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https://github.com/hsoft/collapseos.git
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91f79d1131
The idea is to consider assemblers as "runtime" apps instead of placing them in the "bootstrap" section of the blocks. These apps will be used for much more than bootstrapping. Moved its documentation to doc/asm.txt and made its code blocks more compact.
76 lines
1.7 KiB
Forth
76 lines
1.7 KiB
Forth
0xbf00 CONSTANT RS_ADDR
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0xbffa CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT SYSVARS
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0x8000 CONSTANT HERESTART
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SYSVARS 0x70 + CONSTANT LCD_MEM
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SYSVARS 0x72 + CONSTANT KBD_MEM
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0x01 CONSTANT KBD_PORT
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5 LOAD ( z80 assembler )
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
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262 LOAD ( xcomp )
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522 LOAD ( font compiler )
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282 LOAD ( boot.z80.decl )
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270 LOAD ( xcomp overrides )
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( TI-84+ requires specific code at specific offsets which
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come in conflict with Collapse OS' stable ABI. We thus
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offset the binary by 0x100, which is our minimum possible
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increment and fill the TI stuff with the code below. )
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0x5a JP, 0x15 ZFILL, ( 0x18 )
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0x5a JP, ( reboot ) 0x1d ZFILL, ( 0x38 )
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( handleInterrupt )
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DI,
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AF PUSH,
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( did we push the ON button? )
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0x04 ( PORT_INT_TRIG ) INAi,
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0 ( INT_TRIG_ON ) A BIT,
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IFNZ,
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( yes? acknowledge and boot )
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0x03 ( PORT_INT_MASK ) INAi,
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0x00 ( INT_MASK_ON ) A RES, ( ack interrupt )
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0x03 ( PORT_INT_MASK ) OUTiA,
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AF POPqq,
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EI,
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0x100 JP,
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THEN,
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AF POP,
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EI,
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RETI,
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0x03 ZFILL, ( 0x53 )
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0x5a JP, ( 0x56 ) 0xff A, 0xa5 A, 0xff A, ( 0x5a )
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( boot )
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DI,
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IM1,
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( enable the ON key interrupt )
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0x03 ( PORT_INT_MASK ) INAi,
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0x00 ( INT_MASK_ON ) A SET,
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0x03 ( PORT_INT_MASK ) OUTiA,
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A 0x80 LDri,
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0x07 ( PORT_BANKB ) OUTiA,
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EI,
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( LCD off )
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A 0x02 ( LCD_CMD_DISABLE ) LDri,
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0x10 ( LCD_PORT_CMD ) OUTiA,
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HALT,
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0x95 ZFILL, ( 0x100 )
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( All set, carry on! )
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CURRENT @ XCURRENT !
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0x100 BIN( !
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283 335 LOADR ( boot.z80 )
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353 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT3x5
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605 610 LOADR ( LCD low )
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616 620 LOADR ( KBD low )
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380 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," LCD$ KBD$ " EOT,
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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