Benji Dial
e8c6577617
big kernel additions: paging, elf loading, separate kernel and user page allocation it now properly loads and runs sd0:bin/init.elf still need to determine which disk was booted from, and start the init on that disk
42 lines
No EOL
1.3 KiB
Text
42 lines
No EOL
1.3 KiB
Text
keycodes are 32-bit integers.
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the low byte indicates the key itself. for printable characters (and keys with
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reasonable translations to ascii control codes), this is the ascii code. for
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other ones, something in the range of 0x80 to 0xff is used, seen in table 1.
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the top 24 bits indicate several flags. these are seen in table 2, where bit 0
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is the lowest bit of the second lowest byte of the keycode, and bit 23 is the
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highest bit of the highest byte of the keycode.
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the "get key" system call returns 0 if there is not a key available. it is
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recommended to make the system call and, if it returns 0, yield to the scheduler
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and then loop back to making the system call. this way your task does not block
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the cpu while waiting for keyboard input. see the "get_key_char" function in
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user.c of the "knob" library for an example of this.
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table 1:
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code | key
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------|-----
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0x80 |
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.... |
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0xff |
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table 2:
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bit 0: left shift
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bit 1: right shift
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bit 2: caps lock
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bit 3: insert
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bit 4: num lock
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bit 5: scroll lock
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bit 6: left alt
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bit 7: right alt
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bit 8: left control
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bit 9: right control
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bit 10: left meta
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bit 11: right meta
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bits 12-23 are reserved for future versions. in this version, they should be set
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to zero when giving a keycode, and should be ignored when recieving a keycode. |