CosmOS pre-alpha and launchable application versions of old programs.
This commit is contained in:
Anachronaut
@@ -0,0 +1,781 @@
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; cosmos.asm
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; CosmOS, and the shell that is most of it.
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;
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; The machine boots into this. It registers what the hardware brought, mounts whatever
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; disk is attached, and then reads lines and does what they say until there is no more
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; typing to be had.
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;
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; ---- Where things live ----
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;
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; The system keeps to the bottom of both memories, and everything above is for whatever
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; it is running:
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;
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; Program Memory 0x0000 - 0x1FFF the system
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; 0x2000 - a loaded program's code
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; Data Memory 0x0000 - 0x0FFF the system
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; 0x1000 - a loaded program's data
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;
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; Nothing enforces that. Nothing can: the fence guards a range, and this is a convention
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; about which range belongs to whom rather than a rule about what may be touched. The
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; assembler prints both segment sizes, and they are what to watch.
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;
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; A program is staged at 0x8000 while it is being loaded, which is inside the region a
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; loaded program will own. That is safe because nothing is running during a load, and it
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; is where a big program can be read without the system reserving the room for good.
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;
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; ---- What it can do ----
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;
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; dir List what is on the disk.
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; load Read a program off the disk and put it where it asks to go.
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; run Start the program that was loaded.
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; help Say what these are.
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; exit Stop.
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;
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; dump is next. The dispatch below is a chain of comparisons, which is the right shape for
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; five commands and the wrong shape for twenty; when it grows, the table that
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; dispatchTest.asm demonstrates is where it should go.
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;
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; Written by Anachronaut
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#Include console.asm
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#Include text.asm
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#Include sbfs.asm
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#Include services.asm
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#Program
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boot:
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SETD.0 Banner
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CALL printString
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CALL newLine
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; Find out whether there is a filesystem to talk to. Doing this once at boot rather than
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; once per command means a disk swapped underneath us is not noticed, which is honest
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; for a machine whose disk is a file named on the command line.
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CALL sbfsMount
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SETD.0 DiskReady
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BNQ bootNoDisk
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INIA 0x01
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STA.0
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BRI prompt
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bootNoDisk:
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RSTA
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STA.0
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SETD.0 NoDisk
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CALL printString
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CALL newLine
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; ---- The loop ----
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prompt:
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SETD.0 PromptText
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CALL printString
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SETD.0 CommandLine
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INIB 0d63
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CALL readLine
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; Running out of typing is how this ends. It is not the same as an empty line, which is
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; just somebody pressing return, and the shell should sit there when that happens.
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SETD.0 ConsoleEndOfInput
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LDA.0
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BNA quitRanOut
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SETD.0 CommandLine
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CALL textSplit
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; An empty line asks for nothing.
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SETD.0 CommandLine
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LDA.0
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BRA prompt
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SETD.0 CommandLine
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SETD.1 DirName
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CALL textSame
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BRQ doDir
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SETD.0 CommandLine
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SETD.1 LoadName
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CALL textSame
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BRQ doLoad
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SETD.0 CommandLine
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SETD.1 RunName
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CALL textSame
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BRQ doRun
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SETD.0 CommandLine
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SETD.1 DumpName
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CALL textSame
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BRQ doDump
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SETD.0 CommandLine
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SETD.1 HelpName
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CALL textSame
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BRQ doHelp
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SETD.0 CommandLine
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SETD.1 ExitName
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CALL textSame
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BRQ quit
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; Nothing matched. Saying which word was not understood is worth the four instructions:
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; it tells somebody who mistyped what they actually typed.
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SETD.0 Unknown
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CALL printString
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SETD.0 CommandLine
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CALL printString
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CALL newLine
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BRI prompt
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; Running out of console leaves the cursor part way along a line, because there was no
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; return at the end to move it on. Somebody who typed "exit" has already pressed one, and
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; a second would only leave a blank line behind.
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quitRanOut:
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CALL newLine
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quit:
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SETD.0 Farewell
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CALL printString
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CALL newLine
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HALT
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; ---- dir ----
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;
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; Walks the directory and prints what is in it. A free entry in the middle of a directory
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; is stepped over by the walk, so what comes out is the files and nothing else.
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doDir:
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SETD.0 DiskReady
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LDA.0
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BRA dirNoDisk
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RSTA
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SETD.0 DirSeen
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STA.0
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CALL sbfsFirst
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BRI dirCheck
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dirStep:
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CALL sbfsNext
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dirCheck:
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BNQ dirDone
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SETD.0 DirSeen
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LDA.0
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INCA
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STA.0
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SETD.0 SbfsName
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CALL printString
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SETD.0 SbfsName
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CALL nameWidth
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MVQA
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CALL printSpaces
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; A file's length is its block count times 256 plus its tail, which is the block count
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; in the high byte and the tail in the low one. Nothing has to multiply anything.
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SETD.0 SbfsFileBlocks
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DPUP.0 0d01
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LDA.0
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SETD.1 DirSize
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STA.1
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SETD.0 SbfsFileTail
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LDA.0
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SETD.1 DirSize
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INCD.1
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STA.1
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SETD.0 DirSize
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CALL printWordDecimal
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CALL newLine
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BRI dirStep
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dirDone:
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SETD.0 DirSeen
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LDA.0
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CALL printByteDecimal
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SETD.0 FilesText
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CALL printString
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CALL newLine
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BRI prompt
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dirNoDisk:
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SETD.0 NoDisk
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CALL printString
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CALL newLine
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BRI prompt
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; DP0 names a string. Q is how many spaces pad it out to twenty four columns. A name
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; already that long gets one space, so that it cannot run into the number after it.
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nameWidth:
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INIA 0d24
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SETD.1 WidthLeft
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STA.1
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widthLoop:
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LDA.0
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BRA widthDone
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SETD.1 WidthLeft
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LDA.1
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DECA
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STA.1
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BRA widthFloor
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INCD.0
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BRI widthLoop
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widthFloor:
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INIA 0d1
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SETD.1 WidthLeft
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STA.1
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widthDone:
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SETD.1 WidthLeft
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LDA.1
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RSTB
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CCF
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ADD
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RET
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; ---- load ----
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;
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; Reads a program off the disk and puts it where its header asks to go. Nothing relocates
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; anything: the addresses in the header are the ones the program was built for, and it
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; would not work anywhere else.
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;
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; The whole file is staged at 0x8000 first and then blitted into place, because where the
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; pieces belong is not known until the header has been read, and the header is in the file.
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doLoad:
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SETD.0 DiskReady
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LDA.0
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BRA loadNoDisk
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SETD.1 TextRest
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LDD.0.1
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LDA.0
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BRA loadNothingNamed
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CALL sbfsFind
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BNQ loadMissing
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SETD.1 0x80 0x00
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CALL sbfsRead
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BNQ loadUnreadable
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; "SBEX", or this is not a program. Without this, loading a text file would put nonsense
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; into Program Memory and then jump into the middle of it.
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SETD.0 0x80 0x00
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SETD.2 ExecMagic
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INIA 0d4
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SETD.1 LoadCount
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STA.1
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loadMagicLoop:
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LDA.0
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LDB.2
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XOR
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BNQ loadNotProgram
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INCD.0
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INCD.2
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LDA.1
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DECA
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STA.1
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BNA loadMagicLoop
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SETD.0 0x80 0x00
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DPUP.0 0d04
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LDA.0
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INIB 0d1
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XOR
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BNQ loadWrongVersion
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; The code. It comes from the staging area just past the sixteen byte header, and goes
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; wherever the header says, in Program Memory, which the instruction set cannot write
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; and the controller can.
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INIA 0d1
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OUTA 0xE0 ; SourceBank: Data Memory, where the file was staged.
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INIA 0x80
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OUTA 0xE1
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INIA 0d16
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OUTA 0xE2 ; 0x8010, the first byte after the header.
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RSTA
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OUTA 0xE3 ; DestBank: Program Memory.
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SETD.0 0x80 0x00
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DPUP.0 0d06
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LDA.0
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OUTA 0xE4
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INCD.0
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LDA.0
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OUTA 0xE5
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SETD.0 0x80 0x00
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DPUP.0 0d10
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LDA.0
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OUTA 0xE6
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INCD.0
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LDA.0
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OUTA 0xE7
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INIA 0x01
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OUTA 0xE8 ; Blit.
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; Then the data. A blit leaves its addresses past whatever it touched, so the source is
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; already sitting on the first byte of the data and only the destination changes.
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INIA 0d1
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OUTA 0xE3 ; DestBank: Data Memory.
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SETD.0 0x80 0x00
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DPUP.0 0d12
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LDA.0
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OUTA 0xE4
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INCD.0
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LDA.0
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OUTA 0xE5
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SETD.0 0x80 0x00
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DPUP.0 0d14
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LDA.0
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OUTA 0xE6
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INCD.0
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LDA.0
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OUTA 0xE7
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INIA 0x01
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OUTA 0xE8 ; Blit.
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; Where it starts. Written out by hand rather than through a routine, because a routine
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; could not hand two bytes back: CALL puts A, B and the first three pointers back the
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; way it found them.
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SETD.0 0x80 0x00
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DPUP.0 0d08
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LDA.0
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SETD.1 LoadedEntry
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STA.1
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INCD.0
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INCD.1
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LDA.0
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STA.1
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INIA 0x01
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SETD.0 LoadedOk
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STA.0
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SETD.0 LoadedText
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CALL printString
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SETD.0 LoadedEntry
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CALL printWordHex
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CALL newLine
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BRI prompt
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loadNoDisk:
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SETD.0 NoDisk
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BRI loadComplain
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loadNothingNamed:
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SETD.0 LoadWhat
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BRI loadComplain
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loadMissing:
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SETD.0 NoSuchFile
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BRI loadComplain
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loadUnreadable:
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SETD.0 Unreadable
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BRI loadComplain
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loadNotProgram:
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SETD.0 NotProgram
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BRI loadComplain
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loadWrongVersion:
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SETD.0 WrongVersion
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loadComplain:
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CALL printString
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CALL newLine
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BRI prompt
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; ---- run ----
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;
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; Hands the machine to whatever was loaded. Where the Stack is now is written down first,
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; because the program is not going to unwind anything it pushes and the exit handler has
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; to be able to put the Stack back.
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doRun:
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SETD.0 LoadedOk
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LDA.0
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BRA runNothing
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MVSD.0
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SETD.1 SystemStack
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STD.0.1
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; The entry address is a number until BRD makes it a place. DP3 is the one to build it
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; in, because it is the pointer nothing puts back.
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SETD.1 LoadedEntry
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LDD.3.1
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BRD.3
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runNothing:
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SETD.0 NothingLoaded
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CALL printString
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CALL newLine
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BRI prompt
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; ---- The services ----
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;
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; These are what a loaded program is allowed to ask for. The names and their numbers come
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; from services.asm, which the programs include as well, so neither side writes a number
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; down and the two cannot disagree about them.
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;
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; A handler arrives with the caller's registers exactly as they were: an interrupt frame
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; is pushed, not cleared. So the pointer a program put in DP0 is still there to be used.
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handlePrintString:
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CALL printString
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RETI
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handleReadLine:
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CALL readLine
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RETI
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; Giving the machine back. This is the one place MVDS earns its keep. The program's Stack,
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; and the frame this very interrupt arrived on, are both abandoned where they lie, because
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; nothing is going to return through either of them.
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;
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; Which is exactly why this cannot RETI. Its return address is on the Stack it just walked
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; away from, so it branches to the prompt instead.
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handleExit:
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SETD.1 SystemStack
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LDD.0.1
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MVDS.0
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; The console goes back to line mode whatever the program left it in. A program that
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; wanted keys is expected to put it back itself, but one that stopped early, or forgot,
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; would otherwise hand back a shell with no echo and no backspace, and the shell has no
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; way to find out that happened. Writing line mode when it is already in line mode costs
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; a byte out of a port and does nothing, which is the right price for not having to know.
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RSTA
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OUTA 0x02
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SETD.0 Finished
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CALL printString
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CALL newLine
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BRI prompt
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; ---- dump ----
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;
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; dump Sixty four more bytes, carrying on from the last one.
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; dump <where> From the start of that bank.
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; dump <where> <addr> From there.
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;
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; <where> is program, data, or a bank number in hexadecimal. That the CPU cannot read
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||||
; Program Memory and this can is the whole point: the instruction set has no way to look
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; at itself, and the controller does, so a monitor is possible at all only through it.
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doDump:
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SETD.1 TextRest
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LDD.0.1
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LDA.0
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BRA dumpGo ; Nothing said, so carry on from where the last one stopped.
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; Which bank. The two that always exist have names, because typing "program" is what
|
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; somebody means and 0 is what the machine calls it.
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CALL textSplit
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SETD.1 ProgramWord
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CALL textSame
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BRQ dumpBankProgram
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SETD.1 DataWord
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CALL textSame
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BRQ dumpBankData
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CALL textHexWord
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BNQ dumpBadWhere
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SETD.0 TextValue
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INCD.0
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LDA.0
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BRI dumpSetBank
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dumpBankProgram:
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RSTA
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BRI dumpSetBank
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dumpBankData:
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INIA 0d1
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dumpSetBank:
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SETD.0 DumpBank
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STA.0
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||||
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||||
; And where in it. Naming a bank without an address means the start of it, which is the
|
||||
; only answer that does not depend on what was asked for last time.
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RSTA
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SETD.0 DumpAt
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||||
STA.0
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||||
INCD.0
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||||
STA.0
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||||
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||||
SETD.1 TextRest
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||||
LDD.0.1
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||||
LDA.0
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||||
BRA dumpCheckBank
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||||
CALL textHexWord
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||||
BNQ dumpBadWhere
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||||
SETD.0 TextValue
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||||
LDA.0
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||||
SETD.1 DumpAt
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STA.1
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||||
SETD.0 TextValue
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||||
INCD.0
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||||
LDA.0
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SETD.1 DumpAt
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||||
INCD.1
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||||
STA.1
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||||
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||||
dumpCheckBank:
|
||||
; Is there such a bank? Asking the controller for a bank that is not there is refused,
|
||||
; and a refusal nobody catches stops the machine, which is a poor answer to a typing
|
||||
; mistake. The bank table says what exists, and it lives in bank 2.
|
||||
;
|
||||
; Bank n's record starts at n times eight. A and B are a shift register sixteen bits
|
||||
; wide, so putting the number in the low half and rotating left three times multiplies
|
||||
; it by eight without anything falling off the top: the most it can reach is 2040.
|
||||
RSTA
|
||||
SETD.0 DumpBank
|
||||
LDB.0
|
||||
SHL SHL SHL
|
||||
SETD.0 DumpRecord
|
||||
STA.0
|
||||
INCD.0
|
||||
STB.0
|
||||
|
||||
INIA 0d2
|
||||
OUTA 0xE0 ; SourceBank: the controller's own memory.
|
||||
SETD.0 DumpRecord
|
||||
LDA.0
|
||||
OUTA 0xE1
|
||||
INCD.0
|
||||
LDA.0
|
||||
OUTA 0xE2
|
||||
INA 0xE9 ; The flags byte of that bank's record.
|
||||
INIB 0x01
|
||||
AND
|
||||
BRQ dumpNoBank ; The present bit is down, so nothing is there.
|
||||
|
||||
dumpGo:
|
||||
INIA 0d4
|
||||
SETD.0 DumpRows
|
||||
STA.0
|
||||
|
||||
dumpRow:
|
||||
SETD.0 DumpAt
|
||||
CALL printWordHex
|
||||
INIA 0d2
|
||||
CALL printSpaces
|
||||
|
||||
; Point the controller at the row. Reading the Data port takes a byte and steps the
|
||||
; source on, so the whole row is one instruction repeated.
|
||||
SETD.0 DumpBank
|
||||
LDA.0
|
||||
OUTA 0xE0
|
||||
SETD.0 DumpAt
|
||||
LDA.0
|
||||
OUTA 0xE1
|
||||
INCD.0
|
||||
LDA.0
|
||||
OUTA 0xE2
|
||||
|
||||
; Sixteen bytes, kept as they go past so that they can be shown twice.
|
||||
INIA 0d16
|
||||
SETD.0 DumpCount
|
||||
STA.0
|
||||
SETD.1 DumpBytes
|
||||
dumpByte:
|
||||
INA 0xE9
|
||||
STA.1
|
||||
CALL printByteHex
|
||||
INIA 0x20
|
||||
OUTA 0x00
|
||||
INCD.1
|
||||
SETD.0 DumpCount
|
||||
LDA.0
|
||||
DECA
|
||||
STA.0
|
||||
BNA dumpByte
|
||||
|
||||
; The same sixteen again, as characters. Anything that is not printable shows as a dot,
|
||||
; because a control character sent to the console would move the cursor and ruin the
|
||||
; shape of the dump.
|
||||
INIA 0x20
|
||||
OUTA 0x00
|
||||
INIA 0d16
|
||||
SETD.0 DumpCount
|
||||
STA.0
|
||||
SETD.1 DumpBytes
|
||||
dumpChar:
|
||||
LDA.1
|
||||
INIB 0x20
|
||||
CCF
|
||||
SUB
|
||||
BRC dumpDot ; Below a space.
|
||||
INIB 0x7F
|
||||
CCF
|
||||
SUB
|
||||
BNC dumpDot ; Delete, or above it.
|
||||
OUTA 0x00
|
||||
BRI dumpCharNext
|
||||
dumpDot:
|
||||
INIA 0x2E
|
||||
OUTA 0x00
|
||||
dumpCharNext:
|
||||
INCD.1
|
||||
SETD.0 DumpCount
|
||||
LDA.0
|
||||
DECA
|
||||
STA.0
|
||||
BNA dumpChar
|
||||
CALL newLine
|
||||
|
||||
; Sixteen further along, carrying into the high byte if the low one wrapped.
|
||||
SETD.0 DumpAt
|
||||
INCD.0
|
||||
LDA.0
|
||||
INIB 0d16
|
||||
CCF
|
||||
ADD
|
||||
STQ.0
|
||||
BNC dumpRowNext
|
||||
SETD.0 DumpAt
|
||||
LDA.0
|
||||
INCA
|
||||
STA.0
|
||||
dumpRowNext:
|
||||
SETD.0 DumpRows
|
||||
LDA.0
|
||||
DECA
|
||||
STA.0
|
||||
BNA dumpRow
|
||||
BRI prompt
|
||||
|
||||
dumpBadWhere:
|
||||
SETD.0 DumpUsage
|
||||
CALL printString
|
||||
CALL newLine
|
||||
BRI prompt
|
||||
dumpNoBank:
|
||||
SETD.0 NoSuchBank
|
||||
CALL printString
|
||||
CALL newLine
|
||||
BRI prompt
|
||||
|
||||
; ---- help ----
|
||||
|
||||
doHelp:
|
||||
SETD.0 HelpText
|
||||
CALL printString
|
||||
CALL newLine
|
||||
SETD.0 HelpMoreText
|
||||
CALL printString
|
||||
CALL newLine
|
||||
BRI prompt
|
||||
|
||||
#Data
|
||||
|
||||
Banner:
|
||||
"CosmOS"
|
||||
PromptText:
|
||||
"> "
|
||||
NoDisk:
|
||||
"no filesystem on the disk"
|
||||
Unknown:
|
||||
"I do not know: "
|
||||
Farewell:
|
||||
"halted"
|
||||
FilesText:
|
||||
" files"
|
||||
|
||||
; Two strings rather than one, because a string literal stops at 255 characters and each
|
||||
; one carries its own zero byte, so they are printed in turn rather than joined.
|
||||
HelpText:
|
||||
"dir list what is on the disk
|
||||
load <file> read a program off the disk
|
||||
run start what was loaded"
|
||||
HelpMoreText:
|
||||
"dump sixty four bytes of memory, and again for more
|
||||
dump <program|data|bank> <address>
|
||||
help this
|
||||
exit stop"
|
||||
|
||||
DumpUsage:
|
||||
"dump <program|data|bank> <address>"
|
||||
NoSuchBank:
|
||||
"there is no such bank"
|
||||
ProgramWord:
|
||||
"program"
|
||||
DataWord:
|
||||
"data"
|
||||
DumpName:
|
||||
"dump"
|
||||
|
||||
ExecMagic:
|
||||
"SBEX"
|
||||
LoadWhat:
|
||||
"load what?"
|
||||
NoSuchFile:
|
||||
"no such file"
|
||||
Unreadable:
|
||||
"could not read it"
|
||||
NotProgram:
|
||||
"not a program"
|
||||
WrongVersion:
|
||||
"a version I do not know"
|
||||
LoadedText:
|
||||
"loaded, starting at "
|
||||
NothingLoaded:
|
||||
"nothing is loaded"
|
||||
Finished:
|
||||
"finished"
|
||||
|
||||
DirName:
|
||||
"dir"
|
||||
LoadName:
|
||||
"load"
|
||||
RunName:
|
||||
"run"
|
||||
HelpName:
|
||||
"help"
|
||||
ExitName:
|
||||
"exit"
|
||||
|
||||
DiskReady:
|
||||
0x00
|
||||
LoadedOk:
|
||||
0x00
|
||||
LoadedEntry:
|
||||
0x00 0x00
|
||||
LoadCount:
|
||||
0x00
|
||||
|
||||
; Where the monitor is looking, so that a bare 'dump' can carry on from it.
|
||||
DumpBank:
|
||||
0x00
|
||||
DumpAt:
|
||||
0x00 0x00
|
||||
DumpRows:
|
||||
0x00
|
||||
DumpCount:
|
||||
0x00
|
||||
DumpRecord:
|
||||
0x00 0x00
|
||||
DumpBytes:
|
||||
#Reserve 0d16
|
||||
|
||||
; Where the system's Stack was when it handed the machine to a program. Kept below the
|
||||
; region a program owns, so that a program has to go looking to break it.
|
||||
SystemStack:
|
||||
0x00 0x00
|
||||
DirSeen:
|
||||
0x00
|
||||
DirSize:
|
||||
0x00 0x00
|
||||
WidthLeft:
|
||||
0x00
|
||||
|
||||
; Sixty three characters and the zero byte that ends them.
|
||||
CommandLine:
|
||||
#Reserve 0d64
|
||||
|
||||
#Vectors
|
||||
|
||||
Boot boot
|
||||
osPrintString handlePrintString
|
||||
osReadLine handleReadLine
|
||||
osExit handleExit
|
||||
Reference in New Issue
Block a user