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