mmu.hh

#ifndef MMU_HH
#define MMU_HH

#include "fs/fs.hh"
#include <stdint.h>
#include <boost/intrusive/set.hpp>
#include <types.hh>

namespace mmu {
    typedef uint64_t f_offset;

    enum {
	perm_read = 1,
	perm_write = 2,
	perm_exec = 4,
	perm_rx = perm_read | perm_exec,
	perm_rw = perm_read | perm_write,
	perm_rwx = perm_read | perm_write | perm_exec,
    };

    class vma {
    public:
	vma(uintptr_t start, uintptr_t end);
	uintptr_t start() const;
	uintptr_t end() const;
	void* addr() const;
	uintptr_t size() const;
	void split(uintptr_t edge);
    private:
	uintptr_t _start;
	uintptr_t _end;
    public:
	boost::intrusive::set_member_hook<> _vma_list_hook;
    };

    vma* reserve(void* hint, size_t size);
    vma* map_file(void* addr, size_t size, unsigned perm,
                  file& file, f_offset offset);
    vma* map_anon(void* addr, size_t size, unsigned perm);
    void unmap(void* addr, size_t size);

    typedef uint64_t phys;
    phys virt_to_phys(void *virt);

    void linear_map(uintptr_t virt, phys addr, size_t size, size_t slop);
    void free_initial_memory_range(uintptr_t addr, size_t size);
    void switch_to_runtime_page_table();
}

#endif