LXR linux/arch/parisc/include/asm/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/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/percpu.h>
  20#endif /* __ASSEMBLY__ */
  21
  22/*
  23 * Default implementation of macro that returns current
  24 * instruction pointer ("program counter").
  25 */
  26#ifdef CONFIG_PA20
  27#define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  28#else /* mfia added in pa2.0 */
  29#define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  30#endif
  31#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  32
  33#define HAVE_ARCH_PICK_MMAP_LAYOUT
  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/* Allow bigger stacks for 64-bit processes */
  59#define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
  60                         ? (1 << 30)    /* 1 GB */                      \
  61                         : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
  62
  63#endif
  64
  65#ifndef __ASSEMBLY__
  66
  67/*
  68 * Data detected about CPUs at boot time which is the same for all CPU's.
  69 * HP boxes are SMP - ie identical processors.
  70 *
  71 * FIXME: some CPU rev info may be processor specific...
  72 */
  73struct system_cpuinfo_parisc {
  74        unsigned int    cpu_count;
  75        unsigned int    cpu_hz;
  76        unsigned int    hversion;
  77        unsigned int    sversion;
  78        enum cpu_type   cpu_type;
  79
  80        struct {
  81                struct pdc_model model;
  82                unsigned long versions;
  83                unsigned long cpuid;
  84                unsigned long capabilities;
  85                char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  86        } pdc;
  87
  88        const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  89        const char      *family_name;   /* e.g. "1.1e" */
  90};
  91
  92
  93/* Per CPU data structure - ie varies per CPU.  */
  94struct cpuinfo_parisc {
  95        unsigned long it_value;     /* Interval Timer at last timer Intr */
  96        unsigned long irq_count;    /* number of IRQ's since boot */
  97        unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  98        unsigned long hpa;          /* Host Physical address */
  99        unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 100#ifdef CONFIG_SMP
 101        unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 102#endif
 103        unsigned long bh_count;     /* number of times bh was invoked */
 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
 111extern struct system_cpuinfo_parisc boot_cpu_data;
 112DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 113
 114#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 115
 116typedef struct {
 117        int seg;  
 118} mm_segment_t;
 119
 120#define ARCH_MIN_TASKALIGN      8
 121
 122struct thread_struct {
 123        struct pt_regs regs;
 124        unsigned long  task_size;
 125        unsigned long  map_base;
 126        unsigned long  flags;
 127}; 
 128
 129#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 130
 131/* Thread struct flags. */
 132#define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 133#define PARISC_UAC_SIGBUS       (1UL << 1)
 134#define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 135
 136#define PARISC_UAC_SHIFT        0
 137#define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 138
 139#define SET_UNALIGN_CTL(task,value)                                       \
 140        ({                                                                \
 141        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 142                                | (((value) << PARISC_UAC_SHIFT) &        \
 143                                   PARISC_UAC_MASK));                     \
 144        0;                                                                \
 145        })
 146
 147#define GET_UNALIGN_CTL(task,addr)                                        \
 148        ({                                                                \
 149        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 150                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 151        })
 152
 153#define INIT_THREAD { \
 154        .regs = {       .gr     = { 0, }, \
 155                        .fr     = { 0, }, \
 156                        .sr     = { 0, }, \
 157                        .iasq   = { 0, }, \
 158                        .iaoq   = { 0, }, \
 159                        .cr27   = 0, \
 160                }, \
 161        .task_size      = DEFAULT_TASK_SIZE, \
 162        .map_base       = DEFAULT_MAP_BASE, \
 163        .flags          = 0 \
 164        }
 165
 166/*
 167 * Return saved PC of a blocked thread.  This is used by ps mostly.
 168 */
 169
 170struct task_struct;
 171unsigned long thread_saved_pc(struct task_struct *t);
 172void show_trace(struct task_struct *task, unsigned long *stack);
 173
 174/*
 175 * Start user thread in another space.
 176 *
 177 * Note that we set both the iaoq and r31 to the new pc. When
 178 * the kernel initially calls execve it will return through an
 179 * rfi path that will use the values in the iaoq. The execve
 180 * syscall path will return through the gateway page, and
 181 * that uses r31 to branch to.
 182 *
 183 * For ELF we clear r23, because the dynamic linker uses it to pass
 184 * the address of the finalizer function.
 185 *
 186 * We also initialize sr3 to an illegal value (illegal for our
 187 * implementation, not for the architecture).
 188 */
 189typedef unsigned int elf_caddr_t;
 190
 191/* The ELF abi wants things done a "wee bit" differently than
 192 * som does.  Supporting this behavior here avoids
 193 * having our own version of create_elf_tables.
 194 *
 195 * Oh, and yes, that is not a typo, we are really passing argc in r25
 196 * and argv in r24 (rather than r26 and r25).  This is because that's
 197 * where __libc_start_main wants them.
 198 *
 199 * Duplicated from dl-machine.h for the benefit of readers:
 200 *
 201 *  Our initial stack layout is rather different from everyone else's
 202 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 203 *  this:
 204
 205   -----------------------------------  (user startup code creates this frame)
 206   |         32 bytes of magic       |
 207   |---------------------------------|
 208   | 32 bytes argument/sp save area  |
 209   |---------------------------------| (bprm->p)
 210   |        ELF auxiliary info       |
 211   |         (up to 28 words)        |
 212   |---------------------------------|
 213   |               NULL              |
 214   |---------------------------------|
 215   |       Environment pointers      |
 216   |---------------------------------|
 217   |               NULL              |
 218   |---------------------------------|
 219   |        Argument pointers        |
 220   |---------------------------------| <- argv
 221   |          argc (1 word)          |
 222   |---------------------------------| <- bprm->exec (HACK!)
 223   |         N bytes of slack        |
 224   |---------------------------------|
 225   |    filename passed to execve    |
 226   |---------------------------------| (mm->env_end)
 227   |           env strings           |
 228   |---------------------------------| (mm->env_start, mm->arg_end)
 229   |           arg strings           |
 230   |---------------------------------|
 231   | additional faked arg strings if |
 232   | we're invoked via binfmt_script |
 233   |---------------------------------| (mm->arg_start)
 234   stack base is at TASK_SIZE - rlim_max.
 235
 236on downward growing arches, it looks like this:
 237   stack base at TASK_SIZE
 238   | filename passed to execve
 239   | env strings
 240   | arg strings
 241   | faked arg strings
 242   | slack
 243   | ELF
 244   | envps
 245   | argvs
 246   | argc
 247
 248 *  The pleasant part of this is that if we need to skip arguments we
 249 *  can just decrement argc and move argv, because the stack pointer
 250 *  is utterly unrelated to the location of the environment and
 251 *  argument vectors.
 252 *
 253 * Note that the S/390 people took the easy way out and hacked their
 254 * GCC to make the stack grow downwards.
 255 *
 256 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 257 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 258 * it in here from the current->personality
 259 */
 260
 261#ifdef CONFIG_64BIT
 262#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 263#else
 264#define USER_WIDE_MODE  0
 265#endif
 266
 267#define start_thread(regs, new_pc, new_sp) do {         \
 268        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 269        __u32 spaceid = (__u32)current->mm->context;    \
 270        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 271        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 272                                                        \
 273        regs->iasq[0] = spaceid;                        \
 274        regs->iasq[1] = spaceid;                        \
 275        regs->iaoq[0] = pc;                             \
 276        regs->iaoq[1] = pc + 4;                         \
 277        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 278        regs->sr[3] = 0xffff;                           \
 279        regs->sr[4] = spaceid;                          \
 280        regs->sr[5] = spaceid;                          \
 281        regs->sr[6] = spaceid;                          \
 282        regs->sr[7] = spaceid;                          \
 283        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 284        regs->fr[ 0] = 0LL;                             \
 285        regs->fr[ 1] = 0LL;                             \
 286        regs->fr[ 2] = 0LL;                             \
 287        regs->fr[ 3] = 0LL;                             \
 288        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 289        regs->gr[31] = pc;                              \
 290                                                        \
 291        get_user(regs->gr[25], (argv - 1));             \
 292        regs->gr[24] = (long) argv;                     \
 293        regs->gr[23] = 0;                               \
 294} while(0)
 295
 296struct task_struct;
 297struct mm_struct;
 298
 299/* Free all resources held by a thread. */
 300extern void release_thread(struct task_struct *);
 301
 302extern unsigned long get_wchan(struct task_struct *p);
 303
 304#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 305#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 306
 307#define cpu_relax()     barrier()
 308
 309/*
 310 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 311 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 312 * with different data, whether clean or not) to operate
 313 */
 314#ifdef CONFIG_PA8X00
 315extern int _parisc_requires_coherency;
 316#define parisc_requires_coherency()     _parisc_requires_coherency
 317#else
 318#define parisc_requires_coherency()     (0)
 319#endif
 320
 321#endif /* __ASSEMBLY__ */
 322
 323#endif /* __ASM_PARISC_PROCESSOR_H */
 324