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>

diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index ec29de2..c08d2d8 100644 (file)
--- 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