arch/s390/include/asm/processor.h

   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(%1)" : "=m" (*ptr) : "a" (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         /* 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
  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         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 */
 137 struct task_struct;
 138 struct mm_struct;
 139 struct seq_file;
 140
 141 /* Free all resources held by a thread. */
 142 extern void release_thread(struct task_struct *);
 143 extern 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  */
 151 extern 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  */
 156 extern void task_show_regs(struct seq_file *m, struct task_struct *task);
 157
 158 extern void show_code(struct pt_regs *regs);
 159
 160 unsigned 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  */
 169 static inline void cpu_relax(void)
 170 {
 171         if (MACHINE_HAS_DIAG44)
 172                 asm volatile("diag 0,0,68");
 173         barrier();
 174 }
 175
 176 static 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  */
 184 static inline void __load_psw(psw_t psw)
 185 {
 186 #ifndef __s390x__
 187         asm volatile("lpsw  0(%0)" : : "a" (&psw), "m" (psw) : "cc");
 188 #else
 189         asm volatile("lpswe 0(%0)" : : "a" (&psw), "m" (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
 198 static 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      %0,4(%1)\n"
 210                 "       lpsw    0(%1)\n"
 211                 "1:"
 212                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 213 #else /* __s390x__ */
 214         asm volatile(
 215                 "       larl    %0,1f\n"
 216                 "       stg     %0,8(%1)\n"
 217                 "       lpswe   0(%1)\n"
 218                 "1:"
 219                 : "=&d" (addr) : "a" (&psw), "m" (psw) : "memory", "cc");
 220 #endif /* __s390x__ */
 221 }
 222
 223 /*
 224  * Function to stop a processor until an interruption occurred
 225  */
 226 static 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
 236 static 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
 307 extern void s390_base_mcck_handler(void);
 308 extern void s390_base_pgm_handler(void);
 309 extern void s390_base_ext_handler(void);
 310
 311 extern void (*s390_base_mcck_handler_fn)(void);
 312 extern void (*s390_base_pgm_handler_fn)(void);
 313 extern 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           */