diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-02-04 14:54:56 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-02-04 14:54:56 +0100 |
commit | bb960a1e42042e82447a5bc0941b3ab6d614bac3 (patch) | |
tree | d2295a923fabb1b01b25bb015c4c2e42ee9df5ca /arch/m68k/include/asm/mmu_context_mm.h | |
parent | 858770619debfb9269add63e4ba8b7c6b5538dd1 (diff) | |
parent | 06fc732c33a7ff5e4c91bcf4a6ca86b5e335ad9a (diff) |
Merge branch 'core/xen' into x86/urgent
Diffstat (limited to 'arch/m68k/include/asm/mmu_context_mm.h')
-rw-r--r-- | arch/m68k/include/asm/mmu_context_mm.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/mmu_context_mm.h b/arch/m68k/include/asm/mmu_context_mm.h new file mode 100644 index 000000000000..894dacbcee14 --- /dev/null +++ b/arch/m68k/include/asm/mmu_context_mm.h @@ -0,0 +1,154 @@ +#ifndef __M68K_MMU_CONTEXT_H +#define __M68K_MMU_CONTEXT_H + +#include <asm-generic/mm_hooks.h> + +static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) +{ +} + +#ifndef CONFIG_SUN3 + +#include <asm/setup.h> +#include <asm/page.h> +#include <asm/pgalloc.h> + +static inline int init_new_context(struct task_struct *tsk, + struct mm_struct *mm) +{ + mm->context = virt_to_phys(mm->pgd); + return 0; +} + +#define destroy_context(mm) do { } while(0) + +static inline void switch_mm_0230(struct mm_struct *mm) +{ + unsigned long crp[2] = { + 0x80000000 | _PAGE_TABLE, mm->context + }; + unsigned long tmp; + + asm volatile (".chip 68030"); + + /* flush MC68030/MC68020 caches (they are virtually addressed) */ + asm volatile ( + "movec %%cacr,%0;" + "orw %1,%0; " + "movec %0,%%cacr" + : "=d" (tmp) : "di" (FLUSH_I_AND_D)); + + /* Switch the root pointer. For a 030-only kernel, + * avoid flushing the whole ATC, we only need to + * flush the user entries. The 68851 does this by + * itself. Avoid a runtime check here. + */ + asm volatile ( +#ifdef CPU_M68030_ONLY + "pmovefd %0,%%crp; " + "pflush #0,#4" +#else + "pmove %0,%%crp" +#endif + : : "m" (crp[0])); + + asm volatile (".chip 68k"); +} + +static inline void switch_mm_0460(struct mm_struct *mm) +{ + asm volatile (".chip 68040"); + + /* flush address translation cache (user entries) */ + asm volatile ("pflushan"); + + /* switch the root pointer */ + asm volatile ("movec %0,%%urp" : : "r" (mm->context)); + + if (CPU_IS_060) { + unsigned long tmp; + + /* clear user entries in the branch cache */ + asm volatile ( + "movec %%cacr,%0; " + "orl %1,%0; " + "movec %0,%%cacr" + : "=d" (tmp): "di" (0x00200000)); + } + + asm volatile (".chip 68k"); +} + +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) +{ + if (prev != next) { + if (CPU_IS_020_OR_030) + switch_mm_0230(next); + else + switch_mm_0460(next); + } +} + +#define deactivate_mm(tsk,mm) do { } while (0) + +static inline void activate_mm(struct mm_struct *prev_mm, + struct mm_struct *next_mm) +{ + next_mm->context = virt_to_phys(next_mm->pgd); + + if (CPU_IS_020_OR_030) + switch_mm_0230(next_mm); + else + switch_mm_0460(next_mm); +} + +#else /* CONFIG_SUN3 */ +#include <asm/sun3mmu.h> +#include <linux/sched.h> + +extern unsigned long get_free_context(struct mm_struct *mm); +extern void clear_context(unsigned long context); + +/* set the context for a new task to unmapped */ +static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) +{ + mm->context = SUN3_INVALID_CONTEXT; + return 0; +} + +/* find the context given to this process, and if it hasn't already + got one, go get one for it. */ +static inline void get_mmu_context(struct mm_struct *mm) +{ + if(mm->context == SUN3_INVALID_CONTEXT) + mm->context = get_free_context(mm); +} + +/* flush context if allocated... */ +static inline void destroy_context(struct mm_struct *mm) +{ + if(mm->context != SUN3_INVALID_CONTEXT) + clear_context(mm->context); +} + +static inline void activate_context(struct mm_struct *mm) +{ + get_mmu_context(mm); + sun3_put_context(mm->context); +} + +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) +{ + activate_context(tsk->mm); +} + +#define deactivate_mm(tsk,mm) do { } while (0) + +static inline void activate_mm(struct mm_struct *prev_mm, + struct mm_struct *next_mm) +{ + activate_context(next_mm); +} + +#endif +#endif |