[GitHub] [incubator-nuttx] xiaoxiang781216 commented on a change in pull request #5720: arch: Merge up_arch.h into up_internal.h

[GitBox <gi...@apache.org>]

xiaoxiang781216 commented on a change in pull request #5720:
URL: https://github.com/apache/incubator-nuttx/pull/5720#discussion_r825384301



##########
File path: arch/arm/src/common/arm_internal.h
##########
@@ -182,6 +182,19 @@
 #define INTSTACK_COLOR 0xdeadbeef
 #define HEAP_COLOR     'h'
 
+#define getreg8(a)     (*(volatile uint8_t *)(a))
+#define putreg8(v,a)   (*(volatile uint8_t *)(a) = (v))
+#define getreg16(a)    (*(volatile uint16_t *)(a))
+#define putreg16(v,a)  (*(volatile uint16_t *)(a) = (v))
+#define getreg32(a)    (*(volatile uint32_t *)(a))
+#define putreg32(v,a)  (*(volatile uint32_t *)(a) = (v))
+
+/* Non-atomic, but more effective modification of registers */
+
+#define modreg8(v,m,a)  putreg8((getreg8(a) & ~(m)) | ((v) & (m)), a)
+#define modreg16(v,m,a) putreg16((getreg16(a) & ~(m)) | ((v) & (m)), a)
+#define modreg32(v,m,a) putreg32((getreg32(a) & ~(m)) | ((v) & (m)), a)

Review comment:
       Done.




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