/* SPDX-License-Identifier: GPL-2.0 */
/* 
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 */

#ifndef __UM_PROCESSOR_GENERIC_H
#define __UM_PROCESSOR_GENERIC_H

struct pt_regs;

struct task_struct;

#include <asm/ptrace.h>
#include <sysdep/archsetjmp.h>

#include <linux/prefetch.h>

#include <asm/cpufeatures.h>

struct mm_struct;

struct thread_struct {
        struct pt_regs *segv_regs;
        struct task_struct *prev_sched;
        struct arch_thread arch;
        jmp_buf switch_buf;
        struct {
                struct {
                        int (*proc)(void *);
                        void *arg;
                } thread;
        } request;

        void *segv_continue;

        /* Contains variable sized FP registers */
        struct pt_regs regs;
};

#define INIT_THREAD \
{ \
        .regs                   = EMPTY_REGS,   \
        .prev_sched             = NULL, \
        .arch                   = INIT_ARCH_THREAD, \
        .request                = { } \
}

/*
 * User space process size: 3GB (default).
 */
extern unsigned long task_size;

#define TASK_SIZE (task_size)

#undef STACK_TOP
#undef STACK_TOP_MAX

extern unsigned long stacksizelim;

#define STACK_ROOM      (stacksizelim)
#define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
#define STACK_TOP_MAX   STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE      (0x40000000)

extern void start_thread(struct pt_regs *regs, unsigned long entry, 
                         unsigned long stack);

struct cpuinfo_um {
        unsigned long loops_per_jiffy;
        int cache_alignment;
        union {
                __u32           x86_capability[NCAPINTS + NBUGINTS];
                unsigned long   x86_capability_alignment;
        };
};

extern struct cpuinfo_um boot_cpu_data;

#define cache_line_size()       (boot_cpu_data.cache_alignment)

#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
extern unsigned long __get_wchan(struct task_struct *p);

#endif