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https://github.com/edk2-porting/linux-next.git
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367b8112fe
Move all header files for xtensa to arch/xtensa/include and platform and variant header files to the appropriate arch/xtensa/platforms/ and arch/xtensa/variants/ directories. Moving the files gets also rid of all uses of symlinks in the Makefile. This has been completed already for the majority of the architectures and xtensa is one out of six missing. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Chris Zankel <chris@zankel.net>
154 lines
2.7 KiB
C
154 lines
2.7 KiB
C
/*
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* include/asm-xtensa/asmmacro.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_ASMMACRO_H
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#define _XTENSA_ASMMACRO_H
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#include <variant/core.h>
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/*
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* Some little helpers for loops. Use zero-overhead-loops
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* where applicable and if supported by the processor.
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*
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* __loopi ar, at, size, inc
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* ar register initialized with the start address
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* at scratch register used by macro
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* size size immediate value
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* inc increment
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*
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* __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
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* ar register initialized with the start address
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* as register initialized with the size
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* at scratch register use by macro
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* inc_log2 increment [in log2]
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* mask_log2 mask [in log2]
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* cond true condition (used in loop'cond')
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* ncond false condition (used in b'ncond')
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*
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* __loop as
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* restart loop. 'as' register must not have been modified!
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*
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* __endla ar, at, incr
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* ar start address (modified)
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* as scratch register used by macro
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* inc increment
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*/
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/*
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* loop for given size as immediate
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*/
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.macro __loopi ar, at, size, incr
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#if XCHAL_HAVE_LOOPS
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movi \at, ((\size + \incr - 1) / (\incr))
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loop \at, 99f
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#else
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addi \at, \ar, \size
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98:
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#endif
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.endm
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/*
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* loop for given size in register
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*/
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.macro __loops ar, as, at, incr_log2, mask_log2, cond, ncond
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#if XCHAL_HAVE_LOOPS
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.ifgt \incr_log2 - 1
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addi \at, \as, (1 << \incr_log2) - 1
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.ifnc \mask_log2,
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extui \at, \at, \incr_log2, \mask_log2
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.else
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srli \at, \at, \incr_log2
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.endif
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.endif
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loop\cond \at, 99f
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#else
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.ifnc \mask_log2,
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extui \at, \as, \incr_log2, \mask_log2
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.else
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.ifnc \ncond,
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srli \at, \as, \incr_log2
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.endif
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.endif
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.ifnc \ncond,
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b\ncond \at, 99f
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.endif
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.ifnc \mask_log2,
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slli \at, \at, \incr_log2
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add \at, \ar, \at
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.else
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add \at, \ar, \as
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.endif
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#endif
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98:
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.endm
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/*
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* loop from ar to ax
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*/
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.macro __loopt ar, as, at, incr_log2
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#if XCHAL_HAVE_LOOPS
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sub \at, \as, \ar
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.ifgt \incr_log2 - 1
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addi \at, \at, (1 << \incr_log2) - 1
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srli \at, \at, \incr_log2
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.endif
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loop \at, 99f
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#else
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98:
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#endif
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.endm
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/*
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* restart loop. registers must be unchanged
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*/
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.macro __loop as
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#if XCHAL_HAVE_LOOPS
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loop \as, 99f
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#else
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98:
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#endif
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.endm
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/*
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* end of loop with no increment of the address.
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*/
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.macro __endl ar, as
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#if !XCHAL_HAVE_LOOPS
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bltu \ar, \as, 98b
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#endif
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99:
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.endm
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/*
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* end of loop with increment of the address.
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*/
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.macro __endla ar, as, incr
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addi \ar, \ar, \incr
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__endl \ar \as
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.endm
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#endif /* _XTENSA_ASMMACRO_H */
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