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1/* arch/arm/mach-exynos4/include/mach/entry-macro.S
2 *
3 * Cloned from arch/arm/mach-realview/include/mach/entry-macro.S
4 *
5 * Low-level IRQ helper macros for EXYNOS4 platforms
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10*/
11
12#include <mach/hardware.h>
13#include <asm/hardware/gic.h>
14
15 .macro disable_fiq
16 .endm
17
18 .macro get_irqnr_preamble, base, tmp
19 ldr \base, =gic_cpu_base_addr
20 ldr \base, [\base]
21 .endm
22
23 .macro arch_ret_to_user, tmp1, tmp2
24 .endm
25
26 /*
27 * The interrupt numbering scheme is defined in the
28 * interrupt controller spec. To wit:
29 *
30 * Interrupts 0-15 are IPI
31 * 16-28 are reserved
32 * 29-31 are local. We allow 30 to be used for the watchdog.
33 * 32-1020 are global
34 * 1021-1022 are reserved
35 * 1023 is "spurious" (no interrupt)
36 *
37 * For now, we ignore all local interrupts so only return an interrupt if it's
38 * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
39 *
40 * A simple read from the controller will tell us the number of the highest
41 * priority enabled interrupt. We then just need to check whether it is in the
42 * valid range for an IRQ (30-1020 inclusive).
43 */
44
45 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
46
47 ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
48
49 ldr \tmp, =1021
50
51 bic \irqnr, \irqstat, #0x1c00
52
53 cmp \irqnr, #29
54 cmpcc \irqnr, \irqnr
55 cmpne \irqnr, \tmp
56 cmpcs \irqnr, \irqnr
57 addne \irqnr, \irqnr, #32
58
59 .endm
60
61 /* We assume that irqstat (the raw value of the IRQ acknowledge
62 * register) is preserved from the macro above.
63 * If there is an IPI, we immediately signal end of interrupt on the
64 * controller, since this requires the original irqstat value which
65 * we won't easily be able to recreate later.
66 */
67
68 .macro test_for_ipi, irqnr, irqstat, base, tmp
69 bic \irqnr, \irqstat, #0x1c00
70 cmp \irqnr, #16
71 strcc \irqstat, [\base, #GIC_CPU_EOI]
72 cmpcs \irqnr, \irqnr
73 .endm
74
75 /* As above, this assumes that irqstat and base are preserved.. */
76
77 .macro test_for_ltirq, irqnr, irqstat, base, tmp
78 bic \irqnr, \irqstat, #0x1c00
79 mov \tmp, #0
80 cmp \irqnr, #29
81 moveq \tmp, #1
82 streq \irqstat, [\base, #GIC_CPU_EOI]
83 cmp \tmp, #0
84 .endm