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 #endif /* __ASSEMBLY__ */
  22
  23 #define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  24
  25 /*
  26  * Default implementation of macro that returns current
  27  * instruction pointer ("program counter").
  28  */
  29
  30 /* We cannot use MFIA as it was added for PA2.0 - prumpf
  31
  32    At one point there were no "0f/0b" type local symbols in gas for
  33    PA-RISC.  This is no longer true, but this still seems like the
  34    nicest way to implement this. */
  35
  36 #define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; })
  37
  38 #define TASK_SIZE               (current->thread.task_size)
  39 #define DEFAULT_TASK_SIZE       (0xFFF00000UL)
  40
  41 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  42 #define DEFAULT_MAP_BASE        (0x40000000UL)
  43
  44 #ifndef __ASSEMBLY__
  45
  46 /*
  47 ** Data detected about CPUs at boot time which is the same for all CPU's.
  48 ** HP boxes are SMP - ie identical processors.
  49 **
  50 ** FIXME: some CPU rev info may be processor specific...
  51 */
  52 struct system_cpuinfo_parisc {
  53         unsigned int    cpu_count;
  54         unsigned int    cpu_hz;
  55         unsigned int    hversion;
  56         unsigned int    sversion;
  57         enum cpu_type   cpu_type;
  58
  59         struct {
  60                 struct pdc_model model;
  61                 unsigned long versions;
  62                 unsigned long cpuid;
  63                 unsigned long capabilities;
  64                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  65         } pdc;
  66
  67         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  68         char            *family_name;   /* e.g. "1.1e" */
  69 };
  70
  71
  72 /*
  73 ** Per CPU data structure - ie varies per CPU.
  74 */
  75 struct cpuinfo_parisc {
  76         unsigned long it_value;     /* Interval Timer at last timer Intr */
  77         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  78         unsigned long irq_count;    /* number of IRQ's since boot */
  79         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  80         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  81         unsigned long hpa;          /* Host Physical address */
  82         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  83 #ifdef CONFIG_SMP
  84         spinlock_t lock;            /* synchronization for ipi's */
  85         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  86         unsigned long ipi_count;    /* number ipi Interrupts */
  87 #endif
  88         unsigned long bh_count;     /* number of times bh was invoked */
  89         unsigned long prof_counter; /* per CPU profiling support */
  90         unsigned long prof_multiplier;  /* per CPU profiling support */
  91         unsigned long fp_rev;
  92         unsigned long fp_model;
  93         unsigned int state;
  94         struct parisc_device *dev;
  95         unsigned long loops_per_jiffy;
  96 };
  97
  98 extern struct system_cpuinfo_parisc boot_cpu_data;
  99 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 100 #define current_cpu_data cpu_data[smp_processor_id()]
 101
 102 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 103
 104 #ifdef CONFIG_EISA
 105 extern int EISA_bus;
 106 #else
 107 #define EISA_bus 0
 108 #endif
 109
 110 #define MCA_bus 0
 111 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
 112
 113 typedef struct {
 114         int seg;
 115 } mm_segment_t;
 116
 117 struct thread_struct {
 118         struct pt_regs regs;
 119         unsigned long  task_size;
 120         unsigned long  map_base;
 121         unsigned long  flags;
 122 };
 123
 124 /* Thread struct flags. */
 125 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 126
 127 #define INIT_THREAD { \
 128         regs:   {       gr: { 0, }, \
 129                         fr: { 0, }, \
 130                         sr: { 0, }, \
 131                         iasq: { 0, }, \
 132                         iaoq: { 0, }, \
 133                         cr27: 0, \
 134                 }, \
 135         task_size:      DEFAULT_TASK_SIZE, \
 136         map_base:       DEFAULT_MAP_BASE, \
 137         flags:          0 \
 138         }
 139
 140 /*
 141  * Return saved PC of a blocked thread.  This is used by ps mostly.
 142  */
 143
 144 unsigned long thread_saved_pc(struct task_struct *t);
 145 void show_trace(struct task_struct *task, unsigned long *stack);
 146
 147 /*
 148  * Start user thread in another space.
 149  *
 150  * Note that we set both the iaoq and r31 to the new pc. When
 151  * the kernel initially calls execve it will return through an
 152  * rfi path that will use the values in the iaoq. The execve
 153  * syscall path will return through the gateway page, and
 154  * that uses r31 to branch to.
 155  *
 156  * For ELF we clear r23, because the dynamic linker uses it to pass
 157  * the address of the finalizer function.
 158  *
 159  * We also initialize sr3 to an illegal value (illegal for our
 160  * implementation, not for the architecture).
 161  */
 162 typedef unsigned int elf_caddr_t;
 163
 164 #define start_thread_som(regs, new_pc, new_sp) do {     \
 165         unsigned long *sp = (unsigned long *)new_sp;    \
 166         __u32 spaceid = (__u32)current->mm->context;    \
 167         unsigned long pc = (unsigned long)new_pc;       \
 168         /* offset pc for priv. level */                 \
 169         pc |= 3;                                        \
 170                                                         \
 171         set_fs(USER_DS);                                \
 172         regs->iasq[0] = spaceid;                        \
 173         regs->iasq[1] = spaceid;                        \
 174         regs->iaoq[0] = pc;                             \
 175         regs->iaoq[1] = pc + 4;                         \
 176         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 177         regs->sr[3] = 0xffff;                           \
 178         regs->sr[4] = spaceid;                          \
 179         regs->sr[5] = spaceid;                          \
 180         regs->sr[6] = spaceid;                          \
 181         regs->sr[7] = spaceid;                          \
 182         regs->gr[ 0] = USER_PSW;                        \
 183         regs->gr[30] = ((new_sp)+63)&~63;               \
 184         regs->gr[31] = pc;                              \
 185                                                         \
 186         get_user(regs->gr[26],&sp[0]);                  \
 187         get_user(regs->gr[25],&sp[-1]);                 \
 188         get_user(regs->gr[24],&sp[-2]);                 \
 189         get_user(regs->gr[23],&sp[-3]);                 \
 190 } while(0)
 191
 192 /* The ELF abi wants things done a "wee bit" differently than
 193  * som does.  Supporting this behavior here avoids
 194  * having our own version of create_elf_tables.
 195  *
 196  * Oh, and yes, that is not a typo, we are really passing argc in r25
 197  * and argv in r24 (rather than r26 and r25).  This is because that's
 198  * where __libc_start_main wants them.
 199  *
 200  * Duplicated from dl-machine.h for the benefit of readers:
 201  *
 202  *  Our initial stack layout is rather different from everyone else's
 203  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 204  *  this:
 205
 206    -----------------------------------  (user startup code creates this frame)
 207    |         32 bytes of magic       |
 208    |---------------------------------|
 209    | 32 bytes argument/sp save area  |
 210    |---------------------------------| (bprm->p)
 211    |        ELF auxiliary info       |
 212    |         (up to 28 words)        |
 213    |---------------------------------|
 214    |               NULL              |
 215    |---------------------------------|
 216    |       Environment pointers      |
 217    |---------------------------------|
 218    |               NULL              |
 219    |---------------------------------|
 220    |        Argument pointers        |
 221    |---------------------------------| <- argv
 222    |          argc (1 word)          |
 223    |---------------------------------| <- bprm->exec (HACK!)
 224    |         N bytes of slack        |
 225    |---------------------------------|
 226    |    filename passed to execve    |
 227    |---------------------------------| (mm->env_end)
 228    |           env strings           |
 229    |---------------------------------| (mm->env_start, mm->arg_end)
 230    |           arg strings           |
 231    |---------------------------------|
 232    | additional faked arg strings if |
 233    | we're invoked via binfmt_script |
 234    |---------------------------------| (mm->arg_start)
 235    stack base is at TASK_SIZE - rlim_max.
 236
 237 on downward growing arches, it looks like this:
 238    stack base at TASK_SIZE
 239    | filename passed to execve
 240    | env strings
 241    | arg strings
 242    | faked arg strings
 243    | slack
 244    | ELF
 245    | envps
 246    | argvs
 247    | argc
 248
 249  *  The pleasant part of this is that if we need to skip arguments we
 250  *  can just decrement argc and move argv, because the stack pointer
 251  *  is utterly unrelated to the location of the environment and
 252  *  argument vectors.
 253  *
 254  * Note that the S/390 people took the easy way out and hacked their
 255  * GCC to make the stack grow downwards.
 256  */
 257
 258 #define start_thread(regs, new_pc, new_sp) do {         \
 259         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 260         __u32 spaceid = (__u32)current->mm->context;    \
 261         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 262         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 263                                                         \
 264         set_fs(USER_DS);                                \
 265         regs->iasq[0] = spaceid;                        \
 266         regs->iasq[1] = spaceid;                        \
 267         regs->iaoq[0] = pc;                             \
 268         regs->iaoq[1] = pc + 4;                         \
 269         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 270         regs->sr[3] = 0xffff;                           \
 271         regs->sr[4] = spaceid;                          \
 272         regs->sr[5] = spaceid;                          \
 273         regs->sr[6] = spaceid;                          \
 274         regs->sr[7] = spaceid;                          \
 275         regs->gr[ 0] = USER_PSW;                        \
 276         regs->fr[ 0] = 0LL;                             \
 277         regs->fr[ 1] = 0LL;                             \
 278         regs->fr[ 2] = 0LL;                             \
 279         regs->fr[ 3] = 0LL;                             \
 280         regs->gr[30] = ((unsigned long)sp + 63) &~ 63;  \
 281         regs->gr[31] = pc;                              \
 282                                                         \
 283         get_user(regs->gr[25], (argv - 1));             \
 284         regs->gr[24] = (long) argv;                     \
 285         regs->gr[23] = 0;                               \
 286 } while(0)
 287
 288 struct task_struct;
 289 struct mm_struct;
 290
 291 /* Free all resources held by a thread. */
 292 extern void release_thread(struct task_struct *);
 293 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 294
 295 /* Prepare to copy thread state - unlazy all lazy status */
 296 #define prepare_to_copy(tsk)    do { } while (0)
 297
 298 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 299
 300 static inline unsigned long get_wchan(struct task_struct *p)
 301 {
 302         return 0xdeadbeef; /* XXX */
 303 }
 304
 305 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 306 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 307
 308 #endif /* __ASSEMBLY__ */
 309
 310 #ifdef  CONFIG_PA20
 311 #define ARCH_HAS_PREFETCH
 312 extern inline void prefetch(const void *addr)
 313 {
 314         __asm__("ldw 0(%0), %%r0" : : "r" (addr));
 315 }
 316
 317 #define ARCH_HAS_PREFETCHW
 318 extern inline void prefetchw(const void *addr)
 319 {
 320         __asm__("ldd 0(%0), %%r0" : : "r" (addr));
 321 }
 322 #endif
 323
 324 #define cpu_relax()     barrier()
 325
 326 #endif /* __ASM_PARISC_PROCESSOR_H */