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  */
  73 struct 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.  */
  94 struct 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 long cpu_num;      /* CPU number from PAT firmware */
 107         unsigned long cpu_loc;      /* CPU location from PAT firmware */
 108         unsigned int state;
 109         struct parisc_device *dev;
 110         unsigned long loops_per_jiffy;
 111 };
 112
 113 extern struct system_cpuinfo_parisc boot_cpu_data;
 114 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 115
 116 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 117
 118 typedef struct {
 119         int seg;
 120 } mm_segment_t;
 121
 122 #define ARCH_MIN_TASKALIGN      8
 123
 124 struct thread_struct {
 125         struct pt_regs regs;
 126         unsigned long  task_size;
 127         unsigned long  map_base;
 128         unsigned long  flags;
 129 };
 130
 131 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 132
 133 /* Thread struct flags. */
 134 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 135 #define PARISC_UAC_SIGBUS       (1UL << 1)
 136 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 137
 138 #define PARISC_UAC_SHIFT        0
 139 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 140
 141 #define SET_UNALIGN_CTL(task,value)                                       \
 142         ({                                                                \
 143         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 144                                 | (((value) << PARISC_UAC_SHIFT) &        \
 145                                    PARISC_UAC_MASK));                     \
 146         0;                                                                \
 147         })
 148
 149 #define GET_UNALIGN_CTL(task,addr)                                        \
 150         ({                                                                \
 151         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 152                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 153         })
 154
 155 #define INIT_THREAD { \
 156         .regs = {       .gr     = { 0, }, \
 157                         .fr     = { 0, }, \
 158                         .sr     = { 0, }, \
 159                         .iasq   = { 0, }, \
 160                         .iaoq   = { 0, }, \
 161                         .cr27   = 0, \
 162                 }, \
 163         .task_size      = DEFAULT_TASK_SIZE, \
 164         .map_base       = DEFAULT_MAP_BASE, \
 165         .flags          = 0 \
 166         }
 167
 168 struct task_struct;
 169 void 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  */
 186 typedef unsigned int elf_caddr_t;
 187
 188 /* The ELF abi wants things done a "wee bit" differently than
 189  * som does.  Supporting this behavior here avoids
 190  * having our own version of create_elf_tables.
 191  *
 192  * Oh, and yes, that is not a typo, we are really passing argc in r25
 193  * and argv in r24 (rather than r26 and r25).  This is because that's
 194  * where __libc_start_main wants them.
 195  *
 196  * Duplicated from dl-machine.h for the benefit of readers:
 197  *
 198  *  Our initial stack layout is rather different from everyone else's
 199  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 200  *  this:
 201
 202    -----------------------------------  (user startup code creates this frame)
 203    |         32 bytes of magic       |
 204    |---------------------------------|
 205    | 32 bytes argument/sp save area  |
 206    |---------------------------------| (bprm->p)
 207    |        ELF auxiliary info       |
 208    |         (up to 28 words)        |
 209    |---------------------------------|
 210    |               NULL              |
 211    |---------------------------------|
 212    |       Environment pointers      |
 213    |---------------------------------|
 214    |               NULL              |
 215    |---------------------------------|
 216    |        Argument pointers        |
 217    |---------------------------------| <- argv
 218    |          argc (1 word)          |
 219    |---------------------------------| <- bprm->exec (HACK!)
 220    |         N bytes of slack        |
 221    |---------------------------------|
 222    |    filename passed to execve    |
 223    |---------------------------------| (mm->env_end)
 224    |           env strings           |
 225    |---------------------------------| (mm->env_start, mm->arg_end)
 226    |           arg strings           |
 227    |---------------------------------|
 228    | additional faked arg strings if |
 229    | we're invoked via binfmt_script |
 230    |---------------------------------| (mm->arg_start)
 231    stack base is at TASK_SIZE - rlim_max.
 232
 233 on downward growing arches, it looks like this:
 234    stack base at TASK_SIZE
 235    | filename passed to execve
 236    | env strings
 237    | arg strings
 238    | faked arg strings
 239    | slack
 240    | ELF
 241    | envps
 242    | argvs
 243    | argc
 244
 245  *  The pleasant part of this is that if we need to skip arguments we
 246  *  can just decrement argc and move argv, because the stack pointer
 247  *  is utterly unrelated to the location of the environment and
 248  *  argument vectors.
 249  *
 250  * Note that the S/390 people took the easy way out and hacked their
 251  * GCC to make the stack grow downwards.
 252  *
 253  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 254  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 255  * it in here from the current->personality
 256  */
 257
 258 #ifdef CONFIG_64BIT
 259 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 260 #else
 261 #define USER_WIDE_MODE  0
 262 #endif
 263
 264 #define start_thread(regs, new_pc, new_sp) do {         \
 265         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 266         __u32 spaceid = (__u32)current->mm->context;    \
 267         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 268         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 269                                                         \
 270         regs->iasq[0] = spaceid;                        \
 271         regs->iasq[1] = spaceid;                        \
 272         regs->iaoq[0] = pc;                             \
 273         regs->iaoq[1] = pc + 4;                         \
 274         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 275         regs->sr[3] = 0xffff;                           \
 276         regs->sr[4] = spaceid;                          \
 277         regs->sr[5] = spaceid;                          \
 278         regs->sr[6] = spaceid;                          \
 279         regs->sr[7] = spaceid;                          \
 280         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 281         regs->fr[ 0] = 0LL;                             \
 282         regs->fr[ 1] = 0LL;                             \
 283         regs->fr[ 2] = 0LL;                             \
 284         regs->fr[ 3] = 0LL;                             \
 285         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 286         regs->gr[31] = pc;                              \
 287                                                         \
 288         get_user(regs->gr[25], (argv - 1));             \
 289         regs->gr[24] = (long) argv;                     \
 290         regs->gr[23] = 0;                               \
 291 } while(0)
 292
 293 struct task_struct;
 294 struct mm_struct;
 295
 296 /* Free all resources held by a thread. */
 297 extern void release_thread(struct task_struct *);
 298
 299 extern unsigned long get_wchan(struct task_struct *p);
 300
 301 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 302 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 303
 304 #define cpu_relax()     barrier()
 305
 306 /*
 307  * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 308  * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 309  * with different data, whether clean or not) to operate
 310  */
 311 #ifdef CONFIG_PA8X00
 312 extern int _parisc_requires_coherency;
 313 #define parisc_requires_coherency()     _parisc_requires_coherency
 314 #else
 315 #define parisc_requires_coherency()     (0)
 316 #endif
 317
 318 #endif /* __ASSEMBLY__ */
 319
 320 #endif /* __ASM_PARISC_PROCESSOR_H */