1 // Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies).
2 // All rights reserved.
3 // This component and the accompanying materials are made available
4 // under the terms of the License "Eclipse Public License v1.0"
5 // which accompanies this distribution, and is available
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
8 // Initial Contributors:
9 // Nokia Corporation - initial contribution.
14 // template\template_variant\specific\variant.cia
22 /******************************************************************************
23 * Interrupt handling/dispatch
24 ******************************************************************************/
25 __NAKED__ void XIntDispatch(TAny*)
27 // Service second-level Variant Interrupts
28 // Enter with r0->{Variant int controller base; Handlers;}
29 asm("stmfd sp!, {r4,lr} ");
30 asm("ldmia r0, {r3,r4} "); // r3=Variant interrupt controller base, r4->handlers
32 asm("ldr r0, [r3, #%a0]" : : "i" ((TInt)KHoIntContEnable)); // r0=bitmask with enabled interrupts
33 asm("ldr r1, [r3, #%a0]" : : "i" ((TInt)KHoIntContPending)); // r1=bitmask with pending interrupts
34 asm("mov r2, #31 "); // int id
35 asm("and r0, r0, r1 ");
36 asm("bics r0, r0, #0xf8000000 "); // mask unused bits (only 26 2nd-level ints defined)
37 asm("ldmeqfd sp!, {r4,pc} "); // if no 2nd level interrupts pending, exit
38 asm("cmp r0, #0x00010000 ");
39 asm("movcc r0, r0, lsl #16 ");
40 asm("subcc r2, r2, #16 ");
41 asm("cmp r0, #0x01000000 ");
42 asm("movcc r0, r0, lsl #8 ");
43 asm("subcc r2, r2, #8 ");
44 asm("cmp r0, #0x10000000 ");
45 asm("movcc r0, r0, lsl #4 ");
46 asm("subcc r2, r2, #4 ");
47 asm("cmp r0, #0x40000000 ");
48 asm("movcc r0, r0, lsl #2 ");
49 asm("subcc r2, r2, #2 ");
50 asm("cmp r0, #0x80000000 ");
51 asm("subcc r2, r2, #1 "); // r2=bit no. of MS 1
52 asm("add r0, r4, r2, lsl #3 "); // r0->handler for this interrupt
53 asm("adr lr, 0b "); // look again after calling handler
54 asm("ldmia r0, {r0,pc} "); // jump to handler