1 /* 2 * include/asm-s390/processor.h 3 * 4 * S390 version 5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com), 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "include/asm-i386/processor.h" 10 * Copyright (C) 1994, Linus Torvalds 11 */ 12 13 #ifndef __ASM_S390_PROCESSOR_H 14 #define __ASM_S390_PROCESSOR_H 15 16 #include <linux/linkage.h> 17 #include <asm/cpu.h> 18 #include <asm/page.h> 19 #include <asm/ptrace.h> 20 #include <asm/setup.h> 21 22 #ifdef __KERNEL__ 23 /* 24 * Default implementation of macro that returns current 25 * instruction pointer ("program counter"). 26 */ 27 #define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; }) 28 29 static inline void get_cpu_id(struct cpuid *ptr) 30 { 31 asm volatile("stidp %0" : "=Q" (*ptr)); 32 } 33 34 extern void s390_adjust_jiffies(void); 35 extern void print_cpu_info(void); 36 extern int get_cpu_capability(unsigned int *); 37 38 /* 39 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit. 40 */ 41 #ifndef __s390x__ 42 43 #define TASK_SIZE (1UL << 31) 44 #define TASK_UNMAPPED_BASE (1UL << 30) 45 46 #else /* __s390x__ */ 47 48 #define TASK_SIZE_OF(tsk) ((tsk)->mm->context.asce_limit) 49 #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ 50 (1UL << 30) : (1UL << 41)) 51 #define TASK_SIZE TASK_SIZE_OF(current) 52 53 #endif /* __s390x__ */ 54 55 #ifdef __KERNEL__ 56 57 #ifndef __s390x__ 58 #define STACK_TOP (1UL << 31) 59 #define STACK_TOP_MAX (1UL << 31) 60 #else /* __s390x__ */ 61 #define STACK_TOP (1UL << (test_thread_flag(TIF_31BIT) ? 31:42)) 62 #define STACK_TOP_MAX (1UL << 42) 63 #endif /* __s390x__ */ 64 65 66 #endif 67 68 #define HAVE_ARCH_PICK_MMAP_LAYOUT 69 70 typedef struct { 71 __u32 ar4; 72 } mm_segment_t; 73 74 /* 75 * Thread structure 76 */ 77 struct thread_struct { 78 s390_fp_regs fp_regs; 79 unsigned int acrs[NUM_ACRS]; 80 unsigned long ksp; /* kernel stack pointer */ 81 mm_segment_t mm_segment; 82 unsigned long prot_addr; /* address of protection-excep. */ 83 unsigned int trap_no; 84 per_struct per_info; 85 /* pfault_wait is used to block the process on a pfault event */ 86 unsigned long pfault_wait; 87 }; 88 89 typedef struct thread_struct thread_struct; 90 91 /* 92 * Stack layout of a C stack frame. 93 */ 94 #ifndef __PACK_STACK 95 struct stack_frame { 96 unsigned long back_chain; 97 unsigned long empty1[5]; 98 unsigned long gprs[10]; 99 unsigned int empty2[8]; 100 }; 101 #else 102 struct stack_frame { 103 unsigned long empty1[5]; 104 unsigned int empty2[8]; 105 unsigned long gprs[10]; 106 unsigned long back_chain; 107 }; 108 #endif 109 110 #define ARCH_MIN_TASKALIGN 8 111 112 #define INIT_THREAD { \ 113 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ 114 } 115 116 /* 117 * Do necessary setup to start up a new thread. 118 */ 119 #define start_thread(regs, new_psw, new_stackp) do { \ 120 set_fs(USER_DS); \ 121 regs->psw.mask = psw_user_bits; \ 122 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 123 regs->gprs[15] = new_stackp; \ 124 } while (0) 125 126 #define start_thread31(regs, new_psw, new_stackp) do { \ 127 set_fs(USER_DS); \ 128 regs->psw.mask = psw_user32_bits; \ 129 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 130 regs->gprs[15] = new_stackp; \ 131 crst_table_downgrade(current->mm, 1UL << 31); \ 132 } while (0) 133 134 /* Forward declaration, a strange C thing */ 135 struct task_struct; 136 struct mm_struct; 137 struct seq_file; 138 139 /* Free all resources held by a thread. */ 140 extern void release_thread(struct task_struct *); 141 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 142 143 /* Prepare to copy thread state - unlazy all lazy status */ 144 #define prepare_to_copy(tsk) do { } while (0) 145 146 /* 147 * Return saved PC of a blocked thread. 148 */ 149 extern unsigned long thread_saved_pc(struct task_struct *t); 150 151 /* 152 * Print register of task into buffer. Used in fs/proc/array.c. 153 */ 154 extern void task_show_regs(struct seq_file *m, struct task_struct *task); 155 156 extern void show_code(struct pt_regs *regs); 157 158 unsigned long get_wchan(struct task_struct *p); 159 #define task_pt_regs(tsk) ((struct pt_regs *) \ 160 (task_stack_page(tsk) + THREAD_SIZE) - 1) 161 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 162 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 163 164 /* 165 * Give up the time slice of the virtual PU. 166 */ 167 static inline void cpu_relax(void) 168 { 169 if (MACHINE_HAS_DIAG44) 170 asm volatile("diag 0,0,68"); 171 barrier(); 172 } 173 174 static inline void psw_set_key(unsigned int key) 175 { 176 asm volatile("spka 0(%0)" : : "d" (key)); 177 } 178 179 /* 180 * Set PSW to specified value. 181 */ 182 static inline void __load_psw(psw_t psw) 183 { 184 #ifndef __s390x__ 185 asm volatile("lpsw %0" : : "Q" (psw) : "cc"); 186 #else 187 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 188 #endif 189 } 190 191 /* 192 * Set PSW mask to specified value, while leaving the 193 * PSW addr pointing to the next instruction. 194 */ 195 196 static inline void __load_psw_mask (unsigned long mask) 197 { 198 unsigned long addr; 199 psw_t psw; 200 201 psw.mask = mask; 202 203 #ifndef __s390x__ 204 asm volatile( 205 " basr %0,0\n" 206 "0: ahi %0,1f-0b\n" 207 " st %0,%O1+4(%R1)\n" 208 " lpsw %1\n" 209 "1:" 210 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 211 #else /* __s390x__ */ 212 asm volatile( 213 " larl %0,1f\n" 214 " stg %0,%O1+8(%R1)\n" 215 " lpswe %1\n" 216 "1:" 217 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 218 #endif /* __s390x__ */ 219 } 220 221 /* 222 * Function to stop a processor until an interruption occurred 223 */ 224 static inline void enabled_wait(void) 225 { 226 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | 227 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); 228 } 229 230 /* 231 * Function to drop a processor into disabled wait state 232 */ 233 234 static inline void ATTRIB_NORET disabled_wait(unsigned long code) 235 { 236 unsigned long ctl_buf; 237 psw_t dw_psw; 238 239 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; 240 dw_psw.addr = code; 241 /* 242 * Store status and then load disabled wait psw, 243 * the processor is dead afterwards 244 */ 245 #ifndef __s390x__ 246 asm volatile( 247 " stctl 0,0,0(%2)\n" 248 " ni 0(%2),0xef\n" /* switch off protection */ 249 " lctl 0,0,0(%2)\n" 250 " stpt 0xd8\n" /* store timer */ 251 " stckc 0xe0\n" /* store clock comparator */ 252 " stpx 0x108\n" /* store prefix register */ 253 " stam 0,15,0x120\n" /* store access registers */ 254 " std 0,0x160\n" /* store f0 */ 255 " std 2,0x168\n" /* store f2 */ 256 " std 4,0x170\n" /* store f4 */ 257 " std 6,0x178\n" /* store f6 */ 258 " stm 0,15,0x180\n" /* store general registers */ 259 " stctl 0,15,0x1c0\n" /* store control registers */ 260 " oi 0x1c0,0x10\n" /* fake protection bit */ 261 " lpsw 0(%1)" 262 : "=m" (ctl_buf) 263 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); 264 #else /* __s390x__ */ 265 asm volatile( 266 " stctg 0,0,0(%2)\n" 267 " ni 4(%2),0xef\n" /* switch off protection */ 268 " lctlg 0,0,0(%2)\n" 269 " lghi 1,0x1000\n" 270 " stpt 0x328(1)\n" /* store timer */ 271 " stckc 0x330(1)\n" /* store clock comparator */ 272 " stpx 0x318(1)\n" /* store prefix register */ 273 " stam 0,15,0x340(1)\n"/* store access registers */ 274 " stfpc 0x31c(1)\n" /* store fpu control */ 275 " std 0,0x200(1)\n" /* store f0 */ 276 " std 1,0x208(1)\n" /* store f1 */ 277 " std 2,0x210(1)\n" /* store f2 */ 278 " std 3,0x218(1)\n" /* store f3 */ 279 " std 4,0x220(1)\n" /* store f4 */ 280 " std 5,0x228(1)\n" /* store f5 */ 281 " std 6,0x230(1)\n" /* store f6 */ 282 " std 7,0x238(1)\n" /* store f7 */ 283 " std 8,0x240(1)\n" /* store f8 */ 284 " std 9,0x248(1)\n" /* store f9 */ 285 " std 10,0x250(1)\n" /* store f10 */ 286 " std 11,0x258(1)\n" /* store f11 */ 287 " std 12,0x260(1)\n" /* store f12 */ 288 " std 13,0x268(1)\n" /* store f13 */ 289 " std 14,0x270(1)\n" /* store f14 */ 290 " std 15,0x278(1)\n" /* store f15 */ 291 " stmg 0,15,0x280(1)\n"/* store general registers */ 292 " stctg 0,15,0x380(1)\n"/* store control registers */ 293 " oi 0x384(1),0x10\n"/* fake protection bit */ 294 " lpswe 0(%1)" 295 : "=m" (ctl_buf) 296 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); 297 #endif /* __s390x__ */ 298 while (1); 299 } 300 301 /* 302 * Basic Machine Check/Program Check Handler. 303 */ 304 305 extern void s390_base_mcck_handler(void); 306 extern void s390_base_pgm_handler(void); 307 extern void s390_base_ext_handler(void); 308 309 extern void (*s390_base_mcck_handler_fn)(void); 310 extern void (*s390_base_pgm_handler_fn)(void); 311 extern void (*s390_base_ext_handler_fn)(void); 312 313 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 314 315 #endif 316 317 /* 318 * Helper macro for exception table entries 319 */ 320 #ifndef __s390x__ 321 #define EX_TABLE(_fault,_target) \ 322 ".section __ex_table,\"a\"\n" \ 323 " .align 4\n" \ 324 " .long " #_fault "," #_target "\n" \ 325 ".previous\n" 326 #else 327 #define EX_TABLE(_fault,_target) \ 328 ".section __ex_table,\"a\"\n" \ 329 " .align 8\n" \ 330 " .quad " #_fault "," #_target "\n" \ 331 ".previous\n" 332 #endif 333 334 #endif /* __ASM_S390_PROCESSOR_H */ 335