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ladybird/Kernel/i8253.cpp

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Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
#include "i8253.h"
#include "i386.h"
#include "IO.h"
#include "PIC.h"
Move the scheduler code to its own class. This is very mechanical.
2018-11-07 21:15:02 +00:00
#include "Scheduler.h"
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
#define IRQ_TIMER 0
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
extern "C" void timer_interrupt_entry();
extern "C" void timer_interrupt_handler(RegisterDump&);
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
asm(
Big, possibly complete sweep of naming changes.
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".globl timer_interrupt_entry \n"
"timer_interrupt_entry: \n"
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
" 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"
Lots of hacking: - Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard. - Implement MM::unmapRegionsForTask() and MM::unmapRegion() - Save SS correctly on interrupt. - Add a simple Spawn syscall for launching another process. - Move a bunch of IO syscall debug output behind DEBUG_IO. - Have ASSERT do a "cli" immediately when failing. This makes the output look proper every time. - Implement a bunch of syscalls in LibC. - Add a simple shell ("sh"). All it can do now is read a line of text from /dev/keyboard and then try launching the specified executable by calling spawn(). There are definitely bugs in here, but we're moving on forward.
2018-10-23 08:12:50 +00:00
" pushw %ss\n"
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
" popw %ds\n"
" popw %es\n"
" popw %fs\n"
" popw %gs\n"
Move timer tick handling into Scheduler.
2018-11-07 23:24:59 +00:00
" mov %esp, %eax\n"
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
" call timer_interrupt_handler\n"
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
" popw %gs\n"
Lots of hacking: - Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard. - Implement MM::unmapRegionsForTask() and MM::unmapRegion() - Save SS correctly on interrupt. - Add a simple Spawn syscall for launching another process. - Move a bunch of IO syscall debug output behind DEBUG_IO. - Have ASSERT do a "cli" immediately when failing. This makes the output look proper every time. - Implement a bunch of syscalls in LibC. - Add a simple shell ("sh"). All it can do now is read a line of text from /dev/keyboard and then try launching the specified executable by calling spawn(). There are definitely bugs in here, but we're moving on forward.
2018-10-23 08:12:50 +00:00
" popw %gs\n"
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
" popw %fs\n"
" popw %es\n"
" popw %ds\n"
" popa\n"
" iret\n"
);
/* Timer related ports */
#define TIMER0_CTL 0x40
#define TIMER1_CTL 0x41
#define TIMER2_CTL 0x42
#define PIT_CTL 0x43
/* Building blocks for PIT_CTL */
#define TIMER0_SELECT 0x00
#define TIMER1_SELECT 0x40
#define TIMER2_SELECT 0x80
#define MODE_COUNTDOWN 0x00
#define MODE_ONESHOT 0x02
#define MODE_RATE 0x04
#define MODE_SQUARE_WAVE 0x06
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
#define WRITE_WORD 0x30
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
#define BASE_FREQUENCY 1193182
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
static dword s_ticks_this_second;
static dword s_seconds_since_boot;
Implement event loop timers. GObjects can now register a timer with the GEventLoop. This will eventually cause GTimerEvents to be dispatched to the GObject. This needed a few supporting changes in the kernel: - The PIT now ticks 1000 times/sec. - select() now supports an arbitrary timeout. - gettimeofday() now returns something in the tv_usec field. With these changes, the clock window in guitest2 finally ticks on its own.
2019-02-01 02:50:06 +00:00
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
void timer_interrupt_handler(RegisterDump& regs)
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
{
IRQHandlerScope scope(IRQ_TIMER);
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
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;
}
Move timer tick handling into Scheduler.
2018-11-07 23:24:59 +00:00
Scheduler::timer_tick(regs);
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
}
namespace PIT {
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
dword ticks_this_second()
Implement event loop timers. GObjects can now register a timer with the GEventLoop. This will eventually cause GTimerEvents to be dispatched to the GObject. This needed a few supporting changes in the kernel: - The PIT now ticks 1000 times/sec. - select() now supports an arbitrary timeout. - gettimeofday() now returns something in the tv_usec field. With these changes, the clock window in guitest2 finally ticks on its own.
2019-02-01 02:50:06 +00:00
{
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
return s_ticks_this_second;
Implement event loop timers. GObjects can now register a timer with the GEventLoop. This will eventually cause GTimerEvents to be dispatched to the GObject. This needed a few supporting changes in the kernel: - The PIT now ticks 1000 times/sec. - select() now supports an arbitrary timeout. - gettimeofday() now returns something in the tv_usec field. With these changes, the clock window in guitest2 finally ticks on its own.
2019-02-01 02:50:06 +00:00
}
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
dword seconds_since_boot()
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
{
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
return s_seconds_since_boot;
}
Implement event loop timers. GObjects can now register a timer with the GEventLoop. This will eventually cause GTimerEvents to be dispatched to the GObject. This needed a few supporting changes in the kernel: - The PIT now ticks 1000 times/sec. - select() now supports an arbitrary timeout. - gettimeofday() now returns something in the tv_usec field. With these changes, the clock window in guitest2 finally ticks on its own.
2019-02-01 02:50:06 +00:00
Kernel: Do timekeeping manually instead of asking the RTC all the time. This introduces a tiny amount of timer drift which I will have to fix somehow eventually, but it's a huge improvement in timing consistency as we no longer suddenly jump from e.g 10:45:49.123 to 10:45:50.000.
2019-03-25 01:06:57 +00:00
void initialize()
{
Make bash-2.05b build with minimal changes. This is really neat. :^)
2018-11-16 23:11:08 +00:00
word timer_reload;
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
IO::out8(PIT_CTL, TIMER0_SELECT | WRITE_WORD | MODE_SQUARE_WAVE);
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
timer_reload = (BASE_FREQUENCY / TICKS_PER_SECOND);
Clean up some uninteresting log spam.
2019-02-06 10:32:23 +00:00
kprintf("PIT: %u Hz, square wave (%x)\n", TICKS_PER_SECOND, timer_reload);
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
IO::out8(TIMER0_CTL, LSB(timer_reload));
IO::out8(TIMER0_CTL, MSB(timer_reload));
Big, possibly complete sweep of naming changes.
2019-01-31 16:31:23 +00:00
register_interrupt_handler(IRQ_VECTOR_BASE + IRQ_TIMER, timer_interrupt_entry);
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
PIC::enable(IRQ_TIMER);
}
}
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