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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.     {
  54.         (uint8_t *) "APIC",
  55.         (void *) &acpi_madt,
  56.         "Multiple APIC Description Table"
  57.     }
  58. };
  59.  
  60. static int rsdp_check(uint8_t *rsdp) {
  61.     struct acpi_rsdp *r = (struct acpi_rsdp *) rsdp;
  62.     uint8_t sum = 0;
  63.     unsigned int i;
  64.    
  65.     for (i = 0; i < 20; i++)
  66.         sum = (uint8_t) (sum + rsdp[i]);
  67.        
  68.     if (sum)   
  69.         return 0; /* bad checksum */
  70.  
  71.     if (r->revision == 0)
  72.         return 1; /* ACPI 1.0 */
  73.        
  74.     for (; i < r->length; i++)
  75.         sum = (uint8_t) (sum + rsdp[i]);
  76.        
  77.     return !sum;
  78.    
  79. }
  80.  
  81. int acpi_sdt_check(uint8_t *sdt)
  82. {
  83.     struct acpi_sdt_header *h = (struct acpi_sdt_header *) sdt;
  84.     uint8_t sum = 0;
  85.     unsigned int i;
  86.  
  87.     for (i = 0; i < h->length; i++)
  88.         sum = (uint8_t) (sum + sdt[i]);
  89.        
  90.     return !sum;
  91. }
  92.  
  93. static void map_sdt(struct acpi_sdt_header *sdt)
  94. {
  95.     page_mapping_insert(AS_KERNEL, (uintptr_t) sdt, (uintptr_t) sdt, PAGE_NOT_CACHEABLE | PAGE_WRITE);
  96.     map_structure((uintptr_t) sdt, sdt->length);
  97. }
  98.  
  99. static void configure_via_rsdt(void)
  100. {
  101.     unsigned int i, j, cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint32_t);
  102.    
  103.     for (i = 0; i < cnt; i++) {
  104.         for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
  105.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) (unative_t) acpi_rsdt->entry[i];
  106.        
  107.             map_sdt(h);
  108.             if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
  109.                 if (!acpi_sdt_check((uint8_t *) h))
  110.                     goto next;
  111.                 *signature_map[j].sdt_ptr = h;
  112.                 LOG("%p: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  113.             }
  114.         }
  115. next:
  116.         ;
  117.     }
  118. }
  119.  
  120. static void configure_via_xsdt(void)
  121. {
  122.     unsigned int i, j, cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header)) / sizeof(uint64_t);
  123.    
  124.     for (i = 0; i < cnt; i++) {
  125.         for (j = 0; j < sizeof(signature_map) / sizeof(struct acpi_signature_map); j++) {
  126.             struct acpi_sdt_header *h = (struct acpi_sdt_header *) ((uintptr_t) acpi_rsdt->entry[i]);
  127.  
  128.             map_sdt(h);
  129.             if (*((uint32_t *) &h->signature[0]) == *((uint32_t *) &signature_map[j].signature[0])) {
  130.                 if (!acpi_sdt_check((uint8_t *) h))
  131.                     goto next;
  132.                 *signature_map[j].sdt_ptr = h;
  133.                 LOG("%p: ACPI %s\n", *signature_map[j].sdt_ptr, signature_map[j].description);
  134.             }
  135.         }
  136. next:
  137.         ;
  138.     }
  139.  
  140. }
  141.  
  142. void acpi_init(void)
  143. {
  144.     uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xe0000) };
  145.     int i, j, length[2] = { 1024, 128*1024 };
  146.     uint64_t *sig = (uint64_t *) RSDP_SIGNATURE;
  147.  
  148.     /*
  149.      * Find Root System Description Pointer
  150.      * 1. search first 1K of EBDA
  151.      * 2. search 128K starting at 0xe0000
  152.      */
  153.  
  154.     addr[0] = (uint8_t *) PA2KA(ebda);
  155.     for (i = (ebda ? 0 : 1); i < 2; i++) {
  156.         for (j = 0; j < length[i]; j += 16) {
  157.             if (*((uint64_t *) &addr[i][j]) == *sig && rsdp_check(&addr[i][j])) {
  158.                 acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
  159.                 goto rsdp_found;
  160.             }
  161.         }
  162.     }
  163.  
  164.     return;
  165.  
  166. rsdp_found:
  167.     LOG("%p: ACPI Root System Description Pointer\n", acpi_rsdp);
  168.  
  169.     acpi_rsdt = (struct acpi_rsdt *) (unative_t) acpi_rsdp->rsdt_address;
  170.     if (acpi_rsdp->revision) acpi_xsdt = (struct acpi_xsdt *) ((uintptr_t) acpi_rsdp->xsdt_address);
  171.  
  172.     if (acpi_rsdt) map_sdt((struct acpi_sdt_header *) acpi_rsdt);
  173.     if (acpi_xsdt) map_sdt((struct acpi_sdt_header *) acpi_xsdt);  
  174.  
  175.     if (acpi_rsdt && !acpi_sdt_check((uint8_t *) acpi_rsdt)) {
  176.         printf("RSDT: bad checksum\n");
  177.         return;
  178.     }
  179.     if (acpi_xsdt && !acpi_sdt_check((uint8_t *) acpi_xsdt)) {
  180.         printf("XSDT: bad checksum\n");
  181.         return;
  182.     }
  183.  
  184.     if (acpi_xsdt) configure_via_xsdt();
  185.     else if (acpi_rsdt) configure_via_rsdt();
  186.  
  187. }
  188.  
  189. /** @}
  190.  */
  191.