diff options
Diffstat (limited to 'include/asm-blackfin')
| -rw-r--r-- | include/asm-blackfin/cplb-mpu.h | 61 | ||||
| -rw-r--r-- | include/asm-blackfin/cplb.h | 4 | ||||
| -rw-r--r-- | include/asm-blackfin/cplbinit.h | 8 | ||||
| -rw-r--r-- | include/asm-blackfin/mmu.h | 4 | ||||
| -rw-r--r-- | include/asm-blackfin/mmu_context.h | 62 |
5 files changed, 133 insertions, 6 deletions
diff --git a/include/asm-blackfin/cplb-mpu.h b/include/asm-blackfin/cplb-mpu.h new file mode 100644 index 000000000000..75c67b99d607 --- /dev/null +++ b/include/asm-blackfin/cplb-mpu.h @@ -0,0 +1,61 @@ +/* + * File: include/asm-blackfin/cplbinit.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 __ASM_BFIN_CPLB_MPU_H +#define __ASM_BFIN_CPLB_MPU_H + +struct cplb_entry { + unsigned long data, addr; +}; + +struct mem_region { + unsigned long start, end; + unsigned long dcplb_data; + unsigned long icplb_data; +}; + +extern struct cplb_entry dcplb_tbl[MAX_CPLBS]; +extern struct cplb_entry icplb_tbl[MAX_CPLBS]; +extern int first_switched_icplb; +extern int first_mask_dcplb; +extern int first_switched_dcplb; + +extern int nr_dcplb_miss, nr_icplb_miss, nr_icplb_supv_miss, nr_dcplb_prot; +extern int nr_cplb_flush; + +extern int page_mask_order; +extern int page_mask_nelts; + +extern unsigned long *current_rwx_mask; + +extern void flush_switched_cplbs(void); +extern void set_mask_dcplbs(unsigned long *); + +extern void __noreturn panic_cplb_error(int seqstat, struct pt_regs *); + +#endif /* __ASM_BFIN_CPLB_MPU_H */ diff --git a/include/asm-blackfin/cplb.h b/include/asm-blackfin/cplb.h index 06828d77a58f..654375c2b746 100644 --- a/include/asm-blackfin/cplb.h +++ b/include/asm-blackfin/cplb.h @@ -65,7 +65,11 @@ #define SIZE_1M 0x00100000 /* 1M */ #define SIZE_4M 0x00400000 /* 4M */ +#ifdef CONFIG_MPU +#define MAX_CPLBS 16 +#else #define MAX_CPLBS (16 * 2) +#endif #define ASYNC_MEMORY_CPLB_COVERAGE ((ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \ ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE) / SIZE_4M) diff --git a/include/asm-blackfin/cplbinit.h b/include/asm-blackfin/cplbinit.h index c4d0596e8e9f..0eb1c1b685a7 100644 --- a/include/asm-blackfin/cplbinit.h +++ b/include/asm-blackfin/cplbinit.h @@ -33,6 +33,12 @@ #include <asm/blackfin.h> #include <asm/cplb.h> +#ifdef CONFIG_MPU + +#include <asm/cplb-mpu.h> + +#else + #define INITIAL_T 0x1 #define SWITCH_T 0x2 #define I_CPLB 0x4 @@ -79,6 +85,8 @@ extern u_long ipdt_swapcount_table[]; extern u_long dpdt_swapcount_table[]; #endif +#endif /* CONFIG_MPU */ + extern unsigned long reserved_mem_dcache_on; extern unsigned long reserved_mem_icache_on; diff --git a/include/asm-blackfin/mmu.h b/include/asm-blackfin/mmu.h index 11d52f1167d0..757e43906ed4 100644 --- a/include/asm-blackfin/mmu.h +++ b/include/asm-blackfin/mmu.h @@ -24,7 +24,9 @@ typedef struct { unsigned long exec_fdpic_loadmap; unsigned long interp_fdpic_loadmap; #endif - +#ifdef CONFIG_MPU + unsigned long *page_rwx_mask; +#endif } mm_context_t; #endif diff --git a/include/asm-blackfin/mmu_context.h b/include/asm-blackfin/mmu_context.h index c5c71a6aaf19..b5eb67596ad5 100644 --- a/include/asm-blackfin/mmu_context.h +++ b/include/asm-blackfin/mmu_context.h @@ -30,9 +30,12 @@ #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; @@ -50,6 +53,12 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 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; } @@ -73,6 +82,11 @@ static inline void destroy_context(struct mm_struct *mm) 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 @@ -106,9 +120,21 @@ activate_l1stack(struct mm_struct *mm, unsigned long sp_base) #define deactivate_mm(tsk,mm) do { } while (0) -static inline void activate_mm(struct mm_struct *prev_mm, - struct mm_struct *next_mm) +#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) @@ -120,10 +146,36 @@ static inline void activate_mm(struct mm_struct *prev_mm, 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) +#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) { - activate_mm(prev, next); + flush_switched_cplbs(); + set_mask_dcplbs(mm->context.page_rwx_mask); } +#endif #endif |