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@xxxxxxxxxx>
---
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,
};
--
2.26.2
