forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
110 lines
2.7 KiB
Plaintext
110 lines
2.7 KiB
Plaintext
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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