/* irq_init.c
*
* This file contains the implementation of rtems initialization
* related to interrupt handling.
*
* CopyRight (C) 1998 valette@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <libcpu/cpu.h>
#include <irq.h>
#include <bsp.h>
#include <rtems/bspIo.h>
/*
* rtems prologue generated in irq_asm.S
*/
extern void rtems_irq_prologue_0();
extern void rtems_irq_prologue_1();
extern void rtems_irq_prologue_2();
extern void rtems_irq_prologue_3();
extern void rtems_irq_prologue_4();
extern void rtems_irq_prologue_5();
extern void rtems_irq_prologue_6();
extern void rtems_irq_prologue_7();
extern void rtems_irq_prologue_8();
extern void rtems_irq_prologue_9();
extern void rtems_irq_prologue_10();
extern void rtems_irq_prologue_11();
extern void rtems_irq_prologue_12();
extern void rtems_irq_prologue_13();
extern void rtems_irq_prologue_14();
extern void rtems_irq_prologue_15();
/*
* default idt vector
*/
extern void default_raw_idt_handler();
/*
* default on/off function
*/
static void nop_func(){}
/*
* default isOn function
*/
static int not_connected() {return 0;}
static rtems_raw_irq_connect_data idtHdl[IDT_SIZE];
/*
* Table used to store rtems managed interrupt handlers.
* Borrow the table to store raw handler entries at the beginning.
* The table will be reinitialized before the call to BSP_rtems_irq_mngt_set().
*/
static rtems_irq_connect_data rtemsIrq[BSP_IRQ_LINES_NUMBER] = {
{0,(rtems_irq_hdl)rtems_irq_prologue_0},
{0,(rtems_irq_hdl)rtems_irq_prologue_1},
{0,(rtems_irq_hdl)rtems_irq_prologue_2},
{0,(rtems_irq_hdl)rtems_irq_prologue_3},
{0,(rtems_irq_hdl)rtems_irq_prologue_4},
{0,(rtems_irq_hdl)rtems_irq_prologue_5},
{0,(rtems_irq_hdl)rtems_irq_prologue_6},
{0,(rtems_irq_hdl)rtems_irq_prologue_7},
{0,(rtems_irq_hdl)rtems_irq_prologue_8},
{0,(rtems_irq_hdl)rtems_irq_prologue_9},
{0,(rtems_irq_hdl)rtems_irq_prologue_10},
{0,(rtems_irq_hdl)rtems_irq_prologue_11},
{0,(rtems_irq_hdl)rtems_irq_prologue_12},
{0,(rtems_irq_hdl)rtems_irq_prologue_13},
{0,(rtems_irq_hdl)rtems_irq_prologue_14},
{0,(rtems_irq_hdl)rtems_irq_prologue_15}
};
static rtems_raw_irq_connect_data defaultRawIrq = {
/* vectorIdex, hdl , on , off , isOn */
0, default_raw_idt_handler ,nop_func , nop_func, not_connected
};
static rtems_irq_connect_data defaultIrq = {
/* vectorIdex, hdl , on , off , isOn */
0, nop_func , nop_func , nop_func , not_connected
};
static rtems_irq_prio irqPrioTable[BSP_IRQ_LINES_NUMBER]={
/*
* actual rpiorities for interrupt :
* 0 means that only current interrupt is masked
* 255 means all other interrupts are masked
* The second entry has a priority of 255 because
* it is the slave pic entry and is should always remain
* unmasked.
*/
0,0,
255,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static interrupt_gate_descriptor idtEntry;
static rtems_irq_global_settings initial_config;
static rtems_raw_irq_global_settings raw_initial_config;
void raw_idt_notify()
{
printk("raw_idt_notify has been called \n");
}
void rtems_irq_mngt_init()
{
int i;
interrupt_gate_descriptor* idt_entry_tbl;
unsigned int limit;
unsigned int level;
i386_get_info_from_IDTR(&idt_entry_tbl, &limit);
/* Convert into number of entries */
limit = (limit + 1)/sizeof(interrupt_gate_descriptor);
if(limit != IDT_SIZE) {
printk("IDT table size mismatch !!! System locked\n");
while(1);
}
_CPU_ISR_Disable(level);
/*
* Init the complete IDT vector table with defaultRawIrq value
*/
for (i = 0; i < IDT_SIZE ; i++) {
idtHdl[i] = defaultRawIrq;
idtHdl[i].idtIndex = i;
}
raw_initial_config.idtSize = IDT_SIZE;
raw_initial_config.defaultRawEntry = defaultRawIrq;
raw_initial_config.rawIrqHdlTbl = idtHdl;
if (!i386_init_idt (&raw_initial_config)) {
/*
* put something here that will show the failure...
*/
printk("Unable to initialize IDT!!! System locked\n");
while (1);
}
/*
* Patch the entry that will be used by RTEMS for interrupt management
* with RTEMS prologue.
*/
for (i = 0; i < BSP_IRQ_LINES_NUMBER; i++) {
create_interrupt_gate_descriptor(&idtEntry,(rtems_raw_irq_hdl) rtemsIrq[i].hdl);
idt_entry_tbl[i + BSP_ASM_IRQ_VECTOR_BASE] = idtEntry;
}
/*
* At this point we have completed the initialization of IDT
* with raw handlers. We must now initialize the higher level
* interrupt management.
*/
/*
* re-init the rtemsIrq table
*/
for (i = 0; i < BSP_IRQ_LINES_NUMBER; i++) {
rtemsIrq[i] = defaultIrq;
rtemsIrq[i].name = i;
}
/*
* Init initial Interrupt management config
*/
initial_config.irqNb = BSP_IRQ_LINES_NUMBER;
initial_config.defaultEntry = defaultIrq;
initial_config.irqHdlTbl = rtemsIrq;
initial_config.irqBase = BSP_ASM_IRQ_VECTOR_BASE;
initial_config.irqPrioTbl = irqPrioTable;
if (!BSP_rtems_irq_mngt_set(&initial_config)) {
/*
* put something here that will show the failure...
*/
printk("Unable to initialize RTEMS interrupt Management!!! System locked\n");
while (1);
}
/*
* #define DEBUG
*/
#ifdef DEBUG
{
/*
* following adresses should be the same
*/
unsigned tmp;
printk("idt_entry_tbl = %x Interrupt_descriptor_table addr = %x\n",
idt_entry_tbl, &Interrupt_descriptor_table);
tmp = (unsigned) get_hdl_from_vector (BSP_ASM_IRQ_VECTOR_BASE + BSP_PERIODIC_TIMER);
printk("clock isr address from idt = %x should be %x\n",
tmp, (unsigned) rtems_irq_prologue_0);
}
printk("i8259s_cache = %x\n", * (unsigned short*) &i8259s_cache);
BSP_wait_polled_input();
#endif
}
