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  1. /*
  2.  * Copyright (C) 2005 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.  /** @addtogroup ia32  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <smp/smp.h>
  36. #include <arch/smp/smp.h>
  37. #include <arch/smp/mps.h>
  38. #include <arch/smp/ap.h>
  39. #include <arch/boot/boot.h>
  40. #include <genarch/acpi/acpi.h>
  41. #include <genarch/acpi/madt.h>
  42. #include <config.h>
  43. #include <synch/waitq.h>
  44. #include <synch/synch.h>
  45. #include <arch/pm.h>
  46. #include <func.h>
  47. #include <panic.h>
  48. #include <debug.h>
  49. #include <arch/asm.h>
  50. #include <mm/frame.h>
  51. #include <mm/page.h>
  52. #include <mm/slab.h>
  53. #include <mm/as.h>
  54. #include <print.h>
  55. #include <memstr.h>
  56. #include <arch/drivers/i8259.h>
  57.  
  58. #ifdef CONFIG_SMP
  59.  
  60. static struct smp_config_operations *ops = NULL;
  61.  
  62. void smp_init(void)
  63. {
  64.     int status;
  65.     __address l_apic_address, io_apic_address;
  66.  
  67.     if (acpi_madt) {
  68.         acpi_madt_parse();
  69.         ops = &madt_config_operations;
  70.     }
  71.     if (config.cpu_count == 1) {
  72.         mps_init();
  73.         ops = &mps_config_operations;
  74.     }
  75.  
  76.     l_apic_address = (__address) frame_alloc_rc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA, &status);
  77.     if (status != FRAME_OK)
  78.         panic("cannot allocate address for l_apic\n");
  79.  
  80.     io_apic_address = (__address) frame_alloc_rc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA, &status);
  81.     if (status != FRAME_OK)
  82.         panic("cannot allocate address for io_apic\n");
  83.  
  84.     if (config.cpu_count > 1) {    
  85.         page_mapping_insert(AS_KERNEL, l_apic_address, (__address) l_apic,
  86.                   PAGE_NOT_CACHEABLE);
  87.         page_mapping_insert(AS_KERNEL, io_apic_address, (__address) io_apic,
  88.                   PAGE_NOT_CACHEABLE);
  89.                  
  90.         l_apic = (__u32 *) l_apic_address;
  91.         io_apic = (__u32 *) io_apic_address;
  92.         }
  93. }
  94.  
  95. /*
  96.  * Kernel thread for bringing up application processors. It becomes clear
  97.  * that we need an arrangement like this (AP's being initialized by a kernel
  98.  * thread), for a thread has its dedicated stack. (The stack used during the
  99.  * BSP initialization (prior the very first call to scheduler()) will be used
  100.  * as an initialization stack for each AP.)
  101.  */
  102. void kmp(void *arg)
  103. {
  104.     int i;
  105.    
  106.     ASSERT(ops != NULL);
  107.  
  108.     waitq_initialize(&ap_completion_wq);
  109.  
  110.     /*
  111.      * We need to access data in frame 0.
  112.      * We boldly make use of kernel address space mapping.
  113.      */
  114.  
  115.     /*
  116.      * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
  117.      */
  118.     *((__u16 *) (PA2KA(0x467+0))) =  ((__address) ap_boot) >> 4;    /* segment */
  119.     *((__u16 *) (PA2KA(0x467+2))) =  0;             /* offset */
  120.    
  121.     /*
  122.      * Save 0xa to address 0xf of the CMOS RAM.
  123.      * BIOS will not do the POST after the INIT signal.
  124.      */
  125.     outb(0x70,0xf);
  126.     outb(0x71,0xa);
  127.  
  128.     pic_disable_irqs(0xffff);
  129.     apic_init();
  130.  
  131.     for (i = 0; i < ops->cpu_count(); i++) {
  132.         struct descriptor *gdt_new;
  133.    
  134.         /*
  135.          * Skip processors marked unusable.
  136.          */
  137.         if (!ops->cpu_enabled(i))
  138.             continue;
  139.  
  140.         /*
  141.          * The bootstrap processor is already up.
  142.          */
  143.         if (ops->cpu_bootstrap(i))
  144.             continue;
  145.  
  146.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  147.             printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i);
  148.             continue;
  149.         }
  150.        
  151.         /*
  152.          * Prepare new GDT for CPU in question.
  153.          */
  154.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor), FRAME_ATOMIC)))
  155.             panic("couldn't allocate memory for GDT\n");
  156.  
  157.         memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
  158.         memsetb((__address)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
  159.         protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);
  160.         protected_ap_gdtr.base = KA2PA((__address) gdt_new);
  161.         gdtr.base = (__address) gdt_new;
  162.  
  163.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  164.             /*
  165.              * There may be just one AP being initialized at
  166.              * the time. After it comes completely up, it is
  167.              * supposed to wake us up.
  168.              */
  169.             if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
  170.                 printf("%s: waiting for cpu%d (APIC ID = %d) timed out\n", __FUNCTION__, config.cpu_active > i ? config.cpu_active : i, ops->cpu_apic_id(i));
  171.         } else
  172.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  173.     }
  174. }
  175.  
  176. int smp_irq_to_pin(int irq)
  177. {
  178.     ASSERT(ops != NULL);
  179.     return ops->irq_to_pin(irq);
  180. }
  181.  
  182. #endif /* CONFIG_SMP */
  183.  
  184.  /** @}
  185.  */
  186.  
  187.