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 #endif
  49
  50 #ifndef __ASSEMBLY__
  51
  52 unsigned long calc_max_stack_size(unsigned long stack_max);
  53
  54 /*
  55  * Data detected about CPUs at boot time which is the same for all CPU's.
  56  * HP boxes are SMP - ie identical processors.
  57  *
  58  * FIXME: some CPU rev info may be processor specific...
  59  */
  60 struct system_cpuinfo_parisc {
  61         unsigned int    cpu_count;
  62         unsigned int    cpu_hz;
  63         unsigned int    hversion;
  64         unsigned int    sversion;
  65         enum cpu_type   cpu_type;
  66
  67         struct {
  68                 struct pdc_model model;
  69                 unsigned long versions;
  70                 unsigned long cpuid;
  71                 unsigned long capabilities;
  72                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
  73         } pdc;
  74
  75         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
  76         const char      *family_name;   /* e.g. "1.1e" */
  77 };
  78
  79
  80 /* Per CPU data structure - ie varies per CPU.  */
  81 struct cpuinfo_parisc {
  82         unsigned long it_value;     /* Interval Timer at last timer Intr */
  83         unsigned long irq_count;    /* number of IRQ's since boot */
  84         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
  85         unsigned long hpa;          /* Host Physical address */
  86         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
  87 #ifdef CONFIG_SMP
  88         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
  89 #endif
  90         unsigned long bh_count;     /* number of times bh was invoked */
  91         unsigned long fp_rev;
  92         unsigned long fp_model;
  93         unsigned long cpu_num;      /* CPU number from PAT firmware */
  94         unsigned long cpu_loc;      /* CPU location from PAT firmware */
  95         unsigned int state;
  96         struct parisc_device *dev;
  97 };
  98
  99 extern struct system_cpuinfo_parisc boot_cpu_data;
 100 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 101
 102 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 103
 104 typedef struct {
 105         int seg;
 106 } mm_segment_t;
 107
 108 #define ARCH_MIN_TASKALIGN      8
 109
 110 struct thread_struct {
 111         struct pt_regs regs;
 112         unsigned long  task_size;
 113         unsigned long  map_base;
 114         unsigned long  flags;
 115 };
 116
 117 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
 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 struct task_struct;
 155 void show_trace(struct task_struct *task, unsigned long *stack);
 156
 157 /*
 158  * Start user thread in another space.
 159  *
 160  * Note that we set both the iaoq and r31 to the new pc. When
 161  * the kernel initially calls execve it will return through an
 162  * rfi path that will use the values in the iaoq. The execve
 163  * syscall path will return through the gateway page, and
 164  * that uses r31 to branch to.
 165  *
 166  * For ELF we clear r23, because the dynamic linker uses it to pass
 167  * the address of the finalizer function.
 168  *
 169  * We also initialize sr3 to an illegal value (illegal for our
 170  * implementation, not for the architecture).
 171  */
 172 typedef unsigned int elf_caddr_t;
 173
 174 /* The ELF abi wants things done a "wee bit" differently than
 175  * som does.  Supporting this behavior here avoids
 176  * having our own version of create_elf_tables.
 177  *
 178  * Oh, and yes, that is not a typo, we are really passing argc in r25
 179  * and argv in r24 (rather than r26 and r25).  This is because that's
 180  * where __libc_start_main wants them.
 181  *
 182  * Duplicated from dl-machine.h for the benefit of readers:
 183  *
 184  *  Our initial stack layout is rather different from everyone else's
 185  *  due to the unique PA-RISC ABI.  As far as I know it looks like
 186  *  this:
 187
 188    -----------------------------------  (user startup code creates this frame)
 189    |         32 bytes of magic       |
 190    |---------------------------------|
 191    | 32 bytes argument/sp save area  |
 192    |---------------------------------| (bprm->p)
 193    |        ELF auxiliary info       |
 194    |         (up to 28 words)        |
 195    |---------------------------------|
 196    |               NULL              |
 197    |---------------------------------|
 198    |       Environment pointers      |
 199    |---------------------------------|
 200    |               NULL              |
 201    |---------------------------------|
 202    |        Argument pointers        |
 203    |---------------------------------| <- argv
 204    |          argc (1 word)          |
 205    |---------------------------------| <- bprm->exec (HACK!)
 206    |         N bytes of slack        |
 207    |---------------------------------|
 208    |    filename passed to execve    |
 209    |---------------------------------| (mm->env_end)
 210    |           env strings           |
 211    |---------------------------------| (mm->env_start, mm->arg_end)
 212    |           arg strings           |
 213    |---------------------------------|
 214    | additional faked arg strings if |
 215    | we're invoked via binfmt_script |
 216    |---------------------------------| (mm->arg_start)
 217    stack base is at TASK_SIZE - rlim_max.
 218
 219 on downward growing arches, it looks like this:
 220    stack base at TASK_SIZE
 221    | filename passed to execve
 222    | env strings
 223    | arg strings
 224    | faked arg strings
 225    | slack
 226    | ELF
 227    | envps
 228    | argvs
 229    | argc
 230
 231  *  The pleasant part of this is that if we need to skip arguments we
 232  *  can just decrement argc and move argv, because the stack pointer
 233  *  is utterly unrelated to the location of the environment and
 234  *  argument vectors.
 235  *
 236  * Note that the S/390 people took the easy way out and hacked their
 237  * GCC to make the stack grow downwards.
 238  *
 239  * Final Note: For entry from syscall, the W (wide) bit of the PSW
 240  * is stuffed into the lowest bit of the user sp (%r30), so we fill
 241  * it in here from the current->personality
 242  */
 243
 244 #define USER_WIDE_MODE  (!is_32bit_task())
 245
 246 #define start_thread(regs, new_pc, new_sp) do {         \
 247         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 248         __u32 spaceid = (__u32)current->mm->context;    \
 249         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 250         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 251                                                         \
 252         regs->iasq[0] = spaceid;                        \
 253         regs->iasq[1] = spaceid;                        \
 254         regs->iaoq[0] = pc;                             \
 255         regs->iaoq[1] = pc + 4;                         \
 256         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 257         regs->sr[3] = 0xffff;                           \
 258         regs->sr[4] = spaceid;                          \
 259         regs->sr[5] = spaceid;                          \
 260         regs->sr[6] = spaceid;                          \
 261         regs->sr[7] = spaceid;                          \
 262         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 263         regs->fr[ 0] = 0LL;                             \
 264         regs->fr[ 1] = 0LL;                             \
 265         regs->fr[ 2] = 0LL;                             \
 266         regs->fr[ 3] = 0LL;                             \
 267         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 268         regs->gr[31] = pc;                              \
 269                                                         \
 270         get_user(regs->gr[25], (argv - 1));             \
 271         regs->gr[24] = (long) argv;                     \
 272         regs->gr[23] = 0;                               \
 273 } while(0)
 274
 275 struct task_struct;
 276 struct mm_struct;
 277
 278 /* Free all resources held by a thread. */
 279 extern void release_thread(struct task_struct *);
 280
 281 extern unsigned long get_wchan(struct task_struct *p);
 282
 283 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 284 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 285
 286 #define cpu_relax()     barrier()
 287
 288 /*
 289  * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 290  * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 291  * with different data, whether clean or not) to operate
 292  */
 293 #ifdef CONFIG_PA8X00
 294 extern int _parisc_requires_coherency;
 295 #define parisc_requires_coherency()     _parisc_requires_coherency
 296 #else
 297 #define parisc_requires_coherency()     (0)
 298 #endif
 299
 300 extern int running_on_qemu;
 301
 302 #endif /* __ASSEMBLY__ */
 303
 304 #endif /* __ASM_PARISC_PROCESSOR_H */