cos2000v2/lib/scheduler.c

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/*******************************************************************************/
/* COS2000 - Compatible Operating System - LGPL v3 - Hordé Nicolas */
/* */
#include "interrupts.h"
#include "types.h"
#include "asm.h"
#include "memory.h"
#include "timer.h"
#include "vga.h"
#include "gdt.h"
#include "process.h"
static u8 curs[4] = { "-\\|/" };
static u8 curspos = 0;
static u32 time = 0;
/******************************************************************************/
/* Récupère la valeur du timer */
/* SYSCALL
{
"ID":4,
"NAME":"getticks",
"LIBRARY":"libsys",
"INTERNALNAME":"gettimer",
"DESCRIPTION":"Return the internal value of the timer",
"ARGS": [],
"RETURN":"u32"
}
END */
u32 gettimer(void)
{
return time;
}
/******************************************************************************/
/* Handler d'interruption du timer IRQ 0 */
__attribute__ ((noreturn)) void timer_handler(regs *dump)
{
exception_stack_noerror *caller = (exception_stack_noerror*) ((u32*)dump->esp+1);
bool noerror,user;
if (caller->cs==SEL_KERNEL_CODE || caller->cs==SEL_USER_CODE)
{
noerror=true;
dump->eip = caller->eip;
dump->cs = caller->cs;
dump->eflags = caller->eflags;
if (dump->cs==SEL_KERNEL_CODE)
{
dump->esp = (u32) caller + sizeof(exception_stack_noerror);
user=false;
}
else
{
dump->esp = (u32) ((exception_stack_noerror_user*) caller)->esp;
dump->ss = (u32) ((exception_stack_noerror_user*) caller)->ss;
user=true;
}
}
else
{
noerror=false;
dump->eip = ((exception_stack*)caller)->eip;
dump->cs = ((exception_stack*)caller)->cs;
if (dump->cs==SEL_KERNEL_CODE)
{
dump->esp = (u32) caller + sizeof(exception_stack);
user=false;
}
else
{
dump->esp = (u32) ((exception_stack_user*) caller)->esp;
dump->ss = (u32) ((exception_stack_user*) caller)->ss;
user=true;
}
}
irqendmaster();
showchar(0, 0, curs[curspos], 7);
curspos = (curspos + 1) & 0x3;
time++;
task *new=getschedule();
if (new!=NULL)
{
task *old=findcurrenttask();
memcpy(dump, &old->dump, sizeof(regs), 0);
switchtask(new->tid);
}
if (dump->cs==SEL_KERNEL_CODE)
{
setESP(dump);
restcpu_kernel();
}
else
{
setESP(dump);
restcpu_user();
iret();
}
}
/*******************************************************************************/