huwcampbell.com
Reactos
1/*
2 * PROJECT: ReactOS Console Text-Mode Device Driver
3 * LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
4 * PURPOSE: Loading specific fonts into VGA.
5 * COPYRIGHT: Copyright 2008-2019 Aleksey Bragin (aleksey@reactos.org)
6 * Copyright 2008-2019 Colin Finck (mail@colinfinck.de)
7 * Copyright 2008-2019 Christoph von Wittich (christoph_vw@reactos.org)
8 */
9
10/* INCLUDES ***************************************************************/
11
12#include "blue.h"
13
14//
15// FIXME: For the moment we support only a fixed 256-char 8-bit font.
16//
17
18VOID OpenBitPlane(VOID);
19VOID CloseBitPlane(VOID);
20VOID LoadFont(_In_ PUCHAR Bitplane, _In_ PUCHAR FontBitfield);
21
22/* FUNCTIONS ****************************************************************/
23
24VOID
25ScrSetFont(
26 _In_ PUCHAR FontBitfield)
27{
28 PHYSICAL_ADDRESS BaseAddress;
29 PUCHAR Bitplane;
30
31 /* open bit plane for font table access */
32 OpenBitPlane();
33
34 /* get pointer to video memory */
35 BaseAddress.QuadPart = BITPLANE_BASE;
36 Bitplane = (PUCHAR)MmMapIoSpace(BaseAddress, 0xFFFF, MmNonCached);
37
38 LoadFont(Bitplane, FontBitfield);
39
40 MmUnmapIoSpace(Bitplane, 0xFFFF);
41
42 /* close bit plane */
43 CloseBitPlane();
44}
45
46/* PRIVATE FUNCTIONS *********************************************************/
47
48/* Font-load specific funcs */
49VOID
50OpenBitPlane(VOID)
51{
52 /* disable interrupts */
53 _disable();
54
55 /* sequence reg */
56 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_RESET); WRITE_PORT_UCHAR(SEQ_DATA, 0x01);
57 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_ENABLE_WRT_PLANE); WRITE_PORT_UCHAR(SEQ_DATA, 0x04);
58 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_MEM_MODE); WRITE_PORT_UCHAR(SEQ_DATA, 0x07);
59 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_RESET); WRITE_PORT_UCHAR(SEQ_DATA, 0x03);
60
61 /* graphic reg */
62 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_READ_PLANE); WRITE_PORT_UCHAR(GCT_DATA, 0x02);
63 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_RW_MODES); WRITE_PORT_UCHAR(GCT_DATA, 0x00);
64 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_GRAPH_MODE); WRITE_PORT_UCHAR(GCT_DATA, 0x00);
65
66 /* enable interrupts */
67 _enable();
68}
69
70VOID
71CloseBitPlane(VOID)
72{
73 /* disable interrupts */
74 _disable();
75
76 /* sequence reg */
77 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_RESET); WRITE_PORT_UCHAR(SEQ_DATA, 0x01);
78 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_ENABLE_WRT_PLANE); WRITE_PORT_UCHAR(SEQ_DATA, 0x03);
79 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_MEM_MODE); WRITE_PORT_UCHAR(SEQ_DATA, 0x03);
80 WRITE_PORT_UCHAR(SEQ_COMMAND, SEQ_RESET); WRITE_PORT_UCHAR(SEQ_DATA, 0x03);
81
82 /* graphic reg */
83 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_READ_PLANE); WRITE_PORT_UCHAR(GCT_DATA, 0x00);
84 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_RW_MODES); WRITE_PORT_UCHAR(GCT_DATA, 0x10);
85 WRITE_PORT_UCHAR(GCT_COMMAND, GCT_GRAPH_MODE); WRITE_PORT_UCHAR(GCT_DATA, 0x0e);
86
87 /* enable interrupts */
88 _enable();
89}
90
91VOID
92LoadFont(
93 _In_ PUCHAR Bitplane,
94 _In_ PUCHAR FontBitfield)
95{
96 UINT32 i, j;
97
98 for (i = 0; i < 256; i++)
99 {
100 for (j = 0; j < 8; j++)
101 {
102 *Bitplane = FontBitfield[i * 8 + j];
103 Bitplane++;
104 }
105
106 // padding
107 for (j = 8; j < 32; j++)
108 {
109 *Bitplane = 0;
110 Bitplane++;
111 }
112 }
113}