diff options
Diffstat (limited to 'include/asm-sh/mmu_context.h')
| -rw-r--r-- | include/asm-sh/mmu_context.h | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/include/asm-sh/mmu_context.h b/include/asm-sh/mmu_context.h deleted file mode 100644 index 6760d064bd0..00000000000 --- a/include/asm-sh/mmu_context.h +++ /dev/null @@ -1,206 +0,0 @@ -/* - * Copyright (C) 1999 Niibe Yutaka - * Copyright (C) 2003 Paul Mundt - * - * ASID handling idea taken from MIPS implementation. - */ -#ifndef __ASM_SH_MMU_CONTEXT_H -#define __ASM_SH_MMU_CONTEXT_H -#ifdef __KERNEL__ - -#include <asm/cpu/mmu_context.h> -#include <asm/tlbflush.h> -#include <asm/pgalloc.h> -#include <asm/uaccess.h> -#include <asm/io.h> - -/* - * The MMU "context" consists of two things: - * (a) TLB cache version (or round, cycle whatever expression you like) - * (b) ASID (Address Space IDentifier) - */ - -/* - * Cache of MMU context last used. - */ -extern unsigned long mmu_context_cache; - -#define MMU_CONTEXT_ASID_MASK 0x000000ff -#define MMU_CONTEXT_VERSION_MASK 0xffffff00 -#define MMU_CONTEXT_FIRST_VERSION 0x00000100 -#define NO_CONTEXT 0 - -/* ASID is 8-bit value, so it can't be 0x100 */ -#define MMU_NO_ASID 0x100 - -/* - * Virtual Page Number mask - */ -#define MMU_VPN_MASK 0xfffff000 - -#ifdef CONFIG_MMU -/* - * Get MMU context if needed. - */ -static __inline__ void -get_mmu_context(struct mm_struct *mm) -{ - extern void flush_tlb_all(void); - unsigned long mc = mmu_context_cache; - - /* Check if we have old version of context. */ - if (((mm->context ^ mc) & MMU_CONTEXT_VERSION_MASK) == 0) - /* It's up to date, do nothing */ - return; - - /* It's old, we need to get new context with new version. */ - mc = ++mmu_context_cache; - if (!(mc & MMU_CONTEXT_ASID_MASK)) { - /* - * We exhaust ASID of this version. - * Flush all TLB and start new cycle. - */ - flush_tlb_all(); - /* - * Fix version; Note that we avoid version #0 - * to distingush NO_CONTEXT. - */ - if (!mc) - mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION; - } - mm->context = mc; -} - -/* - * Initialize the context related info for a new mm_struct - * instance. - */ -static __inline__ int init_new_context(struct task_struct *tsk, - struct mm_struct *mm) -{ - mm->context = NO_CONTEXT; - - return 0; -} - -/* - * Destroy context related info for an mm_struct that is about - * to be put to rest. - */ -static __inline__ void destroy_context(struct mm_struct *mm) -{ - /* Do nothing */ -} - -static __inline__ void set_asid(unsigned long asid) -{ - unsigned long __dummy; - - __asm__ __volatile__ ("mov.l %2, %0\n\t" - "and %3, %0\n\t" - "or %1, %0\n\t" - "mov.l %0, %2" - : "=&r" (__dummy) - : "r" (asid), "m" (__m(MMU_PTEH)), - "r" (0xffffff00)); -} - -static __inline__ unsigned long get_asid(void) -{ - unsigned long asid; - - __asm__ __volatile__ ("mov.l %1, %0" - : "=r" (asid) - : "m" (__m(MMU_PTEH))); - asid &= MMU_CONTEXT_ASID_MASK; - return asid; -} - -/* - * After we have set current->mm to a new value, this activates - * the context for the new mm so we see the new mappings. - */ -static __inline__ void activate_context(struct mm_struct *mm) -{ - get_mmu_context(mm); - set_asid(mm->context & MMU_CONTEXT_ASID_MASK); -} - -/* MMU_TTB can be used for optimizing the fault handling. - (Currently not used) */ -static __inline__ void switch_mm(struct mm_struct *prev, - struct mm_struct *next, - struct task_struct *tsk) -{ - if (likely(prev != next)) { - unsigned long __pgdir = (unsigned long)next->pgd; - - __asm__ __volatile__("mov.l %0, %1" - : /* no output */ - : "r" (__pgdir), "m" (__m(MMU_TTB))); - activate_context(next); - } -} - -#define deactivate_mm(tsk,mm) do { } while (0) - -#define activate_mm(prev, next) \ - switch_mm((prev),(next),NULL) - -static __inline__ void -enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) -{ -} -#else /* !CONFIG_MMU */ -#define get_mmu_context(mm) do { } while (0) -#define init_new_context(tsk,mm) (0) -#define destroy_context(mm) do { } while (0) -#define set_asid(asid) do { } while (0) -#define get_asid() (0) -#define activate_context(mm) do { } while (0) -#define switch_mm(prev,next,tsk) do { } while (0) -#define deactivate_mm(tsk,mm) do { } while (0) -#define activate_mm(prev,next) do { } while (0) -#define enter_lazy_tlb(mm,tsk) do { } while (0) -#endif /* CONFIG_MMU */ - -#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) -/* - * If this processor has an MMU, we need methods to turn it off/on .. - * paging_init() will also have to be updated for the processor in - * question. - */ -static inline void enable_mmu(void) -{ - /* Enable MMU */ - ctrl_outl(MMU_CONTROL_INIT, MMUCR); - - /* The manual suggests doing some nops after turning on the MMU */ - __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop\n\t"); - - if (mmu_context_cache == NO_CONTEXT) - mmu_context_cache = MMU_CONTEXT_FIRST_VERSION; - - set_asid(mmu_context_cache & MMU_CONTEXT_ASID_MASK); -} - -static inline void disable_mmu(void) -{ - unsigned long cr; - - cr = ctrl_inl(MMUCR); - cr &= ~MMU_CONTROL_INIT; - ctrl_outl(cr, MMUCR); - __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop\n\t"); -} -#else -/* - * MMU control handlers for processors lacking memory - * management hardware. - */ -#define enable_mmu() do { BUG(); } while (0) -#define disable_mmu() do { BUG(); } while (0) -#endif - -#endif /* __KERNEL__ */ -#endif /* __ASM_SH_MMU_CONTEXT_H */ |