xref: /openbmc/qemu/target/microblaze/cpu.c (revision 7c08eefc) 
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 
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 
90 static vaddr mb_cpu_get_pc(CPUState *cs)
91 {
92     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
93 
94     return cpu->env.pc;
95 }
96 
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 
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 
117 static bool mb_cpu_has_work(CPUState *cs)
118 {
119     return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
120 }
121 
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
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 
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 
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 
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 
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 
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 #if defined(CONFIG_USER_ONLY)
205     /* start in user mode with interrupts enabled.  */
206     mb_cpu_write_msr(env, MSR_EE | MSR_IE | MSR_VM | MSR_UM);
207 #else
208     mb_cpu_write_msr(env, 0);
209     mmu_init(&env->mmu);
210 #endif
211 }
212 
213 static void mb_disas_set_info(CPUState *cpu, disassemble_info *info)
214 {
215     info->mach = bfd_arch_microblaze;
216     info->print_insn = print_insn_microblaze;
217 }
218 
219 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
220 {
221     CPUState *cs = CPU(dev);
222     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
223     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
224     uint8_t version_code = 0;
225     const char *version;
226     int i = 0;
227     Error *local_err = NULL;
228 
229     cpu_exec_realizefn(cs, &local_err);
230     if (local_err != NULL) {
231         error_propagate(errp, local_err);
232         return;
233     }
234 
235     if (cpu->cfg.addr_size < 32 || cpu->cfg.addr_size > 64) {
236         error_setg(errp, "addr-size %d is out of range (32 - 64)",
237                    cpu->cfg.addr_size);
238         return;
239     }
240 
241     qemu_init_vcpu(cs);
242 
243     version = cpu->cfg.version ? cpu->cfg.version : DEFAULT_CPU_VERSION;
244     for (i = 0; mb_cpu_lookup[i].name && version; i++) {
245         if (strcmp(mb_cpu_lookup[i].name, version) == 0) {
246             version_code = mb_cpu_lookup[i].version_id;
247             break;
248         }
249     }
250 
251     if (!version_code) {
252         qemu_log("Invalid MicroBlaze version number: %s\n", cpu->cfg.version);
253     }
254 
255     cpu->cfg.pvr_regs[0] =
256         (PVR0_USE_EXC_MASK |
257          PVR0_USE_ICACHE_MASK |
258          PVR0_USE_DCACHE_MASK |
259          (cpu->cfg.stackprot ? PVR0_SPROT_MASK : 0) |
260          (cpu->cfg.use_fpu ? PVR0_USE_FPU_MASK : 0) |
261          (cpu->cfg.use_hw_mul ? PVR0_USE_HW_MUL_MASK : 0) |
262          (cpu->cfg.use_barrel ? PVR0_USE_BARREL_MASK : 0) |
263          (cpu->cfg.use_div ? PVR0_USE_DIV_MASK : 0) |
264          (cpu->cfg.use_mmu ? PVR0_USE_MMU_MASK : 0) |
265          (cpu->cfg.endi ? PVR0_ENDI_MASK : 0) |
266          (version_code << PVR0_VERSION_SHIFT) |
267          (cpu->cfg.pvr == C_PVR_FULL ? PVR0_PVR_FULL_MASK : 0) |
268          cpu->cfg.pvr_user1);
269 
270     cpu->cfg.pvr_regs[1] = cpu->cfg.pvr_user2;
271 
272     cpu->cfg.pvr_regs[2] =
273         (PVR2_D_OPB_MASK |
274          PVR2_D_LMB_MASK |
275          PVR2_I_OPB_MASK |
276          PVR2_I_LMB_MASK |
277          PVR2_FPU_EXC_MASK |
278          (cpu->cfg.use_fpu ? PVR2_USE_FPU_MASK : 0) |
279          (cpu->cfg.use_fpu > 1 ? PVR2_USE_FPU2_MASK : 0) |
280          (cpu->cfg.use_hw_mul ? PVR2_USE_HW_MUL_MASK : 0) |
281          (cpu->cfg.use_hw_mul > 1 ? PVR2_USE_MUL64_MASK : 0) |
282          (cpu->cfg.use_barrel ? PVR2_USE_BARREL_MASK : 0) |
283          (cpu->cfg.use_div ? PVR2_USE_DIV_MASK : 0) |
284          (cpu->cfg.use_msr_instr ? PVR2_USE_MSR_INSTR : 0) |
285          (cpu->cfg.use_pcmp_instr ? PVR2_USE_PCMP_INSTR : 0) |
286          (cpu->cfg.dopb_bus_exception ? PVR2_DOPB_BUS_EXC_MASK : 0) |
287          (cpu->cfg.iopb_bus_exception ? PVR2_IOPB_BUS_EXC_MASK : 0) |
288          (cpu->cfg.div_zero_exception ? PVR2_DIV_ZERO_EXC_MASK : 0) |
289          (cpu->cfg.illegal_opcode_exception ? PVR2_ILL_OPCODE_EXC_MASK : 0) |
290          (cpu->cfg.unaligned_exceptions ? PVR2_UNALIGNED_EXC_MASK : 0) |
291          (cpu->cfg.opcode_0_illegal ? PVR2_OPCODE_0x0_ILL_MASK : 0));
292 
293     cpu->cfg.pvr_regs[5] |=
294         cpu->cfg.dcache_writeback ? PVR5_DCACHE_WRITEBACK_MASK : 0;
295 
296     cpu->cfg.pvr_regs[10] =
297         (0x0c000000 | /* Default to spartan 3a dsp family.  */
298          (cpu->cfg.addr_size - 32) << PVR10_ASIZE_SHIFT);
299 
300     cpu->cfg.pvr_regs[11] = ((cpu->cfg.use_mmu ? PVR11_USE_MMU : 0) |
301                              16 << 17);
302 
303     cpu->cfg.mmu = 3;
304     cpu->cfg.mmu_tlb_access = 3;
305     cpu->cfg.mmu_zones = 16;
306     cpu->cfg.addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
307 
308     mcc->parent_realize(dev, errp);
309 }
310 
311 static void mb_cpu_initfn(Object *obj)
312 {
313     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
314     CPUMBState *env = &cpu->env;
315 
316     gdb_register_coprocessor(CPU(cpu), mb_cpu_gdb_read_stack_protect,
317                              mb_cpu_gdb_write_stack_protect,
318                              gdb_find_static_feature("microblaze-stack-protect.xml"),
319                              0);
320 
321     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
322 
323 #ifndef CONFIG_USER_ONLY
324     /* Inbound IRQ and FIR lines */
325     qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
326     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dp, "ns_axi_dp", 1);
327     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ip, "ns_axi_ip", 1);
328     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dc, "ns_axi_dc", 1);
329     qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ic, "ns_axi_ic", 1);
330 #endif
331 }
332 
333 static Property mb_properties[] = {
334     DEFINE_PROP_UINT32("base-vectors", MicroBlazeCPU, cfg.base_vectors, 0),
335     DEFINE_PROP_BOOL("use-stack-protection", MicroBlazeCPU, cfg.stackprot,
336                      false),
337     /*
338      * This is the C_ADDR_SIZE synth-time configuration option of the
339      * MicroBlaze cores. Supported values range between 32 and 64.
340      *
341      * When set to > 32, 32bit MicroBlaze can emit load/stores
342      * with extended addressing.
343      */
344     DEFINE_PROP_UINT8("addr-size", MicroBlazeCPU, cfg.addr_size, 32),
345     /* If use-fpu > 0 - FPU is enabled
346      * If use-fpu = 2 - Floating point conversion and square root instructions
347      *                  are enabled
348      */
349     DEFINE_PROP_UINT8("use-fpu", MicroBlazeCPU, cfg.use_fpu, 2),
350     /* If use-hw-mul > 0 - Multiplier is enabled
351      * If use-hw-mul = 2 - 64-bit multiplier is enabled
352      */
353     DEFINE_PROP_UINT8("use-hw-mul", MicroBlazeCPU, cfg.use_hw_mul, 2),
354     DEFINE_PROP_BOOL("use-barrel", MicroBlazeCPU, cfg.use_barrel, true),
355     DEFINE_PROP_BOOL("use-div", MicroBlazeCPU, cfg.use_div, true),
356     DEFINE_PROP_BOOL("use-msr-instr", MicroBlazeCPU, cfg.use_msr_instr, true),
357     DEFINE_PROP_BOOL("use-pcmp-instr", MicroBlazeCPU, cfg.use_pcmp_instr, true),
358     DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),
359     /*
360      * use-non-secure enables/disables the use of the non_secure[3:0] signals.
361      * It is a bitfield where 1 = non-secure for the following bits and their
362      * corresponding interfaces:
363      * 0x1 - M_AXI_DP
364      * 0x2 - M_AXI_IP
365      * 0x4 - M_AXI_DC
366      * 0x8 - M_AXI_IC
367      */
368     DEFINE_PROP_UINT8("use-non-secure", MicroBlazeCPU, cfg.use_non_secure, 0),
369     DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
370                      false),
371     DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),
372     /* Enables bus exceptions on failed data accesses (load/stores).  */
373     DEFINE_PROP_BOOL("dopb-bus-exception", MicroBlazeCPU,
374                      cfg.dopb_bus_exception, false),
375     /* Enables bus exceptions on failed instruction fetches.  */
376     DEFINE_PROP_BOOL("iopb-bus-exception", MicroBlazeCPU,
377                      cfg.iopb_bus_exception, false),
378     DEFINE_PROP_BOOL("ill-opcode-exception", MicroBlazeCPU,
379                      cfg.illegal_opcode_exception, false),
380     DEFINE_PROP_BOOL("div-zero-exception", MicroBlazeCPU,
381                      cfg.div_zero_exception, false),
382     DEFINE_PROP_BOOL("unaligned-exceptions", MicroBlazeCPU,
383                      cfg.unaligned_exceptions, false),
384     DEFINE_PROP_BOOL("opcode-0x0-illegal", MicroBlazeCPU,
385                      cfg.opcode_0_illegal, false),
386     DEFINE_PROP_STRING("version", MicroBlazeCPU, cfg.version),
387     DEFINE_PROP_UINT8("pvr", MicroBlazeCPU, cfg.pvr, C_PVR_FULL),
388     DEFINE_PROP_UINT8("pvr-user1", MicroBlazeCPU, cfg.pvr_user1, 0),
389     DEFINE_PROP_UINT32("pvr-user2", MicroBlazeCPU, cfg.pvr_user2, 0),
390     DEFINE_PROP_END_OF_LIST(),
391 };
392 
393 static ObjectClass *mb_cpu_class_by_name(const char *cpu_model)
394 {
395     return object_class_by_name(TYPE_MICROBLAZE_CPU);
396 }
397 
398 #ifndef CONFIG_USER_ONLY
399 #include "hw/core/sysemu-cpu-ops.h"
400 
401 static const struct SysemuCPUOps mb_sysemu_ops = {
402     .get_phys_page_attrs_debug = mb_cpu_get_phys_page_attrs_debug,
403 };
404 #endif
405 
406 #include "hw/core/tcg-cpu-ops.h"
407 
408 static const TCGCPUOps mb_tcg_ops = {
409     .initialize = mb_tcg_init,
410     .synchronize_from_tb = mb_cpu_synchronize_from_tb,
411     .restore_state_to_opc = mb_restore_state_to_opc,
412 
413 #ifndef CONFIG_USER_ONLY
414     .tlb_fill = mb_cpu_tlb_fill,
415     .cpu_exec_interrupt = mb_cpu_exec_interrupt,
416     .do_interrupt = mb_cpu_do_interrupt,
417     .do_transaction_failed = mb_cpu_transaction_failed,
418     .do_unaligned_access = mb_cpu_do_unaligned_access,
419 #endif /* !CONFIG_USER_ONLY */
420 };
421 
422 static void mb_cpu_class_init(ObjectClass *oc, void *data)
423 {
424     DeviceClass *dc = DEVICE_CLASS(oc);
425     CPUClass *cc = CPU_CLASS(oc);
426     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
427     ResettableClass *rc = RESETTABLE_CLASS(oc);
428 
429     device_class_set_parent_realize(dc, mb_cpu_realizefn,
430                                     &mcc->parent_realize);
431     resettable_class_set_parent_phases(rc, NULL, mb_cpu_reset_hold, NULL,
432                                        &mcc->parent_phases);
433 
434     cc->class_by_name = mb_cpu_class_by_name;
435     cc->has_work = mb_cpu_has_work;
436     cc->mmu_index = mb_cpu_mmu_index;
437     cc->dump_state = mb_cpu_dump_state;
438     cc->set_pc = mb_cpu_set_pc;
439     cc->get_pc = mb_cpu_get_pc;
440     cc->gdb_read_register = mb_cpu_gdb_read_register;
441     cc->gdb_write_register = mb_cpu_gdb_write_register;
442 
443 #ifndef CONFIG_USER_ONLY
444     dc->vmsd = &vmstate_mb_cpu;
445     cc->sysemu_ops = &mb_sysemu_ops;
446 #endif
447     device_class_set_props(dc, mb_properties);
448     cc->gdb_core_xml_file = "microblaze-core.xml";
449 
450     cc->disas_set_info = mb_disas_set_info;
451     cc->tcg_ops = &mb_tcg_ops;
452 }
453 
454 static const TypeInfo mb_cpu_type_info = {
455     .name = TYPE_MICROBLAZE_CPU,
456     .parent = TYPE_CPU,
457     .instance_size = sizeof(MicroBlazeCPU),
458     .instance_align = __alignof(MicroBlazeCPU),
459     .instance_init = mb_cpu_initfn,
460     .class_size = sizeof(MicroBlazeCPUClass),
461     .class_init = mb_cpu_class_init,
462 };
463 
464 static void mb_cpu_register_types(void)
465 {
466     type_register_static(&mb_cpu_type_info);
467 }
468 
469 type_init(mb_cpu_register_types)
470