diff options
Diffstat (limited to 'kernel/drivers')
| -rw-r--r-- | kernel/drivers/acpi.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/drivers/acpi.c b/kernel/drivers/acpi.c index 02f3718..f7f643c 100644 --- a/kernel/drivers/acpi.c +++ b/kernel/drivers/acpi.c @@ -44,6 +44,19 @@ struct rsdp *find_rsdp() return NULL; } +void *find_sdt(struct rsdt *rsdt, const char *signature) +{ + int entries = (rsdt->header.length - sizeof(rsdt->header)) / 4; + + for (int i = 0; i < entries; i++) { + struct sdt_header *header = (struct sdt_header *)rsdt->sdt_pointer[i]; + if (memcmp(header->signature, signature, 4) == 0) + return header; + } + + return NULL; +} + void acpi_install() { struct rsdp *rsdp = find_rsdp(); @@ -51,4 +64,10 @@ void acpi_install() struct rsdt *rsdt = rsdp->rsdt; assert(rsdt && memcmp(rsdt->header.signature, RSDT_MAGIC, 4) == 0 && check_sdt(&rsdt->header)); + + madt = find_sdt(rsdt, MADT_MAGIC); + fadt = find_sdt(rsdt, FADT_MAGIC); + hpet = find_sdt(rsdt, HPET_MAGIC); + assert(madt && check_sdt(&madt->header) && fadt && check_sdt(&fadt->header) && hpet && + check_sdt(&hpet->header)); } |