d4a9888f7b
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@269 6ac86273-5f31-0410-b378-82cca8765d1b
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
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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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FCB's, 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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void *DynAlloc(char FAR *what, unsigned num, unsigned size)
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{
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void *now;
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unsigned total = num * size;
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UNREFERENCED_PARAMETER(what);
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DebugPrintf(("DYNDATA:allocating %Fs - %u * %u bytes, total %u, %u..%u\n",
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what, num, size, total, Dyn.Allocated,Dyn.Allocated+total));
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if (total > Dyn.AllocMax - Dyn.Allocated)
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{
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printf("DYNDATA overflow");
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for (;;);
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}
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now = (void*)&Dyn.Buffer[Dyn.Allocated];
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Dyn.Allocated += total;
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return now;
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}
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void DynFree(unsigned memory_needed)
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{
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if (memory_needed == 0) /* this is pass 0 */
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{
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Dyn.Allocated = NDEV*sizeof(ddt); /* this reserves space for initDisk */
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Dyn.AllocMax = sizeof(Dyn.Buffer);
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}
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else {
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/* enlarge kernel data segment to 64K */
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if (memory_needed + Dyn.UsedByDiskInit > sizeof(Dyn.Buffer))
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{
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if ((ULONG)memory_needed + Dyn.UsedByDiskInit > 0xffff)
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{
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printf("PANIC:Dyn %lu\n",memory_needed + Dyn.UsedByDiskInit);
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for (;;);
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}
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MoveKernel(FP_SEG(&Dyn.UsedByDiskInit) + 0x1000);
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Dyn.AllocMax = 0xffff - (unsigned)&Dyn.Buffer;
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}
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Dyn.Allocated = Dyn.UsedByDiskInit;
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}
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DebugPrintf(("DYNDATA:free to %u, max %u\n",Dyn.Allocated,Dyn.AllocMax));
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}
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void FAR *DynLast()
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{
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DebugPrintf(("dynamic data end at %p\n",(void FAR *)(Dyn.Buffer+Dyn.Allocated)));
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return Dyn.Buffer+Dyn.Allocated;
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}
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