locore.h revision 1.21
1 /* $NetBSD: locore.h,v 1.21 2015/03/30 05:43:55 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1996 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Brini. 21 * 4. The name of the company nor the name of the author may be used to 22 * endorse or promote products derived from this software without specific 23 * prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * RiscBSD kernel project 38 * 39 * cpu.h 40 * 41 * CPU specific symbols 42 * 43 * Created : 18/09/94 44 * 45 * Based on kate/katelib/arm6.h 46 */ 47 48 #ifndef _ARM_LOCORE_H_ 49 #define _ARM_LOCORE_H_ 50 51 #ifdef _KERNEL_OPT 52 #include "opt_cpuoptions.h" 53 #include "opt_cputypes.h" 54 #include "opt_arm_debug.h" 55 #endif 56 57 #include <sys/pcu.h> 58 59 #include <arm/cpuconf.h> 60 #include <arm/armreg.h> 61 62 #include <machine/frame.h> 63 64 #ifdef _LOCORE 65 66 #if defined(_ARM_ARCH_6) 67 #define IRQdisable cpsid i 68 #define IRQenable cpsie i 69 #elif defined(__PROG32) 70 #define IRQdisable \ 71 stmfd sp!, {r0} ; \ 72 mrs r0, cpsr ; \ 73 orr r0, r0, #(I32_bit) ; \ 74 msr cpsr_c, r0 ; \ 75 ldmfd sp!, {r0} 76 77 #define IRQenable \ 78 stmfd sp!, {r0} ; \ 79 mrs r0, cpsr ; \ 80 bic r0, r0, #(I32_bit) ; \ 81 msr cpsr_c, r0 ; \ 82 ldmfd sp!, {r0} 83 #else 84 /* Not yet used in 26-bit code */ 85 #endif 86 87 #if defined (TPIDRPRW_IS_CURCPU) 88 #define GET_CURCPU(rX) mrc p15, 0, rX, c13, c0, 4 89 #define GET_CURLWP(rX) GET_CURCPU(rX); ldr rX, [rX, #CI_CURLWP] 90 #elif defined (TPIDRPRW_IS_CURLWP) 91 #define GET_CURLWP(rX) mrc p15, 0, rX, c13, c0, 4 92 #if defined (MULTIPROCESSOR) 93 #define GET_CURCPU(rX) GET_CURLWP(rX); ldr rX, [rX, #L_CPU] 94 #elif defined(_ARM_ARCH_7) 95 #define GET_CURCPU(rX) movw rX, #:lower16:cpu_info_store; movt rX, #:upper16:cpu_info_store 96 #else 97 #define GET_CURCPU(rX) ldr rX, =_C_LABEL(cpu_info_store) 98 #endif 99 #elif !defined(MULTIPROCESSOR) 100 #define GET_CURCPU(rX) ldr rX, =_C_LABEL(cpu_info_store) 101 #define GET_CURLWP(rX) GET_CURCPU(rX); ldr rX, [rX, #CI_CURLWP] 102 #endif 103 #define GET_CURPCB(rX) GET_CURLWP(rX); ldr rX, [rX, #L_PCB] 104 105 #else /* !_LOCORE */ 106 107 #include <arm/cpufunc.h> 108 109 #ifdef __PROG32 110 #define IRQdisable __set_cpsr_c(I32_bit, I32_bit); 111 #define IRQenable __set_cpsr_c(I32_bit, 0); 112 #else 113 #define IRQdisable set_r15(R15_IRQ_DISABLE, R15_IRQ_DISABLE); 114 #define IRQenable set_r15(R15_IRQ_DISABLE, 0); 115 #endif 116 117 /* 118 * Validate a PC or PSR for a user process. Used by various system calls 119 * that take a context passed by the user and restore it. 120 */ 121 122 #ifdef __PROG32 123 #ifdef __NO_FIQ 124 #define VALID_R15_PSR(r15,psr) \ 125 (((psr) & PSR_MODE) == PSR_USR32_MODE && ((psr) & I32_bit) == 0) 126 #else 127 #define VALID_R15_PSR(r15,psr) \ 128 (((psr) & PSR_MODE) == PSR_USR32_MODE && ((psr) & IF32_bits) == 0) 129 #endif 130 #else 131 #define VALID_R15_PSR(r15,psr) \ 132 (((r15) & R15_MODE) == R15_MODE_USR && \ 133 ((r15) & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) == 0) 134 #endif 135 136 137 138 /* The address of the vector page. */ 139 extern vaddr_t vector_page; 140 #ifdef __PROG32 141 void arm32_vector_init(vaddr_t, int); 142 143 #define ARM_VEC_RESET (1 << 0) 144 #define ARM_VEC_UNDEFINED (1 << 1) 145 #define ARM_VEC_SWI (1 << 2) 146 #define ARM_VEC_PREFETCH_ABORT (1 << 3) 147 #define ARM_VEC_DATA_ABORT (1 << 4) 148 #define ARM_VEC_ADDRESS_EXCEPTION (1 << 5) 149 #define ARM_VEC_IRQ (1 << 6) 150 #define ARM_VEC_FIQ (1 << 7) 151 152 #define ARM_NVEC 8 153 #define ARM_VEC_ALL 0xffffffff 154 #endif /* __PROG32 */ 155 156 #ifndef acorn26 157 /* 158 * cpu device glue (belongs in cpuvar.h) 159 */ 160 void cpu_attach(device_t, cpuid_t); 161 #endif 162 163 /* 1 == use cpu_sleep(), 0 == don't */ 164 extern int cpu_do_powersave; 165 extern int cpu_printfataltraps; 166 extern int cpu_fpu_present; 167 extern int cpu_hwdiv_present; 168 extern int cpu_neon_present; 169 extern int cpu_simd_present; 170 extern int cpu_simdex_present; 171 extern int cpu_umull_present; 172 extern int cpu_synchprim_present; 173 174 extern int cpu_instruction_set_attributes[6]; 175 extern int cpu_memory_model_features[4]; 176 extern int cpu_processor_features[2]; 177 extern int cpu_media_and_vfp_features[2]; 178 179 extern bool arm_has_tlbiasid_p; 180 #ifdef MULTIPROCESSOR 181 extern u_int arm_cpu_max; 182 extern volatile u_int arm_cpu_hatched; 183 #endif 184 185 #if !defined(CPU_ARMV7) 186 #define CPU_IS_ARMV7_P() false 187 #elif defined(CPU_ARMV6) || defined(CPU_PRE_ARMV6) 188 extern bool cpu_armv7_p; 189 #define CPU_IS_ARMV7_P() (cpu_armv7_p) 190 #else 191 #define CPU_IS_ARMV7_P() true 192 #endif 193 #if !defined(CPU_ARMV6) 194 #define CPU_IS_ARMV6_P() false 195 #elif defined(CPU_ARMV7) || defined(CPU_PRE_ARMV6) 196 extern bool cpu_armv6_p; 197 #define CPU_IS_ARMV6_P() (cpu_armv6_p) 198 #else 199 #define CPU_IS_ARMV6_P() true 200 #endif 201 202 /* 203 * Used by the fault code to read the current instruction. 204 */ 205 static inline uint32_t 206 read_insn(vaddr_t va, bool user_p) 207 { 208 uint32_t insn; 209 if (user_p) { 210 __asm __volatile("ldrt %0, [%1]" : "=&r"(insn) : "r"(va)); 211 } else { 212 insn = *(const uint32_t *)va; 213 } 214 #if defined(__ARMEB__) && defined(_ARM_ARCH_7) 215 insn = bswap32(insn); 216 #endif 217 return insn; 218 } 219 220 /* 221 * Used by the fault code to read the current thumb instruction. 222 */ 223 static inline uint32_t 224 read_thumb_insn(vaddr_t va, bool user_p) 225 { 226 va &= ~1; 227 uint32_t insn; 228 if (user_p) { 229 #ifdef _ARM_ARCH_T2 230 __asm __volatile("ldrht %0, [%1], #0" : "=&r"(insn) : "r"(va)); 231 #else 232 __asm __volatile("ldrt %0, [%1]" : "=&r"(insn) : "r"(va & ~3)); 233 #ifdef __ARMEB__ 234 insn = (uint16_t) (insn >> (((va ^ 2) & 2) << 3)); 235 #else 236 insn = (uint16_t) (insn >> ((va & 2) << 3)); 237 #endif 238 #endif 239 } else { 240 insn = *(const uint16_t *)va; 241 } 242 #if defined(__ARMEB__) && defined(_ARM_ARCH_7) 243 insn = bswap16(insn); 244 #endif 245 return insn; 246 } 247 248 #ifndef _RUMPKERNEL 249 static inline void 250 arm_dmb(void) 251 { 252 if (CPU_IS_ARMV6_P()) 253 armreg_dmb_write(0); 254 else if (CPU_IS_ARMV7_P()) 255 __asm __volatile("dmb" ::: "memory"); 256 } 257 258 static inline void 259 arm_dsb(void) 260 { 261 if (CPU_IS_ARMV6_P()) 262 armreg_dsb_write(0); 263 else if (CPU_IS_ARMV7_P()) 264 __asm __volatile("dsb" ::: "memory"); 265 } 266 267 static inline void 268 arm_isb(void) 269 { 270 if (CPU_IS_ARMV6_P()) 271 armreg_isb_write(0); 272 else if (CPU_IS_ARMV7_P()) 273 __asm __volatile("isb" ::: "memory"); 274 } 275 #endif 276 277 /* 278 * Random cruft 279 */ 280 281 struct lwp; 282 283 /* cpu.c */ 284 void identify_arm_cpu(device_t, struct cpu_info *); 285 286 /* cpuswitch.S */ 287 struct pcb; 288 void savectx(struct pcb *); 289 290 /* ast.c */ 291 void userret(struct lwp *); 292 293 /* *_machdep.c */ 294 void bootsync(void); 295 296 /* fault.c */ 297 int badaddr_read(void *, size_t, void *); 298 299 /* syscall.c */ 300 void swi_handler(trapframe_t *); 301 302 /* arm_machdep.c */ 303 void ucas_ras_check(trapframe_t *); 304 305 /* vfp_init.c */ 306 void vfp_attach(struct cpu_info *); 307 void vfp_discardcontext(bool); 308 void vfp_savecontext(void); 309 void vfp_kernel_acquire(void); 310 void vfp_kernel_release(void); 311 bool vfp_used_p(void); 312 extern const pcu_ops_t arm_vfp_ops; 313 314 #endif /* !_LOCORE */ 315 316 #endif /* !_ARM_LOCORE_H_ */ 317
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