Enable pci mmcfg and ATS for x86_64

This patch enables PCI MMCONFIG in xen and turns on hooks for ATS.

Signed-off-by: Allen Kay <allen.m.kay@intel.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/xen/arch/x86/e820.c b/xen/arch/x86/e820.c
index c496e377d1..db258ecc82 100644
--- a/xen/arch/x86/e820.c
+++ b/xen/arch/x86/e820.c
@@ -25,6 +25,40 @@ boolean_param("e820-verbose", e820_verbose);
 
 struct e820map e820;
 
+/*
+ * This function checks if the entire range <start,end> is mapped with type.
+ *
+ * Note: this function only works correct if the e820 table is sorted and
+ * not-overlapping, which is the case
+ */
+int __init e820_all_mapped(u64 start, u64 end, unsigned type)
+{
+	int i;
+
+	for (i = 0; i < e820.nr_map; i++) {
+		struct e820entry *ei = &e820.map[i];
+
+		if (type && ei->type != type)
+			continue;
+		/* is the region (part) in overlap with the current region ?*/
+		if (ei->addr >= end || ei->addr + ei->size <= start)
+			continue;
+
+		/* if the region is at the beginning of <start,end> we move
+		 * start to the end of the region since it's ok until there
+		 */
+		if (ei->addr <= start)
+			start = ei->addr + ei->size;
+		/*
+		 * if start is now at or beyond end, we're done, full
+		 * coverage
+		 */
+		if (start >= end)
+			return 1;
+	}
+	return 0;
+}
+
 static void __init add_memory_region(unsigned long long start,
                                      unsigned long long size, int type)
 {