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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,247 @@ | ||
| /* | ||
| * Exercise /dev/mem mmap cases that have been troublesome in the past | ||
| * | ||
| * (c) Copyright 2007 Hewlett-Packard Development Company, L.P. | ||
| * Bjorn Helgaas <bjorn.helgaas@hp.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| */ | ||
|
|
||
| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <sys/types.h> | ||
| #include <dirent.h> | ||
| #include <fcntl.h> | ||
| #include <fnmatch.h> | ||
| #include <string.h> | ||
| #include <sys/mman.h> | ||
| #include <sys/stat.h> | ||
| #include <unistd.h> | ||
|
|
||
| int sum; | ||
|
|
||
| int map_mem(char *path, off_t offset, size_t length, int touch) | ||
| { | ||
| int fd, rc; | ||
| void *addr; | ||
| int *c; | ||
|
|
||
| fd = open(path, O_RDWR); | ||
| if (fd == -1) { | ||
| perror(path); | ||
| return -1; | ||
| } | ||
|
|
||
| addr = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset); | ||
| if (addr == MAP_FAILED) | ||
| return 1; | ||
|
|
||
| if (touch) { | ||
| c = (int *) addr; | ||
| while (c < (int *) (offset + length)) | ||
| sum += *c++; | ||
| } | ||
|
|
||
| rc = munmap(addr, length); | ||
| if (rc == -1) { | ||
| perror("munmap"); | ||
| return -1; | ||
| } | ||
|
|
||
| close(fd); | ||
| return 0; | ||
| } | ||
|
|
||
| int scan_sysfs(char *path, char *file, off_t offset, size_t length, int touch) | ||
| { | ||
| struct dirent **namelist; | ||
| char *name, *path2; | ||
| int i, n, r, rc, result = 0; | ||
| struct stat buf; | ||
|
|
||
| n = scandir(path, &namelist, 0, alphasort); | ||
| if (n < 0) { | ||
| perror("scandir"); | ||
| return -1; | ||
| } | ||
|
|
||
| for (i = 0; i < n; i++) { | ||
| name = namelist[i]->d_name; | ||
|
|
||
| if (fnmatch(".", name, 0) == 0) | ||
| goto skip; | ||
| if (fnmatch("..", name, 0) == 0) | ||
| goto skip; | ||
|
|
||
| path2 = malloc(strlen(path) + strlen(name) + 3); | ||
| strcpy(path2, path); | ||
| strcat(path2, "/"); | ||
| strcat(path2, name); | ||
|
|
||
| if (fnmatch(file, name, 0) == 0) { | ||
| rc = map_mem(path2, offset, length, touch); | ||
| if (rc == 0) | ||
| fprintf(stderr, "PASS: %s 0x%lx-0x%lx is %s\n", path2, offset, offset + length, touch ? "readable" : "mappable"); | ||
| else if (rc > 0) | ||
| fprintf(stderr, "PASS: %s 0x%lx-0x%lx not mappable\n", path2, offset, offset + length); | ||
| else { | ||
| fprintf(stderr, "FAIL: %s 0x%lx-0x%lx not accessible\n", path2, offset, offset + length); | ||
| return rc; | ||
| } | ||
| } else { | ||
| r = lstat(path2, &buf); | ||
| if (r == 0 && S_ISDIR(buf.st_mode)) { | ||
| rc = scan_sysfs(path2, file, offset, length, touch); | ||
| if (rc < 0) | ||
| return rc; | ||
| } | ||
| } | ||
|
|
||
| result |= rc; | ||
| free(path2); | ||
|
|
||
| skip: | ||
| free(namelist[i]); | ||
| } | ||
| free(namelist); | ||
| return rc; | ||
| } | ||
|
|
||
| char buf[1024]; | ||
|
|
||
| int read_rom(char *path) | ||
| { | ||
| int fd, rc; | ||
| size_t size = 0; | ||
|
|
||
| fd = open(path, O_RDWR); | ||
| if (fd == -1) { | ||
| perror(path); | ||
| return -1; | ||
| } | ||
|
|
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| rc = write(fd, "1", 2); | ||
| if (rc <= 0) { | ||
| perror("write"); | ||
| return -1; | ||
| } | ||
|
|
||
| do { | ||
| rc = read(fd, buf, sizeof(buf)); | ||
| if (rc > 0) | ||
| size += rc; | ||
| } while (rc > 0); | ||
|
|
||
| close(fd); | ||
| return size; | ||
| } | ||
|
|
||
| int scan_rom(char *path, char *file) | ||
| { | ||
| struct dirent **namelist; | ||
| char *name, *path2; | ||
| int i, n, r, rc, result = 0; | ||
| struct stat buf; | ||
|
|
||
| n = scandir(path, &namelist, 0, alphasort); | ||
| if (n < 0) { | ||
| perror("scandir"); | ||
| return -1; | ||
| } | ||
|
|
||
| for (i = 0; i < n; i++) { | ||
| name = namelist[i]->d_name; | ||
|
|
||
| if (fnmatch(".", name, 0) == 0) | ||
| goto skip; | ||
| if (fnmatch("..", name, 0) == 0) | ||
| goto skip; | ||
|
|
||
| path2 = malloc(strlen(path) + strlen(name) + 3); | ||
| strcpy(path2, path); | ||
| strcat(path2, "/"); | ||
| strcat(path2, name); | ||
|
|
||
| if (fnmatch(file, name, 0) == 0) { | ||
| rc = read_rom(path2); | ||
|
|
||
| /* | ||
| * It's OK if the ROM is unreadable. Maybe there | ||
| * is no ROM, or some other error ocurred. The | ||
| * important thing is that no MCA happened. | ||
| */ | ||
| if (rc > 0) | ||
| fprintf(stderr, "PASS: %s read %ld bytes\n", path2, rc); | ||
| else { | ||
| fprintf(stderr, "PASS: %s not readable\n", path2); | ||
| return rc; | ||
| } | ||
| } else { | ||
| r = lstat(path2, &buf); | ||
| if (r == 0 && S_ISDIR(buf.st_mode)) { | ||
| rc = scan_rom(path2, file); | ||
| if (rc < 0) | ||
| return rc; | ||
| } | ||
| } | ||
|
|
||
| result |= rc; | ||
| free(path2); | ||
|
|
||
| skip: | ||
| free(namelist[i]); | ||
| } | ||
| free(namelist); | ||
| return rc; | ||
| } | ||
|
|
||
| main() | ||
| { | ||
| int rc; | ||
|
|
||
| if (map_mem("/dev/mem", 0, 0xA0000, 1) == 0) | ||
| fprintf(stderr, "PASS: /dev/mem 0x0-0xa0000 is readable\n"); | ||
| else | ||
| fprintf(stderr, "FAIL: /dev/mem 0x0-0xa0000 not accessible\n"); | ||
|
|
||
| /* | ||
| * It's not safe to blindly read the VGA frame buffer. If you know | ||
| * how to poke the card the right way, it should respond, but it's | ||
| * not safe in general. Many machines, e.g., Intel chipsets, cover | ||
| * up a non-responding card by just returning -1, but others will | ||
| * report the failure as a machine check. | ||
| */ | ||
| if (map_mem("/dev/mem", 0xA0000, 0x20000, 0) == 0) | ||
| fprintf(stderr, "PASS: /dev/mem 0xa0000-0xc0000 is mappable\n"); | ||
| else | ||
| fprintf(stderr, "FAIL: /dev/mem 0xa0000-0xc0000 not accessible\n"); | ||
|
|
||
| if (map_mem("/dev/mem", 0xC0000, 0x40000, 1) == 0) | ||
| fprintf(stderr, "PASS: /dev/mem 0xc0000-0x100000 is readable\n"); | ||
| else | ||
| fprintf(stderr, "FAIL: /dev/mem 0xc0000-0x100000 not accessible\n"); | ||
|
|
||
| /* | ||
| * Often you can map all the individual pieces above (0-0xA0000, | ||
| * 0xA0000-0xC0000, and 0xC0000-0x100000), but can't map the whole | ||
| * thing at once. This is because the individual pieces use different | ||
| * attributes, and there's no single attribute supported over the | ||
| * whole region. | ||
| */ | ||
| rc = map_mem("/dev/mem", 0, 1024*1024, 0); | ||
| if (rc == 0) | ||
| fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 is mappable\n"); | ||
| else if (rc > 0) | ||
| fprintf(stderr, "PASS: /dev/mem 0x0-0x100000 not mappable\n"); | ||
| else | ||
| fprintf(stderr, "FAIL: /dev/mem 0x0-0x100000 not accessible\n"); | ||
|
|
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| scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1); | ||
| scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0); | ||
| scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1); | ||
| scan_sysfs("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0); | ||
|
|
||
| scan_rom("/sys/devices", "rom"); | ||
| } |
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