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| 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/timer.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/timer.s')
| -rw-r--r-- | kernel/timer.s | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/timer.s b/kernel/timer.s index de01ea6..53c81ed 100644 --- a/kernel/timer.s +++ b/kernel/timer.s @@ -17,9 +17,10 @@ timer_init: mov ebp, esp ; register the tick_handler push tick_handler + push dword 0 push dword 0x20 call register_isr - add esp, 8 + add esp, 12 ; initialize the pit mov ax, 0x36 out 0x43, al |