c4bce90ea2
Yes, you heard it right, they changed the PTE layout for SUN4V. Ho hum... This is the simple and inefficient way to support this. It'll get optimized, don't worry. Signed-off-by: David S. Miller <davem@davemloft.net>
104 lines
2.4 KiB
ArmAsm
104 lines
2.4 KiB
ArmAsm
/* clear_page.S: UltraSparc optimized clear page.
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*
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* Copyright (C) 1996, 1998, 1999, 2000, 2004 David S. Miller (davem@redhat.com)
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* Copyright (C) 1997 Jakub Jelinek (jakub@redhat.com)
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*/
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#include <asm/visasm.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/spitfire.h>
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#include <asm/head.h>
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/* What we used to do was lock a TLB entry into a specific
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* TLB slot, clear the page with interrupts disabled, then
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* restore the original TLB entry. This was great for
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* disturbing the TLB as little as possible, but it meant
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* we had to keep interrupts disabled for a long time.
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*
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* Now, we simply use the normal TLB loading mechanism,
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* and this makes the cpu choose a slot all by itself.
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* Then we do a normal TLB flush on exit. We need only
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* disable preemption during the clear.
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*/
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.text
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.globl _clear_page
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_clear_page: /* %o0=dest */
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ba,pt %xcc, clear_page_common
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clr %o4
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/* This thing is pretty important, it shows up
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* on the profiles via do_anonymous_page().
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*/
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.align 32
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.globl clear_user_page
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clear_user_page: /* %o0=dest, %o1=vaddr */
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lduw [%g6 + TI_PRE_COUNT], %o2
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sethi %uhi(PAGE_OFFSET), %g2
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sethi %hi(PAGE_SIZE), %o4
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sllx %g2, 32, %g2
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sethi %hi(PAGE_KERNEL_LOCKED), %g3
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ldx [%g3 + %lo(PAGE_KERNEL_LOCKED)], %g3
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sub %o0, %g2, %g1 ! paddr
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and %o1, %o4, %o0 ! vaddr D-cache alias bit
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or %g1, %g3, %g1 ! TTE data
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sethi %hi(TLBTEMP_BASE), %o3
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add %o2, 1, %o4
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add %o0, %o3, %o0 ! TTE vaddr
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/* Disable preemption. */
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mov TLB_TAG_ACCESS, %g3
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stw %o4, [%g6 + TI_PRE_COUNT]
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/* Load TLB entry. */
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rdpr %pstate, %o4
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wrpr %o4, PSTATE_IE, %pstate
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stxa %o0, [%g3] ASI_DMMU
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stxa %g1, [%g0] ASI_DTLB_DATA_IN
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sethi %hi(KERNBASE), %g1
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flush %g1
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wrpr %o4, 0x0, %pstate
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mov 1, %o4
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clear_page_common:
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VISEntryHalf
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membar #StoreLoad | #StoreStore | #LoadStore
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fzero %f0
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sethi %hi(PAGE_SIZE/64), %o1
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mov %o0, %g1 ! remember vaddr for tlbflush
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fzero %f2
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or %o1, %lo(PAGE_SIZE/64), %o1
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faddd %f0, %f2, %f4
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fmuld %f0, %f2, %f6
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faddd %f0, %f2, %f8
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fmuld %f0, %f2, %f10
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faddd %f0, %f2, %f12
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fmuld %f0, %f2, %f14
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1: stda %f0, [%o0 + %g0] ASI_BLK_P
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subcc %o1, 1, %o1
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bne,pt %icc, 1b
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add %o0, 0x40, %o0
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membar #Sync
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VISExitHalf
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brz,pn %o4, out
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nop
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stxa %g0, [%g1] ASI_DMMU_DEMAP
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membar #Sync
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stw %o2, [%g6 + TI_PRE_COUNT]
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out: retl
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nop
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