-#ifndef __SPARC64_MMU_CONTEXT_H
-#define __SPARC64_MMU_CONTEXT_H
-
-/* Derived heavily from Linus's Alpha/AXP ASN code... */
-
-#ifndef __ASSEMBLY__
-
-#include <linux/spinlock.h>
-#include <asm/system.h>
-#include <asm/spitfire.h>
-#include <asm-generic/mm_hooks.h>
-
-static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
-{
-}
-
-extern spinlock_t ctx_alloc_lock;
-extern unsigned long tlb_context_cache;
-extern unsigned long mmu_context_bmap[];
-
-extern void get_new_mmu_context(struct mm_struct *mm);
-#ifdef CONFIG_SMP
-extern void smp_new_mmu_context_version(void);
-#else
-#define smp_new_mmu_context_version() do { } while (0)
-#endif
-
-extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
-extern void destroy_context(struct mm_struct *mm);
-
-extern void __tsb_context_switch(unsigned long pgd_pa,
- struct tsb_config *tsb_base,
- struct tsb_config *tsb_huge,
- unsigned long tsb_descr_pa);
-
-static inline void tsb_context_switch(struct mm_struct *mm)
-{
- __tsb_context_switch(__pa(mm->pgd),
- &mm->context.tsb_block[0],
-#ifdef CONFIG_HUGETLB_PAGE
- (mm->context.tsb_block[1].tsb ?
- &mm->context.tsb_block[1] :
- NULL)
-#else
- NULL
-#endif
- , __pa(&mm->context.tsb_descr[0]));
-}
-
-extern void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long mm_rss);
-#ifdef CONFIG_SMP
-extern void smp_tsb_sync(struct mm_struct *mm);
-#else
-#define smp_tsb_sync(__mm) do { } while (0)
-#endif
-
-/* Set MMU context in the actual hardware. */
-#define load_secondary_context(__mm) \
- __asm__ __volatile__( \
- "\n661: stxa %0, [%1] %2\n" \
- " .section .sun4v_1insn_patch, \"ax\"\n" \
- " .word 661b\n" \
- " stxa %0, [%1] %3\n" \
- " .previous\n" \
- " flush %%g6\n" \
- : /* No outputs */ \
- : "r" (CTX_HWBITS((__mm)->context)), \
- "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU), "i" (ASI_MMU))
-
-extern void __flush_tlb_mm(unsigned long, unsigned long);
-
-/* Switch the current MM context. Interrupts are disabled. */
-static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk)
-{
- unsigned long ctx_valid, flags;
- int cpu;
-
- if (unlikely(mm == &init_mm))
- return;
-
- spin_lock_irqsave(&mm->context.lock, flags);
- ctx_valid = CTX_VALID(mm->context);
- if (!ctx_valid)
- get_new_mmu_context(mm);
-
- /* We have to be extremely careful here or else we will miss
- * a TSB grow if we switch back and forth between a kernel
- * thread and an address space which has it's TSB size increased
- * on another processor.
- *
- * It is possible to play some games in order to optimize the
- * switch, but the safest thing to do is to unconditionally
- * perform the secondary context load and the TSB context switch.
- *
- * For reference the bad case is, for address space "A":
- *
- * CPU 0 CPU 1
- * run address space A
- * set cpu0's bits in cpu_vm_mask
- * switch to kernel thread, borrow
- * address space A via entry_lazy_tlb
- * run address space A
- * set cpu1's bit in cpu_vm_mask
- * flush_tlb_pending()
- * reset cpu_vm_mask to just cpu1
- * TSB grow
- * run address space A
- * context was valid, so skip
- * TSB context switch
- *
- * At that point cpu0 continues to use a stale TSB, the one from
- * before the TSB grow performed on cpu1. cpu1 did not cross-call
- * cpu0 to update it's TSB because at that point the cpu_vm_mask
- * only had cpu1 set in it.
- */
- load_secondary_context(mm);
- tsb_context_switch(mm);
-
- /* Any time a processor runs a context on an address space
- * for the first time, we must flush that context out of the
- * local TLB.
- */
- cpu = smp_processor_id();
- if (!ctx_valid || !cpu_isset(cpu, mm->cpu_vm_mask)) {
- cpu_set(cpu, mm->cpu_vm_mask);
- __flush_tlb_mm(CTX_HWBITS(mm->context),
- SECONDARY_CONTEXT);
- }
- spin_unlock_irqrestore(&mm->context.lock, flags);
-}
-
-#define deactivate_mm(tsk,mm) do { } while (0)
-
-/* Activate a new MM instance for the current task. */
-static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm)
-{
- unsigned long flags;
- int cpu;
-
- spin_lock_irqsave(&mm->context.lock, flags);
- if (!CTX_VALID(mm->context))
- get_new_mmu_context(mm);
- cpu = smp_processor_id();
- if (!cpu_isset(cpu, mm->cpu_vm_mask))
- cpu_set(cpu, mm->cpu_vm_mask);
-
- load_secondary_context(mm);
- __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
- tsb_context_switch(mm);
- spin_unlock_irqrestore(&mm->context.lock, flags);
-}
-
-#endif /* !(__ASSEMBLY__) */
-
-#endif /* !(__SPARC64_MMU_CONTEXT_H) */
+#include <asm-sparc/mmu_context.h>
git.openpandora.org / pandora-kernel.git / blobdiff