57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
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#ifndef MM_H
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#define MM_H MM_H
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#include "hos_types.h"
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#include "hos_defines.h"
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#include "multiboot.h"
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#define KERNEL_CODE_SEGMENT 0x08
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#define KERNEL_DATA_SEGMENT 0x10
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typedef u32_t pagedirectory_entry_t;
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#define NUM_PAGETABLE_ENTRIES (PAGE_SIZE / sizeof(pagedirectory_entry_t))
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typedef pagedirectory_entry_t pagedirectory_t[NUM_PAGETABLE_ENTRIES];
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typedef struct
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{
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u64_t base;
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u64_t length;
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} mm_mem_range_t;
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void mm_record_mmap_entry(mb_mmap_t * mmap);
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void mm_bootstrap();
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int mm_early_map(u32_t virtual_address, u32_t physical_address,
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u32_t user_mode, u32_t writable);
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int mm_map(u32_t virtual_address, u32_t physical_address,
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u32_t user_mode, u32_t writable);
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u32_t mm_early_page_alloc();
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u32_t mm_page_alloc();
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/* http://courses.ece.illinois.edu/ece391/references/descriptors.pdf */
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/* granularity: 0: limit in bytes; 1: limit in pages */
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/* dpl: 0: system mode; 3: user mode */
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/* normal: 0: TSS/LDT/call gate; 1: code/data segment */
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/* code_seg: 0: data segment; 1: code segment */
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#define MAKE_DESCRIPTOR(base, limit, granularity, dpl, normal, code_seg) \
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(u64_t) ( ( (((u64_t) base) & 0xFF000000ull) << 32 ) /* base 31:24 */ \
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| ( (((u64_t) granularity) & 0x1ull) << 55 ) /* granularity */ \
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| ( ( (u64_t) 0x1ull) << 54 ) /* 32-bit */ \
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| ( (((u64_t) limit) & 0xF0000ull) << 32 ) /* limit 19:16 */ \
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| ( ( (u64_t) 0x1ull) << 47 ) /* present */ \
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| ( (((u64_t) dpl) & 0x3ull) << 45 ) /* dpl */ \
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| ( (((u64_t) normal) & 0x1ull) << 44 ) /* normal */ \
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| ( (((u64_t) code_seg) & 0x1ull) << 43 ) /* code seg */ \
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| ( ( (u64_t) 0x2ull) << 40 ) /* ? */ \
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| ( (((u64_t) base) & 0x00FFFFFFull) << 16) /* base 23:00 */ \
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| ( (((u64_t) limit) & 0x0000FFFFull) ) ) /* limit 15:00 */
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void mm_print_memory_map();
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#endif
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