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#ifndef _VMM_H_
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#define _VMM_H_
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#include "riscv.h"
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#include "process.h"
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/* --- utility functions for virtual address mapping --- */
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int map_pages(pagetable_t pagetable, uint64 va, uint64 size, uint64 pa, int perm);
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// permission codes.
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enum VMPermision {
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PROT_NONE = 0,
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PROT_READ = 1,
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PROT_WRITE = 2,
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PROT_EXEC = 4,
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};
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uint64 prot_to_type(int prot, int user);
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pte_t *page_walk(pagetable_t pagetable, uint64 va, int alloc);
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uint64 lookup_pa(pagetable_t pagetable, uint64 va);
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/* --- kernel page table --- */
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// pointer to kernel page directory
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extern pagetable_t g_kernel_pagetable;
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void kern_vm_map(pagetable_t page_dir, uint64 va, uint64 pa, uint64 sz, int perm);
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// Initialize the kernel pagetable
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void kern_vm_init(void);
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/* --- user page table --- */
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void *user_va_to_pa(pagetable_t page_dir, void *va);
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void user_vm_map(pagetable_t page_dir, uint64 va, uint64 size, uint64 pa, int perm);
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void user_vm_unmap(pagetable_t page_dir, uint64 va, uint64 size, int free);
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void print_proc_vmspace(process* proc);
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#endif
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