[Xen-changelog] Make the fixmap area moveable in kernel address space.

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

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID d161c07014a3232a71f9b1d8cb2081f00fdd5f0e
# Parent  822a27d28afeab1ffdf8ca8e8e8a11de5e7c7aec
Make the fixmap area moveable in kernel address space.

From: Gerd Hoffmann <kraxel@xxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 822a27d28afe -r d161c07014a3 
linux-2.6-xen-sparse/arch/i386/mm/pgtable-xen.c
--- a/linux-2.6-xen-sparse/arch/i386/mm/pgtable-xen.c   Thu Feb 23 15:22:19 2006
+++ b/linux-2.6-xen-sparse/arch/i386/mm/pgtable-xen.c   Thu Feb 23 15:59:54 2006
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <linux/spinlock.h>
+#include <linux/module.h>
 
 #include <asm/system.h>
 #include <asm/pgtable.h>
@@ -184,6 +185,10 @@
        __flush_tlb_one(vaddr);
 }
 
+static int nr_fixmaps = 0;
+unsigned long __FIXADDR_TOP = (HYPERVISOR_VIRT_START - 2 * PAGE_SIZE);
+EXPORT_SYMBOL(__FIXADDR_TOP);
+
 void __set_fixmap (enum fixed_addresses idx, maddr_t phys, pgprot_t flags)
 {
        unsigned long address = __fix_to_virt(idx);
@@ -203,6 +208,13 @@
                set_pte_pfn_ma(address, phys >> PAGE_SHIFT, flags);
                break;
        }
+       nr_fixmaps++;
+}
+
+void set_fixaddr_top(unsigned long top)
+{
+       BUG_ON(nr_fixmaps > 0);
+       __FIXADDR_TOP = top - PAGE_SIZE;
 }
 
 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
diff -r 822a27d28afe -r d161c07014a3 
linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h
--- a/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h       Thu Feb 
23 15:22:19 2006
+++ b/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h       Thu Feb 
23 15:59:54 2006
@@ -20,7 +20,7 @@
  * Leave one empty page between vmalloc'ed areas and
  * the start of the fixmap.
  */
-#define __FIXADDR_TOP  (HYPERVISOR_VIRT_START - 2 * PAGE_SIZE)
+extern unsigned long __FIXADDR_TOP;
 
 #ifndef __ASSEMBLY__
 #include <linux/kernel.h>
@@ -98,8 +98,10 @@
        __end_of_fixed_addresses
 };
 
-extern void __set_fixmap(
-       enum fixed_addresses idx, maddr_t phys, pgprot_t flags);
+extern void __set_fixmap(enum fixed_addresses idx,
+                                       maddr_t phys, pgprot_t flags);
+
+extern void set_fixaddr_top(unsigned long top);
 
 #define set_fixmap(idx, phys) \
                __set_fixmap(idx, phys, PAGE_KERNEL)
diff -r 822a27d28afe -r d161c07014a3 
linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/page.h
--- a/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/page.h Thu Feb 23 
15:22:19 2006
+++ b/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/page.h Thu Feb 23 
15:59:54 2006
@@ -294,7 +294,7 @@
 
 #define PAGE_OFFSET            ((unsigned long)__PAGE_OFFSET)
 #define VMALLOC_RESERVE                ((unsigned long)__VMALLOC_RESERVE)
-#define MAXMEM                 
(HYPERVISOR_VIRT_START-__PAGE_OFFSET-__VMALLOC_RESERVE)
+#define MAXMEM                 (__FIXADDR_TOP-__PAGE_OFFSET-__VMALLOC_RESERVE)
 #define __pa(x)                        ((unsigned long)(x)-PAGE_OFFSET)
 #define __va(x)                        ((void *)((unsigned 
long)(x)+PAGE_OFFSET))
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
diff -r 822a27d28afe -r d161c07014a3 
linux-2.6-xen-sparse/include/asm-i386/mach-xen/setup_arch_post.h
--- a/linux-2.6-xen-sparse/include/asm-i386/mach-xen/setup_arch_post.h  Thu Feb 
23 15:22:19 2006
+++ b/linux-2.6-xen-sparse/include/asm-i386/mach-xen/setup_arch_post.h  Thu Feb 
23 15:59:54 2006
@@ -33,6 +33,8 @@
 
 static void __init machine_specific_arch_setup(void)
 {
+       struct xen_platform_parameters pp;
+
        HYPERVISOR_set_callbacks(
            __KERNEL_CS, (unsigned long)hypervisor_callback,
            __KERNEL_CS, (unsigned long)failsafe_callback);
@@ -40,4 +42,8 @@
        HYPERVISOR_nmi_op(XENNMI_register_callback, (unsigned long)&nmi);
 
        machine_specific_modify_cpu_capabilities(&boot_cpu_data);
+
+       if (HYPERVISOR_xen_version(XENVER_platform_parameters,
+                                  &pp) == 0)
+               set_fixaddr_top(pp.virt_start - PAGE_SIZE);
 }

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