159. }
  160.  
  161. #ifdef __SMP__
  162. /*
  163.  * Executed by application processors. cpu_priority_high()'d
  164.  * Temporary stack is at ctx.sp which was set during BP boot.
  165.  */
  166. void main_ap(void)
  167. {
  168.     /*
  169.      * Incrementing the active CPU counter will guarantee that the
  170.      * pm_init() will not attempt to build GDT and IDT tables again.
  171.      * Neither frame_init() will do the complete thing. Neither cpu_init()
  172.      * will do.
  173.      */
  174.     config.cpu_active++;
  175.  
  176.     arch_pre_mm_init();
  177.     frame_init();
  178.     page_init();
  179.     arch_post_mm_init();
  180.  
  181.     cpu_init();
  182.     calibrate_delay_loop();
  183.  
  184.     l_apic_init();
  185.     l_apic_debug();
  186.  
  187.  
  188.     /*
  189.      * If we woke kmp up before we left the kernel stack, we could
  190.      * collide with another CPU coming up. To prevent this, we
  191.      * switch to this cpu's private stack prior to waking kmp up.
  192.      */
  193.     CPU->saved_context.sp = (__address) &CPU->stack[CPU_STACK_SIZE-8];
  194.     CPU->saved_context.pc = (__address) main_ap_separated_stack;
  195.     context_restore(&CPU->saved_context);
  196.     /* not reached */
  197. }
  198.  
  199. void main_ap_separated_stack(void)
  200. {
  201.     /*
  202.      * Configure timeouts for this cpu.
  203.      */
  204.     timeout_init();
  205.  
  206.     waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
  207.     scheduler();
  208.     /* not reached */
  209. }
  210. #endif /* __SMP__*/
  211.