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Leave hypervisor mode upon startup on ARMv7

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If ARMv7 boots in HYP mode, switch to SVC32.

Reviewed by:   ian
Submitted by:  Wojciech Macek <wma@semihalf.com>
               Jakub Palider  <jpa@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Annapurna Labs
Differential Revision: https://reviews.freebsd.org/D1810
This commit is contained in:
Zbigniew Bodek 2015-08-25 14:49:11 +00:00
parent 57c69b1478
commit e43458ea41
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=287127
1 changed files with 39 additions and 0 deletions
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39
sys/arm/arm/locore-v6.S
View File

@ -45,12 +45,47 @@ __FBSDID("$FreeBSD$");
#define PTE1_SIZE L1_S_SIZE
#endif
#if __ARM_ARCH >= 7
#if defined(__ARM_ARCH_7VE__) || defined(__clang__)
/*
* HYP support is in bintuils >= 2.21 and gcc >= 4.9 defines __ARM_ARCH_7VE__
* when enabled. llvm >= 3.6 supports it too.
*/
.arch_extension virt
#define MSR_ELR_HYP(regnum) msr elr_hyp, lr
#define ERET eret
#else
#define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
#define ERET .word 0xe160006e
#endif
#endif /* __ARM_ARCH >= 7 */
/* A small statically-allocated stack used only during initarm() and AP startup. */
#define INIT_ARM_STACK_SIZE 2048
.text
.align 2
#if __ARM_ARCH >= 7
#define LEAVE_HYP \
/* Leave HYP mode */ ;\
mrs r0, cpsr ;\
and r0, r0, #(PSR_MODE) /* Mode is in the low 5 bits of CPSR */ ;\
teq r0, #(PSR_HYP32_MODE) /* Hyp Mode? */ ;\
bne 1f ;\
/* Ensure that IRQ, FIQ and Aborts will be disabled after eret */;\
mrs r0, spsr ;\
orr r0, r0, #(PSR_I | PSR_F | PSR_A) ;\
msr spsr, r0 ;\
/* Exit hypervisor mode */ ;\
adr lr, 1f ;\
MSR_ELR_HYP(14) ;\
ERET ;\
1:
#else
#define LEAVE_HYP
#endif /* __ARM_ARCH >= 7 */
/*
* On entry for FreeBSD boot ABI:
* r0 - metadata pointer or 0 (boothowto on AT91's boot2)
@ -76,6 +111,8 @@ ASENTRY_NP(_start)
mov r10, r2 /* Save meta data */
mov r11, r3 /* Future expansion */
LEAVE_HYP
/*
* Check whether data cache is enabled. If it is, then we know
* current tags are valid (not power-on garbage values) and there
@ -401,6 +438,8 @@ ASENTRY_NP(mpentry)
/* Make sure interrupts are disabled. */
cpsid ifa
LEAVE_HYP
/* Setup core, disable all caches. */
mrc CP15_SCTLR(r0)
bic r0, #CPU_CONTROL_MMU_ENABLE