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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2019-02-20 15:00:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 14:50:28 +0100 |
| commit | 0aa85e608198db46d7e7e6b08d8b217592b6b7dc (patch) | |
| tree | 00eddcc3e129531234edae4ef472401dc7792b44 /arch/arm | |
| parent | 0acf4a0034b5671862035a1e5db3c6600a8d43fd (diff) | |
ARM: 8849/1: NOMMU: Fix encodings for PMSAv8's PRBAR4/PRLAR4
[ 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 <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/kernel/head-nommu.S | 4 |
1 files 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 |