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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.  /** @addtogroup genarch   
  31.  * @ingroup others
  32.  * @{
  33.  */
  34.  
  35. /**
  36.  * @file
  37.  * @brief   Advanced Configuration and Power Interface (ACPI) initialization.
  38.  */
  39.  
  40. #include <genarch/acpi/acpi.h>
  41. #include <genarch/acpi/madt.h>
  42. #include <arch/bios/bios.h>
  43. #include <mm/as.h>
  44. #include <mm/page.h>
  45. #include <print.h>
  46.  
  47. #define RSDP_SIGNATURE      "RSD PTR "
  48. #define RSDP_REVISION_OFFS  15
  49.  
  50. struct acpi_rsdp *acpi_rsdp = NULL;
  51. struct acpi_rsdt *acpi_rsdt = NULL;
  52. struct acpi_xsdt *acpi_xsdt = NULL;
  53.  
  54. struct acpi_signature_map signature_map[] = {
  55.     { (__u8 *)"APIC", (void *) &acpi_madt, "Multiple APIC Description Table" }
  56. };
  57.  
  58. static int rsdp_check(__u8 *rsdp) {
  59.     struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
  60.     __u8 sum = 0;
  61.     int i;
  62.    
  63.     for (i=0; i<20; i++)
  64.         sum += rsdp[i];
  65.        
  66.     if (sum)   
  67.         return 0; /* bad checksum */
  68.  
  69.     if (r->revision == 0)
  70.         return 1; /* ACPI 1.0 */
  71.        
  72.     for (; i<r->length; i++)
  73.         sum += rsdp[i];
  74.        
  75.     return !sum;
  76.    
  77. }
  78.  
  79. int acpi_sdt_check(__u8 *sdt)
  80. {
  81.     struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
  82.     __u8 sum = 0;
  83.     int i;
  84.  
  85.     for (i=0; i<h->length; i++)
  86.         sum += sdt[i];
  87.        
  88.     return !sum;
  89. }
  90.  
  91. static void map_sdt(struct acpi_sdt_header *sdt)
  92. {
  93.     page_mapping_insert(AS_KERNEL, (__address) sdt, (__address) sdt, PAGE_NOT_CACHEABLE);
  94.     map_structure((__address) sdt, sdt->length);
  95. }
  96.  
  97. static void configure_via_rsdt(void)
  98. {
  99.     int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u32);
  100.    
  101.     for (i=0; i<cnt; i++) {
  102.         for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
  103.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) (__native) acpi_rsdt->entry[i];
  104.        
  105.             map_sdt(h);
  106.             if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
  107.                 if (!acpi_sdt_check((__u8 *) h))
  108.                     goto next;
  109.                 *signature_map[j].sdt_ptr = h;
  110.                 printf("%#zX: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  111.             }
  112.         }
  113. next:
  114.         ;
  115.     }
  116. }
  117.  
  118. static void configure_via_xsdt(void)
  119. {
  120.     int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header))/sizeof(__u64);
  121.    
  122.     for (i=0; i<cnt; i++) {
  123.         for (j=0; j<sizeof(signature_map)/sizeof(struct acpi_signature_map); j++) {
  124.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((__address) acpi_rsdt->entry[i]);
  125.  
  126.             map_sdt(h);
  127.             if (*((__u32 *) &h->signature[0])==*((__u32 *) &signature_map[j].signature[0])) {
  128.                 if (!acpi_sdt_check((__u8 *) h))
  129.                     goto next;
  130.                 *signature_map[j].sdt_ptr = h;
  131.                 printf("%#zX: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  132.             }
  133.         }
  134. next:
  135.         ;
  136.     }
  137.  
  138. }
  139.  
  140. void acpi_init(void)
  141. {
  142.     __u8 *addr[2] = { NULL, (__u8 *) PA2KA(0xe0000) };
  143.     int i, j, length[2] = { 1024, 128*1024 };
  144.     __u64 *sig = (__u64 *) RSDP_SIGNATURE;
  145.  
  146.     /*
  147.      * Find Root System Description Pointer
  148.      * 1. search first 1K of EBDA
  149.      * 2. search 128K starting at 0xe0000
  150.      */
  151.  
  152.     addr[0] = (__u8 *) PA2KA(ebda);
  153.     for (i = (ebda ? 0 : 1); i < 2; i++) {
  154.         for (j = 0; j < length[i]; j += 16) {
  155.             if (*((__u64 *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
  156.                 acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
  157.                 goto rsdp_found;
  158.             }
  159.         }
  160.     }
  161.  
  162.     return;
  163.  
  164. rsdp_found:
  165.     printf("%#zX: ACPI Root System Description Pointer\n", acpi_rsdp);
  166.  
  167.     acpi_rsdt = (struct acpi_rsdt *) (__native) acpi_rsdp->rsdt_address;
  168.     if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((__address) acpi_rsdp->xsdt_address);
  169.  
  170.     if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
  171.     if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);  
  172.  
  173.     if (acpi_rsdt && !acpi_sdt_check((__u8 *) acpi_rsdt)) {
  174.         printf("RSDT: %s\n", "bad checksum");
  175.         return;
  176.     }
  177.     if (acpi_xsdt && !acpi_sdt_check((__u8 *) acpi_xsdt)) {
  178.         printf("XSDT: %s\n", "bad checksum");
  179.         return;
  180.     }
  181.  
  182.     if (acpi_xsdt) configure_via_xsdt();
  183.     else if (acpi_rsdt) configure_via_rsdt();
  184.  
  185. }
  186.  
  187.  
  188.  /** @}
  189.  */
  190.  
  191.