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Diffstat (limited to 'src/arm/PL1/kernel/paging.c')
-rw-r--r--src/arm/PL1/kernel/paging.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/src/arm/PL1/kernel/paging.c b/src/arm/PL1/kernel/paging.c
index 771c681..6da9905 100644
--- a/src/arm/PL1/kernel/paging.c
+++ b/src/arm/PL1/kernel/paging.c
@@ -101,10 +101,11 @@ void setup_flat_map(void)
// enable MMU
puts("enabling the MMU");
- // redundant - we already have SCTLR contents in the variable
- // asm("mrc p15, 0, %0, c1, c0, 0" : "=r" (SCTLR.raw));
+ // we already have SCTLR contents in the variable
- SCTLR.fields.M = 1;
+ SCTLR.fields.M = 1; // enable MMU
+ SCTLR.fields.C = 1; // enable data cache
+ SCTLR.fields.I = 1; // enable instruction cache
asm("mcr p15, 0, %0, c1, c0, 0\n\r"
"isb" :: "r" (SCTLR.raw) : "memory");
@@ -241,6 +242,14 @@ uint16_t claim_and_map_section
// write modified descriptor to the table
*section_entry = descriptor;
+ // invalidate instruction cache
+ asm("mcr p15, 0, r0, c7, c5, 0\n\r" // r0 gets ignored
+ "isb" ::: "memory");
+
+ // invalidate branch-prediction
+ asm("mcr p15, 0, r0, c7, c5, 6\n\r" // r0 - same as above
+ "isb" ::: "memory");
+
// invalidate main Translation Lookup Buffer
asm("mcr p15, 0, r1, c8, c7, 0\n\r"
"isb" ::: "memory");