1 files changed, 130 insertions, 0 deletions
diff --git a/lib/cpus/aarch64/rainier.S b/lib/cpus/aarch64/rainier.S
new file mode 100644
index 000000000..3017a5012
--- /dev/null
+++ b/lib/cpus/aarch64/rainier.S
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2020, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <context.h>
+#include <cpu_macros.S>
+#include <cpuamu.h>
+#include <rainier.h>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Rainier CPU must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Rainier CPU supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+/* --------------------------------------------------
+ * Disable speculative loads if Rainier supports
+ * SSBS.
+ *
+ * Shall clobber: x0.
+ * --------------------------------------------------
+ */
+func rainier_disable_speculative_loads
+	/* Check if the PE implements SSBS */
+	mrs	x0, id_aa64pfr1_el1
+	tst	x0, #(ID_AA64PFR1_EL1_SSBS_MASK << ID_AA64PFR1_EL1_SSBS_SHIFT)
+	b.eq	1f
+
+	/* Disable speculative loads */
+	msr	SSBS, xzr
+
+1:
+	ret
+endfunc rainier_disable_speculative_loads
+
+func rainier_reset_func
+	mov	x19, x30
+
+	bl	rainier_disable_speculative_loads
+
+	/* Forces all cacheable atomic instructions to be near */
+	mrs	x0, RAINIER_CPUACTLR2_EL1
+	orr	x0, x0, #RAINIER_CPUACTLR2_EL1_BIT_2
+	msr	RAINIER_CPUACTLR2_EL1, x0
+	isb
+
+	bl	cpu_get_rev_var
+	mov	x18, x0
+
+#if ENABLE_AMU
+	/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
+	mrs	x0, actlr_el3
+	orr	x0, x0, #RAINIER_ACTLR_AMEN_BIT
+	msr	actlr_el3, x0
+
+	/* Make sure accesses from EL0/EL1 are not trapped to EL2 */
+	mrs	x0, actlr_el2
+	orr	x0, x0, #RAINIER_ACTLR_AMEN_BIT
+	msr	actlr_el2, x0
+
+	/* Enable group0 counters */
+	mov	x0, #RAINIER_AMU_GROUP0_MASK
+	msr	CPUAMCNTENSET_EL0, x0
+#endif
+
+	isb
+	ret	x19
+endfunc rainier_reset_func
+
+	/* ---------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ---------------------------------------------
+	 */
+func rainier_core_pwr_dwn
+	/* ---------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------
+	 */
+	mrs	x0, RAINIER_CPUPWRCTLR_EL1
+	orr	x0, x0, #RAINIER_CORE_PWRDN_EN_MASK
+	msr	RAINIER_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc rainier_core_pwr_dwn
+
+#if REPORT_ERRATA
+/*
+ * Errata printing function for Rainier. Must follow AAPCS.
+ */
+func rainier_errata_report
+	stp	x8, x30, [sp, #-16]!
+
+	bl	cpu_get_rev_var
+	mov	x8, x0
+
+	ldp	x8, x30, [sp], #16
+	ret
+endfunc rainier_errata_report
+#endif
+
+	/* ---------------------------------------------
+	 * This function provides Rainier specific
+	 * register information for crash reporting.
+	 * It needs to return with x6 pointing to
+	 * a list of register names in ascii and
+	 * x8 - x15 having values of registers to be
+	 * reported.
+	 * ---------------------------------------------
+	 */
+.section .rodata.rainier_regs, "aS"
+rainier_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func rainier_cpu_reg_dump
+	adr	x6, rainier_regs
+	mrs	x8, RAINIER_CPUECTLR_EL1
+	ret
+endfunc rainier_cpu_reg_dump
+
+declare_cpu_ops rainier, RAINIER_MIDR, \
+	rainier_reset_func, \
+	rainier_core_pwr_dwn