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Diffstat (limited to 'rubbos/app/httpd-2.0.64/srclib/apr/misc/os2/randbyte.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/srclib/apr/misc/os2/randbyte.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/srclib/apr/misc/os2/randbyte.c b/rubbos/app/httpd-2.0.64/srclib/apr/misc/os2/randbyte.c new file mode 100644 index 00000000..4020e31f --- /dev/null +++ b/rubbos/app/httpd-2.0.64/srclib/apr/misc/os2/randbyte.c @@ -0,0 +1,123 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* The high resolution timer API provides access to the hardware timer + * running at around 1.1MHz. The amount this changes in a time slice is + * varies randomly due to system events, hardware interrupts etc + */ +static UCHAR randbyte_hrtimer() +{ + QWORD t1, t2; + UCHAR byte; + + DosTmrQueryTime(&t1); + DosSleep(5); + DosTmrQueryTime(&t2); + + byte = (t2.ulLo - t1.ulLo) & 0xFF; + byte ^= (t2.ulLo - t1.ulLo) >> 8; + return byte; +} + + + +/* A bunch of system information like memory & process stats. + * Not highly random but every bit helps.... + */ +static UCHAR randbyte_sysinfo() +{ + UCHAR byte = 0; + UCHAR SysVars[100]; + int b; + + DosQuerySysInfo(1, QSV_FOREGROUND_PROCESS, SysVars, sizeof(SysVars)); + + for (b = 0; b < 100; b++) { + byte ^= SysVars[b]; + } + + return byte; +} + + + +/* Similar in concept to randbyte_hrtimer() but accesses the CPU's internal + * counters which run at the CPU's MHz speed. We get separate + * idle / busy / interrupt cycle counts which should provide very good + * randomness due to interference of hardware events. + * This only works on newer CPUs (at least PPro or K6) and newer OS/2 versions + * which is why it's run-time linked. + */ + +static APIRET APIENTRY(*DosPerfSysCall) (ULONG ulCommand, ULONG ulParm1, + ULONG ulParm2, ULONG ulParm3) = NULL; +static HMODULE hDoscalls = 0; +#define CMD_KI_RDCNT (0x63) + +typedef struct _CPUUTIL { + ULONG ulTimeLow; /* Low 32 bits of time stamp */ + ULONG ulTimeHigh; /* High 32 bits of time stamp */ + ULONG ulIdleLow; /* Low 32 bits of idle time */ + ULONG ulIdleHigh; /* High 32 bits of idle time */ + ULONG ulBusyLow; /* Low 32 bits of busy time */ + ULONG ulBusyHigh; /* High 32 bits of busy time */ + ULONG ulIntrLow; /* Low 32 bits of interrupt time */ + ULONG ulIntrHigh; /* High 32 bits of interrupt time */ +} CPUUTIL; + + +static UCHAR randbyte_perf() +{ + UCHAR byte = 0; + CPUUTIL util; + int c; + + if (hDoscalls == 0) { + char failed_module[20]; + ULONG rc; + + rc = DosLoadModule(failed_module, sizeof(failed_module), "DOSCALLS", + &hDoscalls); + + if (rc == 0) { + rc = DosQueryProcAddr(hDoscalls, 976, NULL, (PFN *)&DosPerfSysCall); + + if (rc) { + DosPerfSysCall = NULL; + } + } + } + + if (DosPerfSysCall) { + if (DosPerfSysCall(CMD_KI_RDCNT, (ULONG)&util, 0, 0) == 0) { + for (c = 0; c < sizeof(util); c++) { + byte ^= ((UCHAR *)&util)[c]; + } + } + else { + DosPerfSysCall = NULL; + } + } + + return byte; +} + + + +static UCHAR randbyte() +{ + return randbyte_hrtimer() ^ randbyte_sysinfo() ^ randbyte_perf(); +} |