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-rw-r--r--src/include/device/device.h12
-rw-r--r--src/include/device/resource.h1
2 files changed, 11 insertions, 2 deletions
diff --git a/src/include/device/device.h b/src/include/device/device.h
index 1515b45e02..eaf84c6d0a 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -173,17 +173,25 @@ unsigned int scan_static_bus(device_t bus, unsigned int max);
void fixed_mem_resource(device_t dev, unsigned long index,
unsigned long basek, unsigned long sizek, unsigned long type);
+
+/* It is the caller's responsibility to adjust regions such that ram_resource()
+ * and mmio_resource() do not overlap.
+ *
+ * Current MTRR setup creates exclusive uncacheable holes for uma_resource()
+ * only and these are allowed to overlap any ram_resource(). This approach
+ * is used for all UMA except Intel Sandy/IvyBridge.
+ */
#define ram_resource(dev, idx, basek, sizek) \
fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_CACHEABLE)
#define bad_ram_resource(dev, idx, basek, sizek) \
- fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_RESERVE | IORESOURCE_CACHEABLE )
+ fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_RESERVE | IORESOURCE_IGNORE_MTRR)
#define uma_resource(dev, idx, basek, sizek) \
fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_RESERVE | IORESOURCE_UMA_FB)
#define mmio_resource(dev, idx, basek, sizek) \
- fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_RESERVE)
+ fixed_mem_resource(dev, idx, basek, sizek, IORESOURCE_RESERVE | IORESOURCE_IGNORE_MTRR)
void tolm_test(void *gp, struct device *dev, struct resource *new);
u32 find_pci_tolm(struct bus *bus);
diff --git a/src/include/device/resource.h b/src/include/device/resource.h
index e667f91c9d..c28ada5242 100644
--- a/src/include/device/resource.h
+++ b/src/include/device/resource.h
@@ -21,6 +21,7 @@
*/
#define IORESOURCE_BRIDGE 0x00080000 /* The IO resource has a bus below it. */
#define IORESOURCE_UMA_FB 0x00100000 /* UMA framebuffer */
+#define IORESOURCE_IGNORE_MTRR 0x00200000 /* The resource does not affect MTRR setup. */
#define IORESOURCE_RESERVE 0x10000000 /* The resource needs to be reserved in the coreboot table */
#define IORESOURCE_STORED 0x20000000 /* The IO resource assignment has been stored in the device */