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linux/arch/parisc/kernel/pacache.S
John David Anglin febe42964f parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm 
We have four routines in pacache.S that use temporary alias pages:
copy_user_page_asm(), clear_user_page_asm(), flush_dcache_page_asm() and
flush_icache_page_asm().  copy_user_page_asm() and clear_user_page_asm()
don't purge the TLB entry used for the operation.
flush_dcache_page_asm() and flush_icache_page_asm do purge the entry.

Presumably, this was thought to optimize TLB use.  However, the
operation is quite heavy weight on PA 1.X processors as we need to take
the TLB lock and a TLB broadcast is sent to all processors.

This patch removes the purges from flush_dcache_page_asm() and
flush_icache_page_asm.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org> # v3.16+
Signed-off-by: Helge Deller <deller@gmx.de>
2016-12-07 09:01:21 +01:00

1288 lines
30 KiB
ArmAsm
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/*
* PARISC TLB and cache flushing support
* Copyright (C) 2000-2001 Hewlett-Packard (John Marvin)
* Copyright (C) 2001 Matthew Wilcox (willy at parisc-linux.org)
* Copyright (C) 2002 Richard Hirst (rhirst with parisc-linux.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* NOTE: fdc,fic, and pdc instructions that use base register modification
* should only use index and base registers that are not shadowed,
* so that the fast path emulation in the non access miss handler
* can be used.
*/
#ifdef CONFIG_64BIT
.level 2.0w
#else
.level 2.0
#endif
#include <asm/psw.h>
#include <asm/assembly.h>
#include <asm/pgtable.h>
#include <asm/cache.h>
#include <linux/linkage.h>
.text
.align 128
ENTRY_CFI(flush_tlb_all_local)
.proc
.callinfo NO_CALLS
.entry
/*
* The pitlbe and pdtlbe instructions should only be used to
* flush the entire tlb. Also, there needs to be no intervening
* tlb operations, e.g. tlb misses, so the operation needs
* to happen in real mode with all interruptions disabled.
*/
/* pcxt_ssm_bug - relied upon translation! PA 2.0 Arch. F-4 and F-5 */
rsm PSW_SM_I, %r19 /* save I-bit state */
load32 PA(1f), %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q, %r0 /* prep to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 REAL_MODE_PSW, %r1
mtctl %r1, %ipsw
rfi
nop
1: load32 PA(cache_info), %r1
/* Flush Instruction Tlb */
LDREG ITLB_SID_BASE(%r1), %r20
LDREG ITLB_SID_STRIDE(%r1), %r21
LDREG ITLB_SID_COUNT(%r1), %r22
LDREG ITLB_OFF_BASE(%r1), %arg0
LDREG ITLB_OFF_STRIDE(%r1), %arg1
LDREG ITLB_OFF_COUNT(%r1), %arg2
LDREG ITLB_LOOP(%r1), %arg3
addib,COND(=) -1, %arg3, fitoneloop /* Preadjust and test */
movb,<,n %arg3, %r31, fitdone /* If loop < 0, skip */
copy %arg0, %r28 /* Init base addr */
fitmanyloop: /* Loop if LOOP >= 2 */
mtsp %r20, %sr1
add %r21, %r20, %r20 /* increment space */
copy %arg2, %r29 /* Init middle loop count */
fitmanymiddle: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fitmanymiddle /* Adjusted inner loop decr */
pitlbe %r0(%sr1, %r28)
pitlbe,m %arg1(%sr1, %r28) /* Last pitlbe and addr adjust */
addib,COND(>) -1, %r29, fitmanymiddle /* Middle loop decr */
copy %arg3, %r31 /* Re-init inner loop count */
movb,tr %arg0, %r28, fitmanyloop /* Re-init base addr */
addib,COND(<=),n -1, %r22, fitdone /* Outer loop count decr */
fitoneloop: /* Loop if LOOP = 1 */
mtsp %r20, %sr1
copy %arg0, %r28 /* init base addr */
copy %arg2, %r29 /* init middle loop count */
fitonemiddle: /* Loop if LOOP = 1 */
addib,COND(>) -1, %r29, fitonemiddle /* Middle loop count decr */
pitlbe,m %arg1(%sr1, %r28) /* pitlbe for one loop */
addib,COND(>) -1, %r22, fitoneloop /* Outer loop count decr */
add %r21, %r20, %r20 /* increment space */
fitdone:
/* Flush Data Tlb */
LDREG DTLB_SID_BASE(%r1), %r20
LDREG DTLB_SID_STRIDE(%r1), %r21
LDREG DTLB_SID_COUNT(%r1), %r22
LDREG DTLB_OFF_BASE(%r1), %arg0
LDREG DTLB_OFF_STRIDE(%r1), %arg1
LDREG DTLB_OFF_COUNT(%r1), %arg2
LDREG DTLB_LOOP(%r1), %arg3
addib,COND(=) -1, %arg3, fdtoneloop /* Preadjust and test */
movb,<,n %arg3, %r31, fdtdone /* If loop < 0, skip */
copy %arg0, %r28 /* Init base addr */
fdtmanyloop: /* Loop if LOOP >= 2 */
mtsp %r20, %sr1
add %r21, %r20, %r20 /* increment space */
copy %arg2, %r29 /* Init middle loop count */
fdtmanymiddle: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fdtmanymiddle /* Adjusted inner loop decr */
pdtlbe %r0(%sr1, %r28)
pdtlbe,m %arg1(%sr1, %r28) /* Last pdtlbe and addr adjust */
addib,COND(>) -1, %r29, fdtmanymiddle /* Middle loop decr */
copy %arg3, %r31 /* Re-init inner loop count */
movb,tr %arg0, %r28, fdtmanyloop /* Re-init base addr */
addib,COND(<=),n -1, %r22,fdtdone /* Outer loop count decr */
fdtoneloop: /* Loop if LOOP = 1 */
mtsp %r20, %sr1
copy %arg0, %r28 /* init base addr */
copy %arg2, %r29 /* init middle loop count */
fdtonemiddle: /* Loop if LOOP = 1 */
addib,COND(>) -1, %r29, fdtonemiddle /* Middle loop count decr */
pdtlbe,m %arg1(%sr1, %r28) /* pdtlbe for one loop */
addib,COND(>) -1, %r22, fdtoneloop /* Outer loop count decr */
add %r21, %r20, %r20 /* increment space */
fdtdone:
/*
* Switch back to virtual mode
*/
/* pcxt_ssm_bug */
rsm PSW_SM_I, %r0
load32 2f, %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q, %r0 /* prep to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 KERNEL_PSW, %r1
or %r1, %r19, %r1 /* I-bit to state on entry */
mtctl %r1, %ipsw /* restore I-bit (entire PSW) */
rfi
nop
2: bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_tlb_all_local)
.import cache_info,data
ENTRY_CFI(flush_instruction_cache_local)
.proc
.callinfo NO_CALLS
.entry
load32 cache_info, %r1
/* Flush Instruction Cache */
LDREG ICACHE_BASE(%r1), %arg0
LDREG ICACHE_STRIDE(%r1), %arg1
LDREG ICACHE_COUNT(%r1), %arg2
LDREG ICACHE_LOOP(%r1), %arg3
rsm PSW_SM_I, %r22 /* No mmgt ops during loop*/
mtsp %r0, %sr1
addib,COND(=) -1, %arg3, fioneloop /* Preadjust and test */
movb,<,n %arg3, %r31, fisync /* If loop < 0, do sync */
fimanyloop: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fimanyloop /* Adjusted inner loop decr */
fice %r0(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0) /* Last fice and addr adjust */
movb,tr %arg3, %r31, fimanyloop /* Re-init inner loop count */
addib,COND(<=),n -1, %arg2, fisync /* Outer loop decr */
fioneloop: /* Loop if LOOP = 1 */
/* Some implementations may flush with a single fice instruction */
cmpib,COND(>>=),n 15, %arg2, fioneloop2
fioneloop1:
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
fice,m %arg1(%sr1, %arg0)
addib,COND(>) -16, %arg2, fioneloop1
fice,m %arg1(%sr1, %arg0)
/* Check if done */
cmpb,COND(=),n %arg2, %r0, fisync /* Predict branch taken */
fioneloop2:
addib,COND(>) -1, %arg2, fioneloop2 /* Outer loop count decr */
fice,m %arg1(%sr1, %arg0) /* Fice for one loop */
fisync:
sync
mtsm %r22 /* restore I-bit */
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_instruction_cache_local)
.import cache_info, data
ENTRY_CFI(flush_data_cache_local)
.proc
.callinfo NO_CALLS
.entry
load32 cache_info, %r1
/* Flush Data Cache */
LDREG DCACHE_BASE(%r1), %arg0
LDREG DCACHE_STRIDE(%r1), %arg1
LDREG DCACHE_COUNT(%r1), %arg2
LDREG DCACHE_LOOP(%r1), %arg3
rsm PSW_SM_I, %r22 /* No mmgt ops during loop*/
mtsp %r0, %sr1
addib,COND(=) -1, %arg3, fdoneloop /* Preadjust and test */
movb,<,n %arg3, %r31, fdsync /* If loop < 0, do sync */
fdmanyloop: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fdmanyloop /* Adjusted inner loop decr */
fdce %r0(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0) /* Last fdce and addr adjust */
movb,tr %arg3, %r31, fdmanyloop /* Re-init inner loop count */
addib,COND(<=),n -1, %arg2, fdsync /* Outer loop decr */
fdoneloop: /* Loop if LOOP = 1 */
/* Some implementations may flush with a single fdce instruction */
cmpib,COND(>>=),n 15, %arg2, fdoneloop2
fdoneloop1:
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
fdce,m %arg1(%sr1, %arg0)
addib,COND(>) -16, %arg2, fdoneloop1
fdce,m %arg1(%sr1, %arg0)
/* Check if done */
cmpb,COND(=),n %arg2, %r0, fdsync /* Predict branch taken */
fdoneloop2:
addib,COND(>) -1, %arg2, fdoneloop2 /* Outer loop count decr */
fdce,m %arg1(%sr1, %arg0) /* Fdce for one loop */
fdsync:
syncdma
sync
mtsm %r22 /* restore I-bit */
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_data_cache_local)
.align 16
/* Macros to serialize TLB purge operations on SMP. */
.macro tlb_lock la,flags,tmp
#ifdef CONFIG_SMP
ldil L%pa_tlb_lock,%r1
ldo R%pa_tlb_lock(%r1),\la
rsm PSW_SM_I,\flags
1: LDCW 0(\la),\tmp
cmpib,<>,n 0,\tmp,3f
2: ldw 0(\la),\tmp
cmpb,<> %r0,\tmp,1b
nop
b,n 2b
3:
#endif
.endm
.macro tlb_unlock la,flags,tmp
#ifdef CONFIG_SMP
ldi 1,\tmp
stw \tmp,0(\la)
mtsm \flags
#endif
.endm
/* Clear page using kernel mapping. */
ENTRY_CFI(clear_page_asm)
.proc
.callinfo NO_CALLS
.entry
#ifdef CONFIG_64BIT
/* Unroll the loop. */
ldi (PAGE_SIZE / 128), %r1
1:
std %r0, 0(%r26)
std %r0, 8(%r26)
std %r0, 16(%r26)
std %r0, 24(%r26)
std %r0, 32(%r26)
std %r0, 40(%r26)
std %r0, 48(%r26)
std %r0, 56(%r26)
std %r0, 64(%r26)
std %r0, 72(%r26)
std %r0, 80(%r26)
std %r0, 88(%r26)
std %r0, 96(%r26)
std %r0, 104(%r26)
std %r0, 112(%r26)
std %r0, 120(%r26)
/* Note reverse branch hint for addib is taken. */
addib,COND(>),n -1, %r1, 1b
ldo 128(%r26), %r26
#else
/*
* Note that until (if) we start saving the full 64-bit register
* values on interrupt, we can't use std on a 32 bit kernel.
*/
ldi (PAGE_SIZE / 64), %r1
1:
stw %r0, 0(%r26)
stw %r0, 4(%r26)
stw %r0, 8(%r26)
stw %r0, 12(%r26)
stw %r0, 16(%r26)
stw %r0, 20(%r26)
stw %r0, 24(%r26)
stw %r0, 28(%r26)
stw %r0, 32(%r26)
stw %r0, 36(%r26)
stw %r0, 40(%r26)
stw %r0, 44(%r26)
stw %r0, 48(%r26)
stw %r0, 52(%r26)
stw %r0, 56(%r26)
stw %r0, 60(%r26)
addib,COND(>),n -1, %r1, 1b
ldo 64(%r26), %r26
#endif
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(clear_page_asm)
/* Copy page using kernel mapping. */
ENTRY_CFI(copy_page_asm)
.proc
.callinfo NO_CALLS
.entry
#ifdef CONFIG_64BIT
/* PA8x00 CPUs can consume 2 loads or 1 store per cycle.
* Unroll the loop by hand and arrange insn appropriately.
* Prefetch doesn't improve performance on rp3440.
* GCC probably can do this just as well...
*/
ldi (PAGE_SIZE / 128), %r1
1: ldd 0(%r25), %r19
ldd 8(%r25), %r20
ldd 16(%r25), %r21
ldd 24(%r25), %r22
std %r19, 0(%r26)
std %r20, 8(%r26)
ldd 32(%r25), %r19
ldd 40(%r25), %r20
std %r21, 16(%r26)
std %r22, 24(%r26)
ldd 48(%r25), %r21
ldd 56(%r25), %r22
std %r19, 32(%r26)
std %r20, 40(%r26)
ldd 64(%r25), %r19
ldd 72(%r25), %r20
std %r21, 48(%r26)
std %r22, 56(%r26)
ldd 80(%r25), %r21
ldd 88(%r25), %r22
std %r19, 64(%r26)
std %r20, 72(%r26)
ldd 96(%r25), %r19
ldd 104(%r25), %r20
std %r21, 80(%r26)
std %r22, 88(%r26)
ldd 112(%r25), %r21
ldd 120(%r25), %r22
ldo 128(%r25), %r25
std %r19, 96(%r26)
std %r20, 104(%r26)
std %r21, 112(%r26)
std %r22, 120(%r26)
/* Note reverse branch hint for addib is taken. */
addib,COND(>),n -1, %r1, 1b
ldo 128(%r26), %r26
#else
/*
* This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
* bundles (very restricted rules for bundling).
* Note that until (if) we start saving
* the full 64 bit register values on interrupt, we can't
* use ldd/std on a 32 bit kernel.
*/
ldw 0(%r25), %r19
ldi (PAGE_SIZE / 64), %r1
1:
ldw 4(%r25), %r20
ldw 8(%r25), %r21
ldw 12(%r25), %r22
stw %r19, 0(%r26)
stw %r20, 4(%r26)
stw %r21, 8(%r26)
stw %r22, 12(%r26)
ldw 16(%r25), %r19
ldw 20(%r25), %r20
ldw 24(%r25), %r21
ldw 28(%r25), %r22
stw %r19, 16(%r26)
stw %r20, 20(%r26)
stw %r21, 24(%r26)
stw %r22, 28(%r26)
ldw 32(%r25), %r19
ldw 36(%r25), %r20
ldw 40(%r25), %r21
ldw 44(%r25), %r22
stw %r19, 32(%r26)
stw %r20, 36(%r26)
stw %r21, 40(%r26)
stw %r22, 44(%r26)
ldw 48(%r25), %r19
ldw 52(%r25), %r20
ldw 56(%r25), %r21
ldw 60(%r25), %r22
stw %r19, 48(%r26)
stw %r20, 52(%r26)
ldo 64(%r25), %r25
stw %r21, 56(%r26)
stw %r22, 60(%r26)
ldo 64(%r26), %r26
addib,COND(>),n -1, %r1, 1b
ldw 0(%r25), %r19
#endif
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(copy_page_asm)
/*
* NOTE: Code in clear_user_page has a hard coded dependency on the
* maximum alias boundary being 4 Mb. We've been assured by the
* parisc chip designers that there will not ever be a parisc
* chip with a larger alias boundary (Never say never :-) ).
*
* Subtle: the dtlb miss handlers support the temp alias region by
* "knowing" that if a dtlb miss happens within the temp alias
* region it must have occurred while in clear_user_page. Since
* this routine makes use of processor local translations, we
* don't want to insert them into the kernel page table. Instead,
* we load up some general registers (they need to be registers
* which aren't shadowed) with the physical page numbers (preshifted
* for tlb insertion) needed to insert the translations. When we
* miss on the translation, the dtlb miss handler inserts the
* translation into the tlb using these values:
*
* %r26 physical page (shifted for tlb insert) of "to" translation
* %r23 physical page (shifted for tlb insert) of "from" translation
*/
/* Drop prot bits and convert to page addr for iitlbt and idtlbt */
#define PAGE_ADD_SHIFT (PAGE_SHIFT-12)
.macro convert_phys_for_tlb_insert20 phys
extrd,u \phys, 56-PAGE_ADD_SHIFT, 32-PAGE_ADD_SHIFT, \phys
#if _PAGE_SIZE_ENCODING_DEFAULT
depdi _PAGE_SIZE_ENCODING_DEFAULT, 63, (63-58), \phys
#endif
.endm
/*
* copy_user_page_asm() performs a page copy using mappings
* equivalent to the user page mappings. It can be used to
* implement copy_user_page() but unfortunately both the `from'
* and `to' pages need to be flushed through mappings equivalent
* to the user mappings after the copy because the kernel accesses
* the `from' page through the kmap kernel mapping and the `to'
* page needs to be flushed since code can be copied. As a
* result, this implementation is less efficient than the simpler
* copy using the kernel mapping. It only needs the `from' page
* to flushed via the user mapping. The kunmap routines handle
* the flushes needed for the kernel mapping.
*
* I'm still keeping this around because it may be possible to
* use it if more information is passed into copy_user_page().
* Have to do some measurements to see if it is worthwhile to
* lobby for such a change.
*
*/
ENTRY_CFI(copy_user_page_asm)
.proc
.callinfo NO_CALLS
.entry
/* Convert virtual `to' and `from' addresses to physical addresses.
Move `from' physical address to non shadowed register. */
ldil L%(__PAGE_OFFSET), %r1
sub %r26, %r1, %r26
sub %r25, %r1, %r23
ldil L%(TMPALIAS_MAP_START), %r28
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
#endif
convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
convert_phys_for_tlb_insert20 %r23 /* convert phys addr to tlb insert format */
depd %r24,63,22, %r28 /* Form aliased virtual address 'to' */
depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
copy %r28, %r29
depdi 1, 41,1, %r29 /* Form aliased virtual address 'from' */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
extrw,u %r23, 24,25, %r23 /* convert phys addr to tlb insert format */
depw %r24, 31,22, %r28 /* Form aliased virtual address 'to' */
depwi 0, 31,PAGE_SHIFT, %r28 /* Clear any offset bits */
copy %r28, %r29
depwi 1, 9,1, %r29 /* Form aliased virtual address 'from' */
#endif
/* Purge any old translations */
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
pdtlb,l %r0(%r29)
#else
tlb_lock %r20,%r21,%r22
pdtlb %r0(%r28)
pdtlb %r0(%r29)
tlb_unlock %r20,%r21,%r22
#endif
#ifdef CONFIG_64BIT
/* PA8x00 CPUs can consume 2 loads or 1 store per cycle.
* Unroll the loop by hand and arrange insn appropriately.
* GCC probably can do this just as well.
*/
ldd 0(%r29), %r19
ldi (PAGE_SIZE / 128), %r1
1: ldd 8(%r29), %r20
ldd 16(%r29), %r21
ldd 24(%r29), %r22
std %r19, 0(%r28)
std %r20, 8(%r28)
ldd 32(%r29), %r19
ldd 40(%r29), %r20
std %r21, 16(%r28)
std %r22, 24(%r28)
ldd 48(%r29), %r21
ldd 56(%r29), %r22
std %r19, 32(%r28)
std %r20, 40(%r28)
ldd 64(%r29), %r19
ldd 72(%r29), %r20
std %r21, 48(%r28)
std %r22, 56(%r28)
ldd 80(%r29), %r21
ldd 88(%r29), %r22
std %r19, 64(%r28)
std %r20, 72(%r28)
ldd 96(%r29), %r19
ldd 104(%r29), %r20
std %r21, 80(%r28)
std %r22, 88(%r28)
ldd 112(%r29), %r21
ldd 120(%r29), %r22
std %r19, 96(%r28)
std %r20, 104(%r28)
ldo 128(%r29), %r29
std %r21, 112(%r28)
std %r22, 120(%r28)
ldo 128(%r28), %r28
/* conditional branches nullify on forward taken branch, and on
* non-taken backward branch. Note that .+4 is a backwards branch.
* The ldd should only get executed if the branch is taken.
*/
addib,COND(>),n -1, %r1, 1b /* bundle 10 */
ldd 0(%r29), %r19 /* start next loads */
#else
ldi (PAGE_SIZE / 64), %r1
/*
* This loop is optimized for PCXL/PCXL2 ldw/ldw and stw/stw
* bundles (very restricted rules for bundling). It probably
* does OK on PCXU and better, but we could do better with
* ldd/std instructions. Note that until (if) we start saving
* the full 64 bit register values on interrupt, we can't
* use ldd/std on a 32 bit kernel.
*/
1: ldw 0(%r29), %r19
ldw 4(%r29), %r20
ldw 8(%r29), %r21
ldw 12(%r29), %r22
stw %r19, 0(%r28)
stw %r20, 4(%r28)
stw %r21, 8(%r28)
stw %r22, 12(%r28)
ldw 16(%r29), %r19
ldw 20(%r29), %r20
ldw 24(%r29), %r21
ldw 28(%r29), %r22
stw %r19, 16(%r28)
stw %r20, 20(%r28)
stw %r21, 24(%r28)
stw %r22, 28(%r28)
ldw 32(%r29), %r19
ldw 36(%r29), %r20
ldw 40(%r29), %r21
ldw 44(%r29), %r22
stw %r19, 32(%r28)
stw %r20, 36(%r28)
stw %r21, 40(%r28)
stw %r22, 44(%r28)
ldw 48(%r29), %r19
ldw 52(%r29), %r20
ldw 56(%r29), %r21
ldw 60(%r29), %r22
stw %r19, 48(%r28)
stw %r20, 52(%r28)
stw %r21, 56(%r28)
stw %r22, 60(%r28)
ldo 64(%r28), %r28
addib,COND(>) -1, %r1,1b
ldo 64(%r29), %r29
#endif
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(copy_user_page_asm)
ENTRY_CFI(clear_user_page_asm)
.proc
.callinfo NO_CALLS
.entry
tophys_r1 %r26
ldil L%(TMPALIAS_MAP_START), %r28
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
#endif
convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
depwi 0, 31,PAGE_SHIFT, %r28 /* Clear any offset bits */
#endif
/* Purge any old translation */
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
#else
tlb_lock %r20,%r21,%r22
pdtlb %r0(%r28)
tlb_unlock %r20,%r21,%r22
#endif
#ifdef CONFIG_64BIT
ldi (PAGE_SIZE / 128), %r1
/* PREFETCH (Write) has not (yet) been proven to help here */
/* #define PREFETCHW_OP ldd 256(%0), %r0 */
1: std %r0, 0(%r28)
std %r0, 8(%r28)
std %r0, 16(%r28)
std %r0, 24(%r28)
std %r0, 32(%r28)
std %r0, 40(%r28)
std %r0, 48(%r28)
std %r0, 56(%r28)
std %r0, 64(%r28)
std %r0, 72(%r28)
std %r0, 80(%r28)
std %r0, 88(%r28)
std %r0, 96(%r28)
std %r0, 104(%r28)
std %r0, 112(%r28)
std %r0, 120(%r28)
addib,COND(>) -1, %r1, 1b
ldo 128(%r28), %r28
#else /* ! CONFIG_64BIT */
ldi (PAGE_SIZE / 64), %r1
1: stw %r0, 0(%r28)
stw %r0, 4(%r28)
stw %r0, 8(%r28)
stw %r0, 12(%r28)
stw %r0, 16(%r28)
stw %r0, 20(%r28)
stw %r0, 24(%r28)
stw %r0, 28(%r28)
stw %r0, 32(%r28)
stw %r0, 36(%r28)
stw %r0, 40(%r28)
stw %r0, 44(%r28)
stw %r0, 48(%r28)
stw %r0, 52(%r28)
stw %r0, 56(%r28)
stw %r0, 60(%r28)
addib,COND(>) -1, %r1, 1b
ldo 64(%r28), %r28
#endif /* CONFIG_64BIT */
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(clear_user_page_asm)
ENTRY_CFI(flush_dcache_page_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%(TMPALIAS_MAP_START), %r28
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
#endif
convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
depwi 0, 31,PAGE_SHIFT, %r28 /* Clear any offset bits */
#endif
/* Purge any old translation */
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
#else
tlb_lock %r20,%r21,%r22
pdtlb %r0(%r28)
tlb_unlock %r20,%r21,%r22
#endif
ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), r31
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
#else
depwi,z 1, 31-PAGE_SHIFT,1, %r25
#endif
add %r28, %r25, %r25
sub %r25, r31, %r25
1: fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
cmpb,COND(<<) %r28, %r25,1b
fdc,m r31(%r28)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_dcache_page_asm)
ENTRY_CFI(flush_icache_page_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%(TMPALIAS_MAP_START), %r28
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
#endif
convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
depwi 0, 31,PAGE_SHIFT, %r28 /* Clear any offset bits */
#endif
/* Purge any old translation. Note that the FIC instruction
* may use either the instruction or data TLB. Given that we
* have a flat address space, it's not clear which TLB will be
* used. So, we purge both entries. */
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
pitlb,l %r0(%sr4,%r28)
#else
tlb_lock %r20,%r21,%r22
pdtlb %r0(%r28)
pitlb %r0(%sr4,%r28)
tlb_unlock %r20,%r21,%r22
#endif
ldil L%icache_stride, %r1
ldw R%icache_stride(%r1), %r31
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
#else
depwi,z 1, 31-PAGE_SHIFT,1, %r25
#endif
add %r28, %r25, %r25
sub %r25, %r31, %r25
/* fic only has the type 26 form on PA1.1, requiring an
* explicit space specification, so use %sr4 */
1: fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
fic,m %r31(%sr4,%r28)
cmpb,COND(<<) %r28, %r25,1b
fic,m %r31(%sr4,%r28)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_icache_page_asm)
ENTRY_CFI(flush_kernel_dcache_page_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
#else
depwi,z 1, 31-PAGE_SHIFT,1, %r25
#endif
add %r26, %r25, %r25
sub %r25, %r23, %r25
1: fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
fdc,m %r23(%r26)
cmpb,COND(<<) %r26, %r25,1b
fdc,m %r23(%r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_kernel_dcache_page_asm)
ENTRY_CFI(purge_kernel_dcache_page_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
#else
depwi,z 1, 31-PAGE_SHIFT,1, %r25
#endif
add %r26, %r25, %r25
sub %r25, %r23, %r25
1: pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
pdc,m %r23(%r26)
cmpb,COND(<<) %r26, %r25, 1b
pdc,m %r23(%r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(purge_kernel_dcache_page_asm)
ENTRY_CFI(flush_user_dcache_range_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
ldo -1(%r23), %r21
ANDCM %r26, %r21, %r26
1: cmpb,COND(<<),n %r26, %r25, 1b
fdc,m %r23(%sr3, %r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_user_dcache_range_asm)
ENTRY_CFI(flush_kernel_dcache_range_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
ldo -1(%r23), %r21
ANDCM %r26, %r21, %r26
1: cmpb,COND(<<),n %r26, %r25,1b
fdc,m %r23(%r26)
sync
syncdma
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_kernel_dcache_range_asm)
ENTRY_CFI(flush_user_icache_range_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%icache_stride, %r1
ldw R%icache_stride(%r1), %r23
ldo -1(%r23), %r21
ANDCM %r26, %r21, %r26
1: cmpb,COND(<<),n %r26, %r25,1b
fic,m %r23(%sr3, %r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_user_icache_range_asm)
ENTRY_CFI(flush_kernel_icache_page)
.proc
.callinfo NO_CALLS
.entry
ldil L%icache_stride, %r1
ldw R%icache_stride(%r1), %r23
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
#else
depwi,z 1, 31-PAGE_SHIFT,1, %r25
#endif
add %r26, %r25, %r25
sub %r25, %r23, %r25
1: fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
fic,m %r23(%sr4, %r26)
cmpb,COND(<<) %r26, %r25, 1b
fic,m %r23(%sr4, %r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_kernel_icache_page)
ENTRY_CFI(flush_kernel_icache_range_asm)
.proc
.callinfo NO_CALLS
.entry
ldil L%icache_stride, %r1
ldw R%icache_stride(%r1), %r23
ldo -1(%r23), %r21
ANDCM %r26, %r21, %r26
1: cmpb,COND(<<),n %r26, %r25, 1b
fic,m %r23(%sr4, %r26)
sync
bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(flush_kernel_icache_range_asm)
/* align should cover use of rfi in disable_sr_hashing_asm and
* srdis_done.
*/
.align 256
ENTRY_CFI(disable_sr_hashing_asm)
.proc
.callinfo NO_CALLS
.entry
/*
* Switch to real mode
*/
/* pcxt_ssm_bug */
rsm PSW_SM_I, %r0
load32 PA(1f), %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q, %r0 /* prep to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 REAL_MODE_PSW, %r1
mtctl %r1, %ipsw
rfi
nop
1: cmpib,=,n SRHASH_PCXST, %r26,srdis_pcxs
cmpib,=,n SRHASH_PCXL, %r26,srdis_pcxl
cmpib,=,n SRHASH_PA20, %r26,srdis_pa20
b,n srdis_done
srdis_pcxs:
/* Disable Space Register Hashing for PCXS,PCXT,PCXT' */
.word 0x141c1a00 /* mfdiag %dr0, %r28 */
.word 0x141c1a00 /* must issue twice */
depwi 0,18,1, %r28 /* Clear DHE (dcache hash enable) */
depwi 0,20,1, %r28 /* Clear IHE (icache hash enable) */
.word 0x141c1600 /* mtdiag %r28, %dr0 */
.word 0x141c1600 /* must issue twice */
b,n srdis_done
srdis_pcxl:
/* Disable Space Register Hashing for PCXL */
.word 0x141c0600 /* mfdiag %dr0, %r28 */
depwi 0,28,2, %r28 /* Clear DHASH_EN & IHASH_EN */
.word 0x141c0240 /* mtdiag %r28, %dr0 */
b,n srdis_done
srdis_pa20:
/* Disable Space Register Hashing for PCXU,PCXU+,PCXW,PCXW+,PCXW2 */
.word 0x144008bc /* mfdiag %dr2, %r28 */
depdi 0, 54,1, %r28 /* clear DIAG_SPHASH_ENAB (bit 54) */
.word 0x145c1840 /* mtdiag %r28, %dr2 */
srdis_done:
/* Switch back to virtual mode */
rsm PSW_SM_I, %r0 /* prep to load iia queue */
load32 2f, %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q, %r0 /* prep to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 KERNEL_PSW, %r1
mtctl %r1, %ipsw
rfi
nop
2: bv %r0(%r2)
nop
.exit
.procend
ENDPROC_CFI(disable_sr_hashing_asm)
.end
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