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/usrspace.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/usrspace.s')
| -rw-r--r-- | kernel/usrspace.s | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/usrspace.s b/kernel/usrspace.s index e52f2e0..1d20f71 100644 --- a/kernel/usrspace.s +++ b/kernel/usrspace.s @@ -1,6 +1,7 @@ global userspace_init -extern _binary_usrbin_bin_start extern _binary_usrbin_bin_size +extern _binary_usrbin_bin_start +extern tss userspace_init: push ebp @@ -32,8 +33,10 @@ usrcall: mov fs, ax mov gs, ax mov eax, esp + ; save ESP in the TSS + mov [tss+4], eax push dword 0x23 - push eax + push dword 0x00180000 pushf push dword 0x1B push dword 0x00100000 |