arm/mm/cache-v7m.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  *  linux/arch/arm/mm/cache-v7m.S
5  *  Based on linux/arch/arm/mm/cache-v7.S
20 #include "proc-macros.S"
22 .arch armv7-m
51  * dcisw: Invalidate data cache by set/way
58  * dccisw: Clean and invalidate data cache by set/way
132 	and	r3, r1, r0, lsr #3      @ NumWays - 1
140 1:	sub	r2, r2, #1      @ NumSets--
142 2:	subs	r3, r3, #1      @ Temp--
147 	bgt	2b
158  *	Flush the whole I-cache.
161  *	r0 - set to 0
171  *	Flush the whole D-cache.
173  *	Corrupted registers: r0-r7, r9-r11
179 	ands	r3, r3, #7 << 1			@ extract LoC*2 from clidr
187 	cmp	r1, #2				@ see what cache we have at this level
188 	blt	skip				@ skip if no cache, or just i-cache
201 	ands	r4, r4, r1, lsr #3		@ find maximum number on the way size
202 	clz	r5, r4				@ find bit position of way size increment
209 	orr	r11, r10, r6			@ factor way and cache number into r11
212 	dccisw	r11, r6				@ clean/invalidate by set/way
215 	subs	r4, r4, #1			@ decrement the way
218 	add	r10, r10, #2			@ increment cache number
234  *  working outwards from L1 cache. This is done using Set/Way based cache
241 	stmfd	sp!, {r4-r7, r9-r11, lr}
244 	ldmfd	sp!, {r4-r7, r9-r11, lr}
253  *	- mm    - mm_struct describing address space
264  *	- start - start address (may not be aligned)
265  *	- end   - end address (exclusive, may not be aligned)
266  *	- flags	- vm_area_struct flags describing address space
269  *	- we have a VIPT cache.
282  *	- start   - virtual start address of region
283  *	- end     - virtual end address of region
286  *	- the Icache does not read data from the write buffer
301  *	- start   - virtual start address of region
302  *	- end     - virtual end address of region
305  *	- the Icache does not read data from the write buffer
325 2:
329 	blo	2b
343  *	- addr	- kernel address
344  *	- size	- region size
367  *	- start   - virtual start address of region
368  *	- end     - virtual end address of region
393  *	- start   - virtual start address of region
394  *	- end     - virtual end address of region
411  *	- start   - virtual start address of region
412  *	- end     - virtual end address of region
429  *	- start	- kernel virtual start address
430  *	- size	- size of region
431  *	- dir	- DMA direction
442  *	- start	- kernel virtual start address
443  *	- size	- size of region
444  *	- dir	- DMA direction