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1.1 root 1: /*++
2:
3: Copyright (c) 1992 Microsoft Corporation
4:
5: Module Name:
6:
7: Jaguar.s
8:
9: Abstract:
10:
11: This module contains the Jaguar specific routines for the GDI driver.
12:
13: Environment:
14:
15: User mode.
16:
17: Revision History:
18:
19: --*/
20:
21: #include "kxmips.h"
22:
23: #define FG_COLOR 0x48
24: #define BG_COLOR 0x50
25: #define USED_ENTRIES 0x20
26:
27: #define FifoSize 16
28:
29: .globl FifoRegs // extern PJAGUAR_FIFO FifoRegs;
30: .globl Jaguar // extern PJAGUAR_REGISTERS Jaguar;
31: .globl FreeEntries
32: .data
33:
34: FifoRegs:
35: .word 0
36: Jaguar:
37: .word 0
38: FreeEntries:
39: .byte 0 // UCHAR FreeEntries = 0;
40:
41:
42: .text
43:
44:
45: /*++
46: VOID
47: FifoWrite(
48: IN ULONG DstAdr,
49: IN ULONG SrcAdr,
50: IN ULONG XYCmd
51: )
52:
53:
54: Routine Description:
55:
56: This routine writes a command to the jaguar fifo.
57:
58: Arguments:
59:
60: DstAdr - Src Address to write to the SrcAdr FIFO register
61: SrcAdr Dst Address to write to the DstAdr FIFO register
62: XYCmd XYCmd value to write to the XYCmd FIFO register
63:
64: Return Value:
65:
66: NONE
67:
68: {
69: while (FreeEntries == 0) {
70: UsedEntries = READ_REGISTER_UCHAR(&Jaguar->FifoUsedEntries.Byte);
71: FreeEntries = FifoSize - UsedEntries;
72: }
73:
74: WRITE_REGISTER_ULONG(&FifoRegs->DstAddr.Long,DstAdr);
75: WRITE_REGISTER_ULONG(&FifoRegs->SrcAddr.Long,SrcAdr);
76: WRITE_REGISTER_ULONG(&FifoRegs->XYCmd.Long,XYCmd);
77:
78: FreeEntries--;
79: }
80: --*/
81: LEAF_ENTRY(FifoWrite)
82:
83: lbu t0,FreeEntries // get number of Free Entries
84: lw t1,FifoRegs // get base of Fifo
85: bne t0,zero,Write // if Free Entries go to write
86: lw t2,Jaguar // load base of Jaguar
87: Poll:
88: lbu t3,USED_ENTRIES(t2) // read used entries
89: li t4,FifoSize // Compute free entries
90: subu t0,t4,t3 // if none is free
91: beq t0,zero,Poll // keep polling.
92:
93: Write:
94: sw a0,0x0(t1) // Write command to fifo
95: sw a1,0x8(t1) //
96: sw a2,0x10(t1) //
97: addiu t0,t0,-1 // update free entries.
98: sb t0,FreeEntries //
99: j ra
100: .end
101:
102:
103: /*++
104: VOID
105: WaitForJaguarIdle(
106: )
107:
108:
109: Routine Description:
110:
111: This routine must wait for the FIFO to drain.
112: This routine is called to make sure the accelerator
113: has completed all pending commands and the GDI engine can
114: do the operations the driver does not support.
115:
116: Arguments:
117:
118: None.
119:
120: Return Value:
121:
122: It returns when the FIFO is empty.
123:
124: {
125:
126: if (FreeEntries != FifoSize) {
127: while (READ_REGISTER_UCHAR(&Jaguar->FifoUsedEntries.Byte) != 0) {
128: }
129: FreeEntries = FifoSize;
130: }
131: }
132: --*/
133:
134: LEAF_ENTRY(WaitForJaguarIdle)
135: lbu t2,FreeEntries // read free entries
136: li t3,FifoSize // if the number of FreeEntries is
137: beq t2,t3,10f // the FifoSize then it's empty
138: lw t0,Jaguar
139: Loop:
140: lbu t1,USED_ENTRIES(t0) // read used entries
141: bne t1,zero,Loop
142:
143: sb t3,FreeEntries // when we exit jaguar is idle -> we have
144: // FifoSize free entries
145: 10:
146: j ra
147: .end
148:
149: /*++
150: VOID
151: DevSetFgColor(
152: IN ULONG Color
153: )
154:
155:
156: Routine Description:
157:
158: This routine sets the Jaguar Foreground color register with the given
159: color. It first waits for the accelerator to be idle to ensure that
160: the color register is not changed while it's being used.
161:
162:
163: Arguments:
164:
165: Color.
166:
167: Return Value:
168:
169: None.
170:
171: {
172: if (FreeEntries != FifoSize) {
173: while (READ_REGISTER_UCHAR(&Jaguar->FifoUsedEntries.Byte) != 0) {
174: }
175: FreeEntries = FifoSize;
176: }
177: WRITE_REGISTER_ULONG(&Jaguar->ForegroundColor.Long,Color);
178: }
179: --*/
180:
181: LEAF_ENTRY(DevSetFgColor)
182: lbu t2,FreeEntries // read free entries
183: li t3,FifoSize // if the number of FreeEntries is
184: lw t0,Jaguar
185: beq t2,t3,10f // the FifoSize then it's empty
186:
187: LoopFg:
188: lbu t1,USED_ENTRIES(t0) // read used entries
189: bne t1,zero,LoopFg
190:
191: sb t3,FreeEntries // when we exit jaguar is idle -> we have
192: // FifoSize free entries
193: 10:
194: sw a0,FG_COLOR(t0) // write foreground color
195: j ra
196: .end
197:
198:
199:
200: /*++
201: VOID
202: DevSetBgColor(
203: IN ULONG Color
204: )
205:
206:
207: Routine Description:
208:
209: This routine sets the Jaguar Background color register with the given
210: color. The accelerator must be idle to ensure that the color register
211: is not changed while it's being used.
212:
213:
214: Arguments:
215:
216: Color.
217:
218: Return Value:
219:
220: None.
221:
222: {
223: if (FreeEntries != FifoSize) {
224: while (READ_REGISTER_UCHAR(&Jaguar->FifoUsedEntries.Byte) != 0) {
225: }
226: FreeEntries = FifoSize;
227: }
228: WRITE_REGISTER_ULONG(&Jaguar->BackgroundColor.Long,Color);
229: }
230: --*/
231:
232: LEAF_ENTRY(DevSetBgColor)
233: lbu t2,FreeEntries // read free entries
234: li t3,FifoSize // if the number of FreeEntries is
235: lw t0,Jaguar
236: beq t2,t3,10f // the FifoSize then it's empty
237:
238: LoopBg:
239: lbu t1,USED_ENTRIES(t0) // read used entries
240: bne t1,zero,LoopBg
241:
242: sb t3,FreeEntries // when we exit jaguar is idle -> we have
243: // FifoSize free entries
244: 10:
245: sw a0,BG_COLOR(t0) // write foreground color
246: j ra
247: .end
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