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Diffstat (limited to 'plat/arm/board/corstone700/common/corstone700_helpers.S')
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diff --git a/plat/arm/board/corstone700/common/corstone700_helpers.S b/plat/arm/board/corstone700/common/corstone700_helpers.S
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+/*
+ * Copyright (c) 2019, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <platform_def.h>
+
+ .globl plat_secondary_cold_boot_setup
+ .globl plat_get_my_entrypoint
+ .globl plat_is_my_cpu_primary
+ .globl plat_arm_calc_core_pos
+
+ /* --------------------------------------------------------------------
+ * void plat_secondary_cold_boot_setup (void);
+ *
+ * For AArch32, cold-booting secondary CPUs is not yet
+ * implemented and they panic.
+ * --------------------------------------------------------------------
+ */
+func plat_secondary_cold_boot_setup
+cb_panic:
+ b cb_panic
+endfunc plat_secondary_cold_boot_setup
+
+ /* ---------------------------------------------------------------------
+ * unsigned long plat_get_my_entrypoint (void);
+ *
+ * Main job of this routine is to distinguish between a cold and warm
+ * boot. On Corstone700, this information can be queried from the power
+ * controller. The Power Control SYS Status Register (PSYSR) indicates
+ * the wake-up reason for the CPU.
+ *
+ * For a cold boot, return 0.
+ * For a warm boot, Not yet supported.
+ *
+ * TODO: PSYSR is a common register and should be
+ * accessed using locks. Since it is not possible
+ * to use locks immediately after a cold reset
+ * we are relying on the fact that after a cold
+ * reset all cpus will read the same WK field
+ * ---------------------------------------------------------------------
+ */
+func plat_get_my_entrypoint
+ /* TODO support warm boot */
+ /* Cold reset */
+ mov r0, #0
+ bx lr
+endfunc plat_get_my_entrypoint
+
+ /* -----------------------------------------------------
+ * unsigned int plat_is_my_cpu_primary (void);
+ *
+ * Find out whether the current CPU is the primary
+ * CPU.
+ * -----------------------------------------------------
+ */
+func plat_is_my_cpu_primary
+ ldcopr r0, MPIDR
+ ldr r1, =MPIDR_AFFINITY_MASK
+ and r0, r1
+ cmp r0, #0
+ moveq r0, #1
+ movne r0, #0
+ bx lr
+endfunc plat_is_my_cpu_primary
+
+ /* ---------------------------------------------------------------------
+ * unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
+ *
+ * Function to calculate the core position on Corstone700.
+ *
+ * (ClusterId * MAX_CPUS_PER_CLUSTER * MAX_PE_PER_CPU) +
+ * (CPUId * MAX_PE_PER_CPU) +
+ * ThreadId
+ *
+ * which can be simplified as:
+ *
+ * ((ClusterId * MAX_CPUS_PER_CLUSTER + CPUId) * MAX_PE_PER_CPU)
+ * + ThreadId
+ * ---------------------------------------------------------------------
+ */
+func plat_arm_calc_core_pos
+ mov r3, r0
+
+ /* Extract individual affinity fields from MPIDR */
+ ubfx r0, r3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
+ ubfx r1, r3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
+ ubfx r2, r3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
+
+ /* Compute linear position */
+ mov r3, #CORSTONE700_MAX_CPUS_PER_CLUSTER
+ mla r1, r2, r3, r1
+ mov r3, #CORSTONE700_MAX_PE_PER_CPU
+ mla r0, r1, r3, r0
+
+ bx lr
+endfunc plat_arm_calc_core_pos