1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2009-2011 Erwan Velu - All Rights Reserved
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom
11 * the Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall
15 * be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * -----------------------------------------------------------------------
27 */
28
29 #include <stdio.h>
30 #include <string.h>
31 #include <memory.h>
32 #include <stdlib.h>
33 #include "acpi/acpi.h"
34
parse_xsdt(s_acpi * acpi)35 int parse_xsdt(s_acpi * acpi)
36 {
37 /* Let's seach for XSDT table */
38 uint8_t *q;
39
40 /* Let's start for the base address */
41 q = acpi->xsdt.address;
42
43 /* If address is null return an error */
44 if (q == 0 ) {
45 DEBUG_PRINT(("XSDT is null, exiting\n"));
46 return -XSDT_TABLE_FOUND;
47 }
48
49 DEBUG_PRINT(("Searching XSDT at %p",q));
50 /* Searching for MADT with APIC signature */
51 if (memcmp(q, XSDT, sizeof(XSDT) - 1) == 0) {
52 s_xsdt *x = &acpi->xsdt;
53 x->valid = true;
54 get_acpi_description_header(q, &x->header);
55 DEBUG_PRINT(("XSDT table found at %p : length=%d\n",x->address,x->header.length));
56 DEBUG_PRINT(("Expected Tables = %d\n",(x->header.length-ACPI_HEADER_SIZE)/8));
57
58 /* We now have a set of pointers to some tables */
59 uint64_t *p = NULL;
60 for (p = ((uint64_t *)(x->address + ACPI_HEADER_SIZE));
61 p < ((uint64_t *)(x->address + x->header.length)); p++) {
62 DEBUG_PRINT((" Looking for HEADER at %p = %x\n",p,*p));
63
64 /* Let's grab the pointed table header */
65 char address[16] = { 0 };
66 sprintf(address, "%llx", *p);
67 uint64_t *pointed_address = (uint64_t *)strtoul(address, NULL, 16);
68
69 x->entry[x->entry_count] = pointed_address;
70 if (parse_header(pointed_address, acpi)) {
71 x->entry_count++;
72 }
73 }
74 return XSDT_TABLE_FOUND;
75 }
76 return -XSDT_TABLE_FOUND;
77 }
78