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 <stdlib.h>
31 #include <string.h>
32 #include <memory.h>
33 #include <dprintf.h>
34 #include "acpi/acpi.h"
35
search_rsdp(s_acpi * acpi)36 int search_rsdp(s_acpi * acpi)
37 {
38 /* Let's seach for RSDT table */
39 uint8_t *q;
40
41 /* Let's start for the base address */
42 for (q = (uint8_t *)RSDP_MIN_ADDRESS; q < (uint8_t *)RSDP_MAX_ADDRESS; q+=16 ) {
43 /* Searching for RSDP with "RSD PTR" signature */
44 if (memcmp(q, RSDP, sizeof(RSDP)-1) == 0) {
45 s_rsdp *r = &acpi->rsdp;
46 r->valid = true;
47 r->address = q;
48 cp_str_struct(r->signature);
49 cp_struct(&r->checksum);
50 cp_str_struct(r->oem_id);
51 cp_struct(&r->revision);
52 cp_struct(&r->rsdt_address);
53 cp_struct(&r->length);
54 cp_struct(&r->xsdt_address);
55 cp_struct(&r->extended_checksum);
56 q += 3; /* reserved field */
57 acpi->rsdt.address = r->rsdt_address;
58 acpi->xsdt.address = r->xsdt_address;
59 DEBUG_PRINT(("RSDT should be at %p\n",r->rsdt_address));
60 DEBUG_PRINT(("XSDT should be at %p\n",r->xsdt_address));
61 return RSDP_TABLE_FOUND;
62 }
63 }
64 return -RSDP_TABLE_FOUND;
65 }
66
print_rsdp(s_acpi * acpi)67 void print_rsdp(s_acpi * acpi)
68 {
69 s_rsdp *r = &acpi->rsdp;
70
71 if (!r->valid)
72 return;
73 printf("RSDP Table @ 0x%p\n", r->address);
74 printf(" signature : %s\n", r->signature);
75 printf(" checksum : %u\n", r->checksum);
76 printf(" oem id : %s\n", r->oem_id);
77 printf(" revision : %u\n", r->revision);
78 printf(" RDST address : %p\n", r->rsdt_address);
79 printf(" length : %u\n", r->length);
80 printf(" XSDT address : %p\n", r->xsdt_address);
81 printf(" extended checksum : %u\n", r->extended_checksum);
82 }
83