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