1 /*
2 * QEMU MicroBlaze CPU
3 *
4 * Copyright (c) 2009 Edgar E. Iglesias
5 * Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
6 * Copyright (c) 2012 SUSE LINUX Products GmbH
7 * Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, see
21 * <http://www.gnu.org/licenses/lgpl-2.1.html>
22 */
23
24 #include "qemu/osdep.h"
25 #include "qemu/log.h"
26 #include "qapi/error.h"
27 #include "cpu.h"
28 #include "qemu/module.h"
29 #include "hw/qdev-properties.h"
30 #include "exec/exec-all.h"
31 #include "exec/cpu_ldst.h"
32 #include "exec/gdbstub.h"
33 #include "fpu/softfloat-helpers.h"
34 #include "tcg/tcg.h"
35
36 static const struct {
37 const char *name;
38 uint8_t version_id;
39 } mb_cpu_lookup[] = {
40 /* These key value are as per MBV field in PVR0 */
41 {"5.00.a", 0x01},
42 {"5.00.b", 0x02},
43 {"5.00.c", 0x03},
44 {"6.00.a", 0x04},
45 {"6.00.b", 0x06},
46 {"7.00.a", 0x05},
47 {"7.00.b", 0x07},
48 {"7.10.a", 0x08},
49 {"7.10.b", 0x09},
50 {"7.10.c", 0x0a},
51 {"7.10.d", 0x0b},
52 {"7.20.a", 0x0c},
53 {"7.20.b", 0x0d},
54 {"7.20.c", 0x0e},
55 {"7.20.d", 0x0f},
56 {"7.30.a", 0x10},
57 {"7.30.b", 0x11},
58 {"8.00.a", 0x12},
59 {"8.00.b", 0x13},
60 {"8.10.a", 0x14},
61 {"8.20.a", 0x15},
62 {"8.20.b", 0x16},
63 {"8.30.a", 0x17},
64 {"8.40.a", 0x18},
65 {"8.40.b", 0x19},
66 {"8.50.a", 0x1A},
67 {"9.0", 0x1B},
68 {"9.1", 0x1D},
69 {"9.2", 0x1F},
70 {"9.3", 0x20},
71 {"9.4", 0x21},
72 {"9.5", 0x22},
73 {"9.6", 0x23},
74 {"10.0", 0x24},
75 {NULL, 0},
76 };
77
78 /* If no specific version gets selected, default to the following. */
79 #define DEFAULT_CPU_VERSION "10.0"
80
mb_cpu_set_pc(CPUState * cs,vaddr value)81 static void mb_cpu_set_pc(CPUState *cs, vaddr value)
82 {
83 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
84
85 cpu->env.pc = value;
86 /* Ensure D_FLAG and IMM_FLAG are clear for the new PC */
87 cpu->env.iflags = 0;
88 }
89
mb_cpu_get_pc(CPUState * cs)90 static vaddr mb_cpu_get_pc(CPUState *cs)
91 {
92 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
93
94 return cpu->env.pc;
95 }
96
mb_cpu_synchronize_from_tb(CPUState * cs,const TranslationBlock * tb)97 static void mb_cpu_synchronize_from_tb(CPUState *cs,
98 const TranslationBlock *tb)
99 {
100 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
101
102 tcg_debug_assert(!tcg_cflags_has(cs, CF_PCREL));
103 cpu->env.pc = tb->pc;
104 cpu->env.iflags = tb->flags & IFLAGS_TB_MASK;
105 }
106
mb_restore_state_to_opc(CPUState * cs,const TranslationBlock * tb,const uint64_t * data)107 static void mb_restore_state_to_opc(CPUState *cs,
108 const TranslationBlock *tb,
109 const uint64_t *data)
110 {
111 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
112
113 cpu->env.pc = data[0];
114 cpu->env.iflags = data[1];
115 }
116
mb_cpu_has_work(CPUState * cs)117 static bool mb_cpu_has_work(CPUState *cs)
118 {
119 return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
120 }
121
mb_cpu_mmu_index(CPUState * cs,bool ifetch)122 static int mb_cpu_mmu_index(CPUState *cs, bool ifetch)
123 {
124 CPUMBState *env = cpu_env(cs);
125 MicroBlazeCPU *cpu = env_archcpu(env);
126
127 /* Are we in nommu mode?. */
128 if (!(env->msr & MSR_VM) || !cpu->cfg.use_mmu) {
129 return MMU_NOMMU_IDX;
130 }
131
132 if (env->msr & MSR_UM) {
133 return MMU_USER_IDX;
134 }
135 return MMU_KERNEL_IDX;
136 }
137
138 #ifndef CONFIG_USER_ONLY
mb_cpu_ns_axi_dp(void * opaque,int irq,int level)139 static void mb_cpu_ns_axi_dp(void *opaque, int irq, int level)
140 {
141 MicroBlazeCPU *cpu = opaque;
142 bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DP_MASK;
143
144 cpu->ns_axi_dp = level & en;
145 }
146
mb_cpu_ns_axi_ip(void * opaque,int irq,int level)147 static void mb_cpu_ns_axi_ip(void *opaque, int irq, int level)
148 {
149 MicroBlazeCPU *cpu = opaque;
150 bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IP_MASK;
151
152 cpu->ns_axi_ip = level & en;
153 }
154
mb_cpu_ns_axi_dc(void * opaque,int irq,int level)155 static void mb_cpu_ns_axi_dc(void *opaque, int irq, int level)
156 {
157 MicroBlazeCPU *cpu = opaque;
158 bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DC_MASK;
159
160 cpu->ns_axi_dc = level & en;
161 }
162
mb_cpu_ns_axi_ic(void * opaque,int irq,int level)163 static void mb_cpu_ns_axi_ic(void *opaque, int irq, int level)
164 {
165 MicroBlazeCPU *cpu = opaque;
166 bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IC_MASK;
167
168 cpu->ns_axi_ic = level & en;
169 }
170
microblaze_cpu_set_irq(void * opaque,int irq,int level)171 static void microblaze_cpu_set_irq(void *opaque, int irq, int level)
172 {
173 MicroBlazeCPU *cpu = opaque;
174 CPUState *cs = CPU(cpu);
175 int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD;
176
177 if (level) {
178 cpu_interrupt(cs, type);
179 } else {
180 cpu_reset_interrupt(cs, type);
181 }
182 }
183 #endif
184
mb_cpu_reset_hold(Object * obj,ResetType type)185 static void mb_cpu_reset_hold(Object *obj, ResetType type)
186 {
187 CPUState *cs = CPU(obj);
188 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
189 MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(obj);
190 CPUMBState *env = &cpu->env;
191
192 if (mcc->parent_phases.hold) {
193 mcc->parent_phases.hold(obj, type);
194 }
195
196 memset(env, 0, offsetof(CPUMBState, end_reset_fields));
197 env->res_addr = RES_ADDR_NONE;
198
199 /* Disable stack protector. */
200 env->shr = ~0;
201
202 env->pc = cpu->cfg.base_vectors;
203
204 set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
205 /*
206 * TODO: this is probably not the correct NaN propagation rule for
207 * this architecture.
208 */
209 set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
210
211 #if defined(CONFIG_USER_ONLY)
212 /* start in user mode with interrupts enabled. */
213 mb_cpu_write_msr(env, MSR_EE | MSR_IE | MSR_VM | MSR_UM);
214 #else
215 mb_cpu_write_msr(env, 0);
216 mmu_init(&env->mmu);
217 #endif
218 }
219
mb_disas_set_info(CPUState * cpu,disassemble_info * info)220 static void mb_disas_set_info(CPUState *cpu, disassemble_info *info)
221 {
222 info->mach = bfd_arch_microblaze;
223 info->print_insn = print_insn_microblaze;
224 }
225
mb_cpu_realizefn(DeviceState * dev,Error ** errp)226 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
227 {
228 CPUState *cs = CPU(dev);
229 MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
230 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
231 uint8_t version_code = 0;
232 const char *version;
233 int i = 0;
234 Error *local_err = NULL;
235
236 cpu_exec_realizefn(cs, &local_err);
237 if (local_err != NULL) {
238 error_propagate(errp, local_err);
239 return;
240 }
241
242 if (cpu->cfg.addr_size < 32 || cpu->cfg.addr_size > 64) {
243 error_setg(errp, "addr-size %d is out of range (32 - 64)",
244 cpu->cfg.addr_size);
245 return;
246 }
247
248 qemu_init_vcpu(cs);
249
250 version = cpu->cfg.version ? cpu->cfg.version : DEFAULT_CPU_VERSION;
251 for (i = 0; mb_cpu_lookup[i].name && version; i++) {
252 if (strcmp(mb_cpu_lookup[i].name, version) == 0) {
253 version_code = mb_cpu_lookup[i].version_id;
254 break;
255 }
256 }
257
258 if (!version_code) {
259 qemu_log("Invalid MicroBlaze version number: %s\n", cpu->cfg.version);
260 }
261
262 cpu->cfg.pvr_regs[0] =
263 (PVR0_USE_EXC_MASK |
264 PVR0_USE_ICACHE_MASK |
265 PVR0_USE_DCACHE_MASK |
266 (cpu->cfg.stackprot ? PVR0_SPROT_MASK : 0) |
267 (cpu->cfg.use_fpu ? PVR0_USE_FPU_MASK : 0) |
268 (cpu->cfg.use_hw_mul ? PVR0_USE_HW_MUL_MASK : 0) |
269 (cpu->cfg.use_barrel ? PVR0_USE_BARREL_MASK : 0) |
270 (cpu->cfg.use_div ? PVR0_USE_DIV_MASK : 0) |
271 (cpu->cfg.use_mmu ? PVR0_USE_MMU_MASK : 0) |
272 (cpu->cfg.endi ? PVR0_ENDI_MASK : 0) |
273 (version_code << PVR0_VERSION_SHIFT) |
274 (cpu->cfg.pvr == C_PVR_FULL ? PVR0_PVR_FULL_MASK : 0) |
275 cpu->cfg.pvr_user1);
276
277 cpu->cfg.pvr_regs[1] = cpu->cfg.pvr_user2;
278
279 cpu->cfg.pvr_regs[2] =
280 (PVR2_D_OPB_MASK |
281 PVR2_D_LMB_MASK |
282 PVR2_I_OPB_MASK |
283 PVR2_I_LMB_MASK |
284 PVR2_FPU_EXC_MASK |
285 (cpu->cfg.use_fpu ? PVR2_USE_FPU_MASK : 0) |
286 (cpu->cfg.use_fpu > 1 ? PVR2_USE_FPU2_MASK : 0) |
287 (cpu->cfg.use_hw_mul ? PVR2_USE_HW_MUL_MASK : 0) |
288 (cpu->cfg.use_hw_mul > 1 ? PVR2_USE_MUL64_MASK : 0) |
289 (cpu->cfg.use_barrel ? PVR2_USE_BARREL_MASK : 0) |
290 (cpu->cfg.use_div ? PVR2_USE_DIV_MASK : 0) |
291 (cpu->cfg.use_msr_instr ? PVR2_USE_MSR_INSTR : 0) |
292 (cpu->cfg.use_pcmp_instr ? PVR2_USE_PCMP_INSTR : 0) |
293 (cpu->cfg.dopb_bus_exception ? PVR2_DOPB_BUS_EXC_MASK : 0) |
294 (cpu->cfg.iopb_bus_exception ? PVR2_IOPB_BUS_EXC_MASK : 0) |
295 (cpu->cfg.div_zero_exception ? PVR2_DIV_ZERO_EXC_MASK : 0) |
296 (cpu->cfg.illegal_opcode_exception ? PVR2_ILL_OPCODE_EXC_MASK : 0) |
297 (cpu->cfg.unaligned_exceptions ? PVR2_UNALIGNED_EXC_MASK : 0) |
298 (cpu->cfg.opcode_0_illegal ? PVR2_OPCODE_0x0_ILL_MASK : 0));
299
300 cpu->cfg.pvr_regs[5] |=
301 cpu->cfg.dcache_writeback ? PVR5_DCACHE_WRITEBACK_MASK : 0;
302
303 cpu->cfg.pvr_regs[10] =
304 (0x0c000000 | /* Default to spartan 3a dsp family. */
305 (cpu->cfg.addr_size - 32) << PVR10_ASIZE_SHIFT);
306
307 cpu->cfg.pvr_regs[11] = ((cpu->cfg.use_mmu ? PVR11_USE_MMU : 0) |
308 16 << 17);
309
310 cpu->cfg.mmu = 3;
311 cpu->cfg.mmu_tlb_access = 3;
312 cpu->cfg.mmu_zones = 16;
313 cpu->cfg.addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
314
315 mcc->parent_realize(dev, errp);
316 }
317
mb_cpu_initfn(Object * obj)318 static void mb_cpu_initfn(Object *obj)
319 {
320 MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
321
322 gdb_register_coprocessor(CPU(cpu), mb_cpu_gdb_read_stack_protect,
323 mb_cpu_gdb_write_stack_protect,
324 gdb_find_static_feature("microblaze-stack-protect.xml"),
325 0);
326
327 #ifndef CONFIG_USER_ONLY
328 /* Inbound IRQ and FIR lines */
329 qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
330 qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dp, "ns_axi_dp", 1);
331 qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ip, "ns_axi_ip", 1);
332 qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dc, "ns_axi_dc", 1);
333 qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ic, "ns_axi_ic", 1);
334 #endif
335
336 /* Restricted 'endianness' property is equivalent of 'little-endian' */
337 object_property_add_alias(obj, "little-endian", obj, "endianness");
338 }
339
340 static Property mb_properties[] = {
341 /*
342 * Following properties are used by Xilinx DTS conversion tool
343 * do not rename them.
344 */
345 DEFINE_PROP_UINT32("base-vectors", MicroBlazeCPU, cfg.base_vectors, 0),
346 DEFINE_PROP_BOOL("use-stack-protection", MicroBlazeCPU, cfg.stackprot,
347 false),
348 /*
349 * This is the C_ADDR_SIZE synth-time configuration option of the
350 * MicroBlaze cores. Supported values range between 32 and 64.
351 *
352 * When set to > 32, 32bit MicroBlaze can emit load/stores
353 * with extended addressing.
354 */
355 DEFINE_PROP_UINT8("addr-size", MicroBlazeCPU, cfg.addr_size, 32),
356 /* If use-fpu > 0 - FPU is enabled
357 * If use-fpu = 2 - Floating point conversion and square root instructions
358 * are enabled
359 */
360 DEFINE_PROP_UINT8("use-fpu", MicroBlazeCPU, cfg.use_fpu, 2),
361 /* If use-hw-mul > 0 - Multiplier is enabled
362 * If use-hw-mul = 2 - 64-bit multiplier is enabled
363 */
364 DEFINE_PROP_UINT8("use-hw-mul", MicroBlazeCPU, cfg.use_hw_mul, 2),
365 DEFINE_PROP_BOOL("use-barrel", MicroBlazeCPU, cfg.use_barrel, true),
366 DEFINE_PROP_BOOL("use-div", MicroBlazeCPU, cfg.use_div, true),
367 DEFINE_PROP_BOOL("use-msr-instr", MicroBlazeCPU, cfg.use_msr_instr, true),
368 DEFINE_PROP_BOOL("use-pcmp-instr", MicroBlazeCPU, cfg.use_pcmp_instr, true),
369 DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),
370 /*
371 * use-non-secure enables/disables the use of the non_secure[3:0] signals.
372 * It is a bitfield where 1 = non-secure for the following bits and their
373 * corresponding interfaces:
374 * 0x1 - M_AXI_DP
375 * 0x2 - M_AXI_IP
376 * 0x4 - M_AXI_DC
377 * 0x8 - M_AXI_IC
378 */
379 DEFINE_PROP_UINT8("use-non-secure", MicroBlazeCPU, cfg.use_non_secure, 0),
380 DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
381 false),
382 DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),
383 /* Enables bus exceptions on failed data accesses (load/stores). */
384 DEFINE_PROP_BOOL("dopb-bus-exception", MicroBlazeCPU,
385 cfg.dopb_bus_exception, false),
386 /* Enables bus exceptions on failed instruction fetches. */
387 DEFINE_PROP_BOOL("iopb-bus-exception", MicroBlazeCPU,
388 cfg.iopb_bus_exception, false),
389 DEFINE_PROP_BOOL("ill-opcode-exception", MicroBlazeCPU,
390 cfg.illegal_opcode_exception, false),
391 DEFINE_PROP_BOOL("div-zero-exception", MicroBlazeCPU,
392 cfg.div_zero_exception, false),
393 DEFINE_PROP_BOOL("unaligned-exceptions", MicroBlazeCPU,
394 cfg.unaligned_exceptions, false),
395 DEFINE_PROP_BOOL("opcode-0x0-illegal", MicroBlazeCPU,
396 cfg.opcode_0_illegal, false),
397 DEFINE_PROP_STRING("version", MicroBlazeCPU, cfg.version),
398 DEFINE_PROP_UINT8("pvr", MicroBlazeCPU, cfg.pvr, C_PVR_FULL),
399 DEFINE_PROP_UINT8("pvr-user1", MicroBlazeCPU, cfg.pvr_user1, 0),
400 DEFINE_PROP_UINT32("pvr-user2", MicroBlazeCPU, cfg.pvr_user2, 0),
401 /*
402 * End of properties reserved by Xilinx DTS conversion tool.
403 */
404 DEFINE_PROP_END_OF_LIST(),
405 };
406
mb_cpu_class_by_name(const char * cpu_model)407 static ObjectClass *mb_cpu_class_by_name(const char *cpu_model)
408 {
409 return object_class_by_name(TYPE_MICROBLAZE_CPU);
410 }
411
412 #ifndef CONFIG_USER_ONLY
413 #include "hw/core/sysemu-cpu-ops.h"
414
415 static const struct SysemuCPUOps mb_sysemu_ops = {
416 .get_phys_page_attrs_debug = mb_cpu_get_phys_page_attrs_debug,
417 };
418 #endif
419
420 #include "hw/core/tcg-cpu-ops.h"
421
422 static const TCGCPUOps mb_tcg_ops = {
423 .initialize = mb_tcg_init,
424 .synchronize_from_tb = mb_cpu_synchronize_from_tb,
425 .restore_state_to_opc = mb_restore_state_to_opc,
426
427 #ifndef CONFIG_USER_ONLY
428 .tlb_fill = mb_cpu_tlb_fill,
429 .cpu_exec_interrupt = mb_cpu_exec_interrupt,
430 .cpu_exec_halt = mb_cpu_has_work,
431 .do_interrupt = mb_cpu_do_interrupt,
432 .do_transaction_failed = mb_cpu_transaction_failed,
433 .do_unaligned_access = mb_cpu_do_unaligned_access,
434 #endif /* !CONFIG_USER_ONLY */
435 };
436
mb_cpu_class_init(ObjectClass * oc,void * data)437 static void mb_cpu_class_init(ObjectClass *oc, void *data)
438 {
439 DeviceClass *dc = DEVICE_CLASS(oc);
440 CPUClass *cc = CPU_CLASS(oc);
441 MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
442 ResettableClass *rc = RESETTABLE_CLASS(oc);
443
444 device_class_set_parent_realize(dc, mb_cpu_realizefn,
445 &mcc->parent_realize);
446 resettable_class_set_parent_phases(rc, NULL, mb_cpu_reset_hold, NULL,
447 &mcc->parent_phases);
448
449 cc->class_by_name = mb_cpu_class_by_name;
450 cc->has_work = mb_cpu_has_work;
451 cc->mmu_index = mb_cpu_mmu_index;
452 cc->dump_state = mb_cpu_dump_state;
453 cc->set_pc = mb_cpu_set_pc;
454 cc->get_pc = mb_cpu_get_pc;
455 cc->gdb_read_register = mb_cpu_gdb_read_register;
456 cc->gdb_write_register = mb_cpu_gdb_write_register;
457
458 #ifndef CONFIG_USER_ONLY
459 dc->vmsd = &vmstate_mb_cpu;
460 cc->sysemu_ops = &mb_sysemu_ops;
461 #endif
462 device_class_set_props(dc, mb_properties);
463 cc->gdb_core_xml_file = "microblaze-core.xml";
464
465 cc->disas_set_info = mb_disas_set_info;
466 cc->tcg_ops = &mb_tcg_ops;
467 }
468
469 static const TypeInfo mb_cpu_type_info = {
470 .name = TYPE_MICROBLAZE_CPU,
471 .parent = TYPE_CPU,
472 .instance_size = sizeof(MicroBlazeCPU),
473 .instance_align = __alignof(MicroBlazeCPU),
474 .instance_init = mb_cpu_initfn,
475 .class_size = sizeof(MicroBlazeCPUClass),
476 .class_init = mb_cpu_class_init,
477 };
478
mb_cpu_register_types(void)479 static void mb_cpu_register_types(void)
480 {
481 type_register_static(&mb_cpu_type_info);
482 }
483
484 type_init(mb_cpu_register_types)
485