[RFC] inline hypercall implementation for pseries

[Arnd Bergmann]

On Sunday 10 September 2006 00:42, Arnd Bergmann wrote:
> +       /* get time and PURR snapshots after hcall */
> +       mftb    r14                     /* timebase after */
> +       subf    r15,r15,r14             /* time delta */
> +BEGIN_FTR_SECTION
> +       mfspr   r14,SPRN_PURR           /* PURR after */
> +       subf    r16,r16,r14             /* delta */
> +END_FTR_SECTION_IFCLR(CPU_FTR_PURR)
> +
> +       /* update stats */
> +       ld      r14,HCALL_STAT_CALLS(r13) /* count */
> +       addi    r14,r14,1
> +       std     r14,HCALL_STAT_CALLS(r13)
> +       ld      r14,HCALL_STAT_TB(r13)  /* timebase */
> +       add     r14,r14,r5
> +       std     r14,HCALL_STAT_TB(r13)
> +BEGIN_FTR_SECTION
> +       ld      r14,HCALL_STAT_PURR(r13)/* PURR */
> +       add     r14,r14,r6
> +       std     r14,HCALL_STAT_PURR(r13)
> +END_FTR_SECTION_IFCLR(CPU_FTR_PURR)


Hmm, seems I cut too much there, it should at least contain
a HVSC instruction, after the first END_FTR_SECTION. It may
also be better to use higher registers instead of r13...r16.

	Arnd <><