blob: 7c154ec9cfbfe9f8693d289ab55b906756f34a49 (
plain) (
tree)
|
|
/*
*
* This file contains the implementation of the function described in irq.h
*
* Copyright (C) 1998, 1999 valette@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <stdlib.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/VME.h>
#include <rtems/score/apiext.h> /* for post ISR signal processing */
#include <libcpu/raw_exception.h>
#include <libcpu/io.h>
#include <bsp/vectors.h>
#include <stdlib.h>
#include <rtems/bspIo.h> /* for printk */
/*
* default handler connected on each irq after bsp initialization
*/
static rtems_irq_connect_data default_rtems_entry;
/*
* location used to store initial tables used for interrupt
* management.
*/
static rtems_irq_global_settings* internal_config;
static rtems_irq_connect_data* rtems_hdl_tbl;
/*
* Check if IRQ is an ISA IRQ
*/
static inline int is_isa_irq(const rtems_irq_number irqLine)
{
return (((int) irqLine <= BSP_ISA_IRQ_MAX_OFFSET) &
((int) irqLine >= BSP_ISA_IRQ_LOWEST_OFFSET)
);
}
/*
* Check if IRQ is an pci IRQ
*/
static inline int is_pci_irq(const rtems_irq_number irqLine)
{
return (((int) irqLine <= BSP_PCI_IRQ_MAX_OFFSET) &
((int) irqLine >= BSP_PCI_IRQ_LOWEST_OFFSET)
);
}
/*
* Check if IRQ is a Processor IRQ
*/
static inline int is_processor_irq(const rtems_irq_number irqLine)
{
return (((int) irqLine <= BSP_PROCESSOR_IRQ_MAX_OFFSET) &
((int) irqLine >= BSP_PROCESSOR_IRQ_LOWEST_OFFSET)
);
}
/*
* ------------------------ RTEMS Irq helper functions ----------------
*/
/*
* This function check that the value given for the irq line
* is valid.
*/
static int isValidInterrupt(int irq)
{
if ( (irq < BSP_LOWEST_OFFSET) || (irq > BSP_MAX_OFFSET))
return 0;
return 1;
}
/*
* ------------------------ RTEMS Shared Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq)
{
unsigned int level;
rtems_irq_connect_data* vchain;
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
_CPU_ISR_Disable(level);
if ( (int)rtems_hdl_tbl[irq->name].next_handler == -1 ) {
_CPU_ISR_Enable(level);
printk("IRQ vector %d already connected to an unshared handler\n",irq->name);
return 0;
}
vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data));
/* save off topmost handler */
vchain[0]= rtems_hdl_tbl[irq->name];
/*
* store the data provided by user
*/
rtems_hdl_tbl[irq->name] = *irq;
/* link chain to new topmost handler */
rtems_hdl_tbl[irq->name].next_handler = (void *)vchain;
/*
* XXX FIX ME
*/
if (is_pci_irq(irq->name)) {
}
if (is_processor_irq(irq->name)) {
/*
* Enable exception at processor level
*/
}
/*
* Enable interrupt on device
*/
irq->on(irq);
_CPU_ISR_Enable(level);
return 1;
}
/*
* ------------------------ RTEMS Single Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
unsigned int level;
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
/*
* Check if default handler is actually connected. If not issue an error.
* You must first get the current handler via i386_get_current_idt_entry
* and then disconnect it using i386_delete_idt_entry.
* RATIONALE : to always have the same transition by forcing the user
* to get the previous handler before accepting to disconnect.
*/
_CPU_ISR_Disable(level);
if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) {
_CPU_ISR_Enable(level);
printk("IRQ vector %d already connected\n",irq->name);
return 0;
}
/*
* store the data provided by user
*/
rtems_hdl_tbl[irq->name] = *irq;
rtems_hdl_tbl[irq->name].next_handler = (void *)-1;
/* XXX -FIX ME !! */
if (is_pci_irq(irq->name)) {
/*
* Enable interrupt
*/
}
if (is_processor_irq(irq->name)) {
/*
* Enable exception at processor level
*/
}
/*
* Enable interrupt on device
*/
irq->on(irq);
_CPU_ISR_Enable(level);
return 1;
}
int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq)
{
unsigned int level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
_CPU_ISR_Disable(level);
*irq = rtems_hdl_tbl[irq->name];
_CPU_ISR_Enable(level);
return 1;
}
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_irq_connect_data *pchain= NULL, *vchain = NULL;
unsigned int level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if default handler is actually connected. If not issue an error.
* You must first get the current handler via i386_get_current_idt_entry
* and then disconnect it using i386_delete_idt_entry.
* RATIONALE : to always have the same transition by forcing the user
* to get the previous handler before accepting to disconnect.
*/
_CPU_ISR_Disable(level);
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) {
_CPU_ISR_Enable(level);
return 0;
}
if( (int)rtems_hdl_tbl[irq->name].next_handler != -1 )
{
int found = 0;
for( (pchain= NULL, vchain = &rtems_hdl_tbl[irq->name]);
(vchain->hdl != default_rtems_entry.hdl);
(pchain= vchain, vchain = (rtems_irq_connect_data*)vchain->next_handler) )
{
if( vchain->hdl == irq->hdl )
{
found= -1; break;
}
}
if( !found )
{
_CPU_ISR_Enable(level);
return 0;
}
}
else
{
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl)
{
_CPU_ISR_Enable(level);
return 0;
}
}
/* XXX - FIX ME !! */
if (is_pci_irq(irq->name)) {
/*
* disable interrupt
*/
}
if (is_processor_irq(irq->name)) {
/*
* disable exception at processor level
*/
}
/*
* Disable interrupt on device
*/
irq->off(irq);
/*
* restore the default irq value
*/
if( !vchain )
{
/* single handler vector... */
rtems_hdl_tbl[irq->name] = default_rtems_entry;
}
else
{
if( pchain )
{
/* non-first handler being removed */
pchain->next_handler = vchain->next_handler;
}
else
{
/* first handler isn't malloc'ed, so just overwrite it. Since
the contents of vchain are being struct copied, vchain itself
goes away */
rtems_hdl_tbl[irq->name]= *vchain;
}
free(vchain);
}
_CPU_ISR_Enable(level);
return 1;
}
/*
* RTEMS Global Interrupt Handler Management Routines
*/
int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config)
{
int i;
unsigned int level;
/*
* Store various code accelerators
*/
internal_config = config;
default_rtems_entry = config->defaultEntry;
rtems_hdl_tbl = config->irqHdlTbl;
_CPU_ISR_Disable(level);
/*
* set up internal tables used by rtems interrupt prologue
*/
/*
* XXX - FIX ME !!!
*/
for (i=BSP_PCI_IRQ_LOWEST_OFFSET; i < BSP_PCI_IRQ_LOWEST_OFFSET + BSP_PCI_IRQ_NUMBER ; i++) {
if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) {
{
rtems_irq_connect_data* vchain;
for( vchain = &rtems_hdl_tbl[i];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->on(vchain);
}
}
}
else {
/* rtems_hdl_tbl[i].off(&rtems_hdl_tbl[i]); */
{
rtems_irq_connect_data* vchain;
for( vchain = &rtems_hdl_tbl[i];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->off(vchain);
}
}
}
}
/*
* finish with Processor exceptions handled like IRQ
*/
for (i=BSP_PROCESSOR_IRQ_LOWEST_OFFSET; i < BSP_PROCESSOR_IRQ_LOWEST_OFFSET+BSP_PROCESSOR_IRQ_NUMBER; i++){
if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) {
{
rtems_irq_connect_data* vchain;
for( vchain = &rtems_hdl_tbl[i];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->on(vchain);
}
}
}
else {
{
rtems_irq_connect_data* vchain;
for( vchain = &rtems_hdl_tbl[i];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->off(vchain);
}
}
}
}
_CPU_ISR_Enable(level);
return 1;
}
int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config)
{
*config = internal_config;
return 0;
}
unsigned BSP_spuriousIntr = 0;
/*
* High level IRQ handler called from shared_raw_irq_code_entry
*/
void C_dispatch_irq_handler (CPU_Interrupt_frame *frame, unsigned int excNum)
{
register unsigned int irq;
register unsigned msr;
register unsigned new_msr;
if (excNum == ASM_DEC_VECTOR) {
_CPU_MSR_GET(msr);
new_msr = msr | MSR_EE;
_CPU_MSR_SET(new_msr);
rtems_hdl_tbl[BSP_DECREMENTER].hdl(rtems_hdl_tbl[BSP_DECREMENTER].handle);
_CPU_MSR_SET(msr);
return;
}
irq = read_and_clear_irq();
_CPU_MSR_GET(msr);
new_msr = msr | MSR_EE;
_CPU_MSR_SET(new_msr);
/* rtems_hdl_tbl[irq].hdl(rtems_hdl_tbl[irq].handle); */
{
rtems_irq_connect_data* vchain;
for( vchain = &rtems_hdl_tbl[irq];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
vchain->hdl(vchain->handle);
}
}
_CPU_MSR_SET(msr);
}
void _ThreadProcessSignalsFromIrq (BSP_Exception_frame* ctx)
{
/*
* Process pending signals that have not already been
* processed by _Thread_Displatch. This happens quite
* unfrequently : the ISR must have posted an action
* to the current running thread.
*/
if ( _Thread_Do_post_task_switch_extension ||
_Thread_Executing->do_post_task_switch_extension ) {
_Thread_Executing->do_post_task_switch_extension = FALSE;
_API_extensions_Run_postswitch();
}
/*
* I plan to process other thread related events here.
* This will include DEBUG session requested from keyboard...
*/
}
|
