feat(cpus): add support for Nevis CPU
Adding basic CPU library code to support Nevis CPU
Change-Id: I399cc9b7b2d907b02b76ea2a3e5abb54e28fbf6c
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
diff --git a/lib/cpus/aarch64/nevis.S b/lib/cpus/aarch64/nevis.S
new file mode 100644
index 0000000..36830a9
--- /dev/null
+++ b/lib/cpus/aarch64/nevis.S
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <common/bl_common.h>
+#include <nevis.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Nevis must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Nevis supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+cpu_reset_func_start nevis
+ /* ----------------------------------------------------
+ * Disable speculative loads
+ * ----------------------------------------------------
+ */
+ msr SSBS, xzr
+cpu_reset_func_end nevis
+
+func nevis_core_pwr_dwn
+ /* ---------------------------------------------------
+ * Enable CPU power down bit in power control register
+ * ---------------------------------------------------
+ */
+ sysreg_bit_set NEVIS_IMP_CPUPWRCTLR_EL1, \
+ NEVIS_IMP_CPUPWRCTLR_EL1_CORE_PWRDN_EN_BIT
+ isb
+ ret
+endfunc nevis_core_pwr_dwn
+
+errata_report_shim nevis
+
+.section .rodata.nevis_regs, "aS"
+nevis_regs: /* The ASCII list of register names to be reported */
+ .asciz "cpuectlr_el1", ""
+
+func nevis_cpu_reg_dump
+ adr x6, nevis_regs
+ mrs x8, NEVIS_CPUECTLR_EL1
+ ret
+endfunc nevis_cpu_reg_dump
+
+declare_cpu_ops nevis, NEVIS_MIDR, \
+ nevis_reset_func, \
+ nevis_core_pwr_dwn