[PATCH] uml: move libc code out of mem_user.c and tempfile.c

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all system calls from mem_user.c and tempfile.c files under
os-Linux dir.

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

13 files changed, 300 insertions, 318 deletions

diff --git a/arch/um/include/mem_user.h b/arch/um/include/mem_user.h
index d6404bb64662..9fef4123a65a 100644
--- a/arch/um/include/mem_user.h
+++ b/arch/um/include/mem_user.h
@@ -51,7 +51,6 @@ extern unsigned long task_size;
 
 extern void check_devanon(void);
 extern int init_mem_user(void);
-extern int create_mem_file(unsigned long len);
 extern void setup_memory(void *entry);
 extern unsigned long find_iomem(char *driver, unsigned long *len_out);
 extern int init_maps(unsigned long physmem, unsigned long iomem,
@@ -64,20 +63,6 @@ extern unsigned long phys_offset(unsigned long phys);
 extern void unmap_physmem(void);
 extern void map_memory(unsigned long virt, unsigned long phys,
                        unsigned long len, int r, int w, int x);
-extern int protect_memory(unsigned long addr, unsigned long len, 
-                          int r, int w, int x, int must_succeed);
 extern unsigned long get_kmem_end(void);
-extern void check_tmpexec(void);
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 4c362458052c..583329d0a539 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -157,6 +157,9 @@ extern int os_lock_file(int fd, int excl);
 extern void os_early_checks(void);
 extern int can_do_skas(void);
 
+/* mem.c */
+extern int create_mem_file(unsigned long len);
+
 /* process.c */
 extern unsigned long os_process_pc(int pid);
 extern int os_process_parent(int pid);
@@ -181,6 +184,8 @@ extern unsigned long long os_usecs(void);
 /* tt.c
  * for tt mode only (will be deleted in future...)
  */
+extern int protect_memory(unsigned long addr, unsigned long len,
+                          int r, int w, int x, int must_succeed);
 extern void forward_pending_sigio(int target);
 extern int start_fork_tramp(void *arg, unsigned long temp_stack,
                             int clone_flags, int (*tramp)(void *));
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 614b8ebeb0ed..7eb52c5a7cab 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -10,7 +10,7 @@ obj-y = config.o exec_kern.o exitcode.o \
         helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
         physmem.o process_kern.o ptrace.o reboot.o resource.o sigio_user.o \
         sigio_kern.o signal_kern.o signal_user.o smp.o syscall_kern.o sysrq.o \
-        tempfile.o time.o time_kern.o tlb.o trap_kern.o trap_user.o \
+        time.o time_kern.o tlb.o trap_kern.o trap_user.o \
         uaccess_user.o um_arch.o umid.o user_util.o
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
@@ -24,8 +24,8 @@ obj-$(CONFIG_MODE_SKAS) += skas/
 
 user-objs-$(CONFIG_TTY_LOG) += tty_log.o
 
-USER_OBJS := $(user-objs-y) config.o helper.o main.o tempfile.o time.o \
-        tty_log.o umid.o user_util.o
+USER_OBJS := $(user-objs-y) config.o helper.o main.o time.o tty_log.o umid.o \
+        user_util.o
 
 include arch/um/scripts/Makefile.rules
 
diff --git a/arch/um/kernel/init_task.c b/arch/um/kernel/init_task.c
index cd7c85be0a1b..49ed5ddf0704 100644
--- a/arch/um/kernel/init_task.c
+++ b/arch/um/kernel/init_task.c
@@ -13,6 +13,7 @@
 #include "asm/pgtable.h"
 #include "user_util.h"
 #include "mem_user.h"
+#include "os.h"
 
 static struct fs_struct init_fs = INIT_FS;
 struct mm_struct init_mm = INIT_MM(init_mm);
@@ -45,8 +46,8 @@ __attribute__((__section__(".data.init_task"))) =
 
 void unprotect_stack(unsigned long stack)
 {
-        protect_memory(stack, (1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE, 
-                       1, 1, 0, 1);
+        os_protect_memory((void *) stack, (1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE,
+                       1, 1, 0);
 }
 
 /*
diff --git a/arch/um/kernel/mem_user.c b/arch/um/kernel/mem_user.c
index 4a663fd434bb..d49640d9923f 100644
--- a/arch/um/kernel/mem_user.c
+++ b/arch/um/kernel/mem_user.c
@@ -48,219 +48,16 @@
 #include "tempfile.h"
 #include "kern_constants.h"
 
-#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
-
-static int create_tmp_file(unsigned long len)
-{
-        int fd, err;
-        char zero;
-
-        fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
-        if(fd < 0) {
-                os_print_error(fd, "make_tempfile");
-                exit(1);
-        }
-
-        err = os_mode_fd(fd, 0777);
-        if(err < 0){
-                os_print_error(err, "os_mode_fd");
-                exit(1);
-        }
-        err = os_seek_file(fd, len);
-        if(err < 0){
-                os_print_error(err, "os_seek_file");
-                exit(1);
-        }
-        zero = 0;
-        err = os_write_file(fd, &zero, 1);
-        if(err != 1){
-                os_print_error(err, "os_write_file");
-                exit(1);
-        }
-
-        return(fd);
-}
-
-void check_tmpexec(void)
-{
-        void *addr;
-        int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
-
-        addr = mmap(NULL, UM_KERN_PAGE_SIZE,
-                    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
-        printf("Checking PROT_EXEC mmap in /tmp...");
-        fflush(stdout);
-        if(addr == MAP_FAILED){
-                err = errno;
-                perror("failed");
-                if(err == EPERM)
-                        printf("/tmp must be not mounted noexec\n");
-                exit(1);
-        }
-        printf("OK\n");
-        munmap(addr, UM_KERN_PAGE_SIZE);
-
-        os_close_file(fd);
-}
-
-static int have_devanon = 0;
-
-void check_devanon(void)
-{
-        int fd;
-
-        printk("Checking for /dev/anon on the host...");
-        fd = open("/dev/anon", O_RDWR);
-        if(fd < 0){
-                printk("Not available (open failed with errno %d)\n", errno);
-                return;
-        }
-
-        printk("OK\n");
-        have_devanon = 1;
-}
-
-static int create_anon_file(unsigned long len)
-{
-        void *addr;
-        int fd;
-
-        fd = open("/dev/anon", O_RDWR);
-        if(fd < 0) {
-                os_print_error(fd, "opening /dev/anon");
-                exit(1);
-        }
-
-        addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-        if(addr == MAP_FAILED){
-                perror("mapping physmem file");
-                exit(1);
-        }
-        munmap(addr, len);
-
-        return(fd);
-}
-
-int create_mem_file(unsigned long len)
-{
-        int err, fd;
-
-        if(have_devanon)
-                fd = create_anon_file(len);
-        else fd = create_tmp_file(len);
-
-        err = os_set_exec_close(fd, 1);
-        if(err < 0)
-                os_print_error(err, "exec_close");
-        return(fd);
-}
-
 struct iomem_region *iomem_regions = NULL;
 int iomem_size = 0;
 
-static int __init parse_iomem(char *str, int *add)
-{
-        struct iomem_region *new;
-        struct uml_stat buf;
-        char *file, *driver;
-        int fd, err, size;
-
-        driver = str;
-        file = strchr(str,',');
-        if(file == NULL){
-                printf("parse_iomem : failed to parse iomem\n");
-                goto out;
-        }
-        *file = '\0';
-        file++;
-        fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
-        if(fd < 0){
-                os_print_error(fd, "parse_iomem - Couldn't open io file");
-                goto out;
-        }
-
-        err = os_stat_fd(fd, &buf);
-        if(err < 0){
-                os_print_error(err, "parse_iomem - cannot stat_fd file");
-                goto out_close;
-        }
-
-        new = malloc(sizeof(*new));
-        if(new == NULL){
-                perror("Couldn't allocate iomem_region struct");
-                goto out_close;
-        }
-
-        size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
-
-        *new = ((struct iomem_region) { .next           = iomem_regions,
-                                        .driver         = driver,
-                                        .fd             = fd,
-                                        .size           = size,
-                                        .phys           = 0,
-                                        .virt           = 0 });
-        iomem_regions = new;
-        iomem_size += new->size + UM_KERN_PAGE_SIZE;
-
-        return(0);
- out_close:
-        os_close_file(fd);
- out:
-        return(1);
-}
+extern int parse_iomem(char *str, int *add) __init;
 
 __uml_setup("iomem=", parse_iomem,
 "iomem=<name>,<file>\n"
 "    Configure <file> as an IO memory region named <name>.\n\n"
 );
 
-int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
-                   int must_succeed)
-{
-        int err;
-
-        err = os_protect_memory((void *) addr, len, r, w, x);
-        if(err < 0){
-                if(must_succeed)
-                        panic("protect failed, err = %d", -err);
-                else return(err);
-        }
-        return(0);
-}
-
-#if 0
-/* Debugging facility for dumping stuff out to the host, avoiding the timing
- * problems that come with printf and breakpoints.
- * Enable in case of emergency.
- */
-
-int logging = 1;
-int logging_fd = -1;
-
-int logging_line = 0;
-char logging_buf[512];
-
-void log(char *fmt, ...)
-{
-        va_list ap;
-        struct timeval tv;
-        struct openflags flags;
-
-        if(logging == 0) return;
-        if(logging_fd < 0){
-                flags = of_create(of_trunc(of_rdwr(OPENFLAGS())));
-                logging_fd = os_open_file("log", flags, 0644);
-        }
-        gettimeofday(&tv, NULL);
-        sprintf(logging_buf, "%d\t %u.%u  ", logging_line++, tv.tv_sec,
-                tv.tv_usec);
-        va_start(ap, fmt);
-        vsprintf(&logging_buf[strlen(logging_buf)], fmt, ap);
-        va_end(ap);
-        write(logging_fd, logging_buf, strlen(logging_buf));
-}
-#endif
-
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically
diff --git a/arch/um/kernel/tempfile.c b/arch/um/kernel/tempfile.c
deleted file mode 100644
index b1674bc1395d..000000000000
--- a/arch/um/kernel/tempfile.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <sys/param.h>
-#include "init.h"
-
-/* Modified from create_mem_file and start_debugger */
-static char *tempdir = NULL;
-
-static void __init find_tempdir(void)
-{
-        char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
-        int i;
-        char *dir = NULL;
-
-        if(tempdir != NULL) return;     /* We've already been called */
-        for(i = 0; dirs[i]; i++){
-                dir = getenv(dirs[i]);
-                if((dir != NULL) && (*dir != '\0'))
-                        break;
-        }
-        if((dir == NULL) || (*dir == '\0')) 
-                dir = "/tmp";
-
-        tempdir = malloc(strlen(dir) + 2);
-        if(tempdir == NULL){
-                fprintf(stderr, "Failed to malloc tempdir, "
-                        "errno = %d\n", errno);
-                return;
-        }
-        strcpy(tempdir, dir);
-        strcat(tempdir, "/");
-}
-
-int make_tempfile(const char *template, char **out_tempname, int do_unlink)
-{
-        char tempname[MAXPATHLEN];
-        int fd;
-
-        find_tempdir();
-        if (*template != '/')
-                strcpy(tempname, tempdir);
-        else
-                *tempname = 0;
-        strcat(tempname, template);
-        fd = mkstemp(tempname);
-        if(fd < 0){
-                fprintf(stderr, "open - cannot create %s: %s\n", tempname, 
-                        strerror(errno));
-                return -1;
-        }
-        if(do_unlink && (unlink(tempname) < 0)){
-                perror("unlink");
-                return -1;
-        }
-        if(out_tempname){
-                *out_tempname = strdup(tempname);
-                if(*out_tempname == NULL){
-                        perror("strdup");
-                        return -1;
-                }
-        }
-        return(fd);
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 80ed6188e8a2..0a562c3c0fd8 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -307,7 +307,7 @@ int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
                 }
                 else if(pte_newprot(*pte)){
                         updated = 1;
-                        protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
+                        os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
                 }
                 addr += PAGE_SIZE;
         }
diff --git a/arch/um/kernel/tt/mem_user.c b/arch/um/kernel/tt/mem_user.c
index 3085267459b1..03e589895388 100644
--- a/arch/um/kernel/tt/mem_user.c
+++ b/arch/um/kernel/tt/mem_user.c
@@ -12,6 +12,7 @@
 #include "tt.h"
 #include "mem_user.h"
 #include "user_util.h"
+#include "os.h"
 
 void remap_data(void *segment_start, void *segment_end, int w)
 {
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 09f6f7ce4695..f0a275947d34 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -361,11 +361,6 @@ int linux_main(int argc, char **argv)
         uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
                                      &host_task_size, &task_size);
 
-        /* Need to check this early because mmapping happens before the
-         * kernel is running.
-         */
-        check_tmpexec();
-
         brk_start = (unsigned long) sbrk(0);
         CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
         /* Increase physical memory size for exec-shield users
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
index 7a1662419c0c..d15ec2af6a22 100644
--- a/arch/um/os-Linux/Makefile
+++ b/arch/um/os-Linux/Makefile
@@ -3,11 +3,11 @@
 # Licensed under the GPL
 #
 
-obj-y = aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
-        tty.o user_syms.o drivers/ sys-$(SUBARCH)/
+obj-y = aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o time.o \
+        tt.o tty.o user_syms.o drivers/ sys-$(SUBARCH)/
 
-USER_OBJS := aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
-        tty.o
+USER_OBJS := aio.o elf_aux.o file.o mem.o process.o signal.o start_up.o \
+        time.o tt.o tty.o
 
 elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
 CFLAGS_elf_aux.o += -I$(objtree)/arch/um
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
new file mode 100644
index 000000000000..8e71edaaf80b
--- /dev/null
+++ b/arch/um/os-Linux/mem.c
@@ -0,0 +1,161 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include "kern_util.h"
+#include "user.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "init.h"
+#include "os.h"
+#include "tempfile.h"
+#include "kern_constants.h"
+
+#include <sys/param.h>
+
+static char *tempdir = NULL;
+
+static void __init find_tempdir(void)
+{
+        char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
+        int i;
+        char *dir = NULL;
+
+        if(tempdir != NULL) return;     /* We've already been called */
+        for(i = 0; dirs[i]; i++){
+                dir = getenv(dirs[i]);
+                if((dir != NULL) && (*dir != '\0'))
+                        break;
+        }
+        if((dir == NULL) || (*dir == '\0'))
+                dir = "/tmp";
+
+        tempdir = malloc(strlen(dir) + 2);
+        if(tempdir == NULL){
+                fprintf(stderr, "Failed to malloc tempdir, "
+                        "errno = %d\n", errno);
+                return;
+        }
+        strcpy(tempdir, dir);
+        strcat(tempdir, "/");
+}
+
+/*
+ * This proc still used in tt-mode
+ * (file: kernel/tt/ptproxy/proxy.c, proc: start_debugger).
+ * So it isn't 'static' yet.
+ */
+int make_tempfile(const char *template, char **out_tempname, int do_unlink)
+{
+        char tempname[MAXPATHLEN];
+        int fd;
+
+        find_tempdir();
+        if (*template != '/')
+                strcpy(tempname, tempdir);
+        else
+                *tempname = 0;
+        strcat(tempname, template);
+        fd = mkstemp(tempname);
+        if(fd < 0){
+                fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+                        strerror(errno));
+                return -1;
+        }
+        if(do_unlink && (unlink(tempname) < 0)){
+                perror("unlink");
+                return -1;
+        }
+        if(out_tempname){
+                *out_tempname = strdup(tempname);
+                if(*out_tempname == NULL){
+                        perror("strdup");
+                        return -1;
+                }
+        }
+        return(fd);
+}
+
+#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
+
+/*
+ * This proc is used in start_up.c
+ * So it isn't 'static'.
+ */
+int create_tmp_file(unsigned long len)
+{
+        int fd, err;
+        char zero;
+
+        fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
+        if(fd < 0) {
+                exit(1);
+        }
+
+        err = fchmod(fd, 0777);
+        if(err < 0){
+                perror("os_mode_fd");
+                exit(1);
+        }
+
+        if (lseek64(fd, len, SEEK_SET) < 0) {
+                perror("os_seek_file");
+                exit(1);
+        }
+
+        zero = 0;
+
+        err = os_write_file(fd, &zero, 1);
+        if(err != 1){
+                errno = -err;
+                perror("os_write_file");
+                exit(1);
+        }
+
+        return(fd);
+}
+
+static int create_anon_file(unsigned long len)
+{
+        void *addr;
+        int fd;
+
+        fd = open("/dev/anon", O_RDWR);
+        if(fd < 0) {
+                perror("opening /dev/anon");
+                exit(1);
+        }
+
+        addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+        if(addr == MAP_FAILED){
+                perror("mapping physmem file");
+                exit(1);
+        }
+        munmap(addr, len);
+
+        return(fd);
+}
+
+extern int have_devanon;
+
+int create_mem_file(unsigned long len)
+{
+        int err, fd;
+
+        if(have_devanon)
+                fd = create_anon_file(len);
+        else fd = create_tmp_file(len);
+
+        err = os_set_exec_close(fd, 1);
+        if(err < 0){
+                errno = -err;
+                perror("exec_close");
+        }
+        return(fd);
+}
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 040cc1472bc7..6af83171ca4e 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -4,18 +4,22 @@
  */
 
 #include <stdio.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <signal.h>
 #include <sched.h>
+#include <fcntl.h>
 #include <errno.h>
-#include <stdarg.h>
-#include <stdlib.h>
 #include <setjmp.h>
 #include <sys/time.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
 #include <asm/unistd.h>
 #include <asm/page.h>
+#include <sys/types.h>
 #include "user_util.h"
 #include "kern_util.h"
 #include "user.h"
@@ -25,6 +29,7 @@
 #include "sysdep/sigcontext.h"
 #include "irq_user.h"
 #include "ptrace_user.h"
+#include "mem_user.h"
 #include "time_user.h"
 #include "init.h"
 #include "os.h"
@@ -32,6 +37,8 @@
 #include "choose-mode.h"
 #include "mode.h"
 #include "tempfile.h"
+#include "kern_constants.h"
+
 #ifdef UML_CONFIG_MODE_SKAS
 #include "skas.h"
 #include "skas_ptrace.h"
@@ -276,9 +283,38 @@ static void __init check_ptrace(void)
         check_sysemu();
 }
 
+extern int create_tmp_file(unsigned long len);
+
+static void check_tmpexec(void)
+{
+        void *addr;
+        int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
+
+        addr = mmap(NULL, UM_KERN_PAGE_SIZE,
+                    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+        printf("Checking PROT_EXEC mmap in /tmp...");
+        fflush(stdout);
+        if(addr == MAP_FAILED){
+                err = errno;
+                perror("failed");
+                if(err == EPERM)
+                        printf("/tmp must be not mounted noexec\n");
+                exit(1);
+        }
+        printf("OK\n");
+        munmap(addr, UM_KERN_PAGE_SIZE);
+
+        close(fd);
+}
+
 void os_early_checks(void)
 {
         check_ptrace();
+
+        /* Need to check this early because mmapping happens before the
+         * kernel is running.
+         */
+        check_tmpexec();
 }
 
 static int __init noprocmm_cmd_param(char *str, int* add)
@@ -357,3 +393,72 @@ int can_do_skas(void)
         return(0);
 }
 #endif
+
+int have_devanon = 0;
+
+void check_devanon(void)
+{
+        int fd;
+
+        printk("Checking for /dev/anon on the host...");
+        fd = open("/dev/anon", O_RDWR);
+        if(fd < 0){
+                printk("Not available (open failed with errno %d)\n", errno);
+                return;
+        }
+
+        printk("OK\n");
+        have_devanon = 1;
+}
+
+int __init parse_iomem(char *str, int *add)
+{
+        struct iomem_region *new;
+        struct uml_stat buf;
+        char *file, *driver;
+        int fd, err, size;
+
+        driver = str;
+        file = strchr(str,',');
+        if(file == NULL){
+                printf("parse_iomem : failed to parse iomem\n");
+                goto out;
+        }
+        *file = '\0';
+        file++;
+        fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
+        if(fd < 0){
+                os_print_error(fd, "parse_iomem - Couldn't open io file");
+                goto out;
+        }
+
+        err = os_stat_fd(fd, &buf);
+        if(err < 0){
+                os_print_error(err, "parse_iomem - cannot stat_fd file");
+                goto out_close;
+        }
+
+        new = malloc(sizeof(*new));
+        if(new == NULL){
+                perror("Couldn't allocate iomem_region struct");
+                goto out_close;
+        }
+
+        size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
+
+        *new = ((struct iomem_region) { .next           = iomem_regions,
+                                        .driver         = driver,
+                                        .fd             = fd,
+                                        .size           = size,
+                                        .phys           = 0,
+                                        .virt           = 0 });
+        iomem_regions = new;
+        iomem_size += new->size + UM_KERN_PAGE_SIZE;
+
+        return(0);
+ out_close:
+        os_close_file(fd);
+ out:
+        return(1);
+}
+
diff --git a/arch/um/os-Linux/tt.c b/arch/um/os-Linux/tt.c
index 5b047ab8416a..a6db8877931a 100644
--- a/arch/um/os-Linux/tt.c
+++ b/arch/um/os-Linux/tt.c
@@ -36,6 +36,20 @@
 #include "mode.h"
 #include "tempfile.h"
 
+int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
+                   int must_succeed)
+{
+        int err;
+
+        err = os_protect_memory((void *) addr, len, r, w, x);
+        if(err < 0){
+                if(must_succeed)
+                        panic("protect failed, err = %d", -err);
+                else return(err);
+        }
+        return(0);
+}
+
 /*
  *-------------------------
  * only for tt mode (will be deleted in future...)