[SeaBIOS] [PATCH 2/4] pci: add foreachcap() helper

[Isaku Yamahata]

Given the usage of 3/4, u32 pci_find_capability(bdf, cap) would be more direct.
Maybe this is a matter of taste, though.

On Sat, Aug 28, 2010 at 06:02:56PM +0300, Eduard - Gabriel Munteanu wrote:
> This iterates over capabilities exposed by PCI devices. It's needed by
> IOMMU initialization code to discover the Secure Device capability.
> 
> Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu at linux360.ro>
> ---
>  src/pci.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/src/pci.h b/src/pci.h
> index 9c3108c..60e0359 100644
> --- a/src/pci.h
> +++ b/src/pci.h
> @@ -2,6 +2,7 @@
>  #define __PCI_H
>  
>  #include "types.h" // u32
> +#include "pci_regs.h" // PCI_CAPABILITY_LIST et al.
>  
>  static inline u8 pci_bdf_to_bus(u16 bdf) {
>      return bdf >> 8;
> @@ -52,6 +53,10 @@ int pci_next(int bdf, int *pmax);
>      for (MAX=0x0100, BDF=pci_next(0, &MAX)      \
>           ; BDF >= 0                             \
>           ; BDF=pci_next(BDF+1, &MAX))
> +#define foreachcap(BDF, PTR, CAP)                                         \
> +    for (PTR = PCI_CAPABILITY_LIST, CAP = pci_config_readb(BDF, PTR);     \
> +         CAP;                                                             \
> +         PTR = CAP + PCI_CAP_LIST_NEXT, CAP = pci_config_readb(BDF, PTR))
>  
>  #define foreachpci_in_bus(BDF, MAX, BUS)                                \
>      for (MAX = pci_bus_devfn_to_bdf(BUS, 0) + 0x0100,                   \
> -- 
> 1.7.1
> 
> 
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-- 
yamahata