35728b8209
Update the time(r) core files files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Philippe Ombredanne, Kate Stewart and myself. The data has been created with two independent license scanners and manual inspection. The following files do not contain any direct license information and have been omitted from the big initial SPDX changes: timeconst.bc: The .bc files were not touched time.c, timer.c, timekeeping.c: Licence was deduced from EXPORT_SYMBOL_GPL As those files do not contain direct license references they fall under the project license, i.e. GPL V2 only. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: John Stultz <john.stultz@linaro.org> Acked-by: Corey Minyard <cminyard@mvista.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: David Riley <davidriley@chromium.org> Cc: Colin Cross <ccross@android.com> Cc: Mark Brown <broonie@kernel.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: https://lkml.kernel.org/r/20181031182252.879109557@linutronix.de
118 lines
3.0 KiB
Plaintext
118 lines
3.0 KiB
Plaintext
/* SPDX-License-Identifier: GPL-2.0 */
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scale=0
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define gcd(a,b) {
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auto t;
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while (b) {
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t = b;
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b = a % b;
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a = t;
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}
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return a;
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}
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/* Division by reciprocal multiplication. */
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define fmul(b,n,d) {
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return (2^b*n+d-1)/d;
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}
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/* Adjustment factor when a ceiling value is used. Use as:
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(imul * n) + (fmulxx * n + fadjxx) >> xx) */
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define fadj(b,n,d) {
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auto v;
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d = d/gcd(n,d);
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v = 2^b*(d-1)/d;
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return v;
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}
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/* Compute the appropriate mul/adj values as well as a shift count,
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which brings the mul value into the range 2^b-1 <= x < 2^b. Such
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a shift value will be correct in the signed integer range and off
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by at most one in the upper half of the unsigned range. */
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define fmuls(b,n,d) {
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auto s, m;
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for (s = 0; 1; s++) {
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m = fmul(s,n,d);
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if (m >= 2^(b-1))
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return s;
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}
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return 0;
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}
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define timeconst(hz) {
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print "/* Automatically generated by kernel/time/timeconst.bc */\n"
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print "/* Time conversion constants for HZ == ", hz, " */\n"
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print "\n"
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print "#ifndef KERNEL_TIMECONST_H\n"
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print "#define KERNEL_TIMECONST_H\n\n"
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print "#include <linux/param.h>\n"
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print "#include <linux/types.h>\n\n"
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print "#if HZ != ", hz, "\n"
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print "#error \qinclude/generated/timeconst.h has the wrong HZ value!\q\n"
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print "#endif\n\n"
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if (hz < 2) {
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print "#error Totally bogus HZ value!\n"
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} else {
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s=fmuls(32,1000,hz)
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obase=16
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print "#define HZ_TO_MSEC_MUL32\tU64_C(0x", fmul(s,1000,hz), ")\n"
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print "#define HZ_TO_MSEC_ADJ32\tU64_C(0x", fadj(s,1000,hz), ")\n"
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obase=10
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print "#define HZ_TO_MSEC_SHR32\t", s, "\n"
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s=fmuls(32,hz,1000)
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obase=16
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print "#define MSEC_TO_HZ_MUL32\tU64_C(0x", fmul(s,hz,1000), ")\n"
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print "#define MSEC_TO_HZ_ADJ32\tU64_C(0x", fadj(s,hz,1000), ")\n"
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obase=10
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print "#define MSEC_TO_HZ_SHR32\t", s, "\n"
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obase=10
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cd=gcd(hz,1000)
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print "#define HZ_TO_MSEC_NUM\t\t", 1000/cd, "\n"
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print "#define HZ_TO_MSEC_DEN\t\t", hz/cd, "\n"
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print "#define MSEC_TO_HZ_NUM\t\t", hz/cd, "\n"
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print "#define MSEC_TO_HZ_DEN\t\t", 1000/cd, "\n"
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print "\n"
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s=fmuls(32,1000000,hz)
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obase=16
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print "#define HZ_TO_USEC_MUL32\tU64_C(0x", fmul(s,1000000,hz), ")\n"
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print "#define HZ_TO_USEC_ADJ32\tU64_C(0x", fadj(s,1000000,hz), ")\n"
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obase=10
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print "#define HZ_TO_USEC_SHR32\t", s, "\n"
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s=fmuls(32,hz,1000000)
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obase=16
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print "#define USEC_TO_HZ_MUL32\tU64_C(0x", fmul(s,hz,1000000), ")\n"
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print "#define USEC_TO_HZ_ADJ32\tU64_C(0x", fadj(s,hz,1000000), ")\n"
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obase=10
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print "#define USEC_TO_HZ_SHR32\t", s, "\n"
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obase=10
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cd=gcd(hz,1000000)
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print "#define HZ_TO_USEC_NUM\t\t", 1000000/cd, "\n"
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print "#define HZ_TO_USEC_DEN\t\t", hz/cd, "\n"
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print "#define USEC_TO_HZ_NUM\t\t", hz/cd, "\n"
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print "#define USEC_TO_HZ_DEN\t\t", 1000000/cd, "\n"
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cd=gcd(hz,1000000000)
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print "#define HZ_TO_NSEC_NUM\t\t", 1000000000/cd, "\n"
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print "#define HZ_TO_NSEC_DEN\t\t", hz/cd, "\n"
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print "#define NSEC_TO_HZ_NUM\t\t", hz/cd, "\n"
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print "#define NSEC_TO_HZ_DEN\t\t", 1000000000/cd, "\n"
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print "\n"
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print "#endif /* KERNEL_TIMECONST_H */\n"
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}
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halt
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}
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hz = read();
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timeconst(hz)
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