aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-arm/arch-realview/entry-macro.S
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-arm/arch-realview/entry-macro.S')
-rw-r--r--include/asm-arm/arch-realview/entry-macro.S49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/asm-arm/arch-realview/entry-macro.S b/include/asm-arm/arch-realview/entry-macro.S
new file mode 100644
index 000000000000..2712ba77bb3a
--- /dev/null
+++ b/include/asm-arm/arch-realview/entry-macro.S
@@ -0,0 +1,49 @@
1/*
2 * include/asm-arm/arch-realview/entry-macro.S
3 *
4 * Low-level IRQ helper macros for RealView platforms
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11#include <asm/hardware/gic.h>
12
13 .macro disable_fiq
14 .endm
15
16 /*
17 * The interrupt numbering scheme is defined in the
18 * interrupt controller spec. To wit:
19 *
20 * Interrupts 0-15 are IPI
21 * 16-28 are reserved
22 * 29-31 are local. We allow 30 to be used for the watchdog.
23 * 32-1020 are global
24 * 1021-1022 are reserved
25 * 1023 is "spurious" (no interrupt)
26 *
27 * For now, we ignore all local interrupts so only return an interrupt if it's
28 * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
29 *
30 * A simple read from the controller will tell us the number of the highest
31 * priority enabled interrupt. We then just need to check whether it is in the
32 * valid range for an IRQ (30-1020 inclusive).
33 */
34
35 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
36
37 ldr \base, =IO_ADDRESS(REALVIEW_GIC_CPU_BASE)
38 ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
39
40 ldr \tmp, =1021
41
42 bic \irqnr, \irqstat, #0x1c00
43
44 cmp \irqnr, #29
45 cmpcc \irqnr, \irqnr
46 cmpne \irqnr, \tmp
47 cmpcs \irqnr, \irqnr
48
49 .endm