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 TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  34#define TASK_SIZE               TASK_SIZE_OF(current)
  35#define TASK_UNMAPPED_BASE      (current->thread.map_base)
  36
  37#define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  38#define DEFAULT_MAP_BASE32      (0x40000000UL)
  39
  40#ifdef CONFIG_64BIT
  41#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  42#define DEFAULT_MAP_BASE        (0x200000000UL)
  43#else
  44#define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  45#define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  46#endif
  47
  48#ifdef __KERNEL__
  49
  50/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  51 * prumpf */
  52
  53#define STACK_TOP       TASK_SIZE
  54#define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  55
  56#endif
  57
  58#ifndef __ASSEMBLY__
  59
  60/*
  61 * Data detected about CPUs at boot time which is the same for all CPU's.
  62 * HP boxes are SMP - ie identical processors.
  63 *
  64 * FIXME: some CPU rev info may be processor specific...
  65 */
  66struct system_cpuinfo_parisc {
  67        unsigned int    cpu_count;
  68        unsigned int    cpu_hz;
  69        unsigned int    hversion;
  70        unsigned int    sversion;
  71        enum cpu_type   cpu_type;
  72
  73        struct {
  74                struct pdc_model model;
  75                unsigned long versions;
  76                unsigned long cpuid;
  77                unsigned long capabilities;
  78                char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  79        } pdc;
  80
  81        const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  82        const char      *family_name;   /* e.g. "1.1e" */
  83};
  84
  85
  86/* Per CPU data structure - ie varies per CPU.  */
  87struct cpuinfo_parisc {
  88        unsigned long it_value;     /* Interval Timer at last timer Intr */
  89        unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  90        unsigned long irq_count;    /* number of IRQ's since boot */
  91        unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  92        unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  93        unsigned long hpa;          /* Host Physical address */
  94        unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  95#ifdef CONFIG_SMP
  96        unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  97#endif
  98        unsigned long bh_count;     /* number of times bh was invoked */
  99        unsigned long prof_counter; /* per CPU profiling support */
 100        unsigned long prof_multiplier;  /* per CPU profiling support */
 101        unsigned long fp_rev;
 102        unsigned long fp_model;
 103        unsigned int state;
 104        struct parisc_device *dev;
 105        unsigned long loops_per_jiffy;
 106};
 107
 108extern struct system_cpuinfo_parisc boot_cpu_data;
 109DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 110
 111#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 112
 113typedef struct {
 114        int seg;  
 115} mm_segment_t;
 116
 117#define ARCH_MIN_TASKALIGN      8
 118
 119struct thread_struct {
 120        struct pt_regs regs;
 121        unsigned long  task_size;
 122        unsigned long  map_base;
 123        unsigned long  flags;
 124}; 
 125
 126#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 127
 128/* Thread struct flags. */
 129#define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 130#define PARISC_UAC_SIGBUS       (1UL << 1)
 131#define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 132
 133#define PARISC_UAC_SHIFT        0
 134#define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 135
 136#define SET_UNALIGN_CTL(task,value)                                       \
 137        ({                                                                \
 138        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 139                                | (((value) << PARISC_UAC_SHIFT) &        \
 140                                   PARISC_UAC_MASK));                     \
 141        0;                                                                \
 142        })
 143
 144#define GET_UNALIGN_CTL(task,addr)                                        \
 145        ({                                                                \
 146        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 147                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 148        })
 149
 150#define INIT_THREAD { \
 151        .regs = {       .gr     = { 0, }, \
 152                        .fr     = { 0, }, \
 153                        .sr     = { 0, }, \
 154                        .iasq   = { 0, }, \
 155                        .iaoq   = { 0, }, \
 156                        .cr27   = 0, \
 157                }, \
 158        .task_size      = DEFAULT_TASK_SIZE, \
 159        .map_base       = DEFAULT_MAP_BASE, \
 160        .flags          = 0 \
 161        }
 162
 163/*
 164 * Return saved PC of a blocked thread.  This is used by ps mostly.
 165 */
 166
 167struct task_struct;
 168unsigned long thread_saved_pc(struct task_struct *t);
 169void show_trace(struct task_struct *task, unsigned long *stack);
 170
 171/*
 172 * Start user thread in another space.
 173 *
 174 * Note that we set both the iaoq and r31 to the new pc. When
 175 * the kernel initially calls execve it will return through an
 176 * rfi path that will use the values in the iaoq. The execve
 177 * syscall path will return through the gateway page, and
 178 * that uses r31 to branch to.
 179 *
 180 * For ELF we clear r23, because the dynamic linker uses it to pass
 181 * the address of the finalizer function.
 182 *
 183 * We also initialize sr3 to an illegal value (illegal for our
 184 * implementation, not for the architecture).
 185 */
 186typedef unsigned int elf_caddr_t;
 187
 188#define start_thread_som(regs, new_pc, new_sp) do {     \
 189        unsigned long *sp = (unsigned long *)new_sp;    \
 190        __u32 spaceid = (__u32)current->mm->context;    \
 191        unsigned long pc = (unsigned long)new_pc;       \
 192        /* offset pc for priv. level */                 \
 193        pc |= 3;                                        \
 194                                                        \
 195        regs->iasq[0] = spaceid;                        \
 196        regs->iasq[1] = spaceid;                        \
 197        regs->iaoq[0] = pc;                             \
 198        regs->iaoq[1] = pc + 4;                         \
 199        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 200        regs->sr[3] = 0xffff;                           \
 201        regs->sr[4] = spaceid;                          \
 202        regs->sr[5] = spaceid;                          \
 203        regs->sr[6] = spaceid;                          \
 204        regs->sr[7] = spaceid;                          \
 205        regs->gr[ 0] = USER_PSW;                        \
 206        regs->gr[30] = ((new_sp)+63)&~63;               \
 207        regs->gr[31] = pc;                              \
 208                                                        \
 209        get_user(regs->gr[26],&sp[0]);                  \
 210        get_user(regs->gr[25],&sp[-1]);                 \
 211        get_user(regs->gr[24],&sp[-2]);                 \
 212        get_user(regs->gr[23],&sp[-3]);                 \
 213} while(0)
 214
 215/* The ELF abi wants things done a "wee bit" differently than
 216 * som does.  Supporting this behavior here avoids
 217 * having our own version of create_elf_tables.
 218 *
 219 * Oh, and yes, that is not a typo, we are really passing argc in r25
 220 * and argv in r24 (rather than r26 and r25).  This is because that's
 221 * where __libc_start_main wants them.
 222 *
 223 * Duplicated from dl-machine.h for the benefit of readers:
 224 *
 225 *  Our initial stack layout is rather different from everyone else's
 226 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 227 *  this:
 228
 229   -----------------------------------  (user startup code creates this frame)
 230   |         32 bytes of magic       |
 231   |---------------------------------|
 232   | 32 bytes argument/sp save area  |
 233   |---------------------------------| (bprm->p)
 234   |        ELF auxiliary info       |
 235   |         (up to 28 words)        |
 236   |---------------------------------|
 237   |               NULL              |
 238   |---------------------------------|
 239   |       Environment pointers      |
 240   |---------------------------------|
 241   |               NULL              |
 242   |---------------------------------|
 243   |        Argument pointers        |
 244   |---------------------------------| <- argv
 245   |          argc (1 word)          |
 246   |---------------------------------| <- bprm->exec (HACK!)
 247   |         N bytes of slack        |
 248   |---------------------------------|
 249   |    filename passed to execve    |
 250   |---------------------------------| (mm->env_end)
 251   |           env strings           |
 252   |---------------------------------| (mm->env_start, mm->arg_end)
 253   |           arg strings           |
 254   |---------------------------------|
 255   | additional faked arg strings if |
 256   | we're invoked via binfmt_script |
 257   |---------------------------------| (mm->arg_start)
 258   stack base is at TASK_SIZE - rlim_max.
 259
 260on downward growing arches, it looks like this:
 261   stack base at TASK_SIZE
 262   | filename passed to execve
 263   | env strings
 264   | arg strings
 265   | faked arg strings
 266   | slack
 267   | ELF
 268   | envps
 269   | argvs
 270   | argc
 271
 272 *  The pleasant part of this is that if we need to skip arguments we
 273 *  can just decrement argc and move argv, because the stack pointer
 274 *  is utterly unrelated to the location of the environment and
 275 *  argument vectors.
 276 *
 277 * Note that the S/390 people took the easy way out and hacked their
 278 * GCC to make the stack grow downwards.
 279 *
 280 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 281 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 282 * it in here from the current->personality
 283 */
 284
 285#ifdef CONFIG_64BIT
 286#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 287#else
 288#define USER_WIDE_MODE  0
 289#endif
 290
 291#define start_thread(regs, new_pc, new_sp) do {         \
 292        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 293        __u32 spaceid = (__u32)current->mm->context;    \
 294        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 295        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 296                                                        \
 297        regs->iasq[0] = spaceid;                        \
 298        regs->iasq[1] = spaceid;                        \
 299        regs->iaoq[0] = pc;                             \
 300        regs->iaoq[1] = pc + 4;                         \
 301        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 302        regs->sr[3] = 0xffff;                           \
 303        regs->sr[4] = spaceid;                          \
 304        regs->sr[5] = spaceid;                          \
 305        regs->sr[6] = spaceid;                          \
 306        regs->sr[7] = spaceid;                          \
 307        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 308        regs->fr[ 0] = 0LL;                             \
 309        regs->fr[ 1] = 0LL;                             \
 310        regs->fr[ 2] = 0LL;                             \
 311        regs->fr[ 3] = 0LL;                             \
 312        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 313        regs->gr[31] = pc;                              \
 314                                                        \
 315        get_user(regs->gr[25], (argv - 1));             \
 316        regs->gr[24] = (long) argv;                     \
 317        regs->gr[23] = 0;                               \
 318} while(0)
 319
 320struct task_struct;
 321struct mm_struct;
 322
 323/* Free all resources held by a thread. */
 324extern void release_thread(struct task_struct *);
 325
 326extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 327
 328extern 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 */
 338static inline int parisc_requires_coherency(void)
 339{
 340#ifdef CONFIG_PA8X00
 341        return (boot_cpu_data.cpu_type == mako) ||
 342                (boot_cpu_data.cpu_type == mako2);
 343#else
 344        return 0;
 345#endif
 346}
 347
 348#endif /* __ASSEMBLY__ */
 349
 350#endif /* __ASM_PARISC_PROCESSOR_H */
 351