ARM: 8849/1: NOMMU: Fix encodings for PMSAv8's PRBAR4/PRLAR4

murzinv · Russell King · commit d410a8a49e3e · 2019-02-26T11:35:56.000Z
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: 046835b ("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
@@ -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
