60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
#pragma once
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#include "multiboot.h"
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#include <stddef.h>
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#include <stdint.h>
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#define PRESENT (1 << 0)
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#define RW (1 << 1)
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#define SUPERVISOR (0 << 2)
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#define ACCESSED (1 << 4)
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#define INIT_FLAGS (PRESENT | RW | SUPERVISOR)
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#define PAGE_SIZE 4096
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#define PT_SIZE 1024
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#define PD_SIZE 1024
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#define PAGE_MASK 0xFFFFF000
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#define HEAP_END 0xC0000000
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#define HEAP_START ((uint32_t) & _kernel_end - HEAP_END)
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#define PT_START 256
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#define GET_PAGE_ADDR(pd_index, pt_index) \
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((((uint32_t)pd_index * 1024) + (uint32_t)pt_index) * 4096)
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#define GET_FRAME(frame_table, i) (frame_table[i / 8] & (1 << (i % 8)))
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#define SET_FRAME(frame_table, i, used) \
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do { \
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if (used) \
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frame_table[i / 8] |= (1 << (i % 8)); \
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else \
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frame_table[i / 8] &= ~(1 << (i % 8)); \
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} while (0)
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struct frame_zone {
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void *addr;
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uint32_t first_free_frame;
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uint8_t *frame_table;
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uint32_t total_frames;
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uint32_t remaining_frames;
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struct frame_zone *next;
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};
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extern uint32_t _kernel_end;
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extern uint32_t _kernel_start;
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extern uint32_t boot_page_directory;
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extern uint32_t *page_directory;
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extern uint32_t page_table_default[1024];
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extern uint32_t mem_size;
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extern multiboot_memory_map_t *mmap_addr;
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extern multiboot_uint32_t mmap_length;
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extern struct frame_zone *head;
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uint32_t *virt_to_phys(uint32_t *virt_addr);
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void init_memory(multiboot_info_t *mbd, uint32_t magic);
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void *alloc_frame(void);
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int free_frame(void *frame_ptr);
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void *alloc_pages(size_t size);
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int free_pages(void *page_ptr, size_t size);
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void init_page_table(uint32_t page_table[1024], uint16_t start);
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int16_t add_page_table(uint16_t pd_index);
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