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[linux-2.6/next.git] / arch / ia64 / kernel / minstate.h
blobd56753a11636b723b402a32df60fc762af3c5e38
1
2 #include <asm/cache.h>
3
4 #include "entry.h"
5 #include "paravirt_inst.h"
6
7 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
8 /* read ar.itc in advance, and use it before leaving bank 0 */
9 #define ACCOUNT_GET_STAMP \
10 (pUStk) mov.m r20=ar.itc;
11 #define ACCOUNT_SYS_ENTER \
12 (pUStk) br.call.spnt rp=account_sys_enter \
13 ;;
14 #else
15 #define ACCOUNT_GET_STAMP
16 #define ACCOUNT_SYS_ENTER
17 #endif
18
19 .section ".data..patch.rse", "a"
20 .previous
21
22 /*
23 * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
24 * the minimum state necessary that allows us to turn psr.ic back
25 * on.
26 *
27 * Assumed state upon entry:
28 * psr.ic: off
29 * r31: contains saved predicates (pr)
30 *
31 * Upon exit, the state is as follows:
32 * psr.ic: off
33 * r2 = points to &pt_regs.r16
34 * r8 = contents of ar.ccv
35 * r9 = contents of ar.csd
36 * r10 = contents of ar.ssd
37 * r11 = FPSR_DEFAULT
38 * r12 = kernel sp (kernel virtual address)
39 * r13 = points to current task_struct (kernel virtual address)
40 * p15 = TRUE if psr.i is set in cr.ipsr
41 * predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
42 * preserved
43 *
44 * Note that psr.ic is NOT turned on by this macro. This is so that
45 * we can pass interruption state as arguments to a handler.
46 */
47 #define IA64_NATIVE_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND) \
48 mov r16=IA64_KR(CURRENT); /* M */ \
49 mov r27=ar.rsc; /* M */ \
50 mov r20=r1; /* A */ \
51 mov r25=ar.unat; /* M */ \
52 MOV_FROM_IPSR(p0,r29); /* M */ \
53 mov r26=ar.pfs; /* I */ \
54 MOV_FROM_IIP(r28); /* M */ \
55 mov r21=ar.fpsr; /* M */ \
56 __COVER; /* B;; (or nothing) */ \
57 ;; \
58 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16; \
59 ;; \
60 ld1 r17=[r16]; /* load current->thread.on_ustack flag */ \
61 st1 [r16]=r0; /* clear current->thread.on_ustack flag */ \
62 adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 \
63 /* switch from user to kernel RBS: */ \
64 ;; \
65 invala; /* M */ \
66 SAVE_IFS; \
67 cmp.eq pKStk,pUStk=r0,r17; /* are we in kernel mode already? */ \
68 ;; \
69 (pUStk) mov ar.rsc=0; /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \
70 ;; \
71 (pUStk) mov.m r24=ar.rnat; \
72 (pUStk) addl r22=IA64_RBS_OFFSET,r1; /* compute base of RBS */ \
73 (pKStk) mov r1=sp; /* get sp */ \
74 ;; \
75 (pUStk) lfetch.fault.excl.nt1 [r22]; \
76 (pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base of memory stack */ \
77 (pUStk) mov r23=ar.bspstore; /* save ar.bspstore */ \
78 ;; \
79 (pUStk) mov ar.bspstore=r22; /* switch to kernel RBS */ \
80 (pKStk) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode, use sp (r12) */ \
81 ;; \
82 (pUStk) mov r18=ar.bsp; \
83 (pUStk) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */ \
84 adds r17=2*L1_CACHE_BYTES,r1; /* really: biggest cache-line size */ \
85 adds r16=PT(CR_IPSR),r1; \
86 ;; \
87 lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES; \
88 st8 [r16]=r29; /* save cr.ipsr */ \
89 ;; \
90 lfetch.fault.excl.nt1 [r17]; \
91 tbit.nz p15,p0=r29,IA64_PSR_I_BIT; \
92 mov r29=b0 \
93 ;; \
94 WORKAROUND; \
95 adds r16=PT(R8),r1; /* initialize first base pointer */ \
96 adds r17=PT(R9),r1; /* initialize second base pointer */ \
97 (pKStk) mov r18=r0; /* make sure r18 isn't NaT */ \
98 ;; \
99 .mem.offset 0,0; st8.spill [r16]=r8,16; \
100 .mem.offset 8,0; st8.spill [r17]=r9,16; \
101 ;; \
102 .mem.offset 0,0; st8.spill [r16]=r10,24; \
103 .mem.offset 8,0; st8.spill [r17]=r11,24; \
104 ;; \
105 st8 [r16]=r28,16; /* save cr.iip */ \
106 st8 [r17]=r30,16; /* save cr.ifs */ \
107 (pUStk) sub r18=r18,r22; /* r18=RSE.ndirty*8 */ \
108 mov r8=ar.ccv; \
109 mov r9=ar.csd; \
110 mov r10=ar.ssd; \
111 movl r11=FPSR_DEFAULT; /* L-unit */ \
112 ;; \
113 st8 [r16]=r25,16; /* save ar.unat */ \
114 st8 [r17]=r26,16; /* save ar.pfs */ \
115 shl r18=r18,16; /* compute ar.rsc to be used for "loadrs" */ \
116 ;; \
117 st8 [r16]=r27,16; /* save ar.rsc */ \
118 (pUStk) st8 [r17]=r24,16; /* save ar.rnat */ \
119 (pKStk) adds r17=16,r17; /* skip over ar_rnat field */ \
120 ;; /* avoid RAW on r16 & r17 */ \
121 (pUStk) st8 [r16]=r23,16; /* save ar.bspstore */ \
122 st8 [r17]=r31,16; /* save predicates */ \
123 (pKStk) adds r16=16,r16; /* skip over ar_bspstore field */ \
124 ;; \
125 st8 [r16]=r29,16; /* save b0 */ \
126 st8 [r17]=r18,16; /* save ar.rsc value for "loadrs" */ \
127 cmp.eq pNonSys,pSys=r0,r0 /* initialize pSys=0, pNonSys=1 */ \
128 ;; \
129 .mem.offset 0,0; st8.spill [r16]=r20,16; /* save original r1 */ \
130 .mem.offset 8,0; st8.spill [r17]=r12,16; \
131 adds r12=-16,r1; /* switch to kernel memory stack (with 16 bytes of scratch) */ \
132 ;; \
133 .mem.offset 0,0; st8.spill [r16]=r13,16; \
134 .mem.offset 8,0; st8.spill [r17]=r21,16; /* save ar.fpsr */ \
135 mov r13=IA64_KR(CURRENT); /* establish `current' */ \
136 ;; \
137 .mem.offset 0,0; st8.spill [r16]=r15,16; \
138 .mem.offset 8,0; st8.spill [r17]=r14,16; \
139 ;; \
140 .mem.offset 0,0; st8.spill [r16]=r2,16; \
141 .mem.offset 8,0; st8.spill [r17]=r3,16; \
142 ACCOUNT_GET_STAMP \
143 adds r2=IA64_PT_REGS_R16_OFFSET,r1; \
144 ;; \
145 EXTRA; \
146 movl r1=__gp; /* establish kernel global pointer */ \
147 ;; \
148 ACCOUNT_SYS_ENTER \
149 bsw.1; /* switch back to bank 1 (must be last in insn group) */ \
150 ;;
151
152 /*
153 * SAVE_REST saves the remainder of pt_regs (with psr.ic on).
154 *
155 * Assumed state upon entry:
156 * psr.ic: on
157 * r2: points to &pt_regs.r16
158 * r3: points to &pt_regs.r17
159 * r8: contents of ar.ccv
160 * r9: contents of ar.csd
161 * r10: contents of ar.ssd
162 * r11: FPSR_DEFAULT
163 *
164 * Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
165 */
166 #define SAVE_REST \
167 .mem.offset 0,0; st8.spill [r2]=r16,16; \
168 .mem.offset 8,0; st8.spill [r3]=r17,16; \
169 ;; \
170 .mem.offset 0,0; st8.spill [r2]=r18,16; \
171 .mem.offset 8,0; st8.spill [r3]=r19,16; \
172 ;; \
173 .mem.offset 0,0; st8.spill [r2]=r20,16; \
174 .mem.offset 8,0; st8.spill [r3]=r21,16; \
175 mov r18=b6; \
176 ;; \
177 .mem.offset 0,0; st8.spill [r2]=r22,16; \
178 .mem.offset 8,0; st8.spill [r3]=r23,16; \
179 mov r19=b7; \
180 ;; \
181 .mem.offset 0,0; st8.spill [r2]=r24,16; \
182 .mem.offset 8,0; st8.spill [r3]=r25,16; \
183 ;; \
184 .mem.offset 0,0; st8.spill [r2]=r26,16; \
185 .mem.offset 8,0; st8.spill [r3]=r27,16; \
186 ;; \
187 .mem.offset 0,0; st8.spill [r2]=r28,16; \
188 .mem.offset 8,0; st8.spill [r3]=r29,16; \
189 ;; \
190 .mem.offset 0,0; st8.spill [r2]=r30,16; \
191 .mem.offset 8,0; st8.spill [r3]=r31,32; \
192 ;; \
193 mov ar.fpsr=r11; /* M-unit */ \
194 st8 [r2]=r8,8; /* ar.ccv */ \
195 adds r24=PT(B6)-PT(F7),r3; \
196 ;; \
197 stf.spill [r2]=f6,32; \
198 stf.spill [r3]=f7,32; \
199 ;; \
200 stf.spill [r2]=f8,32; \
201 stf.spill [r3]=f9,32; \
202 ;; \
203 stf.spill [r2]=f10; \
204 stf.spill [r3]=f11; \
205 adds r25=PT(B7)-PT(F11),r3; \
206 ;; \
207 st8 [r24]=r18,16; /* b6 */ \
208 st8 [r25]=r19,16; /* b7 */ \
209 ;; \
210 st8 [r24]=r9; /* ar.csd */ \
211 st8 [r25]=r10; /* ar.ssd */ \
212 ;;
213
214 #define RSE_WORKAROUND \
215 (pUStk) extr.u r17=r18,3,6; \
216 (pUStk) sub r16=r18,r22; \
217 [1:](pKStk) br.cond.sptk.many 1f; \
218 .xdata4 ".data..patch.rse",1b-. \
219 ;; \
220 cmp.ge p6,p7 = 33,r17; \
221 ;; \
222 (p6) mov r17=0x310; \
223 (p7) mov r17=0x308; \
224 ;; \
225 cmp.leu p1,p0=r16,r17; \
226 (p1) br.cond.sptk.many 1f; \
227 dep.z r17=r26,0,62; \
228 movl r16=2f; \
229 ;; \
230 mov ar.pfs=r17; \
231 dep r27=r0,r27,16,14; \
232 mov b0=r16; \
233 ;; \
234 br.ret.sptk b0; \
235 ;; \
236 2: \
237 mov ar.rsc=r0 \
238 ;; \
239 flushrs; \
240 ;; \
241 mov ar.bspstore=r22 \
242 ;; \
243 mov r18=ar.bsp; \
244 ;; \
245 1: \
246 .pred.rel "mutex", pKStk, pUStk
247
248 #define SAVE_MIN_WITH_COVER DO_SAVE_MIN(COVER, mov r30=cr.ifs, , RSE_WORKAROUND)
249 #define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(COVER, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
250 #define SAVE_MIN DO_SAVE_MIN( , mov r30=r0, , )
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