/* * Copyright 2004-2009 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #ifndef __BLACKFIN_MMU_CONTEXT_H__ #define __BLACKFIN_MMU_CONTEXT_H__ #include <linux/slab.h> #include <linux/sched.h> #include <linux/mm_types.h> #include <asm/setup.h> #include <asm/page.h> #include <asm/pgalloc.h> #include <asm/cplbinit.h> #include <asm/sections.h> /* Note: L1 stacks are CPU-private things, so we bluntly disable this feature in SMP mode, and use the per-CPU scratch SRAM bank only to store the PDA instead. */ 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 free_l1stack(void) { nr_l1stack_tasks--; if (nr_l1stack_tasks == 0) { l1sram_free(l1_stack_base); l1_stack_base = NULL; l1_stack_len = 0; } } 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) { #ifdef CONFIG_MPU unsigned int cpu = smp_processor_id(); #endif if (prev_mm == next_mm) return; #ifdef CONFIG_MPU if (prev_mm->context.page_rwx_mask == current_rwx_mask[cpu]) { flush_switched_cplbs(cpu); set_mask_dcplbs(next_mm->context.page_rwx_mask, cpu); } #endif #ifdef CONFIG_APP_STACK_L1 /* 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); #endif } #ifdef CONFIG_IPIPE #define lock_mm_switch(flags) flags = hard_local_irq_save_cond() #define unlock_mm_switch(flags) hard_local_irq_restore_cond(flags) #else #define lock_mm_switch(flags) do { (void)(flags); } while (0) #define unlock_mm_switch(flags) do { (void)(flags); } while (0) #endif /* CONFIG_IPIPE */ #ifdef CONFIG_MPU static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned long flags; lock_mm_switch(flags); __switch_mm(prev, next, tsk); unlock_mm_switch(flags); } 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; unsigned long idx; unsigned long bit; if (unlikely(addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE)) page = (addr - (ASYNC_BANK0_BASE - _ramend)) >> 12; else page = addr >> 12; idx = page >> 5; bit = 1 << (page & 31); if (flags & VM_READ) mask[idx] |= bit; else mask[idx] &= ~bit; mask += page_mask_nelts; if (flags & VM_WRITE) mask[idx] |= bit; else mask[idx] &= ~bit; mask += page_mask_nelts; if (flags & VM_EXEC) mask[idx] |= bit; else mask[idx] &= ~bit; } static inline void update_protections(struct mm_struct *mm) { unsigned int cpu = smp_processor_id(); if (mm->context.page_rwx_mask == current_rwx_mask[cpu]) { flush_switched_cplbs(cpu); set_mask_dcplbs(mm->context.page_rwx_mask, cpu); } } #else /* !CONFIG_MPU */ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { __switch_mm(prev, next, tsk); } #endif 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 destroy_context(struct mm_struct *mm) { struct sram_list_struct *tmp; #ifdef CONFIG_MPU unsigned int cpu = smp_processor_id(); #endif #ifdef CONFIG_APP_STACK_L1 if (current_l1_stack_save == mm->context.l1_stack_save) current_l1_stack_save = 0; if (mm->context.l1_stack_save) free_l1stack(); #endif 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[cpu] == mm->context.page_rwx_mask) current_rwx_mask[cpu] = NULL; free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order); #endif } #define ipipe_mm_switch_protect(flags) \ flags = hard_local_irq_save_cond() #define ipipe_mm_switch_unprotect(flags) \ hard_local_irq_restore_cond(flags) #endif
Name | Type | Size | Permission | Actions |
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Kbuild | File | 658 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 1.55 KB | 0644 |
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barrier.h | File | 2.55 KB | 0644 |
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bfin-global.h | File | 2.8 KB | 0644 |
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bfin-lq035q1.h | File | 868 B | 0644 |
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bfin5xx_spi.h | File | 2.07 KB | 0644 |
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bfin_can.h | File | 36.04 KB | 0644 |
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bfin_dma.h | File | 5.46 KB | 0644 |
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bfin_pfmon.h | File | 1.11 KB | 0644 |
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bfin_ppi.h | File | 9.01 KB | 0644 |
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bfin_sdh.h | File | 7.2 KB | 0644 |
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bfin_serial.h | File | 17.02 KB | 0644 |
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bfin_simple_timer.h | File | 949 B | 0644 |
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bfin_sport.h | File | 1.21 KB | 0644 |
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bfin_sport3.h | File | 5.47 KB | 0644 |
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bfin_twi.h | File | 6.25 KB | 0644 |
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bfin_watchdog.h | File | 696 B | 0644 |
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bfrom.h | File | 3.36 KB | 0644 |
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bitops.h | File | 3.45 KB | 0644 |
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blackfin.h | File | 1.55 KB | 0644 |
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bug.h | File | 1.49 KB | 0644 |
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cache.h | File | 1.47 KB | 0644 |
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cacheflush.h | File | 3.79 KB | 0644 |
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cdef_LPBlackfin.h | File | 18.93 KB | 0644 |
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checksum.h | File | 899 B | 0644 |
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clkdev.h | File | 318 B | 0644 |
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clocks.h | File | 1.66 KB | 0644 |
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cmpxchg.h | File | 3.2 KB | 0644 |
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context.S | File | 5.92 KB | 0644 |
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cplb.h | File | 4.86 KB | 0644 |
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cplbinit.h | File | 1.6 KB | 0644 |
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cpu.h | File | 443 B | 0644 |
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def_LPBlackfin.h | File | 28.6 KB | 0644 |
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delay.h | File | 917 B | 0644 |
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dma-mapping.h | File | 1.09 KB | 0644 |
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dma.h | File | 9.28 KB | 0644 |
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dpmc.h | File | 18.24 KB | 0644 |
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early_printk.h | File | 1.09 KB | 0644 |
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elf.h | File | 4.88 KB | 0644 |
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entry.h | File | 5.27 KB | 0644 |
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exec.h | File | 37 B | 0644 |
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fixed_code.h | File | 806 B | 0644 |
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flat.h | File | 1.41 KB | 0644 |
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ftrace.h | File | 1.37 KB | 0644 |
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gpio.h | File | 5.91 KB | 0644 |
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gptimers.h | File | 8.95 KB | 0644 |
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hardirq.h | File | 301 B | 0644 |
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io.h | File | 1.52 KB | 0644 |
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ipipe.h | File | 5.81 KB | 0644 |
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ipipe_base.h | File | 2.38 KB | 0644 |
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irq.h | File | 879 B | 0644 |
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irq_handler.h | File | 1.93 KB | 0644 |
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irqflags.h | File | 7.13 KB | 0644 |
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kgdb.h | File | 3.23 KB | 0644 |
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l1layout.h | File | 879 B | 0644 |
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linkage.h | File | 205 B | 0644 |
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mem_init.h | File | 13.1 KB | 0644 |
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mem_map.h | File | 1.73 KB | 0644 |
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mmu.h | File | 713 B | 0644 |
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mmu_context.h | File | 5.35 KB | 0644 |
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module.h | File | 410 B | 0644 |
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nand.h | File | 895 B | 0644 |
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nmi.h | File | 195 B | 0644 |
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page.h | File | 546 B | 0644 |
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page_offset.h | File | 192 B | 0644 |
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pci.h | File | 310 B | 0644 |
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pda.h | File | 1.86 KB | 0644 |
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perf_event.h | File | 23 B | 0644 |
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pgtable.h | File | 3 KB | 0644 |
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pm.h | File | 590 B | 0644 |
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portmux.h | File | 16.38 KB | 0644 |
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processor.h | File | 3.21 KB | 0644 |
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pseudo_instructions.h | File | 391 B | 0644 |
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ptrace.h | File | 1.19 KB | 0644 |
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reboot.h | File | 446 B | 0644 |
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rwlock.h | File | 142 B | 0644 |
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scb.h | File | 445 B | 0644 |
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sections.h | File | 2 KB | 0644 |
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segment.h | File | 226 B | 0644 |
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smp.h | File | 1.34 KB | 0644 |
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spinlock.h | File | 1.87 KB | 0644 |
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spinlock_types.h | File | 495 B | 0644 |
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string.h | File | 1.04 KB | 0644 |
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switch_to.h | File | 997 B | 0644 |
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syscall.h | File | 2.15 KB | 0644 |
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thread_info.h | File | 2.66 KB | 0644 |
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time.h | File | 1.33 KB | 0644 |
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timex.h | File | 477 B | 0644 |
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tlb.h | File | 481 B | 0644 |
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tlbflush.h | File | 88 B | 0644 |
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trace.h | File | 2.67 KB | 0644 |
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traps.h | File | 4.87 KB | 0644 |
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uaccess.h | File | 5.79 KB | 0644 |
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unistd.h | File | 523 B | 0644 |
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vga.h | File | 29 B | 0644 |
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