xref: /openbmc/qemu/target/sparc/int64_helper.c (revision 2e1cacfb)
1 /*
2  * Sparc64 interrupt helpers
3  *
4  *  Copyright (c) 2003-2005 Fabrice Bellard
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "qemu/main-loop.h"
22 #include "cpu.h"
23 #include "exec/helper-proto.h"
24 #include "exec/log.h"
25 #include "trace.h"
26 
27 #define DEBUG_PCALL
28 
29 #ifdef DEBUG_PCALL
30 static const char * const excp_names[0x80] = {
31     [TT_TFAULT] = "Instruction Access Fault",
32     [TT_TMISS] = "Instruction Access MMU Miss",
33     [TT_CODE_ACCESS] = "Instruction Access Error",
34     [TT_ILL_INSN] = "Illegal Instruction",
35     [TT_PRIV_INSN] = "Privileged Instruction",
36     [TT_NFPU_INSN] = "FPU Disabled",
37     [TT_FP_EXCP] = "FPU Exception",
38     [TT_TOVF] = "Tag Overflow",
39     [TT_CLRWIN] = "Clean Windows",
40     [TT_DIV_ZERO] = "Division By Zero",
41     [TT_DFAULT] = "Data Access Fault",
42     [TT_DMISS] = "Data Access MMU Miss",
43     [TT_DATA_ACCESS] = "Data Access Error",
44     [TT_DPROT] = "Data Protection Error",
45     [TT_UNALIGNED] = "Unaligned Memory Access",
46     [TT_PRIV_ACT] = "Privileged Action",
47     [TT_EXTINT | 0x1] = "External Interrupt 1",
48     [TT_EXTINT | 0x2] = "External Interrupt 2",
49     [TT_EXTINT | 0x3] = "External Interrupt 3",
50     [TT_EXTINT | 0x4] = "External Interrupt 4",
51     [TT_EXTINT | 0x5] = "External Interrupt 5",
52     [TT_EXTINT | 0x6] = "External Interrupt 6",
53     [TT_EXTINT | 0x7] = "External Interrupt 7",
54     [TT_EXTINT | 0x8] = "External Interrupt 8",
55     [TT_EXTINT | 0x9] = "External Interrupt 9",
56     [TT_EXTINT | 0xa] = "External Interrupt 10",
57     [TT_EXTINT | 0xb] = "External Interrupt 11",
58     [TT_EXTINT | 0xc] = "External Interrupt 12",
59     [TT_EXTINT | 0xd] = "External Interrupt 13",
60     [TT_EXTINT | 0xe] = "External Interrupt 14",
61     [TT_EXTINT | 0xf] = "External Interrupt 15",
62 };
63 #endif
64 
65 void cpu_check_irqs(CPUSPARCState *env)
66 {
67     CPUState *cs;
68     uint32_t pil = env->pil_in |
69                   (env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
70 
71     /* We should be holding the BQL before we mess with IRQs */
72     g_assert(bql_locked());
73 
74     /* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
75     if (env->ivec_status & 0x20) {
76         return;
77     }
78     cs = env_cpu(env);
79     /*
80      * check if TM or SM in SOFTINT are set
81      * setting these also causes interrupt 14
82      */
83     if (env->softint & (SOFTINT_TIMER | SOFTINT_STIMER)) {
84         pil |= 1 << 14;
85     }
86 
87     /*
88      * The bit corresponding to psrpil is (1<< psrpil),
89      * the next bit is (2 << psrpil).
90      */
91     if (pil < (2 << env->psrpil)) {
92         if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
93             trace_sparc64_cpu_check_irqs_reset_irq(env->interrupt_index);
94             env->interrupt_index = 0;
95             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
96         }
97         return;
98     }
99 
100     if (cpu_interrupts_enabled(env)) {
101 
102         unsigned int i;
103 
104         for (i = 15; i > env->psrpil; i--) {
105             if (pil & (1 << i)) {
106                 int old_interrupt = env->interrupt_index;
107                 int new_interrupt = TT_EXTINT | i;
108 
109                 if (unlikely(env->tl > 0 && cpu_tsptr(env)->tt > new_interrupt
110                   && ((cpu_tsptr(env)->tt & 0x1f0) == TT_EXTINT))) {
111                     trace_sparc64_cpu_check_irqs_noset_irq(env->tl,
112                                                       cpu_tsptr(env)->tt,
113                                                       new_interrupt);
114                 } else if (old_interrupt != new_interrupt) {
115                     env->interrupt_index = new_interrupt;
116                     trace_sparc64_cpu_check_irqs_set_irq(i, old_interrupt,
117                                                          new_interrupt);
118                     cpu_interrupt(cs, CPU_INTERRUPT_HARD);
119                 }
120                 break;
121             }
122         }
123     } else if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
124         trace_sparc64_cpu_check_irqs_disabled(pil, env->pil_in, env->softint,
125                                               env->interrupt_index);
126         env->interrupt_index = 0;
127         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
128     }
129 }
130 
131 void sparc_cpu_do_interrupt(CPUState *cs)
132 {
133     CPUSPARCState *env = cpu_env(cs);
134     int intno = cs->exception_index;
135     trap_state *tsptr;
136 
137 #ifdef DEBUG_PCALL
138     if (qemu_loglevel_mask(CPU_LOG_INT)) {
139         static int count;
140         const char *name;
141 
142         if (intno < 0 || intno >= 0x1ff) {
143             name = "Unknown";
144         } else if (intno >= 0x180) {
145             name = "Hyperprivileged Trap Instruction";
146         } else if (intno >= 0x100) {
147             name = "Trap Instruction";
148         } else if (intno >= 0xc0) {
149             name = "Window Fill";
150         } else if (intno >= 0x80) {
151             name = "Window Spill";
152         } else {
153             name = excp_names[intno];
154             if (!name) {
155                 name = "Unknown";
156             }
157         }
158 
159         qemu_log("%6d: %s (v=%04x)\n", count, name, intno);
160         log_cpu_state(cs, 0);
161 #if 0
162         {
163             int i;
164             uint8_t *ptr;
165 
166             qemu_log("       code=");
167             ptr = (uint8_t *)env->pc;
168             for (i = 0; i < 16; i++) {
169                 qemu_log(" %02x", ldub(ptr + i));
170             }
171             qemu_log("\n");
172         }
173 #endif
174         count++;
175     }
176 #endif
177 #if !defined(CONFIG_USER_ONLY)
178     if (env->tl >= env->maxtl) {
179         cpu_abort(cs, "Trap 0x%04x while trap level (%d) >= MAXTL (%d),"
180                   " Error state", cs->exception_index, env->tl, env->maxtl);
181         return;
182     }
183 #endif
184     if (env->tl < env->maxtl - 1) {
185         env->tl++;
186     } else {
187         env->pstate |= PS_RED;
188         if (env->tl < env->maxtl) {
189             env->tl++;
190         }
191     }
192     tsptr = cpu_tsptr(env);
193 
194     tsptr->tstate = sparc64_tstate(env);
195     tsptr->tpc = env->pc;
196     tsptr->tnpc = env->npc;
197     tsptr->tt = intno;
198 
199     if (cpu_has_hypervisor(env)) {
200         env->htstate[env->tl] = env->hpstate;
201         /* XXX OpenSPARC T1 - UltraSPARC T3 have MAXPTL=2
202            but this may change in the future */
203         if (env->tl > 2) {
204             env->hpstate |= HS_PRIV;
205         }
206     }
207 
208     if (env->def.features & CPU_FEATURE_GL) {
209         cpu_gl_switch_gregs(env, env->gl + 1);
210         env->gl++;
211     }
212 
213     switch (intno) {
214     case TT_IVEC:
215         if (!cpu_has_hypervisor(env)) {
216             cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_IG);
217         }
218         break;
219     case TT_TFAULT:
220     case TT_DFAULT:
221     case TT_TMISS ... TT_TMISS + 3:
222     case TT_DMISS ... TT_DMISS + 3:
223     case TT_DPROT ... TT_DPROT + 3:
224         if (cpu_has_hypervisor(env)) {
225             env->hpstate |= HS_PRIV;
226             env->pstate = PS_PEF | PS_PRIV;
227         } else {
228             cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_MG);
229         }
230         break;
231     case TT_INSN_REAL_TRANSLATION_MISS ... TT_DATA_REAL_TRANSLATION_MISS:
232     case TT_HTRAP ... TT_HTRAP + 127:
233         env->hpstate |= HS_PRIV;
234         break;
235     default:
236         cpu_change_pstate(env, PS_PEF | PS_PRIV | PS_AG);
237         break;
238     }
239 
240     if (intno == TT_CLRWIN) {
241         cpu_set_cwp(env, cpu_cwp_dec(env, env->cwp - 1));
242     } else if ((intno & 0x1c0) == TT_SPILL) {
243         cpu_set_cwp(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
244     } else if ((intno & 0x1c0) == TT_FILL) {
245         cpu_set_cwp(env, cpu_cwp_inc(env, env->cwp + 1));
246     }
247 
248     if (cpu_hypervisor_mode(env)) {
249         env->pc = (env->htba & ~0x3fffULL) | (intno << 5);
250     } else {
251         env->pc = env->tbr  & ~0x7fffULL;
252         env->pc |= ((env->tl > 1) ? 1 << 14 : 0) | (intno << 5);
253     }
254     env->npc = env->pc + 4;
255     cs->exception_index = -1;
256 }
257 
258 trap_state *cpu_tsptr(CPUSPARCState* env)
259 {
260     return &env->ts[env->tl & MAXTL_MASK];
261 }
262 
263 static bool do_modify_softint(CPUSPARCState *env, uint32_t value)
264 {
265     if (env->softint != value) {
266         env->softint = value;
267 #if !defined(CONFIG_USER_ONLY)
268         if (cpu_interrupts_enabled(env)) {
269             bql_lock();
270             cpu_check_irqs(env);
271             bql_unlock();
272         }
273 #endif
274         return true;
275     }
276     return false;
277 }
278 
279 void helper_set_softint(CPUSPARCState *env, uint64_t value)
280 {
281     if (do_modify_softint(env, env->softint | (uint32_t)value)) {
282         trace_int_helper_set_softint(env->softint);
283     }
284 }
285 
286 void helper_clear_softint(CPUSPARCState *env, uint64_t value)
287 {
288     if (do_modify_softint(env, env->softint & (uint32_t)~value)) {
289         trace_int_helper_clear_softint(env->softint);
290     }
291 }
292 
293 void helper_write_softint(CPUSPARCState *env, uint64_t value)
294 {
295     if (do_modify_softint(env, (uint32_t)value)) {
296         trace_int_helper_write_softint(env->softint);
297     }
298 }
299