Big code refactor, get rid of HAL entirely

kernel/vmm/vmm.h

@@ -0,0 +1,65 @@
+#ifndef VMM_VMM_H_
+#define VMM_VMM_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "compiler/attr.h"
+
+#define VMM_PAGE_SIZE 0x1000
+
+#define VIRT(X) ((void *)(BOOT_INFO.hhdm_off + (uint64_t)(X)))
+
+typedef struct VasRange {
+  struct VasRange *next;
+
+  uint8_t *virtstart;
+  uint8_t *physstart;
+  size_t size;
+  uint8_t pgflags;
+} PACKED VasRange;
+
+enum {
+  VMM_PG_PRESENT = 1<<0,
+  VMM_PG_RW      = 1<<1,
+  VMM_PG_USER    = 1<<2,
+};
+
+typedef struct {
+  uint16_t pml4;
+  uint16_t pml3;
+  uint16_t pml2;
+  uint16_t pml1;
+} PACKED PgIndex;
+
+typedef struct {
+  bool present: 1;
+  bool rw: 1;
+  bool user: 1;
+  bool writethrough: 1;
+  bool cachedisabled: 1;
+  bool accessed: 1;
+  bool dirty: 1;
+  bool hugepage: 1;
+  bool global: 1;
+  uint8_t avail: 3;
+  uint64_t addr: 40;
+  uint16_t osdef: 11;
+  bool nx: 1;
+} PACKED Pte;
+
+typedef struct {
+  Pte ents[512];
+} PACKED PgTable;
+
+extern uint64_t KERNEL_CR3;
+
+void vmm_init(void);
+void vmm_unmap_page(uint64_t cr3phys, uint64_t virtaddr);
+void vmm_map_page(uint64_t cr3phys, uint64_t virtaddr, uint64_t physaddr, uint32_t flags);
+uint64_t vmm_current_cr3(void);
+void vmm_map_range(uint64_t cr3phys, void *virtstart, void *physstart, size_t size, uint32_t flags);
+void vmm_unmap_range(uint64_t cr3phys, void *virtstart, void *physstart, size_t size);
+uint64_t vmm_userproc_pml4_phys(void);
+
+#endif // VMM_VMM_H_