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Digital Research
This commit is contained in:
Sepp J Morris
2020-11-06 18:50:37 +01:00
parent 621ed8ccaf
commit 31738079c4
8481 changed files with 1888323 additions and 0 deletions
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39
CPM OPERATING SYSTEMS/CPM 68K/1.0X SOURCES/v101/clib/basepage.h Normal file
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/****************************************************************************/
/* */
/* B A S E P A G E . H */
/* ------------------- */
/* */
/* This file contains a definition of the CP/M basepage structure, */
/* b_page. */
/* */
/* NOTE: In the portable CP/M environment, it is NOT guaranteed */
/* that the location of the base page is known at link-edit time */
/* (as it is, for example, in CP/M-80 and CP/M-86.) Instead, a */
/* pointer to the current basepage is delivered by the BDOS */
/* to each new program which is run. This pointer, _base, is */
/* initialized by the C startup function (startup.s) and is */
/* available to C programs as an external. */
/* */
/* "cpm.h" MUST be '#include'd before this file */
/* */
/****************************************************************************/
struct b_page
{
BYTE *ltpa; /* Low TPA address */
BYTE *htpa; /* High TPA address */
BYTE *lcode; /* Start address of code seg*/
LONG codelen; /* Code segment length */
BYTE *ldata; /* Start address of data seg*/
LONG datalen; /* Data segment length */
BYTE *lbss; /* Start address of bss seg */
LONG bsslen; /* Bss segment length */
LONG freelen; /* Free segment length */
BYTE resvd1[20]; /* Reserved area */
struct fcb fcb2; /* Second basepage FCB */
struct fcb fcb1; /* First basepage FCB */
BYTE buff[128]; /* Default DMA buffer, */
/* command line tail */
};
extern struct b_page *_base;