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40 lines
1.8 KiB
C
40 lines
1.8 KiB
C
/****************************************************************************/
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/* */
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/* B A S E P A G E . H */
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/* ------------------- */
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/* */
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/* This file contains a definition of the CP/M basepage structure, */
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/* b_page. */
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/* */
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/* NOTE: In the portable CP/M environment, it is NOT guaranteed */
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/* that the location of the base page is known at link-edit time */
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/* (as it is, for example, in CP/M-80 and CP/M-86.) Instead, a */
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/* pointer to the current basepage is delivered by the BDOS */
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/* to each new program which is run. This pointer, _base, is */
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/* initialized by the C startup function (startup.s) and is */
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/* available to C programs as an external. */
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/* */
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/* "cpm.h" MUST be '#include'd before this file */
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/* */
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/****************************************************************************/
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struct b_page
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{
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BYTE *ltpa; /* Low TPA address */
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BYTE *htpa; /* High TPA address */
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BYTE *lcode; /* Start address of code seg*/
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LONG codelen; /* Code segment length */
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BYTE *ldata; /* Start address of data seg*/
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LONG datalen; /* Data segment length */
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BYTE *lbss; /* Start address of bss seg */
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LONG bsslen; /* Bss segment length */
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LONG freelen; /* Free segment length */
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BYTE resvd1[20]; /* Reserved area */
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struct fcb fcb2; /* Second basepage FCB */
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struct fcb fcb1; /* First basepage FCB */
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BYTE buff[128]; /* Default DMA buffer, */
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/* command line tail */
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};
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extern struct b_page *_base;
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