34 lines
967 B
C
34 lines
967 B
C
#pragma once
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#define STA_X 0x8 // Executable segment
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#define STA_W 0x2 // Writeable (non-executable segments)
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#define STA_R 0x2 // Readable (executable segments)
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// System segment type bits
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#define STS_T32A 0x9 // Available 32-bit TSS
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#define STS_IG32 0xE // 32-bit Interrupt Gate
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#define STS_TG32 0xF // 32-bit Trap Gate
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#define DPL_USER 3
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#define FL_IF 0x00000200
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#define SEG_KCODE 1
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#define SEG_KDATA 2
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#define SEG_UCODE 3
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#define SEG_UDATA 4
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#define SEG_TSS 5
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#define SEG_ASM(type,base,lim) \
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.word (((lim) >> 12) & 0xffff), ((base) & 0xffff); \
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.byte (((base) >> 16) & 0xff), (0x90 | (type)), \
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(0xC0 | (((lim) >> 28) & 0xf)), (((base) >> 24) & 0xff)
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#define USER_BASE 0x400000 // 4 MB
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#define USER_STACK_BASE 0xf00000 // 15 MB
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#define KERN_STACK_BASE 0x90000
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#ifndef __ASSEMBLER__
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void load_gdt();
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#endif
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