From: geoff@infradead.org (Geoff Levand)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 04/13] arm64: Add new hcall HVC_CALL_FUNC
Date: Wed, 10 Sep 2014 10:23:57 -0700 [thread overview]
Message-ID: <1410369837.11440.18.camel@smoke> (raw)
In-Reply-To: <20140910170740.GE1710@arm.com>
Hi Will,
On Wed, 2014-09-10 at 18:07 +0100, Will Deacon wrote:
> On Tue, Sep 09, 2014 at 11:49:04PM +0100, Geoff Levand wrote:
> > Add the new hcall HVC_CALL_FUNC that allows execution of a function at EL2.
> > During CPU reset the CPU must be brought to the exception level it had on
> > entry to the kernel. The HVC_CALL_FUNC hcall will provide the mechanism
> > needed for this exception level switch.
> >
> > Signed-off-by: Geoff Levand <geoff@infradead.org>
> > ---
> > arch/arm64/include/asm/virt.h | 11 +++++++++++
> > arch/arm64/kernel/hyp-stub.S | 10 ++++++++++
> > 2 files changed, 21 insertions(+)
>
> [...]
>
> > diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
> > index 9ab5f70..a21cf51 100644
> > --- a/arch/arm64/kernel/hyp-stub.S
> > +++ b/arch/arm64/kernel/hyp-stub.S
> > @@ -75,7 +75,17 @@ el1_sync:
> > 1: cmp x10, #HVC_SET_VECTORS
> > b.ne 1f
> > msr vbar_el2, x0
> > + b 2f
> >
> > +1: cmp x10, #HVC_CALL_FUNC
> > + b.ne 1f
> > + mov x29, lr
> > + mov lr, x0
> > + mov x0, x1
> > + mov x1, x2
> > + mov x2, x3
> > + blr lr
> > + mov lr, x29
>
> Why are you clobbering x29?
I can change this to x28, unless you can recommend another?
-Geoff
next prev parent reply other threads:[~2014-09-10 17:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 22:51 [PATCH 00/13] arm64 kexec kernel patches V2 Geoff Levand
2014-09-09 22:49 ` [PATCH 07/13] arm64: Add new routine local_disable Geoff Levand
2014-09-15 18:56 ` Mark Rutland
2014-09-25 0:24 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 06/13] arm64: Add new routine read_cpu_properties Geoff Levand
2014-09-15 18:42 ` Mark Rutland
2014-09-25 0:23 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 01/13] arm64: Add ESR_EL2_EC macros to hyp-stub Geoff Levand
2014-09-15 16:10 ` Mark Rutland
2014-09-22 21:45 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 05/13] arm64: Add EL2 switch to soft_restart Geoff Levand
2014-09-09 22:49 ` [PATCH 03/13] arm64: Convert hcalls to use ISS field Geoff Levand
2014-09-11 16:14 ` Arun Chandran
2014-09-15 17:57 ` Mark Rutland
2014-09-22 21:46 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 04/13] arm64: Add new hcall HVC_CALL_FUNC Geoff Levand
2014-09-10 17:07 ` Will Deacon
2014-09-10 17:23 ` Geoff Levand [this message]
2014-09-10 17:35 ` Will Deacon
2014-09-10 18:11 ` [PATCH V2 " Geoff Levand
2014-09-15 18:11 ` [PATCH " Mark Rutland
2014-09-25 0:24 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 02/13] arm64/kvm: Fix assembler compatibility of macros Geoff Levand
2014-09-10 8:40 ` Ard Biesheuvel
2014-09-10 16:35 ` Geoff Levand
2014-09-10 17:09 ` Ard Biesheuvel
2014-09-15 16:14 ` Mark Rutland
2014-09-10 18:04 ` [PATCH V2 " Geoff Levand
2014-09-09 22:49 ` [PATCH 09/13] arm64/kexec: Kexec expects cpu_die Geoff Levand
2014-09-15 19:10 ` Mark Rutland
2014-09-09 22:49 ` [PATCH 10/13] arm64/kexec: Revert change to machine_shutdown() Geoff Levand
2014-09-15 19:20 ` Mark Rutland
2014-09-09 22:49 ` [PATCH 11/13] arm64/kexec: Add core kexec support Geoff Levand
2014-09-18 1:13 ` Mark Rutland
2014-09-25 0:25 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 08/13] arm64: Use cpu_ops for smp_stop Geoff Levand
2014-09-15 19:06 ` Mark Rutland
2014-09-25 0:24 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 13/13] arm64/kexec: Add kexec_ignore_compat_check param Geoff Levand
2014-09-09 22:49 ` [PATCH 12/13] arm64/kexec: Enable kexec in the arm64 defconfig Geoff Levand
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