include/asm-parisc/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 #include <linux/spinlock_types.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/page.h>
  17 #include <asm/pdc.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/types.h>
  20 #include <asm/system.h>
  21 #endif /* __ASSEMBLY__ */
  22
  23 #define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  24
  25 /*
  26  * Default implementation of macro that returns current
  27  * instruction pointer ("program counter").
  28  */
  29 #ifdef CONFIG_PA20
  30 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  31 #else /* mfia added in pa2.0 */
  32 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  33 #endif
  34 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  35
  36 #define TASK_SIZE               (current->thread.task_size)
  37 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  38
  39 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  40 #define DEFAULT_MAP_BASE32      (0x40000000UL)
  41
  42 #ifdef __LP64__
  43 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  44 #define DEFAULT_MAP_BASE        (0x200000000UL)
  45 #else
  46 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  47 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  48 #endif
  49
  50 #ifndef __ASSEMBLY__
  51
  52 /*
  53  * Data detected about CPUs at boot time which is the same for all CPU's.
  54  * HP boxes are SMP - ie identical processors.
  55  *
  56  * FIXME: some CPU rev info may be processor specific...
  57  */
  58 struct system_cpuinfo_parisc {
  59         unsigned int    cpu_count;
  60         unsigned int    cpu_hz;
  61         unsigned int    hversion;
  62         unsigned int    sversion;
  63         enum cpu_type   cpu_type;
  64
  65         struct {
  66                 struct pdc_model model;
  67                 unsigned long versions;
  68                 unsigned long cpuid;
  69                 unsigned long capabilities;
  70                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  71         } pdc;
  72
  73         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  74         char            *family_name;   /* e.g. "1.1e" */
  75 };
  76
  77
  78 /* Per CPU data structure - ie varies per CPU.  */
  79 struct cpuinfo_parisc {
  80         unsigned long it_value;     /* Interval Timer at last timer Intr */
  81         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  82         unsigned long irq_count;    /* number of IRQ's since boot */
  83         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  84         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  85         unsigned long hpa;          /* Host Physical address */
  86         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  87 #ifdef CONFIG_SMP
  88         spinlock_t lock;            /* synchronization for ipi's */
  89         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  90         unsigned long ipi_count;    /* number ipi Interrupts */
  91 #endif
  92         unsigned long bh_count;     /* number of times bh was invoked */
  93         unsigned long prof_counter; /* per CPU profiling support */
  94         unsigned long prof_multiplier;  /* per CPU profiling support */
  95         unsigned long fp_rev;
  96         unsigned long fp_model;
  97         unsigned int state;
  98         struct parisc_device *dev;
  99         unsigned long loops_per_jiffy;
 100 };
 101
 102 extern struct system_cpuinfo_parisc boot_cpu_data;
 103 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 104 #define current_cpu_data cpu_data[smp_processor_id()]
 105
 106 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 107
 108 typedef struct {
 109         int seg;
 110 } mm_segment_t;
 111
 112 #define ARCH_MIN_TASKALIGN      8
 113
 114 struct thread_struct {
 115         struct pt_regs regs;
 116         unsigned long  task_size;
 117         unsigned long  map_base;
 118         unsigned long  flags;
 119 };
 120
 121 /* Thread struct flags. */
 122 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 123 #define PARISC_UAC_SIGBUS       (1UL << 1)
 124 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 125
 126 #define PARISC_UAC_SHIFT        0
 127 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 128
 129 #define SET_UNALIGN_CTL(task,value)                                       \
 130         ({                                                                \
 131         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 132                                 | (((value) << PARISC_UAC_SHIFT) &        \
 133                                    PARISC_UAC_MASK));                     \
 134         0;                                                                \
 135         })
 136
 137 #define GET_UNALIGN_CTL(task,addr)                                        \
 138         ({                                                                \
 139         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 140                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 141         })
 142
 143 #define INIT_THREAD { \
 144         .regs = {       .gr     = { 0, }, \
 145                         .fr     = { 0, }, \
 146                         .sr     = { 0, }, \
 147                         .iasq   = { 0, }, \
 148                         .iaoq   = { 0, }, \
 149                         .cr27   = 0, \
 150                 }, \
 151         .task_size      = DEFAULT_TASK_SIZE, \
 152         .map_base       = DEFAULT_MAP_BASE, \
 153         .flags          = 0 \
 154         }
 155
 156 /*
 157  * Return saved PC of a blocked thread.  This is used by ps mostly.
 158  */
 159
 160 unsigned long thread_saved_pc(struct task_struct *t);
 161 void show_trace(struct task_struct *task, unsigned long *stack);
 162
 163 /*
 164  * Start user thread in another space.
 165  *
 166  * Note that we set both the iaoq and r31 to the new pc. When
 167  * the kernel initially calls execve it will return through an
 168  * rfi path that will use the values in the iaoq. The execve
 169  * syscall path will return through the gateway page, and
 170  * that uses r31 to branch to.
 171  *
 172  * For ELF we clear r23, because the dynamic linker uses it to pass
 173  * the address of the finalizer function.
 174  *
 175  * We also initialize sr3 to an illegal value (illegal for our
 176  * implementation, not for the architecture).
 177  */
 178 typedef unsigned int elf_caddr_t;
 179
 180 #define start_thread_som(regs, new_pc, new_sp) do {     \
 181         unsigned long *sp = (unsigned long *)new_sp;    \
 182         __u32 spaceid = (__u32)current->mm->context;    \
 183         unsigned long pc = (unsigned long)new_pc;       \
 184         /* offset pc for priv. level */                 \
 185         pc |= 3;                                        \
 186                                                         \
 187         set_fs(USER_DS);                                \
 188         regs->iasq[0] = spaceid;                        \
 189         regs->iasq[1] = spaceid;                        \
 190         regs->iaoq[0] = pc;                             \
 191         regs->iaoq[1] = pc + 4;                         \
 192         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 193         regs->sr[3] = 0xffff;                           \
 194         regs->sr[4] = spaceid;                          \
 195         regs->sr[5] = spaceid;                          \
 196         regs->sr[6] = spaceid;                          \
 197         regs->sr[7] = spaceid;                          \
 198         regs->gr[ 0] = USER_PSW;                        \
 199         regs->gr[30] = ((new_sp)+63)&~63;               \
 200         regs->gr[31] = pc;                              \
 201                                                         \
 202         get_user(regs->gr[26],&sp[0]);                  \
 203         get_user(regs->gr[25],&sp[-1]);                 \
 204         get_user(regs->gr[24],&sp[-2]);                 \
 205         get_user(regs->gr[23],&sp[-3]);                 \
 206 } while(0)
 207
 208 /* The ELF abi wants things done a "wee bit" differently than
 209  * som does.  Supporting this behavior here avoids
 210  * having our own version of create_elf_tables.
 211  *
 212  * Oh, and yes, that is not a typo, we are really passing argc in r25
 213  * and argv in r24 (rather than r26 and r25).  This is because that's
 214  * where __libc_start_main wants them.
 215  *
 216  * Duplicated from dl-machine.h for the benefit of readers:
 217  *
 218  *  Our initial stack layout is rather different from everyone else's
 219  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 220  *  this:
 221
 222    -----------------------------------  (user startup code creates this frame)
 223    |         32 bytes of magic       |
 224    |---------------------------------|
 225    | 32 bytes argument/sp save area  |
 226    |---------------------------------| (bprm->p)
 227    |        ELF auxiliary info       |
 228    |         (up to 28 words)        |
 229    |---------------------------------|
 230    |               NULL              |
 231    |---------------------------------|
 232    |       Environment pointers      |
 233    |---------------------------------|
 234    |               NULL              |
 235    |---------------------------------|
 236    |        Argument pointers        |
 237    |---------------------------------| <- argv
 238    |          argc (1 word)          |
 239    |---------------------------------| <- bprm->exec (HACK!)
 240    |         N bytes of slack        |
 241    |---------------------------------|
 242    |    filename passed to execve    |
 243    |---------------------------------| (mm->env_end)
 244    |           env strings           |
 245    |---------------------------------| (mm->env_start, mm->arg_end)
 246    |           arg strings           |
 247    |---------------------------------|
 248    | additional faked arg strings if |
 249    | we're invoked via binfmt_script |
 250    |---------------------------------| (mm->arg_start)
 251    stack base is at TASK_SIZE - rlim_max.
 252
 253 on downward growing arches, it looks like this:
 254    stack base at TASK_SIZE
 255    | filename passed to execve
 256    | env strings
 257    | arg strings
 258    | faked arg strings
 259    | slack
 260    | ELF
 261    | envps
 262    | argvs
 263    | argc
 264
 265  *  The pleasant part of this is that if we need to skip arguments we
 266  *  can just decrement argc and move argv, because the stack pointer
 267  *  is utterly unrelated to the location of the environment and
 268  *  argument vectors.
 269  *
 270  * Note that the S/390 people took the easy way out and hacked their
 271  * GCC to make the stack grow downwards.
 272  *
 273  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 274  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 275  * it in here from the current->personality
 276  */
 277
 278 #ifdef __LP64__
 279 #define USER_WIDE_MODE  (personality(current->personality) == PER_LINUX)
 280 #else
 281 #define USER_WIDE_MODE  0
 282 #endif
 283
 284 #define start_thread(regs, new_pc, new_sp) do {         \
 285         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 286         __u32 spaceid = (__u32)current->mm->context;    \
 287         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 288         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 289                                                         \
 290         set_fs(USER_DS);                                \
 291         regs->iasq[0] = spaceid;                        \
 292         regs->iasq[1] = spaceid;                        \
 293         regs->iaoq[0] = pc;                             \
 294         regs->iaoq[1] = pc + 4;                         \
 295         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 296         regs->sr[3] = 0xffff;                           \
 297         regs->sr[4] = spaceid;                          \
 298         regs->sr[5] = spaceid;                          \
 299         regs->sr[6] = spaceid;                          \
 300         regs->sr[7] = spaceid;                          \
 301         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 302         regs->fr[ 0] = 0LL;                             \
 303         regs->fr[ 1] = 0LL;                             \
 304         regs->fr[ 2] = 0LL;                             \
 305         regs->fr[ 3] = 0LL;                             \
 306         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 307         regs->gr[31] = pc;                              \
 308                                                         \
 309         get_user(regs->gr[25], (argv - 1));             \
 310         regs->gr[24] = (long) argv;                     \
 311         regs->gr[23] = 0;                               \
 312 } while(0)
 313
 314 struct task_struct;
 315 struct mm_struct;
 316
 317 /* Free all resources held by a thread. */
 318 extern void release_thread(struct task_struct *);
 319 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 320
 321 /* Prepare to copy thread state - unlazy all lazy status */
 322 #define prepare_to_copy(tsk)    do { } while (0)
 323
 324 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 325
 326 extern unsigned long get_wchan(struct task_struct *p);
 327
 328 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 329 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 330
 331
 332 /*
 333  * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
 334  * In addition, many implementations do hardware prefetching of both
 335  * instructions and data.
 336  *
 337  * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
 338  * to gr0 but not in a way that Linux can use.  If the load would cause an
 339  * interruption (eg due to prefetching 0), it is suppressed on PA2.0
 340  * processors, but not on 7300LC.
 341  */
 342 #ifdef  CONFIG_PREFETCH
 343 #define ARCH_HAS_PREFETCH
 344 #define ARCH_HAS_PREFETCHW
 345
 346 extern inline void prefetch(const void *addr)
 347 {
 348         __asm__("ldw 0(%0), %%r0" : : "r" (addr));
 349 }
 350
 351 extern inline void prefetchw(const void *addr)
 352 {
 353         __asm__("ldd 0(%0), %%r0" : : "r" (addr));
 354 }
 355 #endif
 356
 357 #define cpu_relax()     barrier()
 358
 359 #endif /* __ASSEMBLY__ */
 360
 361 #endif /* __ASM_PARISC_PROCESSOR_H */