summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/resource.c
diff options
context:
space:
mode:
authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-12-16 10:38:51 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-12-17 10:01:17 -0800
commit30919b0bf356a8ee0ef4f7d38ca8ad99b96820b2 (patch)
tree64b2e760eb636b8ccc198344964358695c74b9d3 /arch/x86/kernel/resource.c
parentfcb119183c73bf0781009713f303e28b1fb13d3e (diff)
x86: avoid low BIOS area when allocating address space
This implements arch_remove_reservations() so allocate_resource() can avoid any arch-specific reserved areas. This currently just avoids the BIOS area (the first 1MB), but could be used for E820 reserved areas if that turns out to be necessary. We previously avoided this area in pcibios_align_resource(). This patch moves the test from that PCI-specific path to a generic path, so *all* resource allocations will avoid this area. Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86/kernel/resource.c')
-rw-r--r--arch/x86/kernel/resource.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
new file mode 100644
index 00000000000..407a900da9d
--- /dev/null
+++ b/arch/x86/kernel/resource.c
@@ -0,0 +1,11 @@
+#include <linux/ioport.h>
+#include <asm/e820.h>
+
+void arch_remove_reservations(struct resource *avail)
+{
+ /* Trim out BIOS area (low 1MB) */
+ if (avail->flags & IORESOURCE_MEM) {
+ if (avail->start < BIOS_END)
+ avail->start = BIOS_END;
+ }
+}