[PATCH AUTOSEL 4.19 222/671] ARM: 8849/1: NOMMU: Fix encodings for PMSAv8's PRBAR4/PRLAR4
From: Sasha Levin <sashal@kernel.org>
Date: 2020-01-16 19:04:03
Also in:
lkml, stable
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
From: Vladimir Murzin <redacted>
[ Upstream commit d410a8a49e3e00e07d43037e90f776d522b25a6a ]
To access PRBARn, where n is referenced as a binary number:
MRC p15, 0, <Rt>, c6, c8+n[3:1], 4*n[0] ; Read PRBARn into Rt
MCR p15, 0, <Rt>, c6, c8+n[3:1], 4*n[0] ; Write Rt into PRBARn
To access PRLARn, where n is referenced as a binary number:
MRC p15, 0, <Rt>, c6, c8+n[3:1], 4*n[0]+1 ; Read PRLARn into Rt
MCR p15, 0, <Rt>, c6, c8+n[3:1], 4*n[0]+1 ; Write Rt into PRLARn
For PR{B,L}AR4, n is 4, n[0] is 0, n[3:1] is 2, while current encoding
done with n[0] set to 1 which is wrong. Use proper encoding instead.
Fixes: 046835b4aa22b9ab6aa0bb274e3b71047c4b887d ("ARM: 8757/1: NOMMU: Support PMSAv8 MPU")
Signed-off-by: Vladimir Murzin <redacted>
Signed-off-by: Russell King <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/kernel/head-nommu.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 326a97aa3ea0..22efcf48604c 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S@@ -441,8 +441,8 @@ M_CLASS(str r6, [r12, #PMSAv8_RLAR_A(3)]) str r5, [r12, #PMSAv8_RBAR_A(0)] str r6, [r12, #PMSAv8_RLAR_A(0)] #else - mcr p15, 0, r5, c6, c10, 1 @ PRBAR4 - mcr p15, 0, r6, c6, c10, 2 @ PRLAR4 + mcr p15, 0, r5, c6, c10, 0 @ PRBAR4 + mcr p15, 0, r6, c6, c10, 1 @ PRLAR4 #endif #endif ret lr
--
2.20.1
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