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/* irq_init.c
*
* This file contains the implementation of rtems initialization
* related to interrupt handling.
*
* Copyright (c) 2009 embedded brains GmbH
* CopyRight (C) 1998 valette@crf.canon.fr
*
* COPYRIGHT (c) 2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems/bspIo.h>
#include <rtems/score/cpu.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
/*
* rtems prologue generated in irq_asm.S
*/
extern void rtems_irq_prologue_0(void);
extern void rtems_irq_prologue_1(void);
extern void rtems_irq_prologue_2(void);
extern void rtems_irq_prologue_3(void);
extern void rtems_irq_prologue_4(void);
extern void rtems_irq_prologue_5(void);
extern void rtems_irq_prologue_6(void);
extern void rtems_irq_prologue_7(void);
extern void rtems_irq_prologue_8(void);
extern void rtems_irq_prologue_9(void);
extern void rtems_irq_prologue_10(void);
extern void rtems_irq_prologue_11(void);
extern void rtems_irq_prologue_12(void);
extern void rtems_irq_prologue_13(void);
extern void rtems_irq_prologue_14(void);
extern void rtems_irq_prologue_15(void);
extern void rtems_irq_prologue_16(void);
/*
* default vectors
*/
extern void default_raw_idt_handler(void);
/*
* default raw on/off function
*/
static void raw_nop_func(const struct __rtems_raw_irq_connect_data__ *unused)
{
}
/*
* default raw isOn function
*/
static int raw_not_connected(
const struct __rtems_raw_irq_connect_data__ *unused
)
{
return 0;
}
static rtems_raw_irq_connect_data idtHdl[IDT_SIZE];
static rtems_raw_irq_hdl rtemsIrq[BSP_IRQ_VECTOR_NUMBER] = {
rtems_irq_prologue_0,
rtems_irq_prologue_1,
rtems_irq_prologue_2,
rtems_irq_prologue_3,
rtems_irq_prologue_4,
rtems_irq_prologue_5,
rtems_irq_prologue_6,
rtems_irq_prologue_7,
rtems_irq_prologue_8,
rtems_irq_prologue_9,
rtems_irq_prologue_10,
rtems_irq_prologue_11,
rtems_irq_prologue_12,
rtems_irq_prologue_13,
rtems_irq_prologue_14,
rtems_irq_prologue_15,
rtems_irq_prologue_16,
};
static rtems_raw_irq_connect_data defaultRawIrq = {
0, /* vectorIdex */
default_raw_idt_handler, /* hdl */
raw_nop_func, /* on */
raw_nop_func, /* off */
raw_not_connected /* isOn */
};
static interrupt_gate_descriptor idtEntry;
static rtems_raw_irq_global_settings raw_initial_config;
/*
* This method is called from irq_asm.S and cannot be static.
*/
void raw_idt_notify(void)
{
printk("raw_idt_notify has been called \n");
}
void rtems_irq_mngt_init(void)
{
int i;
interrupt_gate_descriptor* idt_entry_tbl;
unsigned int limit;
rtems_interrupt_level 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);
}
/*
* The interrupt management can be initialized only once
* during system bootup and that should happen on boot
* CPU so there is no need to synchronize with others CPUs.
*/
rtems_interrupt_local_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_VECTOR_NUMBER; i++) {
create_interrupt_gate_descriptor(&idtEntry, rtemsIrq[i]);
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.
*/
/*
* Init initial Interrupt management config
*/
bsp_interrupt_initialize();
/*
* #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
}
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