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/* $Id: mmu_context.h,v 1.17 1997/07/13 19:13:39 davem Exp $ */
#ifndef __SPARC64_MMU_CONTEXT_H
#define __SPARC64_MMU_CONTEXT_H
/* Derived heavily from Linus's Alpha/AXP ASN code... */
#include <asm/system.h>
#include <asm/spitfire.h>
#define NO_CONTEXT 0
#ifndef __ASSEMBLY__
#define destroy_context(mm) do { } while(0)
extern unsigned long tlb_context_cache;
#define CTX_VERSION_SHIFT PAGE_SHIFT
#define CTX_VERSION_MASK ((~0UL) << CTX_VERSION_SHIFT)
#define CTX_FIRST_VERSION ((1UL << CTX_VERSION_SHIFT) + 1UL)
extern void get_new_mmu_context(struct mm_struct *mm, unsigned long ctx);
/* Initialize the context related info for a new mm_struct
* instance.
*/
#define init_new_context(mm) get_new_mmu_context((mm), tlb_context_cache)
extern __inline__ void get_mmu_context(struct task_struct *tsk)
{
register unsigned long paddr asm("o5");
struct mm_struct *mm = tsk->mm;
flushw_user();
if(!(tsk->tss.flags & SPARC_FLAG_KTHREAD) &&
!(tsk->flags & PF_EXITING)) {
unsigned long ctx = tlb_context_cache;
if((mm->context ^ ctx) & CTX_VERSION_MASK)
get_new_mmu_context(mm, ctx);
/* Don't worry, set_fs() will restore it... */
tsk->tss.ctx = (tsk->tss.current_ds ?
(mm->context & 0x1fff) : 0);
} else
tsk->tss.ctx = 0;
spitfire_set_secondary_context(tsk->tss.ctx);
__asm__ __volatile__("flush %g6");
paddr = __pa(mm->pgd);
__asm__ __volatile__("
rdpr %%pstate, %%o4
wrpr %%o4, %1, %%pstate
mov %0, %%g7
wrpr %%o4, 0x0, %%pstate
" : /* no outputs */
: "r" (paddr), "i" (PSTATE_MG|PSTATE_IE)
: "o4");
}
#endif /* !(__ASSEMBLY__) */
#endif /* !(__SPARC64_MMU_CONTEXT_H) */
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