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linux/arch/mn10300/include/asm/processor.h
Suresh Siddha 55ccf3fe3f fork: move the real prepare_to_copy() users to arch_dup_task_struct() 
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of
the architectures and the rest following the x86 model of flushing the extended
register state like fpu there.

Remove it and use the arch_dup_task_struct() instead.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2012-05-16 15:16:26 -07:00

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/* MN10300 Processor specifics
*
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H
#include <linux/threads.h>
#include <linux/thread_info.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/cpu-regs.h>
#include <asm/uaccess.h>
#include <asm/current.h>
/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() \
({ \
void *__pc; \
asm("mov pc,%0" : "=a"(__pc)); \
__pc; \
})
extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
extern void show_registers(struct pt_regs *regs);
/*
* CPU type and hardware bug flags. Kept separately for each CPU.
* Members of this structure are referenced in head.S, so think twice
* before touching them. [mj]
*/
struct mn10300_cpuinfo {
int type;
unsigned long loops_per_jiffy;
char hard_math;
};
extern struct mn10300_cpuinfo boot_cpu_data;
#ifdef CONFIG_SMP
#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
# error Sorry, NR_CPUS should be 2 to 8
#endif
extern struct mn10300_cpuinfo cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else /* CONFIG_SMP */
#define cpu_data &boot_cpu_data
#define current_cpu_data boot_cpu_data
#endif /* CONFIG_SMP */
extern void identify_cpu(struct mn10300_cpuinfo *);
extern void print_cpu_info(struct mn10300_cpuinfo *);
extern void dodgy_tsc(void);
#define cpu_relax() barrier()
/*
* User space process size: 1.75GB (default).
*/
#define TASK_SIZE 0x70000000
/*
* Where to put the userspace stack by default
*/
#define STACK_TOP 0x70000000
#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 0x30000000
struct fpu_state_struct {
unsigned long fs[32]; /* fpu registers */
unsigned long fpcr; /* fpu control register */
};
struct thread_struct {
struct pt_regs *uregs; /* userspace register frame */
unsigned long pc; /* kernel PC */
unsigned long sp; /* kernel SP */
unsigned long a3; /* kernel FP */
unsigned long wchan;
unsigned long usp;
unsigned long fpu_flags;
#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
struct fpu_state_struct fpu_state;
};
#define INIT_THREAD \
{ \
.uregs = init_uregs, \
.pc = 0, \
.sp = 0, \
.a3 = 0, \
.wchan = 0, \
}
#define INIT_MMAP \
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
NULL, NULL }
/*
* do necessary setup to start up a newly executed thread
* - need to discard the frame stacked by the kernel thread invoking the execve
* syscall (see RESTORE_ALL macro)
*/
static inline void start_thread(struct pt_regs *regs,
unsigned long new_pc, unsigned long new_sp)
{
struct thread_info *ti = current_thread_info();
struct pt_regs *frame0;
frame0 = thread_info_to_uregs(ti);
frame0->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
frame0->pc = new_pc;
frame0->sp = new_sp;
ti->frame = frame0;
}
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/*
* Return saved PC of a blocked thread.
*/
extern unsigned long thread_saved_pc(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(task) ((task)->thread.uregs)
#define KSTK_EIP(task) (task_pt_regs(task)->pc)
#define KSTK_ESP(task) (task_pt_regs(task)->sp)
#define KSTK_TOP(info) \
({ \
(unsigned long)(info) + THREAD_SIZE; \
})
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
static inline void prefetch(const void *x)
{
#ifdef CONFIG_MN10300_CACHE_ENABLED
#ifdef CONFIG_MN10300_PROC_MN103E010
asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
#else
asm volatile ("dcpf (%0)" : : "r"(x));
#endif
#endif
}
static inline void prefetchw(const void *x)
{
#ifdef CONFIG_MN10300_CACHE_ENABLED
#ifdef CONFIG_MN10300_PROC_MN103E010
asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
#else
asm volatile ("dcpf (%0)" : : "r"(x));
#endif
#endif
}
#endif /* _ASM_PROCESSOR_H */
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