src/vmm.h


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#include <stdlib.h>

#pragma once

extern "C" void dump_address();

struct page_table {
  uint32_t* addr;
};

class vmm {
public:
  vmm(uint32_t* addr = nullptr);

  constexpr static size_t table_id(uint32_t offset) {
    offset &= 0xfff00000;
    offset /= (4 * 1024 * 1024);
    return static_cast<size_t>(offset);
  }
  constexpr static size_t page_id(uint32_t offset) { return static_cast<size_t>(offset / 4096); }

  uint32_t map(uint32_t phys_addr, uint32_t offset);

private:
  uint32_t* directory;
};

static_assert(vmm::table_id(0x00001234) == 0);
static_assert(vmm::table_id(0x00400000) == 1);
static_assert(vmm::table_id(0xc0000000) == 768);
static_assert(vmm::table_id(0xc03ff000) == 768);