aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/kernel/mem_user.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/kernel/mem_user.c')
-rw-r--r--arch/um/kernel/mem_user.c273
1 files changed, 0 insertions, 273 deletions
diff --git a/arch/um/kernel/mem_user.c b/arch/um/kernel/mem_user.c
deleted file mode 100644
index 4a663fd434bb..000000000000
--- a/arch/um/kernel/mem_user.c
+++ /dev/null
@@ -1,273 +0,0 @@
1/*
2 * arch/um/kernel/mem_user.c
3 *
4 * BRIEF MODULE DESCRIPTION
5 * user side memory routines for supporting IO memory inside user mode linux
6 *
7 * Copyright (C) 2001 RidgeRun, Inc.
8 * Author: RidgeRun, Inc.
9 * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
19 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
22 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
23 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * You should have received a copy of the GNU General Public License along
28 * with this program; if not, write to the Free Software Foundation, Inc.,
29 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <stddef.h>
35#include <stdarg.h>
36#include <unistd.h>
37#include <errno.h>
38#include <string.h>
39#include <fcntl.h>
40#include <sys/types.h>
41#include <sys/mman.h>
42#include "kern_util.h"
43#include "user.h"
44#include "user_util.h"
45#include "mem_user.h"
46#include "init.h"
47#include "os.h"
48#include "tempfile.h"
49#include "kern_constants.h"
50
51#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
52
53static int create_tmp_file(unsigned long len)
54{
55 int fd, err;
56 char zero;
57
58 fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
59 if(fd < 0) {
60 os_print_error(fd, "make_tempfile");
61 exit(1);
62 }
63
64 err = os_mode_fd(fd, 0777);
65 if(err < 0){
66 os_print_error(err, "os_mode_fd");
67 exit(1);
68 }
69 err = os_seek_file(fd, len);
70 if(err < 0){
71 os_print_error(err, "os_seek_file");
72 exit(1);
73 }
74 zero = 0;
75 err = os_write_file(fd, &zero, 1);
76 if(err != 1){
77 os_print_error(err, "os_write_file");
78 exit(1);
79 }
80
81 return(fd);
82}
83
84void check_tmpexec(void)
85{
86 void *addr;
87 int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
88
89 addr = mmap(NULL, UM_KERN_PAGE_SIZE,
90 PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
91 printf("Checking PROT_EXEC mmap in /tmp...");
92 fflush(stdout);
93 if(addr == MAP_FAILED){
94 err = errno;
95 perror("failed");
96 if(err == EPERM)
97 printf("/tmp must be not mounted noexec\n");
98 exit(1);
99 }
100 printf("OK\n");
101 munmap(addr, UM_KERN_PAGE_SIZE);
102
103 os_close_file(fd);
104}
105
106static int have_devanon = 0;
107
108void check_devanon(void)
109{
110 int fd;
111
112 printk("Checking for /dev/anon on the host...");
113 fd = open("/dev/anon", O_RDWR);
114 if(fd < 0){
115 printk("Not available (open failed with errno %d)\n", errno);
116 return;
117 }
118
119 printk("OK\n");
120 have_devanon = 1;
121}
122
123static int create_anon_file(unsigned long len)
124{
125 void *addr;
126 int fd;
127
128 fd = open("/dev/anon", O_RDWR);
129 if(fd < 0) {
130 os_print_error(fd, "opening /dev/anon");
131 exit(1);
132 }
133
134 addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
135 if(addr == MAP_FAILED){
136 perror("mapping physmem file");
137 exit(1);
138 }
139 munmap(addr, len);
140
141 return(fd);
142}
143
144int create_mem_file(unsigned long len)
145{
146 int err, fd;
147
148 if(have_devanon)
149 fd = create_anon_file(len);
150 else fd = create_tmp_file(len);
151
152 err = os_set_exec_close(fd, 1);
153 if(err < 0)
154 os_print_error(err, "exec_close");
155 return(fd);
156}
157
158struct iomem_region *iomem_regions = NULL;
159int iomem_size = 0;
160
161static int __init parse_iomem(char *str, int *add)
162{
163 struct iomem_region *new;
164 struct uml_stat buf;
165 char *file, *driver;
166 int fd, err, size;
167
168 driver = str;
169 file = strchr(str,',');
170 if(file == NULL){
171 printf("parse_iomem : failed to parse iomem\n");
172 goto out;
173 }
174 *file = '\0';
175 file++;
176 fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
177 if(fd < 0){
178 os_print_error(fd, "parse_iomem - Couldn't open io file");
179 goto out;
180 }
181
182 err = os_stat_fd(fd, &buf);
183 if(err < 0){
184 os_print_error(err, "parse_iomem - cannot stat_fd file");
185 goto out_close;
186 }
187
188 new = malloc(sizeof(*new));
189 if(new == NULL){
190 perror("Couldn't allocate iomem_region struct");
191 goto out_close;
192 }
193
194 size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
195
196 *new = ((struct iomem_region) { .next = iomem_regions,
197 .driver = driver,
198 .fd = fd,
199 .size = size,
200 .phys = 0,
201 .virt = 0 });
202 iomem_regions = new;
203 iomem_size += new->size + UM_KERN_PAGE_SIZE;
204
205 return(0);
206 out_close:
207 os_close_file(fd);
208 out:
209 return(1);
210}
211
212__uml_setup("iomem=", parse_iomem,
213"iomem=<name>,<file>\n"
214" Configure <file> as an IO memory region named <name>.\n\n"
215);
216
217int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
218 int must_succeed)
219{
220 int err;
221
222 err = os_protect_memory((void *) addr, len, r, w, x);
223 if(err < 0){
224 if(must_succeed)
225 panic("protect failed, err = %d", -err);
226 else return(err);
227 }
228 return(0);
229}
230
231#if 0
232/* Debugging facility for dumping stuff out to the host, avoiding the timing
233 * problems that come with printf and breakpoints.
234 * Enable in case of emergency.
235 */
236
237int logging = 1;
238int logging_fd = -1;
239
240int logging_line = 0;
241char logging_buf[512];
242
243void log(char *fmt, ...)
244{
245 va_list ap;
246 struct timeval tv;
247 struct openflags flags;
248
249 if(logging == 0) return;
250 if(logging_fd < 0){
251 flags = of_create(of_trunc(of_rdwr(OPENFLAGS())));
252 logging_fd = os_open_file("log", flags, 0644);
253 }
254 gettimeofday(&tv, NULL);
255 sprintf(logging_buf, "%d\t %u.%u ", logging_line++, tv.tv_sec,
256 tv.tv_usec);
257 va_start(ap, fmt);
258 vsprintf(&logging_buf[strlen(logging_buf)], fmt, ap);
259 va_end(ap);
260 write(logging_fd, logging_buf, strlen(logging_buf));
261}
262#endif
263
264/*
265 * Overrides for Emacs so that we follow Linus's tabbing style.
266 * Emacs will notice this stuff at the end of the file and automatically
267 * adjust the settings for this buffer only. This must remain at the end
268 * of the file.
269 * ---------------------------------------------------------------------------
270 * Local variables:
271 * c-file-style: "linux"
272 * End:
273 */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 00:06:51 -0500