1 /* $NetBSD: xenmem.c,v 1.5 2023/12/20 15:34:46 thorpej Exp $ */
2 /*
3 * Copyright (c) 2022 Manuel Bouyer.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 */
26
27 #include <sys/cdefs.h>
28 __KERNEL_RCSID(0, "$NetBSD: xenmem.c,v 1.5 2023/12/20 15:34:46 thorpej Exp $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/extent.h>
33 #include <sys/kmem.h>
34 #include <uvm/uvm_physseg.h>
35
36 #include <xen/xenmem.h>
37
38 /*
39 * Xen physical space management
40 * The xenmem_ex extent manage the VM's pseudo-physical memory space.
41 * This contains the m�mory allocated to the VM, and is also used to allocate
42 * extra physical space used for XENMEM_add_to_physmap (in come cases)
43 * In the !XENPV case, the physical space is managed by bus_space, so
44 * we reuse the iomem_ex
45 */
46
47 extern struct extent *iomem_ex;
48 #define XENMEM_EX iomem_ex
49
50 paddr_t
xenmem_alloc_pa(u_long size,u_long align,bool waitok)51 xenmem_alloc_pa(u_long size, u_long align, bool waitok)
52 {
53 u_long result;
54 int error;
55
56 #ifdef _LP64
57 /* allocate above the 4Gb range to not collide wit devices */
58 error = extent_alloc_subregion(XENMEM_EX, 0x100000000UL, MAXIOMEM,
59 size, align, 0,
60 (waitok ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT) | EX_MALLOCOK,
61 &result);
62 #else
63 error = extent_alloc(XENMEM_EX, size, align, 0,
64 (waitok ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT) | EX_MALLOCOK,
65 &result);
66 #endif
67 if (error) {
68 printf("xenmem_alloc_pa: failed %d\n", error);
69 return 0;
70 }
71 return result;
72 }
73
74 void
xenmem_free_pa(paddr_t start,u_long size)75 xenmem_free_pa(paddr_t start, u_long size)
76 {
77 int error;
78 error = extent_free(XENMEM_EX, start, size, EX_NOWAIT);
79 if (error) {
80 printf("WARNING: xenmem_alloc_pa failed: %d\n", error);
81 }
82 }
83