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

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Comments in asm/virt.h are slightly out of date, so let's align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

arch/arm64/include/asm/virt.h

+8 −3
Original line number Diff line number Diff line
@@ -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. */