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 29static inline void get_cpu_id(struct cpuid *ptr) 30{ 31 asm volatile("stidp %0" : "=Q" (*ptr)); 32} 33 34extern void s390_adjust_jiffies(void); 35extern void print_cpu_info(void); 36extern 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 70typedef struct { 71 __u32 ar4; 72} mm_segment_t; 73 74/* 75 * Thread structure 76 */ 77struct 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 /* Used to give failing instruction back to user for ieee exceptions */ 86 unsigned long ieee_instruction_pointer; 87 /* pfault_wait is used to block the process on a pfault event */ 88 unsigned long pfault_wait; 89}; 90 91typedef struct thread_struct thread_struct; 92 93/* 94 * Stack layout of a C stack frame. 95 */ 96#ifndef __PACK_STACK 97struct 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 104struct 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 set_fs(USER_DS); \ 123 regs->psw.mask = psw_user_bits; \ 124 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 125 regs->gprs[15] = new_stackp; \ 126} while (0) 127 128#define start_thread31(regs, new_psw, new_stackp) do { \ 129 set_fs(USER_DS); \ 130 regs->psw.mask = psw_user32_bits; \ 131 regs->psw.addr = new_psw | PSW_ADDR_AMODE; \ 132 regs->gprs[15] = new_stackp; \ 133 crst_table_downgrade(current->mm, 1UL << 31); \ 134} while (0) 135 136/* Forward declaration, a strange C thing */ 137struct task_struct; 138struct mm_struct; 139struct seq_file; 140 141/* Free all resources held by a thread. */ 142extern void release_thread(struct task_struct *); 143extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 144 145/* Prepare to copy thread state - unlazy all lazy status */ 146#define prepare_to_copy(tsk) do { } while (0) 147 148/* 149 * Return saved PC of a blocked thread. 150 */ 151extern unsigned long thread_saved_pc(struct task_struct *t); 152 153/* 154 * Print register of task into buffer. Used in fs/proc/array.c. 155 */ 156extern void task_show_regs(struct seq_file *m, struct task_struct *task); 157 158extern void show_code(struct pt_regs *regs); 159 160unsigned long get_wchan(struct task_struct *p); 161#define task_pt_regs(tsk) ((struct pt_regs *) \ 162 (task_stack_page(tsk) + THREAD_SIZE) - 1) 163#define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 164#define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 165 166/* 167 * Give up the time slice of the virtual PU. 168 */ 169static inline void cpu_relax(void) 170{ 171 if (MACHINE_HAS_DIAG44) 172 asm volatile("diag 0,0,68"); 173 barrier(); 174} 175 176static inline void psw_set_key(unsigned int key) 177{ 178 asm volatile("spka 0(%0)" : : "d" (key)); 179} 180 181/* 182 * Set PSW to specified value. 183 */ 184static inline void __load_psw(psw_t psw) 185{ 186#ifndef __s390x__ 187 asm volatile("lpsw %0" : : "Q" (psw) : "cc"); 188#else 189 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 190#endif 191} 192 193/* 194 * Set PSW mask to specified value, while leaving the 195 * PSW addr pointing to the next instruction. 196 */ 197 198static inline void __load_psw_mask (unsigned long mask) 199{ 200 unsigned long addr; 201 psw_t psw; 202 203 psw.mask = mask; 204 205#ifndef __s390x__ 206 asm volatile( 207 " basr %0,0\n" 208 "0: ahi %0,1f-0b\n" 209 " st %0,%O1+4(%R1)\n" 210 " lpsw %1\n" 211 "1:" 212 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 213#else /* __s390x__ */ 214 asm volatile( 215 " larl %0,1f\n" 216 " stg %0,%O1+8(%R1)\n" 217 " lpswe %1\n" 218 "1:" 219 : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc"); 220#endif /* __s390x__ */ 221} 222 223/* 224 * Function to stop a processor until an interruption occurred 225 */ 226static inline void enabled_wait(void) 227{ 228 __load_psw_mask(PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT | 229 PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY); 230} 231 232/* 233 * Function to drop a processor into disabled wait state 234 */ 235 236static inline void ATTRIB_NORET disabled_wait(unsigned long code) 237{ 238 unsigned long ctl_buf; 239 psw_t dw_psw; 240 241 dw_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; 242 dw_psw.addr = code; 243 /* 244 * Store status and then load disabled wait psw, 245 * the processor is dead afterwards 246 */ 247#ifndef __s390x__ 248 asm volatile( 249 " stctl 0,0,0(%2)\n" 250 " ni 0(%2),0xef\n" /* switch off protection */ 251 " lctl 0,0,0(%2)\n" 252 " stpt 0xd8\n" /* store timer */ 253 " stckc 0xe0\n" /* store clock comparator */ 254 " stpx 0x108\n" /* store prefix register */ 255 " stam 0,15,0x120\n" /* store access registers */ 256 " std 0,0x160\n" /* store f0 */ 257 " std 2,0x168\n" /* store f2 */ 258 " std 4,0x170\n" /* store f4 */ 259 " std 6,0x178\n" /* store f6 */ 260 " stm 0,15,0x180\n" /* store general registers */ 261 " stctl 0,15,0x1c0\n" /* store control registers */ 262 " oi 0x1c0,0x10\n" /* fake protection bit */ 263 " lpsw 0(%1)" 264 : "=m" (ctl_buf) 265 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc"); 266#else /* __s390x__ */ 267 asm volatile( 268 " stctg 0,0,0(%2)\n" 269 " ni 4(%2),0xef\n" /* switch off protection */ 270 " lctlg 0,0,0(%2)\n" 271 " lghi 1,0x1000\n" 272 " stpt 0x328(1)\n" /* store timer */ 273 " stckc 0x330(1)\n" /* store clock comparator */ 274 " stpx 0x318(1)\n" /* store prefix register */ 275 " stam 0,15,0x340(1)\n"/* store access registers */ 276 " stfpc 0x31c(1)\n" /* store fpu control */ 277 " std 0,0x200(1)\n" /* store f0 */ 278 " std 1,0x208(1)\n" /* store f1 */ 279 " std 2,0x210(1)\n" /* store f2 */ 280 " std 3,0x218(1)\n" /* store f3 */ 281 " std 4,0x220(1)\n" /* store f4 */ 282 " std 5,0x228(1)\n" /* store f5 */ 283 " std 6,0x230(1)\n" /* store f6 */ 284 " std 7,0x238(1)\n" /* store f7 */ 285 " std 8,0x240(1)\n" /* store f8 */ 286 " std 9,0x248(1)\n" /* store f9 */ 287 " std 10,0x250(1)\n" /* store f10 */ 288 " std 11,0x258(1)\n" /* store f11 */ 289 " std 12,0x260(1)\n" /* store f12 */ 290 " std 13,0x268(1)\n" /* store f13 */ 291 " std 14,0x270(1)\n" /* store f14 */ 292 " std 15,0x278(1)\n" /* store f15 */ 293 " stmg 0,15,0x280(1)\n"/* store general registers */ 294 " stctg 0,15,0x380(1)\n"/* store control registers */ 295 " oi 0x384(1),0x10\n"/* fake protection bit */ 296 " lpswe 0(%1)" 297 : "=m" (ctl_buf) 298 : "a" (&dw_psw), "a" (&ctl_buf), "m" (dw_psw) : "cc", "0", "1"); 299#endif /* __s390x__ */ 300 while (1); 301} 302 303/* 304 * Basic Machine Check/Program Check Handler. 305 */ 306 307extern void s390_base_mcck_handler(void); 308extern void s390_base_pgm_handler(void); 309extern void s390_base_ext_handler(void); 310 311extern void (*s390_base_mcck_handler_fn)(void); 312extern void (*s390_base_pgm_handler_fn)(void); 313extern void (*s390_base_ext_handler_fn)(void); 314 315#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 316 317#endif 318 319/* 320 * Helper macro for exception table entries 321 */ 322#ifndef __s390x__ 323#define EX_TABLE(_fault,_target) \ 324 ".section __ex_table,\"a\"\n" \ 325 " .align 4\n" \ 326 " .long " #_fault "," #_target "\n" \ 327 ".previous\n" 328#else 329#define EX_TABLE(_fault,_target) \ 330 ".section __ex_table,\"a\"\n" \ 331 " .align 8\n" \ 332 " .quad " #_fault "," #_target "\n" \ 333 ".previous\n" 334#endif 335 336#endif /* __ASM_S390_PROCESSOR_H */ 337