Add a WIP VMM

As of now the VMM (pretty much a doubly linked list of regions) supports allocating and demand paging. still no deallocation though so if you allocate something you can't free it yet :')

src/include/kernel/vmm.h

@@ -0,0 +1,59 @@
+#ifndef _VMM_H_INCLUDE
+#define _VMM_H_INCLUDE
+
+#include <arch/mmu.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+#define KERNEL_SPACE_START 0xFFFF800000000000
+#define KERNEL_SPACE_END   0xFFFFFFFFFFFFFFFF
+
+#define VMM_TYPE_FREE 0
+#define VMM_TYPE_ANON 1
+#define VMM_TYPE_FILE 2
+
+struct vmm_cacheheader;
+
+typedef struct{
+	int lock;
+	struct vmm_cacheheader* next;
+	size_t freecount;
+} vmm_cacheheader;
+
+struct vmm_mapping;
+
+typedef struct _vmm_mapping {
+	struct _vmm_mapping *next;
+	struct _vmm_mapping *prev;
+	vmm_cacheheader* cache;
+	void* start;
+	void* end;
+	size_t mmuflags;
+	size_t type;
+	void*  data;
+	size_t offset;
+} vmm_mapping;
+
+
+#define VMM_CACHE_ENTRY_COUNT ((PAGE_SIZE - sizeof(vmm_cacheheader)) / sizeof(vmm_mapping))
+
+typedef struct{
+	vmm_cacheheader header;
+	vmm_mapping mappings[VMM_CACHE_ENTRY_COUNT];
+} vmm_cache;
+
+typedef struct {
+	vmm_mapping* userstart;
+	arch_mmu_tableptr context;
+	int lock;
+} vmm_context;
+
+void vmm_init();
+
+bool 		vmm_dealwithrequest(void* addr);
+bool 		vmm_setused(void* addr, size_t pagec, size_t mmuflags);
+bool		vmm_unmap(void* addr, size_t pagec);
+bool		vmm_map(void* paddr, void* vaddr, size_t pagec, size_t mmuflags);
+void*		vmm_alloc(size_t pagec, size_t mmuflags);
+
+#endif