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authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-12-16 20:38:51 +0300
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-12-17 21:01:17 +0300
commit30919b0bf356a8ee0ef4f7d38ca8ad99b96820b2 (patch)
tree64b2e760eb636b8ccc198344964358695c74b9d3 /arch
parentfcb119183c73bf0781009713f303e28b1fb13d3e (diff)
downloadlinux-30919b0bf356a8ee0ef4f7d38ca8ad99b96820b2.tar.xz
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')
-rw-r--r--arch/x86/kernel/Makefile1
-rw-r--r--arch/x86/kernel/resource.c11
-rw-r--r--arch/x86/pci/i386.c3
3 files changed, 12 insertions, 3 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9e13763b6092..1e994754d323 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -45,6 +45,7 @@ obj-y += pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o pci-nommu.o hw_breakpoint.o
obj-y += tsc.o io_delay.o rtc.o
obj-y += pci-iommu_table.o
+obj-y += resource.o
obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o
obj-y += process.o
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
new file mode 100644
index 000000000000..407a900da9df
--- /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;
+ }
+}
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 8379c2c3d076..b1805b78842f 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -72,9 +72,6 @@ pcibios_align_resource(void *data, const struct resource *res,
return start;
if (start & 0x300)
start = (start + 0x3ff) & ~0x3ff;
- } else if (res->flags & IORESOURCE_MEM) {
- if (start < BIOS_END)
- start = BIOS_END;
}
return start;
}