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1 line
1.9 KiB
Plaintext
1 line
1.9 KiB
Plaintext
;************ biosio.z8k **************************
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;*
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;* I/O routines for CP/M-8000(tm) BIOS
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;* for Olivetti M20 (Z8001) system.
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;*
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;* 821013 S. Savitzky (Zilog) -- created.
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;*
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__text: .sect
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;****************************************************
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;*
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;* NOTE The Olivetti PROM routines are segmented.
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;* The C portion of the BIOS is non-segmented.
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;*
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;* This assembly-language module is assembled
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;* non-segmented, and serves as the interface.
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;*
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;* Segmented operations are well-isolated, and
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;* are either the same as their non-segmented
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;* counterparts, or constructed using macros.
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;*
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;****************************************************
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;.input "biosdefs.8kn"
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;****************************************************
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;*
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;* Global declarations
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;*
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;****************************************************
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.global _disk_io
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.global _crt_put
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.global _cold_boot
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;****************************************************
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;*
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;* Prom Subroutine Access
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;*
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;****************************************************
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_disk_io: ;err=disk_io(drv, cmd, count, blk, addr)
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dec r15,#14 ;save registers
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ldm @r15,r8,#7
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ldb rh7,14+ARG1+1(r15) ;get args
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ldb rl7,14+ARG2+1(r15)
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ld r8, 14+ARG3(r15)
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ld r9, 14+ARG4(r15)
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ldl rr10,14+ARG5(r15)
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;rh7 = drive #
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;rl7 = command
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;r8 = block count
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;r9 = block number
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;rr10 = segmented address
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SEG
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scall 84000068h
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NONSEG
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;r8 = block count not transferred
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;rh7 = #retries
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;rl7 = final error code (RETURNED)
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;rh6 = error retried
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and r7,#0FFh ;value returned in r7
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ldm r8,@r15,#7 ;restore regs
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inc r15,#14
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ret
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_crt_put: ;crt_put(char)
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dec r15,#14 ;save registers
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ldm @r15,r8,#7
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ld r1,14+ARG1(r15) ;get arg in r1
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SEG ; SEG clobbers r0
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ld r0,r1 ;rl0 = char
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scall 84000080h
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NONSEG
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ldm r8,@r15,#7 ;restore regs
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inc r15,#14
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ret
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_cold_boot:
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SEG
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scall 8400008Ch
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NONSEG
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ret
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ld_boot:
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SEG
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scall 8400008Ch
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NONSEG
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ret
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