Make IO space base address to be configurable through IO_SPACE_BASE.
This will allow architectures which do not natively support IO ports - like arm64 - to harden against legacy ISA-based drivers which use hardcoded addresses to access IO ports.
Any attempts for these drivers to request a resource region will now fail for architectures with set IO_SPACE_BASE above legacy ISA IO port region (0xffff).
Signed-off-by: John Garry john.garry@huawei.com --- kernel/resource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/resource.c b/kernel/resource.c index 3ae2f56cc79d..d191c4d796c7 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -29,7 +29,7 @@
struct resource ioport_resource = { .name = "PCI IO", - .start = 0, + .start = IO_SPACE_BASE, .end = IO_SPACE_LIMIT, .flags = IORESOURCE_IO, };