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arm64: hyp-stub: Update documentation in asm/virt.h 

Comments in asm/virt.h are slightly out of date, so let's align
them with the new behaviour of the code.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Marc Zyngier 2017-04-03 19:37:38 +01:00 committed by Christoffer Dall
parent 4993fdcf39
commit 810c86ee4e
1 changed files with 8 additions and 3 deletions
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11
arch/arm64/include/asm/virt.h
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@ -19,9 +19,14 @@
#define __ASM__VIRT_H
/*
* The arm64 hcall implementation uses x0 to specify the hcall type. A value
* less than 0xfff indicates a special hcall, such as get/set vector.
* Any other value is used as a pointer to the function to call.
* The arm64 hcall implementation uses x0 to specify the hcall
* number. A value less than HVC_STUB_HCALL_NR indicates a special
* hcall, such as set vector. Any other value is handled in a
* hypervisor specific way.
*
* The hypercall is allowed to clobber any of the caller-saved
* registers (x0-x18), so it is advisable to use it through the
* indirection of a function call (as implemented in hyp-stub.S).
*/
/* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */