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 #ifndef __ASSEMBLY__ 15 16 #include <linux/linkage.h> 17 #include <linux/irqflags.h> 18 #include <asm/cpu.h> 19 #include <asm/page.h> 20 #include <asm/ptrace.h> 21 #include <asm/setup.h> 22 #include <asm/runtime_instr.h> 23 24 /* 25 * Default implementation of macro that returns current 26 * instruction pointer ("program counter"). 27 */ 28 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) 29 30 static inline void get_cpu_id(struct cpuid *ptr) 31 { 32 asm volatile("stidp %0" : "=Q" (*ptr)); 33 } 34 35 extern void s390_adjust_jiffies(void); 36 extern const struct seq_operations cpuinfo_op; 37 extern int sysctl_ieee_emulation_warnings; 38 extern void execve_tail(void); 39 40 /* 41 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. 42 */ 43 #ifndef CONFIG_64BIT 44 45 #define TASK_SIZE (1UL << 31) 46 #define TASK_UNMAPPED_BASE (1UL << 30) 47 48 #else /* CONFIG_64BIT */ 49 50 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) 51 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ 52 (1UL << 30) : (1UL << 41)) 53 #define TASK_SIZE TASK_SIZE_OF(current) 54 55 #endif /* CONFIG_64BIT */ 56 57 #ifndef CONFIG_64BIT 58 #define STACK_TOP (1UL << 31) 59 #define STACK_TOP_MAX (1UL << 31) 60 #else /* CONFIG_64BIT */ 61 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) 62 #define STACK_TOP_MAX (1UL << 42) 63 #endif /* CONFIG_64BIT */ 64 65 #define HAVE_ARCH_PICK_MMAP_LAYOUT 66 67 typedef struct { 68 __u32 ar4; 69 } mm_segment_t; 70 71 /* 72 * Thread structure 73 */ 74 struct thread_struct { 75 s390_fp_regs fp_regs; 76 unsigned int acrs[NUM_ACRS]; 77 unsigned long ksp; /* kernel stack pointer */ 78 mm_segment_t mm_segment; 79 unsigned long gmap_addr; /* address of last gmap fault. */ 80 struct per_regs per_user; /* User specified PER registers */ 81 struct per_event per_event; /* Cause of the last PER trap */ 82 unsigned long per_flags; /* Flags to control debug behavior */ 83 /* pfault_wait is used to block the process on a pfault event */ 84 unsigned long pfault_wait; 85 struct list_head list; 86 /* cpu runtime instrumentation */ 87 struct runtime_instr_cb *ri_cb; 88 int ri_signum; 89 #ifdef CONFIG_64BIT 90 unsigned char trap_tdb[256]; /* Transaction abort diagnose block */ 91 #endif 92 }; 93 94 #define PER_FLAG_NO_TE 1UL /* Flag to disable transactions. */ 95 96 typedef struct thread_struct thread_struct; 97 98 /* 99 * Stack layout of a C stack frame. 100 */ 101 #ifndef __PACK_STACK 102 struct stack_frame { 103 unsigned long back_chain; 104 unsigned long empty1[5]; 105 unsigned long gprs[10]; 106 unsigned int empty2[8]; 107 }; 108 #else 109 struct stack_frame { 110 unsigned long empty1[5]; 111 unsigned int empty2[8]; 112 unsigned long gprs[10]; 113 unsigned long back_chain; 114 }; 115 #endif 116 117 #define ARCH_MIN_TASKALIGN 8 118 119 #define INIT_THREAD { \ 120 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ 121 } 122 123 /* 124 * Do necessary setup to start up a new thread. 125 */ 126 #define start_thread(regs, new_psw, new_stackp) do { \ 127 regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \ 128 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 129 regs->gprs[15] = new_stackp; \ 130 execve_tail(); \ 131 } while (0) 132 133 #define start_thread31(regs, new_psw, new_stackp) do { \ 134 regs->psw.mask = psw_user_bits | PSW_MASK_BA; \ 135 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 136 regs->gprs[15] = new_stackp; \ 137 __tlb_flush_mm(current->mm); \ 138 crst_table_downgrade(current->mm, 1UL << 31); \ 139 update_mm(current->mm, current); \ 140 execve_tail(); \ 141 } while (0) 142 143 /* Forward declaration, a strange C thing */ 144 struct task_struct; 145 struct mm_struct; 146 struct seq_file; 147 148 #ifdef CONFIG_64BIT 149 extern void show_cacheinfo(struct seq_file *m); 150 #else 151 static inline void show_cacheinfo(struct seq_file *m) { } 152 #endif 153 154 /* Free all resources held by a thread. */ 155 extern void release_thread(struct task_struct *); 156 157 /* 158 * Return saved PC of a blocked thread. 159 */ 160 extern unsigned long thread_saved_pc(struct task_struct *t); 161 162 extern void show_code(struct pt_regs *regs); 163 extern void print_fn_code(unsigned char *code, unsigned long len); 164 extern int insn_to_mnemonic(unsigned char *instruction, char buf[8]); 165 166 unsigned long get_wchan(struct task_struct *p); 167 #define task_pt_regs(tsk) ((struct pt_regs *) \ 168 (task_stack_page(tsk) + THREAD_SIZE) - 1) 169 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 170 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 171 172 static inline unsigned short stap(void) 173 { 174 unsigned short cpu_address; 175 176 asm volatile("stap %0" : "=m" (cpu_address)); 177 return cpu_address; 178 } 179 180 /* 181 * Give up the time slice of the virtual PU. 182 */ 183 static inline void cpu_relax(void) 184 { 185 if (MACHINE_HAS_DIAG44) 186 asm volatile("diag 0,0,68"); 187 barrier(); 188 } 189 190 static inline void psw_set_key(unsigned int key) 191 { 192 asm volatile("spka 0(%0)" : : "d" (key)); 193 } 194 195 /* 196 * Set PSW to specified value. 197 */ 198 static inline void __load_psw(psw_t psw) 199 { 200 #ifndef CONFIG_64BIT 201 asm volatile("lpsw %0" : : "Q" (psw) : "cc"); 202 #else 203 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 204 #endif 205 } 206 207 /* 208 * Set PSW mask to specified value, while leaving the 209 * PSW addr pointing to the next instruction. 210 */ 211 static inline void __load_psw_mask (unsigned long mask) 212 { 213 unsigned long addr; 214 psw_t psw; 215 216 psw.mask = mask; 217 218 #ifndef CONFIG_64BIT 219 asm volatile( 220 " basr %0,0\n" 221 "0: ahi %0,1f-0b\n" 222 " st %0,%O1+4(%R1)\n" 223 " lpsw %1\n" 224 "1:" 225 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 226 #else /* CONFIG_64BIT */ 227 asm volatile( 228 " larl %0,1f\n" 229 " stg %0,%O1+8(%R1)\n" 230 " lpswe %1\n" 231 "1:" 232 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 233 #endif /* CONFIG_64BIT */ 234 } 235 236 /* 237 * Rewind PSW instruction address by specified number of bytes. 238 */ 239 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc) 240 { 241 #ifndef CONFIG_64BIT 242 if (psw.addr & PSW_ADDR_AMODE) 243 /* 31 bit mode */ 244 return (psw.addr - ilc) | PSW_ADDR_AMODE; 245 /* 24 bit mode */ 246 return (psw.addr - ilc) & ((1UL << 24) - 1); 247 #else 248 unsigned long mask; 249 250 mask = (psw.mask & PSW_MASK_EA) ? -1UL : 251 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : 252 (1UL << 24) - 1; 253 return (psw.addr - ilc) & mask; 254 #endif 255 } 256 257 /* 258 * Function to drop a processor into disabled wait state 259 */ 260 static inline void __noreturn disabled_wait(unsigned long code) 261 { 262 unsigned long ctl_buf; 263 psw_t dw_psw; 264 265 dw_psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; 266 dw_psw.addr = code; 267 /* 268 * Store status and then load disabled wait psw, 269 * the processor is dead afterwards 270 */ 271 #ifndef CONFIG_64BIT 272 asm volatile( 273 " stctl 0,0,0(%2)\n" 274 " ni 0(%2),0xef\n" /* switch off protection */ 275 " lctl 0,0,0(%2)\n" 276 " stpt 0xd8\n" /* store timer */ 277 " stckc 0xe0\n" /* store clock comparator */ 278 " stpx 0x108\n" /* store prefix register */ 279 " stam 0,15,0x120\n" /* store access registers */ 280 " std 0,0x160\n" /* store f0 */ 281 " std 2,0x168\n" /* store f2 */ 282 " std 4,0x170\n" /* store f4 */ 283 " std 6,0x178\n" /* store f6 */ 284 " stm 0,15,0x180\n" /* store general registers */ 285 " stctl 0,15,0x1c0\n" /* store control registers */ 286 " oi 0x1c0,0x10\n" /* fake protection bit */ 287 " lpsw 0(%1)" 288 : "=m" (ctl_buf) 289 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); 290 #else /* CONFIG_64BIT */ 291 asm volatile( 292 " stctg 0,0,0(%2)\n" 293 " ni 4(%2),0xef\n" /* switch off protection */ 294 " lctlg 0,0,0(%2)\n" 295 " lghi 1,0x1000\n" 296 " stpt 0x328(1)\n" /* store timer */ 297 " stckc 0x330(1)\n" /* store clock comparator */ 298 " stpx 0x318(1)\n" /* store prefix register */ 299 " stam 0,15,0x340(1)\n"/* store access registers */ 300 " stfpc 0x31c(1)\n" /* store fpu control */ 301 " std 0,0x200(1)\n" /* store f0 */ 302 " std 1,0x208(1)\n" /* store f1 */ 303 " std 2,0x210(1)\n" /* store f2 */ 304 " std 3,0x218(1)\n" /* store f3 */ 305 " std 4,0x220(1)\n" /* store f4 */ 306 " std 5,0x228(1)\n" /* store f5 */ 307 " std 6,0x230(1)\n" /* store f6 */ 308 " std 7,0x238(1)\n" /* store f7 */ 309 " std 8,0x240(1)\n" /* store f8 */ 310 " std 9,0x248(1)\n" /* store f9 */ 311 " std 10,0x250(1)\n" /* store f10 */ 312 " std 11,0x258(1)\n" /* store f11 */ 313 " std 12,0x260(1)\n" /* store f12 */ 314 " std 13,0x268(1)\n" /* store f13 */ 315 " std 14,0x270(1)\n" /* store f14 */ 316 " std 15,0x278(1)\n" /* store f15 */ 317 " stmg 0,15,0x280(1)\n"/* store general registers */ 318 " stctg 0,15,0x380(1)\n"/* store control registers */ 319 " oi 0x384(1),0x10\n"/* fake protection bit */ 320 " lpswe 0(%1)" 321 : "=m" (ctl_buf) 322 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); 323 #endif /* CONFIG_64BIT */ 324 while (1); 325 } 326 327 /* 328 * Use to set psw mask except for the first byte which 329 * won't be changed by this function. 330 */ 331 static inline void 332 __set_psw_mask(unsigned long mask) 333 { 334 __load_psw_mask(mask | (arch_local_save_flags() & ~(-1UL >> 8))); 335 } 336 337 #define local_mcck_enable() \ 338 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK) 339 #define local_mcck_disable() \ 340 __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT) 341 342 /* 343 * Basic Machine Check/Program Check Handler. 344 */ 345 346 extern void s390_base_mcck_handler(void); 347 extern void s390_base_pgm_handler(void); 348 extern void s390_base_ext_handler(void); 349 350 extern void (*s390_base_mcck_handler_fn)(void); 351 extern void (*s390_base_pgm_handler_fn)(void); 352 extern void (*s390_base_ext_handler_fn)(void); 353 354 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 355 356 extern int memcpy_real(void *, void *, size_t); 357 extern void memcpy_absolute(void *, void *, size_t); 358 359 #define mem_assign_absolute(dest, val) { \ 360 __typeof__(dest) __tmp = (val); \ 361 \ 362 BUILD_BUG_ON(sizeof(__tmp) != sizeof(val)); \ 363 memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ 364 } 365 366 /* 367 * Helper macro for exception table entries 368 */ 369 #define EX_TABLE(_fault, _target) \ 370 ".section __ex_table,\"a\"\n" \ 371 ".align 4\n" \ 372 ".long (" #_fault ") - .\n" \ 373 ".long (" #_target ") - .\n" \ 374 ".previous\n" 375 376 #else /* __ASSEMBLY__ */ 377 378 #define EX_TABLE(_fault, _target) \ 379 .section __ex_table,"a" ; \ 380 .align 4 ; \ 381 .long (_fault) - . ; \ 382 .long (_target) - . ; \ 383 .previous 384 385 #endif /* __ASSEMBLY__ */ 386 387 #endif /* __ASM_S390_PROCESSOR_H */ 388