copy.c revision 264095 
1/*-
2 * Copyright (c) 2013 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Benno Rice under sponsorship from
6 * the FreeBSD Foundation.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/boot/amd64/efi/copy.c 264095 2014-04-04 00:16:46Z emaste $");
31
32#include <sys/param.h>
33
34#include <stand.h>
35#include <bootstrap.h>
36
37#include <efi.h>
38#include <efilib.h>
39
40#define	STAGE_PAGES	8192	/* 32MB */
41
42EFI_PHYSICAL_ADDRESS	staging;
43int			stage_offset_set = 0;
44ssize_t			stage_offset;
45
46int
47x86_efi_copy_init(void)
48{
49	EFI_STATUS	status;
50
51	status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
52	    STAGE_PAGES, &staging);
53	if (EFI_ERROR(status)) {
54		printf("failed to allocate staging area: %d\n",
55		    status & EFI_ERROR_MASK);
56		return (status);
57	}
58
59	return (0);
60}
61
62ssize_t
63x86_efi_copyin(const void *src, vm_offset_t dest, const size_t len)
64{
65
66	if (!stage_offset_set) {
67		stage_offset = (vm_offset_t)staging - dest;
68		stage_offset_set = 1;
69	}
70
71	bcopy(src, (void *)(dest + stage_offset), len);
72	return (len);
73}
74
75ssize_t
76x86_efi_copyout(const vm_offset_t src, void *dest, const size_t len)
77{
78
79	bcopy((void *)(src + stage_offset), dest, len);
80	return (len);
81}
82
83
84ssize_t
85x86_efi_readin(const int fd, vm_offset_t dest, const size_t len)
86{
87
88	return (read(fd, (void *)(dest + stage_offset), len));
89}
90
91void
92x86_efi_copy_finish(void)
93{
94	uint64_t	*src, *dst, *last;
95
96	src = (uint64_t *)staging;
97	dst = (uint64_t *)(staging - stage_offset);
98	last = (uint64_t *)(staging + STAGE_PAGES * EFI_PAGE_SIZE);
99
100	while (src < last)
101		*dst++ = *src++;
102}
103