blob: ebecd6636f56814a8950670af10d70a4da93154b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
#include <rsdp.h>
#include <heap.h>
#include <paging.h>
#include <libk/string.h>
#include <libk/stdio.h>
uint64_t* find_rsdp()
{
map_addr(0x0, 0x0, FLAG_PRESENT);
const char* rsdp_cs = "RSD PTR ";
for (uint64_t i = 0x10; i < 0x100000; i += 0x10) {
char *x = (char*)i;
uint8_t ind = 1;
for (size_t j = 0; j < strlen(rsdp_cs); j++) {
if (rsdp_cs[j] != x[j]) {
ind = 0;
break;
}
}
if (ind) {
return (uint64_t*)i;
}
}
return NULL;
}
uint64_t* find_sys_table_addr(const char* signature)
{
uint64_t* rsdp = find_rsdp();
if (rsdp == NULL) {
printf("RSDP NOT FOUND\n");
return NULL;
}
struct RSDP_descriptor* rsdp_desc = (struct RSDP_descriptor*)rsdp;
map_addr(rsdp_desc->RsdtAddress, rsdp_desc->RsdtAddress, FLAG_PRESENT);
struct ACPI_header* rsdt = (struct ACPI_header*)kalloc(sizeof(struct ACPI_header));
memcpy(rsdt, (uint64_t*)(uint64_t)rsdp_desc->RsdtAddress, sizeof(struct ACPI_header));
uint32_t entries = (rsdt->Length - (uint32_t)sizeof(struct ACPI_header)) / 4;
for (size_t i = 0; i < entries; i++) {
uint32_t na_addr = (uint32_t)rsdp_desc->RsdtAddress + (uint32_t)sizeof(struct ACPI_header) + (uint32_t)i * 4;
uint32_t addr;
memcpy(&addr, (uint64_t*)(uint64_t)na_addr, 4);
struct ACPI_header* t = (struct ACPI_header*)kalloc(sizeof(struct ACPI_header));
memcpy(t, (uint64_t*)(uint64_t)addr, sizeof(struct ACPI_header));
int ind = 1;
for (size_t j = 0; j < 4; j++) {
if (t->Signature[j] != signature[j])
ind = 0;
}
if (ind) {
kfree(t);
kfree(rsdt);
return (uint64_t*)(uint64_t)addr;
}
kfree(t);
}
kfree(rsdt);
return NULL;
}
|
