1 /* 2 * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #ifndef __CPU_MACROS_S__ 7 #define __CPU_MACROS_S__ 8 9 #include <arch.h> 10 #include <errata_report.h> 11 12 #define CPU_IMPL_PN_MASK (MIDR_IMPL_MASK << MIDR_IMPL_SHIFT) | \ 13 (MIDR_PN_MASK << MIDR_PN_SHIFT) 14 15 /* The number of CPU operations allowed */ 16 #define CPU_MAX_PWR_DWN_OPS 2 17 18 /* Special constant to specify that CPU has no reset function */ 19 #define CPU_NO_RESET_FUNC 0 20 21 /* Word size for 32-bit CPUs */ 22 #define CPU_WORD_SIZE 4 23 24 /* 25 * Whether errata status needs reporting. Errata status is printed in debug 26 * builds for both BL1 and BL32 images. 27 */ 28 #if (defined(IMAGE_BL1) || defined(IMAGE_BL32)) && DEBUG 29 # define REPORT_ERRATA 1 30 #else 31 # define REPORT_ERRATA 0 32 #endif 33 34 /* 35 * Define the offsets to the fields in cpu_ops structure. 36 */ 37 .struct 0 38 CPU_MIDR: /* cpu_ops midr */ 39 .space 4 40 /* Reset fn is needed during reset */ 41 #if defined(IMAGE_BL1) || defined(IMAGE_BL32) 42 CPU_RESET_FUNC: /* cpu_ops reset_func */ 43 .space 4 44 #endif 45 #ifdef IMAGE_BL32 /* The power down core and cluster is needed only in BL32 */ 46 CPU_PWR_DWN_OPS: /* cpu_ops power down functions */ 47 .space (4 * CPU_MAX_PWR_DWN_OPS) 48 #endif 49 50 /* 51 * Fields required to print errata status. Only in BL32 that the printing 52 * require mutual exclusion and printed flag. 53 */ 54 #if REPORT_ERRATA 55 CPU_ERRATA_FUNC: /* CPU errata status printing function */ 56 .space 4 57 #ifdef IMAGE_BL32 58 CPU_ERRATA_LOCK: 59 .space 4 60 CPU_ERRATA_PRINTED: 61 .space 4 62 #endif 63 #endif 64 65 CPU_OPS_SIZE = . 66 67 /* 68 * Write given expressions as words 69 * 70 * _count: 71 * Write at least _count words. If the given number of expressions 72 * is less than _count, repeat the last expression to fill _count 73 * words in total 74 * _rest: 75 * Optional list of expressions. _this is for parameter extraction 76 * only, and has no significance to the caller 77 * 78 * Invoked as: 79 * fill_constants 2, foo, bar, blah, ... 80 */ 81 .macro fill_constants _count:req, _this, _rest:vararg 82 .ifgt \_count 83 /* Write the current expression */ 84 .ifb \_this 85 .error "Nothing to fill" 86 .endif 87 .word \_this 88 89 /* Invoke recursively for remaining expressions */ 90 .ifnb \_rest 91 fill_constants \_count-1, \_rest 92 .else 93 fill_constants \_count-1, \_this 94 .endif 95 .endif 96 .endm 97 98 /* 99 * Declare CPU operations 100 * 101 * _name: 102 * Name of the CPU for which operations are being specified 103 * _midr: 104 * Numeric value expected to read from CPU's MIDR 105 * _resetfunc: 106 * Reset function for the CPU. If there's no CPU reset function, 107 * specify CPU_NO_RESET_FUNC 108 * _power_down_ops: 109 * Comma-separated list of functions to perform power-down 110 * operatios on the CPU. At least one, and up to 111 * CPU_MAX_PWR_DWN_OPS number of functions may be specified. 112 * Starting at power level 0, these functions shall handle power 113 * down at subsequent power levels. If there aren't exactly 114 * CPU_MAX_PWR_DWN_OPS functions, the last specified one will be 115 * used to handle power down at subsequent levels 116 */ 117 .macro declare_cpu_ops _name:req, _midr:req, _resetfunc:req, \ 118 _power_down_ops:vararg 119 .section cpu_ops, "a" 120 .align 2 121 .type cpu_ops_\_name, %object 122 .word \_midr 123 #if defined(IMAGE_BL1) || defined(IMAGE_BL32) 124 .word \_resetfunc 125 #endif 126 #ifdef IMAGE_BL32 127 1: 128 /* Insert list of functions */ 129 fill_constants CPU_MAX_PWR_DWN_OPS, \_power_down_ops 130 2: 131 /* 132 * Error if no or more than CPU_MAX_PWR_DWN_OPS were specified in the 133 * list 134 */ 135 .ifeq 2b - 1b 136 .error "At least one power down function must be specified" 137 .else 138 .iflt 2b - 1b - (CPU_MAX_PWR_DWN_OPS * CPU_WORD_SIZE) 139 .error "More than CPU_MAX_PWR_DWN_OPS functions specified" 140 .endif 141 .endif 142 #endif 143 144 #if REPORT_ERRATA 145 .ifndef \_name\()_cpu_str 146 /* 147 * Place errata reported flag, and the spinlock to arbitrate access to 148 * it in the data section. 149 */ 150 .pushsection .data 151 define_asm_spinlock \_name\()_errata_lock 152 \_name\()_errata_reported: 153 .word 0 154 .popsection 155 156 /* Place CPU string in rodata */ 157 .pushsection .rodata 158 \_name\()_cpu_str: 159 .asciz "\_name" 160 .popsection 161 .endif 162 163 /* 164 * Weakly-bound, optional errata status printing function for CPUs of 165 * this class. 166 */ 167 .weak \_name\()_errata_report 168 .word \_name\()_errata_report 169 170 #ifdef IMAGE_BL32 171 /* Pointers to errata lock and reported flag */ 172 .word \_name\()_errata_lock 173 .word \_name\()_errata_reported 174 #endif 175 #endif 176 .endm 177 178 #if REPORT_ERRATA 179 /* 180 * Print status of a CPU errata 181 * 182 * _chosen: 183 * Identifier indicating whether or not a CPU errata has been 184 * compiled in. 185 * _cpu: 186 * Name of the CPU 187 * _id: 188 * Errata identifier 189 * _rev_var: 190 * Register containing the combined value CPU revision and variant 191 * - typically the return value of cpu_get_rev_var 192 */ 193 .macro report_errata _chosen, _cpu, _id, _rev_var=r4 194 /* Stash a string with errata ID */ 195 .pushsection .rodata 196 \_cpu\()_errata_\_id\()_str: 197 .asciz "\_id" 198 .popsection 199 200 /* Check whether errata applies */ 201 mov r0, \_rev_var 202 bl check_errata_\_id 203 204 .ifeq \_chosen 205 /* 206 * Errata workaround has not been compiled in. If the errata would have 207 * applied had it been compiled in, print its status as missing. 208 */ 209 cmp r0, #0 210 movne r0, #ERRATA_MISSING 211 .endif 212 ldr r1, =\_cpu\()_cpu_str 213 ldr r2, =\_cpu\()_errata_\_id\()_str 214 bl errata_print_msg 215 .endm 216 #endif 217 218 #endif /* __CPU_MACROS_S__ */ 219
