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
  21 #endif /* __ASSEMBLY__ */
  22
  23 /*
  24  * Default implementation of macro that returns current
  25  * instruction pointer ("program counter").
  26  */
  27 #ifdef CONFIG_PA20
  28 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  29 #else /* mfia added in pa2.0 */
  30 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  31 #endif
  32 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  33
  34 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  35 #define TASK_SIZE               TASK_SIZE_OF(current)
  36 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  37
  38 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  39 #define DEFAULT_MAP_BASE32      (0x40000000UL)
  40
  41 #ifdef CONFIG_64BIT
  42 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  43 #define DEFAULT_MAP_BASE        (0x200000000UL)
  44 #else
  45 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  46 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  47 #endif
  48
  49 #ifdef __KERNEL__
  50
  51 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  52  * prumpf */
  53
  54 #define STACK_TOP       TASK_SIZE
  55 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  56
  57 #endif
  58
  59 #ifndef __ASSEMBLY__
  60
  61 /*
  62  * IRQ STACK - used for irq handler
  63  */
  64 #ifdef __KERNEL__
  65
  66 #define IRQ_STACK_SIZE      (4096 << 2) /* 16k irq stack size */
  67
  68 union irq_stack_union {
  69         unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
  70 };
  71
  72 DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);
  73
  74 void call_on_stack(unsigned long p1, void *func, unsigned long new_stack);
  75
  76 #endif /* __KERNEL__ */
  77
  78 /*
  79  * Data detected about CPUs at boot time which is the same for all CPU's.
  80  * HP boxes are SMP - ie identical processors.
  81  *
  82  * FIXME: some CPU rev info may be processor specific...
  83  */
  84 struct system_cpuinfo_parisc {
  85         unsigned int    cpu_count;
  86         unsigned int    cpu_hz;
  87         unsigned int    hversion;
  88         unsigned int    sversion;
  89         enum cpu_type   cpu_type;
  90
  91         struct {
  92                 struct pdc_model model;
  93                 unsigned long versions;
  94                 unsigned long cpuid;
  95                 unsigned long capabilities;
  96                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  97         } pdc;
  98
  99         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
 100         const char      *family_name;   /* e.g. "1.1e" */
 101 };
 102
 103
 104 /* Per CPU data structure - ie varies per CPU.  */
 105 struct cpuinfo_parisc {
 106         unsigned long it_value;     /* Interval Timer at last timer Intr */
 107         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
 108         unsigned long irq_count;    /* number of IRQ's since boot */
 109         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
 110         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
 111         unsigned long hpa;          /* Host Physical address */
 112         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 113 #ifdef CONFIG_SMP
 114         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 115 #endif
 116         unsigned long bh_count;     /* number of times bh was invoked */
 117         unsigned long prof_counter; /* per CPU profiling support */
 118         unsigned long prof_multiplier;  /* per CPU profiling support */
 119         unsigned long fp_rev;
 120         unsigned long fp_model;
 121         unsigned int state;
 122         struct parisc_device *dev;
 123         unsigned long loops_per_jiffy;
 124 };
 125
 126 extern struct system_cpuinfo_parisc boot_cpu_data;
 127 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 128
 129 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 130
 131 typedef struct {
 132         int seg;
 133 } mm_segment_t;
 134
 135 #define ARCH_MIN_TASKALIGN      8
 136
 137 struct thread_struct {
 138         struct pt_regs regs;
 139         unsigned long  task_size;
 140         unsigned long  map_base;
 141         unsigned long  flags;
 142 };
 143
 144 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 145
 146 /* Thread struct flags. */
 147 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 148 #define PARISC_UAC_SIGBUS       (1UL << 1)
 149 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 150
 151 #define PARISC_UAC_SHIFT        0
 152 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 153
 154 #define SET_UNALIGN_CTL(task,value)                                       \
 155         ({                                                                \
 156         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 157                                 | (((value) << PARISC_UAC_SHIFT) &        \
 158                                    PARISC_UAC_MASK));                     \
 159         0;                                                                \
 160         })
 161
 162 #define GET_UNALIGN_CTL(task,addr)                                        \
 163         ({                                                                \
 164         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 165                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 166         })
 167
 168 #define INIT_THREAD { \
 169         .regs = {       .gr     = { 0, }, \
 170                         .fr     = { 0, }, \
 171                         .sr     = { 0, }, \
 172                         .iasq   = { 0, }, \
 173                         .iaoq   = { 0, }, \
 174                         .cr27   = 0, \
 175                 }, \
 176         .task_size      = DEFAULT_TASK_SIZE, \
 177         .map_base       = DEFAULT_MAP_BASE, \
 178         .flags          = 0 \
 179         }
 180
 181 /*
 182  * Return saved PC of a blocked thread.  This is used by ps mostly.
 183  */
 184
 185 struct task_struct;
 186 unsigned long thread_saved_pc(struct task_struct *t);
 187 void show_trace(struct task_struct *task, unsigned long *stack);
 188
 189 /*
 190  * Start user thread in another space.
 191  *
 192  * Note that we set both the iaoq and r31 to the new pc. When
 193  * the kernel initially calls execve it will return through an
 194  * rfi path that will use the values in the iaoq. The execve
 195  * syscall path will return through the gateway page, and
 196  * that uses r31 to branch to.
 197  *
 198  * For ELF we clear r23, because the dynamic linker uses it to pass
 199  * the address of the finalizer function.
 200  *
 201  * We also initialize sr3 to an illegal value (illegal for our
 202  * implementation, not for the architecture).
 203  */
 204 typedef unsigned int elf_caddr_t;
 205
 206 #define start_thread_som(regs, new_pc, new_sp) do {     \
 207         unsigned long *sp = (unsigned long *)new_sp;    \
 208         __u32 spaceid = (__u32)current->mm->context;    \
 209         unsigned long pc = (unsigned long)new_pc;       \
 210         /* offset pc for priv. level */                 \
 211         pc |= 3;                                        \
 212                                                         \
 213         regs->iasq[0] = spaceid;                        \
 214         regs->iasq[1] = spaceid;                        \
 215         regs->iaoq[0] = pc;                             \
 216         regs->iaoq[1] = pc + 4;                         \
 217         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 218         regs->sr[3] = 0xffff;                           \
 219         regs->sr[4] = spaceid;                          \
 220         regs->sr[5] = spaceid;                          \
 221         regs->sr[6] = spaceid;                          \
 222         regs->sr[7] = spaceid;                          \
 223         regs->gr[ 0] = USER_PSW;                        \
 224         regs->gr[30] = ((new_sp)+63)&~63;               \
 225         regs->gr[31] = pc;                              \
 226                                                         \
 227         get_user(regs->gr[26],&sp[0]);                  \
 228         get_user(regs->gr[25],&sp[-1]);                 \
 229         get_user(regs->gr[24],&sp[-2]);                 \
 230         get_user(regs->gr[23],&sp[-3]);                 \
 231 } while(0)
 232
 233 /* The ELF abi wants things done a "wee bit" differently than
 234  * som does.  Supporting this behavior here avoids
 235  * having our own version of create_elf_tables.
 236  *
 237  * Oh, and yes, that is not a typo, we are really passing argc in r25
 238  * and argv in r24 (rather than r26 and r25).  This is because that's
 239  * where __libc_start_main wants them.
 240  *
 241  * Duplicated from dl-machine.h for the benefit of readers:
 242  *
 243  *  Our initial stack layout is rather different from everyone else's
 244  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 245  *  this:
 246
 247    -----------------------------------  (user startup code creates this frame)
 248    |         32 bytes of magic       |
 249    |---------------------------------|
 250    | 32 bytes argument/sp save area  |
 251    |---------------------------------| (bprm->p)
 252    |        ELF auxiliary info       |
 253    |         (up to 28 words)        |
 254    |---------------------------------|
 255    |               NULL              |
 256    |---------------------------------|
 257    |       Environment pointers      |
 258    |---------------------------------|
 259    |               NULL              |
 260    |---------------------------------|
 261    |        Argument pointers        |
 262    |---------------------------------| <- argv
 263    |          argc (1 word)          |
 264    |---------------------------------| <- bprm->exec (HACK!)
 265    |         N bytes of slack        |
 266    |---------------------------------|
 267    |    filename passed to execve    |
 268    |---------------------------------| (mm->env_end)
 269    |           env strings           |
 270    |---------------------------------| (mm->env_start, mm->arg_end)
 271    |           arg strings           |
 272    |---------------------------------|
 273    | additional faked arg strings if |
 274    | we're invoked via binfmt_script |
 275    |---------------------------------| (mm->arg_start)
 276    stack base is at TASK_SIZE - rlim_max.
 277
 278 on downward growing arches, it looks like this:
 279    stack base at TASK_SIZE
 280    | filename passed to execve
 281    | env strings
 282    | arg strings
 283    | faked arg strings
 284    | slack
 285    | ELF
 286    | envps
 287    | argvs
 288    | argc
 289
 290  *  The pleasant part of this is that if we need to skip arguments we
 291  *  can just decrement argc and move argv, because the stack pointer
 292  *  is utterly unrelated to the location of the environment and
 293  *  argument vectors.
 294  *
 295  * Note that the S/390 people took the easy way out and hacked their
 296  * GCC to make the stack grow downwards.
 297  *
 298  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 299  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 300  * it in here from the current->personality
 301  */
 302
 303 #ifdef CONFIG_64BIT
 304 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 305 #else
 306 #define USER_WIDE_MODE  0
 307 #endif
 308
 309 #define start_thread(regs, new_pc, new_sp) do {         \
 310         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 311         __u32 spaceid = (__u32)current->mm->context;    \
 312         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 313         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 314                                                         \
 315         regs->iasq[0] = spaceid;                        \
 316         regs->iasq[1] = spaceid;                        \
 317         regs->iaoq[0] = pc;                             \
 318         regs->iaoq[1] = pc + 4;                         \
 319         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 320         regs->sr[3] = 0xffff;                           \
 321         regs->sr[4] = spaceid;                          \
 322         regs->sr[5] = spaceid;                          \
 323         regs->sr[6] = spaceid;                          \
 324         regs->sr[7] = spaceid;                          \
 325         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 326         regs->fr[ 0] = 0LL;                             \
 327         regs->fr[ 1] = 0LL;                             \
 328         regs->fr[ 2] = 0LL;                             \
 329         regs->fr[ 3] = 0LL;                             \
 330         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 331         regs->gr[31] = pc;                              \
 332                                                         \
 333         get_user(regs->gr[25], (argv - 1));             \
 334         regs->gr[24] = (long) argv;                     \
 335         regs->gr[23] = 0;                               \
 336 } while(0)
 337
 338 struct task_struct;
 339 struct mm_struct;
 340
 341 /* Free all resources held by a thread. */
 342 extern void release_thread(struct task_struct *);
 343
 344 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 345
 346 extern unsigned long get_wchan(struct task_struct *p);
 347
 348 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 349 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 350
 351 #define cpu_relax()     barrier()
 352
 353 /* Used as a macro to identify the combined VIPT/PIPT cached
 354  * CPUs which require a guarantee of coherency (no inequivalent
 355  * aliases with different data, whether clean or not) to operate */
 356 static inline int parisc_requires_coherency(void)
 357 {
 358 #ifdef CONFIG_PA8X00
 359         return (boot_cpu_data.cpu_type == mako) ||
 360                 (boot_cpu_data.cpu_type == mako2);
 361 #else
 362         return 0;
 363 #endif
 364 }
 365
 366 #endif /* __ASSEMBLY__ */
 367
 368 #endif /* __ASM_PARISC_PROCESSOR_H */