xiaoxiang781216 commented on a change in pull request #5650:
URL: https://github.com/apache/incubator-nuttx/pull/5650#discussion_r816555456
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File path: arch/arm/src/armv7-a/cp15_clean_dcache_all.S
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@@ -91,19 +91,32 @@
cp15_clean_dcache_all:
+ push {r4, r5}
+
mrc CP15_CCSIDR(r1) /* Read the Cache Size
Identification Register */
+ mov r5, r1
ldr r3, =0x7fff /* Isolate the NumSets
field (bits 13-27) */
and r0, r3, r1, lsr #13 /* r0=NumSets (number
of sets - 1) */
ldr r3, =0x3ff /* Isolate the way
field (bits 3-12) */
and r1, r3, r1, lsr #3 /* r1=(number of ways -
1) */
+ add r1, #1
+ clz r4, r1
+ add r4, #1 /* r4=Set/way operation
Way shift */
Review comment:
add r4, r1, #1
clz r4
add r4, #1
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