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
19 #include "proc-macros.S"
48  * dcisw: Invalidate data cache by set/way
55  * dccisw: Clean and invalidate data cache by set/way
129 	and	r3, r1, r0, lsr #3      @ NumWays - 1
137 1:	sub	r2, r2, #1      @ NumSets--
139 2:	subs	r3, r3, #1      @ Temp--
144 	bgt	2b
155  *	Flush the whole I-cache.
158  *	r0 - set to 0
168  *	Flush the whole D-cache.
170  *	Corrupted registers: r0-r7, r9-r11
176 	ands	r3, r3, #7 << 1			@ extract LoC*2 from clidr
184 	cmp	r1, #2				@ see what cache we have at this level
185 	blt	skip				@ skip if no cache, or just i-cache
198 	ands	r4, r4, r1, lsr #3		@ find maximum number on the way size
199 	clz	r5, r4				@ find bit position of way size increment
206 	orr	r11, r10, r6			@ factor way and cache number into r11
209 	dccisw	r11, r6				@ clean/invalidate by set/way
212 	subs	r4, r4, #1			@ decrement the way
215 	add	r10, r10, #2			@ increment cache number
231  *  working outwards from L1 cache. This is done using Set/Way based cache
238 	stmfd	sp!, {r4-r7, r9-r11, lr}
241 	ldmfd	sp!, {r4-r7, r9-r11, lr}
250  *	- mm    - mm_struct describing address space
260  *	- start - start address (may not be aligned)
261  *	- end   - end address (exclusive, may not be aligned)
262  *	- flags	- vm_area_struct flags describing address space
265  *	- we have a VIPT cache.
279  *	- start   - virtual start address of region
280  *	- end     - virtual end address of region
283  *	- the Icache does not read data from the write buffer
295  *	- start   - virtual start address of region
296  *	- end     - virtual end address of region
299  *	- the Icache does not read data from the write buffer
319 2:
323 	blo	2b
338  *	- addr	- kernel address
339  *	- size	- region size
362  *	- start   - virtual start address of region
363  *	- end     - virtual end address of region
388  *	- start   - virtual start address of region
389  *	- end     - virtual end address of region
406  *	- start   - virtual start address of region
407  *	- end     - virtual end address of region
424  *	- start	- kernel virtual start address
425  *	- size	- size of region
426  *	- dir	- DMA direction
437  *	- start	- kernel virtual start address
438  *	- size	- size of region
439  *	- dir	- DMA direction
453 	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)