A lot of real world LEON3 systems are shipped with the GRMON boot loader. This boot loader initializes the stack pointer with the end of RAM address. The application can use this to detect the RAM size of a particular board variant. Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de> Reviewed-by: Fabien Chouteau <chouteau@adacore.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
231 lines
6.9 KiB
C
231 lines
6.9 KiB
C
/*
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* QEMU Leon3 System Emulator
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*
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* Copyright (c) 2010-2011 AdaCore
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/hw.h"
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#include "qemu/timer.h"
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#include "hw/ptimer.h"
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#include "sysemu/char.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/qtest.h"
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#include "hw/boards.h"
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#include "hw/loader.h"
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#include "elf.h"
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#include "trace.h"
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#include "exec/address-spaces.h"
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#include "hw/sparc/grlib.h"
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/* Default system clock. */
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#define CPU_CLK (40 * 1000 * 1000)
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#define PROM_FILENAME "u-boot.bin"
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#define MAX_PILS 16
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typedef struct ResetData {
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SPARCCPU *cpu;
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uint32_t entry; /* save kernel entry in case of reset */
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target_ulong sp; /* initial stack pointer */
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} ResetData;
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static void main_cpu_reset(void *opaque)
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{
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ResetData *s = (ResetData *)opaque;
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CPUState *cpu = CPU(s->cpu);
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CPUSPARCState *env = &s->cpu->env;
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cpu_reset(cpu);
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cpu->halted = 0;
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env->pc = s->entry;
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env->npc = s->entry + 4;
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env->regbase[6] = s->sp;
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}
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void leon3_irq_ack(void *irq_manager, int intno)
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{
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grlib_irqmp_ack((DeviceState *)irq_manager, intno);
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}
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static void leon3_set_pil_in(void *opaque, uint32_t pil_in)
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{
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CPUSPARCState *env = (CPUSPARCState *)opaque;
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CPUState *cs;
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assert(env != NULL);
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env->pil_in = pil_in;
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if (env->pil_in && (env->interrupt_index == 0 ||
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(env->interrupt_index & ~15) == TT_EXTINT)) {
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unsigned int i;
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for (i = 15; i > 0; i--) {
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if (env->pil_in & (1 << i)) {
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int old_interrupt = env->interrupt_index;
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env->interrupt_index = TT_EXTINT | i;
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if (old_interrupt != env->interrupt_index) {
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cs = CPU(sparc_env_get_cpu(env));
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trace_leon3_set_irq(i);
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cpu_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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break;
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}
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}
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} else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
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cs = CPU(sparc_env_get_cpu(env));
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trace_leon3_reset_irq(env->interrupt_index & 15);
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env->interrupt_index = 0;
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cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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}
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static void leon3_generic_hw_init(QEMUMachineInitArgs *args)
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{
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ram_addr_t ram_size = args->ram_size;
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const char *cpu_model = args->cpu_model;
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const char *kernel_filename = args->kernel_filename;
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SPARCCPU *cpu;
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CPUSPARCState *env;
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MemoryRegion *address_space_mem = get_system_memory();
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MemoryRegion *ram = g_new(MemoryRegion, 1);
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MemoryRegion *prom = g_new(MemoryRegion, 1);
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int ret;
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char *filename;
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qemu_irq *cpu_irqs = NULL;
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int bios_size;
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int prom_size;
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ResetData *reset_info;
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/* Init CPU */
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if (!cpu_model) {
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cpu_model = "LEON3";
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}
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cpu = cpu_sparc_init(cpu_model);
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if (cpu == NULL) {
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fprintf(stderr, "qemu: Unable to find Sparc CPU definition\n");
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exit(1);
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}
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env = &cpu->env;
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cpu_sparc_set_id(env, 0);
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/* Reset data */
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reset_info = g_malloc0(sizeof(ResetData));
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reset_info->cpu = cpu;
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reset_info->sp = 0x40000000 + ram_size;
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qemu_register_reset(main_cpu_reset, reset_info);
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/* Allocate IRQ manager */
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grlib_irqmp_create(0x80000200, env, &cpu_irqs, MAX_PILS, &leon3_set_pil_in);
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env->qemu_irq_ack = leon3_irq_manager;
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/* Allocate RAM */
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if ((uint64_t)ram_size > (1UL << 30)) {
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fprintf(stderr,
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"qemu: Too much memory for this machine: %d, maximum 1G\n",
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(unsigned int)(ram_size / (1024 * 1024)));
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exit(1);
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}
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memory_region_init_ram(ram, NULL, "leon3.ram", ram_size);
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vmstate_register_ram_global(ram);
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memory_region_add_subregion(address_space_mem, 0x40000000, ram);
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/* Allocate BIOS */
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prom_size = 8 * 1024 * 1024; /* 8Mb */
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memory_region_init_ram(prom, NULL, "Leon3.bios", prom_size);
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vmstate_register_ram_global(prom);
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memory_region_set_readonly(prom, true);
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memory_region_add_subregion(address_space_mem, 0x00000000, prom);
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/* Load boot prom */
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if (bios_name == NULL) {
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bios_name = PROM_FILENAME;
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}
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filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
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bios_size = get_image_size(filename);
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if (bios_size > prom_size) {
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fprintf(stderr, "qemu: could not load prom '%s': file too big\n",
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filename);
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exit(1);
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}
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if (bios_size > 0) {
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ret = load_image_targphys(filename, 0x00000000, bios_size);
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if (ret < 0 || ret > prom_size) {
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fprintf(stderr, "qemu: could not load prom '%s'\n", filename);
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exit(1);
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}
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} else if (kernel_filename == NULL && !qtest_enabled()) {
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fprintf(stderr, "Can't read bios image %s\n", filename);
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exit(1);
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}
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/* Can directly load an application. */
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if (kernel_filename != NULL) {
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long kernel_size;
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uint64_t entry;
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kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
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1 /* big endian */, ELF_MACHINE, 0);
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if (kernel_size < 0) {
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fprintf(stderr, "qemu: could not load kernel '%s'\n",
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kernel_filename);
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exit(1);
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}
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if (bios_size <= 0) {
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/* If there is no bios/monitor, start the application. */
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env->pc = entry;
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env->npc = entry + 4;
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reset_info->entry = entry;
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}
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}
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/* Allocate timers */
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grlib_gptimer_create(0x80000300, 2, CPU_CLK, cpu_irqs, 6);
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/* Allocate uart */
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if (serial_hds[0]) {
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grlib_apbuart_create(0x80000100, serial_hds[0], cpu_irqs[3]);
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}
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}
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static QEMUMachine leon3_generic_machine = {
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.name = "leon3_generic",
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.desc = "Leon-3 generic",
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.init = leon3_generic_hw_init,
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};
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static void leon3_machine_init(void)
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{
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qemu_register_machine(&leon3_generic_machine);
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}
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machine_init(leon3_machine_init);
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