[2/5] x86: avoid BIOS area when allocating address space

Commit Message

Bjorn Helgaas Dec. 8, 2010, 9:36 p.m. UTC

None

Patch

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9e13763..1e99475 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 0000000..5dd6473
--- /dev/null
+++ b/arch/x86/kernel/resource.c
@@ -0,0 +1,14 @@ 
+#include <linux/ioport.h>
+#include <asm/e820.h>
+
+void arch_remove_reservations(struct resource *avail)
+{
+	/*
+	 * Trim out the area reserved for BIOS (low 1MB).  We could also remove
+	 * E820 "reserved" areas here.
+	 */
+	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 c4bb261..b261011 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -77,9 +77,6 @@  pcibios_align_resource(void *data, const struct resource *res,
 		 */
 		if (!skip_isa_ioresource_align(dev))
 			start &= ~0x300;
-	} else if (res->flags & IORESOURCE_MEM) {
-		if (start < BIOS_END)
-			start = res->end;	/* fail; no space */
 	}
 	return start;
 }