Changeset b80d132 in mainline for boot/arch/arm32/src/asm.S

Timestamp:

2013-01-23T20:48:23Z (11 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

df334ca

Parents:

bfb6576

Message:

arm32, boot: Flush everything to PoC (memory) and disable caches before reaching kernel

This should be safe for all ARMs. Kernel will enable caches if it is supported.

File:

• boot/arch/arm32/src/asm.S (modified) (2 diffs)

boot/arch/arm32/src/asm.S

@@ -66 +66 @@
         # r2 is a kernel text end
 
+#define CP15_C1_IC              12
+#define CP15_C1_BP              11
+#define CP15_C1_DC              2
+        # Disable I-cache and D-cache before the kernel is started.
+        mrc     p15, 0, r4, c1, c0, 0
+        bic     r4, r4, #(1 << CP15_C1_DC)
+        bic     r4, r4, #(1 << CP15_C1_IC)
+        bic     r4, r4, #(1 << CP15_C1_BP)
+        mcr     p15, 0, r4, c1, c0, 0
+
         
         #Wait for the operations to complete
@@ -89 +99 @@
 #endif
         
+#TODO:This should not be necessary
 
 #if defined(MACHINE_gta02)
 
-#define CP15_C1_IC              12
-#define CP15_C1_DC              2
 #define CP15_C7_SEG_SHIFT       5
 #define CP15_C7_SEG_SIZE        3
 #define CP15_C7_IDX_SHIFT       26
-
-        # Disable I-cache and D-cache before the kernel is started.
-        mrc     p15, 0, r4, c1, c0, 0
-        bic     r4, r4, #(1 << CP15_C1_DC)
-        bic     r4, r4, #(1 << CP15_C1_IC)
-        mcr     p15, 0, r4, c1, c0, 0
 
         # Now clean D-cache to guarantee coherency between I-cache and D-cache.