mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-10 13:00:29 +03:00
1c6f8d3cbd
It was really confusing to have different calling conventions in kernel and userspace. Also this has prevented us from linking with libgcc.
87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#include <Kernel/Arch/i386/CPU.h>
|
|
#include <Kernel/Arch/i386/PIC.h>
|
|
#include <Kernel/Arch/i386/PIT.h>
|
|
#include <Kernel/IO.h>
|
|
#include <Kernel/Scheduler.h>
|
|
|
|
#define IRQ_TIMER 0
|
|
|
|
extern "C" void timer_interrupt_entry();
|
|
extern "C" void timer_interrupt_handler(RegisterDump&);
|
|
|
|
asm(
|
|
".globl timer_interrupt_entry \n"
|
|
"timer_interrupt_entry: \n"
|
|
" pushl $0x0\n"
|
|
" pusha\n"
|
|
" pushw %ds\n"
|
|
" pushw %es\n"
|
|
" pushw %fs\n"
|
|
" pushw %gs\n"
|
|
" pushw %ss\n"
|
|
" pushw %ss\n"
|
|
" pushw %ss\n"
|
|
" pushw %ss\n"
|
|
" pushw %ss\n"
|
|
" popw %ds\n"
|
|
" popw %es\n"
|
|
" popw %fs\n"
|
|
" popw %gs\n"
|
|
" pushl %esp\n"
|
|
" call timer_interrupt_handler\n"
|
|
" add $4, %esp\n"
|
|
" popw %gs\n"
|
|
" popw %gs\n"
|
|
" popw %fs\n"
|
|
" popw %es\n"
|
|
" popw %ds\n"
|
|
" popa\n"
|
|
" add $0x4, %esp\n"
|
|
" iret\n");
|
|
|
|
static u32 s_ticks_this_second;
|
|
static u32 s_seconds_since_boot;
|
|
|
|
void timer_interrupt_handler(RegisterDump& regs)
|
|
{
|
|
IRQHandlerScope scope(IRQ_TIMER);
|
|
if (++s_ticks_this_second >= TICKS_PER_SECOND) {
|
|
// FIXME: Synchronize with the RTC somehow to prevent drifting apart.
|
|
++s_seconds_since_boot;
|
|
s_ticks_this_second = 0;
|
|
}
|
|
Scheduler::timer_tick(regs);
|
|
}
|
|
|
|
namespace PIT {
|
|
|
|
u32 ticks_this_second()
|
|
{
|
|
return s_ticks_this_second;
|
|
}
|
|
|
|
u32 seconds_since_boot()
|
|
{
|
|
return s_seconds_since_boot;
|
|
}
|
|
|
|
void initialize()
|
|
{
|
|
u16 timer_reload;
|
|
|
|
IO::out8(PIT_CTL, TIMER0_SELECT | WRITE_WORD | MODE_SQUARE_WAVE);
|
|
|
|
timer_reload = (BASE_FREQUENCY / TICKS_PER_SECOND);
|
|
|
|
kprintf("PIT: %u Hz, square wave (%x)\n", TICKS_PER_SECOND, timer_reload);
|
|
|
|
IO::out8(TIMER0_CTL, LSB(timer_reload));
|
|
IO::out8(TIMER0_CTL, MSB(timer_reload));
|
|
|
|
register_interrupt_handler(IRQ_VECTOR_BASE + IRQ_TIMER, timer_interrupt_entry);
|
|
|
|
PIC::enable(IRQ_TIMER);
|
|
}
|
|
|
|
}
|