arch/parisc/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/asm-parisc/processor.h
   4  *
   5  * Copyright (C) 1994 Linus Torvalds
   6  * Copyright (C) 2001 Grant Grundler
   7  */
   8
   9 #ifndef __ASM_PARISC_PROCESSOR_H
  10 #define __ASM_PARISC_PROCESSOR_H
  11
  12 #ifndef __ASSEMBLY__
  13 #include <linux/threads.h>
  14
  15 #include <asm/prefetch.h>
  16 #include <asm/hardware.h>
  17 #include <asm/pdc.h>
  18 #include <asm/ptrace.h>
  19 #include <asm/types.h>
  20 #include <asm/percpu.h>
  21 #endif /* __ASSEMBLY__ */
  22
  23 #define HAVE_ARCH_PICK_MMAP_LAYOUT
  24
  25 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  26 #define TASK_SIZE               TASK_SIZE_OF(current)
  27 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  28
  29 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
  30 #define DEFAULT_MAP_BASE32      (0x40000000UL)
  31
  32 #ifdef CONFIG_64BIT
  33 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
  34 #define DEFAULT_MAP_BASE        (0x200000000UL)
  35 #else
  36 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
  37 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
  38 #endif
  39
  40 #ifdef __KERNEL__
  41
  42 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
  43  * prumpf */
  44
  45 #define STACK_TOP       TASK_SIZE
  46 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
  47
  48 /* Allow bigger stacks for 64-bit processes */
  49 #define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
  50                          ? (1 << 30)    /* 1 GB */                      \
  51                          : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
  52
  53 #endif
  54
  55 #ifndef __ASSEMBLY__
  56
  57 /*
  58  * Data detected about CPUs at boot time which is the same for all CPU's.
  59  * HP boxes are SMP - ie identical processors.
  60  *
  61  * FIXME: some CPU rev info may be processor specific...
  62  */
  63 struct system_cpuinfo_parisc {
  64         unsigned int    cpu_count;
  65         unsigned int    cpu_hz;
  66         unsigned int    hversion;
  67         unsigned int    sversion;
  68         enum cpu_type   cpu_type;
  69
  70         struct {
  71                 struct pdc_model model;
  72                 unsigned long versions;
  73                 unsigned long cpuid;
  74                 unsigned long capabilities;
  75                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  76         } pdc;
  77
  78         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  79         const char      *family_name;   /* e.g. "1.1e" */
  80 };
  81
  82
  83 /* Per CPU data structure - ie varies per CPU.  */
  84 struct cpuinfo_parisc {
  85         unsigned long it_value;     /* Interval Timer at last timer Intr */
  86         unsigned long irq_count;    /* number of IRQ's since boot */
  87         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  88         unsigned long hpa;          /* Host Physical address */
  89         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  90 #ifdef CONFIG_SMP
  91         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  92 #endif
  93         unsigned long bh_count;     /* number of times bh was invoked */
  94         unsigned long fp_rev;
  95         unsigned long fp_model;
  96         unsigned long cpu_num;      /* CPU number from PAT firmware */
  97         unsigned long cpu_loc;      /* CPU location from PAT firmware */
  98         unsigned int state;
  99         struct parisc_device *dev;
 100         unsigned long loops_per_jiffy;
 101 };
 102
 103 extern struct system_cpuinfo_parisc boot_cpu_data;
 104 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 105
 106 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 107
 108 typedef struct {
 109         int seg;
 110 } mm_segment_t;
 111
 112 #define ARCH_MIN_TASKALIGN      8
 113
 114 struct thread_struct {
 115         struct pt_regs regs;
 116         unsigned long  task_size;
 117         unsigned long  map_base;
 118         unsigned long  flags;
 119 };
 120
 121 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 122
 123 /* Thread struct flags. */
 124 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
 125 #define PARISC_UAC_SIGBUS       (1UL << 1)
 126 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
 127
 128 #define PARISC_UAC_SHIFT        0
 129 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
 130
 131 #define SET_UNALIGN_CTL(task,value)                                       \
 132         ({                                                                \
 133         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
 134                                 | (((value) << PARISC_UAC_SHIFT) &        \
 135                                    PARISC_UAC_MASK));                     \
 136         0;                                                                \
 137         })
 138
 139 #define GET_UNALIGN_CTL(task,addr)                                        \
 140         ({                                                                \
 141         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
 142                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
 143         })
 144
 145 #define INIT_THREAD { \
 146         .regs = {       .gr     = { 0, }, \
 147                         .fr     = { 0, }, \
 148                         .sr     = { 0, }, \
 149                         .iasq   = { 0, }, \
 150                         .iaoq   = { 0, }, \
 151                         .cr27   = 0, \
 152                 }, \
 153         .task_size      = DEFAULT_TASK_SIZE, \
 154         .map_base       = DEFAULT_MAP_BASE, \
 155         .flags          = 0 \
 156         }
 157
 158 struct task_struct;
 159 void 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  */
 176 typedef unsigned int elf_caddr_t;
 177
 178 /* The ELF abi wants things done a "wee bit" differently than
 179  * som does.  Supporting this behavior here avoids
 180  * having our own version of create_elf_tables.
 181  *
 182  * Oh, and yes, that is not a typo, we are really passing argc in r25
 183  * and argv in r24 (rather than r26 and r25).  This is because that's
 184  * where __libc_start_main wants them.
 185  *
 186  * Duplicated from dl-machine.h for the benefit of readers:
 187  *
 188  *  Our initial stack layout is rather different from everyone else's
 189  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 190  *  this:
 191
 192    -----------------------------------  (user startup code creates this frame)
 193    |         32 bytes of magic       |
 194    |---------------------------------|
 195    | 32 bytes argument/sp save area  |
 196    |---------------------------------| (bprm->p)
 197    |        ELF auxiliary info       |
 198    |         (up to 28 words)        |
 199    |---------------------------------|
 200    |               NULL              |
 201    |---------------------------------|
 202    |       Environment pointers      |
 203    |---------------------------------|
 204    |               NULL              |
 205    |---------------------------------|
 206    |        Argument pointers        |
 207    |---------------------------------| <- argv
 208    |          argc (1 word)          |
 209    |---------------------------------| <- bprm->exec (HACK!)
 210    |         N bytes of slack        |
 211    |---------------------------------|
 212    |    filename passed to execve    |
 213    |---------------------------------| (mm->env_end)
 214    |           env strings           |
 215    |---------------------------------| (mm->env_start, mm->arg_end)
 216    |           arg strings           |
 217    |---------------------------------|
 218    | additional faked arg strings if |
 219    | we're invoked via binfmt_script |
 220    |---------------------------------| (mm->arg_start)
 221    stack base is at TASK_SIZE - rlim_max.
 222
 223 on downward growing arches, it looks like this:
 224    stack base at TASK_SIZE
 225    | filename passed to execve
 226    | env strings
 227    | arg strings
 228    | faked arg strings
 229    | slack
 230    | ELF
 231    | envps
 232    | argvs
 233    | argc
 234
 235  *  The pleasant part of this is that if we need to skip arguments we
 236  *  can just decrement argc and move argv, because the stack pointer
 237  *  is utterly unrelated to the location of the environment and
 238  *  argument vectors.
 239  *
 240  * Note that the S/390 people took the easy way out and hacked their
 241  * GCC to make the stack grow downwards.
 242  *
 243  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 244  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 245  * it in here from the current->personality
 246  */
 247
 248 #define USER_WIDE_MODE  (!is_32bit_task())
 249
 250 #define start_thread(regs, new_pc, new_sp) do {         \
 251         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 252         __u32 spaceid = (__u32)current->mm->context;    \
 253         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 254         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 255                                                         \
 256         regs->iasq[0] = spaceid;                        \
 257         regs->iasq[1] = spaceid;                        \
 258         regs->iaoq[0] = pc;                             \
 259         regs->iaoq[1] = pc + 4;                         \
 260         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 261         regs->sr[3] = 0xffff;                           \
 262         regs->sr[4] = spaceid;                          \
 263         regs->sr[5] = spaceid;                          \
 264         regs->sr[6] = spaceid;                          \
 265         regs->sr[7] = spaceid;                          \
 266         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 267         regs->fr[ 0] = 0LL;                             \
 268         regs->fr[ 1] = 0LL;                             \
 269         regs->fr[ 2] = 0LL;                             \
 270         regs->fr[ 3] = 0LL;                             \
 271         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 272         regs->gr[31] = pc;                              \
 273                                                         \
 274         get_user(regs->gr[25], (argv - 1));             \
 275         regs->gr[24] = (long) argv;                     \
 276         regs->gr[23] = 0;                               \
 277 } while(0)
 278
 279 struct task_struct;
 280 struct mm_struct;
 281
 282 /* Free all resources held by a thread. */
 283 extern void release_thread(struct task_struct *);
 284
 285 extern unsigned long get_wchan(struct task_struct *p);
 286
 287 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 288 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 289
 290 #define cpu_relax()     barrier()
 291
 292 /*
 293  * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 294  * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 295  * with different data, whether clean or not) to operate
 296  */
 297 #ifdef CONFIG_PA8X00
 298 extern int _parisc_requires_coherency;
 299 #define parisc_requires_coherency()     _parisc_requires_coherency
 300 #else
 301 #define parisc_requires_coherency()     (0)
 302 #endif
 303
 304 extern int running_on_qemu;
 305
 306 #endif /* __ASSEMBLY__ */
 307
 308 #endif /* __ASM_PARISC_PROCESSOR_H */