Integrate uACPI & remove own ACPI parsing code

This commit adds uACPI as a submodule and removes all handwritten table
parsing code as well as struct definitions, since they now work via
uACPI. There's also now an ability to shut down by using the power
button.

kernel-src/include/x86-64/arch/acpi.h

@@ -1,92 +1,8 @@
-#ifndef _ACPI_H
-#define _ACPI_H
+#ifndef _ARCH_ACPI_H
+#define _ARCH_ACPI_H
 
-#include <stddef.h>
 #include <stdint.h>
-#include <stdbool.h>
 
-typedef struct {
-	char sig[8];
-	uint8_t checksum;
-	char oem[6];
-	uint8_t revision;
-	uint32_t rsdt;
-	uint32_t length;
-	uint64_t xsdt;
-	uint8_t xchecksum;
-	uint8_t reserved[3];
-} __attribute__((packed)) rsdp_t;
-
-typedef struct {
-	char sig[4];
-	uint32_t length;
-	uint8_t revision;
-	uint8_t cechksum;
-	char oemid[6];
-	char oemtableid[8];
-	uint32_t oemrevision;
-	uint32_t creatorid;
-	uint32_t creatorrevision;
-} __attribute__((packed)) sdtheader_t;
-
-typedef struct {
-	sdtheader_t header;
-	uint64_t tables[];
-} __attribute__((packed)) xsdt_t;
-
-typedef struct {
-	sdtheader_t header;
-	uint32_t tables[];
-} __attribute__((packed)) rsdt_t;
-
-typedef struct {
-	sdtheader_t header;
-	uint32_t addr;
-	uint32_t flags;
-} __attribute__((packed)) madt_t;
-
-typedef struct {
-	sdtheader_t header;
-	uint8_t hwrev;
-	uint8_t comparatorcount:5;
-	uint8_t countersize:1;
-	uint8_t reserved:1;
-	uint8_t legacy_replacement:1;
-	uint16_t pcivendor;
-	uint8_t addrid;
-	uint8_t bitwidth;
-	uint8_t bitoffset;
-	uint8_t reserved2;
-	uint64_t addr;
-	uint8_t hpetnum;
-	uint16_t mintick;
-	uint8_t pageprot;
-} __attribute__((packed)) hpet_t;
-
-typedef struct {
-	uint64_t address;
-	uint16_t sgn;
-	uint8_t startbus;
-	uint8_t endbus;
-	uint32_t reserved;
-} __attribute__((packed)) mcfgentry_t;
-
-typedef struct {
-	sdtheader_t header;
-	uint64_t reserved;
-	mcfgentry_t entries[];
-} __attribute__((packed)) mcfg_t;
-
-#define ACPI_MADT_TYPE_LAPIC 0
-#define ACPI_MADT_TYPE_IOAPIC 1
-#define ACPI_MADT_TYPE_OVERRIDE 2
-#define ACPI_MADT_TYPE_IONMI 3
-#define ACPI_MADT_TYPE_LANMI 4
-#define ACPI_MADT_TYPE_64BITADDR 5
-#define ACPI_MADT_TYPE_X2APIC 9
-
-bool arch_acpi_checksumok(void *table);
-void *arch_acpi_findtable(char *sig, int n);
-void arch_acpi_init();
+uintptr_t arch_get_rsdp(void);
 
 #endif