main(void)
{
set_eflags();
/* Define the kernel segment registers */
set_seg_regs(__KERNEL_DS, __KERNEL_DS, INITIAL_ESP);
printk("Kernel Loaded! ");
/* Initialize hardware data */
setGdt(); /* Definicio de la taula de segments de memoria */
setIdt(); /* Definicio del vector de interrupcions */
setTSS(); /* Definicio de la TSS */
/* Initialize Memory */
init_mm();
/* Initialize an address space to be used for the monoprocess version of ZeOS */
/* monoprocess_init_addr_space(); TO BE DELETED WHEN ADDED THE PROCESS MANAGEMENT CODE TO BECOME MULTIPROCESS */
/* Initialize Scheduling */
init_sched();
/* Initialize idle task data */
init_idle();
/* Initialize task 1 data */
init_task1();
/* Initialize keyboard buffer */
init_keyboard_buffer();
/* Move user code/data now (after the page table initialization) */
copy_data((void *) KERNEL_START + *p_sys_size, usr_main, *p_usr_size);
/* Adds this call in order to perform test suite provided by lab course */
zeos_init_auxjp();
printk("Entering user mode...");
/*
* zeos_ticks must be initialized after memory initialization and just before
* enabling interrupts in order to measure the correct elapsed time
*/
zeos_ticks = 0;
enable_int();
/*
* We return from a 'theorical' call to a 'call gate' to reduce our privileges
* and going to execute 'magically' at 'usr_main'...
*/
return_gate(__USER_DS, __USER_DS, USER_ESP, __USER_CS, L_USER_START);
/* The execution never arrives to this point */
return 0;
}
void init_idt() {
for (unsigned int i = 0; i < sizeof(IDT); i++) {
*(((char *)IDT)+i) = 0;
}
set_idt_descriptor(0, _isr_0, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(1, _isr_1, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(2, _isr_2, 0x08, IDT_DPL0 | IDT_INT_32); //Intel reserved
set_idt_descriptor(3, _isr_3, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(4, _isr_4, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(5, _isr_5, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(6, _isr_6, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(7, _isr_7, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(8, _isr_8, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(9, _isr_9, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(10, _isr_10, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(11, _isr_11, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(12, _isr_12, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(13, _isr_13, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(14, _isr_14, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(15, _isr_15, 0x08, IDT_DPL0 | IDT_INT_32); //Intel reserved
set_idt_descriptor(16, _isr_16, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(17, _isr_17, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(18, _isr_18, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(19, _isr_19, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(20, _isr_20, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(21, _isr_21, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(22, _isr_22, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(23, _isr_23, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(24, _isr_24, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(25, _isr_25, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(26, _isr_26, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(27, _isr_27, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(28, _isr_28, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(29, _isr_29, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(30, _isr_30, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(31, _isr_31, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(32, _isr_32, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(33, _isr_33, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(34, _isr_34, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(35, _isr_35, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(36, _isr_36, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(37, _isr_37, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(38, _isr_38, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(39, _isr_39, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(40, _isr_40, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(41, _isr_41, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(42, _isr_42, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(43, _isr_43, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(44, _isr_44, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(45, _isr_45, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(46, _isr_46, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
set_idt_descriptor(47, _isr_47, 0x08, IDT_DPL0 | IDT_INT_32 | IDT_PRESENT);
setIdt(IDT, sizeof(IDT));
}
main(void)
{
set_eflags();
/* Define the kernel segment registers and a stack to execute the 'main' code */
// It is necessary to use a global static array for the stack, because the
// compiler will know its final memory location. Otherwise it will try to use the
// 'ds' register to access the address... but we are not ready for that yet
// (we are still in real mode).
set_seg_regs(__KERNEL_DS, __KERNEL_DS, (DWord) &protected_tasks[5]);
printk("Kernel Loaded! ");
/* Initialize hardware data */
setGdt(); /* Definicio de la taula de segments de memoria */
setIdt(); /* Definicio del vector de interrupcions */
setTSS(); /* Definicio de la TSS */
/* Initialize Memory */
init_mm();
/* Initialize an address space to be used for the monoprocess version of ZeOS */
monoprocess_init_addr_space(); /* TO BE DELETED WHEN ADDED THE PROCESS MANAGEMENT CODE TO BECOME MULTIPROCESS */
/* Initialize Scheduling */
init_sched();
/* Initialize idle task data */
init_idle();
/* Initialize task 1 data */
init_task1();
/* Initialize semaphores */
init_semaphores();
/* Move user code/data now (after the page table initialization) */
copy_data((void *) KERNEL_START + *p_sys_size, usr_main, *p_usr_size);
printk("Entering user mode...");
enable_int();
/*
* We return from a 'theorical' call to a 'call gate' to reduce our privileges
* and going to execute 'magically' at 'usr_main'...
*/
return_gate(__USER_DS, __USER_DS, USER_ESP, __USER_CS, L_USER_START);
/* The execution never arrives to this point */
return 0;
}
main(void)
{
set_eflags();
/* Define the kernel segment registers */
set_seg_regs(__KERNEL_DS, __KERNEL_DS, KERNEL_ESP);
printk("Kernel Loaded! ");
/* Initialize hardware data */
setGdt(); /* Definicio de la taula de segments de memoria */
setIdt(); /* Definicio del vector de interrupcions */
setTSS(); /* Definicio de la TSS */
/* Initialize Memory */
init_mm();
/* Initialize an address space to be used for the monoprocess version of ZeOS */
// monoprocess_init_addr_space(); /* TO BE DELETED WHEN ADDED THE PROCESS MANAGEMENT CODE TO BECOME MULTIPROCESS */
/* Initialize Scheduling */
init_sched();
/* Initialize idle task data */
init_idle();
/* Initialize task 1 data */
init_task1();
/* Move user code/data now (after the page table initialization) */
copy_data((void *) KERNEL_START + *p_sys_size, usr_main, *p_usr_size);
printk("Entering user mode...");
enable_int();
/*
* We return from a 'theorical' call to a 'call gate' to reduce our privileges
* and going to execute 'magically' at 'usr_main'...
*/
return_gate(__USER_DS, __USER_DS, USER_ESP, __USER_CS, L_USER_START);
/* The execution never arrives to this point */
return 0;
}
main(void)
{
set_eflags();
/* Define the kernel segment registers */
set_seg_regs(__KERNEL_DS, __KERNEL_DS, KERNEL_ESP);
printk("Kernel Loaded! ");
/* Initialize hardware data */
setGdt(); /* Definicio de la taula de segments de memoria */
setIdt(); /* Definicio del vector de interrupcions */
setTSS(); /* Definicio de la TSS */
/* Initialize Memory */
init_mm();
/* Initialize task 0 data */
//init_task0();
init_sched();
/* Move user code/data now (after the page table initialization) */
copy_data((void *) KERNEL_START + *p_sys_size, usr_main, *p_usr_size);
enable_int();
printk("Entering user mode...");
/*
* We return from a 'theorical' call to a 'call gate' to reduce our privileges
* and going to execute 'magically' at 'usr_main'...
*/
return_gate(__USER_DS, __USER_DS, USER_ESP, __USER_CS, L_USER_START);
/* The execution never arrives to this point */
return 0;
}
