41 lines
967 B
C
41 lines
967 B
C
#include <kernel/acpi.h>
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#include <kernel/kernel.h>
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rsdp_t *acpi_find_rsdp() {
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char *ptr = (char *)(KERNEL_VMA + BIOS_START);
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const char sig[RSDP_SIG_LEN] = RSDP_SIG;
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for (; (uint32_t)ptr - KERNEL_VMA <= BIOS_END; ptr += 16) {
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int i = 0;
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for (; i < RSDP_SIG_LEN; i++)
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if (ptr[i] != sig[i]) break;
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if (i == RSDP_SIG_LEN) return (rsdp_t *)ptr;
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}
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return 0;
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}
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uint8_t acpi_checksum(void *s, int size) {
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uint32_t sum = 0;
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for (int i = 0; i < size; i++) {
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sum += ((uint8_t *)s)[i];
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}
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return (sum & 0xFF) == 0;
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}
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void *acpi_find_sdt(rsdt_t *rsdt, const char *sig) {
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int entries = (rsdt->hdr.Length - sizeof(sdt_hdr_t)) / 4;
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for (int i = 0; i < entries; i++) {
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const char *ptr = (const char *)rsdt->other_tables[i];
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int j = 0;
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for (; j < 4; j++)
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if (ptr[j] != sig[j]) break;
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if (j == 4) return (void *)ptr;
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}
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return 0;
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}
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