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blockdev: make implementors "random access"

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This huge refactoring remove the Seek and Tell routine from blockdev
implementation requirements and change GetC and PutC's API so that they
take an address to read and write (through HL/DE) at each call.

The "PTR" approach in blockdev implementation was very redundant from
device to device and it made more sense to generalize. It's possible
that future device aren't "random access", but we'll be able to add more
device types later.

Another important change in this commit is that the "blockdev handle" is
now opaque. Previously, consumers of the API would happily call routines
directly from one of the 4 offsets. We can't do that any more. This
makes the API more solid for future improvements.

This change forced me to change a lot of things in fs, but overall,
things are now simpler. No more `FS_PTR`: the "device handle" now holds
the active pointer.

Lots, lots of changes, but it also feels a lot cleaner and solid.
This commit is contained in:
Virgil Dupras 2019-06-04 11:53:02 -04:00
parent 63473cc2e3
commit ae028e3a86
24 changed files with 460 additions and 457 deletions
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15
apps/zasm/const.asm
View File

@ -1,24 +1,25 @@
; *** Errors ***
; We start error at 0x10 to avoid overlapping with shell errors
; Unknown instruction or directive
.equ ERR_UNKNOWN 0x01
.equ ERR_UNKNOWN 0x11
; Bad argument: Doesn't match any constant argspec or, if an expression,
; contains references to undefined symbols.
.equ ERR_BAD_ARG 0x02
.equ ERR_BAD_ARG 0x12
; Code is badly formatted (comma without a following arg, unclosed quote, etc.)
.equ ERR_BAD_FMT 0x03
.equ ERR_BAD_FMT 0x13
; Value specified doesn't fit in its destination byte or word
.equ ERR_OVFL 0x04
.equ ERR_OVFL 0x14
.equ ERR_FILENOTFOUND 0x05
.equ ERR_FILENOTFOUND 0x15
; Duplicate symbol
.equ ERR_DUPSYM 0x06
.equ ERR_DUPSYM 0x16
; Out of memory
.equ ERR_OOM 0x07
.equ ERR_OOM 0x17
; *** Other ***
.equ ZASM_DEBUG_PORT 42

5
apps/zasm/glue.asm
View File

@ -38,7 +38,12 @@
; fsTell
; cpHLDE
; parseArgs
; _blkGetC
; _blkPutC
; _blkSeek
; _blkTell
; FS_HANDLE_SIZE
; BLOCKDEV_SIZE
; *** Variables ***

30
apps/zasm/io.asm
View File

@ -40,16 +40,10 @@
; flag and continue on the general IN stream.
; *** Variables ***
.equ IO_IN_GETC IO_RAMSTART
.equ IO_IN_PUTC IO_IN_GETC+2
.equ IO_IN_SEEK IO_IN_PUTC+2
.equ IO_IN_TELL IO_IN_SEEK+2
.equ IO_OUT_GETC IO_IN_TELL+2
.equ IO_OUT_PUTC IO_OUT_GETC+2
.equ IO_OUT_SEEK IO_OUT_PUTC+2
.equ IO_OUT_TELL IO_OUT_SEEK+2
.equ IO_IN_BLK IO_RAMSTART
.equ IO_OUT_BLK IO_IN_BLK+BLOCKDEV_SIZE
; Save pos for ioSavePos and ioRecallPos
.equ IO_SAVED_POS IO_OUT_TELL+2
.equ IO_SAVED_POS IO_OUT_BLK+BLOCKDEV_SIZE
; File handle for included source
.equ IO_INCLUDE_HDL IO_SAVED_POS+2
; see ioPutBack below
@ -108,8 +102,8 @@ ioGetC:
; continue on to "normal" reading. We don't want to return our zero
.normalmode:
; normal mode, read from IN stream
ld ix, (IO_IN_GETC)
call _callIX
ld ix, IO_IN_BLK
call _blkGetC
cp 0x0a ; newline
ret nz ; not newline? return
; inc current lineno
@ -132,7 +126,7 @@ _callIX:
ret
; Put back non-zero character A into the "ioGetC stack". The next ioGetC call,
; instead of reading from IO_IN_GETC, will return that character. That's the
; instead of reading from IO_IN_BLK, will return that character. That's the
; easiest way I found to handle the readWord/gotoNextLine problem.
ioPutBack:
ld (IO_PUTBACK_BUF), a
@ -148,8 +142,8 @@ ioPutC:
call zasmIsFirstPass
jr z, .skip
pop af
ld ix, (IO_OUT_PUTC)
jp (ix)
ld ix, IO_OUT_BLK
jp _blkPutC
.skip:
pop af
ret
@ -184,8 +178,8 @@ _ioSeek:
ld a, 0 ; don't alter flags
jr nz, .include
; normal mode, seek in IN stream
ld ix, (IO_IN_SEEK)
jp (ix)
ld ix, IO_IN_BLK
jp _blkSeek
.include:
; We're in "include mode", seek in FS
ld ix, IO_INCLUDE_HDL
@ -195,8 +189,8 @@ _ioTell:
call ioInInclude
jp nz, .include
; normal mode, seek in IN stream
ld ix, (IO_IN_TELL)
jp (ix)
ld ix, IO_IN_BLK
jp _blkTell
.include:
; We're in "include mode", tell from FS
ld ix, IO_INCLUDE_HDL

4
apps/zasm/main.asm
View File

@ -38,10 +38,10 @@ zasmMain:
; HL now points to parsed args
; Init I/O
ld a, (ZASM_RAMSTART) ; blkdev in ID
ld de, IO_IN_GETC
ld de, IO_IN_BLK
call blkSel
ld a, (ZASM_RAMSTART+1) ; blkdev out ID
ld de, IO_OUT_GETC
ld de, IO_OUT_BLK
call blkSel
; Init modules

246
kernel/blockdev.asm
View File

@ -6,39 +6,27 @@
; then the glue code assigns a blockdev ID to that device. It then becomes easy
; to access arbitrary devices in a convenient manner.
;
; This part exposes a new "bsel" command to select the currently active block
; device.
; This module exposes a seek/tell/getc/putc API that is then re-routed to
; underlying drivers. There will eventually be more than one driver type, but
; for now we sit on only one type of driver: random access driver.
;
; *** Blockdev routines ***
; *** Random access drivers ***
;
; There are 4 blockdev routines that can be defined by would-be block devices
; and they follow these specifications:
; Random access drivers are expected to supply two routines: GetC and PutC.
;
; GetC:
; Reads one character from selected device and returns its value in A.
; Reads one character at address specified in DE/HL and returns its value in A.
; Sets Z according to whether read was successful: Set if successful, unset
; if not.
;
; A successful GetC should advance the "pointer" of the device (if there is one)
; by one byte so that a subsequent GetC will read the next char. Unsuccessful
; reads generally mean that we reached EOF.
;
; Unsuccessful reads generally mean that requested addr is out of bounds (we
; reached EOF).
;
; PutC:
; Writes character in A in current position in the selected device. Sets Z
; according to whether the operation was successful.
; Writes character in A at address specified in DE/HL. Sets Z according to
; whether the operation was successful.
;
; A successful PutC should advance the "pointer" of the device (if there is one)
; by one byte so that the next PutC places the next char next to this one.
; Unsuccessful writes generally mean that we reached EOF.
;
; Seek:
; Place device "pointer" at position dictated by HL (low 16 bits) and DE (high
; 16 bits).
;
; Tell:
; Return the position of the "pointer" in HL (low 16 bits) and DE (high 16
; bits).
; Unsuccessful writes generally mean that we're out of bounds for writing.
;
; All routines are expected to preserve unused registers.
@ -47,20 +35,18 @@
; BLOCKDEV_COUNT: The number of devices we manage.
; *** CONSTS ***
.equ BLOCKDEV_ERR_OUT_OF_BOUNDS 0x03
.equ BLOCKDEV_SEEK_ABSOLUTE 0
.equ BLOCKDEV_SEEK_FORWARD 1
.equ BLOCKDEV_SEEK_BACKWARD 2
.equ BLOCKDEV_SEEK_BEGINNING 3
.equ BLOCKDEV_SEEK_END 4
.equ BLOCKDEV_SIZE 8
; *** VARIABLES ***
; Pointer to the selected block device. A block device is a 8 bytes block of
; memory with pointers to GetC, PutC, Seek and Tell routines, in that order.
; 0 means unsupported.
; memory with pointers to GetC, PutC, and a 32-bit counter, in that order.
.equ BLOCKDEV_SEL BLOCKDEV_RAMSTART
.equ BLOCKDEV_RAMEND BLOCKDEV_SEL+8
.equ BLOCKDEV_RAMEND BLOCKDEV_SEL+BLOCKDEV_SIZE
; *** CODE ***
; Select block index specified in A and place them in routine pointers at (DE).
@ -73,62 +59,94 @@ blkSel:
ld hl, blkDevTbl
or a ; cp 0
jr z, .afterloop ; index is zero? don't loop
push bc
ld b, a
.loop:
ld a, 8
call addHL
djnz .loop
pop bc
push bc ; <|
ld b, a ; |
.loop: ; |
ld a, 4 ; |
call addHL ; |
djnz .loop ; |
pop bc ; <|
.afterloop:
push hl
call intoHL
call writeHLinDE
inc de
inc de
pop hl
inc hl
inc hl
push hl
call intoHL
call writeHLinDE
inc de
inc de
pop hl
inc hl
inc hl
push hl
call intoHL
call writeHLinDE
inc de
inc de
pop hl
; Write GETC
push hl ; <|
call intoHL ; |
call writeHLinDE ; |
inc de ; |
inc de ; |
pop hl ; <|
inc hl
inc hl
; Write PUTC
call intoHL
call writeHLinDE
inc de
inc de
; Initialize pos
xor a
ld (de), a
inc de
ld (de), a
inc de
ld (de), a
inc de
ld (de), a
pop hl
pop de
pop af
ret
_blkInc:
ret nz ; don't advance when in error condition
push af
push hl
ld a, BLOCKDEV_SEEK_FORWARD
ld hl, 1
call _blkSeek
pop hl
pop af
ret
; Reads one character from selected device and returns its value in A.
; Sets Z according to whether read was successful: Set if successful, unset
; if not.
blkGetC:
ld ix, (BLOCKDEV_SEL)
jp (ix)
ld ix, BLOCKDEV_SEL
_blkGetC:
push hl
push de
call _blkTell
call callIXI
pop de
pop hl
jr _blkInc ; advance and return
; Writes character in A in current position in the selected device. Sets Z
; according to whether the operation was successful.
blkPutC:
ld ix, BLOCKDEV_SEL
_blkPutC:
push ix
push hl
push de
call _blkTell
inc ix ; make IX point to PutC
inc ix
call callIXI
pop de
pop hl
pop ix
jr _blkInc ; advance and return
; Reads B chars from blkGetC and copy them in (HL).
; Sets Z if successful, unset Z if there was an error.
blkRead:
ld ix, (BLOCKDEV_SEL)
ld ix, BLOCKDEV_SEL
_blkRead:
push hl
push bc
.loop:
call callIX
call _blkGetC
jr nz, .end ; Z already unset
ld (hl), a
inc hl
@ -139,26 +157,16 @@ _blkRead:
pop hl
ret
; Writes character in A in current position in the selected device. Sets Z
; according to whether the operation was successful.
blkPutC:
ld ix, (BLOCKDEV_SEL+2)
jp (ix)
; Writes B chars to blkPutC from (HL).
; Sets Z if successful, unset Z if there was an error.
blkWrite:
ld ix, (BLOCKDEV_SEL)
ld ix, BLOCKDEV_SEL
_blkWrite:
push ix
push hl
push bc
; make IX point to PutC
inc ix
inc ix
.loop:
ld a, (hl)
call callIX
call _blkPutC
jr nz, .end ; Z already unset
inc hl
djnz .loop
@ -166,7 +174,6 @@ _blkWrite:
.end:
pop bc
pop hl
pop ix
ret
; Seeks the block device in one of 5 modes, which is the A argument:
@ -186,12 +193,8 @@ _blkWrite:
; If the device is "growable", it's possible that seeking to end when calling
; PutC doesn't necessarily result in a failure.
blkSeek:
ld ix, (BLOCKDEV_SEL+4)
ld iy, (BLOCKDEV_SEL+6)
ld ix, BLOCKDEV_SEL
_blkSeek:
; we preserve DE so that it's possible to call blkSeek in mode != 0
; while not discarding our current DE value.
push de
cp BLOCKDEV_SEEK_FORWARD
jr z, .forward
cp BLOCKDEV_SEEK_BACKWARD
@ -201,43 +204,70 @@ _blkSeek:
cp BLOCKDEV_SEEK_END
jr z, .end
; all other modes are considered absolute
jr .seek ; for absolute mode, HL and DE are already
; correct
ld (ix+4), e
ld (ix+5), d
ld (ix+6), l
ld (ix+7), h
ret
.forward:
push bc
push hl
; We want to be able to plug our own TELL function, which is why we
; don't call blkTell directly here.
; Calling TELL
ld de, 0 ; in case out Tell routine doesn't return DE
call callIY ; HL/DE now have our curpos
pop bc ; pop HL into BC
add hl, bc
pop bc ; pop orig BC back
jr nc, .seek ; no carry? let's seek.
; carry, adjust DE
inc de
jr .seek
push bc ; <-|
push hl ; <||
ld l, (ix+6) ; || low byte
ld h, (ix+7) ; ||
pop bc ; <||
add hl, bc ; |
pop bc ; <-|
ld (ix+6), l
ld (ix+7), h
ret nc ; no carry? no need to adjust high byte
; carry, adjust high byte
inc (ix+4)
ret nz
inc (ix+5)
ret
.backward:
; TODO - subtraction are more complicated...
jr .seek
and a ; clear carry
push bc ; <-|
push hl ; <||
ld l, (ix+6) ; || low byte
ld h, (ix+7) ; ||
pop bc ; <||
sbc hl, bc ; |
pop bc ; <-|
ld (ix+6), l
ld (ix+7), h
ret nc ; no carry? no need to adjust high byte
ld a, 0xff
dec (ix+4)
cp (ix+4)
ret nz
; we decremented from 0
dec (ix+5)
ret
.beginning:
ld hl, 0
ld de, 0
jr .seek
xor a
ld (ix+4), a
ld (ix+5), a
ld (ix+6), a
ld (ix+7), a
ret
.end:
ld hl, 0xffff
ld de, 0xffff
.seek:
call callIX
pop de
ld a, 0xff
ld (ix+4), a
ld (ix+5), a
ld (ix+6), a
ld (ix+7), a
ret
; Returns the current position of the selected device in HL (low) and DE (high).
blkTell:
ld de, 0 ; in case device ignores DE.
ld ix, (BLOCKDEV_SEL+6)
jp (ix)
ld ix, BLOCKDEV_SEL
_blkTell:
ld e, (ix+4)
ld d, (ix+5)
ld l, (ix+6)
ld h, (ix+7)
ret
; This label is at the end of the file on purpose: the glue file should include
; a list of device routine table entries just after the include. Each line

17
kernel/core.asm
View File

@ -47,6 +47,14 @@ intoHL:
pop de
ret
intoIX:
push de
push ix \ pop de
call intoDE
push de \ pop ix
pop de
ret
; add the value of A into HL
addHL:
push af
@ -94,6 +102,15 @@ writeHLinDE:
pop af
ret
; Call the method (IX) is a pointer to. In other words, call intoIX before
; callIX
callIXI:
push ix
call intoIX
call callIX
pop ix
ret
; jump to the location pointed to by IX. This allows us to call IX instead of
; just jumping it. We use IX because we seldom use this for arguments.
callIX:

3
kernel/err.h
View File

@ -6,6 +6,9 @@
; Arguments for the command weren't properly formatted
.equ SHELL_ERR_BAD_ARGS 0x02
.equ BLOCKDEV_ERR_OUT_OF_BOUNDS 0x03
.equ BLOCKDEV_ERR_UNSUPPORTED 0x04
; IO routines (GetC, PutC) returned an error in a load/save command
.equ SHELL_ERR_IO_ERROR 0x05

141
kernel/fs.asm
View File

@ -93,23 +93,16 @@
.equ FS_ERR_NOT_FOUND 0x6
; *** VARIABLES ***
; A copy of BLOCKDEV routines when the FS was mounted. 0 if no FS is mounted.
.equ FS_GETC FS_RAMSTART
.equ FS_PUTC FS_GETC+2
.equ FS_SEEK FS_PUTC+2
.equ FS_TELL FS_SEEK+2
; A copy of BLOCKDEV_SEL when the FS was mounted. 0 if no FS is mounted.
.equ FS_BLK FS_RAMSTART
; Offset at which our FS start on mounted device
; This pointer is 32 bits. 32 bits pointers are a bit awkward: first two bytes
; are high bytes *low byte first*, and then the low two bytes, same order.
; When loaded in HL/DE, the four bytes are loaded in this order: E, D, L, H
.equ FS_START FS_TELL+2
; Offset at which we are currently pointing to with regards to our routines
; below, which all assume this offset as a context. This offset is not relative
; to FS_START. It can be used directly with fsblkSeek. 32 bits.
.equ FS_PTR FS_START+4
; This variable below contain the metadata of the last block FS_PTR was moved
.equ FS_START FS_BLK+BLOCKDEV_SIZE
; This variable below contain the metadata of the last block we moved
; to. We read this data in memory to avoid constant seek+read operations.
.equ FS_META FS_PTR+4
.equ FS_META FS_START+4
.equ FS_HANDLES FS_META+FS_METASIZE
.equ FS_RAMEND FS_HANDLES+FS_HANDLE_COUNT*FS_HANDLE_SIZE
@ -121,21 +114,27 @@ P_FS_MAGIC:
fsInit:
xor a
ld hl, FS_GETC
ld b, FS_RAMEND-FS_GETC
ld hl, FS_BLK
ld b, FS_RAMEND-FS_BLK
call fill
ret
; *** Navigation ***
; Resets FS_PTR to the beginning. Errors out if no FS is mounted.
; Seek to the beginning. Errors out if no FS is mounted.
; Sets Z if success, unset if error
fsBegin:
call fsIsOn
ret nz
push hl
ld hl, (FS_START)
ld (FS_PTR), hl
push de
push af
ld de, (FS_START)
ld hl, (FS_START+2)
ld (FS_PTR+2), hl
ld a, BLOCKDEV_SEEK_ABSOLUTE
call fsblkSeek
pop af
pop de
pop hl
call fsReadMeta
jp fsIsValid ; sets Z, returns
@ -147,25 +146,20 @@ fsNext:
push bc
push hl
ld a, (FS_META+FS_META_ALLOC_OFFSET)
cp 0
or a ; cp 0
jr z, .error ; if our block allocates 0 blocks, this is the
; end of the line.
call fsPlace
ld b, a ; we will seek A times
.loop:
ld a, BLOCKDEV_SEEK_FORWARD
ld hl, FS_BLOCKSIZE
call fsblkSeek
djnz .loop
; Good, were here. We're going to read meta from our current position.
call fsblkTell ; --> HL, --> DE
ld (FS_PTR), de
ld (FS_PTR+2), hl
call fsReadMeta
jr nz, .createChainEnd
call fsIsValid
jr nz, .createChainEnd
; We're good! We have a valid FS block and FS_PTR is already updated.
; We're good! We have a valid FS block.
; Meta is already read. Nothing to do!
cp a ; ensure Z
jr .end
@ -183,10 +177,9 @@ fsNext:
pop bc
ret
; Reads metadata at current FS_PTR and place it in FS_META.
; Returns Z according to whether the fsblkRead operation succeeded.
; Reads metadata at current fsblk and place it in FS_META.
; Returns Z according to whether the operation succeeded.
fsReadMeta:
call fsPlace
push bc
push hl
ld b, FS_METASIZE
@ -194,12 +187,13 @@ fsReadMeta:
call fsblkRead ; Sets Z
pop hl
pop bc
ret
ret nz
; Only rewind on success
jr _fsRewindAfterMeta
; Writes metadata in FS_META at current FS_PTR.
; Writes metadata in FS_META at current fsblk.
; Returns Z according to whether the fsblkWrite operation succeeded.
fsWriteMeta:
call fsPlace
push bc
push hl
ld b, FS_METASIZE
@ -207,6 +201,19 @@ fsWriteMeta:
call fsblkWrite ; Sets Z
pop hl
pop bc
ret nz
; Only rewind on success
jr _fsRewindAfterMeta
_fsRewindAfterMeta:
; return back to before the read op
push af
push hl
ld a, BLOCKDEV_SEEK_BACKWARD
ld hl, FS_METASIZE
call fsblkSeek
pop hl
pop af
ret
; Initializes FS_META with "CFS" followed by zeroes
@ -229,20 +236,6 @@ fsInitMeta:
pop af
ret
; Make sure that our underlying blockdev is correctly placed.
fsPlace:
push af
push hl
push de
xor a
ld de, (FS_PTR)
ld hl, (FS_PTR+2)
call fsblkSeek
pop de
pop hl
pop af
ret
; Create a new file with A blocks allocated to it and with its new name at
; (HL).
; Before doing so, enumerate all blocks in search of a deleted file with
@ -250,7 +243,7 @@ fsPlace:
; if the allocated space asked is exactly the same, or of it isn't, split the
; free space in 2 and create a new deleted metadata block next to the newly
; created block.
; Places FS_PTR to the newly allocated block. You have to write the new
; Places fsblk to the newly allocated block. You have to write the new
; filename yourself.
fsAlloc:
push bc
@ -272,8 +265,6 @@ fsAlloc:
; TODO: handle case where C < A (block splitting)
jr .loop1
.found:
call fsPlace ; Make sure that our block device points to
; the beginning of our FS block
; We've reached last block. Two situations are possible at this point:
; 1 - the block is the "end of line" block
; 2 - the block is a deleted block that we we're re-using.
@ -287,11 +278,7 @@ fsAlloc:
ld de, FS_META+FS_META_FNAME_OFFSET
ld bc, FS_MAX_NAME_SIZE
ldir
; Good, FS_META ready. Now, let's update FS_PTR because it hasn't been
; changed yet.
call fsblkTell
ld (FS_PTR), de
ld (FS_PTR+2), hl
; Good, FS_META ready.
; Ok, now we can write our metadata
call fsWriteMeta
.end:
@ -299,7 +286,7 @@ fsAlloc:
pop bc
ret
; Place FS_PTR to the filename with the name in (HL).
; Place fsblk to the filename with the name in (HL).
; Sets Z on success, unset when not found.
fsFindFN:
push de
@ -348,47 +335,43 @@ fsIsDeleted:
fsblkGetC:
push ix
ld ix, (FS_GETC)
call callIX
ld ix, FS_BLK
call _blkGetC
pop ix
ret
fsblkRead:
push ix
ld ix, (FS_GETC)
ld ix, FS_BLK
call _blkRead
pop ix
ret
fsblkPutC:
push ix
ld ix, (FS_PUTC)
call callIX
ld ix, FS_BLK
call _blkPutC
pop ix
ret
fsblkWrite:
push ix
ld ix, (FS_GETC) ; we have to point to blkdev's beginning
ld ix, FS_BLK
call _blkWrite
pop ix
ret
fsblkSeek:
push ix
push iy
ld ix, (FS_SEEK)
ld iy, (FS_TELL)
ld ix, FS_BLK
call _blkSeek
pop iy
pop ix
ret
fsblkTell:
push ix
ld de, 0
ld ix, (FS_TELL)
call callIX
ld ix, FS_BLK
call _blkTell
pop ix
ret
@ -399,13 +382,13 @@ fsOpen:
push hl
push af
; Starting pos
ld a, (FS_PTR)
ld a, (FS_BLK+4)
ld (ix), a
ld a, (FS_PTR+1)
ld a, (FS_BLK+5)
ld (ix+1), a
ld a, (FS_PTR+2)
ld a, (FS_BLK+6)
ld (ix+2), a
ld a, (FS_PTR+3)
ld a, (FS_BLK+7)
ld (ix+3), a
; Current pos
ld hl, FS_METASIZE
@ -516,7 +499,7 @@ fsTell:
; Mount the fs subsystem upon the currently selected blockdev at current offset.
; Verify is block is valid and error out if its not, mounting nothing.
; Upon mounting, copy currently selected device in FS_GETC/PUTC/SEEK/TELL.
; Upon mounting, copy currently selected device in FS_BLK.
fsOn:
push hl
push de
@ -524,14 +507,12 @@ fsOn:
; We have to set blkdev routines early before knowing whether the
; mounting succeeds because methods like fsReadMeta uses fsblk* methods.
ld hl, BLOCKDEV_SEL
ld de, FS_GETC
ld bc, 8 ; we have 8 bytes to copy
ld de, FS_BLK
ld bc, BLOCKDEV_SIZE
ldir ; copy!
call fsblkTell
ld (FS_START), de
ld (FS_START+2), hl
ld (FS_PTR), de
ld (FS_PTR+2), hl
call fsReadMeta
jr nz, .error
call fsIsValid
@ -542,8 +523,8 @@ fsOn:
.error:
; couldn't mount. Let's reset our variables.
xor a
ld b, FS_META-FS_GETC ; reset routine pointers and FS ptrs
ld hl, FS_GETC
ld b, FS_META-FS_BLK ; reset routine pointers and FS ptrs
ld hl, FS_BLK
call fill
ld a, FS_ERR_NO_FS
@ -555,10 +536,10 @@ fsOn:
; Sets Z according to whether we have a filesystem mounted.
fsIsOn:
; check whether (FS_GETC) is zero
; check whether (FS_BLK) is zero
push hl
push de
ld hl, (FS_GETC)
ld hl, (FS_BLK)
ld de, 0
call cpHLDE
jr nz, .mounted

2
kernel/fs_cmds.asm
View File

@ -6,6 +6,8 @@ fsOnCmd:
; Lists filenames in currently active FS
flsCmd:
.db "fls", 0, 0, 0, 0
call fsIsOn
jr nz, .error
call fsBegin
jr nz, .error
.loop:

31
kernel/mmap.asm
View File

@ -5,29 +5,9 @@
; *** DEFINES ***
; MMAP_START: Memory address where the mmap begins
; *** VARIABLES ***
.equ MMAP_PTR MMAP_RAMSTART
.equ MMAP_RAMEND MMAP_PTR+2
; *** CODE ***
mmapInit:
xor a
ld (MMAP_PTR), a
ld (MMAP_PTR+1), a
ret
; Increase mem pointer by one
_mmapForward:
ld hl, (MMAP_PTR)
inc hl
ld (MMAP_PTR), hl
ret
; Returns absolute addr of memory pointer in HL.
_mmapAddr:
push de
ld hl, (MMAP_PTR)
ld de, MMAP_START
add hl, de
jr nc, .end
@ -43,7 +23,6 @@ mmapGetC:
push hl
call _mmapAddr
ld a, (hl)
call _mmapForward
cp a ; ensure Z
pop hl
ret
@ -52,16 +31,6 @@ mmapPutC:
push hl
call _mmapAddr
ld (hl), a
call _mmapForward
cp a ; ensure Z
pop hl
ret
mmapSeek:
ld (MMAP_PTR), hl
ret
mmapTell:
ld hl, (MMAP_PTR)
ret

60
kernel/sdc.asm
View File

@ -25,12 +25,9 @@
.equ SDC_BLKSIZE 512
; *** Variables ***
; Where the block dev current points to. This is a byte index. Higher 7 bits
; indicate a sector number, lower 9 bits are an offset in the current SDC_BUF.
.equ SDC_PTR SDC_RAMSTART
; Whenever we read a sector, we read a whole block at once and we store it
; in memory. That's where it goes.
.equ SDC_BUF SDC_PTR+2
.equ SDC_BUF SDC_RAMSTART
; Sector number currently in SDC_BUF. 0xff, it's initial value, means "no
; sector.
.equ SDC_BUFSEC SDC_BUF+SDC_BLKSIZE
@ -221,8 +218,6 @@ sdcInitialize:
jr nz, .error
; Success! out of idle mode!
; initialize variables
ld hl, 0
ld (SDC_PTR), hl
ld a, 0xff
ld (SDC_BUFSEC), a
xor a
@ -378,24 +373,24 @@ sdcWriteBlk:
pop bc
ret
; Ensures that (SDC_BUFSEC) is in sync with (SDC_PTR), that is, that the current
; buffer in memory corresponds to where SDC_PTR points to. If it doesn't, loads
; the sector that (SDC_PTR) points to in (SDC_BUF) and update (SDC_BUFSEC).
; Ensures that (SDC_BUFSEC) is in sync with HL, that is, that the current
; buffer in memory corresponds to where HL points to. If it doesn't, loads
; the sector that HL points to in (SDC_BUF) and update (SDC_BUFSEC).
; If the (SDC_BUFDIRTY) flag is set, we write the content of the in-memory
; buffer to the SD card before we read a new sector.
; Returns Z on success, not-Z on error (with the error code from either
; sdcReadBlk or sdcWriteBlk)
sdcSync:
; SDC_PTR points to the character we're supposed to read or right now,
; HL points to the character we're supposed to read or right now,
; but we first have to check whether we need to load a new sector in
; memory. To do this, we compare the high 7 bits of (SDC_PTR) with
; memory. To do this, we compare the high 7 bits of HL with
; (SDC_BUFSEC). If they're different, we need to load a new block.
push hl
ld a, (SDC_BUFSEC)
ld h, a
ld a, (SDC_PTR+1) ; high byte has bufsec in its high 7 bits
ld l, a
ld a, h
srl a
cp h
cp l
pop hl
ret z ; equal? nothing to do
; We have to read a new sector, but first, let's write the current one
@ -403,7 +398,7 @@ sdcSync:
call sdcWriteBlk
ret nz ; error
; Let's read our new sector
ld a, (SDC_PTR+1)
ld a, h
srl a
jp sdcReadBlk ; returns
@ -422,12 +417,15 @@ sdcFlushCmd:
; *** blkdev routines ***
; Make HL point to (SDC_PTR) in current buffer
; Make HL point to its proper place in SDC_BUF.
; HL currently is an offset to read in the SD card. Load the proper sector in
; memory and make HL point to the correct data in the memory buffer.
_sdcPlaceBuf:
call sdcSync
ret nz ; error
ld a, (SDC_PTR+1) ; high byte
ld a, h ; high byte
and 0x01 ; is first bit set?
ld a, l ; doesn't change flags
jr nz, .highbuf ; first bit set? we're in the "highbuf" zone.
; lowbuf zone
; Read byte from memory at proper offset in lowbuf (first 0x100 bytes)
@ -438,10 +436,9 @@ _sdcPlaceBuf:
ld hl, SDC_BUF+0x100
.read:
; HL is now placed either on the lower or higher half of SDC_BUF and
; all we need is to increase HL by the number in SDC_PTR's LSB (little
; endian, remember).
ld a, (SDC_PTR) ; LSB
call addHL ; returns
; all we need is to increase HL by the number in A which is the lower
; half of our former HL value.
call addHL
xor a ; ensure Z
ret
@ -452,12 +449,6 @@ sdcGetC:
; This is it!
ld a, (hl)
; before we return A, we need to increase (SDC_PTR)
ld hl, (SDC_PTR)
inc hl
ld (SDC_PTR), hl
cp a ; ensure Z
jr .end
.error:
@ -477,12 +468,6 @@ sdcPutC:
pop af
ld (hl), a
; we need to increase (SDC_PTR)
ld hl, (SDC_PTR)
inc hl
ld (SDC_PTR), hl
ld a, 1
ld (SDC_BUFDIRTY), a
xor a ; ensure Z
@ -493,12 +478,3 @@ sdcPutC:
.end:
pop hl
ret
sdcSeek:
ld (SDC_PTR), hl
ret
sdcTell:
ld hl, (SDC_PTR)
ret

20
recipes/rc2014/sdcard/glue.asm
View File

@ -29,10 +29,9 @@ jp aciaInt
.equ BLOCKDEV_COUNT 2
#include "blockdev.asm"
; List of devices
.dw sdcGetC, sdcPutC, sdcSeek, sdcTell
.dw blk2GetC, blk2PutC, blk2Seek, blk2Tell
.dw sdcGetC, sdcPutC
.dw blk2GetC, blk2PutC
#include "blockdev_cmds.asm"
.equ STDIO_RAMSTART BLOCKDEV_RAMEND
#include "stdio.asm"
@ -40,7 +39,6 @@ jp aciaInt
.equ FS_RAMSTART STDIO_RAMEND
.equ FS_HANDLE_COUNT 1
#include "fs.asm"
#include "fs_cmds.asm"
.equ SHELL_RAMSTART FS_RAMEND
.equ SHELL_EXTRA_CMD_COUNT 11
@ -49,9 +47,13 @@ jp aciaInt
.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
#include "blockdev_cmds.asm"
#include "fs_cmds.asm"
.equ PGM_RAMSTART SHELL_RAMEND
#include "pgm.asm"
.equ SDC_RAMSTART SHELL_RAMEND
.equ SDC_RAMSTART PGM_RAMEND
.equ SDC_PORT_CSHIGH 6
.equ SDC_PORT_CSLOW 5
.equ SDC_PORT_SPI 4
@ -87,11 +89,3 @@ blk2GetC:
blk2PutC:
ld ix, FS_HANDLES
jp fsPutC
blk2Seek:
ld ix, FS_HANDLES
jp fsSeek
blk2Tell:
ld ix, FS_HANDLES
jp fsTell

5
recipes/rc2014/zasm/cfsin/user.h
View File

@ -1,6 +1,7 @@
.equ USER_CODE 0x8600
.equ USER_RAMSTART USER_CODE+0x1800
.equ FS_HANDLE_SIZE 8
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
@ -24,3 +25,7 @@
.equ cpHLDE 0x3b
.equ parseArgs 0x3e
.equ printstr 0x41
.equ _blkGetC 0x44
.equ _blkPutC 0x47
.equ _blkSeek 0x4a
.equ _blkTell 0x4d

27
recipes/rc2014/zasm/glue.asm
View File

@ -37,6 +37,10 @@ jp aciaInt
jp cpHLDE
jp parseArgs
jp printstr
jp _blkGetC
jp _blkPutC
jp _blkSeek
jp _blkTell
#include "err.h"
#include "core.asm"
@ -47,23 +51,20 @@ jp aciaInt
.equ BLOCKDEV_COUNT 3
#include "blockdev.asm"
; List of devices
.dw sdcGetC, sdcPutC, sdcSeek, sdcTell
.dw mmapGetC, mmapPutC, mmapSeek, mmapTell
.dw blk2GetC, blk2PutC, blk2Seek, blk2Tell
.dw sdcGetC, sdcPutC
.dw mmapGetC, mmapPutC
.dw blk2GetC, blk2PutC
#include "blockdev_cmds.asm"
.equ MMAP_RAMSTART BLOCKDEV_RAMEND
.equ MMAP_START 0xe000
#include "mmap.asm"
.equ STDIO_RAMSTART MMAP_RAMEND
.equ STDIO_RAMSTART BLOCKDEV_RAMEND
#include "stdio.asm"
.equ FS_RAMSTART STDIO_RAMEND
.equ FS_HANDLE_COUNT 1
#include "fs.asm"
#include "fs_cmds.asm"
.equ SHELL_RAMSTART FS_RAMEND
.equ SHELL_EXTRA_CMD_COUNT 11
@ -72,6 +73,9 @@ jp aciaInt
.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
#include "fs_cmds.asm"
#include "blockdev_cmds.asm"
.equ PGM_RAMSTART SHELL_RAMEND
#include "pgm.asm"
@ -93,7 +97,6 @@ init:
ld hl, aciaGetC
ld de, aciaPutC
call stdioInit
call mmapInit
call shellInit
ld hl, pgmShellHook
ld (SHELL_CMDHOOK), hl
@ -114,11 +117,3 @@ blk2GetC:
blk2PutC:
ld ix, FS_HANDLES
jp fsPutC
blk2Seek:
ld ix, FS_HANDLES
jp fsSeek
blk2Tell:
ld ix, FS_HANDLES
jp fsTell

5
recipes/rc2014/zasm/user.h
View File

@ -1,6 +1,7 @@
.equ USER_CODE 0x8600
.equ USER_RAMSTART USER_CODE+0x1800
.equ FS_HANDLE_SIZE 8
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
@ -24,3 +25,7 @@
.equ cpHLDE 0x3b
.equ parseArgs 0x3e
.equ printstr 0x41
.equ _blkGetC 0x44
.equ _blkPutC 0x47
.equ _blkSeek 0x4a
.equ _blkTell 0x4d

64
tools/emul/shell/shell.c
View File

@ -19,10 +19,8 @@
* I/O Ports:
*
* 0 - stdin / stdout
* 1 - Filesystem blockdev data read/write. Reading and writing to it advances
* the pointer.
* 2 - Filesystem blockdev seek / tell. Low byte
* 3 - Filesystem blockdev seek / tell. High byte
* 1 - Filesystem blockdev data read/write. Reads and write data to the address
* previously selected through port 2
*/
//#define DEBUG
@ -32,15 +30,20 @@
#define RAMSTART 0x4000
#define STDIO_PORT 0x00
#define FS_DATA_PORT 0x01
#define FS_SEEKL_PORT 0x02
#define FS_SEEKH_PORT 0x03
#define FS_SEEKE_PORT 0x04
// Controls what address (24bit) the data port returns. To select an address,
// this port has to be written to 3 times, starting with the MSB.
// Reading this port returns an out-of-bounds indicator. 0 means addr is within
// bounds, non zero means either that we're in the middle of an addr-setting
// operation or that the address is not within bounds.
#define FS_ADDR_PORT 0x02
static Z80Context cpu;
static uint8_t mem[0xffff] = {0};
static uint8_t fsdev[MAX_FSDEV_SIZE] = {0};
static uint32_t fsdev_size = 0;
static uint32_t fsdev_ptr = 0;
// 0 = idle, 1 = received MSB (of 24bit addr), 2 = received middle addr
static int fsdev_addr_lvl = 0;
static int running;
static uint8_t io_read(int unused, uint16_t addr)
@ -53,11 +56,15 @@ static uint8_t io_read(int unused, uint16_t addr)
}
return c;
} else if (addr == FS_DATA_PORT) {
if (fsdev_addr_lvl != 0) {
fprintf(stderr, "Reading FSDEV in the middle of an addr op (%d)\n", fsdev_ptr);
return 0;
}
if (fsdev_ptr < fsdev_size) {
#ifdef DEBUG
fprintf(stderr, "Reading FSDEV at offset %d\n", fsdev_ptr);
#endif
return fsdev[fsdev_ptr++];
return fsdev[fsdev_ptr];
} else {
// don't warn when ==, we're not out of bounds, just at the edge.
if (fsdev_ptr > fsdev_size) {
@ -65,12 +72,14 @@ static uint8_t io_read(int unused, uint16_t addr)
}
return 0;
}
} else if (addr == FS_SEEKL_PORT) {
return fsdev_ptr & 0xff;
} else if (addr == FS_SEEKH_PORT) {
return (fsdev_ptr >> 8) & 0xff;
} else if (addr == FS_SEEKE_PORT) {
return (fsdev_ptr >> 16) & 0xff;
} else if (addr == FS_ADDR_PORT) {
if (fsdev_addr_lvl != 0) {
return fsdev_addr_lvl;
} else if (fsdev_ptr >= fsdev_size) {
return 1;
} else {
return 0;
}
} else {
fprintf(stderr, "Out of bounds I/O read: %d\n", addr);
return 0;
@ -87,23 +96,30 @@ static void io_write(int unused, uint16_t addr, uint8_t val)
putchar(val);
}
} else if (addr == FS_DATA_PORT) {
if (fsdev_addr_lvl != 0) {
fprintf(stderr, "Writing to FSDEV in the middle of an addr op (%d)\n", fsdev_ptr);
return;
}
if (fsdev_ptr < fsdev_size) {
fsdev[fsdev_ptr++] = val;
fsdev[fsdev_ptr] = val;
} else if ((fsdev_ptr == fsdev_size) && (fsdev_ptr < MAX_FSDEV_SIZE)) {
// We're at the end of fsdev, grow it
fsdev[fsdev_ptr++] = val;
fsdev[fsdev_ptr] = val;
fsdev_size++;
} else {
fprintf(stderr, "Out of bounds FSDEV write at %d\n", fsdev_ptr);
}
} else if (addr == FS_SEEKL_PORT) {
fsdev_ptr = (fsdev_ptr & 0xffff00) | val;
} else if (addr == FS_SEEKH_PORT) {
fsdev_ptr = (fsdev_ptr & 0xff00ff) | (val << 8);
} else if (addr == FS_SEEKE_PORT) {
fsdev_ptr = (fsdev_ptr & 0x00ffff) | (val << 16);
} else {
fprintf(stderr, "Out of bounds I/O write: %d / %d (0x%x)\n", addr, val, val);
} else if (addr == FS_ADDR_PORT) {
if (fsdev_addr_lvl == 0) {
fsdev_ptr = val << 16;
fsdev_addr_lvl = 1;
} else if (fsdev_addr_lvl == 1) {
fsdev_ptr |= val << 8;
fsdev_addr_lvl = 2;
} else {
fsdev_ptr |= val;
fsdev_addr_lvl = 0;
}
}
}

79
tools/emul/shell/shell_.asm
View File

@ -6,9 +6,7 @@
.equ USERCODE KERNEL_RAMEND
.equ STDIO_PORT 0x00
.equ FS_DATA_PORT 0x01
.equ FS_SEEKL_PORT 0x02
.equ FS_SEEKH_PORT 0x03
.equ FS_SEEKE_PORT 0x04
.equ FS_ADDR_PORT 0x02
jp init
@ -33,6 +31,10 @@
jp cpHLDE
jp parseArgs
jp printstr
jp _blkGetC
jp _blkPutC
jp _blkSeek
jp _blkTell
#include "core.asm"
#include "err.h"
@ -42,17 +44,16 @@
.equ BLOCKDEV_COUNT 4
#include "blockdev.asm"
; List of devices
.dw fsdevGetC, fsdevPutC, fsdevSeek, fsdevTell
.dw stdoutGetC, stdoutPutC, stdoutSeek, stdoutTell
.dw stdinGetC, stdinPutC, stdinSeek, stdinTell
.dw mmapGetC, mmapPutC, mmapSeek, mmapTell
.dw fsdevGetC, fsdevPutC
.dw stdoutGetC, stdoutPutC
.dw stdinGetC, stdinPutC
.dw mmapGetC, mmapPutC
.equ MMAP_RAMSTART BLOCKDEV_RAMEND
.equ MMAP_START 0xe000
#include "mmap.asm"
.equ STDIO_RAMSTART MMAP_RAMEND
.equ STDIO_RAMSTART BLOCKDEV_RAMEND
#include "stdio.asm"
.equ FS_RAMSTART STDIO_RAMEND
@ -82,7 +83,6 @@ init:
ld hl, emulGetC
ld de, emulPutC
call stdioInit
call mmapInit
call fsInit
ld a, 0 ; select fsdev
ld de, BLOCKDEV_SEL
@ -104,35 +104,36 @@ emulPutC:
ret
fsdevGetC:
ld a, e
out (FS_ADDR_PORT), a
ld a, h
out (FS_ADDR_PORT), a
ld a, l
out (FS_ADDR_PORT), a
in a, (FS_ADDR_PORT)
or a
ret nz
in a, (FS_DATA_PORT)
cp a ; ensure Z
ret
fsdevPutC:
push af
ld a, e
out (FS_ADDR_PORT), a
ld a, h
out (FS_ADDR_PORT), a
ld a, l
out (FS_ADDR_PORT), a
in a, (FS_ADDR_PORT)
or a
jr nz, .error
pop af
out (FS_DATA_PORT), a
ret
fsdevSeek:
push af
ld a, l
out (FS_SEEKL_PORT), a
ld a, h
out (FS_SEEKH_PORT), a
ld a, e
out (FS_SEEKE_PORT), a
.error:
pop af
ret
fsdevTell:
push af
in a, (FS_SEEKL_PORT)
ld l, a
in a, (FS_SEEKH_PORT)
ld h, a
in a, (FS_SEEKE_PORT)
ld e, a
pop af
ret
jp unsetZ ; returns
.equ STDOUT_HANDLE FS_HANDLES
@ -144,14 +145,6 @@ stdoutPutC:
ld ix, STDOUT_HANDLE
jp fsPutC
stdoutSeek:
ld ix, STDOUT_HANDLE
jp fsSeek
stdoutTell:
ld ix, STDOUT_HANDLE
jp fsTell
.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
stdinGetC:
@ -162,11 +155,3 @@ stdinPutC:
ld ix, STDIN_HANDLE
jp fsPutC
stdinSeek:
ld ix, STDIN_HANDLE
jp fsSeek
stdinTell:
ld ix, STDIN_HANDLE
jp fsTell

5
tools/emul/shell/user.h
View File

@ -1,6 +1,7 @@
.equ USER_CODE 0x4200
.equ USER_RAMSTART USER_CODE+0x1800
.equ FS_HANDLE_SIZE 8
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
@ -23,3 +24,7 @@
.equ cpHLDE 0x36
.equ parseArgs 0x39
.equ printstr 0x3c
.equ _blkGetC 0x3f
.equ _blkPutC 0x42
.equ _blkSeek 0x45
.equ _blkTell 0x48

62
tools/emul/zasm/glue.asm
View File

@ -28,6 +28,10 @@ jp fsSeek
jp fsTell
jp cpHLDE
jp parseArgs
jp _blkGetC
jp _blkPutC
jp _blkSeek
jp _blkTell
#include "core.asm"
#include "err.h"
@ -36,9 +40,9 @@ jp parseArgs
.equ BLOCKDEV_COUNT 3
#include "blockdev.asm"
; List of devices
.dw emulGetC, 0, emulSeek, emulTell
.dw 0, emulPutC, 0, 0
.dw fsdevGetC, fsdevPutC, fsdevSeek, fsdevTell
.dw emulGetC, unsetZ
.dw unsetZ, emulPutC
.dw fsdevGetC, fsdevPutC
.equ FS_RAMSTART BLOCKDEV_RAMEND
.equ FS_HANDLE_COUNT 0
@ -62,6 +66,12 @@ init:
; *** I/O ***
emulGetC:
; the STDIN_SEEK port works by poking it twice. First poke is for high
; byte, second poke is for low one.
ld a, h
out (STDIN_SEEK), a
ld a, l
out (STDIN_SEEK), a
in a, (STDIO_PORT)
or a ; cp 0
jr z, .eof
@ -75,33 +85,21 @@ emulPutC:
out (STDIO_PORT), a
ret
emulSeek:
; the STDIN_SEEK port works by poking it twice. First poke is for high
; byte, second poke is for low one.
ld a, h
out (STDIN_SEEK), a
ld a, l
out (STDIN_SEEK), a
ret
emulTell:
; same principle as STDIN_SEEK
in a, (STDIN_SEEK)
ld h, a
in a, (STDIN_SEEK)
ld l, a
ret
fsdevGetC:
ld a, e
out (FS_SEEK_PORT), a
ld a, h
out (FS_SEEK_PORT), a
ld a, l
out (FS_SEEK_PORT), a
in a, (FS_SEEK_PORT)
or a
ret nz
in a, (FS_DATA_PORT)
cp a ; ensure Z
ret
fsdevPutC:
out (FS_DATA_PORT), a
ret
fsdevSeek:
push af
ld a, e
out (FS_SEEK_PORT), a
@ -109,17 +107,13 @@ fsdevSeek:
out (FS_SEEK_PORT), a
ld a, l
out (FS_SEEK_PORT), a
in a, (FS_SEEK_PORT)
or a
jr nz, .error
pop af
out (FS_DATA_PORT), a
ret
fsdevTell:
push af
in a, (FS_SEEK_PORT)
ld e, a
in a, (FS_SEEK_PORT)
ld h, a
in a, (FS_SEEK_PORT)
ld l, a
.error:
pop af
ret
jp unsetZ ; returns

5
tools/emul/zasm/user.h
View File

@ -1,6 +1,7 @@
.equ USER_CODE 0x4800
.equ USER_RAMSTART 0x6000
.equ FS_HANDLE_SIZE 8
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
@ -22,3 +23,7 @@
.equ fsTell 0x33
.equ cpHLDE 0x36
.equ parseArgs 0x39
.equ _blkGetC 0x3c
.equ _blkPutC 0x3f
.equ _blkSeek 0x42
.equ _blkTell 0x45

16
tools/emul/zasm/zasm.c
View File

@ -81,18 +81,12 @@ static uint8_t io_read(int unused, uint16_t addr)
return 0;
}
} else if (addr == FS_SEEK_PORT) {
if (fsdev_seek_tell_cnt == 0) {
#ifdef DEBUG
fprintf(stderr, "FS tell %d\n", fsdev_ptr);
#endif
fsdev_seek_tell_cnt = 1;
return fsdev_ptr >> 16;
} else if (fsdev_seek_tell_cnt == 1) {
fsdev_seek_tell_cnt = 2;
return (fsdev_ptr >> 8) & 0xff;
if (fsdev_seek_tell_cnt != 0) {
return fsdev_seek_tell_cnt;
} else if (fsdev_ptr >= fsdev_size) {
return 1;
} else {
fsdev_seek_tell_cnt = 0;
return fsdev_ptr & 0xff;
return 0;
}
} else {
fprintf(stderr, "Out of bounds I/O read: %d\n", addr);

22
tools/tests/unit/test_core.asm
View File

@ -8,6 +8,28 @@ test:
ld hl, 0xffff
ld sp, hl
; *** Just little z80 flags memo.
and a ; clear carry
ld hl, 100
ld de, 101
sbc hl, de
jp nc, fail ; carry is set
call nexttest
and a ; clear carry
ld hl, 101
ld de, 100
sbc hl, de
jp c, fail ; carry is reset
call nexttest
ld a, 1
dec a
jp m, fail ; positive
dec a
jp p, fail ; negative
call nexttest
; *** subHL ***
ld hl, 0x123
ld a, 0x25

48
tools/tests/zasm/errtests.sh
View File

@ -26,34 +26,34 @@ chkoom() {
done
${ZASM} <<< "$s" > /dev/null
local res=$?
if [[ $res == 7 ]]; then
if [[ $res == 23 ]]; then
echo "Good!"
else
echo "$res != 7"
echo "$res != 23"
exit 1
fi
}
chkerr "foo" 1
chkerr "ld a, foo" 2
chkerr "ld a, hl" 2
chkerr ".db foo" 2
chkerr ".dw foo" 2
chkerr ".equ foo bar" 2
chkerr ".org foo" 2
chkerr ".fill foo" 2
chkerr "ld a," 3
chkerr "ld a, 'A" 3
chkerr ".db 0x42," 3
chkerr ".dw 0x4242," 3
chkerr ".equ" 3
chkerr ".equ foo" 3
chkerr ".org" 3
chkerr ".fill" 3
chkerr "#inc" 3
chkerr "#inc foo" 3
chkerr "ld a, 0x100" 4
chkerr ".db 0x100" 4
chkerr "#inc \"doesnotexist\"" 5
chkerr ".equ foo 42 \\ .equ foo 42" 6
chkerr "foo" 17
chkerr "ld a, foo" 18
chkerr "ld a, hl" 18
chkerr ".db foo" 18
chkerr ".dw foo" 18
chkerr ".equ foo bar" 18
chkerr ".org foo" 18
chkerr ".fill foo" 18
chkerr "ld a," 19
chkerr "ld a, 'A" 19
chkerr ".db 0x42," 19
chkerr ".dw 0x4242," 19
chkerr ".equ" 19
chkerr ".equ foo" 19
chkerr ".org" 19
chkerr ".fill" 19
chkerr "#inc" 19
chkerr "#inc foo" 19
chkerr "ld a, 0x100" 20
chkerr ".db 0x100" 20
chkerr "#inc \"doesnotexist\"" 21
chkerr ".equ foo 42 \\ .equ foo 42" 22
chkoom

5
tools/tests/zasm/test7.asm
View File

@ -1,6 +1,7 @@
.equ USER_CODE 0x4800
.equ USER_RAMSTART 0x5800
.equ FS_HANDLE_SIZE 8
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
@ -22,6 +23,10 @@
.equ fsTell 0x33
.equ cpHLDE 0x36
.equ parseArgs 0x39
.equ _blkGetC 0x3c
.equ _blkPutC 0x3f
.equ _blkSeek 0x42
.equ _blkTell 0x45
#include "err.h"
#include "zasm/const.asm"