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[POWERPC] Add function to check if address is an IO port

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This adds a function that tells you if a given kernel virtual address
is hitting a PCI or ISA IO port permanent mapping or not. This is to
be used in the next patch to fix iomap APIs to properly unmap things.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2007-07-26 14:07:13 +10:00
committed by Paul Mackerras
parent f5d834fc34
commit 6dfbde2091
2 changed files with 43 additions and 0 deletions
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23
arch/powerpc/kernel/pci-common.c
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@@ -101,6 +101,29 @@ void pcibios_free_controller(struct pci_controller *phb)
kfree(phb);
}
int pcibios_vaddr_is_ioport(void __iomem *address)
{
int ret = 0;
struct pci_controller *hose;
unsigned long size;
spin_lock(&hose_spinlock);
list_for_each_entry(hose, &hose_list, list_node) {
#ifdef CONFIG_PPC64
size = hose->pci_io_size;
#else
size = hose->io_resource.end - hose->io_resource.start + 1;
#endif
if (address >= hose->io_base_virt &&
address < (hose->io_base_virt + size)) {
ret = 1;
break;
}
}
spin_unlock(&hose_spinlock);
return ret;
}
/*
* Return the domain number for this bus.
*/