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 unsigned long gmap_addr; /* address of last gmap fault. */ 84 struct per_regs per_user; /* User specified PER registers */ 85 struct per_event per_event; /* Cause of the last PER trap */ 86 /* pfault_wait is used to block the process on a pfault event */ 87 unsigned long pfault_wait; 88 struct list_head list; 89 }; 90 91 typedef struct thread_struct thread_struct; 92 93 /* 94 * Stack layout of a C stack frame. 95 */ 96 #ifndef __PACK_STACK 97 struct stack_frame { 98 unsigned long back_chain; 99 unsigned long empty1[5]; 100 unsigned long gprs[10]; 101 unsigned int empty2[8]; 102 }; 103 #else 104 struct stack_frame { 105 unsigned long empty1[5]; 106 unsigned int empty2[8]; 107 unsigned long gprs[10]; 108 unsigned long back_chain; 109 }; 110 #endif 111 112 #define ARCH_MIN_TASKALIGN 8 113 114 #define INIT_THREAD { \ 115 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ 116 } 117 118 /* 119 * Do necessary setup to start up a new thread. 120 */ 121 #define start_thread(regs, new_psw, new_stackp) do { \ 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 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 extern void show_code(struct pt_regs *regs); 152 153 unsigned long get_wchan(struct task_struct *p); 154 #define task_pt_regs(tsk) ((struct pt_regs *) \ 155 (task_stack_page(tsk) + THREAD_SIZE) - 1) 156 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 157 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 158 159 /* 160 * Give up the time slice of the virtual PU. 161 */ 162 static inline void cpu_relax(void) 163 { 164 if (MACHINE_HAS_DIAG44) 165 asm volatile("diag 0,0,68"); 166 barrier(); 167 } 168 169 static inline void psw_set_key(unsigned int key) 170 { 171 asm volatile("spka 0(%0)" : : "d" (key)); 172 } 173 174 /* 175 * Set PSW to specified value. 176 */ 177 static inline void __load_psw(psw_t psw) 178 { 179 #ifndef __s390x__ 180 asm volatile("lpsw %0" : : "Q" (psw) : "cc"); 181 #else 182 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 183 #endif 184 } 185 186 /* 187 * Set PSW mask to specified value, while leaving the 188 * PSW addr pointing to the next instruction. 189 */ 190 191 static inline void __load_psw_mask (unsigned long mask) 192 { 193 unsigned long addr; 194 psw_t psw; 195 196 psw.mask = mask; 197 198 #ifndef __s390x__ 199 asm volatile( 200 " basr %0,0\n" 201 "0: ahi %0,1f-0b\n" 202 " st %0,%O1+4(%R1)\n" 203 " lpsw %1\n" 204 "1:" 205 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 206 #else /* __s390x__ */ 207 asm volatile( 208 " larl %0,1f\n" 209 " stg %0,%O1+8(%R1)\n" 210 " lpswe %1\n" 211 "1:" 212 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 213 #endif /* __s390x__ */ 214 } 215 216 /* 217 * Function to stop a processor until an interruption occurred 218 */ 219 static inline void enabled_wait(void) 220 { 221 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | 222 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); 223 } 224 225 /* 226 * Function to drop a processor into disabled wait state 227 */ 228 229 static inline void ATTRIB_NORET disabled_wait(unsigned long code) 230 { 231 unsigned long ctl_buf; 232 psw_t dw_psw; 233 234 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; 235 dw_psw.addr = code; 236 /* 237 * Store status and then load disabled wait psw, 238 * the processor is dead afterwards 239 */ 240 #ifndef __s390x__ 241 asm volatile( 242 " stctl 0,0,0(%2)\n" 243 " ni 0(%2),0xef\n" /* switch off protection */ 244 " lctl 0,0,0(%2)\n" 245 " stpt 0xd8\n" /* store timer */ 246 " stckc 0xe0\n" /* store clock comparator */ 247 " stpx 0x108\n" /* store prefix register */ 248 " stam 0,15,0x120\n" /* store access registers */ 249 " std 0,0x160\n" /* store f0 */ 250 " std 2,0x168\n" /* store f2 */ 251 " std 4,0x170\n" /* store f4 */ 252 " std 6,0x178\n" /* store f6 */ 253 " stm 0,15,0x180\n" /* store general registers */ 254 " stctl 0,15,0x1c0\n" /* store control registers */ 255 " oi 0x1c0,0x10\n" /* fake protection bit */ 256 " lpsw 0(%1)" 257 : "=m" (ctl_buf) 258 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); 259 #else /* __s390x__ */ 260 asm volatile( 261 " stctg 0,0,0(%2)\n" 262 " ni 4(%2),0xef\n" /* switch off protection */ 263 " lctlg 0,0,0(%2)\n" 264 " lghi 1,0x1000\n" 265 " stpt 0x328(1)\n" /* store timer */ 266 " stckc 0x330(1)\n" /* store clock comparator */ 267 " stpx 0x318(1)\n" /* store prefix register */ 268 " stam 0,15,0x340(1)\n"/* store access registers */ 269 " stfpc 0x31c(1)\n" /* store fpu control */ 270 " std 0,0x200(1)\n" /* store f0 */ 271 " std 1,0x208(1)\n" /* store f1 */ 272 " std 2,0x210(1)\n" /* store f2 */ 273 " std 3,0x218(1)\n" /* store f3 */ 274 " std 4,0x220(1)\n" /* store f4 */ 275 " std 5,0x228(1)\n" /* store f5 */ 276 " std 6,0x230(1)\n" /* store f6 */ 277 " std 7,0x238(1)\n" /* store f7 */ 278 " std 8,0x240(1)\n" /* store f8 */ 279 " std 9,0x248(1)\n" /* store f9 */ 280 " std 10,0x250(1)\n" /* store f10 */ 281 " std 11,0x258(1)\n" /* store f11 */ 282 " std 12,0x260(1)\n" /* store f12 */ 283 " std 13,0x268(1)\n" /* store f13 */ 284 " std 14,0x270(1)\n" /* store f14 */ 285 " std 15,0x278(1)\n" /* store f15 */ 286 " stmg 0,15,0x280(1)\n"/* store general registers */ 287 " stctg 0,15,0x380(1)\n"/* store control registers */ 288 " oi 0x384(1),0x10\n"/* fake protection bit */ 289 " lpswe 0(%1)" 290 : "=m" (ctl_buf) 291 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); 292 #endif /* __s390x__ */ 293 while (1); 294 } 295 296 /* 297 * Basic Machine Check/Program Check Handler. 298 */ 299 300 extern void s390_base_mcck_handler(void); 301 extern void s390_base_pgm_handler(void); 302 extern void s390_base_ext_handler(void); 303 304 extern void (*s390_base_mcck_handler_fn)(void); 305 extern void (*s390_base_pgm_handler_fn)(void); 306 extern void (*s390_base_ext_handler_fn)(void); 307 308 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 309 310 #endif 311 312 /* 313 * Helper macro for exception table entries 314 */ 315 #ifndef __s390x__ 316 #define EX_TABLE(_fault,_target) \ 317 ".section __ex_table,\"a\"\n" \ 318 " .align 4\n" \ 319 " .long " #_fault "," #_target "\n" \ 320 ".previous\n" 321 #else 322 #define EX_TABLE(_fault,_target) \ 323 ".section __ex_table,\"a\"\n" \ 324 " .align 8\n" \ 325 " .quad " #_fault "," #_target "\n" \ 326 ".previous\n" 327 #endif 328 329 #endif /* __ASM_S390_PROCESSOR_H */ 330