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