xref: /openbmc/qemu/hw/sparc/leon3.c (revision 0b1183e3)
1 /*
2  * QEMU Leon3 System Emulator
3  *
4  * Copyright (c) 2010-2011 AdaCore
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 #include "qemu/osdep.h"
25 #include "qapi/error.h"
26 #include "qemu-common.h"
27 #include "cpu.h"
28 #include "hw/hw.h"
29 #include "qemu/timer.h"
30 #include "hw/ptimer.h"
31 #include "sysemu/sysemu.h"
32 #include "sysemu/qtest.h"
33 #include "hw/boards.h"
34 #include "hw/loader.h"
35 #include "elf.h"
36 #include "trace.h"
37 #include "exec/address-spaces.h"
38 
39 #include "hw/sparc/grlib.h"
40 
41 /* Default system clock.  */
42 #define CPU_CLK (40 * 1000 * 1000)
43 
44 #define PROM_FILENAME        "u-boot.bin"
45 
46 #define MAX_PILS 16
47 
48 typedef struct ResetData {
49     SPARCCPU *cpu;
50     uint32_t  entry;            /* save kernel entry in case of reset */
51     target_ulong sp;            /* initial stack pointer */
52 } ResetData;
53 
54 static void main_cpu_reset(void *opaque)
55 {
56     ResetData *s   = (ResetData *)opaque;
57     CPUState *cpu = CPU(s->cpu);
58     CPUSPARCState  *env = &s->cpu->env;
59 
60     cpu_reset(cpu);
61 
62     cpu->halted = 0;
63     env->pc     = s->entry;
64     env->npc    = s->entry + 4;
65     env->regbase[6] = s->sp;
66 }
67 
68 void leon3_irq_ack(void *irq_manager, int intno)
69 {
70     grlib_irqmp_ack((DeviceState *)irq_manager, intno);
71 }
72 
73 static void leon3_set_pil_in(void *opaque, uint32_t pil_in)
74 {
75     CPUSPARCState *env = (CPUSPARCState *)opaque;
76     CPUState *cs;
77 
78     assert(env != NULL);
79 
80     env->pil_in = pil_in;
81 
82     if (env->pil_in && (env->interrupt_index == 0 ||
83                         (env->interrupt_index & ~15) == TT_EXTINT)) {
84         unsigned int i;
85 
86         for (i = 15; i > 0; i--) {
87             if (env->pil_in & (1 << i)) {
88                 int old_interrupt = env->interrupt_index;
89 
90                 env->interrupt_index = TT_EXTINT | i;
91                 if (old_interrupt != env->interrupt_index) {
92                     cs = CPU(sparc_env_get_cpu(env));
93                     trace_leon3_set_irq(i);
94                     cpu_interrupt(cs, CPU_INTERRUPT_HARD);
95                 }
96                 break;
97             }
98         }
99     } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
100         cs = CPU(sparc_env_get_cpu(env));
101         trace_leon3_reset_irq(env->interrupt_index & 15);
102         env->interrupt_index = 0;
103         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
104     }
105 }
106 
107 static void leon3_generic_hw_init(MachineState *machine)
108 {
109     ram_addr_t ram_size = machine->ram_size;
110     const char *cpu_model = machine->cpu_model;
111     const char *kernel_filename = machine->kernel_filename;
112     SPARCCPU *cpu;
113     CPUSPARCState   *env;
114     MemoryRegion *address_space_mem = get_system_memory();
115     MemoryRegion *ram = g_new(MemoryRegion, 1);
116     MemoryRegion *prom = g_new(MemoryRegion, 1);
117     int         ret;
118     char       *filename;
119     qemu_irq   *cpu_irqs = NULL;
120     int         bios_size;
121     int         prom_size;
122     ResetData  *reset_info;
123 
124     /* Init CPU */
125     if (!cpu_model) {
126         cpu_model = "LEON3";
127     }
128 
129     cpu = cpu_sparc_init(cpu_model);
130     if (cpu == NULL) {
131         fprintf(stderr, "qemu: Unable to find Sparc CPU definition\n");
132         exit(1);
133     }
134     env = &cpu->env;
135 
136     cpu_sparc_set_id(env, 0);
137 
138     /* Reset data */
139     reset_info        = g_malloc0(sizeof(ResetData));
140     reset_info->cpu   = cpu;
141     reset_info->sp    = 0x40000000 + ram_size;
142     qemu_register_reset(main_cpu_reset, reset_info);
143 
144     /* Allocate IRQ manager */
145     grlib_irqmp_create(0x80000200, env, &cpu_irqs, MAX_PILS, &leon3_set_pil_in);
146 
147     env->qemu_irq_ack = leon3_irq_manager;
148 
149     /* Allocate RAM */
150     if ((uint64_t)ram_size > (1UL << 30)) {
151         fprintf(stderr,
152                 "qemu: Too much memory for this machine: %d, maximum 1G\n",
153                 (unsigned int)(ram_size / (1024 * 1024)));
154         exit(1);
155     }
156 
157     memory_region_allocate_system_memory(ram, NULL, "leon3.ram", ram_size);
158     memory_region_add_subregion(address_space_mem, 0x40000000, ram);
159 
160     /* Allocate BIOS */
161     prom_size = 8 * 1024 * 1024; /* 8Mb */
162     memory_region_init_ram(prom, NULL, "Leon3.bios", prom_size, &error_fatal);
163     memory_region_set_readonly(prom, true);
164     memory_region_add_subregion(address_space_mem, 0x00000000, prom);
165 
166     /* Load boot prom */
167     if (bios_name == NULL) {
168         bios_name = PROM_FILENAME;
169     }
170     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
171 
172     if (filename) {
173         bios_size = get_image_size(filename);
174     } else {
175         bios_size = -1;
176     }
177 
178     if (bios_size > prom_size) {
179         fprintf(stderr, "qemu: could not load prom '%s': file too big\n",
180                 filename);
181         exit(1);
182     }
183 
184     if (bios_size > 0) {
185         ret = load_image_targphys(filename, 0x00000000, bios_size);
186         if (ret < 0 || ret > prom_size) {
187             fprintf(stderr, "qemu: could not load prom '%s'\n", filename);
188             exit(1);
189         }
190     } else if (kernel_filename == NULL && !qtest_enabled()) {
191         fprintf(stderr, "Can't read bios image %s\n", filename);
192         exit(1);
193     }
194     g_free(filename);
195 
196     /* Can directly load an application. */
197     if (kernel_filename != NULL) {
198         long     kernel_size;
199         uint64_t entry;
200 
201         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
202                                1 /* big endian */, EM_SPARC, 0, 0);
203         if (kernel_size < 0) {
204             fprintf(stderr, "qemu: could not load kernel '%s'\n",
205                     kernel_filename);
206             exit(1);
207         }
208         if (bios_size <= 0) {
209             /* If there is no bios/monitor, start the application.  */
210             env->pc = entry;
211             env->npc = entry + 4;
212             reset_info->entry = entry;
213         }
214     }
215 
216     /* Allocate timers */
217     grlib_gptimer_create(0x80000300, 2, CPU_CLK, cpu_irqs, 6);
218 
219     /* Allocate uart */
220     if (serial_hds[0]) {
221         grlib_apbuart_create(0x80000100, serial_hds[0], cpu_irqs[3]);
222     }
223 }
224 
225 static void leon3_generic_machine_init(MachineClass *mc)
226 {
227     mc->desc = "Leon-3 generic";
228     mc->init = leon3_generic_hw_init;
229 }
230 
231 DEFINE_MACHINE("leon3_generic", leon3_generic_machine_init)
232