/*
* ------------------------ RTEMS Shared Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
rtems_irq_connect_data* vchain;
printk(" BSP_install_rtems_shared_irq_handler %d\n", irq->name );
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
rtems_interrupt_disable(level);
if ( (int)rtems_hdl_tbl[irq->name].next_handler == -1 ) {
rtems_interrupt_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
*/
if (irq->on)
irq->on(irq);
rtems_interrupt_enable(level);
return 1;
}
int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
rtems_interrupt_disable(level);
*irq = rtems_hdl_tbl[irq->name];
rtems_interrupt_enable(level);
return 1;
}
/*
* ------------------------ RTEMS Shared Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
rtems_irq_connect_data* vchain;
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
/* pre-allocate memory outside of critical section */
vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data));
rtems_interrupt_disable(level);
if ( (int)rtems_hdl_tbl[irq->name].next_handler == -1 ) {
rtems_interrupt_enable(level);
printk("IRQ vector %d already connected to an unshared handler\n",irq->name);
free(vchain);
return 0;
}
/* 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;
/*
* enable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC
*/
BSP_enable_irq_at_pic(irq->name);
/*
* Enable interrupt on device
*/
if (irq->on)
irq->on(irq);
rtems_interrupt_enable(level);
return 1;
}
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level 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.
*/
rtems_interrupt_disable(level);
if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) {
rtems_interrupt_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;
/*
* enable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC
*/
BSP_enable_irq_at_pic(irq->name);
/*
* Enable interrupt on device
*/
if (irq->on)
irq->on(irq);
rtems_interrupt_enable(level);
return 1;
}
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_irq_connect_data *pchain= NULL, *vchain = NULL;
rtems_interrupt_level 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.
*/
rtems_interrupt_disable(level);
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) {
rtems_interrupt_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 )
{
rtems_interrupt_enable(level);
return 0;
}
}
else
{
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl)
{
rtems_interrupt_enable(level);
return 0;
}
}
/*
* Disable interrupt on device
*/
if (irq->off)
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 */
vchain = vchain->next_handler;
rtems_hdl_tbl[irq->name]= *vchain;
}
}
/* Only disable at PIC if we removed the last handler */
if ( rtems_hdl_tbl[irq->name].hdl == default_rtems_entry.hdl ) {
/*
* disable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC;
*/
BSP_disable_irq_at_pic(irq->name);
}
rtems_interrupt_enable(level);
free(vchain);
return 1;
}
