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generic-loader: Add a generic loader 

Add a generic loader to QEMU which can be used to load images or set
memory values.

Internally inside QEMU this is a device. It is a strange device that
provides no hardware interface but allows QEMU to monkey patch memory
specified when it is created. To be able to do this it has a reset
callback that does the memory operations.

This device allows the user to monkey patch memory. To be able to do
this it needs a backend to manage the datas, the same as other
memory-related devices. In this case as the backend is so trivial we
have merged it with the frontend instead of creating and maintaining a
seperate backend.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-id: 10f2a9dce5e5e11b6c6d959415b0ad6ee22bcba5.1475195078.git.alistair.francis@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alistair Francis 2016-10-04 13:28:09 +01:00 committed by Peter Maydell
parent 13e5c54d30
commit e481a1f63c
4 changed files with 265 additions and 0 deletions
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6
MAINTAINERS
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@ -1029,6 +1029,12 @@ M: Dmitry Fleytman <dmitry@daynix.com>
S: Maintained
F: hw/net/e1000e*
Generic Loader
M: Alistair Francis <alistair.francis@xilinx.com>
S: Maintained
F: hw/core/generic-loader.c
F: include/hw/core/generic-loader.h
Subsystems
----------
Audio

2
hw/core/Makefile.objs
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@ -18,3 +18,5 @@ common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
common-obj-$(CONFIG_SOFTMMU) += register.o
common-obj-$(CONFIG_SOFTMMU) += or-irq.o
common-obj-$(CONFIG_PLATFORM_BUS) += platform-bus.o
obj-$(CONFIG_SOFTMMU) += generic-loader.o

211
hw/core/generic-loader.c Normal file
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@ -0,0 +1,211 @@
/*
* Generic Loader
*
* Copyright (C) 2014 Li Guang
* Copyright (C) 2016 Xilinx Inc.
* Written by Li Guang <lig.fnst@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* for more details.
*
*/
/*
* Internally inside QEMU this is a device. It is a strange device that
* provides no hardware interface but allows QEMU to monkey patch memory
* specified when it is created. To be able to do this it has a reset
* callback that does the memory operations.
* This device allows the user to monkey patch memory. To be able to do
* this it needs a backend to manage the datas, the same as other
* memory-related devices. In this case as the backend is so trivial we
* have merged it with the frontend instead of creating and maintaining a
* seperate backend.
*/
#include "qemu/osdep.h"
#include "qom/cpu.h"
#include "hw/sysbus.h"
#include "sysemu/dma.h"
#include "hw/loader.h"
#include "qapi/error.h"
#include "hw/core/generic-loader.h"
#define CPU_NONE 0xFFFFFFFF
static void generic_loader_reset(void *opaque)
{
GenericLoaderState *s = GENERIC_LOADER(opaque);
if (s->set_pc) {
CPUClass *cc = CPU_GET_CLASS(s->cpu);
cpu_reset(s->cpu);
if (cc) {
cc->set_pc(s->cpu, s->addr);
}
}
if (s->data_len) {
assert(s->data_len < sizeof(s->data));
dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len);
}
}
static void generic_loader_realize(DeviceState *dev, Error **errp)
{
GenericLoaderState *s = GENERIC_LOADER(dev);
hwaddr entry;
int big_endian;
int size = 0;
s->set_pc = false;
/* Perform some error checking on the user's options */
if (s->data || s->data_len || s->data_be) {
/* User is loading memory values */
if (s->file) {
error_setg(errp, "Specifying a file is not supported when loading "
"memory values");
return;
} else if (s->force_raw) {
error_setg(errp, "Specifying force-raw is not supported when "
"loading memory values");
return;
} else if (!s->data_len) {
/* We cant' check for !data here as a value of 0 is still valid. */
error_setg(errp, "Both data and data-len must be specified");
return;
} else if (s->data_len > 8) {
error_setg(errp, "data-len cannot be greater then 8 bytes");
return;
}
} else if (s->file || s->force_raw) {
/* User is loading an image */
if (s->data || s->data_len || s->data_be) {
error_setg(errp, "data can not be specified when loading an "
"image");
return;
}
s->set_pc = true;
} else if (s->addr) {
/* User is setting the PC */
if (s->data || s->data_len || s->data_be) {
error_setg(errp, "data can not be specified when setting a "
"program counter");
return;
} else if (!s->cpu_num) {
error_setg(errp, "cpu_num must be specified when setting a "
"program counter");
return;
}
s->set_pc = true;
} else {
/* Did the user specify anything? */
error_setg(errp, "please include valid arguments");
return;
}
qemu_register_reset(generic_loader_reset, dev);
if (s->cpu_num != CPU_NONE) {
s->cpu = qemu_get_cpu(s->cpu_num);
if (!s->cpu) {
error_setg(errp, "Specified boot CPU#%d is nonexistent",
s->cpu_num);
return;
}
} else {
s->cpu = first_cpu;
}
#ifdef TARGET_WORDS_BIGENDIAN
big_endian = 1;
#else
big_endian = 0;
#endif
if (s->file) {
if (!s->force_raw) {
size = load_elf_as(s->file, NULL, NULL, &entry, NULL, NULL,
big_endian, 0, 0, 0, s->cpu->as);
if (size < 0) {
size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
s->cpu->as);
}
}
if (size < 0 || s->force_raw) {
/* Default to the maximum size being the machine's ram size */
size = load_image_targphys_as(s->file, s->addr, ram_size,
s->cpu->as);
} else {
s->addr = entry;
}
if (size < 0) {
error_setg(errp, "Cannot load specified image %s", s->file);
return;
}
}
/* Convert the data endiannes */
if (s->data_be) {
s->data = cpu_to_be64(s->data);
} else {
s->data = cpu_to_le64(s->data);
}
}
static void generic_loader_unrealize(DeviceState *dev, Error **errp)
{
qemu_unregister_reset(generic_loader_reset, dev);
}
static Property generic_loader_props[] = {
DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
DEFINE_PROP_STRING("file", GenericLoaderState, file),
DEFINE_PROP_END_OF_LIST(),
};
static void generic_loader_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
/* The reset function is not registered here and is instead registered in
* the realize function to allow this device to be added via the device_add
* command in the QEMU monitor.
* TODO: Improve the device_add functionality to allow resets to be
* connected
*/
dc->realize = generic_loader_realize;
dc->unrealize = generic_loader_unrealize;
dc->props = generic_loader_props;
dc->desc = "Generic Loader";
}
static TypeInfo generic_loader_info = {
.name = TYPE_GENERIC_LOADER,
.parent = TYPE_DEVICE,
.instance_size = sizeof(GenericLoaderState),
.class_init = generic_loader_class_init,
};
static void generic_loader_register_type(void)
{
type_register_static(&generic_loader_info);
}
type_init(generic_loader_register_type)

46
include/hw/core/generic-loader.h Normal file
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@ -0,0 +1,46 @@
/*
* Generic Loader
*
* Copyright (C) 2014 Li Guang
* Written by Li Guang <lig.fnst@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* for more details.
*/
#ifndef GENERIC_LOADER_H
#define GENERIC_LOADER_H
#include "elf.h"
typedef struct GenericLoaderState {
/* <private> */
DeviceState parent_obj;
/* <public> */
CPUState *cpu;
uint64_t addr;
uint64_t data;
uint8_t data_len;
uint32_t cpu_num;
char *file;
bool force_raw;
bool data_be;
bool set_pc;
} GenericLoaderState;
#define TYPE_GENERIC_LOADER "loader"
#define GENERIC_LOADER(obj) OBJECT_CHECK(GenericLoaderState, (obj), \
TYPE_GENERIC_LOADER)
#endif