xref: /openbmc/qemu/target/cris/helper.c (revision 954a6c4f)
1 /*
2  *  CRIS helper routines.
3  *
4  *  Copyright (c) 2007 AXIS Communications AB
5  *  Written by Edgar E. Iglesias.
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #include "qemu/osdep.h"
22 #include "qemu/log.h"
23 #include "cpu.h"
24 #include "hw/core/tcg-cpu-ops.h"
25 #include "mmu.h"
26 #include "qemu/host-utils.h"
27 #include "exec/exec-all.h"
28 #include "exec/cpu_ldst.h"
29 #include "exec/helper-proto.h"
30 
31 
32 //#define CRIS_HELPER_DEBUG
33 
34 
35 #ifdef CRIS_HELPER_DEBUG
36 #define D(x) x
37 #define D_LOG(...) qemu_log(__VA_ARGS__)
38 #else
39 #define D(x)
40 #define D_LOG(...) do { } while (0)
41 #endif
42 
43 static void cris_shift_ccs(CPUCRISState *env)
44 {
45     uint32_t ccs;
46     /* Apply the ccs shift.  */
47     ccs = env->pregs[PR_CCS];
48     ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
49     env->pregs[PR_CCS] = ccs;
50 }
51 
52 bool cris_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
53                        MMUAccessType access_type, int mmu_idx,
54                        bool probe, uintptr_t retaddr)
55 {
56     CRISCPU *cpu = CRIS_CPU(cs);
57     CPUCRISState *env = &cpu->env;
58     struct cris_mmu_result res;
59     int prot, miss;
60     target_ulong phy;
61 
62     miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
63                               access_type, mmu_idx, 0);
64     if (likely(!miss)) {
65         /*
66          * Mask off the cache selection bit. The ETRAX busses do not
67          * see the top bit.
68          */
69         phy = res.phy & ~0x80000000;
70         prot = res.prot;
71         tlb_set_page(cs, address & TARGET_PAGE_MASK, phy,
72                      prot, mmu_idx, TARGET_PAGE_SIZE);
73         return true;
74     }
75 
76     if (probe) {
77         return false;
78     }
79 
80     if (cs->exception_index == EXCP_BUSFAULT) {
81         cpu_abort(cs, "CRIS: Illegal recursive bus fault."
82                       "addr=%" VADDR_PRIx " access_type=%d\n",
83                       address, access_type);
84     }
85 
86     env->pregs[PR_EDA] = address;
87     cs->exception_index = EXCP_BUSFAULT;
88     env->fault_vector = res.bf_vec;
89     if (retaddr) {
90         if (cpu_restore_state(cs, retaddr)) {
91             /* Evaluate flags after retranslation. */
92             helper_top_evaluate_flags(env);
93         }
94     }
95     cpu_loop_exit(cs);
96 }
97 
98 void crisv10_cpu_do_interrupt(CPUState *cs)
99 {
100     CRISCPU *cpu = CRIS_CPU(cs);
101     CPUCRISState *env = &cpu->env;
102     int ex_vec = -1;
103 
104     D_LOG("exception index=%d interrupt_req=%d\n",
105           cs->exception_index,
106           cs->interrupt_request);
107 
108     if (env->dslot) {
109         /* CRISv10 never takes interrupts while in a delay-slot.  */
110         cpu_abort(cs, "CRIS: Interrupt on delay-slot\n");
111     }
112 
113     assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
114     switch (cs->exception_index) {
115     case EXCP_BREAK:
116         /* These exceptions are genereated by the core itself.
117            ERP should point to the insn following the brk.  */
118         ex_vec = env->trap_vector;
119         env->pregs[PRV10_BRP] = env->pc;
120         break;
121 
122     case EXCP_NMI:
123         /* NMI is hardwired to vector zero.  */
124         ex_vec = 0;
125         env->pregs[PR_CCS] &= ~M_FLAG_V10;
126         env->pregs[PRV10_BRP] = env->pc;
127         break;
128 
129     case EXCP_BUSFAULT:
130         cpu_abort(cs, "Unhandled busfault");
131         break;
132 
133     default:
134         /* The interrupt controller gives us the vector.  */
135         ex_vec = env->interrupt_vector;
136         /* Normal interrupts are taken between
137            TB's.  env->pc is valid here.  */
138         env->pregs[PR_ERP] = env->pc;
139         break;
140     }
141 
142     if (env->pregs[PR_CCS] & U_FLAG) {
143         /* Swap stack pointers.  */
144         env->pregs[PR_USP] = env->regs[R_SP];
145         env->regs[R_SP] = env->ksp;
146     }
147 
148     /* Now that we are in kernel mode, load the handlers address.  */
149     env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
150     env->locked_irq = 1;
151     env->pregs[PR_CCS] |= F_FLAG_V10; /* set F.  */
152 
153     qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
154                   __func__, env->pc, ex_vec,
155                   env->pregs[PR_CCS],
156                   env->pregs[PR_PID],
157                   env->pregs[PR_ERP]);
158 }
159 
160 void cris_cpu_do_interrupt(CPUState *cs)
161 {
162     CRISCPU *cpu = CRIS_CPU(cs);
163     CPUCRISState *env = &cpu->env;
164     int ex_vec = -1;
165 
166     D_LOG("exception index=%d interrupt_req=%d\n",
167           cs->exception_index,
168           cs->interrupt_request);
169 
170     switch (cs->exception_index) {
171     case EXCP_BREAK:
172         /* These exceptions are genereated by the core itself.
173            ERP should point to the insn following the brk.  */
174         ex_vec = env->trap_vector;
175         env->pregs[PR_ERP] = env->pc;
176         break;
177 
178     case EXCP_NMI:
179         /* NMI is hardwired to vector zero.  */
180         ex_vec = 0;
181         env->pregs[PR_CCS] &= ~M_FLAG_V32;
182         env->pregs[PR_NRP] = env->pc;
183         break;
184 
185     case EXCP_BUSFAULT:
186         ex_vec = env->fault_vector;
187         env->pregs[PR_ERP] = env->pc;
188         break;
189 
190     default:
191         /* The interrupt controller gives us the vector.  */
192         ex_vec = env->interrupt_vector;
193         /* Normal interrupts are taken between
194            TB's.  env->pc is valid here.  */
195         env->pregs[PR_ERP] = env->pc;
196         break;
197     }
198 
199     /* Fill in the IDX field.  */
200     env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;
201 
202     if (env->dslot) {
203         D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
204               " ERP=%x pid=%x ccs=%x cc=%d %x\n",
205               ex_vec, env->pc, env->dslot,
206               env->regs[R_SP],
207               env->pregs[PR_ERP], env->pregs[PR_PID],
208               env->pregs[PR_CCS],
209               env->cc_op, env->cc_mask);
210         /* We loose the btarget, btaken state here so rexec the
211            branch.  */
212         env->pregs[PR_ERP] -= env->dslot;
213         /* Exception starts with dslot cleared.  */
214         env->dslot = 0;
215     }
216 
217     if (env->pregs[PR_CCS] & U_FLAG) {
218         /* Swap stack pointers.  */
219         env->pregs[PR_USP] = env->regs[R_SP];
220         env->regs[R_SP] = env->ksp;
221     }
222 
223     /* Apply the CRIS CCS shift. Clears U if set.  */
224     cris_shift_ccs(env);
225 
226     /* Now that we are in kernel mode, load the handlers address.
227        This load may not fault, real hw leaves that behaviour as
228        undefined.  */
229     env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
230 
231     /* Clear the excption_index to avoid spurios hw_aborts for recursive
232        bus faults.  */
233     cs->exception_index = -1;
234 
235     D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
236           __func__, env->pc, ex_vec,
237           env->pregs[PR_CCS],
238           env->pregs[PR_PID],
239           env->pregs[PR_ERP]);
240 }
241 
242 hwaddr cris_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
243 {
244     CRISCPU *cpu = CRIS_CPU(cs);
245     uint32_t phy = addr;
246     struct cris_mmu_result res;
247     int miss;
248 
249     miss = cris_mmu_translate(&res, &cpu->env, addr, MMU_DATA_LOAD, 0, 1);
250     /* If D TLB misses, try I TLB.  */
251     if (miss) {
252         miss = cris_mmu_translate(&res, &cpu->env, addr, MMU_INST_FETCH, 0, 1);
253     }
254 
255     if (!miss) {
256         phy = res.phy;
257     }
258     D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
259     return phy;
260 }
261 
262 bool cris_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
263 {
264     CPUClass *cc = CPU_GET_CLASS(cs);
265     CRISCPU *cpu = CRIS_CPU(cs);
266     CPUCRISState *env = &cpu->env;
267     bool ret = false;
268 
269     if (interrupt_request & CPU_INTERRUPT_HARD
270         && (env->pregs[PR_CCS] & I_FLAG)
271         && !env->locked_irq) {
272         cs->exception_index = EXCP_IRQ;
273         cc->tcg_ops->do_interrupt(cs);
274         ret = true;
275     }
276     if (interrupt_request & CPU_INTERRUPT_NMI) {
277         unsigned int m_flag_archval;
278         if (env->pregs[PR_VR] < 32) {
279             m_flag_archval = M_FLAG_V10;
280         } else {
281             m_flag_archval = M_FLAG_V32;
282         }
283         if ((env->pregs[PR_CCS] & m_flag_archval)) {
284             cs->exception_index = EXCP_NMI;
285             cc->tcg_ops->do_interrupt(cs);
286             ret = true;
287         }
288     }
289 
290     return ret;
291 }
292