void install_apicIRQs(void)
{ /* install all additional IRQs */
#ifdef SMP
iInfos[CALL_FUNCTION_IRQNR].used = 1;
iInfos[CALL_FUNCTION_IRQNR].vector_number = CALL_FUNCTION_VECTOR;
iInfos[CALL_FUNCTION_IRQNR].functions = &ipIRQ;
/* install the IPI-Handlers*/
int_gate(CALL_FUNCTION_VECTOR, &call_function_ipi, 0x80 /*present bit */ | 14 /*irq gate */ );
#endif
iInfos[LAPIC_TIMER_IRQNR].used = 1;
iInfos[LAPIC_TIMER_IRQNR].vector_number = LAPIC_TIMER_VECTOR;
iInfos[LAPIC_TIMER_IRQNR].functions = &local_timer_IRQ;
#ifdef TIMESLICING_TIMER_IRQ
/* the system timer IRQ0 is set to hwint00apic ->"=disabled" */
iInfos[0].used = 0;
int_gate(iInfos[0].vector_number, hwint00apic, 0x80 /*present bit */ | 14 /*irq gate */ );
#endif
/* install the local APIC timer-Handlers*/
int_gate(LAPIC_TIMER_VECTOR, local_timer_int, 0x80 /*present bit */ | 14 /*irq gate */ );
/* install the error and spurious Handlers*/
int_gate(SPURIOUS_APIC_VECTOR, spurious_apic, 0x80 /*present bit */ | 14 /*irq gate */ );
int_gate(ERROR_APIC_VECTOR, error_apic, 0x80 /*present bit */ | 14 /*irq gate */ );
}
/**
* \brief Set up tables for protected mode
* All GDT slots are allocated at compile time
*/
void prot_init()
{
struct gate_table_s *gtp;
struct desctableptr_s *dtp;
unsigned ldt_index;
struct proc *rp;
static struct gate_table_s {
void (*gate)(void);
unsigned char vec_nr;
unsigned char privilege;
} gate_table[] = {
{ divide_error, DIVIDE_VECTOR, INTR_PRIVILEGE },
{ single_step_exception, DEBUG_VECTOR, INTR_PRIVILEGE },
{ nmi, NMI_VECTOR, INTR_PRIVILEGE },
{ breakpoint_exception, BREAKPOINT_VECTOR, USER_PRIVILEGE },
{ overflow, OVERFLOW_VECTOR, USER_PRIVILEGE },
{ bounds_check, BOUNDS_VECTOR, INTR_PRIVILEGE },
{ inval_opcode, INVAL_OP_VECTOR, INTR_PRIVILEGE },
{ copr_not_available, COPROC_NOT_VECTOR, INTR_PRIVILEGE },
{ double_fault, DOUBLE_FAULT_VECTOR, INTR_PRIVILEGE },
{ copr_seg_overrun, COPROC_SEG_VECTOR, INTR_PRIVILEGE },
{ inval_tss, INVAL_TSS_VECTOR, INTR_PRIVILEGE },
{ segment_not_present, SEG_NOT_VECTOR, INTR_PRIVILEGE },
{ stack_exception, STACK_FAULT_VECTOR, INTR_PRIVILEGE },
{ general_protection, PROTECTION_VECTOR, INTR_PRIVILEGE },
{ page_fault, PAGE_FAULT_VECTOR, INTR_PRIVILEGE },
{ copr_error, COPROC_ERR_VECTOR, INTR_PRIVILEGE },
{ hwint00, IRQ0_VECTOR + CLOCK_IRQ, INTR_PRIVILEGE },
{ hwint01, IRQ0_VECTOR + KEYBOARD_IRQ, INTR_PRIVILEGE },
{ hwint02, IRQ0_VECTOR + CASCADE_IRQ, INTR_PRIVILEGE },
{ hwint03, IRQ0_VECTOR + ETHER_IRQ, INTR_PRIVILEGE },
{ hwint04, IRQ0_VECTOR + RS232_IRQ, INTR_PRIVILEGE },
{ hwint05, IRQ0_VECTOR + 5, INTR_PRIVILEGE },
{ hwint06, IRQ0_VECTOR + 6, INTR_PRIVILEGE },
{ hwint07, IRQ0_VECTOR + 7, INTR_PRIVILEGE },
{ hwint08, IRQ0_VECTOR + 8, INTR_PRIVILEGE },
{ hwint09, IRQ0_VECTOR + 9, INTR_PRIVILEGE },
{ hwint10, IRQ0_VECTOR + 10, INTR_PRIVILEGE },
{ hwint11, IRQ0_VECTOR + 11, INTR_PRIVILEGE },
{ hwint12, IRQ0_VECTOR + 12, INTR_PRIVILEGE },
{ hwint13, IRQ0_VECTOR + 13, INTR_PRIVILEGE },
{ hwint14, IRQ0_VECTOR + IDE_IRQ, INTR_PRIVILEGE },
{ hwint15, IRQ0_VECTOR + 15, INTR_PRIVILEGE },
{ s_call, SYS_VECTOR, USER_PRIVILEGE }, // system call
{ level0_call, LEVEL0_VECTOR, TASK_PRIVILEGE },
};
/* since it is now in protected mode and it enters protected mode
* in boot loader where global segment descriptor is set up to
* map all physical memory, that is base is 0, and limit is MAX
* physical memory - 1
*
* so here when apply vir2phys ( kinfo.data_base + vir ), still
* get vir
*/
// Build gdt and idt pointers in GDT where the BIOS expects them
dtp = (struct desctableptr_s *) &gdt[GDT_INDEX];
*((u16_t *) dtp->limit) = (sizeof gdt) - 1;
*((u32_t *) dtp->base) = vir2phys(gdt);
dtp = (struct desctableptr_s *) &gdt[IDT_INDEX];
*((u16_t *) dtp->limit) = (sizeof idt) - 1;
*((u32_t *) dtp->base) = vir2phys(idt);
// Build segment descriptors for tasks and interrupt handlers
init_codeseg(&gdt[CS_INDEX], kinfo.code_base, kinfo.code_size, INTR_PRIVILEGE);
init_dataseg(&gdt[DS_INDEX], kinfo.data_base, kinfo.data_size, INTR_PRIVILEGE);
init_dataseg(&gdt[ES_INDEX], 0L, 0, TASK_PRIVILEGE);
// Build scratch descriptors for functions in klib88
init_dataseg(&gdt[DS_286_INDEX], 0L, 0, TASK_PRIVILEGE);
init_dataseg(&gdt[ES_286_INDEX], 0L, 0, TASK_PRIVILEGE);
/* Build local descriptors in GDT for LDT's in process table.
* The LDT's are allocated at compile time in the process table, and
* initialized whenever a process' map is initialized or changed.
*/
for (rp = BEG_PROC_ADDR, ldt_index = FIRST_LDT_INDEX; rp < END_PROC_ADDR; ++rp, ldt_index++)
{
init_dataseg(&gdt[ldt_index], vir2phys(rp->p_ldt), sizeof(rp->p_ldt), INTR_PRIVILEGE);
gdt[ldt_index].access = PRESENT | LDT;
rp->p_ldt_sel = ldt_index * DESC_SIZE;
}
/* Build main TSS.
* This is used only to record the stack pointer to be used after an interrupt.
* Actually it points to stackframe of proc
*
* The pointer is set up so that an interrupt automatically saves the
* current process's registers eip:cs:eflags:esp:ss in the correct slots in the
* process table.
*/
tss.ss0 = DS_SELECTOR;
init_dataseg(&gdt[TSS_INDEX], vir2phys(&tss), sizeof(tss), INTR_PRIVILEGE);
gdt[TSS_INDEX].access = PRESENT | (INTR_PRIVILEGE << DPL_SHIFT) | TSS_TYPE;
// Build descriptors for interrupt gates in IDT
for (gtp = &gate_table[0]; gtp < &gate_table[sizeof gate_table / sizeof gate_table[0]]; ++gtp)
{
int_gate(gtp->vec_nr, (vir_bytes) gtp->gate,
PRESENT | INT_GATE_TYPE | (gtp->privilege << DPL_SHIFT));
}
// Complete building of main TSS
tss.iobase = sizeof tss; // empty i/o permissions map
}