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