release/src-rt-6.x.4708/linux/linux-2.6.36/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/system.h>
  20 #include <asm/percpu.h>
  21
  22 #endif /* __ASSEMBLY__ */
  23
  24 #define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  25
  26 /*
  27  * Default implementation of macro that returns current
  28  * instruction pointer ("program counter").
  29  */
  30 #ifdef CONFIG_PA20
  31 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  32 #else /* mfia added in pa2.0 */
  33 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  34 #endif
  35 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  36
  37 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  38 #define TASK_SIZE               TASK_SIZE_OF(current)
  39 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  40
  41 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  42 #define DEFAULT_MAP_BASE32      (0x40000000UL)
  43
  44 #ifdef CONFIG_64BIT
  45 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  46 #define DEFAULT_MAP_BASE        (0x200000000UL)
  47 #else
  48 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  49 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  50 #endif
  51
  52 #ifdef __KERNEL__
  53
  54
  55 #define STACK_TOP       TASK_SIZE
  56 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  57
  58 #endif
  59
  60 #ifndef __ASSEMBLY__
  61
  62 struct system_cpuinfo_parisc {
  63         unsigned int    cpu_count;
  64         unsigned int    cpu_hz;
  65         unsigned int    hversion;
  66         unsigned int    sversion;
  67         enum cpu_type   cpu_type;
  68
  69         struct {
  70                 struct pdc_model model;
  71                 unsigned long versions;
  72                 unsigned long cpuid;
  73                 unsigned long capabilities;
  74                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  75         } pdc;
  76
  77         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  78         const char      *family_name;   /* e.g. "1.1e" */
  79 };
  80
  81
  82 /* Per CPU data structure - ie varies per CPU.  */
  83 struct cpuinfo_parisc {
  84         unsigned long it_value;     /* Interval Timer at last timer Intr */
  85         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  86         unsigned long irq_count;    /* number of IRQ's since boot */
  87         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  88         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  89         unsigned long hpa;          /* Host Physical address */
  90         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  91 #ifdef CONFIG_SMP
  92         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  93         unsigned long ipi_count;    /* number ipi Interrupts */
  94 #endif
  95         unsigned long bh_count;     /* number of times bh was invoked */
  96         unsigned long prof_counter; /* per CPU profiling support */
  97         unsigned long prof_multiplier;  /* per CPU profiling support */
  98         unsigned long fp_rev;
  99         unsigned long fp_model;
 100         unsigned int state;
 101         struct parisc_device *dev;
 102         unsigned long loops_per_jiffy;
 103 };
 104
 105 extern struct system_cpuinfo_parisc boot_cpu_data;
 106 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 107
 108 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 109
 110 typedef struct {
 111         int seg;
 112 } mm_segment_t;
 113
 114 #define ARCH_MIN_TASKALIGN      8
 115
 116 struct thread_struct {
 117         struct pt_regs regs;
 118         unsigned long  task_size;
 119         unsigned long  map_base;
 120         unsigned long  flags;
 121 };
 122
 123 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 124
 125 /* Thread struct flags. */
 126 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 127 #define PARISC_UAC_SIGBUS       (1UL << 1)
 128 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 129
 130 #define PARISC_UAC_SHIFT        0
 131 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 132
 133 #define SET_UNALIGN_CTL(task,value)                                       \
 134         ({                                                                \
 135         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 136                                 | (((value) << PARISC_UAC_SHIFT) &        \
 137                                    PARISC_UAC_MASK));                     \
 138         0;                                                                \
 139         })
 140
 141 #define GET_UNALIGN_CTL(task,addr)                                        \
 142         ({                                                                \
 143         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 144                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 145         })
 146
 147 #define INIT_THREAD { \
 148         .regs = {       .gr     = { 0, }, \
 149                         .fr     = { 0, }, \
 150                         .sr     = { 0, }, \
 151                         .iasq   = { 0, }, \
 152                         .iaoq   = { 0, }, \
 153                         .cr27   = 0, \
 154                 }, \
 155         .task_size      = DEFAULT_TASK_SIZE, \
 156         .map_base       = DEFAULT_MAP_BASE, \
 157         .flags          = 0 \
 158         }
 159
 160 /*
 161  * Return saved PC of a blocked thread.  This is used by ps mostly.
 162  */
 163
 164 unsigned long thread_saved_pc(struct task_struct *t);
 165 void show_trace(struct task_struct *task, unsigned long *stack);
 166
 167 /*
 168  * Start user thread in another space.
 169  *
 170  * Note that we set both the iaoq and r31 to the new pc. When
 171  * the kernel initially calls execve it will return through an
 172  * rfi path that will use the values in the iaoq. The execve
 173  * syscall path will return through the gateway page, and
 174  * that uses r31 to branch to.
 175  *
 176  * For ELF we clear r23, because the dynamic linker uses it to pass
 177  * the address of the finalizer function.
 178  *
 179  * We also initialize sr3 to an illegal value (illegal for our
 180  * implementation, not for the architecture).
 181  */
 182 typedef unsigned int elf_caddr_t;
 183
 184 #define start_thread_som(regs, new_pc, new_sp) do {     \
 185         unsigned long *sp = (unsigned long *)new_sp;    \
 186         __u32 spaceid = (__u32)current->mm->context;    \
 187         unsigned long pc = (unsigned long)new_pc;       \
 188         /* offset pc for priv. level */                 \
 189         pc |= 3;                                        \
 190                                                         \
 191         set_fs(USER_DS);                                \
 192         regs->iasq[0] = spaceid;                        \
 193         regs->iasq[1] = spaceid;                        \
 194         regs->iaoq[0] = pc;                             \
 195         regs->iaoq[1] = pc + 4;                         \
 196         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 197         regs->sr[3] = 0xffff;                           \
 198         regs->sr[4] = spaceid;                          \
 199         regs->sr[5] = spaceid;                          \
 200         regs->sr[6] = spaceid;                          \
 201         regs->sr[7] = spaceid;                          \
 202         regs->gr[ 0] = USER_PSW;                        \
 203         regs->gr[30] = ((new_sp)+63)&~63;               \
 204         regs->gr[31] = pc;                              \
 205                                                         \
 206         get_user(regs->gr[26],&sp[0]);                  \
 207         get_user(regs->gr[25],&sp[-1]);                 \
 208         get_user(regs->gr[24],&sp[-2]);                 \
 209         get_user(regs->gr[23],&sp[-3]);                 \
 210 } while(0)
 211
 212 /* The ELF abi wants things done a "wee bit" differently than
 213  * som does.  Supporting this behavior here avoids
 214  * having our own version of create_elf_tables.
 215  *
 216  * Oh, and yes, that is not a typo, we are really passing argc in r25
 217  * and argv in r24 (rather than r26 and r25).  This is because that's
 218  * where __libc_start_main wants them.
 219  *
 220  * Duplicated from dl-machine.h for the benefit of readers:
 221  *
 222  *  Our initial stack layout is rather different from everyone else's
 223  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 224  *  this:
 225
 226    -----------------------------------  (user startup code creates this frame)
 227    |         32 bytes of magic       |
 228    |---------------------------------|
 229    | 32 bytes argument/sp save area  |
 230    |---------------------------------| (bprm->p)
 231    |        ELF auxiliary info       |
 232    |         (up to 28 words)        |
 233    |---------------------------------|
 234    |               NULL              |
 235    |---------------------------------|
 236    |       Environment pointers      |
 237    |---------------------------------|
 238    |               NULL              |
 239    |---------------------------------|
 240    |        Argument pointers        |
 241    |---------------------------------| <- argv
 242    |          argc (1 word)          |
 243    |---------------------------------| <- bprm->exec (HACK!)
 244    |         N bytes of slack        |
 245    |---------------------------------|
 246    |    filename passed to execve    |
 247    |---------------------------------| (mm->env_end)
 248    |           env strings           |
 249    |---------------------------------| (mm->env_start, mm->arg_end)
 250    |           arg strings           |
 251    |---------------------------------|
 252    | additional faked arg strings if |
 253    | we're invoked via binfmt_script |
 254    |---------------------------------| (mm->arg_start)
 255    stack base is at TASK_SIZE - rlim_max.
 256
 257 on downward growing arches, it looks like this:
 258    stack base at TASK_SIZE
 259    | filename passed to execve
 260    | env strings
 261    | arg strings
 262    | faked arg strings
 263    | slack
 264    | ELF
 265    | envps
 266    | argvs
 267    | argc
 268
 269  *  The pleasant part of this is that if we need to skip arguments we
 270  *  can just decrement argc and move argv, because the stack pointer
 271  *  is utterly unrelated to the location of the environment and
 272  *  argument vectors.
 273  *
 274  * Note that the S/390 people took the easy way out and hacked their
 275  * GCC to make the stack grow downwards.
 276  *
 277  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 278  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 279  * it in here from the current->personality
 280  */
 281
 282 #ifdef CONFIG_64BIT
 283 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 284 #else
 285 #define USER_WIDE_MODE  0
 286 #endif
 287
 288 #define start_thread(regs, new_pc, new_sp) do {         \
 289         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 290         __u32 spaceid = (__u32)current->mm->context;    \
 291         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 292         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 293                                                         \
 294         set_fs(USER_DS);                                \
 295         regs->iasq[0] = spaceid;                        \
 296         regs->iasq[1] = spaceid;                        \
 297         regs->iaoq[0] = pc;                             \
 298         regs->iaoq[1] = pc + 4;                         \
 299         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 300         regs->sr[3] = 0xffff;                           \
 301         regs->sr[4] = spaceid;                          \
 302         regs->sr[5] = spaceid;                          \
 303         regs->sr[6] = spaceid;                          \
 304         regs->sr[7] = spaceid;                          \
 305         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 306         regs->fr[ 0] = 0LL;                             \
 307         regs->fr[ 1] = 0LL;                             \
 308         regs->fr[ 2] = 0LL;                             \
 309         regs->fr[ 3] = 0LL;                             \
 310         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 311         regs->gr[31] = pc;                              \
 312                                                         \
 313         get_user(regs->gr[25], (argv - 1));             \
 314         regs->gr[24] = (long) argv;                     \
 315         regs->gr[23] = 0;                               \
 316 } while(0)
 317
 318 struct task_struct;
 319 struct mm_struct;
 320
 321 /* Free all resources held by a thread. */
 322 extern void release_thread(struct task_struct *);
 323 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 324
 325 /* Prepare to copy thread state - unlazy all lazy status */
 326 #define prepare_to_copy(tsk)    do { } while (0)
 327
 328 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 329
 330 extern unsigned long get_wchan(struct task_struct *p);
 331
 332 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 333 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 334
 335 #define cpu_relax()     barrier()
 336
 337 /* Used as a macro to identify the combined VIPT/PIPT cached
 338  * CPUs which require a guarantee of coherency (no inequivalent
 339  * aliases with different data, whether clean or not) to operate */
 340 static inline int parisc_requires_coherency(void)
 341 {
 342 #ifdef CONFIG_PA8X00
 343         return (boot_cpu_data.cpu_type == mako) ||
 344                 (boot_cpu_data.cpu_type == mako2);
 345 #else
 346         return 0;
 347 #endif
 348 }
 349
 350 #endif /* __ASSEMBLY__ */
 351
 352 #endif /* __ASM_PARISC_PROCESSOR_H */