LXR linux/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
  52unsigned 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 */
  60struct 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.  */
  81struct 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
  99extern struct system_cpuinfo_parisc boot_cpu_data;
 100DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 101
 102#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 103
 104typedef struct {
 105        int seg;  
 106} mm_segment_t;
 107
 108#define ARCH_MIN_TASKALIGN      8
 109
 110struct 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
 154struct task_struct;
 155void 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 */
 172typedef 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
 219on 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
 275struct mm_struct;
 276
 277/* Free all resources held by a thread. */
 278extern void release_thread(struct task_struct *);
 279
 280extern unsigned long get_wchan(struct task_struct *p);
 281
 282#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 283#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 284
 285#define cpu_relax()     barrier()
 286
 287/*
 288 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 289 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 290 * with different data, whether clean or not) to operate
 291 */
 292#ifdef CONFIG_PA8X00
 293extern int _parisc_requires_coherency;
 294#define parisc_requires_coherency()     _parisc_requires_coherency
 295#else
 296#define parisc_requires_coherency()     (0)
 297#endif
 298
 299extern int running_on_qemu;
 300
 301#endif /* __ASSEMBLY__ */
 302
 303#endif /* __ASM_PARISC_PROCESSOR_H */
 304