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Move timer tick handling into Scheduler.

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This commit is contained in:
Andreas Kling 2018-11-08 00:24:59 +01:00
parent 27fded7002
commit ac1d12465f
3 changed files with 56 additions and 59 deletions
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47
Kernel/Scheduler.cpp
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@ -258,3 +258,50 @@ void Scheduler::initialize()
current = nullptr;
load_task_register(s_redirection.selector);
}
void Scheduler::timer_tick(RegisterDump& regs)
{
if (!current)
return;
system.uptime++;
if (current->tick())
return;
current->tss().gs = regs.gs;
current->tss().fs = regs.fs;
current->tss().es = regs.es;
current->tss().ds = regs.ds;
current->tss().edi = regs.edi;
current->tss().esi = regs.esi;
current->tss().ebp = regs.ebp;
current->tss().ebx = regs.ebx;
current->tss().edx = regs.edx;
current->tss().ecx = regs.ecx;
current->tss().eax = regs.eax;
current->tss().eip = regs.eip;
current->tss().cs = regs.cs;
current->tss().eflags = regs.eflags;
// Compute process stack pointer.
// Add 12 for CS, EIP, EFLAGS (interrupt mechanic)
current->tss().esp = regs.esp + 12;
current->tss().ss = regs.ss;
if ((current->tss().cs & 3) != 0) {
current->tss().ss = regs.ss_if_crossRing;
current->tss().esp = regs.esp_if_crossRing;
}
if (!pick_next())
return;
prepare_for_iret_to_new_process();
// Set the NT (nested task) flag.
asm(
"pushf\n"
"orl $0x00004000, (%esp)\n"
"popf\n"
);
}