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gerrit.cesnet.cz / github / trini / u-boot / 3b5df50ec02efbef84cff05d279bd734c020996f / . / include / bedbug / regs.h
blob: eb746912bf149333a245e1668f5185add0b50e8c [file] [log] [blame]
wdenk012771d2002-03-08 21:31:05 +0000[diff] [blame]1/* $Id$ */
2
3#ifndef _REGS_H
4#define _REGS_H
5
6/* Special Purpose Registers */
7
8#define SPR_CR -1
9#define SPR_MSR -2
10
11#define SPR_XER 1
12#define SPR_LR 8
13#define SPR_CTR 9
14#define SPR_DSISR 18
15#define SPR_DAR 19
16#define SPR_DEC 22
17#define SPR_SRR0 26
18#define SPR_SRR1 27
19#define SPR_EIE 80
20#define SPR_EID 81
21#define SPR_CMPA 144
22#define SPR_CMPB 145
23#define SPR_CMPC 146
24#define SPR_CMPD 147
25#define SPR_ICR 148
26#define SPR_DER 149
27#define SPR_COUNTA 150
28#define SPR_COUNTB 151
29#define SPR_CMPE 152
30#define SPR_CMPF 153
31#define SPR_CMPG 154
32#define SPR_CMPH 155
33#define SPR_LCTRL1 156
34#define SPR_LCTRL2 157
35#define SPR_ICTRL 158
36#define SPR_BAR 159
37#define SPR_USPRG0 256
38#define SPR_SPRG4_RO 260
39#define SPR_SPRG5_RO 261
40#define SPR_SPRG6_RO 262
41#define SPR_SPRG7_RO 263
42#define SPR_SPRG0 272
43#define SPR_SPRG1 273
44#define SPR_SPRG2 274
45#define SPR_SPRG3 275
46#define SPR_SPRG4 276
47#define SPR_SPRG5 277
48#define SPR_SPRG6 278
49#define SPR_SPRG7 279
50#define SPR_EAR 282 /* MPC603e core */
51#define SPR_TBL 284
52#define SPR_TBU 285
53#define SPR_PVR 287
54#define SPR_IC_CST 560
55#define SPR_IC_ADR 561
56#define SPR_IC_DAT 562
57#define SPR_DC_CST 568
58#define SPR_DC_ADR 569
59#define SPR_DC_DAT 570
60#define SPR_DPDR 630
61#define SPR_IMMR 638
62#define SPR_MI_CTR 784
63#define SPR_MI_AP 786
64#define SPR_MI_EPN 787
65#define SPR_MI_TWC 789
66#define SPR_MI_RPN 790
67#define SPR_MD_CTR 792
68#define SPR_M_CASID 793
69#define SPR_MD_AP 794
70#define SPR_MD_EPN 795
71#define SPR_M_TWB 796
72#define SPR_MD_TWC 797
73#define SPR_MD_RPN 798
74#define SPR_M_TW 799
75#define SPR_MI_DBCAM 816
76#define SPR_MI_DBRAM0 817
77#define SPR_MI_DBRAM1 818
78#define SPR_MD_DBCAM 824
79#define SPR_MD_DBRAM0 825
80#define SPR_MD_DBRAM1 826
81#define SPR_ZPR 944
82#define SPR_PID 945
83#define SPR_CCR0 947
84#define SPR_IAC3 948
85#define SPR_IAC4 949
86#define SPR_DVC1 950
87#define SPR_DVC2 951
88#define SPR_SGR 953
89#define SPR_DCWR 954
90#define SPR_SLER 955
91#define SPR_SU0R 956
92#define SPR_DBCR1 957
93#define SPR_ICDBDR 979
94#define SPR_ESR 980
95#define SPR_DEAR 981
96#define SPR_EVPR 982
97#define SPR_TSR 984
98#define SPR_TCR 986
99#define SPR_PIT 987
100#define SPR_SRR2 990
101#define SPR_SRR3 991
102#define SPR_DBSR 1008
103#define SPR_DBCR0 1010
104#define SPR_IABR 1010 /* MPC603e core */
105#define SPR_IAC1 1012
106#define SPR_IAC2 1013
107#define SPR_DAC1 1014
108#define SPR_DAC2 1015
109#define SPR_DCCR 1018
110#define SPR_ICCR 1019
111
112/* Bits for the DBCR0 register */
113#define DBCR0_EDM 0x80000000
114#define DBCR0_IDM 0x40000000
115#define DBCR0_RST 0x30000000
116#define DBCR0_IC 0x08000000
117#define DBCR0_BT 0x04000000
118#define DBCR0_EDE 0x02000000
119#define DBCR0_TDE 0x01000000
120#define DBCR0_IA1 0x00800000
121#define DBCR0_IA2 0x00400000
122#define DBCR0_IA12 0x00200000
123#define DBCR0_IA12X 0x00100000
124#define DBCR0_IA3 0x00080000
125#define DBCR0_IA4 0x00040000
126#define DBCR0_IA34 0x00020000
127#define DBCR0_IA34X 0x00010000
128#define DBCR0_IA12T 0x00008000
129#define DBCR0_IA34T 0x00004000
130#define DBCR0_FT 0x00000001
131
132/* Bits for the DBCR1 register */
133#define DBCR1_D1R 0x80000000
134#define DBCR1_D2R 0x40000000
135#define DBCR1_D1W 0x20000000
136#define DBCR1_D2W 0x10000000
137#define DBCR1_D1S 0x0C000000
138#define DBCR1_D2S 0x03000000
139#define DBCR1_DA12 0x00800000
140#define DBCR1_DA12X 0x00400000
141#define DBCR1_DV1M 0x000C0000
142#define DBCR1_DV2M 0x00030000
143#define DBCR1_DV1BE 0x0000F000
144#define DBCR1_DV2BE 0x00000F00
145
Stefan Roese4b0a03d2011-10-07 01:05:49 +0000[diff] [blame]146/*
147 * DBSR bits which have conflicting definitions on true Book E versus PPC40x
148 */
149#ifdef CONFIG_BOOKE
150#define DBSR_IA1 0x00800000 /* Instr Address Compare 1 Event */
151#define DBSR_IA2 0x00400000 /* Instr Address Compare 2 Event */
152#define DBSR_IA3 0x00200000 /* Instr Address Compare 3 Event */
153#define DBSR_IA4 0x00100000 /* Instr Address Compare 4 Event */
154#endif
155#ifndef CONFIG_440
156#define DBSR_IA1 0x04000000 /* Instr Address Compare 1 Event */
157#define DBSR_IA2 0x02000000 /* Instr Address Compare 2 Event */
158#define DBSR_IA3 0x00080000 /* Instr Address Compare 3 Event */
159#define DBSR_IA4 0x00040000 /* Instr Address Compare 4 Event */
160#endif
wdenk012771d2002-03-08 21:31:05 +0000[diff] [blame]161
162struct spr_info {
163 int spr_val;
164 char spr_name[ 10 ];
165};
166
167extern struct spr_info spr_map[];
168extern const unsigned int n_sprs;
169
170
171#define SET_REGISTER( str, val ) \
172({ unsigned long __value = (val); \
173 asm volatile( str : : "r" (__value)); \
174 __value; })
175
176#define GET_REGISTER( str ) \
177({ unsigned long __value; \
178 asm volatile( str : "=r" (__value) : ); \
179 __value; })
180
181#define GET_CR() GET_REGISTER( "mfcr %0" )
182#define SET_CR(val) SET_REGISTER( "mtcr %0", val )
183#define GET_MSR() GET_REGISTER( "mfmsr %0" )
184#define SET_MSR(val) SET_REGISTER( "mtmsr %0", val )
185#define GET_XER() GET_REGISTER( "mfspr %0,1" )
186#define SET_XER(val) SET_REGISTER( "mtspr 1,%0", val )
187#define GET_LR() GET_REGISTER( "mfspr %0,8" )
188#define SET_LR(val) SET_REGISTER( "mtspr 8,%0", val )
189#define GET_CTR() GET_REGISTER( "mfspr %0,9" )
190#define SET_CTR(val) SET_REGISTER( "mtspr 9,%0", val )
191#define GET_DSISR() GET_REGISTER( "mfspr %0,18" )
192#define SET_DSISR(val) SET_REGISTER( "mtspr 18,%0", val )
193#define GET_DAR() GET_REGISTER( "mfspr %0,19" )
194#define SET_DAR(val) SET_REGISTER( "mtspr 19,%0", val )
195#define GET_DEC() GET_REGISTER( "mfspr %0,22" )
196#define SET_DEC(val) SET_REGISTER( "mtspr 22,%0", val )
197#define GET_SRR0() GET_REGISTER( "mfspr %0,26" )
198#define SET_SRR0(val) SET_REGISTER( "mtspr 26,%0", val )
199#define GET_SRR1() GET_REGISTER( "mfspr %0,27" )
200#define SET_SRR1(val) SET_REGISTER( "mtspr 27,%0", val )
201#define GET_EIE() GET_REGISTER( "mfspr %0,80" )
202#define SET_EIE(val) SET_REGISTER( "mtspr 80,%0", val )
203#define GET_EID() GET_REGISTER( "mfspr %0,81" )
204#define SET_EID(val) SET_REGISTER( "mtspr 81,%0", val )
205#define GET_CMPA() GET_REGISTER( "mfspr %0,144" )
206#define SET_CMPA(val) SET_REGISTER( "mtspr 144,%0", val )
207#define GET_CMPB() GET_REGISTER( "mfspr %0,145" )
208#define SET_CMPB(val) SET_REGISTER( "mtspr 145,%0", val )
209#define GET_CMPC() GET_REGISTER( "mfspr %0,146" )
210#define SET_CMPC(val) SET_REGISTER( "mtspr 146,%0", val )
211#define GET_CMPD() GET_REGISTER( "mfspr %0,147" )
212#define SET_CMPD(val) SET_REGISTER( "mtspr 147,%0", val )
213#define GET_ICR() GET_REGISTER( "mfspr %0,148" )
214#define SET_ICR(val) SET_REGISTER( "mtspr 148,%0", val )
215#define GET_DER() GET_REGISTER( "mfspr %0,149" )
216#define SET_DER(val) SET_REGISTER( "mtspr 149,%0", val )
217#define GET_COUNTA() GET_REGISTER( "mfspr %0,150" )
218#define SET_COUNTA(val) SET_REGISTER( "mtspr 150,%0", val )
219#define GET_COUNTB() GET_REGISTER( "mfspr %0,151" )
220#define SET_COUNTB(val) SET_REGISTER( "mtspr 151,%0", val )
221#define GET_CMPE() GET_REGISTER( "mfspr %0,152" )
222#define SET_CMPE(val) SET_REGISTER( "mtspr 152,%0", val )
223#define GET_CMPF() GET_REGISTER( "mfspr %0,153" )
224#define SET_CMPF(val) SET_REGISTER( "mtspr 153,%0", val )
225#define GET_CMPG() GET_REGISTER( "mfspr %0,154" )
226#define SET_CMPG(val) SET_REGISTER( "mtspr 154,%0", val )
227#define GET_CMPH() GET_REGISTER( "mfspr %0,155" )
228#define SET_CMPH(val) SET_REGISTER( "mtspr 155,%0", val )
229#define GET_LCTRL1() GET_REGISTER( "mfspr %0,156" )
230#define SET_LCTRL1(val) SET_REGISTER( "mtspr 156,%0", val )
231#define GET_LCTRL2() GET_REGISTER( "mfspr %0,157" )
232#define SET_LCTRL2(val) SET_REGISTER( "mtspr 157,%0", val )
233#define GET_ICTRL() GET_REGISTER( "mfspr %0,158" )
234#define SET_ICTRL(val) SET_REGISTER( "mtspr 158,%0", val )
235#define GET_BAR() GET_REGISTER( "mfspr %0,159" )
236#define SET_BAR(val) SET_REGISTER( "mtspr 159,%0", val )
237#define GET_USPRG0() GET_REGISTER( "mfspr %0,256" )
238#define SET_USPRG0(val) SET_REGISTER( "mtspr 256,%0", val )
239#define GET_SPRG4_RO() GET_REGISTER( "mfspr %0,260" )
240#define SET_SPRG4_RO(val) SET_REGISTER( "mtspr 260,%0", val )
241#define GET_SPRG5_RO() GET_REGISTER( "mfspr %0,261" )
242#define SET_SPRG5_RO(val) SET_REGISTER( "mtspr 261,%0", val )
243#define GET_SPRG6_RO() GET_REGISTER( "mfspr %0,262" )
244#define SET_SPRG6_RO(val) SET_REGISTER( "mtspr 262,%0", val )
245#define GET_SPRG7_RO() GET_REGISTER( "mfspr %0,263" )
246#define SET_SPRG7_RO(val) SET_REGISTER( "mtspr 263,%0", val )
247#define GET_SPRG0() GET_REGISTER( "mfspr %0,272" )
248#define SET_SPRG0(val) SET_REGISTER( "mtspr 272,%0", val )
249#define GET_SPRG1() GET_REGISTER( "mfspr %0,273" )
250#define SET_SPRG1(val) SET_REGISTER( "mtspr 273,%0", val )
251#define GET_SPRG2() GET_REGISTER( "mfspr %0,274" )
252#define SET_SPRG2(val) SET_REGISTER( "mtspr 274,%0", val )
253#define GET_SPRG3() GET_REGISTER( "mfspr %0,275" )
254#define SET_SPRG3(val) SET_REGISTER( "mtspr 275,%0", val )
255#define GET_SPRG4() GET_REGISTER( "mfspr %0,276" )
256#define SET_SPRG4(val) SET_REGISTER( "mtspr 276,%0", val )
257#define GET_SPRG5() GET_REGISTER( "mfspr %0,277" )
258#define SET_SPRG5(val) SET_REGISTER( "mtspr 277,%0", val )
259#define GET_SPRG6() GET_REGISTER( "mfspr %0,278" )
260#define SET_SPRG6(val) SET_REGISTER( "mtspr 278,%0", val )
261#define GET_SPRG7() GET_REGISTER( "mfspr %0,279" )
262#define SET_SPRG7(val) SET_REGISTER( "mtspr 279,%0", val )
263#define GET_EAR() GET_REGISTER( "mfspr %0,282" )
264#define SET_EAR(val) SET_REGISTER( "mtspr 282,%0", val )
265#define GET_TBL() GET_REGISTER( "mfspr %0,284" )
266#define SET_TBL(val) SET_REGISTER( "mtspr 284,%0", val )
267#define GET_TBU() GET_REGISTER( "mfspr %0,285" )
268#define SET_TBU(val) SET_REGISTER( "mtspr 285,%0", val )
269#define GET_PVR() GET_REGISTER( "mfspr %0,287" )
270#define SET_PVR(val) SET_REGISTER( "mtspr 287,%0", val )
271#define GET_IC_CST() GET_REGISTER( "mfspr %0,560" )
272#define SET_IC_CST(val) SET_REGISTER( "mtspr 560,%0", val )
273#define GET_IC_ADR() GET_REGISTER( "mfspr %0,561" )
274#define SET_IC_ADR(val) SET_REGISTER( "mtspr 561,%0", val )
275#define GET_IC_DAT() GET_REGISTER( "mfspr %0,562" )
276#define SET_IC_DAT(val) SET_REGISTER( "mtspr 562,%0", val )
277#define GET_DC_CST() GET_REGISTER( "mfspr %0,568" )
278#define SET_DC_CST(val) SET_REGISTER( "mtspr 568,%0", val )
279#define GET_DC_ADR() GET_REGISTER( "mfspr %0,569" )
280#define SET_DC_ADR(val) SET_REGISTER( "mtspr 569,%0", val )
281#define GET_DC_DAT() GET_REGISTER( "mfspr %0,570" )
282#define SET_DC_DAT(val) SET_REGISTER( "mtspr 570,%0", val )
283#define GET_DPDR() GET_REGISTER( "mfspr %0,630" )
284#define SET_DPDR(val) SET_REGISTER( "mtspr 630,%0", val )
285#define GET_IMMR() GET_REGISTER( "mfspr %0,638" )
286#define SET_IMMR(val) SET_REGISTER( "mtspr 638,%0", val )
287#define GET_MI_CTR() GET_REGISTER( "mfspr %0,784" )
288#define SET_MI_CTR(val) SET_REGISTER( "mtspr 784,%0", val )
289#define GET_MI_AP() GET_REGISTER( "mfspr %0,786" )
290#define SET_MI_AP(val) SET_REGISTER( "mtspr 786,%0", val )
291#define GET_MI_EPN() GET_REGISTER( "mfspr %0,787" )
292#define SET_MI_EPN(val) SET_REGISTER( "mtspr 787,%0", val )
293#define GET_MI_TWC() GET_REGISTER( "mfspr %0,789" )
294#define SET_MI_TWC(val) SET_REGISTER( "mtspr 789,%0", val )
295#define GET_MI_RPN() GET_REGISTER( "mfspr %0,790" )
296#define SET_MI_RPN(val) SET_REGISTER( "mtspr 790,%0", val )
297#define GET_MD_CTR() GET_REGISTER( "mfspr %0,792" )
298#define SET_MD_CTR(val) SET_REGISTER( "mtspr 792,%0", val )
299#define GET_M_CASID() GET_REGISTER( "mfspr %0,793" )
300#define SET_M_CASID(val) SET_REGISTER( "mtspr 793,%0", val )
301#define GET_MD_AP() GET_REGISTER( "mfspr %0,794" )
302#define SET_MD_AP(val) SET_REGISTER( "mtspr ,794%0", val )
303#define GET_MD_EPN() GET_REGISTER( "mfspr %0,795" )
304#define SET_MD_EPN(val) SET_REGISTER( "mtspr 795,%0", val )
305#define GET_M_TWB() GET_REGISTER( "mfspr %0,796" )
306#define SET_M_TWB(val) SET_REGISTER( "mtspr 796,%0", val )
307#define GET_MD_TWC() GET_REGISTER( "mfspr %0,797" )
308#define SET_MD_TWC(val) SET_REGISTER( "mtspr 797,%0", val )
309#define GET_MD_RPN() GET_REGISTER( "mfspr %0,798" )
310#define SET_MD_RPN(val) SET_REGISTER( "mtspr 798,%0", val )
311#define GET_M_TW() GET_REGISTER( "mfspr %0,799" )
312#define SET_M_TW(val) SET_REGISTER( "mtspr 799,%0", val )
313#define GET_MI_DBCAM() GET_REGISTER( "mfspr %0,816" )
314#define SET_MI_DBCAM(val) SET_REGISTER( "mtspr 816,%0", val )
315#define GET_MI_DBRAM0() GET_REGISTER( "mfspr %0,817" )
316#define SET_MI_DBRAM0(val) SET_REGISTER( "mtspr 817,%0", val )
317#define GET_MI_DBRAM1() GET_REGISTER( "mfspr %0,818" )
318#define SET_MI_DBRAM1(val) SET_REGISTER( "mtspr 818,%0", val )
319#define GET_MD_DBCAM() GET_REGISTER( "mfspr %0,824" )
320#define SET_MD_DBCA(val) SET_REGISTER( "mtspr 824,%0", val )
321#define GET_MD_DBRAM0() GET_REGISTER( "mfspr %0,825" )
322#define SET_MD_DBRAM0(val) SET_REGISTER( "mtspr 825,%0", val )
323#define GET_MD_DBRAM1() GET_REGISTER( "mfspr %0,826" )
324#define SET_MD_DBRAM1(val) SET_REGISTER( "mtspr 826,%0", val )
325#define GET_ZPR() GET_REGISTER( "mfspr %0,944" )
326#define SET_ZPR(val) SET_REGISTER( "mtspr 944,%0", val )
327#define GET_PID() GET_REGISTER( "mfspr %0,945" )
328#define SET_PID(val) SET_REGISTER( "mtspr 945,%0", val )
329#define GET_CCR0() GET_REGISTER( "mfspr %0,947" )
330#define SET_CCR0(val) SET_REGISTER( "mtspr 947,%0", val )
331#define GET_IAC3() GET_REGISTER( "mfspr %0,948" )
332#define SET_IAC3(val) SET_REGISTER( "mtspr 948,%0", val )
333#define GET_IAC4() GET_REGISTER( "mfspr %0,949" )
334#define SET_IAC4(val) SET_REGISTER( "mtspr 949,%0", val )
335#define GET_DVC1() GET_REGISTER( "mfspr %0,950" )
336#define SET_DVC1(val) SET_REGISTER( "mtspr 950,%0", val )
337#define GET_DVC2() GET_REGISTER( "mfspr %0,951" )
338#define SET_DVC2(val) SET_REGISTER( "mtspr 951,%0", val )
339#define GET_SGR() GET_REGISTER( "mfspr %0,953" )
340#define SET_SGR(val) SET_REGISTER( "mtspr 953,%0", val )
341#define GET_DCWR() GET_REGISTER( "mfspr %0,954" )
342#define SET_DCWR(val) SET_REGISTER( "mtspr 954,%0", val )
343#define GET_SLER() GET_REGISTER( "mfspr %0,955" )
344#define SET_SLER(val) SET_REGISTER( "mtspr 955,%0", val )
345#define GET_SU0R() GET_REGISTER( "mfspr %0,956" )
346#define SET_SU0R(val) SET_REGISTER( "mtspr 956,%0", val )
347#define GET_DBCR1() GET_REGISTER( "mfspr %0,957" )
348#define SET_DBCR1(val) SET_REGISTER( "mtspr 957,%0", val )
349#define GET_ICDBDR() GET_REGISTER( "mfspr %0,979" )
350#define SET_ICDBDR(val) SET_REGISTER( "mtspr 979,%0", val )
351#define GET_ESR() GET_REGISTER( "mfspr %0,980" )
352#define SET_ESR(val) SET_REGISTER( "mtspr 980,%0", val )
353#define GET_DEAR() GET_REGISTER( "mfspr %0,981" )
354#define SET_DEAR(val) SET_REGISTER( "mtspr 981,%0", val )
355#define GET_EVPR() GET_REGISTER( "mfspr %0,982" )
356#define SET_EVPR(val) SET_REGISTER( "mtspr 982,%0", val )
357#define GET_TSR() GET_REGISTER( "mfspr %0,984" )
358#define SET_TSR(val) SET_REGISTER( "mtspr 984,%0", val )
359#define GET_TCR() GET_REGISTER( "mfspr %0,986" )
360#define SET_TCR(val) SET_REGISTER( "mtspr 986,%0", val )
361#define GET_PIT() GET_REGISTER( "mfspr %0,987" )
362#define SET_PIT(val) SET_REGISTER( "mtspr 987,%0", val )
363#define GET_SRR2() GET_REGISTER( "mfspr %0,990" )
364#define SET_SRR2(val) SET_REGISTER( "mtspr 990,%0", val )
365#define GET_SRR3() GET_REGISTER( "mfspr %0,991" )
366#define SET_SRR3(val) SET_REGISTER( "mtspr 991,%0", val )
367#define GET_DBSR() GET_REGISTER( "mfspr %0,1008" )
368#define SET_DBSR(val) SET_REGISTER( "mtspr 1008,%0", val )
369#define GET_DBCR0() GET_REGISTER( "mfspr %0,1010" )
370#define SET_DBCR0(val) SET_REGISTER( "mtspr 1010,%0", val )
371#define GET_IABR() GET_REGISTER( "mfspr %0,1010" )
372#define SET_IABR(val) SET_REGISTER( "mtspr 1010,%0", val )
373#define GET_IAC1() GET_REGISTER( "mfspr %0,1012" )
374#define SET_IAC1(val) SET_REGISTER( "mtspr 1012,%0", val )
375#define GET_IAC2() GET_REGISTER( "mfspr %0,1013" )
376#define SET_IAC2(val) SET_REGISTER( "mtspr 1013,%0", val )
377#define GET_DAC1() GET_REGISTER( "mfspr %0,1014" )
378#define SET_DAC1(val) SET_REGISTER( "mtspr 1014,%0", val )
379#define GET_DAC2() GET_REGISTER( "mfspr %0,1015" )
380#define SET_DAC2(val) SET_REGISTER( "mtspr 1015,%0", val )
381#define GET_DCCR() GET_REGISTER( "mfspr %0,1018" )
382#define SET_DCCR(val) SET_REGISTER( "mtspr 1018,%0", val )
383#define GET_ICCR() GET_REGISTER( "mfspr %0,1019" )
384#define SET_ICCR(val) SET_REGISTER( "mtspr 1019,%0", val )
385
386#endif /* _REGS_H */
387
388
389/*
390 * Copyright (c) 2000 William L. Pitts and W. Gerald Hicks
391 * All rights reserved.
392 *
393 * Redistribution and use in source and binary forms are freely
394 * permitted provided that the above copyright notice and this
395 * paragraph and the following disclaimer are duplicated in all
396 * such forms.
397 *
398 * This software is provided "AS IS" and without any express or
399 * implied warranties, including, without limitation, the implied
400 * warranties of merchantability and fitness for a particular
401 * purpose.
402 */