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qemu-e2k/hw/m68k/virt.c
Jason A. Donenfeld 1ffd007c9c m68k/virt: do not re-randomize RNG seed on snapshot load 
Snapshot loading is supposed to be deterministic, so we shouldn't
re-randomize the various seeds used.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-id: 20221025004327.568476-7-Jason@zx2c4.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2022-10-27 11:34:31 +01:00

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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* QEMU Vitual M68K Machine
*
* (c) 2020 Laurent Vivier <laurent@vivier.eu>
*
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/guest-random.h"
#include "sysemu/sysemu.h"
#include "cpu.h"
#include "hw/boards.h"
#include "hw/qdev-properties.h"
#include "elf.h"
#include "hw/loader.h"
#include "ui/console.h"
#include "hw/sysbus.h"
#include "standard-headers/asm-m68k/bootinfo.h"
#include "standard-headers/asm-m68k/bootinfo-virt.h"
#include "bootinfo.h"
#include "net/net.h"
#include "qapi/error.h"
#include "sysemu/qtest.h"
#include "sysemu/runstate.h"
#include "sysemu/reset.h"
#include "hw/intc/m68k_irqc.h"
#include "hw/misc/virt_ctrl.h"
#include "hw/char/goldfish_tty.h"
#include "hw/rtc/goldfish_rtc.h"
#include "hw/intc/goldfish_pic.h"
#include "hw/virtio/virtio-mmio.h"
#include "hw/virtio/virtio-blk.h"
/*
* 6 goldfish-pic for CPU IRQ #1 to IRQ #6
* CPU IRQ #1 -> PIC #1
* IRQ #1 to IRQ #31 -> unused
* IRQ #32 -> goldfish-tty
* CPU IRQ #2 -> PIC #2
* IRQ #1 to IRQ #32 -> virtio-mmio from 1 to 32
* CPU IRQ #3 -> PIC #3
* IRQ #1 to IRQ #32 -> virtio-mmio from 33 to 64
* CPU IRQ #4 -> PIC #4
* IRQ #1 to IRQ #32 -> virtio-mmio from 65 to 96
* CPU IRQ #5 -> PIC #5
* IRQ #1 to IRQ #32 -> virtio-mmio from 97 to 128
* CPU IRQ #6 -> PIC #6
* IRQ #1 -> goldfish-rtc
* IRQ #2 to IRQ #32 -> unused
* CPU IRQ #7 -> NMI
*/
#define PIC_IRQ_BASE(num) (8 + (num - 1) * 32)
#define PIC_IRQ(num, irq) (PIC_IRQ_BASE(num) + irq - 1)
#define PIC_GPIO(pic_irq) (qdev_get_gpio_in(pic_dev[(pic_irq - 8) / 32], \
(pic_irq - 8) % 32))
#define VIRT_GF_PIC_MMIO_BASE 0xff000000 /* MMIO: 0xff000000 - 0xff005fff */
#define VIRT_GF_PIC_IRQ_BASE 1 /* IRQ: #1 -> #6 */
#define VIRT_GF_PIC_NB 6
/* 2 goldfish-rtc (and timer) */
#define VIRT_GF_RTC_MMIO_BASE 0xff006000 /* MMIO: 0xff006000 - 0xff007fff */
#define VIRT_GF_RTC_IRQ_BASE PIC_IRQ(6, 1) /* PIC: #6, IRQ: #1 */
#define VIRT_GF_RTC_NB 2
/* 1 goldfish-tty */
#define VIRT_GF_TTY_MMIO_BASE 0xff008000 /* MMIO: 0xff008000 - 0xff008fff */
#define VIRT_GF_TTY_IRQ_BASE PIC_IRQ(1, 32) /* PIC: #1, IRQ: #32 */
/* 1 virt-ctrl */
#define VIRT_CTRL_MMIO_BASE 0xff009000 /* MMIO: 0xff009000 - 0xff009fff */
#define VIRT_CTRL_IRQ_BASE PIC_IRQ(1, 1) /* PIC: #1, IRQ: #1 */
/*
* virtio-mmio size is 0x200 bytes
* we use 4 goldfish-pic to attach them,
* we can attach 32 virtio devices / goldfish-pic
* -> we can manage 32 * 4 = 128 virtio devices
*/
#define VIRT_VIRTIO_MMIO_BASE 0xff010000 /* MMIO: 0xff010000 - 0xff01ffff */
#define VIRT_VIRTIO_IRQ_BASE PIC_IRQ(2, 1) /* PIC: 2, 3, 4, 5, IRQ: ALL */
typedef struct {
M68kCPU *cpu;
hwaddr initial_pc;
hwaddr initial_stack;
} ResetInfo;
static void main_cpu_reset(void *opaque)
{
ResetInfo *reset_info = opaque;
M68kCPU *cpu = reset_info->cpu;
CPUState *cs = CPU(cpu);
cpu_reset(cs);
cpu->env.aregs[7] = reset_info->initial_stack;
cpu->env.pc = reset_info->initial_pc;
}
static void rerandomize_rng_seed(void *opaque)
{
struct bi_record *rng_seed = opaque;
qemu_guest_getrandom_nofail((void *)rng_seed->data + 2,
be16_to_cpu(*(uint16_t *)rng_seed->data));
}
static void virt_init(MachineState *machine)
{
M68kCPU *cpu = NULL;
int32_t kernel_size;
uint64_t elf_entry;
ram_addr_t initrd_base;
int32_t initrd_size;
ram_addr_t ram_size = machine->ram_size;
const char *kernel_filename = machine->kernel_filename;
const char *initrd_filename = machine->initrd_filename;
const char *kernel_cmdline = machine->kernel_cmdline;
hwaddr parameters_base;
DeviceState *dev;
DeviceState *irqc_dev;
DeviceState *pic_dev[VIRT_GF_PIC_NB];
SysBusDevice *sysbus;
hwaddr io_base;
int i;
ResetInfo *reset_info;
uint8_t rng_seed[32];
if (ram_size > 3399672 * KiB) {
/*
* The physical memory can be up to 4 GiB - 16 MiB, but linux
* kernel crashes after this limit (~ 3.2 GiB)
*/
error_report("Too much memory for this machine: %" PRId64 " KiB, "
"maximum 3399672 KiB", ram_size / KiB);
exit(1);
}
reset_info = g_new0(ResetInfo, 1);
/* init CPUs */
cpu = M68K_CPU(cpu_create(machine->cpu_type));
reset_info->cpu = cpu;
qemu_register_reset(main_cpu_reset, reset_info);
/* RAM */
memory_region_add_subregion(get_system_memory(), 0, machine->ram);
/* IRQ Controller */
irqc_dev = qdev_new(TYPE_M68K_IRQC);
sysbus_realize_and_unref(SYS_BUS_DEVICE(irqc_dev), &error_fatal);
/*
* 6 goldfish-pic
*
* map: 0xff000000 - 0xff006fff = 28 KiB
* IRQ: #1 (lower priority) -> #6 (higher priority)
*
*/
io_base = VIRT_GF_PIC_MMIO_BASE;
for (i = 0; i < VIRT_GF_PIC_NB; i++) {
pic_dev[i] = qdev_new(TYPE_GOLDFISH_PIC);
sysbus = SYS_BUS_DEVICE(pic_dev[i]);
qdev_prop_set_uint8(pic_dev[i], "index", i);
sysbus_realize_and_unref(sysbus, &error_fatal);
sysbus_mmio_map(sysbus, 0, io_base);
sysbus_connect_irq(sysbus, 0, qdev_get_gpio_in(irqc_dev, i));
io_base += 0x1000;
}
/* goldfish-rtc */
io_base = VIRT_GF_RTC_MMIO_BASE;
for (i = 0; i < VIRT_GF_RTC_NB; i++) {
dev = qdev_new(TYPE_GOLDFISH_RTC);
qdev_prop_set_bit(dev, "big-endian", true);
sysbus = SYS_BUS_DEVICE(dev);
sysbus_realize_and_unref(sysbus, &error_fatal);
sysbus_mmio_map(sysbus, 0, io_base);
sysbus_connect_irq(sysbus, 0, PIC_GPIO(VIRT_GF_RTC_IRQ_BASE + i));
io_base += 0x1000;
}
/* goldfish-tty */
dev = qdev_new(TYPE_GOLDFISH_TTY);
sysbus = SYS_BUS_DEVICE(dev);
qdev_prop_set_chr(dev, "chardev", serial_hd(0));
sysbus_realize_and_unref(sysbus, &error_fatal);
sysbus_mmio_map(sysbus, 0, VIRT_GF_TTY_MMIO_BASE);
sysbus_connect_irq(sysbus, 0, PIC_GPIO(VIRT_GF_TTY_IRQ_BASE));
/* virt controller */
dev = qdev_new(TYPE_VIRT_CTRL);
sysbus = SYS_BUS_DEVICE(dev);
sysbus_realize_and_unref(sysbus, &error_fatal);
sysbus_mmio_map(sysbus, 0, VIRT_CTRL_MMIO_BASE);
sysbus_connect_irq(sysbus, 0, PIC_GPIO(VIRT_CTRL_IRQ_BASE));
/* virtio-mmio */
io_base = VIRT_VIRTIO_MMIO_BASE;
for (i = 0; i < 128; i++) {
dev = qdev_new(TYPE_VIRTIO_MMIO);
qdev_prop_set_bit(dev, "force-legacy", false);
sysbus = SYS_BUS_DEVICE(dev);
sysbus_realize_and_unref(sysbus, &error_fatal);
sysbus_connect_irq(sysbus, 0, PIC_GPIO(VIRT_VIRTIO_IRQ_BASE + i));
sysbus_mmio_map(sysbus, 0, io_base);
io_base += 0x200;
}
if (kernel_filename) {
CPUState *cs = CPU(cpu);
uint64_t high;
void *param_blob, *param_ptr, *param_rng_seed;
if (kernel_cmdline) {
param_blob = g_malloc(strlen(kernel_cmdline) + 1024);
} else {
param_blob = g_malloc(1024);
}
kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
&elf_entry, NULL, &high, NULL, 1,
EM_68K, 0, 0);
if (kernel_size < 0) {
error_report("could not load kernel '%s'", kernel_filename);
exit(1);
}
reset_info->initial_pc = elf_entry;
parameters_base = (high + 1) & ~1;
param_ptr = param_blob;
BOOTINFO1(param_ptr, BI_MACHTYPE, MACH_VIRT);
BOOTINFO1(param_ptr, BI_FPUTYPE, FPU_68040);
BOOTINFO1(param_ptr, BI_MMUTYPE, MMU_68040);
BOOTINFO1(param_ptr, BI_CPUTYPE, CPU_68040);
BOOTINFO2(param_ptr, BI_MEMCHUNK, 0, ram_size);
BOOTINFO1(param_ptr, BI_VIRT_QEMU_VERSION,
((QEMU_VERSION_MAJOR << 24) | (QEMU_VERSION_MINOR << 16) |
(QEMU_VERSION_MICRO << 8)));
BOOTINFO2(param_ptr, BI_VIRT_GF_PIC_BASE,
VIRT_GF_PIC_MMIO_BASE, VIRT_GF_PIC_IRQ_BASE);
BOOTINFO2(param_ptr, BI_VIRT_GF_RTC_BASE,
VIRT_GF_RTC_MMIO_BASE, VIRT_GF_RTC_IRQ_BASE);
BOOTINFO2(param_ptr, BI_VIRT_GF_TTY_BASE,
VIRT_GF_TTY_MMIO_BASE, VIRT_GF_TTY_IRQ_BASE);
BOOTINFO2(param_ptr, BI_VIRT_CTRL_BASE,
VIRT_CTRL_MMIO_BASE, VIRT_CTRL_IRQ_BASE);
BOOTINFO2(param_ptr, BI_VIRT_VIRTIO_BASE,
VIRT_VIRTIO_MMIO_BASE, VIRT_VIRTIO_IRQ_BASE);
if (kernel_cmdline) {
BOOTINFOSTR(param_ptr, BI_COMMAND_LINE,
kernel_cmdline);
}
/* Pass seed to RNG. */
param_rng_seed = param_ptr;
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
BOOTINFODATA(param_ptr, BI_RNG_SEED,
rng_seed, sizeof(rng_seed));
/* load initrd */
if (initrd_filename) {
initrd_size = get_image_size(initrd_filename);
if (initrd_size < 0) {
error_report("could not load initial ram disk '%s'",
initrd_filename);
exit(1);
}
initrd_base = (ram_size - initrd_size) & TARGET_PAGE_MASK;
load_image_targphys(initrd_filename, initrd_base,
ram_size - initrd_base);
BOOTINFO2(param_ptr, BI_RAMDISK, initrd_base,
initrd_size);
} else {
initrd_base = 0;
initrd_size = 0;
}
BOOTINFO0(param_ptr, BI_LAST);
rom_add_blob_fixed_as("bootinfo", param_blob, param_ptr - param_blob,
parameters_base, cs->as);
qemu_register_reset_nosnapshotload(rerandomize_rng_seed,
rom_ptr_for_as(cs->as, parameters_base,
param_ptr - param_blob) +
(param_rng_seed - param_blob));
g_free(param_blob);
}
}
static void virt_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
mc->desc = "QEMU M68K Virtual Machine";
mc->init = virt_init;
mc->default_cpu_type = M68K_CPU_TYPE_NAME("m68040");
mc->max_cpus = 1;
mc->no_floppy = 1;
mc->no_parallel = 1;
mc->default_ram_id = "m68k_virt.ram";
}
static const TypeInfo virt_machine_info = {
.name = MACHINE_TYPE_NAME("virt"),
.parent = TYPE_MACHINE,
.abstract = true,
.class_init = virt_machine_class_init,
};
static void virt_machine_register_types(void)
{
type_register_static(&virt_machine_info);
}
type_init(virt_machine_register_types)
#define DEFINE_VIRT_MACHINE(major, minor, latest) \
static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
void *data) \
{ \
MachineClass *mc = MACHINE_CLASS(oc); \
virt_machine_##major##_##minor##_options(mc); \
mc->desc = "QEMU " # major "." # minor " M68K Virtual Machine"; \
if (latest) { \
mc->alias = "virt"; \
} \
} \
static const TypeInfo machvirt_##major##_##minor##_info = { \
.name = MACHINE_TYPE_NAME("virt-" # major "." # minor), \
.parent = MACHINE_TYPE_NAME("virt"), \
.class_init = virt_##major##_##minor##_class_init, \
}; \
static void machvirt_machine_##major##_##minor##_init(void) \
{ \
type_register_static(&machvirt_##major##_##minor##_info); \
} \
type_init(machvirt_machine_##major##_##minor##_init);
static void virt_machine_7_2_options(MachineClass *mc)
{
}
DEFINE_VIRT_MACHINE(7, 2, true)
static void virt_machine_7_1_options(MachineClass *mc)
{
virt_machine_7_2_options(mc);
compat_props_add(mc->compat_props, hw_compat_7_1, hw_compat_7_1_len);
}
DEFINE_VIRT_MACHINE(7, 1, false)
static void virt_machine_7_0_options(MachineClass *mc)
{
virt_machine_7_1_options(mc);
compat_props_add(mc->compat_props, hw_compat_7_0, hw_compat_7_0_len);
}
DEFINE_VIRT_MACHINE(7, 0, false)
static void virt_machine_6_2_options(MachineClass *mc)
{
virt_machine_7_0_options(mc);
compat_props_add(mc->compat_props, hw_compat_6_2, hw_compat_6_2_len);
}
DEFINE_VIRT_MACHINE(6, 2, false)
static void virt_machine_6_1_options(MachineClass *mc)
{
virt_machine_6_2_options(mc);
compat_props_add(mc->compat_props, hw_compat_6_1, hw_compat_6_1_len);
}
DEFINE_VIRT_MACHINE(6, 1, false)
static void virt_machine_6_0_options(MachineClass *mc)
{
virt_machine_6_1_options(mc);
compat_props_add(mc->compat_props, hw_compat_6_0, hw_compat_6_0_len);
}
DEFINE_VIRT_MACHINE(6, 0, false)
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