include/asm-parisc/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 <asm/prefetch.h>       /* lockdep.h needs <linux/prefetch.h> */
  13
  14 #include <linux/threads.h>
  15 #include <linux/spinlock_types.h>
  16
  17 #include <asm/hardware.h>
  18 #include <asm/page.h>
  19 #include <asm/pdc.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/types.h>
  22 #include <asm/system.h>
  23 #endif /* __ASSEMBLY__ */
  24
  25 #define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  26
  27 /*
  28  * Default implementation of macro that returns current
  29  * instruction pointer ("program counter").
  30  */
  31 #ifdef CONFIG_PA20
  32 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  33 #else /* mfia added in pa2.0 */
  34 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  35 #endif
  36 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  37
  38 #define TASK_SIZE               (current->thread.task_size)
  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 __LP64__
  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 #ifndef __ASSEMBLY__
  53
  54 /*
  55  * Data detected about CPUs at boot time which is the same for all CPU's.
  56  * HP boxes are SMP - ie identical processors.
  57  *
  58  * FIXME: some CPU rev info may be processor specific...
  59  */
  60 struct system_cpuinfo_parisc {
  61         unsigned int    cpu_count;
  62         unsigned int    cpu_hz;
  63         unsigned int    hversion;
  64         unsigned int    sversion;
  65         enum cpu_type   cpu_type;
  66
  67         struct {
  68                 struct pdc_model model;
  69                 unsigned long versions;
  70                 unsigned long cpuid;
  71                 unsigned long capabilities;
  72                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  73         } pdc;
  74
  75         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  76         char            *family_name;   /* e.g. "1.1e" */
  77 };
  78
  79
  80 /* Per CPU data structure - ie varies per CPU.  */
  81 struct cpuinfo_parisc {
  82         unsigned long it_value;     /* Interval Timer at last timer Intr */
  83         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  84         unsigned long irq_count;    /* number of IRQ's since boot */
  85         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  86         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  87         unsigned long hpa;          /* Host Physical address */
  88         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  89 #ifdef CONFIG_SMP
  90         spinlock_t lock;            /* synchronization for ipi's */
  91         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  92         unsigned long ipi_count;    /* number ipi Interrupts */
  93 #endif
  94         unsigned long bh_count;     /* number of times bh was invoked */
  95         unsigned long prof_counter; /* per CPU profiling support */
  96         unsigned long prof_multiplier;  /* per CPU profiling support */
  97         unsigned long fp_rev;
  98         unsigned long fp_model;
  99         unsigned int state;
 100         struct parisc_device *dev;
 101         unsigned long loops_per_jiffy;
 102 };
 103
 104 extern struct system_cpuinfo_parisc boot_cpu_data;
 105 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 106 #define current_cpu_data cpu_data[smp_processor_id()]
 107
 108 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 109
 110 typedef struct {
 111         int seg;
 112 } mm_segment_t;
 113
 114 #define ARCH_MIN_TASKALIGN      8
 115
 116 struct thread_struct {
 117         struct pt_regs regs;
 118         unsigned long  task_size;
 119         unsigned long  map_base;
 120         unsigned long  flags;
 121 };
 122
 123 /* Thread struct flags. */
 124 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 125 #define PARISC_UAC_SIGBUS       (1UL << 1)
 126 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 127
 128 #define PARISC_UAC_SHIFT        0
 129 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 130
 131 #define SET_UNALIGN_CTL(task,value)                                       \
 132         ({                                                                \
 133         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 134                                 | (((value) << PARISC_UAC_SHIFT) &        \
 135                                    PARISC_UAC_MASK));                     \
 136         0;                                                                \
 137         })
 138
 139 #define GET_UNALIGN_CTL(task,addr)                                        \
 140         ({                                                                \
 141         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 142                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 143         })
 144
 145 #define INIT_THREAD { \
 146         .regs = {       .gr     = { 0, }, \
 147                         .fr     = { 0, }, \
 148                         .sr     = { 0, }, \
 149                         .iasq   = { 0, }, \
 150                         .iaoq   = { 0, }, \
 151                         .cr27   = 0, \
 152                 }, \
 153         .task_size      = DEFAULT_TASK_SIZE, \
 154         .map_base       = DEFAULT_MAP_BASE, \
 155         .flags          = 0 \
 156         }
 157
 158 /*
 159  * Return saved PC of a blocked thread.  This is used by ps mostly.
 160  */
 161
 162 unsigned long thread_saved_pc(struct task_struct *t);
 163 void show_trace(struct task_struct *task, unsigned long *stack);
 164
 165 /*
 166  * Start user thread in another space.
 167  *
 168  * Note that we set both the iaoq and r31 to the new pc. When
 169  * the kernel initially calls execve it will return through an
 170  * rfi path that will use the values in the iaoq. The execve
 171  * syscall path will return through the gateway page, and
 172  * that uses r31 to branch to.
 173  *
 174  * For ELF we clear r23, because the dynamic linker uses it to pass
 175  * the address of the finalizer function.
 176  *
 177  * We also initialize sr3 to an illegal value (illegal for our
 178  * implementation, not for the architecture).
 179  */
 180 typedef unsigned int elf_caddr_t;
 181
 182 #define start_thread_som(regs, new_pc, new_sp) do {     \
 183         unsigned long *sp = (unsigned long *)new_sp;    \
 184         __u32 spaceid = (__u32)current->mm->context;    \
 185         unsigned long pc = (unsigned long)new_pc;       \
 186         /* offset pc for priv. level */                 \
 187         pc |= 3;                                        \
 188                                                         \
 189         set_fs(USER_DS);                                \
 190         regs->iasq[0] = spaceid;                        \
 191         regs->iasq[1] = spaceid;                        \
 192         regs->iaoq[0] = pc;                             \
 193         regs->iaoq[1] = pc + 4;                         \
 194         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 195         regs->sr[3] = 0xffff;                           \
 196         regs->sr[4] = spaceid;                          \
 197         regs->sr[5] = spaceid;                          \
 198         regs->sr[6] = spaceid;                          \
 199         regs->sr[7] = spaceid;                          \
 200         regs->gr[ 0] = USER_PSW;                        \
 201         regs->gr[30] = ((new_sp)+63)&~63;               \
 202         regs->gr[31] = pc;                              \
 203                                                         \
 204         get_user(regs->gr[26],&sp[0]);                  \
 205         get_user(regs->gr[25],&sp[-1]);                 \
 206         get_user(regs->gr[24],&sp[-2]);                 \
 207         get_user(regs->gr[23],&sp[-3]);                 \
 208 } while(0)
 209
 210 /* The ELF abi wants things done a "wee bit" differently than
 211  * som does.  Supporting this behavior here avoids
 212  * having our own version of create_elf_tables.
 213  *
 214  * Oh, and yes, that is not a typo, we are really passing argc in r25
 215  * and argv in r24 (rather than r26 and r25).  This is because that's
 216  * where __libc_start_main wants them.
 217  *
 218  * Duplicated from dl-machine.h for the benefit of readers:
 219  *
 220  *  Our initial stack layout is rather different from everyone else's
 221  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 222  *  this:
 223
 224    -----------------------------------  (user startup code creates this frame)
 225    |         32 bytes of magic       |
 226    |---------------------------------|
 227    | 32 bytes argument/sp save area  |
 228    |---------------------------------| (bprm->p)
 229    |        ELF auxiliary info       |
 230    |         (up to 28 words)        |
 231    |---------------------------------|
 232    |               NULL              |
 233    |---------------------------------|
 234    |       Environment pointers      |
 235    |---------------------------------|
 236    |               NULL              |
 237    |---------------------------------|
 238    |        Argument pointers        |
 239    |---------------------------------| <- argv
 240    |          argc (1 word)          |
 241    |---------------------------------| <- bprm->exec (HACK!)
 242    |         N bytes of slack        |
 243    |---------------------------------|
 244    |    filename passed to execve    |
 245    |---------------------------------| (mm->env_end)
 246    |           env strings           |
 247    |---------------------------------| (mm->env_start, mm->arg_end)
 248    |           arg strings           |
 249    |---------------------------------|
 250    | additional faked arg strings if |
 251    | we're invoked via binfmt_script |
 252    |---------------------------------| (mm->arg_start)
 253    stack base is at TASK_SIZE - rlim_max.
 254
 255 on downward growing arches, it looks like this:
 256    stack base at TASK_SIZE
 257    | filename passed to execve
 258    | env strings
 259    | arg strings
 260    | faked arg strings
 261    | slack
 262    | ELF
 263    | envps
 264    | argvs
 265    | argc
 266
 267  *  The pleasant part of this is that if we need to skip arguments we
 268  *  can just decrement argc and move argv, because the stack pointer
 269  *  is utterly unrelated to the location of the environment and
 270  *  argument vectors.
 271  *
 272  * Note that the S/390 people took the easy way out and hacked their
 273  * GCC to make the stack grow downwards.
 274  *
 275  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 276  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 277  * it in here from the current->personality
 278  */
 279
 280 #ifdef __LP64__
 281 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 282 #else
 283 #define USER_WIDE_MODE  0
 284 #endif
 285
 286 #define start_thread(regs, new_pc, new_sp) do {         \
 287         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 288         __u32 spaceid = (__u32)current->mm->context;    \
 289         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 290         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 291                                                         \
 292         set_fs(USER_DS);                                \
 293         regs->iasq[0] = spaceid;                        \
 294         regs->iasq[1] = spaceid;                        \
 295         regs->iaoq[0] = pc;                             \
 296         regs->iaoq[1] = pc + 4;                         \
 297         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 298         regs->sr[3] = 0xffff;                           \
 299         regs->sr[4] = spaceid;                          \
 300         regs->sr[5] = spaceid;                          \
 301         regs->sr[6] = spaceid;                          \
 302         regs->sr[7] = spaceid;                          \
 303         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 304         regs->fr[ 0] = 0LL;                             \
 305         regs->fr[ 1] = 0LL;                             \
 306         regs->fr[ 2] = 0LL;                             \
 307         regs->fr[ 3] = 0LL;                             \
 308         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 309         regs->gr[31] = pc;                              \
 310                                                         \
 311         get_user(regs->gr[25], (argv - 1));             \
 312         regs->gr[24] = (long) argv;                     \
 313         regs->gr[23] = 0;                               \
 314 } while(0)
 315
 316 struct task_struct;
 317 struct mm_struct;
 318
 319 /* Free all resources held by a thread. */
 320 extern void release_thread(struct task_struct *);
 321 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 322
 323 /* Prepare to copy thread state - unlazy all lazy status */
 324 #define prepare_to_copy(tsk)    do { } while (0)
 325
 326 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 327
 328 extern unsigned long get_wchan(struct task_struct *p);
 329
 330 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 331 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 332
 333 #define cpu_relax()     barrier()
 334
 335 /* Used as a macro to identify the combined VIPT/PIPT cached
 336  * CPUs which require a guarantee of coherency (no inequivalent
 337  * aliases with different data, whether clean or not) to operate */
 338 static inline int parisc_requires_coherency(void)
 339 {
 340 #ifdef CONFIG_PA8X00
 341         /* FIXME: also pa8900 - when we see one */
 342         return boot_cpu_data.cpu_type == mako;
 343 #else
 344         return 0;
 345 #endif
 346 }
 347
 348 #endif /* __ASSEMBLY__ */
 349
 350 #endif /* __ASM_PARISC_PROCESSOR_H */