summaryrefslogtreecommitdiffstats
path: root/Documentation/ia64/aliasing-test.c
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/ia64/aliasing-test.c')
-rw-r--r--Documentation/ia64/aliasing-test.c262
1 files changed, 0 insertions, 262 deletions
diff --git a/Documentation/ia64/aliasing-test.c b/Documentation/ia64/aliasing-test.c
deleted file mode 100644
index 5caa2af..0000000
--- a/Documentation/ia64/aliasing-test.c
+++ /dev/null
@@ -1,262 +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) {
- 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;
-}