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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. /** @addtogroup genarch
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   Advanced Configuration and Power Interface (ACPI) initialization.
  36.  */
  37.  
  38. #include <genarch/acpi/acpi.h>
  39. #include <genarch/acpi/madt.h>
  40. #include <arch/bios/bios.h>
  41. #include <mm/as.h>
  42. #include <mm/page.h>
  43. #include <print.h>
  44.  
  45. #define RSDP_SIGNATURE      "RSD PTR "
  46. #define RSDP_REVISION_OFFS  15
  47.  
  48. struct acpi_rsdp *acpi_rsdp = NULL;
  49. struct acpi_rsdt *acpi_rsdt = NULL;
  50. struct acpi_xsdt *acpi_xsdt = NULL;
  51.  
  52. struct acpi_signature_map signature_map[] = {
  53.     { (uint8_t *)"APIC", (void *) &acpi_madt, "Multiple APIC Description Table" }
  54. };
  55.  
  56. static int rsdp_check(uint8_t *rsdp) {
  57.     struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
  58.     uint8_t sum = 0;
  59.     unsigned int i;
  60.    
  61.     for (i = 0; i < 20; i++)
  62.         sum += rsdp[i];
  63.        
  64.     if (sum)   
  65.         return 0; /* bad checksum */
  66.  
  67.     if (r->revision == 0)
  68.         return 1; /* ACPI 1.0 */
  69.        
  70.     for (; i < r->length; i++)
  71.         sum += rsdp[i];
  72.        
  73.     return !sum;
  74.    
  75. }
  76.  
  77. int acpi_sdt_check(uint8_t *sdt)
  78. {
  79.     struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
  80.     uint8_t sum = 0;
  81.     unsigned int i;
  82.  
  83.     for (i = 0; i < h->length; i++)
  84.         sum += sdt[i];
  85.        
  86.     return !sum;
  87. }
  88.  
  89. static void map_sdt(struct acpi_sdt_header *sdt)
  90. {
  91.     page_mapping_insert(AS_KERNEL, (uintptr_t) sdt, (uintptr_t) sdt, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  92.     map_structure((uintptr_t) sdt, sdt->length);
  93. }
  94.  
  95. static void configure_via_rsdt(void)
  96. {
  97.     unsigned int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint32_t);
  98.    
  99.     for (i = 0; i < cnt; i++) {
  100.         for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
  101.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) (unative_t) acpi_rsdt->entry[i];
  102.        
  103.             map_sdt(h);
  104.             if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
  105.                 if (!acpi_sdt_check((uint8_t *) h))
  106.                     goto next;
  107.                 *signature_map[j].sdt_ptr = h;
  108.                 printf("%#zx: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  109.             }
  110.         }
  111. next:
  112.         ;
  113.     }
  114. }
  115.  
  116. static void configure_via_xsdt(void)
  117. {
  118.     unsigned int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint64_t);
  119.    
  120.     for (i = 0; i < cnt; i++) {
  121.         for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
  122.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((uintptr_t) acpi_rsdt->entry[i]);
  123.  
  124.             map_sdt(h);
  125.             if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
  126.                 if (!acpi_sdt_check((uint8_t *) h))
  127.                     goto next;
  128.                 *signature_map[j].sdt_ptr = h;
  129.                 printf("%#zx: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  130.             }
  131.         }
  132. next:
  133.         ;
  134.     }
  135.  
  136. }
  137.  
  138. void acpi_init(void)
  139. {
  140.     uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xe0000) };
  141.     int i, j, length[2] = { 1024, 128*1024 };
  142.     uint64_t *sig = (uint64_t *) RSDP_SIGNATURE;
  143.  
  144.     /*
  145.      * Find Root System Description Pointer
  146.      * 1. search first 1K of EBDA
  147.      * 2. search 128K starting at 0xe0000
  148.      */
  149.  
  150.     addr[0] = (uint8_t *) PA2KA(ebda);
  151.     for (i = (ebda ? 0 : 1); i < 2; i++) {
  152.         for (j = 0; j < length[i]; j += 16) {
  153.             if (*((uint64_t *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
  154.                 acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
  155.                 goto rsdp_found;
  156.             }
  157.         }
  158.     }
  159.  
  160.     return;
  161.  
  162. rsdp_found:
  163.     printf("%#zx: ACPI Root System Description Pointer\n", acpi_rsdp);
  164.  
  165.     acpi_rsdt = (struct acpi_rsdt *) (unative_t) acpi_rsdp->rsdt_address;
  166.     if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((uintptr_t) acpi_rsdp->xsdt_address);
  167.  
  168.     if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
  169.     if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);  
  170.  
  171.     if (acpi_rsdt && !acpi_sdt_check((uint8_t *) acpi_rsdt)) {
  172.         printf("RSDT: %s\n", "bad checksum");
  173.         return;
  174.     }
  175.     if (acpi_xsdt && !acpi_sdt_check((uint8_t *) acpi_xsdt)) {
  176.         printf("XSDT: %s\n", "bad checksum");
  177.         return;
  178.     }
  179.  
  180.     if (acpi_xsdt) configure_via_xsdt();
  181.     else if (acpi_rsdt) configure_via_rsdt();
  182.  
  183. }
  184.  
  185. /** @}
  186.  */
  187.