1 files changed, 83 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos4/include/mach/entry-macro.S b/arch/arm/mach-exynos4/include/mach/entry-macro.S
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index 00000000000..d7a1e281ce7
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+++ b/arch/arm/mach-exynos4/include/mach/entry-macro.S
@@ -0,0 +1,83 @@
+/* arch/arm/mach-exynos4/include/mach/entry-macro.S
+ *
+ * Cloned from arch/arm/mach-realview/include/mach/entry-macro.S
+ *
+ * Low-level IRQ helper macros for EXYNOS4 platforms
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+*/
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+#include <asm/hardware/gic.h>
+
+                .macro  disable_fiq
+                .endm
+
+                .macro  get_irqnr_preamble, base, tmp
+                ldr     \base, =gic_cpu_base_addr
+                ldr     \base, [\base]
+                mrc     p15, 0, \tmp, c0, c0, 5
+                and     \tmp, \tmp, #3
+                cmp     \tmp, #1
+                addeq   \base, \base, #EXYNOS4_GIC_BANK_OFFSET
+                .endm
+
+                .macro  arch_ret_to_user, tmp1, tmp2
+                .endm
+
+                /*
+                 * The interrupt numbering scheme is defined in the
+                 * interrupt controller spec.  To wit:
+                 *
+                 * Interrupts 0-15 are IPI
+                 * 16-28 are reserved
+                 * 29-31 are local.  We allow 30 to be used for the watchdog.
+                 * 32-1020 are global
+                 * 1021-1022 are reserved
+                 * 1023 is "spurious" (no interrupt)
+                 *
+                 * For now, we ignore all local interrupts so only return an interrupt if it's
+                 * between 30 and 1020.  The test_for_ipi routine below will pick up on IPIs.
+                 *
+                 * A simple read from the controller will tell us the number of the highest
+                 * priority enabled interrupt.  We then just need to check whether it is in the
+                 * valid range for an IRQ (30-1020 inclusive).
+                 */
+
+                .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
+
+                ldr     \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
+
+                ldr     \tmp, =1021
+
+                bic     \irqnr, \irqstat, #0x1c00
+
+                cmp     \irqnr, #29
+                cmpcc   \irqnr, \irqnr
+                cmpne   \irqnr, \tmp
+                cmpcs   \irqnr, \irqnr
+                addne   \irqnr, \irqnr, #32
+
+                .endm
+
+                /* We assume that irqstat (the raw value of the IRQ acknowledge
+                 * register) is preserved from the macro above.
+                 * If there is an IPI, we immediately signal end of interrupt on the
+                 * controller, since this requires the original irqstat value which
+                 * we won't easily be able to recreate later.
+                 */
+
+                .macro test_for_ipi, irqnr, irqstat, base, tmp
+                bic     \irqnr, \irqstat, #0x1c00
+                cmp     \irqnr, #16
+                strcc   \irqstat, [\base, #GIC_CPU_EOI]
+                cmpcs   \irqnr, \irqnr
+                .endm
+
+                /* As above, this assumes that irqstat and base are preserved.. */
+
+                .macro test_for_ltirq, irqnr, irqstat, base, tmp
+                .endm