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156 lines
2.5 KiB
Plaintext
156 lines
2.5 KiB
Plaintext
;************ syscall.z8s **************************
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;*
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;* System Call interface for P-CP/M (tm) BIOS
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;*
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;* 820927 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
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;* The following system call interface routines
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;* are designed to be called from non-segmented
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;* C programs.
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;*
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;* Addresses are passed as LONGs.
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;*
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;****************************************************
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.input "biosdefs.z8k"
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.global _xfer
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.global _mem_cpy
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.global _map_adr
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.global _bios
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.global _bdos
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;****************************************************
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;*
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;* Context Switch Routine
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;*
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;* xfer(context)
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;* long context;
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;*
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;* context is the physical (long) address of:
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;* r0
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;* ...
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;* r13
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;* r14 (normal r14)
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;* r15 (normal r15)
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;* ignored word
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;* FCW (had better specify normal mode)
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;* PC segment
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;* PC offset
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;*
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;* The system stack pointer is not affected.
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;*
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;* Control never returns to the caller.
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;*
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;****************************************************
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_xfer:
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ldl rr6,ARG1(r15)
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ldl rr4,#-2
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subl rr2,rr2
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sc #XFER_SC
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ret
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;****************************************************
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;*
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;* System/User Memory Access
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;*
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;* _mem_cpy( source, dest, length)
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;* long source, dest, length;
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;* _map_adr( addr, space) -> paddr
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;* long addr; int space;
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;*
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;* _map_adr( addr, -1)
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;* sets user segment # from addr.
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;*
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;* _map_adr( addr, -2)
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;* transfer to context block at addr
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;*
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;* system call: mem_cpy
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;* rr6: source
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;* rr4: dest
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;* rr2: length (0 < length <= 64K)
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;* returns
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;* registers unchanged
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;*
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;* system call: map_adr
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;* rr6: logical addr
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;* r5: space code
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;* r4: ignored
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;* rr2: 0
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;* returns
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;* rr6: physical addr
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;*
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;* space codes:
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;* 0: caller data
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;* 1: caller program
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;* 2: system data
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;* 3: system program
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;* 4: TPA data
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;* 5: TPA program
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;*
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;* x+256 return segmented instruction address,
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;* not data access address
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;*
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;* FFFF set user-space segment from address
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;*
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;****************************************************
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_mem_cpy: ;copy memory C subroutine
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;===
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ldl rr6,ARG1(r15)
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ldl rr4,ARG3(r15)
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ldl rr2,ARG5(r15)
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sc #MEM_SC
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ret
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_map_adr: ;map address C subroutine
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;===
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ldl rr6,ARG1(r15)
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ld r5, ARG3(r15)
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subl rr2,rr2 ; 0 length says map
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sc #MEM_SC
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ret
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;****************************************************
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;*
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;* long _bios(code, p1, p2)
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;* long _bdos(code, p1)
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;* int code;
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;* long p1, p2;
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;*
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;* BIOS, BDOS access
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;*
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;****************************************************
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_bios:
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ld r3,ARG1(r15)
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ldl rr4,ARG2(r15)
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ldl rr6,ARG4(r15)
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sc #BIOS_SC
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ret
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_bdos:
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ld r5,ARG1(r15)
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ldl rr6,ARG2(r15)
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sc #BDOS_SC
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ret
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