u-boot/arch/xtensa/include/asm/asmmacro.h
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

151 lines
2.7 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2005 - 2013 Tensilica Inc.
* Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
*/
#ifndef _XTENSA_ASMMACRO_H
#define _XTENSA_ASMMACRO_H
#include <asm/arch/core.h>
/*
* Function entry and return macros for supported ABIs.
*/
#if defined(__XTENSA_WINDOWED_ABI__)
#define abi_entry entry sp, 16
#define abi_ret retw
#elif defined(__XTENSA_CALL0_ABI__)
#define abi_entry
#define abi_ret ret
#else
#error Unsupported Xtensa ABI
#endif
/*
* Some little helpers for loops. Use zero-overhead-loops
* where applicable and if supported by the processor.
*
* __loopi ar, at, size, inc
* ar register initialized with the start address
* at scratch register used by macro
* size size immediate value
* inc increment
*
* __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
* ar register initialized with the start address
* as register initialized with the size
* at scratch register use by macro
* inc_log2 increment [in log2]
* mask_log2 mask [in log2]
* cond true condition (used in loop'cond')
* ncond false condition (used in b'ncond')
*
* __loop as
* restart loop. 'as' register must not have been modified!
*
* __endla ar, as, incr
* ar start address (modified)
* as scratch register used by __loops/__loopi macros or
* end address used by __loopt macro
* inc increment
*/
#if XCHAL_HAVE_LOOPS
.macro __loopi ar, at, size, incr
movi \at, ((\size + \incr - 1) / (\incr))
loop \at, 99f
.endm
.macro __loops ar, as, at, incr_log2, mask_log2, cond, ncond
.ifgt \incr_log2 - 1
addi \at, \as, (1 << \incr_log2) - 1
.ifnc \mask_log2,
extui \at, \at, \incr_log2, \mask_log2
.else
srli \at, \at, \incr_log2
.endif
.endif
loop\cond \at, 99f
.endm
.macro __loopt ar, as, at, incr_log2
sub \at, \as, \ar
.ifgt \incr_log2 - 1
addi \at, \at, (1 << \incr_log2) - 1
srli \at, \at, \incr_log2
.endif
loop \at, 99f
.endm
.macro __loop as
loop \as, 99f
.endm
.macro __endl ar, as
99:
.endm
#else
.macro __loopi ar, at, size, incr
movi \at, ((\size + \incr - 1) / (\incr))
addi \at, \ar, \size
98:
.endm
.macro __loops ar, as, at, incr_log2, mask_log2, cond, ncond
.ifnc \mask_log2,
extui \at, \as, \incr_log2, \mask_log2
.else
.ifnc \ncond,
srli \at, \as, \incr_log2
.endif
.endif
.ifnc \ncond,
b\ncond \at, 99f
.endif
.ifnc \mask_log2,
slli \at, \at, \incr_log2
add \at, \ar, \at
.else
add \at, \ar, \as
.endif
98:
.endm
.macro __loopt ar, as, at, incr_log2
98:
.endm
.macro __loop as
98:
.endm
.macro __endl ar, as
bltu \ar, \as, 98b
99:
.endm
#endif
.macro __endla ar, as, incr
addi \ar, \ar, \incr
__endl \ar \as
.endm
#endif /* _XTENSA_ASMMACRO_H */