From: Sarah Harris <s.e.har...@kent.ac.uk> A simple board setup that configures an AVR CPU to run a given firmware image. This is all that's useful to implement without peripheral emulation as AVR CPUs include a lot of on-board peripherals.
Signed-off-by: Sarah Harris <s.e.har...@kent.ac.uk> Signed-off-by: Michael Rolnik <mrol...@gmail.com> --- hw/Kconfig | 1 + hw/avr/Kconfig | 4 + hw/avr/Makefile.objs | 1 + hw/avr/sample.c | 177 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 183 insertions(+) create mode 100644 hw/avr/Kconfig create mode 100644 hw/avr/Makefile.objs create mode 100644 hw/avr/sample.c diff --git a/hw/Kconfig b/hw/Kconfig index 195f541e50..1f25636855 100644 --- a/hw/Kconfig +++ b/hw/Kconfig @@ -42,6 +42,7 @@ source watchdog/Kconfig # arch Kconfig source arm/Kconfig source alpha/Kconfig +source avr/Kconfig source cris/Kconfig source hppa/Kconfig source i386/Kconfig diff --git a/hw/avr/Kconfig b/hw/avr/Kconfig new file mode 100644 index 0000000000..c6ca8fe775 --- /dev/null +++ b/hw/avr/Kconfig @@ -0,0 +1,4 @@ +config AVR_SAMPLE + bool + select AVR_TIMER16 + select AVR_USART diff --git a/hw/avr/Makefile.objs b/hw/avr/Makefile.objs new file mode 100644 index 0000000000..626b7064b3 --- /dev/null +++ b/hw/avr/Makefile.objs @@ -0,0 +1 @@ +obj-y += sample.o diff --git a/hw/avr/sample.c b/hw/avr/sample.c new file mode 100644 index 0000000000..21b384b3b3 --- /dev/null +++ b/hw/avr/sample.c @@ -0,0 +1,177 @@ +/* + * QEMU AVR CPU + * + * Copyright (c) 2016 Michael Rolnik + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * <http://www.gnu.org/licenses/lgpl-2.1.html> + */ + +/* + * NOTE: + * This is not a real AVR board, this is an example! + * The CPU is an approximation of an ATmega2560, but is missing various + * built-in peripherals. + * + * This example board loads provided binary file into flash memory and + * executes it from 0x00000000 address in the code memory space. + * + * Currently used for AVR CPU validation + * + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu-common.h" +#include "cpu.h" +#include "hw/hw.h" +#include "sysemu/sysemu.h" +#include "sysemu/qtest.h" +#include "ui/console.h" +#include "hw/boards.h" +#include "hw/loader.h" +#include "qemu/error-report.h" +#include "exec/address-spaces.h" +#include "include/hw/sysbus.h" +#include "include/hw/char/avr_usart.h" +#include "include/hw/timer/avr_timer16.h" +#include "elf.h" + +#define SIZE_FLASH 0x00040000 +#define SIZE_SRAM 0x00002200 +/* + * Size of additional "external" memory, as if the AVR were configured to use + * an external RAM chip. + * Note that the configuration registers that normally enable this feature are + * unimplemented. + */ +#define SIZE_EXMEM 0x00000000 + +/* Offsets of periphals in emulated memory space (i.e. not host addresses) */ +#define PRR0 0x64 +#define PRR1 0x65 +#define USART_BASE 0xc0 +#define USART_PRR PRR0 +#define USART_PRR_MASK 0b00000010 +#define TIMER1_BASE 0x80 +#define TIMER1_IMSK_BASE 0x6f +#define TIMER1_IFR_BASE 0x36 +#define TIMER1_PRR PRR0 +#define TIMER1_PRR_MASK 0b01000000 + +/* Interrupt numbers used by peripherals */ +#define TIMER1_CAPT_IRQ 15 +#define TIMER1_COMPA_IRQ 16 +#define TIMER1_COMPB_IRQ 17 +#define TIMER1_COMPC_IRQ 18 +#define TIMER1_OVF_IRQ 19 + +static void sample_init(MachineState *machine) +{ + MemoryRegion *address_space_mem; + MemoryRegion *ram; + MemoryRegion *flash; + AVRCPU *cpu_avr; + const char *firmware = NULL; + const char *filename; + int bytes_loaded; + AVRUsartState *usart0; + AVRTimer16State *timer1; + SysBusDevice *busdev; + + address_space_mem = get_system_memory(); + ram = g_new(MemoryRegion, 1); + flash = g_new(MemoryRegion, 1); + + /* ATmega2560. */ + cpu_avr = AVR_CPU(cpu_create("avr6-avr")); + + memory_region_allocate_system_memory( + ram, NULL, "avr.ram", SIZE_SRAM + SIZE_EXMEM); + memory_region_add_subregion(address_space_mem, OFFSET_DATA, ram); + + memory_region_init_rom(flash, NULL, "avr.flash", SIZE_FLASH, &error_fatal); + memory_region_add_subregion(address_space_mem, OFFSET_CODE, flash); + + /* USART 0 built-in peripheral */ + usart0 = AVR_USART(object_new(TYPE_AVR_USART)); + busdev = SYS_BUS_DEVICE(usart0); + sysbus_mmio_map(busdev, 0, OFFSET_DATA + USART_BASE); + /* + * These IRQ numbers don't match the datasheet because we're counting from + * zero and not including reset. + */ + sysbus_connect_irq(busdev, 0, qdev_get_gpio_in(DEVICE(cpu_avr), 24)); + sysbus_connect_irq(busdev, 1, qdev_get_gpio_in(DEVICE(cpu_avr), 25)); + sysbus_connect_irq(busdev, 2, qdev_get_gpio_in(DEVICE(cpu_avr), 26)); + usart0->prr_address = OFFSET_DATA + PRR0; + usart0->prr_mask = USART_PRR_MASK; + qdev_prop_set_chr(DEVICE(usart0), "chardev", serial_hd(0)); + object_property_set_bool(OBJECT(usart0), true, "realized", &error_fatal); + + /* Timer 1 built-in periphal */ + timer1 = AVR_TIMER16(object_new(TYPE_AVR_TIMER16)); + busdev = SYS_BUS_DEVICE(timer1); + sysbus_mmio_map(busdev, 0, OFFSET_DATA + TIMER1_BASE); + sysbus_mmio_map(busdev, 1, OFFSET_DATA + TIMER1_IMSK_BASE); + sysbus_mmio_map(busdev, 2, OFFSET_DATA + TIMER1_IFR_BASE); + sysbus_connect_irq(busdev, 0, qdev_get_gpio_in( + DEVICE(cpu_avr), TIMER1_CAPT_IRQ)); + sysbus_connect_irq(busdev, 1, qdev_get_gpio_in( + DEVICE(cpu_avr), TIMER1_COMPA_IRQ)); + sysbus_connect_irq(busdev, 2, qdev_get_gpio_in( + DEVICE(cpu_avr), TIMER1_COMPB_IRQ)); + sysbus_connect_irq(busdev, 3, qdev_get_gpio_in( + DEVICE(cpu_avr), TIMER1_COMPC_IRQ)); + sysbus_connect_irq(busdev, 4, qdev_get_gpio_in( + DEVICE(cpu_avr), TIMER1_OVF_IRQ)); + timer1->prr_address = OFFSET_DATA + TIMER1_PRR; + timer1->prr_mask = TIMER1_PRR_MASK; + object_property_set_bool(OBJECT(timer1), true, "realized", &error_fatal); + + /* Load firmware (contents of flash) trying to auto-detect format */ + firmware = machine->firmware; + if (firmware != NULL) { + filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware); + if (filename == NULL) { + error_report("Unable to find %s", firmware); + exit(1); + } + + bytes_loaded = load_elf( + filename, NULL, NULL, NULL, NULL, NULL, NULL, 0, EM_NONE, 0, 0); + if (bytes_loaded < 0) { + error_report( + "Unable to load %s as ELF, trying again as raw binary", + firmware); + bytes_loaded = load_image_targphys( + filename, OFFSET_CODE, SIZE_FLASH); + } + if (bytes_loaded < 0) { + error_report( + "Unable to load firmware image %s as ELF or raw binary", + firmware); + exit(1); + } + } +} + +static void sample_machine_init(MachineClass *mc) +{ + mc->desc = "AVR sample/example board"; + mc->init = sample_init; + mc->is_default = 1; +} + +DEFINE_MACHINE("sample", sample_machine_init) -- 2.18.0
