RDTSC delay and inclusion of asm/msr.h removed

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@844 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

5 files changed, 14 insertions, 258 deletions

diff --git a/config.h.in b/config.h.in
index 30902ba..650b03e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -12,9 +12,6 @@
 /* Define to 1 if you have the <asm/io.h> header file. */
 #undef HAVE_ASM_IO_H
 
-/* Define to 1 if you have the <asm/msr.h> header file. */
-#undef HAVE_ASM_MSR_H
-
 /* Define to 1 if you have the <dirent.h> header file, and it defines `DIR'.
    */
 #undef HAVE_DIRENT_H
diff --git a/configure b/configure
index d6e9ece..5f991e1 100755
--- a/configure
+++ b/configure
@@ -7990,6 +7990,7 @@ if test "$X11" = "yes"; then
 echo "$as_me: WARNING: X11 headers or libraries not available: X11 driver disabled" >&2;}
    else
       GRAPHIC="yes"
+      KEYPAD="yes"
       DRIVERS="$DRIVERS drv_X11.o"
       if test "x$ac_x_libraries" = "x"; then
 	DRVLIBS="$DRVLIBS -lX11"
@@ -11407,151 +11408,6 @@ fi
 done
 
 
-for ac_header in asm/msr.h
-do
-as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
-if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
-  { echo "$as_me:$LINENO: checking for $ac_header" >&5
-echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
-if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-fi
-ac_res=`eval echo '${'$as_ac_Header'}'`
-	       { echo "$as_me:$LINENO: result: $ac_res" >&5
-echo "${ECHO_T}$ac_res" >&6; }
-else
-  # Is the header compilable?
-{ echo "$as_me:$LINENO: checking $ac_header usability" >&5
-echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6; }
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-$ac_includes_default
-#include <$ac_header>
-_ACEOF
-rm -f conftest.$ac_objext
-if { (ac_try="$ac_compile"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_compile") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest.$ac_objext; then
-  ac_header_compiler=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	ac_header_compiler=no
-fi
-
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-{ echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
-echo "${ECHO_T}$ac_header_compiler" >&6; }
-
-# Is the header present?
-{ echo "$as_me:$LINENO: checking $ac_header presence" >&5
-echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6; }
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-#include <$ac_header>
-_ACEOF
-if { (ac_try="$ac_cpp conftest.$ac_ext"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
-  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       }; then
-  ac_header_preproc=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-  ac_header_preproc=no
-fi
-
-rm -f conftest.err conftest.$ac_ext
-{ echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
-echo "${ECHO_T}$ac_header_preproc" >&6; }
-
-# So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
-  yes:no: )
-    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
-echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
-echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
-    ac_header_preproc=yes
-    ;;
-  no:yes:* )
-    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
-echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
-echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
-echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
-echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
-echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
-    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
-echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
-    ( cat <<\_ASBOX
-## ---------------------------------------------------- ##
-## Report this to lcd4linux-users@lists.sourceforge.net ##
-## ---------------------------------------------------- ##
-_ASBOX
-     ) | sed "s/^/$as_me: WARNING:     /" >&2
-    ;;
-esac
-{ echo "$as_me:$LINENO: checking for $ac_header" >&5
-echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
-if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  eval "$as_ac_Header=\$ac_header_preproc"
-fi
-ac_res=`eval echo '${'$as_ac_Header'}'`
-	       { echo "$as_me:$LINENO: result: $ac_res" >&5
-echo "${ECHO_T}$ac_res" >&6; }
-
-fi
-if test `eval echo '${'$as_ac_Header'}'` = yes; then
-  cat >>confdefs.h <<_ACEOF
-#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-
-done
-
-
 # Checks for typedefs, structures, and compiler characteristics.
 { echo "$as_me:$LINENO: checking for an ANSI C-conforming const" >&5
 echo $ECHO_N "checking for an ANSI C-conforming const... $ECHO_C" >&6; }
diff --git a/configure.in b/configure.in
index 8cbfe03..e3e79e9 100644
--- a/configure.in
+++ b/configure.in
@@ -102,7 +102,6 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h netdb.h netinet/in.h stdlib.h string.h sys/ioctl.h sys/socket.h sys/time.h sys/vfs.h syslog.h termios.h unistd.h])
 AC_CHECK_HEADERS(asm/io.h)
 AC_CHECK_HEADERS(linux/parport.h linux/ppdev.h)
-AC_CHECK_HEADERS(asm/msr.h)
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
diff --git a/drivers.m4 b/drivers.m4
index 6e7d76b..e89978f 100644
--- a/drivers.m4
+++ b/drivers.m4
@@ -531,6 +531,7 @@ if test "$X11" = "yes"; then
       AC_MSG_WARN(X11 headers or libraries not available: X11 driver disabled)
    else
       GRAPHIC="yes"
+      KEYPAD="yes"
       DRIVERS="$DRIVERS drv_X11.o"
       if test "x$ac_x_libraries" = "x"; then
 	DRVLIBS="$DRVLIBS -lX11"
diff --git a/udelay.c b/udelay.c
index 83d6fc3..9ea4a8f 100644
--- a/udelay.c
+++ b/udelay.c
@@ -55,14 +55,6 @@
 #include <string.h>
 #include <sys/time.h>
 
-#ifdef HAVE_ASM_MSR_H
-typedef u_int32_t u32;
-typedef u_int64_t u64;
-#define __KERNEL__
-#include <asm/msr.h>
-#undef __KERNEL__
-#endif
-
 
 #include "debug.h"
 #include "cfg.h"
@@ -70,79 +62,10 @@ typedef u_int64_t u64;
 #include "udelay.h"
 
 
-static unsigned int ticks_per_usec = 0;
-
-
-static void getCPUinfo(int *hasTSC, double *MHz)
-{
-    int fd;
-    char buffer[4096], *p;
-
-    *hasTSC = 0;
-    *MHz = -1;
-
-    fd = open("/proc/cpuinfo", O_RDONLY);
-    if (fd == -1) {
-	error("udelay: open(/proc/cpuinfo) failed: %s", strerror(errno));
-	return;
-    }
-    if (read(fd, &buffer, sizeof(buffer) - 1) == -1) {
-	error("udelay: read(/proc/cpuinfo) failed: %s", strerror(errno));
-	close(fd);
-	return;
-    }
-    close(fd);
-
-    p = strstr(buffer, "flags");
-    if (p == NULL) {
-	info("udelay: /proc/cpuinfo has no 'flags' line");
-    } else {
-	p = strstr(p, "tsc");
-	if (p == NULL) {
-	    info("udelay: CPU does not support Time Stamp Counter");
-	} else {
-	    info("udelay: CPU supports Time Stamp Counter");
-	    *hasTSC = 1;
-	}
-    }
-
-    p = strstr(buffer, "cpu MHz");
-    if (p == NULL) {
-	info("udelay: /proc/cpuinfo has no 'cpu MHz' line");
-    } else {
-	if (sscanf(p + 7, " : %lf", MHz) != 1) {
-	    error("udelay: parse(/proc/cpuinfo) failed: unknown 'cpu MHz' format");
-	    *MHz = -1;
-	} else {
-	    info("udelay: CPU runs at %f MHz", *MHz);
-	}
-    }
-
-}
-
 
 void udelay_init(void)
 {
-#ifdef HAVE_ASM_MSR_H
-
-    int tsc;
-    double mhz;
-
-    getCPUinfo(&tsc, &mhz);
-
-    if (tsc && mhz > 0.0) {
-	ticks_per_usec = ceil(mhz);
-	info("udelay: using TSC delay loop, %u ticks per microsecond", ticks_per_usec);
-    } else
-#else
-    error("udelay: The file 'include/asm/msr.h' was missing at compile time.");
-    error("udelay: Even if your CPU supports TSC, it will not be used!");
-    error("udelay: You *really* should install msr.h and recompile LCD4linux!");
-#endif
-    {
-	ticks_per_usec = 0;
-	info("udelay: using gettimeofday() delay loop");
-    }
+    info("udelay: using gettimeofday() delay loop");
 }
 
 
@@ -175,37 +98,17 @@ unsigned long timing(const char *driver, const char *section, const char *name,
 void ndelay(const unsigned long nsec)
 {
 
-#ifdef HAVE_ASM_MSR_H
-
-    if (ticks_per_usec) {
-
-	unsigned int t1, t2;
-	unsigned long tsc;
+    struct timeval now, end;
 
-	tsc = (nsec * ticks_per_usec + 999) / 1000;
-
-	rdtscl(t1);
-	do {
-	    rep_nop();
-	    rdtscl(t2);
-	} while ((t2 - t1) < tsc);
-
-    } else
-#endif
-
-    {
-	struct timeval now, end;
-
-	gettimeofday(&end, NULL);
-	end.tv_usec += (nsec + 999) / 1000;
-	while (end.tv_usec > 1000000) {
-	    end.tv_usec -= 1000000;
-	    end.tv_sec++;
-	}
-
-	do {
-	    rep_nop();
-	    gettimeofday(&now, NULL);
-	} while (now.tv_sec == end.tv_sec ? now.tv_usec < end.tv_usec : now.tv_sec < end.tv_sec);
+    gettimeofday(&end, NULL);
+    end.tv_usec += (nsec + 999) / 1000;
+    while (end.tv_usec > 1000000) {
+	end.tv_usec -= 1000000;
+	end.tv_sec++;
     }
+
+    do {
+	rep_nop();
+	gettimeofday(&now, NULL);
+    } while (now.tv_sec == end.tv_sec ? now.tv_usec < end.tv_usec : now.tv_sec < end.tv_sec);
 }