1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/cache-v7.S
5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 * Copyright (C) 2005 ARM Ltd.
8 * This is the "shell" of the ARMv7 processor support.
10 #include <linux/linkage.h>
11 #include <linux/init.h>
12 #include <asm/assembler.h>
13 #include <asm/errno.h>
14 #include <asm/unwind.h>
15 #include <asm/hardware/cache-b15-rac.h>
17 #include "proc-macros.S"
19 #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
28 * The secondary kernel init calls v7_flush_dcache_all before it enables
29 * the L1; however, the L1 comes out of reset in an undefined state, so
30 * the clean + invalidate performed by v7_flush_dcache_all causes a bunch
31 * of cache lines with uninitialized data and uninitialized tags to get
32 * written out to memory, which does really unpleasant things to the main
33 * processor. We fix this by performing an invalidate, rather than a
34 * clean + invalidate, before jumping into the kernel.
36 * This function needs to be called for both secondary cores startup and
37 * primary core resume procedures.
39 ENTRY(v7_invalidate_l1)
41 mcr p15, 2, r0, c0, c0, 0 @ select L1 data cache in CSSELR
43 mrc p15, 1, r0, c0, c0, 0 @ read cache geometry from CCSIDR
46 and r3, r3, r0, lsr #3 @ 'Associativity' in CCSIDR[12:3]
49 mov r3, r3, lsl r1 @ NumWays-1 shifted into bits [31:...]
50 movs r1, r2, lsl r1 @ #1 shifted left by same amount
51 moveq r1, #1 @ r1 needs value > 0 even if only 1 way
54 add r2, r2, #4 @ SetShift
57 and r0, ip, r0, lsr #13 @ 'NumSets' in CCSIDR[27:13]
59 2: mov ip, r0, lsl r2 @ NumSet << SetShift
60 orr ip, ip, r3 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
61 mcr p15, 0, ip, c7, c6, 2
62 subs r0, r0, #1 @ Set--
64 subs r3, r3, r1 @ Way--
66 mrc p15, 1, r0, c0, c0, 0 @ re-read cache geometry from CCSIDR
71 ENDPROC(v7_invalidate_l1)
74 * v7_flush_icache_all()
76 * Flush the whole I-cache.
81 ENTRY(v7_flush_icache_all)
83 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
84 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
86 ENDPROC(v7_flush_icache_all)
89 * v7_flush_dcache_louis()
91 * Flush the D-cache up to the Level of Unification Inner Shareable
93 * Corrupted registers: r0-r6, r9-r10
96 ENTRY(v7_flush_dcache_louis)
97 dmb @ ensure ordering with previous memory accesses
98 mrc p15, 1, r0, c0, c0, 1 @ read clidr, r0 = clidr
99 ALT_SMP(mov r3, r0, lsr #20) @ move LoUIS into position
100 ALT_UP( mov r3, r0, lsr #26) @ move LoUU into position
101 ands r3, r3, #7 << 1 @ extract LoU*2 field from clidr
102 bne start_flush_levels @ LoU != 0, start flushing
103 #ifdef CONFIG_ARM_ERRATA_643719
104 ALT_SMP(mrc p15, 0, r2, c0, c0, 0) @ read main ID register
105 ALT_UP( ret lr) @ LoUU is zero, so nothing to do
106 movw r1, #:lower16:(0x410fc090 >> 4) @ ID of ARM Cortex A9 r0p?
107 movt r1, #:upper16:(0x410fc090 >> 4)
108 teq r1, r2, lsr #4 @ test for errata affected core and if so...
109 moveq r3, #1 << 1 @ fix LoUIS value
110 beq start_flush_levels @ start flushing cache levels
113 ENDPROC(v7_flush_dcache_louis)
116 * v7_flush_dcache_all()
118 * Flush the whole D-cache.
120 * Corrupted registers: r0-r6, r9-r10
122 * - mm - mm_struct describing address space
124 ENTRY(v7_flush_dcache_all)
125 dmb @ ensure ordering with previous memory accesses
126 mrc p15, 1, r0, c0, c0, 1 @ read clidr
127 mov r3, r0, lsr #23 @ move LoC into position
128 ands r3, r3, #7 << 1 @ extract LoC*2 from clidr
129 beq finished @ if loc is 0, then no need to clean
131 mov r10, #0 @ start clean at cache level 0
133 add r2, r10, r10, lsr #1 @ work out 3x current cache level
134 mov r1, r0, lsr r2 @ extract cache type bits from clidr
135 and r1, r1, #7 @ mask of the bits for current cache only
136 cmp r1, #2 @ see what cache we have at this level
137 blt skip @ skip if no cache, or just i-cache
138 #ifdef CONFIG_PREEMPTION
139 save_and_disable_irqs_notrace r9 @ make cssr&csidr read atomic
141 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
142 isb @ isb to sych the new cssr&csidr
143 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
144 #ifdef CONFIG_PREEMPTION
145 restore_irqs_notrace r9
147 and r2, r1, #7 @ extract the length of the cache lines
148 add r2, r2, #4 @ add 4 (line length offset)
150 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
151 clz r5, r4 @ find bit position of way size increment
153 and r1, r6, r1, lsr #13 @ extract max number of the index size
155 movne r4, r4, lsl r5 @ # of ways shifted into bits [31:...]
156 movne r6, r6, lsl r5 @ 1 shifted left by same amount
158 mov r9, r1 @ create working copy of max index
160 mov r5, r9, lsl r2 @ factor set number into r5
161 orr r5, r5, r4 @ factor way number into r5
162 orr r5, r5, r10 @ factor cache level into r5
163 mcr p15, 0, r5, c7, c14, 2 @ clean & invalidate by set/way
164 subs r9, r9, #1 @ decrement the index
166 subs r4, r4, r6 @ decrement the way
169 add r10, r10, #2 @ increment cache number
171 #ifdef CONFIG_ARM_ERRATA_814220
176 mov r10, #0 @ switch back to cache level 0
177 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
181 ENDPROC(v7_flush_dcache_all)
184 * v7_flush_cache_all()
186 * Flush the entire cache system.
187 * The data cache flush is now achieved using atomic clean / invalidates
188 * working outwards from L1 cache. This is done using Set/Way based cache
189 * maintenance instructions.
190 * The instruction cache can still be invalidated back to the point of
191 * unification in a single instruction.
194 ENTRY(v7_flush_kern_cache_all)
195 stmfd sp!, {r4-r6, r9-r10, lr}
196 bl v7_flush_dcache_all
198 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
199 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
200 ldmfd sp!, {r4-r6, r9-r10, lr}
202 ENDPROC(v7_flush_kern_cache_all)
205 * v7_flush_kern_cache_louis(void)
207 * Flush the data cache up to Level of Unification Inner Shareable.
208 * Invalidate the I-cache to the point of unification.
210 ENTRY(v7_flush_kern_cache_louis)
211 stmfd sp!, {r4-r6, r9-r10, lr}
212 bl v7_flush_dcache_louis
214 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
215 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
216 ldmfd sp!, {r4-r6, r9-r10, lr}
218 ENDPROC(v7_flush_kern_cache_louis)
221 * v7_flush_cache_all()
223 * Flush all TLB entries in a particular address space
225 * - mm - mm_struct describing address space
227 ENTRY(v7_flush_user_cache_all)
231 * v7_flush_cache_range(start, end, flags)
233 * Flush a range of TLB entries in the specified address space.
235 * - start - start address (may not be aligned)
236 * - end - end address (exclusive, may not be aligned)
237 * - flags - vm_area_struct flags describing address space
239 * It is assumed that:
240 * - we have a VIPT cache.
242 ENTRY(v7_flush_user_cache_range)
244 ENDPROC(v7_flush_user_cache_all)
245 ENDPROC(v7_flush_user_cache_range)
248 * v7_coherent_kern_range(start,end)
250 * Ensure that the I and D caches are coherent within specified
251 * region. This is typically used when code has been written to
252 * a memory region, and will be executed.
254 * - start - virtual start address of region
255 * - end - virtual end address of region
257 * It is assumed that:
258 * - the Icache does not read data from the write buffer
260 ENTRY(v7_coherent_kern_range)
264 * v7_coherent_user_range(start,end)
266 * Ensure that the I and D caches are coherent within specified
267 * region. This is typically used when code has been written to
268 * a memory region, and will be executed.
270 * - start - virtual start address of region
271 * - end - virtual end address of region
273 * It is assumed that:
274 * - the Icache does not read data from the write buffer
276 ENTRY(v7_coherent_user_range)
278 dcache_line_size r2, r3
281 #ifdef CONFIG_ARM_ERRATA_764369
286 USER( mcr p15, 0, r12, c7, c11, 1 ) @ clean D line to the point of unification
291 #ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
295 icache_line_size r2, r3
300 USER( mcr p15, 0, r12, c7, c5, 1 ) @ invalidate I line
305 ALT_SMP(mcr p15, 0, r0, c7, c1, 6) @ invalidate BTB Inner Shareable
306 ALT_UP(mcr p15, 0, r0, c7, c5, 6) @ invalidate BTB
312 * Fault handling for the cache operation above. If the virtual address in r0
313 * isn't mapped, fail with -EFAULT.
316 #ifdef CONFIG_ARM_ERRATA_775420
322 ENDPROC(v7_coherent_kern_range)
323 ENDPROC(v7_coherent_user_range)
326 * v7_flush_kern_dcache_area(void *addr, size_t size)
328 * Ensure that the data held in the page kaddr is written back
329 * to the page in question.
331 * - addr - kernel address
332 * - size - region size
334 ENTRY(v7_flush_kern_dcache_area)
335 dcache_line_size r2, r3
339 #ifdef CONFIG_ARM_ERRATA_764369
344 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line
350 ENDPROC(v7_flush_kern_dcache_area)
353 * v7_dma_inv_range(start,end)
355 * Invalidate the data cache within the specified region; we will
356 * be performing a DMA operation in this region and we want to
357 * purge old data in the cache.
359 * - start - virtual start address of region
360 * - end - virtual end address of region
363 dcache_line_size r2, r3
367 #ifdef CONFIG_ARM_ERRATA_764369
371 mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
376 mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
379 mcrlo p15, 0, r0, c7, c6, 1 @ invalidate D / U line
385 ENDPROC(v7_dma_inv_range)
388 * v7_dma_clean_range(start,end)
389 * - start - virtual start address of region
390 * - end - virtual end address of region
393 dcache_line_size r2, r3
396 #ifdef CONFIG_ARM_ERRATA_764369
401 mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
407 ENDPROC(v7_dma_clean_range)
410 * v7_dma_flush_range(start,end)
411 * - start - virtual start address of region
412 * - end - virtual end address of region
414 ENTRY(v7_dma_flush_range)
415 dcache_line_size r2, r3
418 #ifdef CONFIG_ARM_ERRATA_764369
423 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
429 ENDPROC(v7_dma_flush_range)
432 * dma_map_area(start, size, dir)
433 * - start - kernel virtual start address
434 * - size - size of region
435 * - dir - DMA direction
437 ENTRY(v7_dma_map_area)
439 teq r2, #DMA_FROM_DEVICE
442 ENDPROC(v7_dma_map_area)
445 * dma_unmap_area(start, size, dir)
446 * - start - kernel virtual start address
447 * - size - size of region
448 * - dir - DMA direction
450 ENTRY(v7_dma_unmap_area)
452 teq r2, #DMA_TO_DEVICE
455 ENDPROC(v7_dma_unmap_area)
459 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
460 define_cache_functions v7
462 /* The Broadcom Brahma-B15 read-ahead cache requires some modifications
463 * to the v7_cache_fns, we only override the ones we need
465 #ifndef CONFIG_CACHE_B15_RAC
466 globl_equ b15_flush_kern_cache_all, v7_flush_kern_cache_all
468 globl_equ b15_flush_icache_all, v7_flush_icache_all
469 globl_equ b15_flush_kern_cache_louis, v7_flush_kern_cache_louis
470 globl_equ b15_flush_user_cache_all, v7_flush_user_cache_all
471 globl_equ b15_flush_user_cache_range, v7_flush_user_cache_range
472 globl_equ b15_coherent_kern_range, v7_coherent_kern_range
473 globl_equ b15_coherent_user_range, v7_coherent_user_range
474 globl_equ b15_flush_kern_dcache_area, v7_flush_kern_dcache_area
476 globl_equ b15_dma_map_area, v7_dma_map_area
477 globl_equ b15_dma_unmap_area, v7_dma_unmap_area
478 globl_equ b15_dma_flush_range, v7_dma_flush_range
480 define_cache_functions b15