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qemu/hw/riscv/opentitan.c
Alistair Francis 38bc4e34f2 hw/riscv: Load the kernel after the firmware 
Instead of loading the kernel at a hardcoded start address, let's load
the kernel at the next aligned address after the end of the firmware.

This should have no impact for current users of OpenSBI, but will
allow loading a noMMU kernel at the start of memory.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
Message-id: 46c00c4f15b42feb792090e3d74359e180a6d954.1602634524.git.alistair.francis@wdc.com
2020-10-22 12:00:22 -07:00

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/*
* QEMU RISC-V Board Compatible with OpenTitan FPGA platform
*
* Copyright (c) 2020 Western Digital
*
* Provides a board compatible with the OpenTitan FPGA platform:
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/riscv/opentitan.h"
#include "qapi/error.h"
#include "hw/boards.h"
#include "hw/misc/unimp.h"
#include "hw/riscv/boot.h"
#include "exec/address-spaces.h"
#include "qemu/units.h"
#include "sysemu/sysemu.h"
static const struct MemmapEntry {
hwaddr base;
hwaddr size;
} ibex_memmap[] = {
[IBEX_DEV_ROM] = { 0x00008000, 16 * KiB },
[IBEX_DEV_RAM] = { 0x10000000, 0x10000 },
[IBEX_DEV_FLASH] = { 0x20000000, 0x80000 },
[IBEX_DEV_UART] = { 0x40000000, 0x10000 },
[IBEX_DEV_GPIO] = { 0x40010000, 0x10000 },
[IBEX_DEV_SPI] = { 0x40020000, 0x10000 },
[IBEX_DEV_FLASH_CTRL] = { 0x40030000, 0x10000 },
[IBEX_DEV_PINMUX] = { 0x40070000, 0x10000 },
[IBEX_DEV_RV_TIMER] = { 0x40080000, 0x10000 },
[IBEX_DEV_PLIC] = { 0x40090000, 0x10000 },
[IBEX_DEV_PWRMGR] = { 0x400A0000, 0x10000 },
[IBEX_DEV_RSTMGR] = { 0x400B0000, 0x10000 },
[IBEX_DEV_CLKMGR] = { 0x400C0000, 0x10000 },
[IBEX_DEV_AES] = { 0x40110000, 0x10000 },
[IBEX_DEV_HMAC] = { 0x40120000, 0x10000 },
[IBEX_DEV_ALERT_HANDLER] = { 0x40130000, 0x10000 },
[IBEX_DEV_NMI_GEN] = { 0x40140000, 0x10000 },
[IBEX_DEV_USBDEV] = { 0x40150000, 0x10000 },
[IBEX_DEV_PADCTRL] = { 0x40160000, 0x10000 }
};
static void opentitan_board_init(MachineState *machine)
{
const struct MemmapEntry *memmap = ibex_memmap;
OpenTitanState *s = g_new0(OpenTitanState, 1);
MemoryRegion *sys_mem = get_system_memory();
MemoryRegion *main_mem = g_new(MemoryRegion, 1);
/* Initialize SoC */
object_initialize_child(OBJECT(machine), "soc", &s->soc,
TYPE_RISCV_IBEX_SOC);
qdev_realize(DEVICE(&s->soc), NULL, &error_abort);
memory_region_init_ram(main_mem, NULL, "riscv.lowrisc.ibex.ram",
memmap[IBEX_DEV_RAM].size, &error_fatal);
memory_region_add_subregion(sys_mem,
memmap[IBEX_DEV_RAM].base, main_mem);
if (machine->firmware) {
riscv_load_firmware(machine->firmware, memmap[IBEX_DEV_RAM].base, NULL);
}
if (machine->kernel_filename) {
riscv_load_kernel(machine->kernel_filename,
memmap[IBEX_DEV_RAM].base, NULL);
}
}
static void opentitan_machine_init(MachineClass *mc)
{
mc->desc = "RISC-V Board compatible with OpenTitan";
mc->init = opentitan_board_init;
mc->max_cpus = 1;
mc->default_cpu_type = TYPE_RISCV_CPU_IBEX;
}
DEFINE_MACHINE("opentitan", opentitan_machine_init)
static void lowrisc_ibex_soc_init(Object *obj)
{
LowRISCIbexSoCState *s = RISCV_IBEX_SOC(obj);
object_initialize_child(obj, "cpus", &s->cpus, TYPE_RISCV_HART_ARRAY);
object_initialize_child(obj, "plic", &s->plic, TYPE_IBEX_PLIC);
object_initialize_child(obj, "uart", &s->uart, TYPE_IBEX_UART);
}
static void lowrisc_ibex_soc_realize(DeviceState *dev_soc, Error **errp)
{
const struct MemmapEntry *memmap = ibex_memmap;
MachineState *ms = MACHINE(qdev_get_machine());
LowRISCIbexSoCState *s = RISCV_IBEX_SOC(dev_soc);
MemoryRegion *sys_mem = get_system_memory();
object_property_set_str(OBJECT(&s->cpus), "cpu-type", ms->cpu_type,
&error_abort);
object_property_set_int(OBJECT(&s->cpus), "num-harts", ms->smp.cpus,
&error_abort);
object_property_set_int(OBJECT(&s->cpus), "resetvec", 0x8090, &error_abort);
sysbus_realize(SYS_BUS_DEVICE(&s->cpus), &error_abort);
/* Boot ROM */
memory_region_init_rom(&s->rom, OBJECT(dev_soc), "riscv.lowrisc.ibex.rom",
memmap[IBEX_DEV_ROM].size, &error_fatal);
memory_region_add_subregion(sys_mem,
memmap[IBEX_DEV_ROM].base, &s->rom);
/* Flash memory */
memory_region_init_rom(&s->flash_mem, OBJECT(dev_soc), "riscv.lowrisc.ibex.flash",
memmap[IBEX_DEV_FLASH].size, &error_fatal);
memory_region_add_subregion(sys_mem, memmap[IBEX_DEV_FLASH].base,
&s->flash_mem);
/* PLIC */
if (!sysbus_realize(SYS_BUS_DEVICE(&s->plic), errp)) {
return;
}
sysbus_mmio_map(SYS_BUS_DEVICE(&s->plic), 0, memmap[IBEX_DEV_PLIC].base);
/* UART */
qdev_prop_set_chr(DEVICE(&(s->uart)), "chardev", serial_hd(0));
if (!sysbus_realize(SYS_BUS_DEVICE(&s->uart), errp)) {
return;
}
sysbus_mmio_map(SYS_BUS_DEVICE(&s->uart), 0, memmap[IBEX_DEV_UART].base);
sysbus_connect_irq(SYS_BUS_DEVICE(&s->uart),
0, qdev_get_gpio_in(DEVICE(&s->plic),
IBEX_UART_TX_WATERMARK_IRQ));
sysbus_connect_irq(SYS_BUS_DEVICE(&s->uart),
1, qdev_get_gpio_in(DEVICE(&s->plic),
IBEX_UART_RX_WATERMARK_IRQ));
sysbus_connect_irq(SYS_BUS_DEVICE(&s->uart),
2, qdev_get_gpio_in(DEVICE(&s->plic),
IBEX_UART_TX_EMPTY_IRQ));
sysbus_connect_irq(SYS_BUS_DEVICE(&s->uart),
3, qdev_get_gpio_in(DEVICE(&s->plic),
IBEX_UART_RX_OVERFLOW_IRQ));
create_unimplemented_device("riscv.lowrisc.ibex.gpio",
memmap[IBEX_DEV_GPIO].base, memmap[IBEX_DEV_GPIO].size);
create_unimplemented_device("riscv.lowrisc.ibex.spi",
memmap[IBEX_DEV_SPI].base, memmap[IBEX_DEV_SPI].size);
create_unimplemented_device("riscv.lowrisc.ibex.flash_ctrl",
memmap[IBEX_DEV_FLASH_CTRL].base, memmap[IBEX_DEV_FLASH_CTRL].size);
create_unimplemented_device("riscv.lowrisc.ibex.rv_timer",
memmap[IBEX_DEV_RV_TIMER].base, memmap[IBEX_DEV_RV_TIMER].size);
create_unimplemented_device("riscv.lowrisc.ibex.pwrmgr",
memmap[IBEX_DEV_PWRMGR].base, memmap[IBEX_DEV_PWRMGR].size);
create_unimplemented_device("riscv.lowrisc.ibex.rstmgr",
memmap[IBEX_DEV_RSTMGR].base, memmap[IBEX_DEV_RSTMGR].size);
create_unimplemented_device("riscv.lowrisc.ibex.clkmgr",
memmap[IBEX_DEV_CLKMGR].base, memmap[IBEX_DEV_CLKMGR].size);
create_unimplemented_device("riscv.lowrisc.ibex.aes",
memmap[IBEX_DEV_AES].base, memmap[IBEX_DEV_AES].size);
create_unimplemented_device("riscv.lowrisc.ibex.hmac",
memmap[IBEX_DEV_HMAC].base, memmap[IBEX_DEV_HMAC].size);
create_unimplemented_device("riscv.lowrisc.ibex.pinmux",
memmap[IBEX_DEV_PINMUX].base, memmap[IBEX_DEV_PINMUX].size);
create_unimplemented_device("riscv.lowrisc.ibex.alert_handler",
memmap[IBEX_DEV_ALERT_HANDLER].base, memmap[IBEX_DEV_ALERT_HANDLER].size);
create_unimplemented_device("riscv.lowrisc.ibex.nmi_gen",
memmap[IBEX_DEV_NMI_GEN].base, memmap[IBEX_DEV_NMI_GEN].size);
create_unimplemented_device("riscv.lowrisc.ibex.usbdev",
memmap[IBEX_DEV_USBDEV].base, memmap[IBEX_DEV_USBDEV].size);
create_unimplemented_device("riscv.lowrisc.ibex.padctrl",
memmap[IBEX_DEV_PADCTRL].base, memmap[IBEX_DEV_PADCTRL].size);
}
static void lowrisc_ibex_soc_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = lowrisc_ibex_soc_realize;
/* Reason: Uses serial_hds in realize function, thus can't be used twice */
dc->user_creatable = false;
}
static const TypeInfo lowrisc_ibex_soc_type_info = {
.name = TYPE_RISCV_IBEX_SOC,
.parent = TYPE_DEVICE,
.instance_size = sizeof(LowRISCIbexSoCState),
.instance_init = lowrisc_ibex_soc_init,
.class_init = lowrisc_ibex_soc_class_init,
};
static void lowrisc_ibex_soc_register_types(void)
{
type_register_static(&lowrisc_ibex_soc_type_info);
}
type_init(lowrisc_ibex_soc_register_types)
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