diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TOOLCHAIN_GCC/TARGET_CORTEX_A/cache.s')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TOOLCHAIN_GCC/TARGET_CORTEX_A/cache.s | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TOOLCHAIN_GCC/TARGET_CORTEX_A/cache.s b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TOOLCHAIN_GCC/TARGET_CORTEX_A/cache.s new file mode 100644 index 000000000..d37f88919 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TOOLCHAIN_GCC/TARGET_CORTEX_A/cache.s @@ -0,0 +1,94 @@ +/* Copyright (c) 2009 - 2012 ARM LIMITED + + All rights reserved. + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + - Neither the name of ARM nor the names of its contributors may be used + to endorse or promote products derived from this software without + specific prior written permission. + * + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + ---------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- + * Functions + *---------------------------------------------------------------------------*/ + .text + .global __v7_all_cache +/* + * __STATIC_ASM void __v7_all_cache(uint32_t op) { + */ +__v7_all_cache: + .arm + + PUSH {R4-R11} + + MRC p15, 1, R6, c0, c0, 1 /* Read CLIDR */ + ANDS R3, R6, #0x07000000 /* Extract coherency level */ + MOV R3, R3, LSR #23 /* Total cache levels << 1 */ + BEQ Finished /* If 0, no need to clean */ + + MOV R10, #0 /* R10 holds current cache level << 1 */ +Loop1: ADD R2, R10, R10, LSR #1 /* R2 holds cache "Set" position */ + MOV R1, R6, LSR R2 /* Bottom 3 bits are the Cache-type for this level */ + AND R1, R1, #7 /* Isolate those lower 3 bits */ + CMP R1, #2 + BLT Skip /* No cache or only instruction cache at this level */ + + MCR p15, 2, R10, c0, c0, 0 /* Write the Cache Size selection register */ + ISB /* ISB to sync the change to the CacheSizeID reg */ + MRC p15, 1, R1, c0, c0, 0 /* Reads current Cache Size ID register */ + AND R2, R1, #7 /* Extract the line length field */ + ADD R2, R2, #4 /* Add 4 for the line length offset (log2 16 bytes) */ + LDR R4, =0x3FF + ANDS R4, R4, R1, LSR #3 /* R4 is the max number on the way size (right aligned) */ + CLZ R5, R4 /* R5 is the bit position of the way size increment */ + LDR R7, =0x7FFF + ANDS R7, R7, R1, LSR #13 /* R7 is the max number of the index size (right aligned) */ + +Loop2: MOV R9, R4 /* R9 working copy of the max way size (right aligned) */ + +Loop3: ORR R11, R10, R9, LSL R5 /* Factor in the Way number and cache number into R11 */ + ORR R11, R11, R7, LSL R2 /* Factor in the Set number */ + CMP R0, #0 + BNE Dccsw + MCR p15, 0, R11, c7, c6, 2 /* DCISW. Invalidate by Set/Way */ + B cont +Dccsw: CMP R0, #1 + BNE Dccisw + MCR p15, 0, R11, c7, c10, 2 /* DCCSW. Clean by Set/Way */ + B cont +Dccisw: MCR p15, 0, R11, c7, c14, 2 /* DCCISW, Clean and Invalidate by Set/Way */ +cont: SUBS R9, R9, #1 /* Decrement the Way number */ + BGE Loop3 + SUBS R7, R7, #1 /* Decrement the Set number */ + BGE Loop2 +Skip: ADD R10, R10, #2 /* increment the cache number */ + CMP R3, R10 + BGT Loop1 + +Finished: + DSB + POP {R4-R11} + BX lr + + + .END +/*---------------------------------------------------------------------------- + * end of file + *---------------------------------------------------------------------------*/ |