LXR linux/arch/sparc/include/asm/processor

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* include/asm/processor.h
   3 *
   4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   5 */
   6
   7#ifndef __ASM_SPARC_PROCESSOR_H
   8#define __ASM_SPARC_PROCESSOR_H
   9
  10#include <asm/psr.h>
  11#include <asm/ptrace.h>
  12#include <asm/head.h>
  13#include <asm/signal.h>
  14#include <asm/page.h>
  15
  16/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
  17 * That one page is used to protect kernel from intruders, so that
  18 * we can make our access_ok test faster
  19 */
  20#define TASK_SIZE       PAGE_OFFSET
  21#ifdef __KERNEL__
  22#define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
  23#define STACK_TOP_MAX   STACK_TOP
  24#endif /* __KERNEL__ */
  25
  26struct task_struct;
  27
  28#ifdef __KERNEL__
  29struct fpq {
  30        unsigned long *insn_addr;
  31        unsigned long insn;
  32};
  33#endif
  34
  35typedef struct {
  36        int seg;
  37} mm_segment_t;
  38
  39/* The Sparc processor specific thread struct. */
  40struct thread_struct {
  41        struct pt_regs *kregs;
  42        unsigned int _pad1;
  43
  44        /* Special child fork kpsr/kwim values. */
  45        unsigned long fork_kpsr __attribute__ ((aligned (8)));
  46        unsigned long fork_kwim;
  47
  48        /* Floating point regs */
  49        unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  50        unsigned long   fsr;
  51        unsigned long   fpqdepth;
  52        struct fpq      fpqueue[16];
  53        unsigned long flags;
  54        mm_segment_t current_ds;
  55};
  56
  57#define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
  58#define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
  59
  60#define INIT_THREAD  { \
  61        .flags = SPARC_FLAG_KTHREAD, \
  62        .current_ds = KERNEL_DS, \
  63}
  64
  65/* Do necessary setup to start up a newly executed thread. */
  66static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  67                                    unsigned long sp)
  68{
  69        register unsigned long zero asm("g1");
  70
  71        regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  72        regs->pc = ((pc & (~3)) - 4);
  73        regs->npc = regs->pc + 4;
  74        regs->y = 0;
  75        zero = 0;
  76        __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  77                             "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  78                             "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  79                             "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  80                             "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  81                             "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  82                             "std\t%%g0, [%0 + %3 + 0x30]\n\t"
  83                             "st\t%1, [%0 + %3 + 0x38]\n\t"
  84                             "st\t%%g0, [%0 + %3 + 0x3c]"
  85                             : /* no outputs */
  86                             : "r" (regs),
  87                               "r" (sp - sizeof(struct reg_window32)),
  88                               "r" (zero),
  89                               "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
  90                             : "memory");
  91}
  92
  93/* Free all resources held by a thread. */
  94#define release_thread(tsk)             do { } while(0)
  95
  96unsigned long get_wchan(struct task_struct *);
  97
  98#define task_pt_regs(tsk) ((tsk)->thread.kregs)
  99#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
 100#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
 101
 102#ifdef __KERNEL__
 103
 104extern struct task_struct *last_task_used_math;
 105int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 106
 107#define cpu_relax()     barrier()
 108
 109extern void (*sparc_idle)(void);
 110
 111#endif
 112
 113#endif /* __ASM_SPARC_PROCESSOR_H */
 114