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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 xen32  
  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.     uintptr_t l_apic_address, io_apic_address;
  65.  
  66.     if (acpi_madt) {
  67.         acpi_madt_parse();
  68.         ops = &madt_config_operations;
  69.     }
  70.     if (config.cpu_count == 1) {
  71.         mps_init();
  72.         ops = &mps_config_operations;
  73.     }
  74.  
  75.     l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA);
  76.     if (!l_apic_address)
  77.         panic("cannot allocate address for l_apic\n");
  78.  
  79.     io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA);
  80.     if (!io_apic_address)
  81.         panic("cannot allocate address for io_apic\n");
  82.  
  83.     if (config.cpu_count > 1) {    
  84.         page_mapping_insert(AS_KERNEL, l_apic_address, (uintptr_t) l_apic,
  85.                   PAGE_NOT_CACHEABLE);
  86.         page_mapping_insert(AS_KERNEL, io_apic_address, (uintptr_t) io_apic,
  87.                   PAGE_NOT_CACHEABLE);
  88.                  
  89.         l_apic = (uint32_t *) l_apic_address;
  90.         io_apic = (uint32_t *) io_apic_address;
  91.         }
  92. }
  93.  
  94. /*
  95.  * Kernel thread for bringing up application processors. It becomes clear
  96.  * that we need an arrangement like this (AP's being initialized by a kernel
  97.  * thread), for a thread has its dedicated stack. (The stack used during the
  98.  * BSP initialization (prior the very first call to scheduler()) will be used
  99.  * as an initialization stack for each AP.)
  100.  */
  101. void kmp(void *arg)
  102. {
  103.     int i;
  104.    
  105.     ASSERT(ops != NULL);
  106.  
  107.     waitq_initialize(&ap_completion_wq);
  108.  
  109.     /*
  110.      * We need to access data in frame 0.
  111.      * We boldly make use of kernel address space mapping.
  112.      */
  113.  
  114.     /*
  115.      * Save 0xa to address 0xf of the CMOS RAM.
  116.      * BIOS will not do the POST after the INIT signal.
  117.      */
  118.     outb(0x70,0xf);
  119.     outb(0x71,0xa);
  120.  
  121.     pic_disable_irqs(0xffff);
  122.     apic_init();
  123.  
  124.     for (i = 0; i < ops->cpu_count(); i++) {
  125.         struct descriptor *gdt_new;
  126.    
  127.         /*
  128.          * Skip processors marked unusable.
  129.          */
  130.         if (!ops->cpu_enabled(i))
  131.             continue;
  132.  
  133.         /*
  134.          * The bootstrap processor is already up.
  135.          */
  136.         if (ops->cpu_bootstrap(i))
  137.             continue;
  138.  
  139.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  140.             printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i);
  141.             continue;
  142.         }
  143.        
  144.         /*
  145.          * Prepare new GDT for CPU in question.
  146.          */
  147.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor), FRAME_ATOMIC)))
  148.             panic("couldn't allocate memory for GDT\n");
  149.  
  150.         memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
  151.         memsetb((uintptr_t)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
  152.         gdtr.base = (uintptr_t) gdt_new;
  153.  
  154.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  155.             /*
  156.              * There may be just one AP being initialized at
  157.              * the time. After it comes completely up, it is
  158.              * supposed to wake us up.
  159.              */
  160.             if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
  161.                 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));
  162.         } else
  163.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  164.     }
  165. }
  166.  
  167. int smp_irq_to_pin(int irq)
  168. {
  169.     ASSERT(ops != NULL);
  170.     return ops->irq_to_pin(irq);
  171. }
  172.  
  173. #endif /* CONFIG_SMP */
  174.  
  175. /** @}
  176.  */
  177.