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Annotation of qemu/roms/SLOF/board-js2x/slof/freq.fs, revision 1.1.1.1

1.1       root        1: \ *****************************************************************************
                      2: \ * Copyright (c) 2004, 2008 IBM Corporation
                      3: \ * All rights reserved.
                      4: \ * This program and the accompanying materials
                      5: \ * are made available under the terms of the BSD License
                      6: \ * which accompanies this distribution, and is available at
                      7: \ * http://www.opensource.org/licenses/bsd-license.php
                      8: \ *
                      9: \ * Contributors:
                     10: \ *     IBM Corporation - initial implementation
                     11: \ ****************************************************************************/
                     12: 
                     13: 
                     14: \ Use the HPET to calculate various frequencies.
                     15: 
                     16: \ Make HPET run.
                     17: 1 10 hpet!
                     18: 
                     19: \ Set PMC1 to count CPU cycles.
                     20: f00 mmcr0!
                     21: 
                     22: d# 1000000000000000 4 hpet@ / CONSTANT hpet-freq
                     23: 
                     24: : get-times  tbl@ pmc1@ f0 hpet@ ;
                     25: 
                     26: \ Calculate the CPU and TB frequencies.
                     27: : calibrate  get-times dup >r swap >r swap >r hpet-freq d# 100 / + >r
                     28:              BEGIN get-times dup r@ < WHILE 3drop REPEAT r> drop
                     29:              rot r> - ffffffff and \ TB
                     30:              rot r> - ffffffff and \ CPU
                     31:              rot r> - >r           \ HPET
                     32:              hpet-freq * r@ / swap
                     33:              hpet-freq * r> / ;
                     34: 
                     35: : round-to  tuck 2/ + over / * ;
                     36: calibrate TO tb-frequency d# 100000000 round-to TO cpu-frequency
                     37: 
                     38: \ Stop HPET.
                     39: 0 10 hpet!

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