From 6a6d55c38c8b4ee77b50a33f03ea09e75b18bf82 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Fri, 10 Feb 2012 18:07:07 -0800 Subject: ARM: virt: Update documentation for hyp mode entry support Document the possibility of the kernel being entered in HYP mode. Signed-off-by: Dave Martin Signed-off-by: Marc Zyngier --- Documentation/arm/Booting | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) (limited to 'Documentation') diff --git a/Documentation/arm/Booting b/Documentation/arm/Booting index a341d87d276e..0c1f475fdf36 100644 --- a/Documentation/arm/Booting +++ b/Documentation/arm/Booting @@ -154,13 +154,33 @@ In either case, the following conditions must be met: - CPU mode All forms of interrupts must be disabled (IRQs and FIQs) - The CPU must be in SVC mode. (A special exception exists for Angel) + + For CPUs which do not include the ARM virtualization extensions, the + CPU must be in SVC mode. (A special exception exists for Angel) + + CPUs which include support for the virtualization extensions can be + entered in HYP mode in order to enable the kernel to make full use of + these extensions. This is the recommended boot method for such CPUs, + unless the virtualisations are already in use by a pre-installed + hypervisor. + + If the kernel is not entered in HYP mode for any reason, it must be + entered in SVC mode. - Caches, MMUs The MMU must be off. Instruction cache may be on or off. Data cache must be off. + If the kernel is entered in HYP mode, the above requirements apply to + the HYP mode configuration in addition to the ordinary PL1 (privileged + kernel modes) configuration. In addition, all traps into the + hypervisor must be disabled, and PL1 access must be granted for all + peripherals and CPU resources for which this is architecturally + possible. Except for entering in HYP mode, the system configuration + should be such that a kernel which does not include support for the + virtualization extensions can boot correctly without extra help. + - The boot loader is expected to call the kernel image by jumping directly to the first instruction of the kernel image. -- cgit v1.2.3-59-g8ed1b