CPM3 Loader Using New HBIOS SLICE Function

Source/CPM3/biosldr.z80

@@ -9,6 +9,8 @@
 	extrn	cin, cout
 	extrn	crlf, crlf2
 
+        include	hbios.z80
+
 	debug	equ	false
 
 ; BIOS Jump vector.
@@ -78,6 +80,10 @@ boot0:
 	  if cmdline
 
 boot1:
+	;
+	; The following Code is the Entry Point for the Loader when
+	; it is built as a COM file. Typically CPMLDR.COM or ZPMLDR.COM
+	;
 	; Get disk unit from user
 	ld	de,msgunit		; disk unit prompt
 	call	writestr		; display on console
@@ -88,7 +94,7 @@ boot1:
 	sub	'0'			; convert to binary
 	ld	(unit),a		; save it
 	jr	c,selerr		; loop if below 0 entered
-	ld	bc,0F810h		; HBIOS, get disk unit count
+	ld	bc,BC_SYSGET_DIOCNT	; HBIOS, get disk unit count
 	call	0FFF0h			; do it, E := disk unit count
 	ld	a,(unit)		; get unit num back
 	cp	e			; compare to entry
@@ -118,7 +124,7 @@ selerr:
 
 boot2:
 	; Record unit & slice w/ HBIOS
-	ld	bc,0F9E0h		; HBIOS func: set boot info
+	ld	bc,BC_SYSSET_BOOTINFO	; HBIOS func: set boot info
 	ld	a,(unit)		; get unit
 	ld	d,a			; put in D
 	ld	a,(slice)		; get slice
@@ -128,8 +134,13 @@ boot2:
 
 	  else
 
+	;
+	; The following Code is the Entry Point for the Loader when
+	; it is built as a SYS file, and run from the System Track
+	;
+
 	; Get unit & slice from HBIOS
-	ld	bc,0F8E0h		; HBIOS func: get boot info
+	ld	bc,BC_SYSGET_BOOTINFO	; HBIOS func: get boot info
 	call	0FFF0h			; do it, D := boot unit, E: := slice
 	ld	a,d			; move unit to A
 	ld	(unit),a		; save it
@@ -138,103 +149,27 @@ boot2:
 
 	  endif
 
-	; Check that drive actually exists
-	ld	bc,0F810h		; HBIOS func: get disk count
-	call	0FFF0h			; do it, E=disk count
-	ld	a,(unit)		; get boot disk unit
-	cp	e			; compare to count
-	jp	nc,err_nodisk		; handle no disk err
-
 	; Sense media to determine media format
 	ld	a,(unit)		; Get boot unit
-	ld	c,a			; put in C
-	ld	b,18h			; HBIOS Media function
-	ld	e,1			; Enable media check/discovery
+	ld	d,a			; put in D
+	ld	a,(slice)		; get boot slice
+	ld	e,a			; put in E
+	ld	b,BF_EXTSLICE		; HBIOS FUNC: SLICE
 	call	0FFF0H			; HBIOS call
-	jp	nz,err_diskio		; handle error
-	ld	a,e			; resultant media id to accum
-	ld	(medid),a		; save media id
-	or	a			; set flags, 0 is no media
-	jp	z,err_diskio		; handle no media error
-
-	; Initialize slice start LBA & sectors per slice
-	ld	hl,0			; assume slice starts
-	ld	(lba),hl		; ... at LBA offset
-	ld	(lba+2),hl		; ... of zero
-	ld	hl,16640		; assume legacy value for
-	ld	(sps),hl		; ... sectors per slice
 
-	; If not hard disk, skip partition & slice stuff
-	ld	a,(medid)		; get media id
-	cp	4			; hard disk?
-	jr	nz,boot9		; if not, jump ahead
-
-	; Read MBR
-	ld	de,8000h		; LBA address zero
-	ld	hl,0			; ... to read first sector
-	ld	bc,mbrsec		; read into MBR buffer
-	ld	(dma),bc		; save
-	ld	b,1			; one sector
-	ld	a,(unit)		; get bootunit
-	ld	c,a			; put in C
-	call	diskread		; do it, no return on err
-
-	; Check signature
-	ld	hl,(mbrsec+1FEh)	; get signature
-	ld	a,l			; first byte
-	cp	055h			; should be $55
-	jr	nz,boot5		; if not, no part table
-	ld	a,h			; second byte
-	cp	0AAh			; should be $AA
-	jr	nz,boot5		; if not, no part table
-
-	; Search part table for CP/M entry (type 0x2E)
-	ld	b,4			; four entries in part table
-	ld	hl,mbrsec+1BEh+4	; offset of first part type
-boot3:
-	ld	a,(hl)			; get part type
-	cp	2Eh			; CP/M partition?
-	jr	z,boot4			; cool, grab the LBA offset
-	ld	de,16			; part table entry size
-	add	hl,de			; bump to next part type
-	djnz	boot3			; loop thru table
-	jr	boot5			; too bad, no CP/M partition
-
-boot4:
-	; Capture the starting LBA of the CP/M partition we found
-	ld	de,4			; LBA is 4 bytes after part type
-	add	hl,de			; point to it
-	ld	de,lba			; loc to store lba offset
-	ld	bc,4			; 4 bytes (32 bits)
-	ldir				; copy it
-
-	; For now, it is implied that a slice within a partition
-	; table will be in the "new" disk format.  So, we now
-	; adjust the sectors per slice and media id.
-
-	; Use new slice format sectors per slice value
-	ld	hl,16384		; new sectors per slice
-	ld	(sps),hl		; save it
-
-	; Update media id for new hard disk format
-	ld	a,10			; new media id
-	ld	(medid),a		; save it
-
-boot5:
-	; Adjust LBA offset based on target slice
-	ld	a,(slice)		; get boot slice, A is loop cnt
-	ld	hl,(lba)		; set DE:HL
-	ld	de,(lba+2)		; ... to starting LBA
-	ld	bc,(sps)		; sectors per slice
-boot6:
-	or	a			; set flags to check loop cntr
-	jr	z,boot8			; done if counter exhausted
-	add	hl,bc			; add one slice to low word
-	jr	nc,boot7		; check for carry
-	inc	de			; if so, bump high word
-boot7:
-	dec	a			; dec loop downcounter
-	jr	boot6			; and loop
+	; Check errors from the Function
+	cp	ERR_NOUNIT		; compare to no unit error
+	jp	z,err_nodisk		; handle no disk err
+	cp	ERR_NOMEDIA		; no media in the device
+	jp	z,err_nodisk		; handle the error
+	cp	ERR_RANGE		; slice is invalid
+	jp	z,err_noslice		; bad slice, handle err
+	or	a			; any other error
+	jp	nz,err_diskio		; handle as general IO error
+
+	; Initialize slice start LBA and Media ID
+	ld	a,c
+	ld	(medid),a		; save media id
 boot8:
 	ld	(lba),hl		; save new lba, low word
 	ld	(lba+2),de		; save new lba, high word
@@ -343,7 +278,7 @@ read:
 	; Check device type
 	ld	a,(unit)		; get unit
 	ld	c,a			; BIOS Disk Unit in C
-	ld	b,17h			; HBIOS DEVICE function
+	ld	b,BF_DIODEVICE		; HBIOS DEVICE function
 	rst	08			; Do it, D=device type
 	ld	a,d			; put in accum
 	cp	01h			; floppy?
@@ -401,14 +336,14 @@ diskread:
 
 	; Seek to requested sector in DE:HL
 	push	bc			; save unit & count
-	ld	b,012h			; HBIOS func: seek
+	ld	b,BF_DIOSEEK		; HBIOS func: seek
 	call	0FFF0h			; do it
 	pop	bc			; recover unit & count
 	jp	nz,err_diskio		; handle error
 
 	; Read sector(s) into buffer
 	ld	e,b			; transfer count
-	ld	b,013h			; HBIOS func: disk read
+	ld	b,BF_DIOREAD		; HBIOS func: disk read
 	ld	hl,(dma)		; read into info sec buffer
 	ld	a,(0FFE0h)		; get current bank
 	ld	d,a			; put in D
@@ -477,7 +412,7 @@ xmove:
 ;cin:
 ;	; Input character from console via HBIOS
 ;	ld	c,080H			; console unit to C
-;	ld	b,00H			; HBIOS func: input char
+;	ld	b,BF_CIOIN		; HBIOS func: input char
 ;	call	0FFF0H			; HBIOS reads character
 ;	ld	a,e			; To A for return
 ;	ret				; done
@@ -486,7 +421,7 @@ xmove:
 ;	; Output character to console via HBIOS
 ;	ld	e,a			; output char to E
 ;	ld	c,080H			; console unit to C
-;	ld	b,01H			; HBIOS func: output char
+;	ld	b,BF_CIOOUT		; HBIOS func: output char
 ;	jp	0FFF0H			; output & return
 
 writestr:
@@ -539,7 +474,7 @@ err:
 
 str_err_prefix	db	"\r\n\r\n*** ","$"
 str_err_nodisk	db	"Disk unit not available","$"
-str_err_noslice	db	"Disk unit does not support slices","$"
+str_err_noslice	db	"Slice not supported","$"
 str_err_diskio	db	"Disk I/O failure","$"
 str_err_sig	db	"No system image on disk","$"
 str_err_api	db	"HBIOS API failure","$"
@@ -728,7 +663,6 @@ dma	ds	2	; current DMA address
 
 medid	ds	1	; media id
 lba	ds	4	; current lba
-sps	ds	2	; sectors per slice
 
 	ds	64
 stack	equ	$

Source/CPM3/hbios.z80

@@ -0,0 +1,90 @@
+
+;
+BF_CIO		EQU	000h
+BF_CIOIN	EQU	BF_CIO + 0	; CHARACTER INPUT
+BF_CIOOUT	EQU	BF_CIO + 1	; CHARACTER OUTPUT
+BF_CIOIST	EQU	BF_CIO + 2	; CHARACTER INPUT STATUS
+BF_CIOOST	EQU	BF_CIO + 3	; CHARACTER OUTPUT STATUS
+BF_CIOINIT	EQU	BF_CIO + 4	; INIT/RESET DEVICE/LINE CONFIG
+BF_CIOQUERY	EQU	BF_CIO + 5	; REPORT DEVICE/LINE CONFIG
+BF_CIODEVICE	EQU	BF_CIO + 6	; REPORT DEVICE INFO
+;
+;
+BF_DIO		EQU	010h
+BF_DIOSTATUS	EQU	BF_DIO + 0	; DISK STATUS
+BF_DIORESET	EQU	BF_DIO + 1	; DISK RESET
+BF_DIOSEEK	EQU	BF_DIO + 2	; DISK SEEK
+BF_DIOREAD	EQU	BF_DIO + 3	; DISK READ SECTORS
+BF_DIOWRITE	EQU	BF_DIO + 4	; DISK WRITE SECTORS
+BF_DIOVERIFY	EQU	BF_DIO + 5	; DISK VERIFY SECTORS
+BF_DIOFORMAT	EQU	BF_DIO + 6	; DISK FORMAT TRACK
+BF_DIODEVICE	EQU	BF_DIO + 7	; DISK DEVICE INFO REPORT
+BF_DIOMEDIA	EQU	BF_DIO + 8	; DISK MEDIA REPORT
+BF_DIODEFMED	EQU	BF_DIO + 9	; DEFINE DISK MEDIA
+BF_DIOCAP	EQU	BF_DIO + 10	; DISK CAPACITY REPORT
+BF_DIOGEOM	EQU	BF_DIO + 11	; DISK GEOMETRY REPORT
+;
+BF_EXT		EQU	0E0h
+BF_EXTSLICE	EQU	BF_EXT + 0	; SLICE CALCULATION (WAS BF_SYSGET_DIOMED)
+;
+BF_SYS		EQU	0F0h
+BF_SYSRESET	EQU	BF_SYS + 0	; SOFT RESET HBIOS
+BF_SYSVER	EQU	BF_SYS + 1	; GET HBIOS VERSION
+BF_SYSSETBNK	EQU	BF_SYS + 2	; SET CURRENT BANK
+BF_SYSGETBNK	EQU	BF_SYS + 3	; GET CURRENT BANK
+BF_SYSSETCPY	EQU	BF_SYS + 4	; BANK MEMORY COPY SETUP
+BF_SYSBNKCPY	EQU	BF_SYS + 5	; BANK MEMORY COPY
+BF_SYSALLOC	EQU	BF_SYS + 6	; ALLOC HBIOS HEAP MEMORY
+BF_SYSFREE	EQU	BF_SYS + 7	; FREE HBIOS HEAP MEMORY
+BF_SYSGET	EQU	BF_SYS + 8	; GET HBIOS INFO
+BF_SYSSET	EQU	BF_SYS + 9	; SET HBIOS PARAMETERS
+BF_SYSPEEK	EQU	BF_SYS + 10	; GET A BYTE VALUE FROM ALT BANK
+BF_SYSPOKE	EQU	BF_SYS + 11	; SET A BYTE VALUE IN ALT BANK
+BF_SYSINT	EQU	BF_SYS + 12	; MANAGE INTERRUPT VECTORS
+;
+; 2 BYTE FUNCTION/SUBFUNCTION : BC_ => BIOS CALL -> LOAD TO BC REGISTER
+;
+BC_SYSGET_CIOCNT	EQU	0F800h	; GET CHAR UNIT COUNT
+BC_SYSGET_CIOFN		EQU	0F801h	; GET CIO UNIT FN/DATA ADR
+BC_SYSGET_DIOCNT	EQU	0F810h	; GET DISK UNIT COUNT
+BC_SYSGET_DIOFN		EQU	0F811h	; GET DIO UNIT FN/DATA ADR
+BC_SYSGET_RTCCNT	EQU	0F820h	; GET RTC UNIT COUNT
+BC_SYSGET_DSKYCNT	EQU	0F830h	; GET DSKY UNIT COUNT
+BC_SYSGET_VDACNT	EQU	0F840h	; GET VDA UNIT COUNT
+BC_SYSGET_VDAFN		EQU	0F841h	; GET VDA UNIT FN/DATA ADR
+BC_SYSGET_SNDCNT	EQU	0F850h	; GET VDA UNIT COUNT
+BC_SYSGET_SNDFN		EQU	0F851h	; GET SND UNIT FN/DATA ADR
+BC_SYSGET_TIMER		EQU	0F8D0h	; GET CURRENT TIMER VALUE
+BC_SYSGET_SECS		EQU	0F8D1h	; GET CURRENT SECONDS VALUE
+BC_SYSGET_BOOTINFO	EQU	0F8E0h	; GET BOOT INFORMATION
+BC_SYSGET_CPUINFO	EQU	0F8F0h	; GET CPU INFORMATION
+BC_SYSGET_MEMINFO	EQU	0F8F1h	; GET MEMORY CAPACTITY INFO
+BC_SYSGET_BNKINFO	EQU	0F8F2h	; GET BANK ASSIGNMENT INFO
+BC_SYSGET_CPUSPD	EQU	0F8F3h	; GET CLOCK SPEED & WAIT STATES
+BC_SYSGET_PANEL		EQU	0F8F4h	; GET FRONT PANEL SWITCHES VAL
+BC_SYSGET_APPBNKS	EQU	0F8F5h	; GET APP BANK INFORMATION
+;
+BC_SYSSET_TIMER		EQU	0F9D0h	; SET TIMER VALUE
+BC_SYSSET_SECS		EQU	0F9D1h	; SET SECONDS VALUE
+BC_SYSSET_BOOTINFO	EQU	0F9E0h	; SET BOOT INFORMATION
+BC_SYSSET_CPUSPD	EQU	0F9F3h	; SET CLOCK SPEED & WAIT STATES
+BC_SYSSET_PANEL		EQU	0F9F4h	; SET FRONT PANEL LEDS
+;
+;
+;
+ERR_NONE	EQU	0		; SUCCESS
+;
+ERR_UNDEF	EQU	-1		; UNDEFINED ERROR
+ERR_NOTIMPL	EQU	-2		; FUNCTION NOT IMPLEMENTED
+ERR_NOFUNC	EQU	-3		; INVALID FUNCTION
+ERR_NOUNIT	EQU	-4		; INVALID UNIT NUMBER
+ERR_NOMEM	EQU	-5		; OUT OF MEMORY
+ERR_RANGE	EQU	-6		; PARAMETER OUT OF RANGE
+ERR_NOMEDIA	EQU	-7		; MEDIA NOT PRESENT
+ERR_NOHW	EQU	-8		; HARDWARE NOT PRESENT
+ERR_IO		EQU	-9		; I/O ERROR
+ERR_READONLY	EQU	-10		; WRITE REQUEST TO READ-ONLY MEDIA
+ERR_TIMEOUT	EQU	-11		; DEVICE TIMEOUT
+ERR_BADCFG	EQU	-12		; INVALID CONFIGURATION
+ERR_INTERNAL	EQU	-13		; INTERNAL ERROR
+