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ARM: 8784/1: NOMMU: Allow enter in Hyp mode

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ARMv8R adds support for virtualisation extension (with some deviation
from v8A). With this patch hyp-unaware boot code can offload to kernel
setting up HYP stuff in a sane state.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Vladimir Murzin 2018-07-23 09:37:09 +01:00 committed by Russell King
parent c803ce3f18
commit cbfc5619e0
2 changed files with 10 additions and 3 deletions
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12
arch/arm/kernel/head-nommu.S
View File

@ -53,7 +53,11 @@ ENTRY(stext)
THUMB(1: )
#endif
setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
#ifdef CONFIG_ARM_VIRT_EXT
bl __hyp_stub_install
#endif
@ ensure svc mode and all interrupts masked
safe_svcmode_maskall r9
@ and irqs disabled
#if defined(CONFIG_CPU_CP15)
mrc p15, 0, r9, c0, c0 @ get processor id
@ -89,7 +93,11 @@ ENTRY(secondary_startup)
* the processor type - there is no need to check the machine type
* as it has already been validated by the primary processor.
*/
setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9
#ifdef CONFIG_ARM_VIRT_EXT
bl __hyp_stub_install_secondary
#endif
safe_svcmode_maskall r9
#ifndef CONFIG_CPU_CP15
ldr r9, =CONFIG_PROCESSOR_ID
#else

1
arch/arm/mm/Kconfig
View File

@ -702,7 +702,6 @@ config ARM_THUMBEE
config ARM_VIRT_EXT
bool
depends on MMU
default y if CPU_V7
help
Enable the kernel to make use of the ARM Virtualization