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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 ia32xen
  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 <genarch/acpi/acpi.h>
  40. #include <genarch/acpi/madt.h>
  41. #include <config.h>
  42. #include <synch/waitq.h>
  43. #include <synch/synch.h>
  44. #include <arch/pm.h>
  45. #include <func.h>
  46. #include <panic.h>
  47. #include <debug.h>
  48. #include <arch/asm.h>
  49. #include <mm/frame.h>
  50. #include <mm/page.h>
  51. #include <mm/slab.h>
  52. #include <mm/as.h>
  53. #include <print.h>
  54. #include <memstr.h>
  55.  
  56. #ifdef CONFIG_SMP
  57.  
  58. static struct smp_config_operations *ops = NULL;
  59.  
  60. void smp_init(void)
  61. {
  62.     uintptr_t l_apic_address, io_apic_address;
  63.  
  64.     if (acpi_madt) {
  65.         acpi_madt_parse();
  66.         ops = &madt_config_operations;
  67.     }
  68.     if (config.cpu_count == 1) {
  69.         mps_init();
  70.         ops = &mps_config_operations;
  71.     }
  72.  
  73.     l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA);
  74.     if (!l_apic_address)
  75.         panic("cannot allocate address for l_apic\n");
  76.  
  77.     io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_ATOMIC | FRAME_KA);
  78.     if (!io_apic_address)
  79.         panic("cannot allocate address for io_apic\n");
  80.  
  81.     if (config.cpu_count > 1) {    
  82.         page_mapping_insert(AS_KERNEL, l_apic_address, (uintptr_t) l_apic,
  83.                   PAGE_NOT_CACHEABLE | PAGE_WRITE);
  84.         page_mapping_insert(AS_KERNEL, io_apic_address, (uintptr_t) io_apic,
  85.                   PAGE_NOT_CACHEABLE | PAGE_WRITE);
  86.                  
  87.         l_apic = (uint32_t *) l_apic_address;
  88.         io_apic = (uint32_t *) io_apic_address;
  89.     }
  90. }
  91.  
  92. /*
  93.  * Kernel thread for bringing up application processors. It becomes clear
  94.  * that we need an arrangement like this (AP's being initialized by a kernel
  95.  * thread), for a thread has its dedicated stack. (The stack used during the
  96.  * BSP initialization (prior the very first call to scheduler()) will be used
  97.  * as an initialization stack for each AP.)
  98.  */
  99. void kmp(void *arg)
  100. {
  101.     unsigned int i;
  102.    
  103.     ASSERT(ops != NULL);
  104.  
  105.     waitq_initialize(&ap_completion_wq);
  106.  
  107.     /*
  108.      * We need to access data in frame 0.
  109.      * We boldly make use of kernel address space mapping.
  110.      */
  111.  
  112.     /*
  113.      * Save 0xa to address 0xf of the CMOS RAM.
  114.      * BIOS will not do the POST after the INIT signal.
  115.      */
  116.     outb(0x70,0xf);
  117.     outb(0x71,0xa);
  118.  
  119. //  pic_disable_irqs(0xffff);
  120.     apic_init();
  121.  
  122.     for (i = 0; i < ops->cpu_count(); i++) {
  123.         struct descriptor *gdt_new;
  124.    
  125.         /*
  126.          * Skip processors marked unusable.
  127.          */
  128.         if (!ops->cpu_enabled(i))
  129.             continue;
  130.  
  131.         /*
  132.          * The bootstrap processor is already up.
  133.          */
  134.         if (ops->cpu_bootstrap(i))
  135.             continue;
  136.  
  137.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  138.             printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i);
  139.             continue;
  140.         }
  141.        
  142.         /*
  143.          * Prepare new GDT for CPU in question.
  144.          */
  145.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS * sizeof(struct descriptor), FRAME_ATOMIC)))
  146.             panic("couldn't allocate memory for GDT\n");
  147.  
  148.         memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));
  149.         memsetb((uintptr_t)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
  150.         gdtr.base = (uintptr_t) gdt_new;
  151.  
  152.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  153.             /*
  154.              * There may be just one AP being initialized at
  155.              * the time. After it comes completely up, it is
  156.              * supposed to wake us up.
  157.              */
  158.             if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
  159.                 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));
  160.         } else
  161.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  162.     }
  163. }
  164.  
  165. int smp_irq_to_pin(unsigned int irq)
  166. {
  167.     ASSERT(ops != NULL);
  168.     return ops->irq_to_pin(irq);
  169. }
  170.  
  171. #endif /* CONFIG_SMP */
  172.  
  173. /** @}
  174.  */
  175.