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1.1 root 1: /******************************Module*Header*******************************\
2: * Module Name: hardware.c
3: *
4: * Hardware dependent initialization
5: *
6: * Copyright (c) 1992 Microsoft Corporation
7: *
8: \**************************************************************************/
9:
10: #include "driver.h"
11:
12: VOID vBlowCache(PPDEV ppdev);
13:
14: /*****************************************************************************
15: * vSaveOffScreenMemory
16: ****************************************************************************/
17: VOID vSaveOffScreenMemory(PPDEV ppdev)
18: {
19: WORD cmd;
20: ULONG i;
21: WORD* pwBuffer;
22:
23: DISPDBG((2, "S3.DLL!vSaveOffScreenMemory - Entry\n"));
24:
25: if (ppdev->pOffScreenSaveBuffer == NULL)
26: {
27: ppdev->pOffScreenSaveBuffer = (PWORD) LocalAlloc(LPTR, (OFF_SCREEN_CX * OFF_SCREEN_CY));
28:
29: if (ppdev->pOffScreenSaveBuffer == NULL)
30: {
31: DISPDBG((0, "S3.DLL: vSaveOffScreenMemory - LocalAlloc failed \n"));
32: return;
33: }
34: }
35:
36: // Transfer the image (that happens to be the off screen memory)
37: // from the screen to host memory.
38:
39: cmd = RECTANGLE_FILL | BYTE_SWAP | BUS_SIZE_16 |
40: DRAWING_DIR_TBLRXM | DIR_TYPE_XY | WAIT |
41: DRAW | LAST_PIXEL_ON | READ;
42:
43: FIFOWAIT(FIFO_7_EMPTY);
44:
45: TEST_AND_SET_RD_MASK(0xff);
46: OUTPW (MULTIFUNC_CNTL, (DATA_EXTENSION | ALL_ONES));
47:
48: OUTPW (CUR_X, 0);
49: OUTPW (CUR_Y, OFF_SCREEN_Y);
50: OUTPW (RECT_WIDTH, (OFF_SCREEN_CX - 1));
51: OUTPW (MULTIFUNC_CNTL, (RECT_HEIGHT | (OFF_SCREEN_CY - 1)));
52:
53: OUTPW (CMD, cmd);
54:
55: // Wait for the Data Available.
56:
57: while (!(INPW(GP_STAT) & READ_DATA_AVAILABLE));
58:
59: // Now transfer the data from the screen to the host memory bitmap.
60:
61: // NOTE: We call vDataPortIn once for each scan instead of doing just
62: // one large call to vDataPortIn because for some reason some machines
63: // choke on a REP INSW of that large a size -- the S3 gets into a mode
64: // such that even when the transfer is completely done, it still
65: // claims there's more data to be sent. This happens on the machine
66: // regardless of S3 chip type, but this seems to be an effective work-
67: // around for all cases:
68:
69: pwBuffer = (WORD*) ppdev->pOffScreenSaveBuffer;
70: for (i = OFF_SCREEN_CY; i > 0; i--)
71: {
72: vDataPortIn(ppdev, pwBuffer, OFF_SCREEN_CX / 2);
73: pwBuffer += OFF_SCREEN_CX / 2;
74: }
75:
76: }
77:
78:
79: /*****************************************************************************
80: *
81: ****************************************************************************/
82: VOID vRestoreOffScreenMemory(PPDEV ppdev)
83: {
84: WORD cmd;
85:
86:
87: DISPDBG((2, "S3.DLL!vRestoreOffScreenMemory - Entry\n"));
88:
89: // If there is no buffer then just return.
90:
91: if (ppdev->pOffScreenSaveBuffer == NULL) {
92:
93: // This will happen when we're in a low memory condition.
94:
95: vBlowCache(ppdev);
96: return;
97: }
98:
99: // Transfer the image (that happens to be the off screen memory)
100: // from host memory to the off screen memory.
101:
102: cmd = RECTANGLE_FILL | BYTE_SWAP | BUS_SIZE_16 |
103: DRAWING_DIR_TBLRXM | DIR_TYPE_XY | WAIT |
104: DRAW | LAST_PIXEL_ON | WRITE;
105:
106: FIFOWAIT(FIFO_8_EMPTY);
107:
108: TEST_AND_SET_WRT_MASK(0xff);
109: OUTPW (MULTIFUNC_CNTL, (DATA_EXTENSION | ALL_ONES));
110: TEST_AND_SET_FRGD_MIX(SRC_CPU_DATA | OVERPAINT);
111:
112: OUTPW (CUR_X, 0);
113: OUTPW (CUR_Y, OFF_SCREEN_Y);
114: OUTPW (RECT_WIDTH, (OFF_SCREEN_CX - 1));
115: OUTPW (MULTIFUNC_CNTL, (RECT_HEIGHT | (OFF_SCREEN_CY - 1)));
116:
117: OUTPW (CMD, cmd);
118:
119: // Now transfer the data from the screen to the host memory bitmap.
120:
121: vDataPortOut(ppdev, ppdev->pOffScreenSaveBuffer, ((OFF_SCREEN_CX * OFF_SCREEN_CY)/2));
122:
123: // We free this up for two reasons:
124: // 1) Going to/from Full Screen mode is slow, no one will
125: // notice the Alloc/Free.
126: // 2) It's not nice to keep a 256K chunk of memory around when
127: // one really doesn't need it.
128: //
129:
130: LocalFree(ppdev->pOffScreenSaveBuffer);
131: ppdev->pOffScreenSaveBuffer = NULL;
132: }
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