* [PATCH][XEN][POWERPC] xencomm common code
[not found] <1165344436.11779.27.camel@basalt>
@ 2006-12-08 20:25 ` Hollis Blanchard
2006-12-08 20:25 ` [PATCH][XEN][POWERPC] avoid xc_get_tot_pages() in the prose builder Hollis Blanchard
2006-12-08 20:25 ` [PATCH][XEN][POWERPC] allocate shadow memory for PPC Linux domains Hollis Blanchard
2 siblings, 0 replies; 5+ messages in thread
From: Hollis Blanchard @ 2006-12-08 20:25 UTC (permalink / raw)
To: Keir Fraser; +Cc: xen-devel, xen-ppc-devel
[-- Attachment #1.1: Type: text/plain, Size: 21812 bytes --]
Move xencomm code out of arch/powerpc so it can be shared with other
architectures. Currently it is only built for PowerPC, leaving IA64's
fork untouched.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
diff -r 9d83185b4c37 xen/common/xencomm.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/common/xencomm.c Wed Sep 13 10:04:10 2006 -0600
@@ -0,0 +1,316 @@
+/*
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) IBM Corp. 2006
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ * Tristan Gingold <tristan.gingold@bull.net>
+ */
+
+#include <xen/config.h>
+#include <xen/mm.h>
+#include <xen/sched.h>
+#include <xen/xencomm.h>
+#include <public/xen.h>
+#include <public/xencomm.h>
+
+
+#undef DEBUG
+#ifdef DEBUG
+static int xencomm_debug = 1; /* extremely verbose */
+#else
+#define xencomm_debug 0
+#endif
+
+static unsigned long
+xencomm_inline_from_guest(void *to, const void *from, unsigned int n,
+ unsigned int skip)
+{
+ unsigned long src_paddr = xencomm_inline_addr(from);
+
+ src_paddr += skip;
+
+ while (n > 0) {
+ unsigned int chunksz;
+ unsigned long src_maddr;
+ unsigned int bytes;
+
+ chunksz = PAGE_SIZE - (src_paddr % PAGE_SIZE);
+
+ bytes = min(chunksz, n);
+
+ src_maddr = paddr_to_maddr(src_paddr);
+ if (xencomm_debug)
+ printk("%lx[%d] -> %lx\n", src_maddr, bytes, (unsigned long)to);
+ memcpy(to, (void *)src_maddr, bytes);
+ src_paddr += bytes;
+ to += bytes;
+ n -= bytes;
+ }
+
+ /* Always successful. */
+ return 0;
+}
+
+/**
+ * xencomm_copy_from_guest: Copy a block of data from domain space.
+ * @to: Machine address.
+ * @from: Physical address to a xencomm buffer descriptor.
+ * @n: Number of bytes to copy.
+ * @skip: Number of bytes from the start to skip.
+ *
+ * Copy data from domain to hypervisor.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+unsigned long
+xencomm_copy_from_guest(void *to, const void *from, unsigned int n,
+ unsigned int skip)
+{
+ struct xencomm_desc *desc;
+ unsigned int from_pos = 0;
+ unsigned int to_pos = 0;
+ unsigned int i = 0;
+
+ if (xencomm_is_inline(from))
+ return xencomm_inline_from_guest(to, from, n, skip);
+
+ /* first we need to access the descriptor */
+ desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)from);
+ if (desc == NULL)
+ return n;
+
+ if (desc->magic != XENCOMM_MAGIC) {
+ printk("%s: error: %p magic was 0x%x\n",
+ __func__, desc, desc->magic);
+ return n;
+ }
+
+ /* iterate through the descriptor, copying up to a page at a time */
+ while ((to_pos < n) && (i < desc->nr_addrs)) {
+ unsigned long src_paddr = desc->address[i];
+ unsigned int pgoffset;
+ unsigned int chunksz;
+ unsigned int chunk_skip;
+
+ if (src_paddr == XENCOMM_INVALID) {
+ i++;
+ continue;
+ }
+
+ pgoffset = src_paddr % PAGE_SIZE;
+ chunksz = PAGE_SIZE - pgoffset;
+
+ chunk_skip = min(chunksz, skip);
+ from_pos += chunk_skip;
+ chunksz -= chunk_skip;
+ skip -= chunk_skip;
+
+ if (skip == 0) {
+ unsigned long src_maddr;
+ unsigned long dest = (unsigned long)to + to_pos;
+ unsigned int bytes = min(chunksz, n - to_pos);
+
+ src_maddr = paddr_to_maddr(src_paddr + chunk_skip);
+ if (src_maddr == 0)
+ return n - to_pos;
+
+ if (xencomm_debug)
+ printk("%lx[%d] -> %lx\n", src_maddr, bytes, dest);
+ memcpy((void *)dest, (void *)src_maddr, bytes);
+ from_pos += bytes;
+ to_pos += bytes;
+ }
+
+ i++;
+ }
+
+ return n - to_pos;
+}
+
+static unsigned long
+xencomm_inline_to_guest(void *to, const void *from, unsigned int n,
+ unsigned int skip)
+{
+ unsigned long dest_paddr = xencomm_inline_addr(to);
+
+ dest_paddr += skip;
+
+ while (n > 0) {
+ unsigned int chunksz;
+ unsigned long dest_maddr;
+ unsigned int bytes;
+
+ chunksz = PAGE_SIZE - (dest_paddr % PAGE_SIZE);
+
+ bytes = min(chunksz, n);
+
+ dest_maddr = paddr_to_maddr(dest_paddr);
+ if (xencomm_debug)
+ printk("%lx[%d] -> %lx\n", (unsigned long)from, bytes, dest_maddr);
+ memcpy((void *)dest_maddr, (void *)from, bytes);
+ dest_paddr += bytes;
+ from += bytes;
+ n -= bytes;
+ }
+
+ /* Always successful. */
+ return 0;
+}
+
+/**
+ * xencomm_copy_to_guest: Copy a block of data to domain space.
+ * @to: Physical address to xencomm buffer descriptor.
+ * @from: Machine address.
+ * @n: Number of bytes to copy.
+ * @skip: Number of bytes from the start to skip.
+ *
+ * Copy data from hypervisor to domain.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+unsigned long
+xencomm_copy_to_guest(void *to, const void *from, unsigned int n,
+ unsigned int skip)
+{
+ struct xencomm_desc *desc;
+ unsigned int from_pos = 0;
+ unsigned int to_pos = 0;
+ unsigned int i = 0;
+
+ if (xencomm_is_inline(to))
+ return xencomm_inline_to_guest(to, from, n, skip);
+
+ /* first we need to access the descriptor */
+ desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)to);
+ if (desc == NULL)
+ return n;
+
+ if (desc->magic != XENCOMM_MAGIC) {
+ printk("%s error: %p magic was 0x%x\n", __func__, desc, desc->magic);
+ return n;
+ }
+
+ /* iterate through the descriptor, copying up to a page at a time */
+ while ((from_pos < n) && (i < desc->nr_addrs)) {
+ unsigned long dest_paddr = desc->address[i];
+ unsigned int pgoffset;
+ unsigned int chunksz;
+ unsigned int chunk_skip;
+
+ if (dest_paddr == XENCOMM_INVALID) {
+ i++;
+ continue;
+ }
+
+ pgoffset = dest_paddr % PAGE_SIZE;
+ chunksz = PAGE_SIZE - pgoffset;
+
+ chunk_skip = min(chunksz, skip);
+ to_pos += chunk_skip;
+ chunksz -= chunk_skip;
+ skip -= chunk_skip;
+
+ if (skip == 0) {
+ unsigned long dest_maddr;
+ unsigned long source = (unsigned long)from + from_pos;
+ unsigned int bytes = min(chunksz, n - from_pos);
+
+ dest_maddr = paddr_to_maddr(dest_paddr + chunk_skip);
+ if (dest_maddr == 0)
+ return -1;
+
+ if (xencomm_debug)
+ printk("%lx[%d] -> %lx\n", source, bytes, dest_maddr);
+ memcpy((void *)dest_maddr, (void *)source, bytes);
+ from_pos += bytes;
+ to_pos += bytes;
+ }
+
+ i++;
+ }
+
+ return n - from_pos;
+}
+
+static int xencomm_inline_add_offset(void **handle, unsigned int bytes)
+{
+ *handle += bytes;
+ return 0;
+}
+
+/* Offset page addresses in 'handle' to skip 'bytes' bytes. Set completely
+ * exhausted pages to XENCOMM_INVALID. */
+int xencomm_add_offset(void **handle, unsigned int bytes)
+{
+ struct xencomm_desc *desc;
+ int i = 0;
+
+ if (xencomm_is_inline(*handle))
+ return xencomm_inline_add_offset(handle, bytes);
+
+ /* first we need to access the descriptor */
+ desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)*handle);
+ if (desc == NULL)
+ return -1;
+
+ if (desc->magic != XENCOMM_MAGIC) {
+ printk("%s error: %p magic was 0x%x\n", __func__, desc, desc->magic);
+ return -1;
+ }
+
+ /* iterate through the descriptor incrementing addresses */
+ while ((bytes > 0) && (i < desc->nr_addrs)) {
+ unsigned long dest_paddr = desc->address[i];
+ unsigned int pgoffset;
+ unsigned int chunksz;
+ unsigned int chunk_skip;
+
+ pgoffset = dest_paddr % PAGE_SIZE;
+ chunksz = PAGE_SIZE - pgoffset;
+
+ chunk_skip = min(chunksz, bytes);
+ if (chunk_skip == chunksz) {
+ /* exhausted this page */
+ desc->address[i] = XENCOMM_INVALID;
+ } else {
+ desc->address[i] += chunk_skip;
+ }
+ bytes -= chunk_skip;
+ }
+ return 0;
+}
+
+int xencomm_handle_is_null(void *handle)
+{
+ struct xencomm_desc *desc;
+ int i;
+
+ if (xencomm_is_inline(handle))
+ return xencomm_inline_addr(handle) == 0;
+
+ desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)handle);
+ if (desc == NULL)
+ return 1;
+
+ for (i = 0; i < desc->nr_addrs; i++)
+ if (desc->address[i] != XENCOMM_INVALID)
+ return 0;
+
+ return 1;
+}
+
diff -r 9d83185b4c37 xen/include/xen/xencomm.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/xen/xencomm.h Wed Sep 13 10:04:10 2006 -0600
@@ -0,0 +1,115 @@
+/*
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) IBM Corp. 2006
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+#ifndef __XENCOMM_H__
+#define __XENCOMM_H__
+
+#include <public/xen.h>
+
+extern unsigned long xencomm_copy_to_guest(void *to, const void *from,
+ unsigned int len, unsigned int skip);
+extern unsigned long xencomm_copy_from_guest(void *to, const void *from,
+ unsigned int len, unsigned int skip);
+extern int xencomm_add_offset(void **handle, unsigned int bytes);
+extern int xencomm_handle_is_null(void *ptr);
+
+
+static inline int xencomm_is_inline(const void *handle)
+{
+ unsigned long addr = (unsigned long)handle;
+ return (addr & XENCOMM_INLINE_FLAG) == XENCOMM_INLINE_FLAG;
+}
+
+static inline unsigned long xencomm_inline_addr(const void *handle)
+{
+ return (unsigned long)handle & ~XENCOMM_INLINE_FLAG;
+}
+
+/* Is the guest handle a NULL reference? */
+#define guest_handle_is_null(hnd) \
+ ((hnd).p == NULL || xencomm_handle_is_null((hnd).p))
+
+/* Offset the given guest handle into the array it refers to. */
+#define guest_handle_add_offset(hnd, nr) ({ \
+ const typeof((hnd).p) _ptr; \
+ xencomm_add_offset((void **)&((hnd).p), nr * sizeof(*_ptr)); \
+})
+
+/* Cast a guest handle to the specified type of handle. */
+#define guest_handle_cast(hnd, type) ({ \
+ type *_x = (hnd).p; \
+ XEN_GUEST_HANDLE(type) _y; \
+ set_xen_guest_handle(_y, _x); \
+ _y; \
+})
+
+/* Since we run in real mode, we can safely access all addresses. That also
+ * means our __routines are identical to our "normal" routines. */
+#define guest_handle_okay(hnd, nr) 1
+
+/*
+ * Copy an array of objects to guest context via a guest handle.
+ * Optionally specify an offset into the guest array.
+ */
+#define copy_to_guest_offset(hnd, idx, ptr, nr) \
+ __copy_to_guest_offset(hnd, idx, ptr, nr)
+
+/* Copy sub-field of a structure to guest context via a guest handle. */
+#define copy_field_to_guest(hnd, ptr, field) \
+ __copy_field_to_guest(hnd, ptr, field)
+
+/*
+ * Copy an array of objects from guest context via a guest handle.
+ * Optionally specify an offset into the guest array.
+ */
+#define copy_from_guest_offset(ptr, hnd, idx, nr) \
+ __copy_from_guest_offset(ptr, hnd, idx, nr)
+
+/* Copy sub-field of a structure from guest context via a guest handle. */
+#define copy_field_from_guest(ptr, hnd, field) \
+ __copy_field_from_guest(ptr, hnd, field)
+
+#define __copy_to_guest_offset(hnd, idx, ptr, nr) ({ \
+ const typeof(ptr) _x = (hnd).p; \
+ const typeof(ptr) _y = (ptr); \
+ xencomm_copy_to_guest(_x, _y, sizeof(*_x)*(nr), sizeof(*_x)*(idx)); \
+})
+
+#define __copy_field_to_guest(hnd, ptr, field) ({ \
+ const int _off = offsetof(typeof(*ptr), field); \
+ const typeof(&(ptr)->field) _x = &(hnd).p->field; \
+ const typeof(&(ptr)->field) _y = &(ptr)->field; \
+ xencomm_copy_to_guest(_x, _y, sizeof(*_x), sizeof(*_x)*(_off)); \
+})
+
+#define __copy_from_guest_offset(ptr, hnd, idx, nr) ({ \
+ const typeof(ptr) _x = (hnd).p; \
+ const typeof(ptr) _y = (ptr); \
+ xencomm_copy_from_guest(_y, _x, sizeof(*_x)*(nr), sizeof(*_x)*(idx)); \
+})
+
+#define __copy_field_from_guest(ptr, hnd, field) ({ \
+ const int _off = offsetof(typeof(*ptr), field); \
+ const typeof(&(ptr)->field) _x = &(hnd).p->field; \
+ const typeof(&(ptr)->field) _y = &(ptr)->field; \
+ xencomm_copy_to_guest(_y, _x, sizeof(*_x), sizeof(*_x)*(_off)); \
+})
+
+#endif /* __XENCOMM_H__ */
diff -r 9d83185b4c37 xen/common/Makefile
--- a/xen/common/Makefile Fri Dec 01 19:11:02 2006 -0500
+++ b/xen/common/Makefile Tue Dec 05 12:56:32 2006 -0600
@@ -31,5 +31,7 @@ obj-$(crash_debug) += gdbstub.o
obj-$(crash_debug) += gdbstub.o
obj-$(xenoprof) += xenoprof.o
+obj-$(CONFIG_XENCOMM) += xencomm.o
+
# Object file contains changeset and compiler information.
version.o: $(BASEDIR)/include/xen/compile.h
diff -r 9d83185b4c37 config/powerpc64.mk
--- a/config/powerpc64.mk Fri Dec 01 19:11:02 2006 -0500
+++ b/config/powerpc64.mk Tue Dec 05 12:56:11 2006 -0600
@@ -1,5 +1,7 @@ CONFIG_POWERPC := y
CONFIG_POWERPC := y
CONFIG_POWERPC_$(XEN_OS) := y
+CONFIG_XENCOMM := y
+
CFLAGS += -DELFSIZE=64
LIBDIR := lib
diff -r 9d83185b4c37 xen/arch/powerpc/usercopy.c
--- a/xen/arch/powerpc/usercopy.c Fri Dec 01 19:11:02 2006 -0500
+++ b/xen/arch/powerpc/usercopy.c Fri Dec 01 17:18:45 2006 -0600
@@ -18,24 +18,14 @@
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
-#include <xen/config.h>
-#include <xen/mm.h>
#include <xen/sched.h>
+#include <xen/lib.h>
#include <asm/current.h>
-#include <asm/uaccess.h>
+#include <asm/page.h>
#include <asm/debugger.h>
-#include <public/xen.h>
-#include <public/xencomm.h>
-
-#undef DEBUG
-#ifdef DEBUG
-static int xencomm_debug = 1; /* extremely verbose */
-#else
-#define xencomm_debug 0
-#endif
/* XXX need to return error, not panic, if domain passed a bad pointer */
-static unsigned long paddr_to_maddr(unsigned long paddr)
+unsigned long paddr_to_maddr(unsigned long paddr)
{
struct vcpu *v = get_current();
struct domain *d = v->domain;
@@ -58,208 +48,3 @@ static unsigned long paddr_to_maddr(unsi
return pa;
}
-
-/**
- * xencomm_copy_from_guest: Copy a block of data from domain space.
- * @to: Machine address.
- * @from: Physical address to a xencomm buffer descriptor.
- * @n: Number of bytes to copy.
- * @skip: Number of bytes from the start to skip.
- *
- * Copy data from domain to hypervisor.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-unsigned long
-xencomm_copy_from_guest(void *to, const void *from, unsigned int n,
- unsigned int skip)
-{
- struct xencomm_desc *desc;
- unsigned int from_pos = 0;
- unsigned int to_pos = 0;
- unsigned int i = 0;
-
- /* first we need to access the descriptor */
- desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)from);
- if (desc == NULL)
- return n;
-
- if (desc->magic != XENCOMM_MAGIC) {
- printk("%s: error: %p magic was 0x%x\n",
- __func__, desc, desc->magic);
- return n;
- }
-
- /* iterate through the descriptor, copying up to a page at a time */
- while ((to_pos < n) && (i < desc->nr_addrs)) {
- unsigned long src_paddr = desc->address[i];
- unsigned int pgoffset;
- unsigned int chunksz;
- unsigned int chunk_skip;
-
- if (src_paddr == XENCOMM_INVALID) {
- i++;
- continue;
- }
-
- pgoffset = src_paddr % PAGE_SIZE;
- chunksz = PAGE_SIZE - pgoffset;
-
- chunk_skip = min(chunksz, skip);
- from_pos += chunk_skip;
- chunksz -= chunk_skip;
- skip -= chunk_skip;
-
- if (skip == 0) {
- unsigned long src_maddr;
- unsigned long dest = (unsigned long)to + to_pos;
- unsigned int bytes = min(chunksz, n - to_pos);
-
- src_maddr = paddr_to_maddr(src_paddr + chunk_skip);
- if (src_maddr == 0)
- return n - to_pos;
-
- if (xencomm_debug)
- printk("%lx[%d] -> %lx\n", src_maddr, bytes, dest);
- memcpy((void *)dest, (void *)src_maddr, bytes);
- from_pos += bytes;
- to_pos += bytes;
- }
-
- i++;
- }
-
- return n - to_pos;
-}
-
-/**
- * xencomm_copy_to_guest: Copy a block of data to domain space.
- * @to: Physical address to xencomm buffer descriptor.
- * @from: Machine address.
- * @n: Number of bytes to copy.
- * @skip: Number of bytes from the start to skip.
- *
- * Copy data from hypervisor to domain.
- *
- * Returns number of bytes that could not be copied.
- * On success, this will be zero.
- */
-unsigned long
-xencomm_copy_to_guest(void *to, const void *from, unsigned int n,
- unsigned int skip)
-{
- struct xencomm_desc *desc;
- unsigned int from_pos = 0;
- unsigned int to_pos = 0;
- unsigned int i = 0;
-
- /* first we need to access the descriptor */
- desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)to);
- if (desc == NULL)
- return n;
-
- if (desc->magic != XENCOMM_MAGIC) {
- printk("%s error: %p magic was 0x%x\n", __func__, desc, desc->magic);
- return n;
- }
-
- /* iterate through the descriptor, copying up to a page at a time */
- while ((from_pos < n) && (i < desc->nr_addrs)) {
- unsigned long dest_paddr = desc->address[i];
- unsigned int pgoffset;
- unsigned int chunksz;
- unsigned int chunk_skip;
-
- if (dest_paddr == XENCOMM_INVALID) {
- i++;
- continue;
- }
-
- pgoffset = dest_paddr % PAGE_SIZE;
- chunksz = PAGE_SIZE - pgoffset;
-
- chunk_skip = min(chunksz, skip);
- to_pos += chunk_skip;
- chunksz -= chunk_skip;
- skip -= chunk_skip;
-
- if (skip == 0) {
- unsigned long dest_maddr;
- unsigned long source = (unsigned long)from + from_pos;
- unsigned int bytes = min(chunksz, n - from_pos);
-
- dest_maddr = paddr_to_maddr(dest_paddr + chunk_skip);
- if (dest_maddr == 0)
- return -1;
-
- if (xencomm_debug)
- printk("%lx[%d] -> %lx\n", source, bytes, dest_maddr);
- memcpy((void *)dest_maddr, (void *)source, bytes);
- from_pos += bytes;
- to_pos += bytes;
- }
-
- i++;
- }
-
- return n - from_pos;
-}
-
-/* Offset page addresses in 'handle' to skip 'bytes' bytes. Set completely
- * exhausted pages to XENCOMM_INVALID. */
-int xencomm_add_offset(void *handle, unsigned int bytes)
-{
- struct xencomm_desc *desc;
- int i = 0;
-
- /* first we need to access the descriptor */
- desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)handle);
- if (desc == NULL)
- return -1;
-
- if (desc->magic != XENCOMM_MAGIC) {
- printk("%s error: %p magic was 0x%x\n", __func__, desc, desc->magic);
- return -1;
- }
-
- /* iterate through the descriptor incrementing addresses */
- while ((bytes > 0) && (i < desc->nr_addrs)) {
- unsigned long dest_paddr = desc->address[i];
- unsigned int pgoffset;
- unsigned int chunksz;
- unsigned int chunk_skip;
-
- if (dest_paddr == XENCOMM_INVALID) {
- i++;
- continue;
- }
-
- pgoffset = dest_paddr % PAGE_SIZE;
- chunksz = PAGE_SIZE - pgoffset;
-
- chunk_skip = min(chunksz, bytes);
- if (chunk_skip == chunksz) {
- /* exhausted this page */
- desc->address[i] = XENCOMM_INVALID;
- } else {
- desc->address[i] += chunk_skip;
- }
- bytes -= chunk_skip;
-
- i++;
- }
- return 0;
-}
-
-int xencomm_handle_is_null(void *ptr)
-{
- struct xencomm_desc *desc;
-
- desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)ptr);
- if (desc == NULL)
- return 1;
-
- return (desc->nr_addrs == 0);
-}
-
--
Hollis Blanchard
IBM Linux Technology Center
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