1vga_getgraphmem(3) Svgalib User Manual vga_getgraphmem(3)
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6 vga_getgraphmem - returns the address of the VGA memory
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9 #include <vga.h>
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11 unsigned char *graph_mem; /* This declaration is already in vga.h */
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13 unsigned char *vga_getgraphmem(void);
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17 returns a pointer to the 64K VGA frame buffer window. vga_setpage(3),
18 vga_setreadpage(3) and vga_setwritepage(3) allow to select which page
19 of the VGA memory shows up at this position. vga_setlinearaddress‐
20 ing(3) maps all VGA memory at a consecutive memory area (if the hard‐
21 ware supports it). In this mode, vga_getgraphmem() will return the
22 location of this area too. You can also access the global variable
23 graph_mem, which will also contain this address.
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25 Most demos, esp. vgatest(6) show the simple direct use of this func‐
26 tion to access screen memory.
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30 svgalib(7), vgatest(6), fun(6), testlinear(6), vga_setlinearaddress‐
31 ing(3), vga_claimvideomemory(3), vga_getmodeinfo(3), vga_setpage(3),
32 vga_setreadpage(3), vga_setwritepage(3),
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36 This manual page was edited by Michael Weller <eowmob@exp-math.uni-
37 essen.de>. The exact source of the referenced function as well as of
38 the original documentation is unknown.
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40 It is very likely that both are at least to some extent are due to Harm
41 Hanemaayer <H.Hanemaayer@inter.nl.net>.
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43 Occasionally this might be wrong. I hereby asked to be excused by the
44 original author and will happily accept any additions or corrections to
45 this first version of the svgalib manual.
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49Svgalib (>= 1.2.11) 27 July 1997 vga_getgraphmem(3)