Re: [XenPPC] [pushed][ppc] Must check softirq conditions on return from hcall.

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

This patch simply repeats the code sequence for the hdec handler.
Some Janitorial work on this file will be necessary soon.
-JX
On Mar 29, 2006, at 12:34 PM, jimix@xxxxxxxxxxxxxx wrote:

> changeset:   9667:910d71f2bf1b
> tag:         tip
> user:        jimix@xxxxxxxxxxxxxxxxxxxxx
> date:        Wed Mar 29 12:33:40 2006 -0500
> summary:     [ppc] Must check softirq conditions on return from hcall.
>
> diff -r 06bc81089a95 -r 910d71f2bf1b xen/arch/ppc/ppc64/exceptions.S
> --- a/xen/arch/ppc/ppc64/exceptions.S   Wed Mar 29 12:32:25 2006 -0500
> +++ b/xen/arch/ppc/ppc64/exceptions.S   Wed Mar 29 12:33:40 2006 -0500
> @@ -365,9 +365,33 @@ ex_hcall_continued:
>      mr r3, r1                           /* pass pointer to  
> cpu_user_regs */
>      subi r1, r1, STACK_FRAME_OVERHEAD   /* make a "caller" stack  
> frame */
>      CALL_CFUNC r12
> -
> +    /* test for pending softirqs, and loop until there are no  
> more. */
> +hcall_test_all_events:
> +    ld r3, PAREA_vcpu(r13)
> +    lwz r3, VCPU_processor(r3)
> +    LOADADDR r4, irq_stat
> +    sldi r3, r3, IRQSTAT_shift
> +    add r4, r3, r4
> +    ld r5, IRQSTAT_pending(r4)
> +    cmpldi r5, 0
> +    beq hcall_out
> +
> +    /* we could use nonvolatile GPRs across do_softirq calls, but  
> those are
> +     * volatile across exceptions :( */
> +    LOADADDR r6, ppc_do_softirq
> +    mfmsr r3                            /* we pass this MSR to  
> _do_softirq so
> +                                         * it can give it to us  
> back without
> +                                         * having to save it */
> +    ori r8, r3, MSR_EE
> +
> +    mtmsrd r8                           /* enable interrupts */
> +    CALL_CFUNC r6                       /* process softirqs  
> returns r3 */
> +    mtmsrd r3                           /* disable interrupts */
> +    b hcall_test_all_events                   /* look for more */
> +hcall_out:     
>      addi r1, r1, STACK_FRAME_OVERHEAD   /* restore stack to  
> cpu_user_regs */
>      b fast_resume
> +
>
>  ex_dec_continued:
>      EXCEPTION_SAVE_STATE r1
>
>
>
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