diff options
Diffstat (limited to 'include/asm-blackfin/mmu_context.h')
| -rw-r--r-- | include/asm-blackfin/mmu_context.h | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/include/asm-blackfin/mmu_context.h b/include/asm-blackfin/mmu_context.h deleted file mode 100644 index 8529552..0000000 --- a/include/asm-blackfin/mmu_context.h +++ /dev/null @@ -1,183 +0,0 @@ -/* - * 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 <linux/gfp.h> -#include <linux/sched.h> -#include <asm/setup.h> -#include <asm/page.h> -#include <asm/pgalloc.h> -#include <asm/cplbinit.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) -{ -#ifdef CONFIG_MPU - unsigned long p = __get_free_pages(GFP_KERNEL, page_mask_order); - mm->context.page_rwx_mask = (unsigned long *)p; - memset(mm->context.page_rwx_mask, 0, - page_mask_nelts * 3 * sizeof(long)); -#endif - 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 = NULL; - 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); - } -#ifdef CONFIG_MPU - if (current_rwx_mask == mm->context.page_rwx_mask) - current_rwx_mask = NULL; - free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order); -#endif -} - -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) - -#define activate_mm(prev, next) switch_mm(prev, next, NULL) - -static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm, - struct task_struct *tsk) -{ - if (prev_mm == next_mm) - return; -#ifdef CONFIG_MPU - if (prev_mm->context.page_rwx_mask == current_rwx_mask) { - flush_switched_cplbs(); - set_mask_dcplbs(next_mm->context.page_rwx_mask); - } -#endif - - /* L1 stack switching. */ - 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); -} - -#ifdef CONFIG_MPU -static inline void protect_page(struct mm_struct *mm, unsigned long addr, - unsigned long flags) -{ - unsigned long *mask = mm->context.page_rwx_mask; - unsigned long page = addr >> 12; - unsigned long idx = page >> 5; - unsigned long bit = 1 << (page & 31); - - if (flags & VM_MAYREAD) - mask[idx] |= bit; - else - mask[idx] &= ~bit; - mask += page_mask_nelts; - if (flags & VM_MAYWRITE) - mask[idx] |= bit; - else - mask[idx] &= ~bit; - mask += page_mask_nelts; - if (flags & VM_MAYEXEC) - mask[idx] |= bit; - else - mask[idx] &= ~bit; -} - -static inline void update_protections(struct mm_struct *mm) -{ - if (mm->context.page_rwx_mask == current_rwx_mask) { - flush_switched_cplbs(); - set_mask_dcplbs(mm->context.page_rwx_mask); - } -} -#endif - -#endif |
