On 22.06.2012, at 22:06, Stuart Yoder wrote:
> From: Liu Yu-B13201 <[email protected]>
>
> Signed-off-by: Liu Yu <[email protected]>
> Signed-off-by: Stuart Yoder <[email protected]>
> ---
> -v11: no changes
>
> arch/powerpc/include/asm/epapr_hcalls.h | 22 +++++++++---------
> arch/powerpc/include/asm/fsl_hcalls.h | 36 +++++++++++++++---------------
> 2 files changed, 29 insertions(+), 29 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/epapr_hcalls.h
> b/arch/powerpc/include/asm/epapr_hcalls.h
> index 833ce2c..b8d9445 100644
> --- a/arch/powerpc/include/asm/epapr_hcalls.h
> +++ b/arch/powerpc/include/asm/epapr_hcalls.h
> @@ -195,7 +195,7 @@ static inline unsigned int ev_int_set_config(unsigned int
> interrupt,
> r5 = priority;
> r6 = destination;
>
> - __asm__ __volatile__ ("sc 1"
> + asm volatile("bl epapr_hypercall_start"
> : "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6)
> : : EV_HCALL_CLOBBERS4
Hrm. ePAPR hypercalls are allowed to clobber lr, right? But our hypercall entry
code depends on lr staying alive:
.global epapr_hypercall_start
epapr_hypercall_start:
li r3, -1
nop
nop
nop
blr
So I suppose for this to work, we'd have to store lr off to the stack before
doing the hypercall in epapr_hypercall_start.
Alex
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