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Rev | Author | Line No. | Line |
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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 | } |