Re: [Xen-devel] [PATCH ARM v3 4/7] mini-os: moved events code under arch

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Thomas Leonard, le Wed 11 Jun 2014 11:30:15 +0100, a écrit :
> From: Karim Raslan <karim.allah.ahmed@xxxxxxxxx>
> 
> This is all code motion, except that we now initialise
> the ev_actions array before calling the arch-specific code
> to make it more robust against future changes.
> 
> Signed-off-by: Karim Allah Ahmed <karim.allah.ahmed@xxxxxxxxx>
> [talex5@xxxxxxxxx: separated from big ARM commit]
> Signed-off-by: Thomas Leonard <talex5@xxxxxxxxx>

Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>

> ---
>  extras/mini-os/arch/x86/events.c | 31 +++++++++++++++++++++++++++++++
>  extras/mini-os/events.c          | 24 ++++--------------------
>  extras/mini-os/include/events.h  |  3 +++
>  3 files changed, 38 insertions(+), 20 deletions(-)
>  create mode 100644 extras/mini-os/arch/x86/events.c
> 
> diff --git a/extras/mini-os/arch/x86/events.c 
> b/extras/mini-os/arch/x86/events.c
> new file mode 100644
> index 0000000..e420a98
> --- /dev/null
> +++ b/extras/mini-os/arch/x86/events.c
> @@ -0,0 +1,31 @@
> +#include <mini-os/os.h>
> +#include <mini-os/mm.h>
> +#include <mini-os/events.h>
> +
> +#if defined(__x86_64__)
> +char irqstack[2 * STACK_SIZE];
> +
> +static struct pda
> +{
> +    int irqcount;       /* offset 0 (used in x86_64.S) */
> +    char *irqstackptr;  /*        8 */
> +} cpu0_pda;
> +#endif
> +
> +void arch_init_events(void)
> +{
> +#if defined(__x86_64__)
> +    asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0));
> +    wrmsrl(0xc0000101, &cpu0_pda); /* 0xc0000101 is MSR_GS_BASE */
> +    cpu0_pda.irqcount = -1;
> +    cpu0_pda.irqstackptr = (void*) (((unsigned long)irqstack + 2 * 
> STACK_SIZE)
> +                                    & ~(STACK_SIZE - 1));
> +#endif
> +}
> +
> +void arch_fini_events(void)
> +{
> +#if defined(__x86_64__)
> +    wrmsrl(0xc0000101, NULL); /* 0xc0000101 is MSR_GS_BASE */
> +#endif
> +}
> diff --git a/extras/mini-os/events.c b/extras/mini-os/events.c
> index 2da9b01..d60630b 100644
> --- a/extras/mini-os/events.c
> +++ b/extras/mini-os/events.c
> @@ -167,44 +167,28 @@ evtchn_port_t bind_pirq(uint32_t pirq, int will_share,
>       return op.port;
>  }
>  
> -#if defined(__x86_64__)
> -char irqstack[2 * STACK_SIZE];
> -
> -static struct pda
> -{
> -    int irqcount;       /* offset 0 (used in x86_64.S) */
> -    char *irqstackptr;  /*        8 */
> -} cpu0_pda;
> -#endif
> -
>  /*
>   * Initially all events are without a handler and disabled
>   */
>  void init_events(void)
>  {
>      int i;
> -#if defined(__x86_64__)
> -    asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0));
> -    wrmsrl(0xc0000101, &cpu0_pda); /* 0xc0000101 is MSR_GS_BASE */
> -    cpu0_pda.irqcount = -1;
> -    cpu0_pda.irqstackptr = (void*) (((unsigned long)irqstack + 2 * 
> STACK_SIZE)
> -                                    & ~(STACK_SIZE - 1));
> -#endif
> +
>      /* initialize event handler */
>      for ( i = 0; i < NR_EVS; i++ )
>       {
>          ev_actions[i].handler = default_handler;
>          mask_evtchn(i);
>      }
> +
> +    arch_init_events();
>  }
>  
>  void fini_events(void)
>  {
>      /* Dealloc all events */
>      unbind_all_ports();
> -#if defined(__x86_64__)
> -    wrmsrl(0xc0000101, NULL); /* 0xc0000101 is MSR_GS_BASE */
> -#endif
> +    arch_fini_events();
>  }
>  
>  void default_handler(evtchn_port_t port, struct pt_regs *regs, void *ignore)
> diff --git a/extras/mini-os/include/events.h b/extras/mini-os/include/events.h
> index 0e9d3a7..0452d21 100644
> --- a/extras/mini-os/include/events.h
> +++ b/extras/mini-os/include/events.h
> @@ -25,6 +25,9 @@
>  typedef void (*evtchn_handler_t)(evtchn_port_t, struct pt_regs *, void *);
>  
>  /* prototypes */
> +void arch_init_events(void);
> +void arch_fini_events(void);
> +
>  int do_event(evtchn_port_t port, struct pt_regs *regs);
>  evtchn_port_t bind_virq(uint32_t virq, evtchn_handler_t handler, void *data);
>  evtchn_port_t bind_pirq(uint32_t pirq, int will_share, evtchn_handler_t 
> handler, void *data);
> -- 
> 2.0.0
> 
> 
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> http://lists.xen.org/xen-devel
> 

-- 
Samuel
<N> un driver qui fait quoi, alors ?
<y> ben pour les bips
<s> pour passer les oops en morse
 -+- #ens-mim - vive les rapports de bug -+-

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