source: rtems/c/src/lib/libbsp/i386/pc386/include/vbe3.h @ c5a74946

4.11
Last change on this file since c5a74946 was c5a74946, checked in by Jan Dolezal <dolezj21@…>, on Nov 20, 2014 at 2:00:32 PM

i386/pc386/include: header files for VESA BIOS EXTENSIONS and VESA Extended Display Identification Data

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1/**
2 * @file vbe3.h
3 *
4 * @ingroup i386_pc386
5 *
6 * @brief VESA Bios Extension definitions.
7 */
8
9/*
10 * vbe3.h  - This file contains definitions for constants related to VBE.
11 *          More information can be found at
12 *      <http://www.vesa.org/vesa-standards/free-standards/>
13 *          VESA public standards may be found at
14 *      <http://www.vesa.org/wp-content/uploads/2010/12/thankspublic.htm>
15 *
16 * Copyright (C) 2014  Jan DoleÅŸal (dolezj21@fel.cvut.cz)
17 *                     CTU in Prague.
18 *
19 *  The license and distribution terms for this file may be
20 *  found in the file LICENSE in this distribution or at
21 *  http://www.rtems.org/license/LICENSE.
22 */
23
24#ifndef _VBE_H
25#define _VBE_H
26
27#ifndef ASM /* ASM */
28
29#include <stdint.h>
30
31#ifdef __cplusplus
32extern "C" {
33#endif /* __cplusplus */
34
35#include <rtems/score/basedefs.h>
36#define VBE3_PACKED_ATTRIBUTE   RTEMS_COMPILER_PACKED_ATTRIBUTE
37
38/*  VESA BIOS EXTENSION (VBE) Core functions Standard
39    Version: 3.0 Date: September 16, 1998               */
40
41/* VBE RETURN STATUS */
42/* AL == 4Fh: Function is supported */
43/* AL != 4Fh: Function is not supported */
44#define VBE_functionSupported        0x4F
45/* AH == 00h: Function call successful */
46#define VBE_callSuccessful           0x00
47/* AH == 01h: Function call failed */
48#define VBE_callFailed               0x01
49/* AH == 02h: Function is not supported in the current hardware configuration */
50#define VBE_notSupportedInCurHWConf  0x02
51/* AH == 03h: Function call invalid in current video mode */
52#define VBE_callInvalid              0x03
53
54/* VBE Mode Numbers */
55/* D0-D8 =  Mode number */
56#define VBE_modeNumberMask         0x01FF
57#define VBE_modeNumberShift          0x00
58/* If D8 == 0, this is not a VESA defined VBE mode */
59#define VBE_VESAmodeMask           0x0100
60/* If D8 == 1, this is a VESA defined VBE mode */
61/* D9-D12 =  Reserved by VESA for future expansion (= 0) */
62#define VBE_VESAmodeShift            0x08
63/* If D11 == 0, Use current BIOS default refresh rate */
64#define VBE_refreshRateCtrlMask    0x0800
65/* If D11 == 1, Use user specified CRTC values for refresh rate */
66/* D12-13 = Reserved for VBE/AF (must be 0) */
67#define VBE_refreshRateCtrlShift     0x0B
68/* If D14 == 0, Use Banked/Windowed Frame Buffer */
69#define VBE_linearFlatFrameBufMask 0x4000
70/* If D14 == 1, Use Linear/Flat Frame Buffer */
71#define VBE_linearFlatFrameBufShift  0x0E
72/* If D15 == 0, Clear display memory */
73#define VBE_preserveDispMemMask    0x8000
74/* If D15 == 1, Preserve display memory */
75#define VBE_preserveDispMemShift     0x0F
76
77/* Graphics modes */
78/* 15-bit mode, Resolution: 640x400,   Colors: 256  */
79#define VBE_R640x400C256      0x100
80/* 15-bit mode, Resolution: 640x480,   Colors: 256  */
81#define VBE_R640x480C256      0x101
82/* 15-bit mode, Resolution: 800x600,   Colors: 16   */
83#define VBE_R800x600C16       0x102
84/* 7-bit mode,  Resolution: 800x600,   Colors: 16   */
85#define VBE_b7R800x600C16     0x6A
86/* 15-bit mode, Resolution: 800x600,   Colors: 256  */
87#define VBE_R800x600C256      0x103
88/* 15-bit mode, Resolution: 1024x768,  Colors: 16   */
89#define VBE_R1024x768C16      0x104
90/* 15-bit mode, Resolution: 1024x768,  Colors: 256  */
91#define VBE_R1024x768C256     0x105
92/* 15-bit mode, Resolution: 1280x1024, Colors: 16   */
93#define VBE_R1280x1024C16     0x106
94/* 15-bit mode, Resolution: 1280x1024, Colors: 256  */
95#define VBE_R1280x1024C256    0x107
96/* 15-bit mode, Resolution: 320x200,   Colors: 32K   (1:5:5:5) */
97#define VBE_R320x200C32K      0x10D
98/* 15-bit mode, Resolution: 320x200,   Colors: 64K   (5:6:5)   */
99#define VBE_R320x200C64K      0x10E
100/* 15-bit mode, Resolution: 320x200,   Colors: 16.8M (8:8:8)   */
101#define VBE_R320x200C17M      0x10F
102/* 15-bit mode, Resolution: 640x480,   Colors: 32K   (1:5:5:5) */
103#define VBE_R640x480C32K      0x110
104/* 15-bit mode, Resolution: 640x480,   Colors: 64K   (5:6:5)   */
105#define VBE_R640x480C64K      0x111
106/* 15-bit mode, Resolution: 640x480,   Colors: 16.8M (8:8:8)   */
107#define VBE_R640x480C17M      0x112
108/* 15-bit mode, Resolution: 800x600,   Colors: 32K   (1:5:5:5) */
109#define VBE_R800x600C32K      0x113
110/* 15-bit mode, Resolution: 800x600,   Colors: 64K   (5:6:5)   */
111#define VBE_R800x600C64K      0x114
112/* 15-bit mode, Resolution: 800x600,   Colors: 16.8M (8:8:8)   */
113#define VBE_R800x600C17M      0x115
114/* 15-bit mode, Resolution: 1024x768,  Colors: 32K   (1:5:5:5) */
115#define VBE_R1024x768C32K     0x116
116/* 15-bit mode, Resolution: 1024x768,  Colors: 64K   (5:6:5)   */
117#define VBE_R1024x768C64K     0x117
118/* 15-bit mode, Resolution: 1024x768,  Colors: 16.8M (8:8:8)   */
119#define VBE_R1024x768C17M     0x118
120/* 15-bit mode, Resolution: 1280x1024, Colors: 32K   (1:5:5:5) */
121#define VBE_R1280x1024C32K    0x119
122/* 15-bit mode, Resolution: 1280x1024, Colors: 64K   (5:6:5)   */
123#define VBE_R1280x1024C64K    0x11A
124/* 15-bit mode, Resolution: 1280x1024, Colors: 16.8M (8:8:8)   */
125#define VBE_R1280x1024C17M    0x11B
126#define VBE_SpecialMode       0x81FF
127
128/* Text modes */
129#define VBE_C80R60            0x108   /* 15-bit mode, Columns: 80,  Rows: 60 */
130#define VBE_C132R25           0x109   /* 15-bit mode, Columns: 132, Rows: 25 */
131#define VBE_C132R43           0x10A   /* 15-bit mode, Columns: 132, Rows: 43 */
132#define VBE_C132R50           0x10B   /* 15-bit mode, Columns: 132, Rows: 50 */
133#define VBE_C132R60           0x10C   /* 15-bit mode, Columns: 132, Rows: 60 */
134
135/* VBE function numbers - passed in AX register */
136#define VBE_RetVBEConInf       0x4F00 /* Return VBE Controller Information */
137#define VBE_RetVBEModInf       0x4F01 /* Return VBE Mode Information */
138#define VBE_SetVBEMod          0x4F02 /* Set VBE Mode */
139#define VBE_RetCurVBEMod       0x4F03 /* Return Current VBE Mode */
140#define VBE_SavResSta          0x4F04 /* Save/Restore State */
141#define VBE_DisWinCon          0x4F05 /* Display Window Control */
142#define VBE_SetGetLogScaLinLen 0x4F06 /* Set/Get Logical Scan Line Length */
143#define VBE_SetGetDisSta       0x4F07 /* Set/Get Display Start */
144#define VBE_SetGetDACPalFor    0x4F08 /* Set/Get DAC Palette Format */
145#define VBE_SetGetPalDat       0x4F09 /* Set/Get Palette Data */
146#define VBE_RetVBEProModInt    0x4F0A /* Return VBE Protected Mode Interface */
147#define VBE_GetSetpixclo       0x4F0B /* Get/Set pixel clock */
148#define VBE_PowManExt          0x4F10 /* Power Management Extensions (PM) */
149#define VBE_FlaPanIntExt       0x4F11 /* Flat Panel Interface Extensions (FP) */
150#define VBE_AudIntExt          0x4F13 /* Audio Interface Extensions (AI) */
151#define VBE_OEMExt             0x4F14 /* OEM Extensions */
152#define VBE_DisDatCha          0x4F15 /* Display Data Channel (DDC),
153                                         Serial Control Interface (SCI) */
154
155/* VBE subfunction numbers - passed in BL register */
156#define VBE_RetVBESupSpeInf    0x00  /* Return VBE Supplemental
157                                        Specification Information */
158/* *** Structures *** */
159struct VBE_FarPtr {
160    uint16_t offset;
161    uint16_t selector;
162} VBE3_PACKED_ATTRIBUTE;
163
164struct VBE_PMInfoBlock {
165    uint8_t   Signature[4];    /*  PM Info Block Signature */
166    uint16_t  EntryPoint;      /*  Offset of PM entry point within BIOS */
167    uint16_t  PMInitialize;    /*  Offset of PM initialization entry point */
168    uint16_t  BIOSDataSel;     /*  Selector to BIOS data area emulation block */
169    uint16_t  A0000Sel;        /*  Selector to access A0000h physical mem */
170    uint16_t  B0000Sel;        /*  Selector to access B0000h physical mem */
171    uint16_t  B8000Sel;        /*  Selector to access B8000h physical mem */
172    uint16_t  CodeSegSel;      /*  Selector to access code segment as data */
173    uint8_t   InProtectMode;   /*  Set to 1 when in protected mode */
174    uint8_t   Checksum;        /*  Checksum byte for structure */
175} VBE3_PACKED_ATTRIBUTE;
176
177/* General VBE signature */
178#define VBE_SIGNATURE "VESA"
179/* Signature for VBE 2.0 and higher */
180#define VBE20plus_SIGNATURE "VBE2"
181/* for STUB see VBE CORE FUNCTIONS VERSION 3.0 - Appendix 1 */
182#define VBE_END_OF_VideoModeList 0xFFFF
183#define VBE_STUB_VideoModeList 0xFFFF
184struct VBE_VbeInfoBlock {
185    uint8_t   VbeSignature[4];   /*  VBE Signature */
186    uint16_t  VbeVersion;        /*  VBE Version */
187    uint8_t  *OemStringPtr;      /*  VbeFarPtr to OEM String */
188    uint8_t   Capabilities[4];   /*  Capabilities of graphics controller */
189    uint32_t *VideoModePtr;      /*  VbeFarPtr to VideoModeList */
190    uint16_t  TotalMemory;       /*  Number of 64kb memory blocks    */
191    /*  Added for VBE 2.0+ */
192    uint16_t  OemSoftwareRev;    /*  VBE implementation Software revision */
193    uint8_t  *OemVendorNamePtr;  /*  VbeFarPtr to Vendor Name String */
194    uint8_t  *OemProductNamePtr; /*  VbeFarPtr to Product Name String */
195    uint8_t  *OemProductRevPtr;  /*  VbeFarPtr to Product Revision String */
196    uint8_t   Reserved[222];     /*  Reserved for VBE implementation scratch */
197    /*    area */
198    uint8_t   OemData[256];      /*  Data Area for OEM Strings */
199} VBE3_PACKED_ATTRIBUTE;
200
201struct VBE_ModeInfoBlock {
202    /*  Mandatory information for all VBE revisions */
203    uint16_t  ModeAttributes;        /* mode attributes */
204    uint8_t   WinAAttributes;        /* window A attributes */
205    uint8_t   WinBAttributes;        /* window B attributes */
206    uint16_t  WinGranularity;        /* window granularity */
207    uint16_t  WinSize;               /* window size */
208    uint16_t  WinASegment;           /* window A start segment */
209    uint16_t  WinBSegment;           /* window B start segment */
210    uint32_t *WinFuncPtr;            /* real mode pointer to window function */
211    uint16_t  BytesPerScanLine;      /* bytes per scan line */
212    /*  Mandatory information for VBE 1.2 and above */
213    uint16_t  XResolution;           /* horizontal resolution in px or chars */
214    uint16_t  YResolution;           /* vertical resolution in px or chars */
215    uint8_t   XCharSize;             /* character cell width in pixels */
216    uint8_t   YCharSize;             /* character cell height in pixels */
217    uint8_t   NumberOfPlanes;        /* number of memory planes */
218    uint8_t   BitsPerPixel;          /* bits per pixel */
219    uint8_t   NumberOfBanks;         /* number of banks */
220    uint8_t   MemoryModel;           /* memory model type */
221    uint8_t   BankSize;              /* bank size in KB */
222    uint8_t   NumberOfImagePages;    /* number of images */
223    uint8_t   Reserved0;             /* reserved for page function */
224    /*  Direct Color fields (required for direct/6 and YUV/7 memory models) */
225    uint8_t   RedMaskSize;           /* size of direct color red mask in bits */
226    uint8_t   RedFieldPosition;      /* bit position of lsb of red mask */
227    uint8_t   GreenMaskSize;         /* size of direct color green mask in b */
228    uint8_t   GreenFieldPosition;    /* bit position of lsb of green mask */
229    uint8_t   BlueMaskSize;          /* size of direct color blue mask in b */
230    uint8_t   BlueFieldPosition;     /* bit position of lsb of blue mask */
231    uint8_t   RsvdMaskSize;          /* size of direct color reserved mask */
232    uint8_t   RsvdFieldPosition;     /* bit position of lsb of reserved mask */
233    uint8_t   DirectColorModeInfo;   /* direct color mode attributes */
234    /*  Mandatory information for VBE 2.0 and above */
235    uint32_t *PhysBasePtr;           /* physical address for
236                                        flat memory frame buffer */
237    uint32_t  Reserved1;             /* Reserved - always set to 0 */
238    uint16_t  Reserved2;             /* Reserved - always set to 0 */
239    /*  Mandatory information for VBE 3.0 and above */
240    uint16_t  LinBytesPerScanLine;   /* bytes per scan line for linear modes */
241    uint8_t   BnkNumberOfImagePages; /* number of images for banked modes */
242    uint8_t   LinNumberOfImagePages; /* number of images for linear modes */
243        /* linear modes */
244    uint8_t   LinRedMaskSize;        /* size of direct color red mask */
245    uint8_t   LinRedFieldPosition;   /* bit position of lsb of red mask */
246    uint8_t   LinGreenMaskSize;      /* size of direct color green mask  */
247    uint8_t   LinGreenFieldPosition; /* bit position of lsb of green mask */
248    uint8_t   LinBlueMaskSize;       /* size of direct color blue mask  */
249    uint8_t   LinBlueFieldPosition;  /* bit position of lsb of blue mask */
250    uint8_t   LinRsvdMaskSize;       /* size of direct color reserved mask */
251    uint8_t   LinRsvdFieldPosition;  /* bit position of lsb of reserved mask */
252    uint32_t  MaxPixelClock;         /* maximum pixel clock
253                                        (in Hz) for graphics mode */
254    uint8_t   Reserved3[189];        /* remainder of ModeInfoBlock */
255} VBE3_PACKED_ATTRIBUTE;
256
257struct VBE_CRTCInfoBlock {
258    uint16_t  HorizontalTotal;       /* Horizontal total in pixels */
259    uint16_t  HorizontalSyncStart;   /* Horizontal sync start in pixels */
260    uint16_t  HorizontalSyncEnd;     /* Horizontal sync end in pixels */
261    uint16_t  VerticalTotal;         /* Vertical total in lines */
262    uint16_t  VerticalSyncStart;     /* Vertical sync start in lines */
263    uint16_t  VerticalSyncEnd;       /* Vertical sync end in lines */
264    uint8_t   Flags;                 /* Flags (Interlaced, Double Scan etc) */
265    uint32_t  PixelClock;            /* Pixel clock in units of Hz */
266    uint16_t  RefreshRate;           /* Refresh rate in units of 0.01 Hz */
267    uint8_t   Reserved[40];          /* remainder of ModeInfoBlock */
268} VBE3_PACKED_ATTRIBUTE;
269
270struct VBE_PaletteEntry {
271    uint8_t   Blue;                  /* Blue channel value (6 or 8 bits) */
272    uint8_t   Green;                 /* Green channel value (6 or 8 bits) */
273    uint8_t   Red;                   /* Red channel value(6 or 8 bits) */
274    uint8_t   Alignment;             /* DWORD alignment byte (unused) */
275} VBE3_PACKED_ATTRIBUTE;
276
277struct VBE_SupVbeInfoBlock {
278    uint8_t   SupVbeSignature[7];    /* Supplemental VBE Signature */
279    uint16_t  SupVbeVersion;         /* Supplemental VBE Version */
280    uint8_t   SupVbeSubFunc[8];      /* Bitfield of supported subfunctions */
281    uint16_t  OemSoftwareRev;        /* OEM Software revision */
282    uint8_t  *OemVendorNamePtr;      /* VbeFarPtr to Vendor Name String */
283    uint8_t  *OemProductNamePtr;     /* VbeFarPtr to Product Name String */
284    uint8_t  *OemProductRevPtr;      /* VbeFarPtr to Product Revision String */
285    uint8_t  *OemStringPtr;          /* VbeFarPtr to OEM String */
286    uint8_t   Reserved[221];         /* Reserved for description
287                                        strings and future */
288    /*  expansion */
289} VBE3_PACKED_ATTRIBUTE;
290
291/* VbeInfoBlock Capabilities */
292/*  D0 = 0  DAC is fixed width, with 6 bits per primary color */
293/*     = 1 DAC width is switchable to 8 bits per primary color */
294#define VBE_DACswitchableMask     0x0001
295/*  D1 = 0 Controller is VGA compatible */
296/*     = 1 Controller is not VGA compatible */
297#define VBE_notVGAcompatibleMask  0x0002
298/*  D2 = 0 Normal RAMDAC operation */
299/*     = 1 When programming large blocks of information to the RAMDAC,
300            use the blank bit in Function 09h. */
301#define VBE_specialRAMDACopMask   0x0004
302/*  D3 = 0 No hardware stereoscopic signaling support */
303/*     = 1 Hardware stereoscopic signaling supported by controller */
304#define VBE_hwStereoscopicMask    0x0008
305/*  D4 = 0 Stereo signaling supported via external VESA stereo connector */
306/*     = 1 Stereo signaling supported via VESA EVC connector */
307#define VBE_supportEVCconnMask    0x0010
308/*  D5-31 = Reserved */
309
310/* ModeInfoBlock ModeAttributes */
311/*  D0 =  Mode supported by hardware configuration */
312/*   0 =  Mode not supported in hardware */
313/*   1 =  Mode supported in hardware */
314#define VBE_modSupInHWMask        0x0001
315/*  D1 =  1 (Reserved) */
316/*  D2 =  TTY Output functions supported by BIOS */
317/*   0 =  TTY Output functions not supported by BIOS */
318/*   1 =  TTY Output functions supported by BIOS */
319#define VBE_TTYOutSupByBIOSMask   0x0004
320/*  D3 =  Monochrome/color mode (see note below) */
321/*   0 =  Monochrome mode */
322/*   1 =  Color mode */
323#define VBE_ColorModeMask         0x0008
324/*  D4 =  Mode type */
325/*   0 =  Text mode */
326/*   1 =  Graphics mode */
327#define VBE_GraphicsModeMask      0x0010
328/*  D5 =  VGA compatible mode */
329/*   0 =  Yes */
330/*   1 =  No */
331#define VBE_VGACompModeMask       0x0020
332/*  D6 =  VGA compatible windowed memory mode is available */
333/*   0 =  Yes */
334/*   1 =  No */
335#define VBE_VGACompWinMemModeMask 0x0040
336/*  D7 =  Linear frame buffer mode is available */
337/*   0 =  No */
338/*   1 =  Yes */
339#define VBE_LinFraBufModeAvaiMask 0x0080
340/*  D8 =  Double scan mode is available */
341/*   0 =  No */
342/*   1 =  Yes */
343#define VBE_DblScnModeAvaiMask    0x0100
344/*  D9 =  Interlaced mode is available */
345/*   0 =  No */
346/*   1 =  Yes */
347#define VBE_InterlModeAvaiMask    0x0200
348/*  D10 =  Hardware triple buffering support */
349/*   0 =  No */
350/*   1 =  Yes */
351#define VBE_HWTripBufSupMask      0x0400
352/*  D11 =  Hardware stereoscopic display support */
353/*   0 =  No */
354/*   1 =  Yes */
355#define VBE_HWSterDispSupMask     0x0800
356/*  D12 =  Dual display start address support */
357/*   0 =  No */
358/*   1 =  Yes */
359#define VBE_DualDispStAdrSupMask  0x1000
360/*  D13-D15 =  Reserved */
361
362/* ModeInfoBlock WinXAttributes */
363/*  D0 =  Relocatable window(s) supported */
364/*   0 =  Single non-relocatable window only */
365/*   1 =  Relocatable window(s) are supported */
366#define VBE_RelocWinSupMask       0x01
367/*  D1 =  Window readable */
368/*   0 =  Window is not readable */
369/*   1 =  Window is readable */
370#define VBE_WinReadableMask       0x02
371/*  D2 =  Window writeable */
372/*   0 =  Window is not writeable */
373/*   1 =  Window is writeable */
374#define VBE_WinWritableMask       0x04
375/*  D3-D7 =  Reserved */
376
377/* ModeInfoBlock MemoryModel */
378#define VBE_TextMode              0x00
379#define VBE_CGAGraphics           0x01
380#define VBE_HerculesGraphics      0x02
381#define VBE_Planar                0x03
382#define VBE_PackedPixel           0x04
383#define VBE_NonChain4Color256     0x05
384#define VBE_DirectColor           0x06
385#define VBE_YUV                   0x07
386    /* 0x08-0x0F Reserved, to be defined by VESA */
387    /* 0x10-0xFF To be defined by OEM */
388
389/* ModeInfoBlock DirectColorModeInfo */
390/*  D0 =  Color ramp is fixed/programmable */
391/*   0 =  Color ramp is fixed */
392/*   1 =  Color ramp is programmable */
393#define VBE_ColRampProgMask       0x01
394/*  D1 =  Bits in Rsvd field are usable/reserved */
395/*   0 =  Bits in Rsvd field are reserved */
396/*   1 =  Bits in Rsvd field are usable by the application */
397#define VBE_RsvdBitsUsableMask    0x02
398
399/* CRTCInfoBlock Flags */
400/*  D0 =  Double Scan Mode Enable */
401/*   0 =  Graphics mode is not double scanned */
402/*   1 =  Graphics mode is double scanned */
403#define VBE_GrModeDblScanMask     0x01
404/*  D1 =  Interlaced Mode Enable */
405/*   0 =  Graphics mode is non-interlaced */
406/*   1 =  Graphics mode is interlaced */
407#define VBE_GrModeInterlMask      0x02
408/*  D2 =  Horizontal sync polarity */
409/*   0 =  Horizontal sync polarity is positive (+) */
410/*   1 =  Horizontal sync polarity is negative (-) */
411#define VBE_HorSncPolNegMask      0x04
412/*  D3 =  Vertical sync polarity */
413/*   0 =  Vertical sync polarity is positive (+) */
414/*   1 =  Vertical sync polarity is negative (-) */
415#define VBE_VerSncPolNegMask      0x08
416
417
418/*  VESA BIOS Extensions/Display Data Channel Standard
419    Version: 1.1 November 18, 1999                      */
420
421/* VBE/DDC subfunction numbers - passed in BL register */
422#define VBEDDC_Capabilities    0x0   /* Report VBE/DDC Capabilities */
423#define VBEDDC_ReadEDID        0x1   /* Read EDID */
424
425/* DDC Capabilities */
426/* DDC level supported - returned in BL register */
427/* 0 - DDC1 not supported; 1 - DDC1 supported */
428#define VBEDDC_1SupportedMask  0x1
429/* 0 - DDC2 not supported; 1 - DDC2 supported */
430#define VBEDDC_2SupportedMask  0x2
431/* 0 - Screen not blanked during data transfer;
432   1 - Screen blanked during data transfer */
433#define VBEDDC_scrBlnkDatTrMs  0x4
434
435
436/*  VESA BIOS Extensions/Serial Control Interface Standard
437    Version: 1.0 Revision: 2 Date: July 2, 1997         */
438
439/* VBE/SCI subfunction numbers - passed in BL register */
440#define VBESCI_ReportCapabil   0x10  /* Report VBE/SCI Capabilities */
441#define VBESCI_BegSCLSDACtrl   0x11  /* Begin SCL/SDA control */
442#define VBESCI_EndSCLSDACtrl   0x12  /* End SCL/SDA control */
443#define VBESCI_WrtSCLClkLine   0x13  /* Write SCL clock line */
444#define VBESCI_WrtSDADatLine   0x14  /* Write SDA data line */
445#define VBESCI_RdySCLClkLine   0x15  /* Read SCL clock line */
446#define VBESCI_RdySDADatLine   0x16  /* Read SDA data line */
447
448/* SCI Capabilities */
449/* I2C level supported - returned in BL register */
450#define VBESCI_capSCLwrtMask   0x1   /* Can write to SCL clock line */
451#define VBESCI_capSDAwrtMask   0x2   /* Can write to SDA data line */
452#define VBESCI_capSCLrdyMask   0x4   /* Can read from SCL clock line */
453#define VBESCI_capSDArdyMask   0x8   /* Can read from SDA data line */
454
455
456#ifdef __cplusplus
457}
458#endif /* __cplusplus */
459
460#endif /* ASM */
461
462#endif /* _VBE_H */
463
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