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

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

@@ -7,12 +7,14 @@
 #include <arch/msr.h>
 #include <arch/ist.h>
 #include <kernel/interrupt.h>
+#include <kernel/vmm.h>
 
 typedef struct {
 	uint64_t gdt[7];
 	ist_t ist;
 	long id;
 	isr_t isr[MAX_ISR_COUNT];
+	vmmcontext_t *vmmctx;
 } cpu_t;
 
 static inline cpu_t *_cpu() {

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

@@ -5,6 +5,11 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#define KERNELSPACE_START (void *)0xffff800000000000
+#define KERNELSPACE_END   (void *)0xffffffffffffffff
+#define USERSPACE_START   (void *)0x0000000000001000
+#define USERSPACE_END     (void *)0x00007fffffffffff
+
 #define PAGE_SIZE 4096
 #define ARCH_MMU_FLAG_READ (uint64_t)1
 #define ARCH_MMU_FLAG_WRITE (uint64_t)2
@@ -20,6 +25,7 @@ void arch_mmu_unmap(pagetableptr_t table, void *vaddr);
 void arch_mmu_remap(pagetableptr_t table, void *paddr, void *vaddr, mmuflags_t flags);
 void arch_mmu_switch(pagetableptr_t table);
 void *arch_mmu_getphysical(pagetableptr_t table, void *vaddr);
+pagetableptr_t arch_mmu_newtable();
 void arch_mmu_init();
 
 #endif