blob: a73668a5f30d339a5b0513ac234536d1206caaa7 [file] [log] [blame]
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <asm/mmu.h>
#include <asm/cputable.h>
#include <asm-generic/mm_hooks.h>
#include <asm/cputhreads.h>
* Most if the context management is out of line
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
extern void set_context(unsigned long id, pgd_t *pgd);
extern int __init_new_context(void);
extern void __destroy_context(int context_id);
static inline void mmu_context_init(void) { }
extern unsigned long __init_new_context(void);
extern void __destroy_context(unsigned long context_id);
extern void mmu_context_init(void);
extern void switch_cop(struct mm_struct *next);
extern int use_cop(unsigned long acop, struct mm_struct *mm);
extern void drop_cop(unsigned long acop, struct mm_struct *mm);
* switch_mm is the entry point called from the architecture independent
* code in kernel/sched.c
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
/* Mark this context has been used on the new CPU */
cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
/* 32-bit keeps track of the current PGDIR in the thread struct */
#ifdef CONFIG_PPC32
tsk->thread.pgdir = next->pgd;
#endif /* CONFIG_PPC32 */
/* 64-bit Book3E keeps track of current PGD in the PACA */
get_paca()->pgd = next->pgd;
/* Nothing else to do if we aren't actually switching */
if (prev == next)
/* Switch coprocessor context only if prev or next uses a coprocessor */
if (prev->context.acop || next->context.acop)
#endif /* CONFIG_PPC_ICSWX */
/* We must stop all altivec streams before changing the HW
* context
if (cpu_has_feature(CPU_FTR_ALTIVEC))
asm volatile ("dssall");
#endif /* CONFIG_ALTIVEC */
/* The actual HW switching method differs between the various
* sub architectures.
if (mmu_has_feature(MMU_FTR_SLB))
switch_slb(tsk, next);
switch_stab(tsk, next);
/* Out of line for now */
switch_mmu_context(prev, next);
#define deactivate_mm(tsk,mm) do { } while (0)
* 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_mm(struct mm_struct *prev, struct mm_struct *next)
unsigned long flags;
switch_mm(prev, next, current);
/* We don't currently use enter_lazy_tlb() for anything */
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
/* 64-bit Book3E keeps track of current PGD in the PACA */
get_paca()->pgd = NULL;
#endif /* __KERNEL__ */