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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.  
  46. #ifdef __SMP__
  47.  
  48. static struct smp_config_operations *ops = NULL;
  49.  
  50. void smp_init(void)
  51. {
  52.     if (acpi_madt) {
  53.         acpi_madt_parse();
  54.         ops = &madt_config_operations;
  55.     }
  56.     if (config.cpu_count == 1) {
  57.         mps_init();
  58.         ops = &mps_config_operations;
  59.     }
  60.  
  61.     if (config.cpu_count > 1) {
  62.         map_page_to_frame((__address) l_apic, (__address) l_apic, PAGE_NOT_CACHEABLE, 0);
  63.         map_page_to_frame((__address) io_apic, (__address) io_apic, PAGE_NOT_CACHEABLE, 0);
  64.         }
  65.  
  66.         /*
  67.          * Must be initialized outside the kmp thread, since it is waited
  68.          * on before the kmp thread is created.
  69.          */
  70.         waitq_initialize(&kmp_completion_wq);
  71.  
  72. }
  73.  
  74. /*
  75.  * Kernel thread for bringing up application processors. It becomes clear
  76.  * that we need an arrangement like this (AP's being initialized by a kernel
  77.  * thread), for a thread has its dedicated stack. (The stack used during the
  78.  * BSP initialization (prior the very first call to scheduler()) will be used
  79.  * as an initialization stack for each AP.)
  80.  */
  81. void kmp(void *arg)
  82. {
  83.     __address src, dst;
  84.     int i;
  85.  
  86.     ASSERT(ops != NULL);
  87.  
  88.     waitq_initialize(&ap_completion_wq);
  89.  
  90.     /*
  91.      * We need to access data in frame 0.
  92.      * We boldly make use of kernel address space mapping.
  93.      */
  94.  
  95.     /*
  96.      * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()
  97.      */
  98.     *((__u16 *) (PA2KA(0x467+0))) =  ((__address) ap_boot) >> 4;    /* segment */
  99.     *((__u16 *) (PA2KA(0x467+2))) =  0;             /* offset */
  100.    
  101.     /*
  102.      * Save 0xa to address 0xf of the CMOS RAM.
  103.      * BIOS will not do the POST after the INIT signal.
  104.      */
  105.     outb(0x70,0xf);
  106.     outb(0x71,0xa);
  107.  
  108.     cpu_priority_high();
  109.  
  110.     pic_disable_irqs(0xffff);
  111.     apic_init();
  112.  
  113.     for (i = 0; i < ops->cpu_count(); i++) {
  114.         struct descriptor *gdt_new;
  115.    
  116.         /*
  117.          * Skip processors marked unusable.
  118.          */
  119.         if (!ops->cpu_enabled(i))
  120.             continue;
  121.  
  122.         /*
  123.          * The bootstrap processor is already up.
  124.          */
  125.         if (ops->cpu_bootstrap(i))
  126.             continue;
  127.  
  128.         if (ops->cpu_apic_id(i) == l_apic_id()) {
  129.             printf("kmp: bad processor entry #%d, will not send IPI to myself\n", i);
  130.             continue;
  131.         }
  132.        
  133.         /*
  134.          * Prepare new GDT for CPU in question.
  135.          */
  136.         if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor))))
  137.             panic("couldn't allocate memory for GDT\n");
  138.  
  139.         memcopy(gdt, gdt_new, GDT_ITEMS*sizeof(struct descriptor));
  140.         memsetb(&gdt_new[TSS_DES], sizeof(struct descriptor), 0);
  141.         gdtr.base = KA2PA((__address) gdt_new);
  142.  
  143.         if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {
  144.             /*
  145.                  * There may be just one AP being initialized at
  146.              * the time. After it comes completely up, it is
  147.              * supposed to wake us up.
  148.                  */
  149.             waitq_sleep(&ap_completion_wq);
  150.             cpu_priority_high();
  151.         }
  152.         else {
  153.             printf("INIT IPI for l_apic%d failed\n", ops->cpu_apic_id(i));
  154.         }
  155.     }
  156.  
  157.     /*
  158.      * Wakeup the kinit thread so that
  159.      * system initialization can go on.
  160.      */
  161.     waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);
  162. }
  163.  
  164. #endif /* __SMP__ */
  165.