Enable v8.6 AMU enhancements (FEAT_AMUv1p1)
ARMv8.6 adds virtual offset registers to support virtualization of the
event counters in EL1 and EL0. This patch enables support for this
feature in EL3 firmware.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I7ee1f3d9f554930bf5ef6f3d492e932e6d95b217
diff --git a/lib/extensions/amu/aarch64/amu_helpers.S b/lib/extensions/amu/aarch64/amu_helpers.S
index 89007a3..9989abd 100644
--- a/lib/extensions/amu/aarch64/amu_helpers.S
+++ b/lib/extensions/amu/aarch64/amu_helpers.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -14,6 +14,12 @@
.globl amu_group1_cnt_write_internal
.globl amu_group1_set_evtype_internal
+ /* FEAT_AMUv1p1 virtualisation offset register functions */
+ .globl amu_group0_voffset_read_internal
+ .globl amu_group0_voffset_write_internal
+ .globl amu_group1_voffset_read_internal
+ .globl amu_group1_voffset_write_internal
+
/*
* uint64_t amu_group0_cnt_read_internal(int idx);
*
@@ -211,3 +217,169 @@
write AMEVTYPER1E_EL0 /* index 14 */
write AMEVTYPER1F_EL0 /* index 15 */
endfunc amu_group1_set_evtype_internal
+
+/*
+ * Accessor functions for virtual offset registers added with FEAT_AMUv1p1
+ */
+
+/*
+ * uint64_t amu_group0_voffset_read_internal(int idx);
+ *
+ * Given `idx`, read the corresponding AMU virtual offset register
+ * and return it in `x0`.
+ */
+func amu_group0_voffset_read_internal
+ adr x1, 1f
+#if ENABLE_ASSERTIONS
+ /*
+ * It can be dangerous to call this function with an
+ * out of bounds index. Ensure `idx` is valid.
+ */
+ tst x0, #~3
+ ASM_ASSERT(eq)
+ /* Make sure idx != 1 since AMEVCNTVOFF01_EL2 does not exist */
+ cmp x0, #1
+ ASM_ASSERT(ne)
+#endif
+ /*
+ * Given `idx` calculate address of mrs/ret instruction pair
+ * in the table below.
+ */
+ add x1, x1, x0, lsl #3 /* each mrs/ret sequence is 8 bytes */
+#if ENABLE_BTI
+ add x1, x1, x0, lsl #2 /* + "bti j" instruction */
+#endif
+ br x1
+
+1: read AMEVCNTVOFF00_EL2 /* index 0 */
+ .skip 8 /* AMEVCNTVOFF01_EL2 does not exist */
+#if ENABLE_BTI
+ .skip 4
+#endif
+ read AMEVCNTVOFF02_EL2 /* index 2 */
+ read AMEVCNTVOFF03_EL2 /* index 3 */
+endfunc amu_group0_voffset_read_internal
+
+/*
+ * void amu_group0_voffset_write_internal(int idx, uint64_t val);
+ *
+ * Given `idx`, write `val` to the corresponding AMU virtual offset register.
+ */
+func amu_group0_voffset_write_internal
+ adr x2, 1f
+#if ENABLE_ASSERTIONS
+ /*
+ * It can be dangerous to call this function with an
+ * out of bounds index. Ensure `idx` is valid.
+ */
+ tst x0, #~3
+ ASM_ASSERT(eq)
+ /* Make sure idx != 1 since AMEVCNTVOFF01_EL2 does not exist */
+ cmp x0, #1
+ ASM_ASSERT(ne)
+#endif
+ /*
+ * Given `idx` calculate address of mrs/ret instruction pair
+ * in the table below.
+ */
+ add x2, x2, x0, lsl #3 /* each msr/ret sequence is 8 bytes */
+#if ENABLE_BTI
+ add x2, x2, x0, lsl #2 /* + "bti j" instruction */
+#endif
+ br x2
+
+1: write AMEVCNTVOFF00_EL2 /* index 0 */
+ .skip 8 /* AMEVCNTVOFF01_EL2 does not exist */
+#if ENABLE_BTI
+ .skip 4
+#endif
+ write AMEVCNTVOFF02_EL2 /* index 2 */
+ write AMEVCNTVOFF03_EL2 /* index 3 */
+endfunc amu_group0_voffset_write_internal
+
+/*
+ * uint64_t amu_group1_voffset_read_internal(int idx);
+ *
+ * Given `idx`, read the corresponding AMU virtual offset register
+ * and return it in `x0`.
+ */
+func amu_group1_voffset_read_internal
+ adr x1, 1f
+#if ENABLE_ASSERTIONS
+ /*
+ * It can be dangerous to call this function with an
+ * out of bounds index. Ensure `idx` is valid.
+ */
+ tst x0, #~0xF
+ ASM_ASSERT(eq)
+#endif
+ /*
+ * Given `idx` calculate address of mrs/ret instruction pair
+ * in the table below.
+ */
+ add x1, x1, x0, lsl #3 /* each mrs/ret sequence is 8 bytes */
+#if ENABLE_BTI
+ add x1, x1, x0, lsl #2 /* + "bti j" instruction */
+#endif
+ br x1
+
+1: read AMEVCNTVOFF10_EL2 /* index 0 */
+ read AMEVCNTVOFF11_EL2 /* index 1 */
+ read AMEVCNTVOFF12_EL2 /* index 2 */
+ read AMEVCNTVOFF13_EL2 /* index 3 */
+ read AMEVCNTVOFF14_EL2 /* index 4 */
+ read AMEVCNTVOFF15_EL2 /* index 5 */
+ read AMEVCNTVOFF16_EL2 /* index 6 */
+ read AMEVCNTVOFF17_EL2 /* index 7 */
+ read AMEVCNTVOFF18_EL2 /* index 8 */
+ read AMEVCNTVOFF19_EL2 /* index 9 */
+ read AMEVCNTVOFF1A_EL2 /* index 10 */
+ read AMEVCNTVOFF1B_EL2 /* index 11 */
+ read AMEVCNTVOFF1C_EL2 /* index 12 */
+ read AMEVCNTVOFF1D_EL2 /* index 13 */
+ read AMEVCNTVOFF1E_EL2 /* index 14 */
+ read AMEVCNTVOFF1F_EL2 /* index 15 */
+endfunc amu_group1_voffset_read_internal
+
+/*
+ * void amu_group1_voffset_write_internal(int idx, uint64_t val);
+ *
+ * Given `idx`, write `val` to the corresponding AMU virtual offset register.
+ */
+func amu_group1_voffset_write_internal
+ adr x2, 1f
+#if ENABLE_ASSERTIONS
+ /*
+ * It can be dangerous to call this function with an
+ * out of bounds index. Ensure `idx` is valid.
+ */
+ tst x0, #~0xF
+ ASM_ASSERT(eq)
+#endif
+ /*
+ * Given `idx` calculate address of mrs/ret instruction pair
+ * in the table below.
+ */
+ add x2, x2, x0, lsl #3 /* each msr/ret sequence is 8 bytes */
+#if ENABLE_BTI
+ add x2, x2, x0, lsl #2 /* + "bti j" instruction */
+#endif
+ br x2
+
+1: write AMEVCNTVOFF10_EL2 /* index 0 */
+ write AMEVCNTVOFF11_EL2 /* index 1 */
+ write AMEVCNTVOFF12_EL2 /* index 2 */
+ write AMEVCNTVOFF13_EL2 /* index 3 */
+ write AMEVCNTVOFF14_EL2 /* index 4 */
+ write AMEVCNTVOFF15_EL2 /* index 5 */
+ write AMEVCNTVOFF16_EL2 /* index 6 */
+ write AMEVCNTVOFF17_EL2 /* index 7 */
+ write AMEVCNTVOFF18_EL2 /* index 8 */
+ write AMEVCNTVOFF19_EL2 /* index 9 */
+ write AMEVCNTVOFF1A_EL2 /* index 10 */
+ write AMEVCNTVOFF1B_EL2 /* index 11 */
+ write AMEVCNTVOFF1C_EL2 /* index 12 */
+ write AMEVCNTVOFF1D_EL2 /* index 13 */
+ write AMEVCNTVOFF1E_EL2 /* index 14 */
+ write AMEVCNTVOFF1F_EL2 /* index 15 */
+endfunc amu_group1_voffset_write_internal