This is a port of the Linux safe_svcmode_maskall macro to
the Barebox lowlevel init.
Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Tested-by: Roland Hieber <r.hie...@pengutronix.de>
---
v3: fix whitespace
---
arch/arm/cpu/lowlevel.S | 18 +++++++++++++++---
arch/arm/include/asm/system.h | 26 ++++++++++++++++++++++++++
2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/arch/arm/cpu/lowlevel.S b/arch/arm/cpu/lowlevel.S
index 7696a198e764..43665981e48b 100644
--- a/arch/arm/cpu/lowlevel.S
+++ b/arch/arm/cpu/lowlevel.S
@@ -1,16 +1,28 @@
#include <linux/linkage.h>
#include <init.h>
#include <asm/system.h>
+#include <asm/opcodes-virt.h>
.section ".text_bare_init_","ax"
ENTRY(arm_cpu_lowlevel_init)
/* save lr, since it may be banked away with a processor mode change */
mov r2, lr
+
/* set the cpu to SVC32 mode, mask irq and fiq */
mrs r12, cpsr
- bic r12, r12, #0x1f
- orr r12, r12, #0xd3
- msr cpsr, r12
+ eor r12, r12, #HYP_MODE
+ tst r12, #MODE_MASK
+ bic r12, r12, #MODE_MASK
+ orr r12, r12, #(PSR_I_BIT | PSR_F_BIT | SVC_MODE)
+THUMB( orr r12, r12, #PSR_T_BIT )
+ bne 1f
+ orr r12, r12, #PSR_A_BIT
+ adr lr, 2f
+ msr spsr_cxsf, r12
+ __MSR_ELR_HYP(14)
+ __ERET
+1: msr cpsr_c, r12
+2:
#if __LINUX_ARM_ARCH__ >= 6
/*
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 57c76186b499..55e0f4090295 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -60,6 +60,32 @@
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
+/*
+ * PSR bits
+ */
+#define USR_MODE 0x00000010
+#define FIQ_MODE 0x00000011
+#define IRQ_MODE 0x00000012
+#define SVC_MODE 0x00000013
+#define ABT_MODE 0x00000017
+#define HYP_MODE 0x0000001a
+#define UND_MODE 0x0000001b
+#define SYSTEM_MODE 0x0000001f
+#define MODE32_BIT 0x00000010
+#define MODE_MASK 0x0000001f
+
+#define PSR_T_BIT 0x00000020
+#define PSR_F_BIT 0x00000040
+#define PSR_I_BIT 0x00000080
+#define PSR_A_BIT 0x00000100
+#define PSR_E_BIT 0x00000200
+#define PSR_J_BIT 0x01000000
+#define PSR_Q_BIT 0x08000000
+#define PSR_V_BIT 0x10000000
+#define PSR_C_BIT 0x20000000
+#define PSR_Z_BIT 0x40000000
+#define PSR_N_BIT 0x80000000
+
#ifndef __ASSEMBLY__
#if __LINUX_ARM_ARCH__ >= 7
static inline unsigned int current_el(void)
--
2.16.1
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