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#------------------------------------------------------------------------------
#
# Copyright (c) 2016, Linaro Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
#------------------------------------------------------------------------------
#include <AsmMacroIoLibV8.h>
.set CTRL_M_BIT, (1 << 0)
.macro __replace_entry, el
// check whether we should disable the MMU
cbz x3, .L1_\@
// clean and invalidate first so that we don't clobber
// adjacent entries that are dirty in the caches
dc civac, x0
dsb nsh
// disable the MMU
mrs x8, sctlr_el\el
bic x9, x8, #CTRL_M_BIT
msr sctlr_el\el, x9
isb
// write updated entry
str x1, [x0]
// invalidate again to get rid of stale clean cachelines that may
// have been filled speculatively since the last invalidate
dmb sy
dc ivac, x0
// flush translations for the target address from the TLBs
lsr x2, x2, #12
.if \el == 1
tlbi vaae1, x2
.else
tlbi vae\el, x2
.endif
dsb nsh
// re-enable the MMU
msr sctlr_el\el, x8
isb
b .L2_\@
.L1_\@:
// write invalid entry
str xzr, [x0]
dsb nshst
// flush translations for the target address from the TLBs
lsr x2, x2, #12
.if \el == 1
tlbi vaae1, x2
.else
tlbi vae\el, x2
.endif
dsb nsh
// write updated entry
str x1, [x0]
dsb nshst
.L2_\@:
.endm
//VOID
//ArmReplaceLiveTranslationEntry (
// IN UINT64 *Entry,
// IN UINT64 Value,
// IN UINT64 Address
// )
//
// Align this routine to a log2 upper bound of its size, so that it is
// guaranteed not to cross a page or block boundary.
ASM_FUNC_ALIGN(ArmReplaceLiveTranslationEntry, 0x200)
// disable interrupts
mrs x4, daif
msr daifset, #0xf
isb
EL1_OR_EL2_OR_EL3(x5)
1:__replace_entry 1
b 4f
2:__replace_entry 2
b 4f
3:__replace_entry 3
4:msr daif, x4
ret
ASM_GLOBAL ASM_PFX(ArmReplaceLiveTranslationEntrySize)
ASM_PFX(ArmReplaceLiveTranslationEntrySize):
.long . - ArmReplaceLiveTranslationEntry
// Double check that we did not overrun the assumed maximum size or cross a
// 0x200 boundary (and thus implicitly not any larger power of two, including
// the page size).
.balign 0x200
.org ArmReplaceLiveTranslationEntry + 0x200
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