diff options
| author | Jake Mannens <jake72360@gmail.com> | 2018-06-23 08:28:19 +1000 |
|---|---|---|
| committer | Jake Mannens <jake72360@gmail.com> | 2018-06-23 08:28:19 +1000 |
| commit | 2c429f6e1ac51ea27f203005eeef20d2b05c759e (patch) | |
| tree | 5d9ba6851e87876a97a4780905a3248af165f33e /kernel/usrbin/usrbin.s | |
| parent | ce9932308abed8000f9f6e06a61f726b29aa9e3a (diff) | |
Re-wrote interrupt handling. Now, flush_idt only initializes IDT entries
32-255. A separate routine in the new file traps.s initializes the first
32 entries with addresses pointing to exception handlers within said
file.
Modified the register_isr function to now accept a descriptor privilege
level which it will assign to the modified IDT entry.
Added a task state segment and corresponding entry to the GDT. The TSS
will store the kernel's stack pointer and stack segment when switching
to userspace. NOTE: The stack pointer MUST be saved manually before
switching to userspace!
Added the framework for a system call interface at interrupt vector 0x80
(128).
Diffstat (limited to 'kernel/usrbin/usrbin.s')
| -rw-r--r-- | kernel/usrbin/usrbin.s | 26 |
1 files changed, 3 insertions, 23 deletions
diff --git a/kernel/usrbin/usrbin.s b/kernel/usrbin/usrbin.s index 91dd94a..248d823 100644 --- a/kernel/usrbin/usrbin.s +++ b/kernel/usrbin/usrbin.s @@ -3,30 +3,10 @@ org 0x100000 main: push .msg - call puts + push byte 0 + int 0x80 add esp, 4 .loop: ; loop forever jmp .loop -.msg: db "Hello World from Userspace!", 0 - -puts: - push ebp - mov ebp, esp - push esi - push edi - mov esi, [ebp+8] - mov edi, 0xB8000 -.loop: - lodsb - cmp al, 0 - je .end - mov [edi], al - mov byte [edi+1], 0x07 - add edi, 2 - jmp .loop -.end: - pop edi - pop esi - pop ebp - ret +.msg: db "Hello World from Userspace, using syscalls!", 10, 0 |