In an ideal world, machines can be built by wiring devices together
with configuration, not code. Unfortunately, that's not the world we
live in right now. We still have quite a few devices that need to be
wired up by code. If you try to device_add such a device, it'll fail
in sometimes mysterious ways. If you're lucky, you get an
unmysterious immediate crash.
To protect users from such badness, DeviceClass member no_user used to
make device models unavailable with -device / device_add, but that
regressed in commit 18b6dad
. The device model is still omitted from
help, but is available anyway.
Attempts to fix the regression have been rejected with the argument
that the purpose of no_user isn't clear, and it's prone to misuse.
This commit clarifies no_user's purpose. Anthony suggested to rename
it cannot_instantiate_with_device_add_yet_due_to_internal_bugs, which
I shorten somewhat to keep checkpatch happy. While there, make it
bool.
Every use of cannot_instantiate_with_device_add_yet gets a FIXME
comment asking for rationale. The next few commits will clean them
all up, either by providing a rationale, or by getting rid of the use.
With that done, the regression fix is hopefully acceptable.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
181 lines
5 KiB
C
181 lines
5 KiB
C
/*
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* QEMU VMPort emulation
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*
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* Copyright (C) 2007 Hervé Poussineau
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/hw.h"
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#include "hw/isa/isa.h"
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#include "hw/i386/pc.h"
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#include "sysemu/kvm.h"
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#include "hw/qdev.h"
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//#define VMPORT_DEBUG
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#define VMPORT_CMD_GETVERSION 0x0a
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#define VMPORT_CMD_GETRAMSIZE 0x14
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#define VMPORT_ENTRIES 0x2c
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#define VMPORT_MAGIC 0x564D5868
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#define TYPE_VMPORT "vmport"
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#define VMPORT(obj) OBJECT_CHECK(VMPortState, (obj), TYPE_VMPORT)
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typedef struct VMPortState
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{
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ISADevice parent_obj;
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MemoryRegion io;
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VMPortReadFunc *func[VMPORT_ENTRIES];
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void *opaque[VMPORT_ENTRIES];
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} VMPortState;
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static VMPortState *port_state;
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void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
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{
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if (command >= VMPORT_ENTRIES)
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return;
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port_state->func[command] = func;
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port_state->opaque[command] = opaque;
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}
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static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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VMPortState *s = opaque;
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CPUState *cs = current_cpu;
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X86CPU *cpu = X86_CPU(cs);
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CPUX86State *env = &cpu->env;
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unsigned char command;
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uint32_t eax;
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cpu_synchronize_state(cs);
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eax = env->regs[R_EAX];
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if (eax != VMPORT_MAGIC)
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return eax;
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command = env->regs[R_ECX];
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if (command >= VMPORT_ENTRIES)
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return eax;
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if (!s->func[command])
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{
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#ifdef VMPORT_DEBUG
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fprintf(stderr, "vmport: unknown command %x\n", command);
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#endif
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return eax;
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}
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return s->func[command](s->opaque[command], addr);
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}
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static void vmport_ioport_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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X86CPU *cpu = X86_CPU(current_cpu);
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cpu->env.regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
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}
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static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
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{
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X86CPU *cpu = X86_CPU(current_cpu);
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cpu->env.regs[R_EBX] = VMPORT_MAGIC;
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return 6;
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}
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static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
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{
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X86CPU *cpu = X86_CPU(current_cpu);
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cpu->env.regs[R_EBX] = 0x1177;
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return ram_size;
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}
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/* vmmouse helpers */
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void vmmouse_get_data(uint32_t *data)
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{
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X86CPU *cpu = X86_CPU(current_cpu);
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CPUX86State *env = &cpu->env;
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data[0] = env->regs[R_EAX]; data[1] = env->regs[R_EBX];
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data[2] = env->regs[R_ECX]; data[3] = env->regs[R_EDX];
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data[4] = env->regs[R_ESI]; data[5] = env->regs[R_EDI];
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}
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void vmmouse_set_data(const uint32_t *data)
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{
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X86CPU *cpu = X86_CPU(current_cpu);
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CPUX86State *env = &cpu->env;
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env->regs[R_EAX] = data[0]; env->regs[R_EBX] = data[1];
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env->regs[R_ECX] = data[2]; env->regs[R_EDX] = data[3];
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env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
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}
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static const MemoryRegionOps vmport_ops = {
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.read = vmport_ioport_read,
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.write = vmport_ioport_write,
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.impl = {
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.min_access_size = 4,
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.max_access_size = 4,
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},
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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static void vmport_realizefn(DeviceState *dev, Error **errp)
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{
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ISADevice *isadev = ISA_DEVICE(dev);
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VMPortState *s = VMPORT(dev);
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memory_region_init_io(&s->io, OBJECT(s), &vmport_ops, s, "vmport", 1);
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isa_register_ioport(isadev, &s->io, 0x5658);
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port_state = s;
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/* Register some generic port commands */
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vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
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vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
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}
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static void vmport_class_initfn(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = vmport_realizefn;
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dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
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}
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static const TypeInfo vmport_info = {
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.name = TYPE_VMPORT,
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.parent = TYPE_ISA_DEVICE,
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.instance_size = sizeof(VMPortState),
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.class_init = vmport_class_initfn,
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};
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static void vmport_register_types(void)
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{
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type_register_static(&vmport_info);
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}
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type_init(vmport_register_types)
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