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Diffstat (limited to 'lib/cpus/aarch64/rainier.S')
| -rw-r--r-- | lib/cpus/aarch64/rainier.S | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/lib/cpus/aarch64/rainier.S b/lib/cpus/aarch64/rainier.S new file mode 100644 index 0000000..584ab97 --- /dev/null +++ b/lib/cpus/aarch64/rainier.S @@ -0,0 +1,175 @@ +/* + * Copyright (c) 2020-2022, 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 + + /* -------------------------------------------------- + * Errata Workaround for Neoverse N1 Errata #1868343. + * This applies to revision <= r4p0 of Neoverse N1. + * This workaround is the same as the workaround for + * errata 1262606 and 1275112 but applies to a wider + * revision range. + * Rainier R0P0 is based on Neoverse N1 R4P0 so the + * workaround checks for r0p0 version of Rainier CPU. + * Inputs: + * x0: variant[4:7] and revision[0:3] of current cpu. + * Shall clobber: x0, x1 & x17 + * -------------------------------------------------- + */ +func errata_n1_1868343_wa + /* + * Compare x0 against revision r4p0 + */ + mov x17, x30 + bl check_errata_1868343 + cbz x0, 1f + mrs x1, RAINIER_CPUACTLR_EL1 + orr x1, x1, RAINIER_CPUACTLR_EL1_BIT_13 + msr RAINIER_CPUACTLR_EL1, x1 + isb +1: + ret x17 +endfunc errata_n1_1868343_wa + +func check_errata_1868343 + /* Applies to r0p0 of Rainier CPU */ + mov x1, #0x00 + b cpu_rev_var_ls +endfunc check_errata_1868343 + +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 ERRATA_N1_1868343 + mov x0, x18 + bl errata_n1_1868343_wa +#endif + +#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 + + /* + * Report all errata. The revision-variant information is passed to + * checking functions of each errata. + */ + report_errata ERRATA_N1_1868343, rainier, 1868343 + + 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 |