98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
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/*
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DYNINIT.C
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this serves requests from the INIT modules to
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allocate dynamic data.
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kernel layout:
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00000H 000FFH 00100H PSP PSP
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00100H 004E1H 003E2H _TEXT CODE
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004E2H 007A7H 002C6H _IO_TEXT CODE
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007A8H 008E5H 0013EH _IO_FIXED_DATA CODE
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008F0H 0139FH 00AB0H _FIXED_DATA DATA
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013A0H 019F3H 00654H _DATA DATA
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019F4H 0240DH 00A1AH _BSS BSS
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additionally:
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DYN_DATA DYN
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02610H 0F40EH 0CDFFH HMA_TEXT HMA
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FCBs, f_nodes, buffers,...
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drivers
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0F410H 122DFH 02ED0H INIT_TEXT INIT
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122E0H 12AA5H 007C6H ID ID
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12AA6H 12CBFH 0021AH IB IB
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purpose is to move the HMA_TEXT = resident kernel
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around, so that below it - after BSS, there is data
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addressable near by the kernel, to hold some arrays
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like f_nodes
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making f_nodes near saves ~2.150 code in HMA
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*/
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#include "portab.h"
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#include "init-mod.h"
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#include "dyndata.h"
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#if defined(DEBUG)
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#define DebugPrintf(x) printf x
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#else
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#define DebugPrintf(x)
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#endif
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/*extern struct DynS FAR Dyn;*/
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#ifndef __TURBOC__
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extern struct DynS DOSFAR ASM Dyn;
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#else
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extern struct DynS FAR ASM Dyn;
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#endif
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void far *DynAlloc(char *what, unsigned num, unsigned size)
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{
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void far *now;
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unsigned total = num * size;
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struct DynS far *Dynp = MK_FP(FP_SEG(LoL), FP_OFF(&Dyn));
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#ifndef DEBUG
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UNREFERENCED_PARAMETER(what);
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#endif
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if ((ULONG) total + Dynp->Allocated > 0xffff)
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{
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printf("PANIC:Dyn %lu\n", (ULONG) total + Dynp->Allocated);
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for (;;) ;
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}
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DebugPrintf(("DYNDATA:allocating %s - %u * %u bytes, total %u, %u..%u\n",
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what, num, size, total, Dynp->Allocated,
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Dynp->Allocated + total));
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now = (void far *)&Dynp->Buffer[Dynp->Allocated];
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fmemset(now, 0, total);
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Dynp->Allocated += total;
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return now;
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}
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void DynFree(void *ptr)
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{
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struct DynS far *Dynp = MK_FP(FP_SEG(LoL), FP_OFF(&Dyn));
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Dynp->Allocated = (char *)ptr - (char *)Dynp->Buffer;
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}
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void FAR * DynLast()
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{
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struct DynS far *Dynp = MK_FP(FP_SEG(LoL), FP_OFF(&Dyn));
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DebugPrintf(("dynamic data end at %p\n",
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(void FAR *)(Dynp->Buffer + Dynp->Allocated)));
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return Dynp->Buffer + Dynp->Allocated;
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}
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