kaguya
e6e8b1209b
Finally we got usermode working again, It took awhile but we got it done. A few things we did in this commit: - Simplified GDT entry initialization in gdt.c for kernel and user segments. - Fixed TSS structure for task switching. - Implemented cr2 handling in a page fault. - Enhanced user stack setup in usermode.c to return the correct RSP. - Improved syscall implementation in syscall.c, including new syscall numbers. - Updated syscall entry to correctly handle context switching and argument passing. - Refactored init.c to demonstrate file operations using syscalls. - Added new syscalls for file operations in syscalls.h. - Modified VFS to handle leading slashes in paths correctly. Signed-off-by: kaguya <vpshinomiya@protonmail.com>
19 lines
308 B
C
19 lines
308 B
C
#pragma once
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#define SYS_READ 0
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#define SYS_WRITE 1
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#define SYS_OPEN 2
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#define SYS_CLOSE 3
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static inline long syscall(long num, long a1, long a2, long a3)
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{
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long ret;
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asm volatile (
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"syscall"
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: "=a"(ret)
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: "a"(num), "D"(a1), "S"(a2), "d"(a3)
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);
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return ret;
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} |