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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. /**
  30.  * @file    acpi.c
  31.  * @brief   Advanced Configuration and Power Interface (ACPI) initialization.
  32.  */
  33.  
  34. #include <genarch/acpi/acpi.h>
  35. #include <genarch/acpi/madt.h>
  36. #include <arch/bios/bios.h>
  37. #include <mm/as.h>
  38. #include <mm/page.h>
  39. #include <print.h>
  40.  
  41. #define RSDP_SIGNATURE      "RSD PTR "
  42. #define RSDP_REVISION_OFFS  15
  43.  
  44. struct acpi_rsdp *acpi_rsdp = NULL;
  45. struct acpi_rsdt *acpi_rsdt = NULL;
  46. struct acpi_xsdt *acpi_xsdt = NULL;
  47.  
  48. struct acpi_signature_map signature_map[] = {
  49.     { (__u8 *)"APIC", (void *) &acpi_madt, "Multiple APIC Description Table" }
  50. };
  51.  
  52. static int rsdp_check(__u8 *rsdp) {
  53.     struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
  54.     __u8 sum = 0;
  55.     int i;
  56.    
  57.     for (i=0; i<20; i++)
  58.         sum += rsdp[i];
  59.        
  60.     if (sum)   
  61.         return 0; /* bad checksum */
  62.  
  63.     if (r->revision == 0)
  64.         return 1; /* ACPI 1.0 */
  65.        
  66.     for (; i<r->length; i++)
  67.         sum += rsdp[i];
  68.        
  69.     return !sum;
  70.    
  71. }
  72.  
  73. int acpi_sdt_check(__u8 *sdt)
  74. {
  75.     struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
  76.     __u8 sum = 0;
  77.     int i;
  78.  
  79.     for (i=0; i<h->length; i++)
  80.         sum += sdt[i];
  81.        
  82.     return !sum;
  83. }
  84.  
  85. static void map_sdt(struct acpi_sdt_header *sdt)
  86. {
  87.     page_mapping_insert(AS_KERNEL, (__address) sdt, (__address) sdt, PAGE_NOT_CACHEABLE);
  88.     map_structure((__address) sdt, sdt->length);
  89. }
  90.  
  91. static void configure_via_rsdt(void)
  92. {
  93.     int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u32);
  94.    
  95.     for (i=0; i<cnt; i++) {
  96.         for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
  97.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) (__native) acpi_rsdt->entry[i];
  98.        
  99.             map_sdt(h);
  100.             if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
  101.                 if (!acpi_sdt_check((__u8 *) h))
  102.                     goto next;
  103.                 *signature_map[j].sdt_ptr = h;
  104.                 printf("%#zX: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  105.             }
  106.         }
  107. next:
  108.         ;
  109.     }
  110. }
  111.  
  112. static void configure_via_xsdt(void)
  113. {
  114.     int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u64);
  115.    
  116.     for (i=0; i<cnt; i++) {
  117.         for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
  118.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((__address) acpi_rsdt->entry[i]);
  119.  
  120.             map_sdt(h);
  121.             if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
  122.                 if (!acpi_sdt_check((__u8 *) h))
  123.                     goto next;
  124.                 *signature_map[j].sdt_ptr = h;
  125.                 printf("%#zX: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  126.             }
  127.         }
  128. next:
  129.         ;
  130.     }
  131.  
  132. }
  133.  
  134. void acpi_init(void)
  135. {
  136.     __u8 *addr[2] = { NULL, (__u8 *) PA2KA(0xe0000) };
  137.     int i, j, length[2] = { 1024, 128*1024 };
  138.     __u64 *sig = (__u64 *) RSDP_SIGNATURE;
  139.  
  140.     /*
  141.      * Find Root System Description Pointer
  142.      * 1. search first 1K of EBDA
  143.      * 2. search 128K starting at 0xe0000
  144.      */
  145.  
  146.     addr[0] = (__u8 *) PA2KA(ebda);
  147.     for (i = (ebda ? 0 : 1); i < 2; i++) {
  148.         for (j = 0; j < length[i]; j += 16) {
  149.             if (*((__u64 *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
  150.                 acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
  151.                 goto rsdp_found;
  152.             }
  153.         }
  154.     }
  155.  
  156.     return;
  157.  
  158. rsdp_found:
  159.     printf("%#zX: ACPI Root System Description Pointer\n", acpi_rsdp);
  160.  
  161.     acpi_rsdt = (struct acpi_rsdt *) (__native) acpi_rsdp->rsdt_address;
  162.     if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((__address) acpi_rsdp->xsdt_address);
  163.  
  164.     if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
  165.     if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);  
  166.  
  167.     if (acpi_rsdt && !acpi_sdt_check((__u8 *) acpi_rsdt)) {
  168.         printf("RSDT: %s\n", "bad checksum");
  169.         return;
  170.     }
  171.     if (acpi_xsdt && !acpi_sdt_check((__u8 *) acpi_xsdt)) {
  172.         printf("XSDT: %s\n", "bad checksum");
  173.         return;
  174.     }
  175.  
  176.     if (acpi_xsdt) configure_via_xsdt();
  177.     else if (acpi_rsdt) configure_via_rsdt();
  178.  
  179. }
  180.  
  181.