diff options
Diffstat (limited to 'include/asm-ppc/mmu_context.h')
| -rw-r--r-- | include/asm-ppc/mmu_context.h | 42 |
1 files changed, 29 insertions, 13 deletions
diff --git a/include/asm-ppc/mmu_context.h b/include/asm-ppc/mmu_context.h index 50fa27081..a7e0a5246 100644 --- a/include/asm-ppc/mmu_context.h +++ b/include/asm-ppc/mmu_context.h @@ -20,15 +20,15 @@ */ #ifdef CONFIG_8xx -#define NO_CONTEXT 16 -#define LAST_CONTEXT 15 +#define NO_CONTEXT 16 +#define LAST_CONTEXT 15 #define MUNGE_CONTEXT(n) (n) #else /* PPC 6xx, 7xx CPUs */ -#define NO_CONTEXT 0 -#define LAST_CONTEXT 0xfffff +#define NO_CONTEXT 0 +#define LAST_CONTEXT 0xfffff /* * Allocating context numbers this way tends to spread out @@ -41,18 +41,25 @@ extern atomic_t next_mmu_context; extern void mmu_context_overflow(void); -#ifndef CONFIG_8xx +/* + * Set the current MMU context. + * On 32-bit PowerPCs (other than the 8xx embedded chips), this is done by + * loading up the segment registers for the user part of the address space. + */ extern void set_context(int context); -#else -#define set_context(context) do { } while (0) + +#ifdef CONFIG_8xx +extern inline void mmu_context_overflow(void) +{ + atomic_set(&next_mmu_context, -1); +} #endif /* * Get a new mmu context for task tsk if necessary. */ -#define get_mmu_context(tsk) \ +#define get_mmu_context(mm) \ do { \ - struct mm_struct *mm = (tsk)->mm; \ if (mm->context == NO_CONTEXT) { \ if (atomic_read(&next_mmu_context) == LAST_CONTEXT) \ mmu_context_overflow(); \ @@ -63,21 +70,30 @@ do { \ /* * Set up the context for a new address space. */ -#define init_new_context(mm) ((mm)->context = NO_CONTEXT) +#define init_new_context(tsk,mm) ((mm)->context = NO_CONTEXT) /* * We're finished using the context for an address space. */ #define destroy_context(mm) do { } while (0) +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, + struct task_struct *tsk, int cpu) +{ + tsk->thread.pgdir = next->pgd; + get_mmu_context(next); + set_context(next->context); +} + /* * After we have set current->mm to a new value, this activates * the context for the new mm so we see the new mappings. */ -extern inline void activate_context(struct task_struct *tsk) +static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm) { - get_mmu_context(tsk); - set_context(tsk->mm->context); + current->thread.pgdir = mm->pgd; + get_mmu_context(mm); + set_context(mm->context); } /* |