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/* 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 regs;
struct pt_regs *segv_regs;
int singlestep_syscall;
void *fault_addr;
jmp_buf *fault_catcher;
struct task_struct *prev_sched;
struct arch_thread arch;
jmp_buf switch_buf;
struct {
int op;
union {
struct {
int pid;
} fork, exec;
struct {
int (*proc)(void *);
void *arg;
} thread;
struct {
void (*proc)(void *);
void *arg;
} cb;
} u;
} request;
};
#define INIT_THREAD \
{ \
.regs = EMPTY_REGS, \
.fault_addr = NULL, \
.prev_sched = NULL, \
.arch = INIT_ARCH_THREAD, \
.request = { 0 } \
}
/*
* 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 ipi_pipe[2];
int cache_alignment;
union {
__u32 x86_capability[NCAPINTS + NBUGINTS];
unsigned long x86_capability_alignment;
};
};
extern struct cpuinfo_um boot_cpu_data;
#define cpu_data(cpu) boot_cpu_data
#define current_cpu_data boot_cpu_data
#define cache_line_size() (boot_cpu_data.cache_alignment)
extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
extern unsigned long __get_wchan(struct task_struct *p);
#endif
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