From: Antti Kantee <pooka@iki.fi>
Date: Thu, 25 Feb 2016 14:03:17 +0000 (+0000)
Subject: amd64: don't map pages before memstart
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=0bbc19f3057a83785f80ee97068096f897749f74;p=osstest%2Frumprun.git

amd64: don't map pages before memstart
---

diff --git a/platform/hw/arch/amd64/makepagetable.awk b/platform/hw/arch/amd64/makepagetable.awk
index f2edd8f..d44d017 100644
--- a/platform/hw/arch/amd64/makepagetable.awk
+++ b/platform/hw/arch/amd64/makepagetable.awk
@@ -31,13 +31,14 @@ BEGIN {
 
 	printf("/* AUTOMATICALLY GENERATED BY makepagetables.awk */\n\n");
 
-	# first level, only used for lowest 2MB, with 0 unmapped
+	# first level, only used for lowest 2MB
+	start = 0x100000
 	printf(".align 0x1000\ncpu_pt0:\n");
-	printf("\t.quad 0x0\n");
-	addr = 0x1000
-	for (i = 0; i < 0x1ff; i++) {
+	for (addr = 0; addr < start; addr += 0x1000) {
+		printf("\t.quad 0x%x\n", addr);
+	}
+	for (; addr < 0x200000; addr += 0x1000) {
 		printf("\t.quad 0x%x + 0x%x\n", addr, PG_FORALL);
-		addr += 0x1000
 	}
 
 	# second level, page directories, need full one per gig