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  1. /*
  2.  * Copyright (c) 2008 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.     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,
  76.         FRAME_ATOMIC | FRAME_KA);
  77.     if (!l_apic_address)
  78.         panic("Cannot allocate address for l_apic.");
  79.  
  80.     io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,
  81.         FRAME_ATOMIC | FRAME_KA);
  82.     if (!io_apic_address)
  83.         panic("Cannot allocate address for io_apic.");
  84.  
  85.     if (config.cpu_count > 1) {    
  86.         page_mapping_insert(AS_KERNEL, l_apic_address,
  87.             (uintptr_t) l_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  88.         page_mapping_insert(AS_KERNEL, io_apic_address,
  89.             (uintptr_t) io_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  90.                  
  91.         l_apic = (uint32_t *) l_apic_address;
  92.         io_apic = (uint32_t *) io_apic_address;
  93.     }
  94. }
  95.  
  96. /*
  97.  * Kernel thread for bringing up application processors. It becomes clear
  98.  * that we need an arrangement like this (AP's being initialized by a kernel
  99.  * thread), for a thread has its dedicated stack. (The stack used during the
  100.  * BSP initialization (prior the very first call to scheduler()) will be used
  101.  * as an initialization stack for each AP.)
  102.  */
  103. void kmp(void *arg __attribute__((unused)))
  104. {
  105.     unsigned int i;
  106.    
  107.     ASSERT(ops != NULL);
  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.      * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
  116.      */
  117.     *((uint16_t *) (PA2KA(0x467 + 0))) =
  118.         (uint16_t) (((uintptr_t) ap_boot) >> 4);    /* segment */
  119.     *((uint16_t *) (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.     uint8_t apic = l_apic_id();
  132.  
  133.     for (i = 0; i < ops->cpu_count(); i++) {
  134.         struct descriptor *gdt_new;
  135.    
  136.         /*
  137.          * Skip processors marked unusable.
  138.          */
  139.         if (!ops->cpu_enabled(i))
  140.             continue;
  141.  
  142.         /*
  143.          * The bootstrap processor is already up.
  144.          */
  145.         if (ops->cpu_bootstrap(i))
  146.             continue;
  147.  
  148.         if (ops->cpu_apic_id(i) == apic) {
  149.             printf("%s: bad processor entry #%u, will not send IPI "
  150.                 "to myself\n", __FUNCTION__, i);
  151.             continue;
  152.         }
  153.        
  154.         /*
  155.          * Prepare new GDT for CPU in question.
  156.          */
  157.         gdt_new = (struct descriptor *) malloc(GDT_ITEMS *
  158.             sizeof(struct descriptor), FRAME_ATOMIC | FRAME_LOW_4_GiB);
  159.         if (!gdt_new)
  160.             panic("Cannot allocate memory for GDT.");
  161.  
  162.         memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
  163.         memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
  164.         protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);
  165.         protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);
  166.         gdtr.base = (uintptr_t) gdt_new;
  167.  
  168.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  169.             /*
  170.              * There may be just one AP being initialized at
  171.              * the time. After it comes completely up, it is
  172.              * supposed to wake us up.
  173.              */
  174.             if (waitq_sleep_timeout(&ap_completion_wq, 1000000,
  175.                 SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) {
  176.                 unsigned int cpu = (config.cpu_active > i) ?
  177.                     config.cpu_active : i;
  178.                 printf("%s: waiting for cpu%u (APIC ID = %d) "
  179.                     "timed out\n", __FUNCTION__, cpu,
  180.                     ops->cpu_apic_id(i));
  181.             }
  182.         } else
  183.             printf("INIT IPI for l_apic%d failed\n",
  184.                 ops->cpu_apic_id(i));
  185.     }
  186. }
  187.  
  188. int smp_irq_to_pin(unsigned int irq)
  189. {
  190.     ASSERT(ops != NULL);
  191.     return ops->irq_to_pin(irq);
  192. }
  193.  
  194. #endif /* CONFIG_SMP */
  195.  
  196. /** @}
  197.  */
  198.