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 <linux/config.h>
  13 #include <linux/threads.h>
  14
  15 #include <asm/hardware.h>
  16 #include <asm/page.h>
  17 #include <asm/pdc.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/types.h>
  20 #include <asm/system.h>
  21 #ifdef CONFIG_SMP
  22 #include <asm/spinlock_t.h>
  23 #endif
  24 #endif /* __ASSEMBLY__ */
  25
  26 /*
  27  * Default implementation of macro that returns current
  28  * instruction pointer ("program counter").
  29  */
  30
  31 /* We cannot use MFIA as it was added for PA2.0 - prumpf
  32
  33    At one point there were no "0f/0b" type local symbols in gas for
  34    PA-RISC.  This is no longer true, but this still seems like the
  35    nicest way to implement this. */
  36
  37 #define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; })
  38
  39 #define TASK_SIZE               (current->thread.task_size)
  40 #define DEFAULT_TASK_SIZE       (0xFFF00000UL)
  41
  42 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  43 #define DEFAULT_MAP_BASE        (0x40000000UL)
  44
  45 #ifndef __ASSEMBLY__
  46
  47 /*
  48 ** Data detected about CPUs at boot time which is the same for all CPU's.
  49 ** HP boxes are SMP - ie identical processors.
  50 **
  51 ** FIXME: some CPU rev info may be processor specific...
  52 */
  53 struct system_cpuinfo_parisc {
  54         unsigned int    cpu_count;
  55         unsigned int    cpu_hz;
  56         unsigned int    hversion;
  57         unsigned int    sversion;
  58         enum cpu_type   cpu_type;
  59
  60         struct {
  61                 struct pdc_model model;
  62                 unsigned long versions;
  63                 unsigned long cpuid;
  64                 unsigned long capabilities;
  65                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  66         } pdc;
  67
  68         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  69         char            *family_name;   /* e.g. "1.1e" */
  70 };
  71
  72
  73 /*
  74 ** Per CPU data structure - ie varies per CPU.
  75 */
  76 struct cpuinfo_parisc {
  77
  78         unsigned long it_value;     /* Interval Timer value at last timer Intr */
  79         unsigned long it_delta;     /* Interval Timer delta (tic_10ms / HZ * 100) */
  80         unsigned long irq_count;    /* number of IRQ's since boot */
  81         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  82         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  83         unsigned long hpa;          /* Host Physical address */
  84         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  85 #ifdef CONFIG_SMP
  86         spinlock_t lock;            /* synchronization for ipi's */
  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 };
  98
  99 extern struct system_cpuinfo_parisc boot_cpu_data;
 100 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 101 #define current_cpu_data cpu_data[smp_processor_id()]
 102
 103 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 104
 105 #ifdef CONFIG_EISA
 106 extern int EISA_bus;
 107 #else
 108 #define EISA_bus 0
 109 #endif
 110
 111 #define MCA_bus 0
 112 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
 113
 114 typedef struct {
 115         int seg;
 116 } mm_segment_t;
 117
 118 struct thread_struct {
 119         struct pt_regs regs;
 120         unsigned long  task_size;
 121         unsigned long  map_base;
 122         unsigned long  flags;
 123 };
 124
 125 /* Thread struct flags. */
 126 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 127
 128 #define INIT_THREAD { \
 129         regs:   {       gr: { 0, }, \
 130                         fr: { 0, }, \
 131                         sr: { 0, }, \
 132                         iasq: { 0, }, \
 133                         iaoq: { 0, }, \
 134                         cr27: 0, \
 135                 }, \
 136         task_size:      DEFAULT_TASK_SIZE, \
 137         map_base:       DEFAULT_MAP_BASE, \
 138         flags:          0 \
 139         }
 140
 141 /*
 142  * Return saved PC of a blocked thread.  This is used by ps mostly.
 143  */
 144
 145 static inline unsigned long thread_saved_pc(struct thread_struct *t)
 146 {
 147         return 0xabcdef;
 148 }
 149
 150 /*
 151  * Start user thread in another space.
 152  *
 153  * Note that we set both the iaoq and r31 to the new pc. When
 154  * the kernel initially calls execve it will return through an
 155  * rfi path that will use the values in the iaoq. The execve
 156  * syscall path will return through the gateway page, and
 157  * that uses r31 to branch to.
 158  *
 159  * For ELF we clear r23, because the dynamic linker uses it to pass
 160  * the address of the finalizer function.
 161  *
 162  * We also initialize sr3 to an illegal value (illegal for our
 163  * implementation, not for the architecture).
 164  */
 165
 166 #define start_thread_som(regs, new_pc, new_sp) do {     \
 167         unsigned long *sp = (unsigned long *)new_sp;    \
 168         __u32 spaceid = (__u32)current->mm->context;    \
 169         unsigned long pc = (unsigned long)new_pc;       \
 170         /* offset pc for priv. level */                 \
 171         pc |= 3;                                        \
 172                                                         \
 173         set_fs(USER_DS);                                \
 174         regs->iasq[0] = spaceid;                        \
 175         regs->iasq[1] = spaceid;                        \
 176         regs->iaoq[0] = pc;                             \
 177         regs->iaoq[1] = pc + 4;                         \
 178         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 179         regs->sr[3] = 0xffff;                           \
 180         regs->sr[4] = spaceid;                          \
 181         regs->sr[5] = spaceid;                          \
 182         regs->sr[6] = spaceid;                          \
 183         regs->sr[7] = spaceid;                          \
 184         regs->gr[ 0] = USER_PSW;                        \
 185         regs->gr[30] = ((new_sp)+63)&~63;               \
 186         regs->gr[31] = pc;                              \
 187                                                         \
 188         get_user(regs->gr[26],&sp[0]);                  \
 189         get_user(regs->gr[25],&sp[-1]);                 \
 190         get_user(regs->gr[24],&sp[-2]);                 \
 191         get_user(regs->gr[23],&sp[-3]);                 \
 192 } while(0)
 193
 194 /* The ELF abi wants things done a "wee bit" differently than
 195  * som does.  Supporting this behavior here avoids
 196  * having our own version of create_elf_tables.
 197  *
 198  * Oh, and yes, that is not a typo, we are really passing argc in r25
 199  * and argv in r24 (rather than r26 and r25).  This is because that's
 200  * where __libc_start_main wants them.
 201  *
 202  * Duplicated from dl-machine.h for the benefit of readers:
 203  *
 204  *  Our initial stack layout is rather different from everyone else's
 205  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 206  *  this:
 207
 208    -----------------------------------  (user startup code creates this frame)
 209    |         32 bytes of magic       |
 210    |---------------------------------|
 211    | 32 bytes argument/sp save area  |
 212    |---------------------------------| (bprm->p)
 213    |        ELF auxiliary info       |
 214    |         (up to 28 words)        |
 215    |---------------------------------|
 216    |               NULL              |
 217    |---------------------------------|
 218    |       Environment pointers      |
 219    |---------------------------------|
 220    |               NULL              |
 221    |---------------------------------|
 222    |        Argument pointers        |
 223    |---------------------------------| <- argv
 224    |          argc (1 word)          |
 225    |---------------------------------| <- bprm->exec (HACK!)
 226    |         N bytes of slack        |
 227    |---------------------------------|
 228    |    filename passed to execve    |
 229    |---------------------------------| (mm->env_end)
 230    |           env strings           |
 231    |---------------------------------| (mm->env_start, mm->arg_end)
 232    |           arg strings           |
 233    |---------------------------------|
 234    | additional faked arg strings if |
 235    | we're invoked via binfmt_script |
 236    |---------------------------------| (mm->arg_start)
 237    stack base is at TASK_SIZE - rlim_max.
 238
 239 on downward growing arches, it looks like this:
 240    stack base at TASK_SIZE
 241    | filename passed to execve
 242    | env strings
 243    | arg strings
 244    | faked arg strings
 245    | slack
 246    | ELF
 247    | envps
 248    | argvs
 249    | argc
 250
 251  *  The pleasant part of this is that if we need to skip arguments we
 252  *  can just decrement argc and move argv, because the stack pointer
 253  *  is utterly unrelated to the location of the environment and
 254  *  argument vectors.
 255  *
 256  * Note that the S/390 people took the easy way out and hacked their
 257  * GCC to make the stack grow downwards.
 258  */
 259
 260 #define start_thread(regs, new_pc, new_sp) do {         \
 261         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 262         __u32 spaceid = (__u32)current->mm->context;    \
 263         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 264         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 265                                                         \
 266         set_fs(USER_DS);                                \
 267         regs->iasq[0] = spaceid;                        \
 268         regs->iasq[1] = spaceid;                        \
 269         regs->iaoq[0] = pc;                             \
 270         regs->iaoq[1] = pc + 4;                         \
 271         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 272         regs->sr[3] = 0xffff;                           \
 273         regs->sr[4] = spaceid;                          \
 274         regs->sr[5] = spaceid;                          \
 275         regs->sr[6] = spaceid;                          \
 276         regs->sr[7] = spaceid;                          \
 277         regs->gr[ 0] = USER_PSW;                        \
 278         regs->fr[ 0] = 0LL;                             \
 279         regs->fr[ 1] = 0LL;                             \
 280         regs->fr[ 2] = 0LL;                             \
 281         regs->fr[ 3] = 0LL;                             \
 282         regs->gr[30] = ((unsigned long)sp + 63) &~ 63;  \
 283         regs->gr[31] = pc;                              \
 284                                                         \
 285         get_user(regs->gr[25], (argv - 1));             \
 286         regs->gr[24] = (long) argv;                     \
 287         regs->gr[23] = 0;                               \
 288 } while(0)
 289
 290 struct task_struct;
 291 struct mm_struct;
 292
 293 /* Free all resources held by a thread. */
 294 extern void release_thread(struct task_struct *);
 295 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 296
 297 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 298
 299 #define copy_segments(tsk, mm)  do { \
 300                                         if (tsk->personality == PER_HPUX)  \
 301                                             map_hpux_gateway_page(tsk,mm); \
 302                                 } while (0)
 303 #define release_segments(mm)    do { } while (0)
 304
 305 static inline unsigned long get_wchan(struct task_struct *p)
 306 {
 307         return 0xdeadbeef; /* XXX */
 308 }
 309
 310 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 311 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 312
 313 #endif /* __ASSEMBLY__ */
 314
 315 #ifdef  CONFIG_PA20
 316 #define ARCH_HAS_PREFETCH
 317 extern inline void prefetch(const void *addr)
 318 {
 319         __asm__("ldw 0(%0), %%r0" : : "r" (addr));
 320 }
 321
 322 #define ARCH_HAS_PREFETCHW
 323 extern inline void prefetchw(const void *addr)
 324 {
 325         __asm__("ldd 0(%0), %%r0" : : "r" (addr));
 326 }
 327 #endif
 328
 329 /* Be sure to hunt all references to this down when you change the size of
 330  * the kernel stack */
 331
 332 #define THREAD_SIZE     (4*PAGE_SIZE)
 333
 334 #define alloc_task_struct() \
 335         ((struct task_struct *) __get_free_pages(GFP_KERNEL,2))
 336 #define free_task_struct(p)     free_pages((unsigned long)(p),2)
 337 #define get_task_struct(tsk)    atomic_inc(&virt_to_page(tsk)->count)
 338
 339 #define init_task (init_task_union.task)
 340 #define init_stack (init_task_union.stack)
 341
 342 #define cpu_relax()     do { } while (0)
 343
 344 #endif /* __ASM_PARISC_PROCESSOR_H */