64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
#pragma once
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#include "multiboot.h"
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#include "types.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 ((u32) & _kernel_end - HEAP_END)
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#define KERNEL_START ((u32) & _kernel_start)
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#define KERNEL_END ((u32) & _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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((((u32)pd_index * 1024) + (u32)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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u32 first_free_frame;
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u8 *frame_table;
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u32 total_frames;
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u32 remaining_frames;
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struct frame_zone *next;
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};
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extern u32 _kernel_end;
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extern u32 _kernel_start;
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extern u32 boot_page_directory;
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extern u32 *page_directory;
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extern u32 page_table_default[1024];
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extern u32 mem_size;
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extern multiboot_memory_map_t *mmap_addr;
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extern multiboot_u32 mmap_length;
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extern struct frame_zone *head;
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u32 *virt_to_phys(u32 *virt_addr);
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void init_memory(multiboot_info_t *mbd, u32 magic);
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void *alloc_frame(void);
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int free_frame(void *frame_ptr);
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i8 add_single_page(void *frame);
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void *alloc_pages(size_t size, void **phys_addr);
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int free_pages(void *page_ptr, size_t size);
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void init_page_table(u32 page_table[1024], u16 start);
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int16_t add_page_table(u16 pd_index);
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