51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#include <ddk.h>
|
|
#include <syscall.h>
|
|
#include "acpi.h"
|
|
|
|
extern acpi_rsdp_t* acpi_rsdp;
|
|
extern acpi_rsdt_t* acpi_rsdt;
|
|
|
|
addr_t acpi_ioapic;
|
|
addr_t acpi_local_apic;
|
|
|
|
u8_t __fastcall acpi_table_checksum(u32_t length, u8_t *buffer);
|
|
|
|
acpi_rsdp_t* acpi_locate()
|
|
{
|
|
/** @todo checksum, check version */
|
|
addr_t p;
|
|
|
|
for (p = ACPI_HI_RSDP_WINDOW_START; p < ACPI_HI_RSDP_WINDOW_END; p+=16)
|
|
{
|
|
acpi_rsdp_t* r = (acpi_rsdp_t*) p;
|
|
if ((r->sig[0] == 0x20445352) &&
|
|
(r->sig[1] == 0x20525450) &&
|
|
acpi_table_checksum(ACPI_RSDP_CHECKSUM_LENGTH, (u8_t*)r)==0 )
|
|
{
|
|
return r;
|
|
};
|
|
};
|
|
/* not found */
|
|
return NULL;
|
|
};
|
|
|
|
addr_t __fastcall rsdt_find(acpi_rsdt_t *rsdt, u32_t sig)
|
|
{
|
|
addr_t head = 0;
|
|
u32_t i;
|
|
|
|
for (i = 0; i < ((rsdt->header.len-sizeof(acpi_thead_t))/
|
|
sizeof(rsdt->ptrs[0])); i++)
|
|
{
|
|
acpi_thead_t* t= (acpi_thead_t*)acpi_remap_table(rsdt->ptrs[i]);
|
|
|
|
if (t->sig == sig)
|
|
{
|
|
head = rsdt->ptrs[i];
|
|
break;
|
|
};
|
|
}
|
|
return head;
|
|
};
|
|
|