arch/parisc/include/asm/processor.h

   1 /*
   2  * include/asm-parisc/processor.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  * Copyright (C) 2001 Grant Grundler
   6  */
   7
   8 #ifndef __ASM_PARISC_PROCESSOR_H
   9 #define __ASM_PARISC_PROCESSOR_H
  10
  11 #ifndef __ASSEMBLY__
  12 #include <linux/threads.h>
  13
  14 #include <asm/prefetch.h>
  15 #include <asm/hardware.h>
  16 #include <asm/pdc.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/types.h>
  19 #include <asm/percpu.h>
  20
  21 #endif /* __ASSEMBLY__ */
  22
  23 /*
  24  * Default implementation of macro that returns current
  25  * instruction pointer ("program counter").
  26  */
  27 #ifdef CONFIG_PA20
  28 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  29 #else /* mfia added in pa2.0 */
  30 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  31 #endif
  32 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  33
  34 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  35 #define TASK_SIZE               TASK_SIZE_OF(current)
  36 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  37
  38 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  39 #define DEFAULT_MAP_BASE32      (0x40000000UL)
  40
  41 #ifdef CONFIG_64BIT
  42 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  43 #define DEFAULT_MAP_BASE        (0x200000000UL)
  44 #else
  45 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  46 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  47 #endif
  48
  49 #ifdef __KERNEL__
  50
  51 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  52  * prumpf */
  53
  54 #define STACK_TOP       TASK_SIZE
  55 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  56
  57 #endif
  58
  59 #ifndef __ASSEMBLY__
  60
  61 /*
  62  * IRQ STACK - used for irq handler
  63  */
  64 #ifdef __KERNEL__
  65
  66 #include <linux/spinlock_types.h>
  67
  68 #define IRQ_STACK_SIZE      (4096 << 2) /* 16k irq stack size */
  69
  70 union irq_stack_union {
  71         unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
  72         raw_spinlock_t lock;
  73 };
  74
  75 DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);
  76
  77 void call_on_stack(unsigned long p1, void *func, unsigned long new_stack);
  78
  79 #endif /* __KERNEL__ */
  80
  81 /*
  82  * Data detected about CPUs at boot time which is the same for all CPU's.
  83  * HP boxes are SMP - ie identical processors.
  84  *
  85  * FIXME: some CPU rev info may be processor specific...
  86  */
  87 struct system_cpuinfo_parisc {
  88         unsigned int    cpu_count;
  89         unsigned int    cpu_hz;
  90         unsigned int    hversion;
  91         unsigned int    sversion;
  92         enum cpu_type   cpu_type;
  93
  94         struct {
  95                 struct pdc_model model;
  96                 unsigned long versions;
  97                 unsigned long cpuid;
  98                 unsigned long capabilities;
  99                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
 100         } pdc;
 101
 102         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
 103         const char      *family_name;   /* e.g. "1.1e" */
 104 };
 105
 106
 107 /* Per CPU data structure - ie varies per CPU.  */
 108 struct cpuinfo_parisc {
 109         unsigned long it_value;     /* Interval Timer at last timer Intr */
 110         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
 111         unsigned long irq_count;    /* number of IRQ's since boot */
 112         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
 113         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
 114         unsigned long hpa;          /* Host Physical address */
 115         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 116 #ifdef CONFIG_SMP
 117         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 118 #endif
 119         unsigned long bh_count;     /* number of times bh was invoked */
 120         unsigned long prof_counter; /* per CPU profiling support */
 121         unsigned long prof_multiplier;  /* per CPU profiling support */
 122         unsigned long fp_rev;
 123         unsigned long fp_model;
 124         unsigned int state;
 125         struct parisc_device *dev;
 126         unsigned long loops_per_jiffy;
 127 };
 128
 129 extern struct system_cpuinfo_parisc boot_cpu_data;
 130 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 131
 132 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 133
 134 typedef struct {
 135         int seg;
 136 } mm_segment_t;
 137
 138 #define ARCH_MIN_TASKALIGN      8
 139
 140 struct thread_struct {
 141         struct pt_regs regs;
 142         unsigned long  task_size;
 143         unsigned long  map_base;
 144         unsigned long  flags;
 145 };
 146
 147 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 148
 149 /* Thread struct flags. */
 150 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 151 #define PARISC_UAC_SIGBUS       (1UL << 1)
 152 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 153
 154 #define PARISC_UAC_SHIFT        0
 155 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 156
 157 #define SET_UNALIGN_CTL(task,value)                                       \
 158         ({                                                                \
 159         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 160                                 | (((value) << PARISC_UAC_SHIFT) &        \
 161                                    PARISC_UAC_MASK));                     \
 162         0;                                                                \
 163         })
 164
 165 #define GET_UNALIGN_CTL(task,addr)                                        \
 166         ({                                                                \
 167         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 168                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 169         })
 170
 171 #define INIT_THREAD { \
 172         .regs = {       .gr     = { 0, }, \
 173                         .fr     = { 0, }, \
 174                         .sr     = { 0, }, \
 175                         .iasq   = { 0, }, \
 176                         .iaoq   = { 0, }, \
 177                         .cr27   = 0, \
 178                 }, \
 179         .task_size      = DEFAULT_TASK_SIZE, \
 180         .map_base       = DEFAULT_MAP_BASE, \
 181         .flags          = 0 \
 182         }
 183
 184 /*
 185  * Return saved PC of a blocked thread.  This is used by ps mostly.
 186  */
 187
 188 struct task_struct;
 189 unsigned long thread_saved_pc(struct task_struct *t);
 190 void show_trace(struct task_struct *task, unsigned long *stack);
 191
 192 /*
 193  * Start user thread in another space.
 194  *
 195  * Note that we set both the iaoq and r31 to the new pc. When
 196  * the kernel initially calls execve it will return through an
 197  * rfi path that will use the values in the iaoq. The execve
 198  * syscall path will return through the gateway page, and
 199  * that uses r31 to branch to.
 200  *
 201  * For ELF we clear r23, because the dynamic linker uses it to pass
 202  * the address of the finalizer function.
 203  *
 204  * We also initialize sr3 to an illegal value (illegal for our
 205  * implementation, not for the architecture).
 206  */
 207 typedef unsigned int elf_caddr_t;
 208
 209 #define start_thread_som(regs, new_pc, new_sp) do {     \
 210         unsigned long *sp = (unsigned long *)new_sp;    \
 211         __u32 spaceid = (__u32)current->mm->context;    \
 212         unsigned long pc = (unsigned long)new_pc;       \
 213         /* offset pc for priv. level */                 \
 214         pc |= 3;                                        \
 215                                                         \
 216         regs->iasq[0] = spaceid;                        \
 217         regs->iasq[1] = spaceid;                        \
 218         regs->iaoq[0] = pc;                             \
 219         regs->iaoq[1] = pc + 4;                         \
 220         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 221         regs->sr[3] = 0xffff;                           \
 222         regs->sr[4] = spaceid;                          \
 223         regs->sr[5] = spaceid;                          \
 224         regs->sr[6] = spaceid;                          \
 225         regs->sr[7] = spaceid;                          \
 226         regs->gr[ 0] = USER_PSW;                        \
 227         regs->gr[30] = ((new_sp)+63)&~63;               \
 228         regs->gr[31] = pc;                              \
 229                                                         \
 230         get_user(regs->gr[26],&sp[0]);                  \
 231         get_user(regs->gr[25],&sp[-1]);                 \
 232         get_user(regs->gr[24],&sp[-2]);                 \
 233         get_user(regs->gr[23],&sp[-3]);                 \
 234 } while(0)
 235
 236 /* The ELF abi wants things done a "wee bit" differently than
 237  * som does.  Supporting this behavior here avoids
 238  * having our own version of create_elf_tables.
 239  *
 240  * Oh, and yes, that is not a typo, we are really passing argc in r25
 241  * and argv in r24 (rather than r26 and r25).  This is because that's
 242  * where __libc_start_main wants them.
 243  *
 244  * Duplicated from dl-machine.h for the benefit of readers:
 245  *
 246  *  Our initial stack layout is rather different from everyone else's
 247  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 248  *  this:
 249
 250    -----------------------------------  (user startup code creates this frame)
 251    |         32 bytes of magic       |
 252    |---------------------------------|
 253    | 32 bytes argument/sp save area  |
 254    |---------------------------------| (bprm->p)
 255    |        ELF auxiliary info       |
 256    |         (up to 28 words)        |
 257    |---------------------------------|
 258    |               NULL              |
 259    |---------------------------------|
 260    |       Environment pointers      |
 261    |---------------------------------|
 262    |               NULL              |
 263    |---------------------------------|
 264    |        Argument pointers        |
 265    |---------------------------------| <- argv
 266    |          argc (1 word)          |
 267    |---------------------------------| <- bprm->exec (HACK!)
 268    |         N bytes of slack        |
 269    |---------------------------------|
 270    |    filename passed to execve    |
 271    |---------------------------------| (mm->env_end)
 272    |           env strings           |
 273    |---------------------------------| (mm->env_start, mm->arg_end)
 274    |           arg strings           |
 275    |---------------------------------|
 276    | additional faked arg strings if |
 277    | we're invoked via binfmt_script |
 278    |---------------------------------| (mm->arg_start)
 279    stack base is at TASK_SIZE - rlim_max.
 280
 281 on downward growing arches, it looks like this:
 282    stack base at TASK_SIZE
 283    | filename passed to execve
 284    | env strings
 285    | arg strings
 286    | faked arg strings
 287    | slack
 288    | ELF
 289    | envps
 290    | argvs
 291    | argc
 292
 293  *  The pleasant part of this is that if we need to skip arguments we
 294  *  can just decrement argc and move argv, because the stack pointer
 295  *  is utterly unrelated to the location of the environment and
 296  *  argument vectors.
 297  *
 298  * Note that the S/390 people took the easy way out and hacked their
 299  * GCC to make the stack grow downwards.
 300  *
 301  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 302  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 303  * it in here from the current->personality
 304  */
 305
 306 #ifdef CONFIG_64BIT
 307 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 308 #else
 309 #define USER_WIDE_MODE  0
 310 #endif
 311
 312 #define start_thread(regs, new_pc, new_sp) do {         \
 313         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 314         __u32 spaceid = (__u32)current->mm->context;    \
 315         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 316         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 317                                                         \
 318         regs->iasq[0] = spaceid;                        \
 319         regs->iasq[1] = spaceid;                        \
 320         regs->iaoq[0] = pc;                             \
 321         regs->iaoq[1] = pc + 4;                         \
 322         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 323         regs->sr[3] = 0xffff;                           \
 324         regs->sr[4] = spaceid;                          \
 325         regs->sr[5] = spaceid;                          \
 326         regs->sr[6] = spaceid;                          \
 327         regs->sr[7] = spaceid;                          \
 328         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 329         regs->fr[ 0] = 0LL;                             \
 330         regs->fr[ 1] = 0LL;                             \
 331         regs->fr[ 2] = 0LL;                             \
 332         regs->fr[ 3] = 0LL;                             \
 333         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 334         regs->gr[31] = pc;                              \
 335                                                         \
 336         get_user(regs->gr[25], (argv - 1));             \
 337         regs->gr[24] = (long) argv;                     \
 338         regs->gr[23] = 0;                               \
 339 } while(0)
 340
 341 struct task_struct;
 342 struct mm_struct;
 343
 344 /* Free all resources held by a thread. */
 345 extern void release_thread(struct task_struct *);
 346
 347 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 348
 349 extern unsigned long get_wchan(struct task_struct *p);
 350
 351 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 352 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 353
 354 #define cpu_relax()     barrier()
 355
 356 /* Used as a macro to identify the combined VIPT/PIPT cached
 357  * CPUs which require a guarantee of coherency (no inequivalent
 358  * aliases with different data, whether clean or not) to operate */
 359 static inline int parisc_requires_coherency(void)
 360 {
 361 #ifdef CONFIG_PA8X00
 362         return (boot_cpu_data.cpu_type == mako) ||
 363                 (boot_cpu_data.cpu_type == mako2);
 364 #else
 365         return 0;
 366 #endif
 367 }
 368
 369 #endif /* __ASSEMBLY__ */
 370
 371 #endif /* __ASM_PARISC_PROCESSOR_H */