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authorWojtek Kosior <kwojtus@protonmail.com>2020-01-15 16:30:05 +0100
committerWojtek Kosior <kwojtus@protonmail.com>2020-01-15 16:30:05 +0100
commitc77286c6951223be1c216c19278cecca3b43ceb5 (patch)
treee44cbd48ed9d1acacbd531830c34a8a1f57587a7
parentc7b47accc6de3521f10c323983a1b325a60fb421 (diff)
downloadrpi-MMU-example-c77286c6951223be1c216c19278cecca3b43ceb5.tar.gz
rpi-MMU-example-c77286c6951223be1c216c19278cecca3b43ceb5.zip
for safety - invalidate caches when creating a new mapping
-rw-r--r--src/arm/PL1/kernel/paging.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/arm/PL1/kernel/paging.c b/src/arm/PL1/kernel/paging.c
index 4c3dccf..6da9905 100644
--- a/src/arm/PL1/kernel/paging.c
+++ b/src/arm/PL1/kernel/paging.c
@@ -242,6 +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");