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https://github.com/xemu-project/xemu.git
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6dab28d5b5
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3374 c046a42c-6fe2-441c-8c8c-71466251a162
97 lines
2.8 KiB
C
97 lines
2.8 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 "vl.h"
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#include "cpu-all.h"
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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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typedef struct _VMPortState
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{
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CPUState *env;
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IOPortReadFunc *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, IOPortReadFunc *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 uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
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{
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VMPortState *s = opaque;
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unsigned char command;
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uint32_t eax;
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eax = s->env->regs[R_EAX];
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if (eax != VMPORT_MAGIC)
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return eax;
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command = s->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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printf("vmport: unknown command %x\n", command);
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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 uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
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{
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CPUState *env = opaque;
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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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CPUState *env = opaque;
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env->regs[R_EBX] = 0x1177;
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return ram_size;
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}
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void vmport_init(CPUState *env)
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{
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port_state.env = env;
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register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
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/* Register some generic port commands */
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vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, env);
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vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, env);
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}
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