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