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https://github.com/Mathewnd/Astral.git
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Matheus
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
#ifndef _VMM_H
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#define _VMM_H
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#include <arch/mmu.h>
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#include <spinlock.h>
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#include <kernel/vfs.h>
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#define VMM_FLAGS_PAGESIZE 1
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#define VMM_FLAGS_ALLOCATE 2
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#define VMM_FLAGS_PHYSICAL 4
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#define VMM_FLAGS_FILE 8
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#define VMM_FLAGS_EXACT 16
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#define VMM_FLAGS_SHARED 32
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#define VMM_FLAGS_COPY 64
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#define VMM_PERMANENT_FLAGS_MASK (VMM_FLAGS_FILE | VMM_FLAGS_SHARED | VMM_FLAGS_COPY)
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#define VMM_ACTION_READ 1
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#define VMM_ACTION_WRITE 2
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#define VMM_ACTION_EXEC 4
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typedef struct {
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vnode_t *node;
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uintmax_t offset;
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} vmmfiledesc_t;
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struct vmmcache_t;
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typedef struct vmmrange_t{
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struct vmmrange_t *next;
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struct vmmrange_t *prev;
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void *start;
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size_t size;
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int flags;
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mmuflags_t mmuflags;
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union {
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struct {
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vnode_t *vnode;
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size_t offset;
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};
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};
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} vmmrange_t;
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typedef struct {
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spinlock_t lock;
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struct vmmcache_t *next;
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size_t freecount;
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uintmax_t firstfree;
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} vmmcacheheader_t;
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#define VMM_RANGES_PER_CACHE (PAGE_SIZE - sizeof(vmmcacheheader_t)) / sizeof(vmmrange_t)
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typedef struct vmmcache_t {
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vmmcacheheader_t header;
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vmmrange_t ranges[VMM_RANGES_PER_CACHE];
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} vmmcache_t;
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typedef struct {
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spinlock_t lock;
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vmmrange_t *ranges;
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void *start;
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void *end;
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} vmmspace_t;
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typedef struct {
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vmmspace_t space;
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pagetableptr_t pagetable;
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} vmmcontext_t;
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extern vmmcontext_t vmm_kernelctx;
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static inline mmuflags_t vnodeflagstommuflags(int flags) {
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mmuflags_t mmuflags = ARCH_MMU_FLAGS_USER;
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if (flags & V_FFLAGS_READ)
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mmuflags |= ARCH_MMU_FLAGS_READ;
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if (flags & V_FFLAGS_WRITE)
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mmuflags |= ARCH_MMU_FLAGS_WRITE;
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if ((flags & V_FFLAGS_EXEC) == 0)
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mmuflags |= ARCH_MMU_FLAGS_NOEXEC;
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return mmuflags;
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}
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static inline int mmuflagstovnodeflags(mmuflags_t mmuflags) {
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int flags = 0;
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if (mmuflags & ARCH_MMU_FLAGS_READ)
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flags |= V_FFLAGS_READ;
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if (mmuflags & ARCH_MMU_FLAGS_WRITE)
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flags |= V_FFLAGS_READ;
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if ((mmuflags & ARCH_MMU_FLAGS_NOEXEC) == 0)
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flags |= V_FFLAGS_EXEC;
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return flags;
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}
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void *vmm_map(void *addr, size_t size, int flags, mmuflags_t mmuflags, void *private);
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void vmm_unmap(void *addr, size_t size, int flags);
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bool vmm_pagefault(void *addr, bool user, int actions);
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vmmcontext_t *vmm_newcontext();
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void vmm_switchcontext(vmmcontext_t *ctx);
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void vmm_init();
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#endif
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