38 lines
1.1 KiB
C
38 lines
1.1 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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extern uint32_t _kernel_end;
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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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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_frames(size_t size);
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int free_frames(void *frame_ptr, size_t size);
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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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