From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1egCK3-0002wd-CK for barebox@lists.infradead.org; Mon, 29 Jan 2018 16:30:23 +0000 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7] helo=dude.pengutronix.de.) by metis.ext.pengutronix.de with esmtp (Exim 4.89) (envelope-from ) id 1egCJo-0001SG-77 for barebox@lists.infradead.org; Mon, 29 Jan 2018 17:30:04 +0100 From: Lucas Stach Subject: [PATCH 02/10] ARM: safely switch from HYP to SVC mode if required Date: Mon, 29 Jan 2018 17:29:56 +0100 Message-Id: <20180129163004.10512-3-l.stach@pengutronix.de> In-Reply-To: <20180129163004.10512-1-l.stach@pengutronix.de> References: <20180129163004.10512-1-l.stach@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org To: barebox@lists.infradead.org This is a port of the Linux safe_svcmode_maskall macro to the Barebox lowlevel init. Signed-off-by: Lucas Stach --- arch/arm/cpu/lowlevel.S | 20 ++++++++++++++++---- arch/arm/include/asm/system.h | 26 ++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 4 deletions(-) diff --git a/arch/arm/cpu/lowlevel.S b/arch/arm/cpu/lowlevel.S index 7696a198e764..194ce0e7c274 100644 --- a/arch/arm/cpu/lowlevel.S +++ b/arch/arm/cpu/lowlevel.S @@ -1,16 +1,28 @@ #include #include #include +#include .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 + mrs r12 , cpsr + 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) -- 2.15.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox