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