b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
186 lines
4.5 KiB
C
186 lines
4.5 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 <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 <linux/threads.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 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_sec;
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char hard_math;
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unsigned long *pgd_quick;
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unsigned long *pte_quick;
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unsigned long pgtable_cache_sz;
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};
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extern struct mn10300_cpuinfo boot_cpu_data;
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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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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() do {} while (0)
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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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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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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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struct pt_regs *__frame;
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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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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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.__frame = NULL, \
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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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#define start_thread(regs, new_pc, new_sp) do { \
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set_fs(USER_DS); \
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__frame = current->thread.uregs; \
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__frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM; \
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__frame->pc = new_pc; \
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__frame->sp = new_sp; \
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} while (0)
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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) \
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({ \
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struct pt_regs *__regs__; \
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__regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
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__regs__ - 1; \
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})
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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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#ifndef CONFIG_MN10300_CACHE_DISABLED
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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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#ifndef CONFIG_MN10300_CACHE_DISABLED
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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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