arch/sparc/include/asm/processor_32.h

   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
  26 struct task_struct;
  27
  28 #ifdef __KERNEL__
  29 struct fpq {
  30         unsigned long *insn_addr;
  31         unsigned long insn;
  32 };
  33 #endif
  34
  35 /* The Sparc processor specific thread struct. */
  36 struct thread_struct {
  37         struct pt_regs *kregs;
  38         unsigned int _pad1;
  39
  40         /* Special child fork kpsr/kwim values. */
  41         unsigned long fork_kpsr __attribute__ ((aligned (8)));
  42         unsigned long fork_kwim;
  43
  44         /* Floating point regs */
  45         unsigned long   float_regs[32] __attribute__ ((aligned (8)));
  46         unsigned long   fsr;
  47         unsigned long   fpqdepth;
  48         struct fpq      fpqueue[16];
  49 };
  50
  51 #define INIT_THREAD  { \
  52         .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
  53 }
  54
  55 /* Do necessary setup to start up a newly executed thread. */
  56 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
  57                                     unsigned long sp)
  58 {
  59         register unsigned long zero asm("g1");
  60
  61         regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
  62         regs->pc = ((pc & (~3)) - 4);
  63         regs->npc = regs->pc + 4;
  64         regs->y = 0;
  65         zero = 0;
  66         __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
  67                              "std\t%%g0, [%0 + %3 + 0x08]\n\t"
  68                              "std\t%%g0, [%0 + %3 + 0x10]\n\t"
  69                              "std\t%%g0, [%0 + %3 + 0x18]\n\t"
  70                              "std\t%%g0, [%0 + %3 + 0x20]\n\t"
  71                              "std\t%%g0, [%0 + %3 + 0x28]\n\t"
  72                              "std\t%%g0, [%0 + %3 + 0x30]\n\t"
  73                              "st\t%1, [%0 + %3 + 0x38]\n\t"
  74                              "st\t%%g0, [%0 + %3 + 0x3c]"
  75                              : /* no outputs */
  76                              : "r" (regs),
  77                                "r" (sp - sizeof(struct reg_window32)),
  78                                "r" (zero),
  79                                "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
  80                              : "memory");
  81 }
  82
  83 unsigned long __get_wchan(struct task_struct *);
  84
  85 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
  86 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
  87 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
  88
  89 #ifdef __KERNEL__
  90
  91 extern struct task_struct *last_task_used_math;
  92 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
  93
  94 #define cpu_relax()     barrier()
  95
  96 extern void (*sparc_idle)(void);
  97
  98 #endif
  99
 100 #endif /* __ASM_SPARC_PROCESSOR_H */