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authorVladimir Murzin <vladimir.murzin@arm.com>2019-02-20 14:00:53 (GMT)
committerRussell King <rmk+kernel@armlinux.org.uk>2019-02-26 11:35:56 (GMT)
commitd410a8a49e3e00e07d43037e90f776d522b25a6a (patch)
tree5b5d71c63902a8ce3dd318371f7ded6364b947c3 /arch
parentca70ea43f80c98582f5ffbbd1e6f4da2742da0c4 (diff)
ARM: 8849/1: NOMMU: Fix encodings for PMSAv8's PRBAR4/PRLAR4
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/head-nommu.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index ec29de2..c08d2d8 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -439,8 +439,8 @@ 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

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