LXR linux/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/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/system.h>
  20#endif /* __ASSEMBLY__ */
  21
  22#define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
  23
  24/*
  25 * Default implementation of macro that returns current
  26 * instruction pointer ("program counter").
  27 */
  28#ifdef CONFIG_PA20
  29#define current_ia(x)   __asm__("mfia %0" : "=r"(x))
  30#else /* mfia added in pa2.0 */
  31#define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
  32#endif
  33#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
  34
  35#define TASK_SIZE               (current->thread.task_size)
  36#define TASK_UNMAPPED_BASE      (current->thread.map_base)
  37
  38#define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  39#define DEFAULT_MAP_BASE32      (0x40000000UL)
  40
  41#ifdef CONFIG_64BIT
  42#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  43#define DEFAULT_MAP_BASE        (0x200000000UL)
  44#else
  45#define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  46#define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  47#endif
  48
  49#ifndef __ASSEMBLY__
  50
  51/*
  52 * Data detected about CPUs at boot time which is the same for all CPU's.
  53 * HP boxes are SMP - ie identical processors.
  54 *
  55 * FIXME: some CPU rev info may be processor specific...
  56 */
  57struct system_cpuinfo_parisc {
  58        unsigned int    cpu_count;
  59        unsigned int    cpu_hz;
  60        unsigned int    hversion;
  61        unsigned int    sversion;
  62        enum cpu_type   cpu_type;
  63
  64        struct {
  65                struct pdc_model model;
  66                unsigned long versions;
  67                unsigned long cpuid;
  68                unsigned long capabilities;
  69                char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  70        } pdc;
  71
  72        const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  73        const char      *family_name;   /* e.g. "1.1e" */
  74};
  75
  76
  77/* Per CPU data structure - ie varies per CPU.  */
  78struct cpuinfo_parisc {
  79        unsigned long it_value;     /* Interval Timer at last timer Intr */
  80        unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
  81        unsigned long irq_count;    /* number of IRQ's since boot */
  82        unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
  83        unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  84        unsigned long hpa;          /* Host Physical address */
  85        unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  86#ifdef CONFIG_SMP
  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        unsigned long loops_per_jiffy;
  98};
  99
 100extern struct system_cpuinfo_parisc boot_cpu_data;
 101extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 102#define current_cpu_data cpu_data[smp_processor_id()]
 103
 104#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 105
 106typedef struct {
 107        int seg;  
 108} mm_segment_t;
 109
 110#define ARCH_MIN_TASKALIGN      8
 111
 112struct thread_struct {
 113        struct pt_regs regs;
 114        unsigned long  task_size;
 115        unsigned long  map_base;
 116        unsigned long  flags;
 117}; 
 118
 119/* Thread struct flags. */
 120#define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 121#define PARISC_UAC_SIGBUS       (1UL << 1)
 122#define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 123
 124#define PARISC_UAC_SHIFT        0
 125#define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 126
 127#define SET_UNALIGN_CTL(task,value)                                       \
 128        ({                                                                \
 129        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 130                                | (((value) << PARISC_UAC_SHIFT) &        \
 131                                   PARISC_UAC_MASK));                     \
 132        0;                                                                \
 133        })
 134
 135#define GET_UNALIGN_CTL(task,addr)                                        \
 136        ({                                                                \
 137        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 138                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 139        })
 140
 141#define INIT_THREAD { \
 142        .regs = {       .gr     = { 0, }, \
 143                        .fr     = { 0, }, \
 144                        .sr     = { 0, }, \
 145                        .iasq   = { 0, }, \
 146                        .iaoq   = { 0, }, \
 147                        .cr27   = 0, \
 148                }, \
 149        .task_size      = DEFAULT_TASK_SIZE, \
 150        .map_base       = DEFAULT_MAP_BASE, \
 151        .flags          = 0 \
 152        }
 153
 154/*
 155 * Return saved PC of a blocked thread.  This is used by ps mostly.
 156 */
 157
 158unsigned long thread_saved_pc(struct task_struct *t);
 159void show_trace(struct task_struct *task, unsigned long *stack);
 160
 161/*
 162 * Start user thread in another space.
 163 *
 164 * Note that we set both the iaoq and r31 to the new pc. When
 165 * the kernel initially calls execve it will return through an
 166 * rfi path that will use the values in the iaoq. The execve
 167 * syscall path will return through the gateway page, and
 168 * that uses r31 to branch to.
 169 *
 170 * For ELF we clear r23, because the dynamic linker uses it to pass
 171 * the address of the finalizer function.
 172 *
 173 * We also initialize sr3 to an illegal value (illegal for our
 174 * implementation, not for the architecture).
 175 */
 176typedef unsigned int elf_caddr_t;
 177
 178#define start_thread_som(regs, new_pc, new_sp) do {     \
 179        unsigned long *sp = (unsigned long *)new_sp;    \
 180        __u32 spaceid = (__u32)current->mm->context;    \
 181        unsigned long pc = (unsigned long)new_pc;       \
 182        /* offset pc for priv. level */                 \
 183        pc |= 3;                                        \
 184                                                        \
 185        set_fs(USER_DS);                                \
 186        regs->iasq[0] = spaceid;                        \
 187        regs->iasq[1] = spaceid;                        \
 188        regs->iaoq[0] = pc;                             \
 189        regs->iaoq[1] = pc + 4;                         \
 190        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 191        regs->sr[3] = 0xffff;                           \
 192        regs->sr[4] = spaceid;                          \
 193        regs->sr[5] = spaceid;                          \
 194        regs->sr[6] = spaceid;                          \
 195        regs->sr[7] = spaceid;                          \
 196        regs->gr[ 0] = USER_PSW;                        \
 197        regs->gr[30] = ((new_sp)+63)&~63;               \
 198        regs->gr[31] = pc;                              \
 199                                                        \
 200        get_user(regs->gr[26],&sp[0]);                  \
 201        get_user(regs->gr[25],&sp[-1]);                 \
 202        get_user(regs->gr[24],&sp[-2]);                 \
 203        get_user(regs->gr[23],&sp[-3]);                 \
 204} while(0)
 205
 206/* The ELF abi wants things done a "wee bit" differently than
 207 * som does.  Supporting this behavior here avoids
 208 * having our own version of create_elf_tables.
 209 *
 210 * Oh, and yes, that is not a typo, we are really passing argc in r25
 211 * and argv in r24 (rather than r26 and r25).  This is because that's
 212 * where __libc_start_main wants them.
 213 *
 214 * Duplicated from dl-machine.h for the benefit of readers:
 215 *
 216 *  Our initial stack layout is rather different from everyone else's
 217 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 218 *  this:
 219
 220   -----------------------------------  (user startup code creates this frame)
 221   |         32 bytes of magic       |
 222   |---------------------------------|
 223   | 32 bytes argument/sp save area  |
 224   |---------------------------------| (bprm->p)
 225   |        ELF auxiliary info       |
 226   |         (up to 28 words)        |
 227   |---------------------------------|
 228   |               NULL              |
 229   |---------------------------------|
 230   |       Environment pointers      |
 231   |---------------------------------|
 232   |               NULL              |
 233   |---------------------------------|
 234   |        Argument pointers        |
 235   |---------------------------------| <- argv
 236   |          argc (1 word)          |
 237   |---------------------------------| <- bprm->exec (HACK!)
 238   |         N bytes of slack        |
 239   |---------------------------------|
 240   |    filename passed to execve    |
 241   |---------------------------------| (mm->env_end)
 242   |           env strings           |
 243   |---------------------------------| (mm->env_start, mm->arg_end)
 244   |           arg strings           |
 245   |---------------------------------|
 246   | additional faked arg strings if |
 247   | we're invoked via binfmt_script |
 248   |---------------------------------| (mm->arg_start)
 249   stack base is at TASK_SIZE - rlim_max.
 250
 251on downward growing arches, it looks like this:
 252   stack base at TASK_SIZE
 253   | filename passed to execve
 254   | env strings
 255   | arg strings
 256   | faked arg strings
 257   | slack
 258   | ELF
 259   | envps
 260   | argvs
 261   | argc
 262
 263 *  The pleasant part of this is that if we need to skip arguments we
 264 *  can just decrement argc and move argv, because the stack pointer
 265 *  is utterly unrelated to the location of the environment and
 266 *  argument vectors.
 267 *
 268 * Note that the S/390 people took the easy way out and hacked their
 269 * GCC to make the stack grow downwards.
 270 *
 271 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 272 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 273 * it in here from the current->personality
 274 */
 275
 276#ifdef CONFIG_64BIT
 277#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 278#else
 279#define USER_WIDE_MODE  0
 280#endif
 281
 282#define start_thread(regs, new_pc, new_sp) do {         \
 283        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 284        __u32 spaceid = (__u32)current->mm->context;    \
 285        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 286        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 287                                                        \
 288        set_fs(USER_DS);                                \
 289        regs->iasq[0] = spaceid;                        \
 290        regs->iasq[1] = spaceid;                        \
 291        regs->iaoq[0] = pc;                             \
 292        regs->iaoq[1] = pc + 4;                         \
 293        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 294        regs->sr[3] = 0xffff;                           \
 295        regs->sr[4] = spaceid;                          \
 296        regs->sr[5] = spaceid;                          \
 297        regs->sr[6] = spaceid;                          \
 298        regs->sr[7] = spaceid;                          \
 299        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 300        regs->fr[ 0] = 0LL;                             \
 301        regs->fr[ 1] = 0LL;                             \
 302        regs->fr[ 2] = 0LL;                             \
 303        regs->fr[ 3] = 0LL;                             \
 304        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 305        regs->gr[31] = pc;                              \
 306                                                        \
 307        get_user(regs->gr[25], (argv - 1));             \
 308        regs->gr[24] = (long) argv;                     \
 309        regs->gr[23] = 0;                               \
 310} while(0)
 311
 312struct task_struct;
 313struct mm_struct;
 314
 315/* Free all resources held by a thread. */
 316extern void release_thread(struct task_struct *);
 317extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 318
 319/* Prepare to copy thread state - unlazy all lazy status */
 320#define prepare_to_copy(tsk)    do { } while (0)
 321
 322extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 323
 324extern unsigned long get_wchan(struct task_struct *p);
 325
 326#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 327#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 328
 329#define cpu_relax()     barrier()
 330
 331/* Used as a macro to identify the combined VIPT/PIPT cached
 332 * CPUs which require a guarantee of coherency (no inequivalent
 333 * aliases with different data, whether clean or not) to operate */
 334static inline int parisc_requires_coherency(void)
 335{
 336#ifdef CONFIG_PA8X00
 337        return (boot_cpu_data.cpu_type == mako) ||
 338                (boot_cpu_data.cpu_type == mako2);
 339#else
 340        return 0;
 341#endif
 342}
 343
 344#endif /* __ASSEMBLY__ */
 345
 346#endif /* __ASM_PARISC_PROCESSOR_H */
 347