arm/mm/proc-arm920.S

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  *  linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
7  *  hacked for non-paged-MM by Hyok S. Choi, 2003.
12  *  CONFIG_CPU_ARM920_CPU_IDLE -> nohlt
20 #include <asm/pgtable-hwdef.h>
23 #include "proc-macros.S"
70  * Perform a soft reset of the system.  Put the CPU into the
74  * loc: location to jump to for soft reset
79 	mov	ip, #0
80 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
81 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
83 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
85 	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
86 	bic	ip, ip, #0x000f			@ ............wcam
87 	bic	ip, ip, #0x1100			@ ...i...s........
88 	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
130 	mov	ip, #0
132 	mov	r1, #(CACHE_DSEGMENTS - 1) << 5	@ 8 segments
133 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
140 	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
141 	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
151  *	- start	- start address (inclusive)
152  *	- end	- end address (exclusive)
153  *	- flags	- vm_flags for address space
156 	mov	ip, #0
168 	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
176  *	region described by start, end.  If you have non-snooping
179  *	- start	- virtual start address
180  *	- end	- virtual end address
192  *	region described by start, end.  If you have non-snooping
195  *	- start	- virtual start address
196  *	- end	- virtual end address
199 	bic	r0, r0, #CACHE_DLINESIZE - 1
216  *	- addr	- kernel address
217  *	- size	- region size
239  *	- start	- virtual start address
240  *	- end	- virtual end address
245 	tst	r0, #CACHE_DLINESIZE - 1
246 	bic	r0, r0, #CACHE_DLINESIZE - 1
248 	tst	r1, #CACHE_DLINESIZE - 1
262  *	- start	- virtual start address
263  *	- end	- virtual end address
268 	bic	r0, r0, #CACHE_DLINESIZE - 1
281  *	- start	- virtual start address
282  *	- end	- virtual end address
285 	bic	r0, r0, #CACHE_DLINESIZE - 1
296  *	- start	- kernel virtual start address
297  *	- size	- size of region
298  *	- dir	- DMA direction
310  *	- start	- kernel virtual start address
311  *	- size	- size of region
312  *	- dir	- DMA direction
341 	mov	ip, #0
343 	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
346 @ && Re-written to use Index Ops.
347 @ && Uses registers r1, r3 and ip
349 	mov	r1, #(CACHE_DSEGMENTS - 1) << 5	@ 8 segments
350 1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
357 	mcr	p15, 0, ip, c7, c5, 0		@ invalidate I cache
358 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
360 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
381 /* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */
386 	stmfd	sp!, {r4 - r6, lr}
390 	stmia	r0, {r4 - r6}
391 	ldmfd	sp!, {r4 - r6, pc}
395 	mov	ip, #0
396 	mcr	p15, 0, ip, c8, c7, 0	@ invalidate I+D TLBs
397 	mcr	p15, 0, ip, c7, c7, 0	@ invalidate I+D caches
398 	ldmia	r0, {r4 - r6}
421 	.size	__arm920_setup, . - __arm920_setup
434 	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
474 	.size	__arm920_proc_info, . - __arm920_proc_info