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xemu/hw/riscv/sifive_e.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 SiFive Freedom E SDK
*
* Copyright (c) 2017 SiFive, Inc.
*
* Provides a board compatible with the SiFive Freedom E SDK:
*
* 0) UART
* 1) CLINT (Core Level Interruptor)
* 2) PLIC (Platform Level Interrupt Controller)
* 3) PRCI (Power, Reset, Clock, Interrupt)
* 4) Registers emulated as RAM: AON, GPIO, QSPI, PWM
* 5) Flash memory emulated as RAM
*
* The Mask ROM reset vector jumps to the flash payload at 0x2040_0000.
* The OTP ROM and Flash boot code will be emulated in a future version.
*
* 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 "qemu/log.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/sysbus.h"
#include "hw/char/serial.h"
#include "hw/misc/unimp.h"
#include "target/riscv/cpu.h"
#include "hw/riscv/riscv_hart.h"
#include "hw/riscv/sifive_e.h"
#include "hw/riscv/boot.h"
#include "hw/char/sifive_uart.h"
#include "hw/intc/sifive_clint.h"
#include "hw/intc/sifive_plic.h"
#include "hw/misc/sifive_e_prci.h"
#include "chardev/char.h"
#include "sysemu/arch_init.h"
#include "sysemu/sysemu.h"
#include "exec/address-spaces.h"
static const struct MemmapEntry {
hwaddr base;
hwaddr size;
} sifive_e_memmap[] = {
[SIFIVE_E_DEV_DEBUG] = { 0x0, 0x1000 },
[SIFIVE_E_DEV_MROM] = { 0x1000, 0x2000 },
[SIFIVE_E_DEV_OTP] = { 0x20000, 0x2000 },
[SIFIVE_E_DEV_CLINT] = { 0x2000000, 0x10000 },
[SIFIVE_E_DEV_PLIC] = { 0xc000000, 0x4000000 },
[SIFIVE_E_DEV_AON] = { 0x10000000, 0x8000 },
[SIFIVE_E_DEV_PRCI] = { 0x10008000, 0x8000 },
[SIFIVE_E_DEV_OTP_CTRL] = { 0x10010000, 0x1000 },
[SIFIVE_E_DEV_GPIO0] = { 0x10012000, 0x1000 },
[SIFIVE_E_DEV_UART0] = { 0x10013000, 0x1000 },
[SIFIVE_E_DEV_QSPI0] = { 0x10014000, 0x1000 },
[SIFIVE_E_DEV_PWM0] = { 0x10015000, 0x1000 },
[SIFIVE_E_DEV_UART1] = { 0x10023000, 0x1000 },
[SIFIVE_E_DEV_QSPI1] = { 0x10024000, 0x1000 },
[SIFIVE_E_DEV_PWM1] = { 0x10025000, 0x1000 },
[SIFIVE_E_DEV_QSPI2] = { 0x10034000, 0x1000 },
[SIFIVE_E_DEV_PWM2] = { 0x10035000, 0x1000 },
[SIFIVE_E_DEV_XIP] = { 0x20000000, 0x20000000 },
[SIFIVE_E_DEV_DTIM] = { 0x80000000, 0x4000 }
};
static void sifive_e_machine_init(MachineState *machine)
{
const struct MemmapEntry *memmap = sifive_e_memmap;
SiFiveEState *s = RISCV_E_MACHINE(machine);
MemoryRegion *sys_mem = get_system_memory();
MemoryRegion *main_mem = g_new(MemoryRegion, 1);
int i;
/* Initialize SoC */
object_initialize_child(OBJECT(machine), "soc", &s->soc, TYPE_RISCV_E_SOC);
qdev_realize(DEVICE(&s->soc), NULL, &error_abort);
/* Data Tightly Integrated Memory */
memory_region_init_ram(main_mem, NULL, "riscv.sifive.e.ram",
memmap[SIFIVE_E_DEV_DTIM].size, &error_fatal);
memory_region_add_subregion(sys_mem,
memmap[SIFIVE_E_DEV_DTIM].base, main_mem);
/* Mask ROM reset vector */
uint32_t reset_vec[4];
if (s->revb) {
reset_vec[1] = 0x200102b7; /* 0x1004: lui t0,0x20010 */
} else {
reset_vec[1] = 0x204002b7; /* 0x1004: lui t0,0x20400 */
}
reset_vec[2] = 0x00028067; /* 0x1008: jr t0 */
reset_vec[0] = reset_vec[3] = 0;
/* copy in the reset vector in little_endian byte order */
for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
reset_vec[i] = cpu_to_le32(reset_vec[i]);
}
rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
memmap[SIFIVE_E_DEV_MROM].base, &address_space_memory);
if (machine->kernel_filename) {
riscv_load_kernel(machine->kernel_filename,
memmap[SIFIVE_E_DEV_DTIM].base, NULL);
}
}
static bool sifive_e_machine_get_revb(Object *obj, Error **errp)
{
SiFiveEState *s = RISCV_E_MACHINE(obj);
return s->revb;
}
static void sifive_e_machine_set_revb(Object *obj, bool value, Error **errp)
{
SiFiveEState *s = RISCV_E_MACHINE(obj);
s->revb = value;
}
static void sifive_e_machine_instance_init(Object *obj)
{
SiFiveEState *s = RISCV_E_MACHINE(obj);
s->revb = false;
}
static void sifive_e_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
mc->desc = "RISC-V Board compatible with SiFive E SDK";
mc->init = sifive_e_machine_init;
mc->max_cpus = 1;
mc->default_cpu_type = SIFIVE_E_CPU;
object_class_property_add_bool(oc, "revb", sifive_e_machine_get_revb,
sifive_e_machine_set_revb);
object_class_property_set_description(oc, "revb",
"Set on to tell QEMU that it should model "
"the revB HiFive1 board");
}
static const TypeInfo sifive_e_machine_typeinfo = {
.name = MACHINE_TYPE_NAME("sifive_e"),
.parent = TYPE_MACHINE,
.class_init = sifive_e_machine_class_init,
.instance_init = sifive_e_machine_instance_init,
.instance_size = sizeof(SiFiveEState),
};
static void sifive_e_machine_init_register_types(void)
{
type_register_static(&sifive_e_machine_typeinfo);
}
type_init(sifive_e_machine_init_register_types)
static void sifive_e_soc_init(Object *obj)
{
MachineState *ms = MACHINE(qdev_get_machine());
SiFiveESoCState *s = RISCV_E_SOC(obj);
object_initialize_child(obj, "cpus", &s->cpus, TYPE_RISCV_HART_ARRAY);
object_property_set_int(OBJECT(&s->cpus), "num-harts", ms->smp.cpus,
&error_abort);
object_property_set_int(OBJECT(&s->cpus), "resetvec", 0x1004, &error_abort);
object_initialize_child(obj, "riscv.sifive.e.gpio0", &s->gpio,
TYPE_SIFIVE_GPIO);
}
static void sifive_e_soc_realize(DeviceState *dev, Error **errp)
{
MachineState *ms = MACHINE(qdev_get_machine());
const struct MemmapEntry *memmap = sifive_e_memmap;
SiFiveESoCState *s = RISCV_E_SOC(dev);
MemoryRegion *sys_mem = get_system_memory();
object_property_set_str(OBJECT(&s->cpus), "cpu-type", ms->cpu_type,
&error_abort);
sysbus_realize(SYS_BUS_DEVICE(&s->cpus), &error_abort);
/* Mask ROM */
memory_region_init_rom(&s->mask_rom, OBJECT(dev), "riscv.sifive.e.mrom",
memmap[SIFIVE_E_DEV_MROM].size, &error_fatal);
memory_region_add_subregion(sys_mem,
memmap[SIFIVE_E_DEV_MROM].base, &s->mask_rom);
/* MMIO */
s->plic = sifive_plic_create(memmap[SIFIVE_E_DEV_PLIC].base,
(char *)SIFIVE_E_PLIC_HART_CONFIG, 0,
SIFIVE_E_PLIC_NUM_SOURCES,
SIFIVE_E_PLIC_NUM_PRIORITIES,
SIFIVE_E_PLIC_PRIORITY_BASE,
SIFIVE_E_PLIC_PENDING_BASE,
SIFIVE_E_PLIC_ENABLE_BASE,
SIFIVE_E_PLIC_ENABLE_STRIDE,
SIFIVE_E_PLIC_CONTEXT_BASE,
SIFIVE_E_PLIC_CONTEXT_STRIDE,
memmap[SIFIVE_E_DEV_PLIC].size);
sifive_clint_create(memmap[SIFIVE_E_DEV_CLINT].base,
memmap[SIFIVE_E_DEV_CLINT].size, 0, ms->smp.cpus,
SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE,
SIFIVE_CLINT_TIMEBASE_FREQ, false);
create_unimplemented_device("riscv.sifive.e.aon",
memmap[SIFIVE_E_DEV_AON].base, memmap[SIFIVE_E_DEV_AON].size);
sifive_e_prci_create(memmap[SIFIVE_E_DEV_PRCI].base);
/* GPIO */
if (!sysbus_realize(SYS_BUS_DEVICE(&s->gpio), errp)) {
return;
}
/* Map GPIO registers */
sysbus_mmio_map(SYS_BUS_DEVICE(&s->gpio), 0, memmap[SIFIVE_E_DEV_GPIO0].base);
/* Pass all GPIOs to the SOC layer so they are available to the board */
qdev_pass_gpios(DEVICE(&s->gpio), dev, NULL);
/* Connect GPIO interrupts to the PLIC */
for (int i = 0; i < 32; i++) {
sysbus_connect_irq(SYS_BUS_DEVICE(&s->gpio), i,
qdev_get_gpio_in(DEVICE(s->plic),
SIFIVE_E_GPIO0_IRQ0 + i));
}
sifive_uart_create(sys_mem, memmap[SIFIVE_E_DEV_UART0].base,
serial_hd(0), qdev_get_gpio_in(DEVICE(s->plic), SIFIVE_E_UART0_IRQ));
create_unimplemented_device("riscv.sifive.e.qspi0",
memmap[SIFIVE_E_DEV_QSPI0].base, memmap[SIFIVE_E_DEV_QSPI0].size);
create_unimplemented_device("riscv.sifive.e.pwm0",
memmap[SIFIVE_E_DEV_PWM0].base, memmap[SIFIVE_E_DEV_PWM0].size);
sifive_uart_create(sys_mem, memmap[SIFIVE_E_DEV_UART1].base,
serial_hd(1), qdev_get_gpio_in(DEVICE(s->plic), SIFIVE_E_UART1_IRQ));
create_unimplemented_device("riscv.sifive.e.qspi1",
memmap[SIFIVE_E_DEV_QSPI1].base, memmap[SIFIVE_E_DEV_QSPI1].size);
create_unimplemented_device("riscv.sifive.e.pwm1",
memmap[SIFIVE_E_DEV_PWM1].base, memmap[SIFIVE_E_DEV_PWM1].size);
create_unimplemented_device("riscv.sifive.e.qspi2",
memmap[SIFIVE_E_DEV_QSPI2].base, memmap[SIFIVE_E_DEV_QSPI2].size);
create_unimplemented_device("riscv.sifive.e.pwm2",
memmap[SIFIVE_E_DEV_PWM2].base, memmap[SIFIVE_E_DEV_PWM2].size);
/* Flash memory */
memory_region_init_rom(&s->xip_mem, OBJECT(dev), "riscv.sifive.e.xip",
memmap[SIFIVE_E_DEV_XIP].size, &error_fatal);
memory_region_add_subregion(sys_mem, memmap[SIFIVE_E_DEV_XIP].base,
&s->xip_mem);
}
static void sifive_e_soc_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = sifive_e_soc_realize;
/* Reason: Uses serial_hds in realize function, thus can't be used twice */
dc->user_creatable = false;
}
static const TypeInfo sifive_e_soc_type_info = {
.name = TYPE_RISCV_E_SOC,
.parent = TYPE_DEVICE,
.instance_size = sizeof(SiFiveESoCState),
.instance_init = sifive_e_soc_init,
.class_init = sifive_e_soc_class_init,
};
static void sifive_e_soc_register_types(void)
{
type_register_static(&sifive_e_soc_type_info);
}
type_init(sifive_e_soc_register_types)
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