kernel: initial vmm implementation

kernel-src/include/kernel/vmm.h

@@ -0,0 +1,57 @@
+#ifndef _VMM_H
+#define _VMM_H
+
+#include <arch/mmu.h>
+
+#define VMM_FLAGS_PAGESIZE 1
+#define VMM_FLAGS_ALLOCATE 2
+#define VMM_FLAGS_PHYSICAL 4
+#define VMM_FLAGS_FILE     8
+#define VMM_FLAGS_EXACT   16
+#define VMM_FLAGS_SHARED  32
+#define VMM_FLAGS_COPY    64
+
+#define VMM_PERMANENT_FLAGS_MASK (VMM_FLAGS_FILE | VMM_FLAGS_SHARED | VMM_FLAGS_COPY)
+
+struct vmmcache_t;
+typedef struct vmmrange_t{
+	struct vmmrange_t *next;
+	struct vmmrange_t *prev;
+	void *start;
+	size_t size;
+	int flags;
+	mmuflags_t mmuflags;
+	void *private;
+} vmmrange_t;
+
+typedef struct {
+	// TODO lock
+	struct vmmcache_t *next;
+	size_t freecount;
+	uintmax_t firstfree;
+} vmmcacheheader_t;
+
+#define VMM_RANGES_PER_CACHE (PAGE_SIZE - sizeof(vmmcacheheader_t)) / sizeof(vmmrange_t)
+
+typedef struct vmmcache_t {
+	vmmcacheheader_t header;
+	vmmrange_t ranges[VMM_RANGES_PER_CACHE];
+} vmmcache_t;
+
+typedef struct {
+	vmmrange_t *ranges;
+	void *start;
+	void *end;
+} vmmspace_t;
+
+typedef struct {
+	vmmspace_t space;
+	pagetableptr_t pagetable;
+} vmmcontext_t;
+
+void *vmm_map(void *addr, size_t size, int flags, mmuflags_t mmuflags, void *private);
+void vmm_unmap(void *addr, size_t size, int flags);
+vmmcontext_t *vmm_newcontext();
+void vmm_init();
+
+#endif