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authorFurquan Shaikh <furquan@google.com>2014-07-14 11:50:09 -0700
committerMarc Jones <marc.jones@se-eng.com>2015-03-05 17:32:08 +0100
commit9c8cfc5c25876991751ff4e533a0c421203139c8 (patch)
treed838fe039d49bd523c00bd728a5acf9eb3fcf9e0 /src/arch/arm64
parentf13c567c9713538789ec3ef3f478e1c52816d959 (diff)
coreboot arm64: Add proper masks for setting SCTLR and SCR regs to 0 at init
Since RES1 and RES0 bits are marked as SBOP(Should-Be-One-or-Preserved) and SBZP(Should-Be-Zero-or-Preserved) respectively, resetting the SCTLR and SCR registers should be done with proper bitmask. BUG=None BRANCH=None TEST=Compiles successfully and verified that the RES bits are preserved across register writes. Original-Change-Id: I5094ba7e51e8ea6f7d7612ba4d11b10dcbdb1607 Original-Signed-off-by: Furquan Shaikh <furquan@google.com> Original-Reviewed-on: https://chromium-review.googlesource.com/207815 Original-Tested-by: Furquan Shaikh <furquan@chromium.org> Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org> (cherry picked from commit dfb196b4063e4f94d1ba9d5e2d19bae624ed46b3) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I033a68b723fea83817aaa6402b86c78abd3e1da9 Reviewed-on: http://review.coreboot.org/8592 Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Aaron Durbin <adurbin@google.com> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/arch/arm64')
-rw-r--r--src/arch/arm64/stage_entry.S18
1 files changed, 16 insertions, 2 deletions
diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S
index 56eca77aae..8e57706354 100644
--- a/src/arch/arm64/stage_entry.S
+++ b/src/arch/arm64/stage_entry.S
@@ -21,9 +21,17 @@
#include <arch/asm.h>
ENTRY(arm64_el3_startup)
- mov x0, xzr
+ /* Set all bits in SCTLR_EL3 to 0 except RES1 and RES0 */
+ mrs x0, SCTLR_EL3
+ ldr x1, .SCTLR_MASK
+ and x0, x0, x1
msr SCTLR_EL3, x0
- msr SCR_EL3, x0
+ /* Set all bits in SCR_EL3 to 0 except RES1 and RES0 */
+ mrs x0, SCR_EL3
+ ldr x1, .SCR_MASK
+ and x0, x0, x1
+ msr SCR_EL3, x0
+
/* Have stack pointer use SP_EL0. */
msr SPSel, #0
isb
@@ -39,6 +47,12 @@ ENTRY(arm64_el3_startup)
br x1
.align 4
+ .SCTLR_MASK:
+ .quad 0x0FFFFEFF0
+
+ .SCR_MASK:
+ .quad 0x0FFFFC070
+ .align 4
/*
* By default branch to main() and initialize the stack according
* to the Kconfig option for cpu0. However, this code can be relocated