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Annotation of qemu/hw/leon3.c, revision 1.1

1.1     ! root        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 "hw.h"
        !            25: #include "qemu-timer.h"
        !            26: #include "qemu-char.h"
        !            27: #include "sysemu.h"
        !            28: #include "boards.h"
        !            29: #include "loader.h"
        !            30: #include "elf.h"
        !            31: #include "trace.h"
        !            32: 
        !            33: #include "grlib.h"
        !            34: 
        !            35: /* Default system clock.  */
        !            36: #define CPU_CLK (40 * 1000 * 1000)
        !            37: 
        !            38: #define PROM_FILENAME        "u-boot.bin"
        !            39: 
        !            40: #define MAX_PILS 16
        !            41: 
        !            42: typedef struct ResetData {
        !            43:     CPUState *env;
        !            44:     uint32_t  entry;            /* save kernel entry in case of reset */
        !            45: } ResetData;
        !            46: 
        !            47: static void main_cpu_reset(void *opaque)
        !            48: {
        !            49:     ResetData *s   = (ResetData *)opaque;
        !            50:     CPUState  *env = s->env;
        !            51: 
        !            52:     cpu_reset(env);
        !            53: 
        !            54:     env->halted = 0;
        !            55:     env->pc     = s->entry;
        !            56:     env->npc    = s->entry + 4;
        !            57: }
        !            58: 
        !            59: void leon3_irq_ack(void *irq_manager, int intno)
        !            60: {
        !            61:     grlib_irqmp_ack((DeviceState *)irq_manager, intno);
        !            62: }
        !            63: 
        !            64: static void leon3_set_pil_in(void *opaque, uint32_t pil_in)
        !            65: {
        !            66:     CPUState *env = (CPUState *)opaque;
        !            67: 
        !            68:     assert(env != NULL);
        !            69: 
        !            70:     env->pil_in = pil_in;
        !            71: 
        !            72:     if (env->pil_in && (env->interrupt_index == 0 ||
        !            73:                         (env->interrupt_index & ~15) == TT_EXTINT)) {
        !            74:         unsigned int i;
        !            75: 
        !            76:         for (i = 15; i > 0; i--) {
        !            77:             if (env->pil_in & (1 << i)) {
        !            78:                 int old_interrupt = env->interrupt_index;
        !            79: 
        !            80:                 env->interrupt_index = TT_EXTINT | i;
        !            81:                 if (old_interrupt != env->interrupt_index) {
        !            82:                     trace_leon3_set_irq(i);
        !            83:                     cpu_interrupt(env, CPU_INTERRUPT_HARD);
        !            84:                 }
        !            85:                 break;
        !            86:             }
        !            87:         }
        !            88:     } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
        !            89:         trace_leon3_reset_irq(env->interrupt_index & 15);
        !            90:         env->interrupt_index = 0;
        !            91:         cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
        !            92:     }
        !            93: }
        !            94: 
        !            95: static void leon3_generic_hw_init(ram_addr_t  ram_size,
        !            96:                                   const char *boot_device,
        !            97:                                   const char *kernel_filename,
        !            98:                                   const char *kernel_cmdline,
        !            99:                                   const char *initrd_filename,
        !           100:                                   const char *cpu_model)
        !           101: {
        !           102:     CPUState   *env;
        !           103:     ram_addr_t  ram_offset, prom_offset;
        !           104:     int         ret;
        !           105:     char       *filename;
        !           106:     qemu_irq   *cpu_irqs = NULL;
        !           107:     int         bios_size;
        !           108:     int         prom_size;
        !           109:     ResetData  *reset_info;
        !           110: 
        !           111:     /* Init CPU */
        !           112:     if (!cpu_model) {
        !           113:         cpu_model = "LEON3";
        !           114:     }
        !           115: 
        !           116:     env = cpu_init(cpu_model);
        !           117:     if (!env) {
        !           118:         fprintf(stderr, "qemu: Unable to find Sparc CPU definition\n");
        !           119:         exit(1);
        !           120:     }
        !           121: 
        !           122:     cpu_sparc_set_id(env, 0);
        !           123: 
        !           124:     /* Reset data */
        !           125:     reset_info        = qemu_mallocz(sizeof(ResetData));
        !           126:     reset_info->env   = env;
        !           127:     qemu_register_reset(main_cpu_reset, reset_info);
        !           128: 
        !           129:     /* Allocate IRQ manager */
        !           130:     grlib_irqmp_create(0x80000200, env, &cpu_irqs, MAX_PILS, &leon3_set_pil_in);
        !           131: 
        !           132:     env->qemu_irq_ack = leon3_irq_manager;
        !           133: 
        !           134:     /* Allocate RAM */
        !           135:     if ((uint64_t)ram_size > (1UL << 30)) {
        !           136:         fprintf(stderr,
        !           137:                 "qemu: Too much memory for this machine: %d, maximum 1G\n",
        !           138:                 (unsigned int)(ram_size / (1024 * 1024)));
        !           139:         exit(1);
        !           140:     }
        !           141: 
        !           142:     ram_offset = qemu_ram_alloc(NULL, "leon3.ram", ram_size);
        !           143:     cpu_register_physical_memory(0x40000000, ram_size, ram_offset | IO_MEM_RAM);
        !           144: 
        !           145:     /* Allocate BIOS */
        !           146:     prom_size = 8 * 1024 * 1024; /* 8Mb */
        !           147:     prom_offset = qemu_ram_alloc(NULL, "Leon3.bios", prom_size);
        !           148:     cpu_register_physical_memory(0x00000000, prom_size,
        !           149:                                  prom_offset | IO_MEM_ROM);
        !           150: 
        !           151:     /* Load boot prom */
        !           152:     if (bios_name == NULL) {
        !           153:         bios_name = PROM_FILENAME;
        !           154:     }
        !           155:     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
        !           156: 
        !           157:     bios_size = get_image_size(filename);
        !           158: 
        !           159:     if (bios_size > prom_size) {
        !           160:         fprintf(stderr, "qemu: could not load prom '%s': file too big\n",
        !           161:                 filename);
        !           162:         exit(1);
        !           163:     }
        !           164: 
        !           165:     if (bios_size > 0) {
        !           166:         ret = load_image_targphys(filename, 0x00000000, bios_size);
        !           167:         if (ret < 0 || ret > prom_size) {
        !           168:             fprintf(stderr, "qemu: could not load prom '%s'\n", filename);
        !           169:             exit(1);
        !           170:         }
        !           171:     } else if (kernel_filename == NULL) {
        !           172:         fprintf(stderr, "Can't read bios image %s\n", filename);
        !           173:         exit(1);
        !           174:     }
        !           175: 
        !           176:     /* Can directly load an application. */
        !           177:     if (kernel_filename != NULL) {
        !           178:         long     kernel_size;
        !           179:         uint64_t entry;
        !           180: 
        !           181:         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
        !           182:                                1 /* big endian */, ELF_MACHINE, 0);
        !           183:         if (kernel_size < 0) {
        !           184:             fprintf(stderr, "qemu: could not load kernel '%s'\n",
        !           185:                     kernel_filename);
        !           186:             exit(1);
        !           187:         }
        !           188:         if (bios_size <= 0) {
        !           189:             /* If there is no bios/monitor, start the application.  */
        !           190:             env->pc = entry;
        !           191:             env->npc = entry + 4;
        !           192:             reset_info->entry = entry;
        !           193:         }
        !           194:     }
        !           195: 
        !           196:     /* Allocate timers */
        !           197:     grlib_gptimer_create(0x80000300, 2, CPU_CLK, cpu_irqs, 6);
        !           198: 
        !           199:     /* Allocate uart */
        !           200:     if (serial_hds[0]) {
        !           201:         grlib_apbuart_create(0x80000100, serial_hds[0], cpu_irqs[3]);
        !           202:     }
        !           203: }
        !           204: 
        !           205: QEMUMachine leon3_generic_machine = {
        !           206:     .name     = "leon3_generic",
        !           207:     .desc     = "Leon-3 generic",
        !           208:     .init     = leon3_generic_hw_init,
        !           209:     .use_scsi = 0,
        !           210: };
        !           211: 
        !           212: static void leon3_machine_init(void)
        !           213: {
        !           214:     qemu_register_machine(&leon3_generic_machine);
        !           215: }
        !           216: 
        !           217: machine_init(leon3_machine_init);

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