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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               (current->thread.task_size)
  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 #ifndef __ASSEMBLY__
  50
  51 /*
  52  * Data detected about CPUs at boot time which is the same for all CPU's.
  53  * HP boxes are SMP - ie identical processors.
  54  *
  55  * FIXME: some CPU rev info may be processor specific...
  56  */
  57 struct system_cpuinfo_parisc {
  58         unsigned int    cpu_count;
  59         unsigned int    cpu_hz;
  60         unsigned int    hversion;
  61         unsigned int    sversion;
  62         enum cpu_type   cpu_type;
  63
  64         struct {
  65                 struct pdc_model model;
  66                 unsigned long versions;
  67                 unsigned long cpuid;
  68                 unsigned long capabilities;
  69                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  70         } pdc;
  71
  72         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  73         char            *family_name;   /* e.g. "1.1e" */
  74 };
  75
  76
  77 /* Per CPU data structure - ie varies per CPU.  */
  78 struct cpuinfo_parisc {
  79         unsigned long it_value;     /* Interval Timer at last timer Intr */
  80         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  81         unsigned long irq_count;    /* number of IRQ's since boot */
  82         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  83         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  84         unsigned long hpa;          /* Host Physical address */
  85         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  86 #ifdef CONFIG_SMP
  87         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  88         unsigned long ipi_count;    /* number ipi Interrupts */
  89 #endif
  90         unsigned long bh_count;     /* number of times bh was invoked */
  91         unsigned long prof_counter; /* per CPU profiling support */
  92         unsigned long prof_multiplier;  /* per CPU profiling support */
  93         unsigned long fp_rev;
  94         unsigned long fp_model;
  95         unsigned int state;
  96         struct parisc_device *dev;
  97         unsigned long loops_per_jiffy;
  98 };
  99
 100 extern struct system_cpuinfo_parisc boot_cpu_data;
 101 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 102 #define current_cpu_data cpu_data[smp_processor_id()]
 103
 104 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 105
 106 typedef struct {
 107         int seg;
 108 } mm_segment_t;
 109
 110 #define ARCH_MIN_TASKALIGN      8
 111
 112 struct thread_struct {
 113         struct pt_regs regs;
 114         unsigned long  task_size;
 115         unsigned long  map_base;
 116         unsigned long  flags;
 117 };
 118
 119 /* Thread struct flags. */
 120 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 121 #define PARISC_UAC_SIGBUS       (1UL << 1)
 122 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 123
 124 #define PARISC_UAC_SHIFT        0
 125 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 126
 127 #define SET_UNALIGN_CTL(task,value)                                       \
 128         ({                                                                \
 129         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 130                                 | (((value) << PARISC_UAC_SHIFT) &        \
 131                                    PARISC_UAC_MASK));                     \
 132         0;                                                                \
 133         })
 134
 135 #define GET_UNALIGN_CTL(task,addr)                                        \
 136         ({                                                                \
 137         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 138                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 139         })
 140
 141 #define INIT_THREAD { \
 142         .regs = {       .gr     = { 0, }, \
 143                         .fr     = { 0, }, \
 144                         .sr     = { 0, }, \
 145                         .iasq   = { 0, }, \
 146                         .iaoq   = { 0, }, \
 147                         .cr27   = 0, \
 148                 }, \
 149         .task_size      = DEFAULT_TASK_SIZE, \
 150         .map_base       = DEFAULT_MAP_BASE, \
 151         .flags          = 0 \
 152         }
 153
 154 /*
 155  * Return saved PC of a blocked thread.  This is used by ps mostly.
 156  */
 157
 158 unsigned long thread_saved_pc(struct task_struct *t);
 159 void show_trace(struct task_struct *task, unsigned long *stack);
 160
 161 /*
 162  * Start user thread in another space.
 163  *
 164  * Note that we set both the iaoq and r31 to the new pc. When
 165  * the kernel initially calls execve it will return through an
 166  * rfi path that will use the values in the iaoq. The execve
 167  * syscall path will return through the gateway page, and
 168  * that uses r31 to branch to.
 169  *
 170  * For ELF we clear r23, because the dynamic linker uses it to pass
 171  * the address of the finalizer function.
 172  *
 173  * We also initialize sr3 to an illegal value (illegal for our
 174  * implementation, not for the architecture).
 175  */
 176 typedef unsigned int elf_caddr_t;
 177
 178 #define start_thread_som(regs, new_pc, new_sp) do {     \
 179         unsigned long *sp = (unsigned long *)new_sp;    \
 180         __u32 spaceid = (__u32)current->mm->context;    \
 181         unsigned long pc = (unsigned long)new_pc;       \
 182         /* offset pc for priv. level */                 \
 183         pc |= 3;                                        \
 184                                                         \
 185         set_fs(USER_DS);                                \
 186         regs->iasq[0] = spaceid;                        \
 187         regs->iasq[1] = spaceid;                        \
 188         regs->iaoq[0] = pc;                             \
 189         regs->iaoq[1] = pc + 4;                         \
 190         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 191         regs->sr[3] = 0xffff;                           \
 192         regs->sr[4] = spaceid;                          \
 193         regs->sr[5] = spaceid;                          \
 194         regs->sr[6] = spaceid;                          \
 195         regs->sr[7] = spaceid;                          \
 196         regs->gr[ 0] = USER_PSW;                        \
 197         regs->gr[30] = ((new_sp)+63)&~63;               \
 198         regs->gr[31] = pc;                              \
 199                                                         \
 200         get_user(regs->gr[26],&sp[0]);                  \
 201         get_user(regs->gr[25],&sp[-1]);                 \
 202         get_user(regs->gr[24],&sp[-2]);                 \
 203         get_user(regs->gr[23],&sp[-3]);                 \
 204 } while(0)
 205
 206 /* The ELF abi wants things done a "wee bit" differently than
 207  * som does.  Supporting this behavior here avoids
 208  * having our own version of create_elf_tables.
 209  *
 210  * Oh, and yes, that is not a typo, we are really passing argc in r25
 211  * and argv in r24 (rather than r26 and r25).  This is because that's
 212  * where __libc_start_main wants them.
 213  *
 214  * Duplicated from dl-machine.h for the benefit of readers:
 215  *
 216  *  Our initial stack layout is rather different from everyone else's
 217  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 218  *  this:
 219
 220    -----------------------------------  (user startup code creates this frame)
 221    |         32 bytes of magic       |
 222    |---------------------------------|
 223    | 32 bytes argument/sp save area  |
 224    |---------------------------------| (bprm->p)
 225    |        ELF auxiliary info       |
 226    |         (up to 28 words)        |
 227    |---------------------------------|
 228    |               NULL              |
 229    |---------------------------------|
 230    |       Environment pointers      |
 231    |---------------------------------|
 232    |               NULL              |
 233    |---------------------------------|
 234    |        Argument pointers        |
 235    |---------------------------------| <- argv
 236    |          argc (1 word)          |
 237    |---------------------------------| <- bprm->exec (HACK!)
 238    |         N bytes of slack        |
 239    |---------------------------------|
 240    |    filename passed to execve    |
 241    |---------------------------------| (mm->env_end)
 242    |           env strings           |
 243    |---------------------------------| (mm->env_start, mm->arg_end)
 244    |           arg strings           |
 245    |---------------------------------|
 246    | additional faked arg strings if |
 247    | we're invoked via binfmt_script |
 248    |---------------------------------| (mm->arg_start)
 249    stack base is at TASK_SIZE - rlim_max.
 250
 251 on downward growing arches, it looks like this:
 252    stack base at TASK_SIZE
 253    | filename passed to execve
 254    | env strings
 255    | arg strings
 256    | faked arg strings
 257    | slack
 258    | ELF
 259    | envps
 260    | argvs
 261    | argc
 262
 263  *  The pleasant part of this is that if we need to skip arguments we
 264  *  can just decrement argc and move argv, because the stack pointer
 265  *  is utterly unrelated to the location of the environment and
 266  *  argument vectors.
 267  *
 268  * Note that the S/390 people took the easy way out and hacked their
 269  * GCC to make the stack grow downwards.
 270  *
 271  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 272  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 273  * it in here from the current->personality
 274  */
 275
 276 #ifdef CONFIG_64BIT
 277 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 278 #else
 279 #define USER_WIDE_MODE  0
 280 #endif
 281
 282 #define start_thread(regs, new_pc, new_sp) do {         \
 283         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 284         __u32 spaceid = (__u32)current->mm->context;    \
 285         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 286         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 287                                                         \
 288         set_fs(USER_DS);                                \
 289         regs->iasq[0] = spaceid;                        \
 290         regs->iasq[1] = spaceid;                        \
 291         regs->iaoq[0] = pc;                             \
 292         regs->iaoq[1] = pc + 4;                         \
 293         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 294         regs->sr[3] = 0xffff;                           \
 295         regs->sr[4] = spaceid;                          \
 296         regs->sr[5] = spaceid;                          \
 297         regs->sr[6] = spaceid;                          \
 298         regs->sr[7] = spaceid;                          \
 299         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 300         regs->fr[ 0] = 0LL;                             \
 301         regs->fr[ 1] = 0LL;                             \
 302         regs->fr[ 2] = 0LL;                             \
 303         regs->fr[ 3] = 0LL;                             \
 304         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 305         regs->gr[31] = pc;                              \
 306                                                         \
 307         get_user(regs->gr[25], (argv - 1));             \
 308         regs->gr[24] = (long) argv;                     \
 309         regs->gr[23] = 0;                               \
 310 } while(0)
 311
 312 struct task_struct;
 313 struct mm_struct;
 314
 315 /* Free all resources held by a thread. */
 316 extern void release_thread(struct task_struct *);
 317 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 318
 319 /* Prepare to copy thread state - unlazy all lazy status */
 320 #define prepare_to_copy(tsk)    do { } while (0)
 321
 322 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 323
 324 extern unsigned long get_wchan(struct task_struct *p);
 325
 326 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 327 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 328
 329 #define cpu_relax()     barrier()
 330
 331 /* Used as a macro to identify the combined VIPT/PIPT cached
 332  * CPUs which require a guarantee of coherency (no inequivalent
 333  * aliases with different data, whether clean or not) to operate */
 334 static inline int parisc_requires_coherency(void)
 335 {
 336 #ifdef CONFIG_PA8X00
 337         /* FIXME: also pa8900 - when we see one */
 338         return boot_cpu_data.cpu_type == mako;
 339 #else
 340         return 0;
 341 #endif
 342 }
 343
 344 #endif /* __ASSEMBLY__ */
 345
 346 #endif /* __ASM_PARISC_PROCESSOR_H */