1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999 4 * Author(s): Hartmut Penner (hp@de.ibm.com), 5 * Martin Schwidefsky (schwidefsky@de.ibm.com) 6 * 7 * Derived from "include/asm-i386/processor.h" 8 * Copyright (C) 1994, Linus Torvalds 9 */ 10 11 #ifndef __ASM_S390_PROCESSOR_H 12 #define __ASM_S390_PROCESSOR_H 13 14 #include <linux/const.h> 15 16 #define CIF_MCCK_PENDING 0 /* machine check handling is pending */ 17 #define CIF_ASCE 1 /* user asce needs fixup / uaccess */ 18 #define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */ 19 #define CIF_FPU 3 /* restore FPU registers */ 20 #define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */ 21 22 #define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING) 23 #define _CIF_ASCE _BITUL(CIF_ASCE) 24 #define _CIF_NOHZ_DELAY _BITUL(CIF_NOHZ_DELAY) 25 #define _CIF_FPU _BITUL(CIF_FPU) 26 #define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ) 27 28 #ifndef __ASSEMBLY__ 29 30 #include <linux/linkage.h> 31 #include <linux/irqflags.h> 32 #include <asm/cpu.h> 33 #include <asm/page.h> 34 #include <asm/ptrace.h> 35 #include <asm/setup.h> 36 #include <asm/runtime_instr.h> 37 #include <asm/fpu/types.h> 38 #include <asm/fpu/internal.h> 39 40 static inline void set_cpu_flag(int flag) 41 { 42 S390_lowcore.cpu_flags |= (1UL << flag); 43 } 44 45 static inline void clear_cpu_flag(int flag) 46 { 47 S390_lowcore.cpu_flags &= ~(1UL << flag); 48 } 49 50 static inline int test_cpu_flag(int flag) 51 { 52 return !!(S390_lowcore.cpu_flags & (1UL << flag)); 53 } 54 55 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY) 56 57 /* 58 * Default implementation of macro that returns current 59 * instruction pointer ("program counter"). 60 */ 61 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) 62 63 static inline void get_cpu_id(struct cpuid *ptr) 64 { 65 asm volatile("stidp %0" : "=Q" (*ptr)); 66 } 67 68 extern void s390_adjust_jiffies(void); 69 extern const struct seq_operations cpuinfo_op; 70 extern int sysctl_ieee_emulation_warnings; 71 extern void execve_tail(void); 72 73 /* 74 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. 75 */ 76 77 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) 78 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ 79 (1UL << 30) : (1UL << 41)) 80 #define TASK_SIZE TASK_SIZE_OF(current) 81 #define TASK_MAX_SIZE (1UL << 53) 82 83 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) 84 #define STACK_TOP_MAX (1UL << 42) 85 86 #define HAVE_ARCH_PICK_MMAP_LAYOUT 87 88 typedef struct { 89 __u32 ar4; 90 } mm_segment_t; 91 92 /* 93 * Thread structure 94 */ 95 struct thread_struct { 96 struct fpu fpu; /* FP and VX register save area */ 97 unsigned int acrs[NUM_ACRS]; 98 unsigned long ksp; /* kernel stack pointer */ 99 mm_segment_t mm_segment; 100 unsigned long gmap_addr; /* address of last gmap fault. */ 101 unsigned int gmap_pfault; /* signal of a pending guest pfault */ 102 struct per_regs per_user; /* User specified PER registers */ 103 struct per_event per_event; /* Cause of the last PER trap */ 104 unsigned long per_flags; /* Flags to control debug behavior */ 105 /* pfault_wait is used to block the process on a pfault event */ 106 unsigned long pfault_wait; 107 struct list_head list; 108 /* cpu runtime instrumentation */ 109 struct runtime_instr_cb *ri_cb; 110 unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ 111 }; 112 113 /* Flag to disable transactions. */ 114 #define PER_FLAG_NO_TE 1UL 115 /* Flag to enable random transaction aborts. */ 116 #define PER_FLAG_TE_ABORT_RAND 2UL 117 /* Flag to specify random transaction abort mode: 118 * - abort each transaction at a random instruction before TEND if set. 119 * - abort random transactions at a random instruction if cleared. 120 */ 121 #define PER_FLAG_TE_ABORT_RAND_TEND 4UL 122 123 typedef struct thread_struct thread_struct; 124 125 /* 126 * Stack layout of a C stack frame. 127 */ 128 #ifndef __PACK_STACK 129 struct stack_frame { 130 unsigned long back_chain; 131 unsigned long empty1[5]; 132 unsigned long gprs[10]; 133 unsigned int empty2[8]; 134 }; 135 #else 136 struct stack_frame { 137 unsigned long empty1[5]; 138 unsigned int empty2[8]; 139 unsigned long gprs[10]; 140 unsigned long back_chain; 141 }; 142 #endif 143 144 #define ARCH_MIN_TASKALIGN 8 145 146 extern __vector128 init_task_fpu_regs[__NUM_VXRS]; 147 #define INIT_THREAD { \ 148 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ 149 .fpu.regs = (void *)&init_task_fpu_regs, \ 150 } 151 152 /* 153 * Do necessary setup to start up a new thread. 154 */ 155 #define start_thread(regs, new_psw, new_stackp) do { \ 156 regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \ 157 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 158 regs->gprs[15] = new_stackp; \ 159 execve_tail(); \ 160 } while (0) 161 162 #define start_thread31(regs, new_psw, new_stackp) do { \ 163 regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \ 164 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 165 regs->gprs[15] = new_stackp; \ 166 crst_table_downgrade(current->mm, 1UL << 31); \ 167 execve_tail(); \ 168 } while (0) 169 170 /* Forward declaration, a strange C thing */ 171 struct task_struct; 172 struct mm_struct; 173 struct seq_file; 174 175 void show_cacheinfo(struct seq_file *m); 176 177 /* Free all resources held by a thread. */ 178 extern void release_thread(struct task_struct *); 179 180 /* 181 * Return saved PC of a blocked thread. 182 */ 183 extern unsigned long thread_saved_pc(struct task_struct *t); 184 185 unsigned long get_wchan(struct task_struct *p); 186 #define task_pt_regs(tsk) ((struct pt_regs *) \ 187 (task_stack_page(tsk) + THREAD_SIZE) - 1) 188 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 189 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 190 191 /* Has task runtime instrumentation enabled ? */ 192 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb) 193 194 static inline unsigned short stap(void) 195 { 196 unsigned short cpu_address; 197 198 asm volatile("stap %0" : "=m" (cpu_address)); 199 return cpu_address; 200 } 201 202 /* 203 * Give up the time slice of the virtual PU. 204 */ 205 void cpu_relax(void); 206 207 #define cpu_relax_lowlatency() barrier() 208 209 static inline void psw_set_key(unsigned int key) 210 { 211 asm volatile("spka 0(%0)" : : "d" (key)); 212 } 213 214 /* 215 * Set PSW to specified value. 216 */ 217 static inline void __load_psw(psw_t psw) 218 { 219 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 220 } 221 222 /* 223 * Set PSW mask to specified value, while leaving the 224 * PSW addr pointing to the next instruction. 225 */ 226 static inline void __load_psw_mask(unsigned long mask) 227 { 228 unsigned long addr; 229 psw_t psw; 230 231 psw.mask = mask; 232 233 asm volatile( 234 " larl %0,1f\n" 235 " stg %0,%O1+8(%R1)\n" 236 " lpswe %1\n" 237 "1:" 238 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 239 } 240 241 /* 242 * Extract current PSW mask 243 */ 244 static inline unsigned long __extract_psw(void) 245 { 246 unsigned int reg1, reg2; 247 248 asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2)); 249 return (((unsigned long) reg1) << 32) | ((unsigned long) reg2); 250 } 251 252 static inline void local_mcck_enable(void) 253 { 254 __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); 255 } 256 257 static inline void local_mcck_disable(void) 258 { 259 __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK); 260 } 261 262 /* 263 * Rewind PSW instruction address by specified number of bytes. 264 */ 265 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) 266 { 267 unsigned long mask; 268 269 mask = (psw.mask & PSW_MASK_EA) ? -1UL : 270 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : 271 (1UL << 24) - 1; 272 return (psw.addr - ilc) & mask; 273 } 274 275 /* 276 * Function to stop a processor until the next interrupt occurs 277 */ 278 void enabled_wait(void); 279 280 /* 281 * Function to drop a processor into disabled wait state 282 */ 283 static inline void __noreturn disabled_wait(unsigned long code) 284 { 285 psw_t psw; 286 287 psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; 288 psw.addr = code; 289 __load_psw(psw); 290 while (1); 291 } 292 293 /* 294 * Basic Machine Check/Program Check Handler. 295 */ 296 297 extern void s390_base_mcck_handler(void); 298 extern void s390_base_pgm_handler(void); 299 extern void s390_base_ext_handler(void); 300 301 extern void (*s390_base_mcck_handler_fn)(void); 302 extern void (*s390_base_pgm_handler_fn)(void); 303 extern void (*s390_base_ext_handler_fn)(void); 304 305 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 306 307 extern int memcpy_real(void *, void *, size_t); 308 extern void memcpy_absolute(void *, void *, size_t); 309 310 #define mem_assign_absolute(dest, val) { \ 311 __typeof__(dest) __tmp = (val); \ 312 \ 313 BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \ 314 memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ 315 } 316 317 #endif /* __ASSEMBLY__ */ 318 319 #endif /* __ASM_S390_PROCESSOR_H */ 320