Re: [Qemu-devel] [PATCH 3/9] pci: define a constant to represent a unmapped bar and use it.

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jul 15, 2009 at 08:15:03PM +0900, Isaku Yamahata wrote:
> define a constant to represent a unmapped bar instead of -1 and use it.
> 
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/cirrus_vga.c |    2 +-
>  hw/pci.c        |   18 +++++++++---------
>  hw/pci.h        |    1 +
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
> index 1d800e9..88868b9 100644
> --- a/hw/cirrus_vga.c
> +++ b/hw/cirrus_vga.c
> @@ -3296,7 +3296,7 @@ static void pci_cirrus_write_config(PCIDevice *d,
>      CirrusVGAState *s = &pvs->cirrus_vga;
>  
>      pci_default_write_config(d, address, val, len);
> -    if (s->vga.map_addr && pvs->dev.io_regions[0].addr == -1)
> +    if (s->vga.map_addr && pvs->dev.io_regions[0].addr == PCI_BAR_UNMAPPED)
>          s->vga.map_addr = 0;
>      cirrus_update_memory_access(s);
>  }
> diff --git a/hw/pci.c b/hw/pci.c
> index 916938a..03241d4 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -369,7 +369,7 @@ static void pci_unregister_io_regions(PCIDevice *pci_dev)
>  
>      for(i = 0; i < PCI_NUM_REGIONS; i++) {
>          r = &pci_dev->io_regions[i];
> -        if (!r->size || r->addr == -1)
> +        if (!r->size || r->addr == PCI_BAR_UNMAPPED)
>              continue;
>          if (r->type == PCI_ADDRESS_SPACE_IO) {
>              isa_unassign_ioport(r->addr, r->size);
> @@ -416,7 +416,7 @@ void pci_register_bar(PCIDevice *pci_dev, int region_num,
>      }
>  
>      r = &pci_dev->io_regions[region_num];
> -    r->addr = -1;
> +    r->addr = PCI_BAR_UNMAPPED;
>      r->size = size;
>      r->type = type;
>      r->map_func = map_func;
> @@ -458,10 +458,10 @@ static void pci_update_mappings(PCIDevice *d)
>                      /* NOTE: we have only 64K ioports on PC */
>                      if (last_addr <= new_addr || new_addr == 0 ||
>                          last_addr >= 0x10000) {
> -                        new_addr = -1;
> +                        new_addr = PCI_BAR_UNMAPPED;
>                      }
>                  } else {
> -                    new_addr = -1;
> +                    new_addr = PCI_BAR_UNMAPPED;
>                  }
>              } else {
>                  if (cmd & PCI_COMMAND_MEMORY) {
> @@ -477,17 +477,17 @@ static void pci_update_mappings(PCIDevice *d)
>                         mappings, we handle specific values as invalid
>                         mappings. */
>                      if (last_addr <= new_addr || new_addr == 0 ||
> -                        last_addr == -1) {
> -                        new_addr = -1;
> +                        last_addr == PCI_BAR_UNMAPPED) {
> +                        new_addr = PCI_BAR_UNMAPPED;
>                      }
>                  } else {
>                  no_mem_map:
> -                    new_addr = -1;
> +                    new_addr = PCI_BAR_UNMAPPED;
>                  }
>              }
>              /* now do the real mapping */
>              if (new_addr != r->addr) {
> -                if (r->addr != -1) {
> +                if (r->addr != PCI_BAR_UNMAPPED) {
>                      if (r->type & PCI_ADDRESS_SPACE_IO) {
>                          int class;
>                          /* NOTE: specific hack for IDE in PC case:
> @@ -506,7 +506,7 @@ static void pci_update_mappings(PCIDevice *d)
>                      }
>                  }
>                  r->addr = new_addr;
> -                if (r->addr != -1) {
> +                if (r->addr != PCI_BAR_UNMAPPED) {
>                      r->map_func(d, i, r->addr, r->size, r->type);
>                  }
>              }
> diff --git a/hw/pci.h b/hw/pci.h
> index 17563ed..9d60c36 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -84,6 +84,7 @@ typedef int PCIUnregisterFunc(PCIDevice *pci_dev);
>  
>  typedef struct PCIIORegion {
>      uint32_t addr; /* current PCI mapping address. -1 means not mapped */
> +#define PCI_BAR_UNMAPPED        (~(uint32_t)0)
>      uint32_t size;
>      uint8_t type;
>      PCIMapIORegionFunc *map_func;
> -- 
> 1.6.0.2
> 
>