From 80c59dafb1a9a86fa996e6e34d06b60567c925ca Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Thu, 9 Feb 2012 08:47:17 -0800 Subject: ARM: virt: allow the kernel to be entered in HYP mode This patch does two things: * Ensure that asynchronous aborts are masked at kernel entry. The bootloader should be masking these anyway, but this reduces the damage window just in case it doesn't. * Enter svc mode via exception return to ensure that CPU state is properly serialised. This does not matter when switching from an ordinary privileged mode ("PL1" modes in ARMv7-AR rev C parlance), but it potentially does matter when switching from a another privileged mode such as hyp mode. This should allow the kernel to boot safely either from svc mode or hyp mode, even if no support for use of the ARM Virtualization Extensions is built into the kernel. Signed-off-by: Dave Martin Signed-off-by: Marc Zyngier --- arch/arm/include/asm/ptrace.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arm/include/asm/ptrace.h') diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 355ece523f41..91ef6c231c47 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -44,6 +44,7 @@ #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 -- cgit