kernel/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 HAVE_ARCH_PICK_MMAP_LAYOUT
  34
  35 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  36 #define TASK_SIZE               TASK_SIZE_OF(current)
  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 CONFIG_64BIT
  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 #ifdef __KERNEL__
  51
  52 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  53  * prumpf */
  54
  55 #define STACK_TOP       TASK_SIZE
  56 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  57
  58 /* Allow bigger stacks for 64-bit processes */
  59 #define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
  60                          ? (1 << 30)    /* 1 GB */                      \
  61                          : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
  62
  63 #endif
  64
  65 #ifndef __ASSEMBLY__
  66
  67 /*
  68  * Data detected about CPUs at boot time which is the same for all CPU's.
  69  * HP boxes are SMP - ie identical processors.
  70  *
  71  * FIXME: some CPU rev info may be processor specific...
  72  */
  73 struct system_cpuinfo_parisc {
  74         unsigned int    cpu_count;
  75         unsigned int    cpu_hz;
  76         unsigned int    hversion;
  77         unsigned int    sversion;
  78         enum cpu_type   cpu_type;
  79
  80         struct {
  81                 struct pdc_model model;
  82                 unsigned long versions;
  83                 unsigned long cpuid;
  84                 unsigned long capabilities;
  85                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  86         } pdc;
  87
  88         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  89         const char      *family_name;   /* e.g. "1.1e" */
  90 };
  91
  92
  93 /* Per CPU data structure - ie varies per CPU.  */
  94 struct cpuinfo_parisc {
  95         unsigned long it_value;     /* Interval Timer at last timer Intr */
  96         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  97         unsigned long irq_count;    /* number of IRQ's since boot */
  98         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  99         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
 100         unsigned long hpa;          /* Host Physical address */
 101         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 102 #ifdef CONFIG_SMP
 103         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 104 #endif
 105         unsigned long bh_count;     /* number of times bh was invoked */
 106         unsigned long prof_counter; /* per CPU profiling support */
 107         unsigned long prof_multiplier;  /* per CPU profiling support */
 108         unsigned long fp_rev;
 109         unsigned long fp_model;
 110         unsigned int state;
 111         struct parisc_device *dev;
 112         unsigned long loops_per_jiffy;
 113 };
 114
 115 extern struct system_cpuinfo_parisc boot_cpu_data;
 116 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 117
 118 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 119
 120 typedef struct {
 121         int seg;
 122 } mm_segment_t;
 123
 124 #define ARCH_MIN_TASKALIGN      8
 125
 126 struct thread_struct {
 127         struct pt_regs regs;
 128         unsigned long  task_size;
 129         unsigned long  map_base;
 130         unsigned long  flags;
 131 };
 132
 133 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 134
 135 /* Thread struct flags. */
 136 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 137 #define PARISC_UAC_SIGBUS       (1UL << 1)
 138 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 139
 140 #define PARISC_UAC_SHIFT        0
 141 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 142
 143 #define SET_UNALIGN_CTL(task,value)                                       \
 144         ({                                                                \
 145         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 146                                 | (((value) << PARISC_UAC_SHIFT) &        \
 147                                    PARISC_UAC_MASK));                     \
 148         0;                                                                \
 149         })
 150
 151 #define GET_UNALIGN_CTL(task,addr)                                        \
 152         ({                                                                \
 153         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 154                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 155         })
 156
 157 #define INIT_THREAD { \
 158         .regs = {       .gr     = { 0, }, \
 159                         .fr     = { 0, }, \
 160                         .sr     = { 0, }, \
 161                         .iasq   = { 0, }, \
 162                         .iaoq   = { 0, }, \
 163                         .cr27   = 0, \
 164                 }, \
 165         .task_size      = DEFAULT_TASK_SIZE, \
 166         .map_base       = DEFAULT_MAP_BASE, \
 167         .flags          = 0 \
 168         }
 169
 170 /*
 171  * Return saved PC of a blocked thread.  This is used by ps mostly.
 172  */
 173
 174 struct task_struct;
 175 unsigned long thread_saved_pc(struct task_struct *t);
 176 void show_trace(struct task_struct *task, unsigned long *stack);
 177
 178 /*
 179  * Start user thread in another space.
 180  *
 181  * Note that we set both the iaoq and r31 to the new pc. When
 182  * the kernel initially calls execve it will return through an
 183  * rfi path that will use the values in the iaoq. The execve
 184  * syscall path will return through the gateway page, and
 185  * that uses r31 to branch to.
 186  *
 187  * For ELF we clear r23, because the dynamic linker uses it to pass
 188  * the address of the finalizer function.
 189  *
 190  * We also initialize sr3 to an illegal value (illegal for our
 191  * implementation, not for the architecture).
 192  */
 193 typedef unsigned int elf_caddr_t;
 194
 195 #define start_thread_som(regs, new_pc, new_sp) do {     \
 196         unsigned long *sp = (unsigned long *)new_sp;    \
 197         __u32 spaceid = (__u32)current->mm->context;    \
 198         unsigned long pc = (unsigned long)new_pc;       \
 199         /* offset pc for priv. level */                 \
 200         pc |= 3;                                        \
 201                                                         \
 202         regs->iasq[0] = spaceid;                        \
 203         regs->iasq[1] = spaceid;                        \
 204         regs->iaoq[0] = pc;                             \
 205         regs->iaoq[1] = pc + 4;                         \
 206         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 207         regs->sr[3] = 0xffff;                           \
 208         regs->sr[4] = spaceid;                          \
 209         regs->sr[5] = spaceid;                          \
 210         regs->sr[6] = spaceid;                          \
 211         regs->sr[7] = spaceid;                          \
 212         regs->gr[ 0] = USER_PSW;                        \
 213         regs->gr[30] = ((new_sp)+63)&~63;               \
 214         regs->gr[31] = pc;                              \
 215                                                         \
 216         get_user(regs->gr[26],&sp[0]);                  \
 217         get_user(regs->gr[25],&sp[-1]);                 \
 218         get_user(regs->gr[24],&sp[-2]);                 \
 219         get_user(regs->gr[23],&sp[-3]);                 \
 220 } while(0)
 221
 222 /* The ELF abi wants things done a "wee bit" differently than
 223  * som does.  Supporting this behavior here avoids
 224  * having our own version of create_elf_tables.
 225  *
 226  * Oh, and yes, that is not a typo, we are really passing argc in r25
 227  * and argv in r24 (rather than r26 and r25).  This is because that's
 228  * where __libc_start_main wants them.
 229  *
 230  * Duplicated from dl-machine.h for the benefit of readers:
 231  *
 232  *  Our initial stack layout is rather different from everyone else's
 233  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 234  *  this:
 235
 236    -----------------------------------  (user startup code creates this frame)
 237    |         32 bytes of magic       |
 238    |---------------------------------|
 239    | 32 bytes argument/sp save area  |
 240    |---------------------------------| (bprm->p)
 241    |        ELF auxiliary info       |
 242    |         (up to 28 words)        |
 243    |---------------------------------|
 244    |               NULL              |
 245    |---------------------------------|
 246    |       Environment pointers      |
 247    |---------------------------------|
 248    |               NULL              |
 249    |---------------------------------|
 250    |        Argument pointers        |
 251    |---------------------------------| <- argv
 252    |          argc (1 word)          |
 253    |---------------------------------| <- bprm->exec (HACK!)
 254    |         N bytes of slack        |
 255    |---------------------------------|
 256    |    filename passed to execve    |
 257    |---------------------------------| (mm->env_end)
 258    |           env strings           |
 259    |---------------------------------| (mm->env_start, mm->arg_end)
 260    |           arg strings           |
 261    |---------------------------------|
 262    | additional faked arg strings if |
 263    | we're invoked via binfmt_script |
 264    |---------------------------------| (mm->arg_start)
 265    stack base is at TASK_SIZE - rlim_max.
 266
 267 on downward growing arches, it looks like this:
 268    stack base at TASK_SIZE
 269    | filename passed to execve
 270    | env strings
 271    | arg strings
 272    | faked arg strings
 273    | slack
 274    | ELF
 275    | envps
 276    | argvs
 277    | argc
 278
 279  *  The pleasant part of this is that if we need to skip arguments we
 280  *  can just decrement argc and move argv, because the stack pointer
 281  *  is utterly unrelated to the location of the environment and
 282  *  argument vectors.
 283  *
 284  * Note that the S/390 people took the easy way out and hacked their
 285  * GCC to make the stack grow downwards.
 286  *
 287  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 288  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 289  * it in here from the current->personality
 290  */
 291
 292 #ifdef CONFIG_64BIT
 293 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 294 #else
 295 #define USER_WIDE_MODE  0
 296 #endif
 297
 298 #define start_thread(regs, new_pc, new_sp) do {         \
 299         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 300         __u32 spaceid = (__u32)current->mm->context;    \
 301         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 302         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 303                                                         \
 304         regs->iasq[0] = spaceid;                        \
 305         regs->iasq[1] = spaceid;                        \
 306         regs->iaoq[0] = pc;                             \
 307         regs->iaoq[1] = pc + 4;                         \
 308         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 309         regs->sr[3] = 0xffff;                           \
 310         regs->sr[4] = spaceid;                          \
 311         regs->sr[5] = spaceid;                          \
 312         regs->sr[6] = spaceid;                          \
 313         regs->sr[7] = spaceid;                          \
 314         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 315         regs->fr[ 0] = 0LL;                             \
 316         regs->fr[ 1] = 0LL;                             \
 317         regs->fr[ 2] = 0LL;                             \
 318         regs->fr[ 3] = 0LL;                             \
 319         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 320         regs->gr[31] = pc;                              \
 321                                                         \
 322         get_user(regs->gr[25], (argv - 1));             \
 323         regs->gr[24] = (long) argv;                     \
 324         regs->gr[23] = 0;                               \
 325 } while(0)
 326
 327 struct task_struct;
 328 struct mm_struct;
 329
 330 /* Free all resources held by a thread. */
 331 extern void release_thread(struct task_struct *);
 332
 333 extern unsigned long get_wchan(struct task_struct *p);
 334
 335 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 336 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 337
 338 #define cpu_relax()     barrier()
 339 #define cpu_relax_lowlatency() cpu_relax()
 340
 341 /* Used as a macro to identify the combined VIPT/PIPT cached
 342  * CPUs which require a guarantee of coherency (no inequivalent
 343  * aliases with different data, whether clean or not) to operate */
 344 static inline int parisc_requires_coherency(void)
 345 {
 346 #ifdef CONFIG_PA8X00
 347         return (boot_cpu_data.cpu_type == mako) ||
 348                 (boot_cpu_data.cpu_type == mako2);
 349 #else
 350         return 0;
 351 #endif
 352 }
 353
 354 #endif /* __ASSEMBLY__ */
 355
 356 #endif /* __ASM_PARISC_PROCESSOR_H */