27 lines
1.4 KiB
NASM
27 lines
1.4 KiB
NASM
; The services the system offers, named and numbered.
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;
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; Both sides include this. The system follows it with handlers for the ones it implements.
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; A program that only calls them includes this and nothing else, and can then say them by
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; name, because a line with a name and nothing after it declares what a vector is called
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; and what number it has without claiming to implement it.
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;
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; THE NUMBERS ARE WRITTEN DOWN HERE, and that is the only place they are written. They
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; used to be decided by the order of the lines, which worked and was quietly fragile: a
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; service inserted in the middle renumbered everything after it, and a program already
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; assembled against the old numbers would go on calling the number rather than the name.
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; Worse, the numbers a program got for its OWN traps moved depending on whether it had
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; included this file, and a program that had not was given 16 - which is osPrintString.
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;
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; So these are pinned. They come from the range set aside for numbers that two separately
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; assembled programs have to agree about; everything a program names for itself is drawn
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; from higher up and cannot collide with these however it is built. Adding a service takes
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; the next free number here and disturbs nothing.
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;
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; Written by Anachronaut
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#Vectors
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osPrintString 0d16 ; DP0 names a string. Prints it.
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osReadLine 0d17 ; DP0 names somewhere to put a line read from the console.
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osExit 0d18 ; Give the machine back to the system.
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