AMU: Add assembler helper functions for aarch32
Change-Id: Id6dfe885a63561b1d2649521bd020367b96ae1af
Signed-off-by: Joel Hutton <joel.hutton@arm.com>
diff --git a/lib/extensions/amu/aarch32/amu_helpers.S b/lib/extensions/amu/aarch32/amu_helpers.S
new file mode 100644
index 0000000..84dca04
--- /dev/null
+++ b/lib/extensions/amu/aarch32/amu_helpers.S
@@ -0,0 +1,265 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <assert_macros.S>
+#include <asm_macros.S>
+
+ .globl amu_group0_cnt_read_internal
+ .globl amu_group0_cnt_write_internal
+ .globl amu_group1_cnt_read_internal
+ .globl amu_group1_cnt_write_internal
+ .globl amu_group1_set_evtype_internal
+
+/*
+ * uint64_t amu_group0_cnt_read_internal(int idx);
+ *
+ * Given `idx`, read the corresponding AMU counter
+ * and return it in `r0`.
+ */
+func amu_group0_cnt_read_internal
+#if ENABLE_ASSERTIONS
+ /* `idx` should be between [0, 3] */
+ mov r1, r0
+ lsr r1, r1, #2
+ cmp r1, #0
+ ASM_ASSERT(eq)
+#endif
+
+ /*
+ * Given `idx` calculate address of ldcopr16/bx lr instruction pair
+ * in the table below.
+ */
+ adr r1, 1f
+ lsl r0, r0, #3 /* each ldcopr16/bx lr sequence is 8 bytes */
+ add r1, r1, r0
+ bx r1
+1:
+ ldcopr16 r0, r1, AMEVCNTR00 /* index 0 */
+ bx lr
+ ldcopr16 r0, r1, AMEVCNTR01 /* index 1 */
+ bx lr
+ ldcopr16 r0, r1, AMEVCNTR02 /* index 2 */
+ bx lr
+ ldcopr16 r0, r1, AMEVCNTR03 /* index 3 */
+ bx lr
+endfunc amu_group0_cnt_read_internal
+
+/*
+ * void amu_group0_cnt_write_internal(int idx, uint64_t val);
+ *
+ * Given `idx`, write `val` to the corresponding AMU counter.
+ */
+func amu_group0_cnt_write_internal
+#if ENABLE_ASSERTIONS
+ /* `idx` should be between [0, 3] */
+ mov r2, r0
+ lsr r2, r2, #2
+ cmp r2, #0
+ ASM_ASSERT(eq)
+#endif
+
+ /*
+ * Given `idx` calculate address of stcopr16/bx lr instruction pair
+ * in the table below.
+ */
+ adr r2, 1f
+ lsl r0, r0, #3 /* each stcopr16/bx lr sequence is 8 bytes */
+ add r2, r2, r0
+ bx r2
+
+1:
+ stcopr16 r0,r1, AMEVCNTR00 /* index 0 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR01 /* index 1 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR02 /* index 2 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR03 /* index 3 */
+ bx lr
+endfunc amu_group0_cnt_write_internal
+
+/*
+ * uint64_t amu_group1_cnt_read_internal(int idx);
+ *
+ * Given `idx`, read the corresponding AMU counter
+ * and return it in `r0`.
+ */
+func amu_group1_cnt_read_internal
+#if ENABLE_ASSERTIONS
+ /* `idx` should be between [0, 15] */
+ mov r2, r0
+ lsr r2, r2, #4
+ cmp r2, #0
+ ASM_ASSERT(eq)
+#endif
+
+ /*
+ * Given `idx` calculate address of ldcopr16/bx lr instruction pair
+ * in the table below.
+ */
+ adr r1, 1f
+ lsl r0, r0, #3 /* each ldcopr16/bx lr sequence is 8 bytes */
+ add r1, r1, r0
+ bx r1
+
+1:
+ ldcopr16 r0,r1, AMEVCNTR10 /* index 0 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR11 /* index 1 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR12 /* index 2 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR13 /* index 3 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR14 /* index 4 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR15 /* index 5 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR16 /* index 6 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR17 /* index 7 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR18 /* index 8 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR19 /* index 9 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1A /* index 10 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1B /* index 11 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1C /* index 12 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1D /* index 13 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1E /* index 14 */
+ bx lr
+ ldcopr16 r0,r1, AMEVCNTR1F /* index 15 */
+ bx lr
+endfunc amu_group1_cnt_read_internal
+
+/*
+ * void amu_group1_cnt_write_internal(int idx, uint64_t val);
+ *
+ * Given `idx`, write `val` to the corresponding AMU counter.
+ */
+func amu_group1_cnt_write_internal
+#if ENABLE_ASSERTIONS
+ /* `idx` should be between [0, 15] */
+ mov r2, r0
+ lsr r2, r2, #4
+ cmp r2, #0
+ ASM_ASSERT(eq)
+#endif
+
+ /*
+ * Given `idx` calculate address of ldcopr16/bx lr instruction pair
+ * in the table below.
+ */
+ adr r2, 1f
+ lsl r0, r0, #3 /* each stcopr16/bx lr sequence is 8 bytes */
+ add r2, r2, r0
+ bx r2
+
+1:
+ stcopr16 r0,r1, AMEVCNTR10 /* index 0 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR11 /* index 1 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR12 /* index 2 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR13 /* index 3 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR14 /* index 4 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR15 /* index 5 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR16 /* index 6 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR17 /* index 7 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR18 /* index 8 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR19 /* index 9 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1A /* index 10 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1B /* index 11 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1C /* index 12 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1D /* index 13 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1E /* index 14 */
+ bx lr
+ stcopr16 r0,r1, AMEVCNTR1F /* index 15 */
+ bx lr
+endfunc amu_group1_cnt_write_internal
+
+/*
+ * void amu_group1_set_evtype_internal(int idx, unsigned int val);
+ *
+ * Program the AMU event type register indexed by `idx`
+ * with the value `val`.
+ */
+func amu_group1_set_evtype_internal
+#if ENABLE_ASSERTIONS
+ /* `idx` should be between [0, 15] */
+ mov r2, r0
+ lsr r2, r2, #4
+ cmp r2, #0
+ ASM_ASSERT(eq)
+
+ /* val should be between [0, 65535] */
+ mov r2, r1
+ lsr r2, r2, #16
+ cmp r2, #0
+ ASM_ASSERT(eq)
+#endif
+
+ /*
+ * Given `idx` calculate address of stcopr/bx lr instruction pair
+ * in the table below.
+ */
+ adr r2, 1f
+ lsl r0, r0, #3 /* each stcopr/bx lr sequence is 8 bytes */
+ add r2, r2, r0
+ bx r2
+
+1:
+ stcopr r0, AMEVTYPER10 /* index 0 */
+ bx lr
+ stcopr r0, AMEVTYPER11 /* index 1 */
+ bx lr
+ stcopr r0, AMEVTYPER12 /* index 2 */
+ bx lr
+ stcopr r0, AMEVTYPER13 /* index 3 */
+ bx lr
+ stcopr r0, AMEVTYPER14 /* index 4 */
+ bx lr
+ stcopr r0, AMEVTYPER15 /* index 5 */
+ bx lr
+ stcopr r0, AMEVTYPER16 /* index 6 */
+ bx lr
+ stcopr r0, AMEVTYPER17 /* index 7 */
+ bx lr
+ stcopr r0, AMEVTYPER18 /* index 8 */
+ bx lr
+ stcopr r0, AMEVTYPER19 /* index 9 */
+ bx lr
+ stcopr r0, AMEVTYPER1A /* index 10 */
+ bx lr
+ stcopr r0, AMEVTYPER1B /* index 11 */
+ bx lr
+ stcopr r0, AMEVTYPER1C /* index 12 */
+ bx lr
+ stcopr r0, AMEVTYPER1D /* index 13 */
+ bx lr
+ stcopr r0, AMEVTYPER1E /* index 14 */
+ bx lr
+ stcopr r0, AMEVTYPER1F /* index 15 */
+ bx lr
+endfunc amu_group1_set_evtype_internal