resources: introduce reserved_ram_resource()
mmio_resource() was previously being used for reserving
RAM from the OS by using IORESOURCE_IGNORE_MTRR atrribute.
Instead, be more explicit for those uses with
reserved_ram_resource(). bad_ram_resource() now calls
reserved_ram_resource(). Those resources are marked as cacheable
but reserved.
The sandybridge and haswell code were relying on the implementation
fo the MTRR algorithm's interaction for reserved regions. Instead
be explicit about what ranges are MMIO reserved and what are RAM
reserved.
Change-Id: I1e47026970fb37c0305e4d49a12c98b0cdd1abe5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2886
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c
index b57b28e..16196ad 100644
--- a/src/northbridge/intel/haswell/northbridge.c
+++ b/src/northbridge/intel/haswell/northbridge.c
@@ -53,15 +53,6 @@
return bridge_revision_id;
}
-/* Reserve everything between A segment and 1MB:
- *
- * 0xa0000 - 0xbffff: legacy VGA
- * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
- * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
- */
-static const int legacy_hole_base_k = 0xa0000 / 1024;
-static const int legacy_hole_size_k = 384;
-
void cbmem_post_handling(void)
{
update_mrc_cache();
@@ -414,9 +405,17 @@
if (size_k > 0)
ram_resource(dev, index++, base_k, size_k);
- mmio_resource(dev, index++, legacy_hole_base_k, legacy_hole_size_k);
+ /* Reserve everything between A segment and 1MB:
+ *
+ * 0xa0000 - 0xbffff: legacy VGA
+ * 0xc0000 - 0xfffff: RAM
+ */
+ mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10);
+ reserved_ram_resource(dev, index++, (0xc0000 >> 10),
+ (0x100000 - 0xc0000) >> 10);
#if CONFIG_CHROMEOS_RAMOOPS
- mmio_resource(dev, index++, CONFIG_CHROMEOS_RAMOOPS_RAM_START >> 10,
+ reserved_ram_resource(dev, index++,
+ CONFIG_CHROMEOS_RAMOOPS_RAM_START >> 10,
CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE >> 10);
#endif
}
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c
index 13390bd..c39933f 100644
--- a/src/northbridge/intel/sandybridge/northbridge.c
+++ b/src/northbridge/intel/sandybridge/northbridge.c
@@ -127,10 +127,14 @@
IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}
- mmio_resource(dev, index++, legacy_hole_base_k, legacy_hole_size_k);
+ mmio_resource(dev, index++, legacy_hole_base_k,
+ (0xc0000 >> 10) - legacy_hole_base_k);
+ reserved_ram_resource(dev, index++, 0xc0000 >> 10,
+ (0x100000 - 0xc0000) >> 10);
#if CONFIG_CHROMEOS_RAMOOPS
- mmio_resource(dev, index++, CONFIG_CHROMEOS_RAMOOPS_RAM_START >> 10,
+ reserved_ram_resource(dev, index++,
+ CONFIG_CHROMEOS_RAMOOPS_RAM_START >> 10,
CONFIG_CHROMEOS_RAMOOPS_RAM_SIZE >> 10);
#endif