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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 <arch/acpi/acpi.h>
  34. #include <arch/acpi/madt.h>
  35. #include <config.h>
  36. #include <synch/waitq.h>
  37. #include <arch/pm.h>
  38. #include <func.h>
  39. #include <panic.h>
  40. #include <debug.h>
  41. #include <arch/asm.h>
  42. #include <mm/frame.h>
  43. #include <mm/page.h>
  44. #include <mm/heap.h>
  45. #include <print.h>
  46. #include <memstr.h>
  47. #include <arch/i8259.h>
  48.  
  49. #ifdef __SMP__
  50.  
  51. static struct smp_config_operations *ops = NULL;
  52.  
  53. void smp_init(void)
  54. {
  55.     if (acpi_madt) {
  56.         acpi_madt_parse();
  57.         ops = &madt_config_operations;
  58.     }
  59.     if (config.cpu_count == 1) {
  60.         mps_init();
  61.         ops = &mps_config_operations;
  62.     }
  63.  
  64.     if (config.cpu_count > 1) {
  65.         map_page_to_frame((__address) l_apic, (__address) l_apic, PAGE_NOT_CACHEABLE, 0);
  66.         map_page_to_frame((__address) io_apic, (__address) io_apic, PAGE_NOT_CACHEABLE, 0);
  67.         }
  68.  
  69.         /*
  70.          * Must be initialized outside the kmp thread, since it is waited
  71.          * on before the kmp thread is created.
  72.          */
  73.         waitq_initialize(&kmp_completion_wq);
  74.  
  75. }
  76.  
  77. /*
  78.  * Kernel thread for bringing up application processors. It becomes clear
  79.  * that we need an arrangement like this (AP's being initialized by a kernel
  80.  * thread), for a thread has its dedicated stack. (The stack used during the
  81.  * BSP initialization (prior the very first call to scheduler()) will be used
  82.  * as an initialization stack for each AP.)
  83.  */
  84. void kmp(void *arg)
  85. {
  86.     __address src, dst;
  87.     int i;
  88.    
  89.     ASSERT(ops != NULL);
  90.  
  91.     waitq_initialize(&ap_completion_wq);
  92.  
  93.     /*
  94.      * We need to access data in frame 0.
  95.      * We boldly make use of kernel address space mapping.
  96.      */
  97.  
  98.     /*
  99.      * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
  100.      */
  101.     *((__u16 *) (PA2KA(0x467+0))) =  ((__address) ap_boot) >> 4;    /* segment */
  102.     *((__u16 *) (PA2KA(0x467+2))) =  0;             /* offset */
  103.    
  104.     /*
  105.      * Save 0xa to address 0xf of the CMOS RAM.
  106.      * BIOS will not do the POST after the INIT signal.
  107.      */
  108.     outb(0x70,0xf);
  109.     outb(0x71,0xa);
  110.  
  111.     cpu_priority_high();
  112.  
  113.     pic_disable_irqs(0xffff);
  114.     apic_init();
  115.  
  116.     for (i = 0; i < ops->cpu_count(); i++) {
  117.         struct descriptor *gdt_new;
  118.    
  119.         /*
  120.          * Skip processors marked unusable.
  121.          */
  122.         if (!ops->cpu_enabled(i))
  123.             continue;
  124.  
  125.         /*
  126.          * The bootstrap processor is already up.
  127.          */
  128.         if (ops->cpu_bootstrap(i))
  129.             continue;
  130.  
  131.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  132.             printf("kmp: bad processor entry #%d, will not send IPI to myself\n", i);
  133.             continue;
  134.         }
  135.        
  136.         /*
  137.          * Prepare new GDT for CPU in question.
  138.          */
  139.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor))))
  140.             panic("couldn't allocate memory for GDT\n");
  141.  
  142.         memcpy(gdt_new, gdt, GDT_ITEMS*sizeof(struct descriptor));
  143.         memsetb((__address)(&gdt_new[TSS_DES]), sizeof(struct descriptor), 0);
  144.         ap_bootstrap_gdtr.base = KA2PA((__address) gdt_new);
  145.         gdtr.base = (__address) gdt_new;
  146.  
  147.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  148.             /*
  149.                  * There may be just one AP being initialized at
  150.              * the time. After it comes completely up, it is
  151.              * supposed to wake us up.
  152.                  */
  153.             waitq_sleep(&ap_completion_wq);
  154.         }
  155.         else {
  156.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  157.         }
  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. #endif /* __SMP__ */
  168.