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03f136a207
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: hofrat@osadl.org Link: http://lkml.kernel.org/r/1436894685-5868-1-git-send-email-Jason@zx2c4.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
109 lines
2.7 KiB
Text
109 lines
2.7 KiB
Text
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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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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