Changeset 1bd99214 in mainline

Timestamp:

2012-04-02T22:44:00Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

4d02595

Parents:

a5f007f

Message:

arm32: Initialize flags on armv7 CPUs.

No fancy memory settings.
Turn on caching.

File:

• kernel/arch/arm32/src/cpu/cpu.c (modified) (1 diff)

kernel/arch/arm32/src/cpu/cpu.c

@@ -100 +100 @@
 void cpu_arch_init(void)
 {
+#if defined(PROCESSOR_armv7)
+        uint32_t control_reg = 0;
+        asm volatile (
+                "mrc p15, 0, %[control_reg], c1, c0"
+                : [control_reg] "=r" (control_reg)
+        );
+        
+        /* Turn off tex remap */
+        control_reg &= ~CP15_R1_TRE_BIT;
+        /* Turn off accessed flag */
+        control_reg &= ~(CP15_R1_AFE_BIT | CP15_R1_HA_ENABLE_BIT);
+        /* Enable caching */
+        control_reg |= CP15_R1_CACHE_ENABLE_BIT;
+        
+        asm volatile (
+                "mcr p15, 0, %[control_reg], c1, c0"
+                :: [control_reg] "r" (control_reg)
+        );
+#endif
 }