55ccf3fe3f
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>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_PROCESSOR_H
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#define _ASM_C6X_PROCESSOR_H
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#include <asm/ptrace.h>
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#include <asm/page.h>
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#include <asm/current.h>
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() \
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({ \
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void *__pc; \
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asm("mvc .S2 pce1,%0\n" : "=b"(__pc)); \
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__pc; \
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})
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/*
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* User space process size. This is mostly meaningless for NOMMU
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* but some C6X processors may have RAM addresses up to 0xFFFFFFFF.
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* Since calls like mmap() can return an address or an error, we
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* have to allow room for error returns when code does something
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* like:
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*
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* addr = do_mmap(...)
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* if ((unsigned long)addr >= TASK_SIZE)
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* ... its an error code, not an address ...
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*
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* Here, we allow for 4096 error codes which means we really can't
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* use the last 4K page on systems with RAM extending all the way
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* to the end of the 32-bit address space.
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*/
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#define TASK_SIZE 0xFFFFF000
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's. We won't be using it
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*/
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#define TASK_UNMAPPED_BASE 0
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struct thread_struct {
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unsigned long long b15_14;
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unsigned long long a15_14;
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unsigned long long b13_12;
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unsigned long long a13_12;
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unsigned long long b11_10;
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unsigned long long a11_10;
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unsigned long long ricl_icl;
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unsigned long usp; /* user stack pointer */
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unsigned long pc; /* kernel pc */
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unsigned long wchan;
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};
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#define INIT_THREAD \
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{ \
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.usp = 0, \
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.wchan = 0, \
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}
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#define INIT_MMAP { \
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&init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
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NULL, NULL }
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#define task_pt_regs(task) \
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((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1)
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#define alloc_kernel_stack() __get_free_page(GFP_KERNEL)
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#define free_kernel_stack(page) free_page((page))
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/* Forward declaration, a strange C thing */
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struct task_struct;
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extern void start_thread(struct pt_regs *regs, unsigned int pc,
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unsigned long usp);
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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#define copy_segments(tsk, mm) do { } while (0)
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#define release_segments(mm) do { } while (0)
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/*
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* saved PC of a blocked thread.
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*/
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#define thread_saved_pc(tsk) (task_pt_regs(tsk)->pc)
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/*
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* saved kernel SP and DP of a blocked thread.
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*/
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#ifdef _BIG_ENDIAN
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#define thread_saved_ksp(tsk) \
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(*(unsigned long *)&(tsk)->thread.b15_14)
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#define thread_saved_dp(tsk) \
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(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
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#else
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#define thread_saved_ksp(tsk) \
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(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
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#define thread_saved_dp(tsk) \
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(*(unsigned long *)&(tsk)->thread.b15_14)
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#endif
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extern unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(task) (task_pt_regs(task)->pc)
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#define KSTK_ESP(task) (task_pt_regs(task)->sp)
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#define cpu_relax() do { } while (0)
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extern const struct seq_operations cpuinfo_op;
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/* Reset the board */
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#define HARD_RESET_NOW()
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extern unsigned int c6x_core_freq;
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extern void (*c6x_restart)(void);
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extern void (*c6x_halt)(void);
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#endif /* ASM_C6X_PROCESSOR_H */
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