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