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Re:IRQ stop after multi-tasking
Posted: Sat Oct 01, 2005 6:09 pm
by GLneo
this is my stack struct:
Code: Select all
typedef struct stack_data
{
unsigned int gs;
unsigned int fs;
unsigned int es;
unsigned int ds;
unsigned int edi;
unsigned int esi;
unsigned int ebp;
unsigned int esp;
unsigned int ebx;
unsigned int edx;
unsigned int ecx;
unsigned int eax;
unsigned int eip;
unsigned int cs;
unsigned int eflags;
}stack_data_t;
and this is my push and pop:
Code: Select all
_task_timer:
pushad
push ds
push es
push fs
push gs
mov ax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
; cli
push esp
mov eax, _task_timer_c
call eax
; sti
pop esp
mov esp, eax
pop gs
pop fs
pop es
pop ds
popad
iret
Re:IRQ stop after multi-tasking
Posted: Sat Oct 01, 2005 7:33 pm
by Cjmovie
Code: Select all
_task_timer:
pushad
push ds
push es
push fs
push gs
mov ax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
; cli
push esp
mov eax, _task_timer_c
call eax
; sti
pop esp
mov esp, eax
pop gs
pop fs
pop es
pop ds
popad
iret
Either I'm an idiot, or you're putting the address of _task_timer_c into esp....
Re:IRQ stop after multi-tasking
Posted: Sat Oct 01, 2005 7:57 pm
by GLneo
it looks that way but gcc should return value in EAX...hopefully
Re:IRQ stop after multi-tasking
Posted: Sun Oct 02, 2005 12:10 am
by Colonel Kernel
Cjmovie wrote:Either I'm an idiot, or you're putting the address of _task_timer_c into esp....
For those who missed the other thread... _task_timer_c returns the address of the stack to switch to, or the address of the current stack if no task switch should occur.
Re:IRQ stop after multi-tasking
Posted: Sun Oct 02, 2005 7:47 am
by GLneo
but how do i know it ends up in eax, is there a switch i can use???
Re:IRQ stop after multi-tasking
Posted: Sun Oct 02, 2005 8:03 am
by AR
GCC uses EAX as the return value, it's part of the calling convention.
Re:IRQ stop after multi-tasking
Posted: Mon Oct 03, 2005 5:54 am
by GLneo
well, like i sayed i can switch a few times like this:
so i know it is not my switcher, and even when i do a test that prints sup and EOI and ret it stops after one???
ok here is the entier test:
Code: Select all
void tester()
{
puts("sup");
outport(0x20, 0x20);
}
Code: Select all
set_a_idt(32, (unsigned)tester, 0x08, 0x8E);
Code: Select all
void set_a_idt(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags)
{
idt[num].base_lo = (base & 0xFFFF);
idt[num].base_hi = (base >> 16) & 0xFFFF;
idt[num].sel = sel;
idt[num].always0 = 0;
idt[num].flags = flags;
}
and that only works once, i know my IDT's are good
p.s. does the cpu push any values after a IRQ that could corupt my stack???
Re:IRQ stop after multi-tasking
Posted: Mon Oct 03, 2005 6:17 am
by AR
Try printing the hex value of EFLAGS in the ISR, look for 0x200 being off (Interrupts). What code does the CPU wait on, is there a CLI there?