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Diffstat (limited to 'Documentation/ia64/aliasing-test.c')
| -rw-r--r-- | Documentation/ia64/aliasing-test.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c deleted file mode 100644 index 62a190d..0000000 --- a/Documentation/ia64/aliasing-test.c +++ /dev/null @@ -1,263 +0,0 @@ -/* - * 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/ioctl.h> -#include <sys/mman.h> -#include <sys/stat.h> -#include <unistd.h> -#include <linux/pci.h> - -int sum; - -static 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; - } - - if (fnmatch("/proc/bus/pci/*", path, 0) == 0) { - rc = ioctl(fd, PCIIOC_MMAP_IS_MEM); - if (rc == -1) - perror("PCIIOC_MMAP_IS_MEM ioctl"); - } - - 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 *) (addr + length)) - sum += *c++; - } - - rc = munmap(addr, length); - if (rc == -1) { - perror("munmap"); - return -1; - } - - close(fd); - return 0; -} - -static int scan_tree(char *path, char *file, off_t offset, size_t length, int touch) -{ - struct dirent **namelist; - char *name, *path2; - int i, n, r, rc = 0, 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_tree(path2, file, offset, length, touch); - if (rc < 0) - return rc; - } - } - - result |= rc; - free(path2); - -skip: - free(namelist[i]); - } - free(namelist); - return result; -} - -char buf[1024]; - -static int read_rom(char *path) -{ - int fd, rc; - size_t size = 0; - - fd = open(path, O_RDWR); - if (fd == -1) { - perror(path); - return -1; - } - - rc = write(fd, "1", 2); - if (rc <= 0) { - close(fd); - perror("write"); - return -1; - } - - do { - rc = read(fd, buf, sizeof(buf)); - if (rc > 0) - size += rc; - } while (rc > 0); - - close(fd); - return size; -} - -static int scan_rom(char *path, char *file) -{ - struct dirent **namelist; - char *name, *path2; - int i, n, r, rc = 0, 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 occurred. The - * important thing is that no MCA happened. - */ - if (rc > 0) - fprintf(stderr, "PASS: %s read %d 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 result; -} - -int main(void) -{ - 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"); - - scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 0xA0000, 1); - scan_tree("/sys/class/pci_bus", "legacy_mem", 0xA0000, 0x20000, 0); - scan_tree("/sys/class/pci_bus", "legacy_mem", 0xC0000, 0x40000, 1); - scan_tree("/sys/class/pci_bus", "legacy_mem", 0, 1024*1024, 0); - - scan_rom("/sys/devices", "rom"); - - scan_tree("/proc/bus/pci", "??.?", 0, 0xA0000, 1); - scan_tree("/proc/bus/pci", "??.?", 0xA0000, 0x20000, 0); - scan_tree("/proc/bus/pci", "??.?", 0xC0000, 0x40000, 1); - scan_tree("/proc/bus/pci", "??.?", 0, 1024*1024, 0); - - return rc; -} |
