[Xen-ia64-devel] [PATCH 15/28] ia64/xen: define xen_alloc_vm_area()/xen_free_vm_area() for ia64 arch.

[yamahata@xxxxxxxxxxxxx]

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/xen/util.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 101 insertions(+), 0 deletions(-)
 create mode 100644 arch/ia64/xen/util.c

diff --git a/arch/ia64/xen/util.c b/arch/ia64/xen/util.c
new file mode 100644
index 0000000..242a1a4
--- /dev/null
+++ b/arch/ia64/xen/util.c
@@ -0,0 +1,101 @@
+/******************************************************************************
+ * arch/ia64/xen/util.c
+ * This file is the ia64 counterpart of drivers/xen/util.c
+ *
+ * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <xen/interface/memory.h>
+#include <asm/xen/hypercall.h>
+
+struct vm_struct *xen_alloc_vm_area(unsigned long size)
+{
+       int order;
+       unsigned long virt;
+       unsigned long nr_pages;
+       struct vm_struct *area;
+
+       order = get_order(size);
+       virt = __get_free_pages(GFP_KERNEL, order);
+       if (virt == 0)
+               goto err0;
+       nr_pages = 1 << order;
+       scrub_pages(virt, nr_pages);
+
+       area = kmalloc(sizeof(*area), GFP_KERNEL);
+       if (area == NULL)
+               goto err1;
+
+       area->flags = VM_IOREMAP;
+       area->addr = (void *)virt;
+       area->size = size;
+       area->pages = NULL;
+       area->nr_pages = nr_pages;
+       area->phys_addr = 0;    /* xenbus_map_ring_valloc uses this field!  */
+
+       return area;
+
+err1:
+       free_pages(virt, order);
+err0:
+       return NULL;
+}
+EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
+
+void xen_free_vm_area(struct vm_struct *area)
+{
+       unsigned int order = get_order(area->size);
+       unsigned long i;
+       unsigned long phys_addr = __pa(area->addr);
+
+       /* This area is used for foreign page mappping.
+        * So underlying machine page may not be assigned. */
+       for (i = 0; i < (1 << order); i++) {
+               unsigned long ret;
+               unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
+               struct xen_memory_reservation reservation = {
+                       .nr_extents   = 1,
+                       .address_bits = 0,
+                       .extent_order = 0,
+                       .domid        = DOMID_SELF
+               };
+               set_xen_guest_handle(reservation.extent_start, &gpfn);
+               ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
+                                          &reservation);
+               BUG_ON(ret != 1);
+       }
+       free_pages((unsigned long)area->addr, order);
+       kfree(area);
+}
+EXPORT_SYMBOL_GPL(xen_free_vm_area);
+
+/*
+ * Local variables:
+ *  c-file-style: "linux"
+ *  indent-tabs-mode: t
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ *  tab-width: 8
+ * End:
+ */
-- 
1.5.3

-- 
yamahata

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