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