/* SPDX-License-Identifier: GPL-2.0 */
/* include/asm/processor.h
 *
 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
 */

#ifndef __ASM_SPARC_PROCESSOR_H
#define __ASM_SPARC_PROCESSOR_H

#include <asm/psr.h>
#include <asm/ptrace.h>
#include <asm/head.h>
#include <asm/signal.h>
#include <asm/page.h>

/* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
 * That one page is used to protect kernel from intruders, so that
 * we can make our access_ok test faster
 */
#define TASK_SIZE       PAGE_OFFSET
#ifdef __KERNEL__
#define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
#define STACK_TOP_MAX   STACK_TOP
#endif /* __KERNEL__ */

struct task_struct;

#ifdef __KERNEL__
struct fpq {
        unsigned long *insn_addr;
        unsigned long insn;
};
#endif

/* The Sparc processor specific thread struct. */
struct thread_struct {
        struct pt_regs *kregs;
        unsigned int _pad1;

        /* Special child fork kpsr/kwim values. */
        unsigned long fork_kpsr __attribute__ ((aligned (8)));
        unsigned long fork_kwim;

        /* Floating point regs */
        unsigned long   float_regs[32] __attribute__ ((aligned (8)));
        unsigned long   fsr;
        unsigned long   fpqdepth;
        struct fpq      fpqueue[16];
};

#define INIT_THREAD  { \
        .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
}

/* Do necessary setup to start up a newly executed thread. */
static inline void start_thread(struct pt_regs * regs, unsigned long pc,
                                    unsigned long sp)
{
        register unsigned long zero asm("g1");

        regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
        regs->pc = ((pc & (~3)) - 4);
        regs->npc = regs->pc + 4;
        regs->y = 0;
        zero = 0;
        __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x08]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x10]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x18]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x20]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x28]\n\t"
                             "std\t%%g0, [%0 + %3 + 0x30]\n\t"
                             "st\t%1, [%0 + %3 + 0x38]\n\t"
                             "st\t%%g0, [%0 + %3 + 0x3c]"
                             : /* no outputs */
                             : "r" (regs),
                               "r" (sp - sizeof(struct reg_window32)),
                               "r" (zero),
                               "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
                             : "memory");
}

unsigned long __get_wchan(struct task_struct *);

#define task_pt_regs(tsk) ((tsk)->thread.kregs)
#define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
#define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])

#ifdef __KERNEL__

extern struct task_struct *last_task_used_math;
int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);

#define cpu_relax()     barrier()

extern void (*sparc_idle)(void);

#endif

#endif /* __ASM_SPARC_PROCESSOR_H */