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7c7fcf762e
Save the current exception frame pointer in the thread_info struct rather than in a global variable as the latter makes SMP tricky, especially when preemption is also enabled. This also replaces __frame with current_frame() and rearranges header file inclusions to make it all compile. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
193 lines
4.8 KiB
C
193 lines
4.8 KiB
C
/* MN10300 Processor specifics
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_PROCESSOR_H
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#define _ASM_PROCESSOR_H
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#include <linux/threads.h>
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#include <linux/thread_info.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/cpu-regs.h>
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#include <asm/uaccess.h>
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#include <asm/current.h>
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/* Forward declaration, a strange C thing */
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struct task_struct;
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struct mm_struct;
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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("mov pc,%0" : "=a"(__pc)); \
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__pc; \
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})
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extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
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extern void show_registers(struct pt_regs *regs);
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/*
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* CPU type and hardware bug flags. Kept separately for each CPU.
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* Members of this structure are referenced in head.S, so think twice
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* before touching them. [mj]
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*/
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struct mn10300_cpuinfo {
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int type;
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unsigned long loops_per_jiffy;
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char hard_math;
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};
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extern struct mn10300_cpuinfo boot_cpu_data;
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#ifdef CONFIG_SMP
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#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
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# error Sorry, NR_CPUS should be 2 to 8
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#endif
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extern struct mn10300_cpuinfo cpu_data[];
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#define current_cpu_data cpu_data[smp_processor_id()]
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#else /* CONFIG_SMP */
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#define cpu_data &boot_cpu_data
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#define current_cpu_data boot_cpu_data
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#endif /* CONFIG_SMP */
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extern void identify_cpu(struct mn10300_cpuinfo *);
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extern void print_cpu_info(struct mn10300_cpuinfo *);
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extern void dodgy_tsc(void);
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#define cpu_relax() barrier()
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/*
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* User space process size: 1.75GB (default).
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*/
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#define TASK_SIZE 0x70000000
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/*
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* Where to put the userspace stack by default
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*/
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#define STACK_TOP 0x70000000
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#define STACK_TOP_MAX STACK_TOP
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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.
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*/
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#define TASK_UNMAPPED_BASE 0x30000000
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struct fpu_state_struct {
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unsigned long fs[32]; /* fpu registers */
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unsigned long fpcr; /* fpu control register */
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};
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struct thread_struct {
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struct pt_regs *uregs; /* userspace register frame */
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unsigned long pc; /* kernel PC */
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unsigned long sp; /* kernel SP */
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unsigned long a3; /* kernel FP */
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unsigned long wchan;
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unsigned long usp;
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unsigned long fpu_flags;
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#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
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#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
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struct fpu_state_struct fpu_state;
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};
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#define INIT_THREAD \
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{ \
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.uregs = init_uregs, \
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.pc = 0, \
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.sp = 0, \
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.a3 = 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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/*
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* do necessary setup to start up a newly executed thread
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* - need to discard the frame stacked by the kernel thread invoking the execve
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* syscall (see RESTORE_ALL macro)
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*/
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static inline void start_thread(struct pt_regs *regs,
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unsigned long new_pc, unsigned long new_sp)
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{
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struct thread_info *ti = current_thread_info();
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struct pt_regs *frame0;
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set_fs(USER_DS);
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frame0 = thread_info_to_uregs(ti);
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frame0->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
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frame0->pc = new_pc;
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frame0->sp = new_sp;
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ti->frame = frame0;
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}
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/* Free all resources held by a thread. */
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extern void release_thread(struct task_struct *);
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/* Prepare to copy thread state - unlazy all lazy status */
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extern void prepare_to_copy(struct task_struct *tsk);
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/*
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* create a kernel thread without removing it from tasklists
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*/
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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/*
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* Return saved PC of a blocked thread.
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*/
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extern unsigned long thread_saved_pc(struct task_struct *tsk);
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unsigned long get_wchan(struct task_struct *p);
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#define task_pt_regs(task) ((task)->thread.uregs)
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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 KSTK_TOP(info) \
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({ \
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(unsigned long)(info) + THREAD_SIZE; \
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})
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#define ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCHW
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static inline void prefetch(const void *x)
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{
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#ifdef CONFIG_MN10300_CACHE_ENABLED
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#ifdef CONFIG_MN10300_PROC_MN103E010
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asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
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#else
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asm volatile ("dcpf (%0)" : : "r"(x));
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#endif
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#endif
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}
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static inline void prefetchw(const void *x)
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{
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#ifdef CONFIG_MN10300_CACHE_ENABLED
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#ifdef CONFIG_MN10300_PROC_MN103E010
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asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
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#else
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asm volatile ("dcpf (%0)" : : "r"(x));
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#endif
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#endif
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}
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#endif /* _ASM_PROCESSOR_H */
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