Nesting interrupts with ARM core

From: Jeo (jeo_at_ky___BIG-FISH-LITTLE-FISH___bert.com)
Date: 02/24/05 

Date: Thu, 24 Feb 2005 11:58:13 -0000

Hi,

i've read another recent post regarding nesting interrupts, but im not at
the same point, so ive started a new thread.

I am trying to enable an interrupt thread that is signalled when i receive
EINT0 interrupt. The arm core only has one IRQ.

Im lost in how i should do this. I've read the help files, but cant work out
what to do!

In my thread startup code, i do this (eror checking removed for simplisity):

-----------------------------------------------------------
m_hevInterrupt = CreateEvent(NULL, FALSE, FALSE, NULL); // auto-reseting
event object

KernelIoControl(IOCTL_HAL_REQUEST_SYSINTR, 1 /*IRQ*/, sizeof(DWORD),
&g_dwSysIntr_Btn, sizeof(DWORD), NULL);

InterruptInitialize(g_dwSysIntr_Btn, m_hevInterrupt, NULL, 0);

CeSetThreadPriority(GetCurrentThread(), (int)dwPriority);

ISRThreadLoop();
-----------------------------------------------------------

Then i have a Isr loop so service the interrupts:

-----------------------------------------------------------
IST loop:

SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);

m_bIsrThreadRunning = TRUE;
v_pInterruptReg->INTMSK &= (0x1 << 0); // unmask interrupt (enable
interrupt)
v_pInterruptReg->SRCPND &= ~(0x1 << 0); // clear interrupt pending flag
InterruptDone( g_dwSysIntr_Btn ); // forget the first one (if there is
one) becuase were still booting eeeeyyye!

for(;;)
{
    if(WaitForSingleObject(m_hevInterrupt, INFINITE) == WAIT_OBJECT_0)
    {
        // check that the interrupt was for us (interrupt is unmasked
(enabled) and interrupt is pending):

        if(((v_pInterruptReg->SRCPND & (0x1<<0))!=(0x1<<0)) ||
((v_pInterruptReg->INTMSK & (0x1<<0))!=0x0)) // see data*** page 14-7
        {
            InterruptDone(SYSINTR_CHAIN); // not for us
            continue;
        }

        // process interrupt here
        :
        :
        :

        v_pInterruptReg->SRCPND &= ~(0x1 << 0); // clear interrupt
pending flag
        InterruptDone( g_dwSysIntr_Btn ); // signal to OS that we have
finished
    }
}
return TRUE;

-----------------------------------------------------------

Problem is i receive a signalled condition when a keyboard button is
pressed, and the InterruptDone(SYSINTR_CHAIN); doesn't seem to pass the
interrupt to the keyboard handler!

What am i doing wrong?

Joe