Commit 810c86ee authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall

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Comments in asm/virt.h are slightly out of date, so let's align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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@linaro.org>
parent 4993fdcf
...@@ -19,9 +19,14 @@ ...@@ -19,9 +19,14 @@
#define __ASM__VIRT_H #define __ASM__VIRT_H
/* /*
* The arm64 hcall implementation uses x0 to specify the hcall type. A value * The arm64 hcall implementation uses x0 to specify the hcall
* less than 0xfff indicates a special hcall, such as get/set vector. * number. A value less than HVC_STUB_HCALL_NR indicates a special
* Any other value is used as a pointer to the function to call. * 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. */ /* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
......
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