[Xen-changelog] Linux swiotlb now uses correct method for determining if any RAM

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 112a769787d26d8658197d0eb860603383719631
# Parent  eaaee5f43c6776400b2a59b71cdfb9351b1ebcf6
Linux swiotlb now uses correct method for determining if any RAM
is mapped above 2GB.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r eaaee5f43c67 -r 112a769787d2 Config.mk
--- a/Config.mk Mon Nov 21 14:06:49 2005
+++ b/Config.mk Mon Nov 21 15:10:19 2005
@@ -3,7 +3,7 @@
 # Currently supported architectures: x86_32, x86_64
 XEN_COMPILE_ARCH    ?= $(shell uname -m | sed -e s/i.86/x86_32/)
 XEN_TARGET_ARCH     ?= $(XEN_COMPILE_ARCH)
-XEN_TARGET_X86_PAE  ?= n
+XEN_TARGET_X86_PAE  ?= y
 
 # Tools to run on system hosting the build
 HOSTCC     = gcc
diff -r eaaee5f43c67 -r 112a769787d2 
linux-2.6-xen-sparse/arch/xen/i386/kernel/swiotlb.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/swiotlb.c       Mon Nov 21 
14:06:49 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/swiotlb.c       Mon Nov 21 
15:10:19 2005
@@ -24,6 +24,7 @@
 #include <asm/io.h>
 #include <asm/pci.h>
 #include <asm/dma.h>
+#include <asm-xen/xen-public/memory.h>
 
 #define OFFSET(val,align) ((unsigned long)((val) & ( (align) - 1)))
 
@@ -186,10 +187,10 @@
          * which we take to mean more than 2GB.
          */
        if (xen_start_info->flags & SIF_INITDOMAIN) {
-               dom0_op_t op;
-               op.cmd = DOM0_PHYSINFO;
-               if ((HYPERVISOR_dom0_op(&op) == 0) &&
-                   (op.u.physinfo.total_pages > 0x7ffff))
+               unsigned long ram_end;
+               if (HYPERVISOR_memory_op(XENMEM_maximum_ram_page, &ram_end))
+                       BUG();
+               if (ram_end > 0x7ffff)
                        swiotlb = 1;
        }
 

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