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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 __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.         map_page_to_frame((__address)l_apic, (__address)l_apic,
  67.                   PAGE_NOT_CACHEABLE, 0);
  68.         map_page_to_frame((__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.     __address src, dst;
  91.     int i;
  92.    
  93.     ASSERT(ops != NULL);
  94.  
  95.     waitq_initialize(&ap_completion_wq);
  96.  
  97.     /*
  98.      * We need to access data in frame 0.
  99.      * We boldly make use of kernel address space mapping.
  100.      */
  101.  
  102.     /*
  103.      * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
  104.      */
  105.     *((__u16 *) (PA2KA(0x467+0))) =  ((__address) ap_boot) >> 4;    /* segment */
  106.     *((__u16 *) (PA2KA(0x467+2))) =  0;             /* offset */
  107.    
  108.     /*
  109.      * Save 0xa to address 0xf of the CMOS RAM.
  110.      * BIOS will not do the POST after the INIT signal.
  111.      */
  112.     outb(0x70,0xf);
  113.     outb(0x71,0xa);
  114.  
  115.     pic_disable_irqs(0xffff);
  116.     apic_init();
  117.  
  118.     for (i = 0; i < ops->cpu_count(); i++) {
  119.         struct descriptor *gdt_new;
  120.    
  121.         /*
  122.          * Skip processors marked unusable.
  123.          */
  124.         if (!ops->cpu_enabled(i))
  125.             continue;
  126.  
  127.         /*
  128.          * The bootstrap processor is already up.
  129.          */
  130.         if (ops->cpu_bootstrap(i))
  131.             continue;
  132.  
  133.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  134.             printf("%s: bad processor entry #%d, will not send IPI to myself\n", __FUNCTION__, i);
  135.             continue;
  136.         }
  137.        
  138.         /*
  139.          * Prepare new GDT for CPU in question.
  140.          */
  141.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor))))
  142.             panic("couldn't allocate memory for GDT\n");
  143.  
  144.         memcpy(gdt_new, gdt, GDT_ITEMS*sizeof(struct descriptor));
  145.         memsetb((__address)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
  146.         real_bootstrap_gdtr.base = KA2PA((__address) gdt_new);
  147.         gdtr.base = (__address) gdt_new;
  148.  
  149.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  150.             /*
  151.              * There may be just one AP being initialized at
  152.              * the time. After it comes completely up, it is
  153.              * supposed to wake us up.
  154.              */
  155.             if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_BLOCKING) == ESYNCH_TIMEOUT)
  156.                 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));
  157.         } else
  158.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  159.     }
  160.  
  161.     /*
  162.      * Wakeup the kinit thread so that
  163.      * system initialization can go on.
  164.      */
  165.     waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);
  166. }
  167.  
  168. #endif /* __SMP__ */
  169.