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acpi: Implement UEFI version of acpi_get_rsdp()

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This commit is contained in:
mintsuki 2021-03-07 03:57:18 +01:00
parent d96bdf775b
commit 4e55d28777
1 changed files with 30 additions and 1 deletions
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31
stage23/lib/acpi.c
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@ -6,7 +6,7 @@
#include <lib/libc.h>
#include <lib/print.h>
// Following function based on https://github.com/qword-os/lai/blob/master/helpers/pc-bios.c's function lai_bios_calc_checksum()
// Following function based on https://github.com/managarm/lai/blob/master/helpers/pc-bios.c's function lai_bios_calc_checksum()
uint8_t acpi_checksum(void *ptr, size_t size) {
uint8_t sum = 0, *_ptr = ptr;
for (size_t i = 0; i < size; i++)
@ -14,6 +14,8 @@ uint8_t acpi_checksum(void *ptr, size_t size) {
return sum;
}
#if defined (bios)
void *acpi_get_rsdp(void) {
size_t ebda = EBDA;
@ -32,6 +34,33 @@ void *acpi_get_rsdp(void) {
return NULL;
}
#endif
#if defined (uefi)
#include <efi.h>
void *acpi_get_rsdp(void) {
for (size_t i = 0; i < gST->NumberOfTableEntries; i++) {
EFI_CONFIGURATION_TABLE *cur_table = &gST->ConfigurationTable[i];
EFI_GUID acpi_2_guid = ACPI_20_TABLE_GUID;
if (memcmp(&cur_table->VendorGuid, &acpi_2_guid, sizeof(EFI_GUID)) != 0)
continue;
if (acpi_checksum(cur_table->VendorTable, sizeof(struct rsdp)) != 0)
continue;
print("acpi: Found RSDP at %X\n", cur_table->VendorTable);
return (void *)cur_table->VendorTable;
}
return NULL;
}
#endif
void *acpi_get_table(const char *signature, int index) {
int cnt = 0;