Rev 54 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 54 | pj | 1 | /* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */ |
| 2 | /* */ |
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| 3 | /* This library is free software; you can redistribute it and/or */ |
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| 4 | /* modify it without any restrictions. This library is distributed */ |
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| 5 | /* in the hope that it will be useful, but without any warranty. */ |
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| 6 | |||
| 7 | /* Multi-chipset support Copyright 1993 Harm Hanemaayer */ |
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| 8 | /* partially copyrighted (C) 1993 by Hartmut Schirmer */ |
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| 9 | |||
| 10 | #include <stdlib.h> |
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| 11 | |||
| 12 | #include "vga.h" |
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| 13 | #include "libvga.h" |
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| 14 | #include "driver.h" |
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| 15 | #include "svgalib_helper.h" |
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| 16 | |||
| 17 | vga_cardinfo *vga_getcardinfo(void) { |
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| 18 | vga_cardinfo *vci; |
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| 19 | |||
| 20 | vci = malloc(sizeof(vga_cardinfo)); |
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| 21 | if(vci==NULL) return vci; |
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| 22 | vci->version = 0x100; |
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| 23 | vci->size = sizeof(vga_cardinfo); |
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| 24 | vci->chipset = __svgalib_chipset; |
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| 25 | vci->physmem = __svgalib_linear_mem_base; |
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| 26 | |||
| 27 | return vci; |
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| 28 | } |
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| 29 | |||
| 30 | void vga_waitretrace(void) |
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| 31 | { |
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| 32 | if (__svgalib_driverspecs->emul && __svgalib_driverspecs->emul->waitretrace) { |
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| 33 | __svgalib_driverspecs->emul->waitretrace(); |
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| 34 | } else { |
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| 35 | while (!(__svgalib_inis1() & 8)); |
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| 36 | while (__svgalib_inis1() & 8); |
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| 37 | } |
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| 38 | } |
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| 39 | |||
| 40 | static void *__svgalib_linearframebuffer; |
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| 41 | /* |
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| 42 | * The way IS_LINEAR gets indicated is rather convoluted; if the driver |
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| 43 | * has EXT_INFO_AVAILABLE, setlinearaddressing will enable |
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| 44 | * the flag in __svgalib_linearset which gets set in the modeinfo by |
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| 45 | * vga_getmodeinfo(). The driver must turn off the flag in |
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| 46 | * __svgalib_linearset if linear addressing gets disabled (e.g. when |
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| 47 | * setting another mode). |
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| 48 | * |
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| 49 | * For any driver, the chipset getmodeinfo flag can examine a hardware |
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| 50 | * register and set the IS_LINEAR flag if linear addressing is enabled. |
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| 51 | */ |
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| 52 | |||
| 53 | unsigned char * |
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| 54 | vga_getgraphmem(void) |
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| 55 | { |
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| 56 | |||
| 81 | giacomo | 57 | DTP(("getgraphmem\n")); |
| 54 | pj | 58 | |
| 59 | if (__svgalib_modeinfo_linearset & LINEAR_MODE ) |
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| 60 | return __svgalib_linearframebuffer; |
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| 61 | return GM; |
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| 62 | } |
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| 63 | |||
| 64 | /* |
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| 65 | * This function is to be called after a SVGA graphics mode set |
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| 66 | * in banked mode. Probing in VGA-compatible textmode is not a good |
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| 67 | * idea. |
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| 68 | */ |
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| 69 | |||
| 70 | /* cf. vga_waitretrace, M.Weller */ |
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| 71 | int vga_setlinearaddressing(void) |
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| 72 | { |
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| 73 | int (*lfn) (int op, int param) = __svgalib_driverspecs->linear; |
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| 74 | vga_modeinfo *modeinfo; |
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| 75 | |||
| 76 | printk(KERN_INFO "Setlinearaddressing\n"); |
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| 77 | |||
| 78 | modeinfo = vga_getmodeinfo(CM); |
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| 79 | if (!(modeinfo->flags&CAPABLE_LINEAR)) return -1; |
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| 80 | |||
| 81 | (*lfn) (LINEAR_ENABLE, 0); |
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| 82 | __svgalib_linearframebuffer = LINEAR_POINTER; |
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| 83 | |||
| 84 | if ((long) __svgalib_linearframebuffer == -1) { |
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| 85 | /* Shouldn't happen. */ |
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| 86 | (*lfn) (LINEAR_DISABLE, 0); |
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| 87 | return -1; |
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| 88 | } |
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| 89 | |||
| 90 | __svgalib_modeinfo_linearset |= IS_LINEAR | LINEAR_MODE; |
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| 91 | |||
| 92 | graph_mem = LINEAR_POINTER; |
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| 93 | |||
| 94 | return __svgalib_linear_mem_size; /* Who cares? */ |
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| 95 | } |