mmu_context.h

来自「linux 内核源代码」· C头文件 代码 · 共 130 行

/*
 * File:         include/asm-blackfin/mmu_context.h
 * Based on:
 * Author:
 *
 * Created:
 * Description:
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __BLACKFIN_MMU_CONTEXT_H__
#define __BLACKFIN_MMU_CONTEXT_H__

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>

extern void *current_l1_stack_save;
extern int nr_l1stack_tasks;
extern void *l1_stack_base;
extern unsigned long l1_stack_len;

extern int l1sram_free(const void*);
extern void *l1sram_alloc_max(void*);

static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}

/* Called when creating a new context during fork() or execve().  */
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	return 0;
}

static inline void free_l1stack(void)
{
	nr_l1stack_tasks--;
	if (nr_l1stack_tasks == 0)
		l1sram_free(l1_stack_base);
}
static inline void destroy_context(struct mm_struct *mm)
{
	struct sram_list_struct *tmp;

	if (current_l1_stack_save == mm->context.l1_stack_save)
		current_l1_stack_save = 0;
	if (mm->context.l1_stack_save)
		free_l1stack();

	while ((tmp = mm->context.sram_list)) {
		mm->context.sram_list = tmp->next;
		sram_free(tmp->addr);
		kfree(tmp);
	}
}

static inline unsigned long
alloc_l1stack(unsigned long length, unsigned long *stack_base)
{
	if (nr_l1stack_tasks == 0) {
		l1_stack_base = l1sram_alloc_max(&l1_stack_len);
		if (!l1_stack_base)
			return 0;
	}

	if (l1_stack_len < length) {
		if (nr_l1stack_tasks == 0)
			l1sram_free(l1_stack_base);
		return 0;
	}
	*stack_base = (unsigned long)l1_stack_base;
	nr_l1stack_tasks++;
	return l1_stack_len;
}

static inline int
activate_l1stack(struct mm_struct *mm, unsigned long sp_base)
{
	if (current_l1_stack_save)
		memcpy(current_l1_stack_save, l1_stack_base, l1_stack_len);
	mm->context.l1_stack_save = current_l1_stack_save = (void*)sp_base;
	memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len);
	return 1;
}

#define deactivate_mm(tsk,mm)	do { } while (0)

static inline void activate_mm(struct mm_struct *prev_mm,
			       struct mm_struct *next_mm)
{
	if (!next_mm->context.l1_stack_save)
		return;
	if (next_mm->context.l1_stack_save == current_l1_stack_save)
		return;
	if (current_l1_stack_save) {
		memcpy(current_l1_stack_save, l1_stack_base, l1_stack_len);
	}
	current_l1_stack_save = next_mm->context.l1_stack_save;
	memcpy(l1_stack_base, current_l1_stack_save, l1_stack_len);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	activate_mm(prev, next);
}

#endif