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/* $Id: mmu_context.h,v 1.8 1997/05/18 20:44:23 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__
/* Initialize the context related info for a new mm_struct
* instance.
*/
#define init_new_context(mm) ((mm)->context = NO_CONTEXT)
#define destroy_context(mm) do { } while(0)
extern unsigned long tlb_context_cache;
#define MAX_CTX PAGE_SIZE
#define CTX_VERSION_SHIFT PAGE_SHIFT
#define CTX_VERSION_MASK ((~0UL) << CTX_VERSION_SHIFT)
#define CTX_FIRST_VERSION ((1UL << CTX_VERSION_SHIFT) + 1UL)
extern __inline__ void get_new_mmu_context(struct mm_struct *mm,
unsigned long ctx)
{
if((ctx & ~CTX_VERSION_MASK) > MAX_CTX) {
unsigned long flags;
int entry;
save_and_cli(flags);
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"stxa %%g0, [%0] %2"
: /* No outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU),
"i" (ASI_DMMU));
for(entry = 0; entry < 62; entry++) {
spitfire_put_dtlb_data(entry, 0x0UL);
spitfire_put_itlb_data(entry, 0x0UL);
}
membar("#Sync");
flushi(PAGE_OFFSET);
restore_flags(flags);
ctx = (ctx & CTX_VERSION_MASK) + CTX_FIRST_VERSION;
if(!ctx)
ctx = CTX_FIRST_VERSION;
}
tlb_context_cache = ctx + 1;
mm->context = ctx;
}
extern __inline__ void get_mmu_context(struct task_struct *tsk)
{
struct mm_struct *mm = tsk->mm;
if(mm &&
!(tsk->tss.flags & SPARC_FLAG_KTHREAD) &&
!(tsk->flags & PF_EXITING)) {
unsigned long ctx = tlb_context_cache;
register unsigned long paddr asm("o5");
flushw_user();
if((mm->context ^ ctx) & CTX_VERSION_MASK)
get_new_mmu_context(mm, ctx);
spitfire_set_secondary_context(mm->context);
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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