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Annotation of qemu/hw/vmport.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU VMPort emulation
        !             3:  *
        !             4:  * Copyright (C) 2007 Herv� Poussineau
        !             5:  *
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to deal
        !             8:  * in the Software without restriction, including without limitation the rights
        !             9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            10:  * copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            22:  * THE SOFTWARE.
        !            23:  */
        !            24: #include "hw.h"
        !            25: #include "isa.h"
        !            26: #include "pc.h"
        !            27: #include "sysemu.h"
        !            28: 
        !            29: #define VMPORT_CMD_GETVERSION 0x0a
        !            30: #define VMPORT_CMD_GETRAMSIZE 0x14
        !            31: 
        !            32: #define VMPORT_ENTRIES 0x2c
        !            33: #define VMPORT_MAGIC   0x564D5868
        !            34: 
        !            35: typedef struct _VMPortState
        !            36: {
        !            37:     CPUState *env;
        !            38:     IOPortReadFunc *func[VMPORT_ENTRIES];
        !            39:     void *opaque[VMPORT_ENTRIES];
        !            40: } VMPortState;
        !            41: 
        !            42: static VMPortState port_state;
        !            43: 
        !            44: void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
        !            45: {
        !            46:     if (command >= VMPORT_ENTRIES)
        !            47:         return;
        !            48: 
        !            49:     port_state.func[command] = func;
        !            50:     port_state.opaque[command] = opaque;
        !            51: }
        !            52: 
        !            53: static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
        !            54: {
        !            55:     VMPortState *s = opaque;
        !            56:     unsigned char command;
        !            57:     uint32_t eax;
        !            58: 
        !            59:     eax = s->env->regs[R_EAX];
        !            60:     if (eax != VMPORT_MAGIC)
        !            61:         return eax;
        !            62: 
        !            63:     command = s->env->regs[R_ECX];
        !            64:     if (command >= VMPORT_ENTRIES)
        !            65:         return eax;
        !            66:     if (!s->func[command])
        !            67:     {
        !            68:         printf("vmport: unknown command %x\n", command);
        !            69:         return eax;
        !            70:     }
        !            71: 
        !            72:     return s->func[command](s->opaque[command], addr);
        !            73: }
        !            74: 
        !            75: static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
        !            76: {
        !            77:     CPUState *env = opaque;
        !            78:     env->regs[R_EBX] = VMPORT_MAGIC;
        !            79:     return 6;
        !            80: }
        !            81: 
        !            82: static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
        !            83: {
        !            84:     CPUState *env = opaque;
        !            85:     env->regs[R_EBX] = 0x1177;
        !            86:     return ram_size;
        !            87: }
        !            88: 
        !            89: void vmport_init(CPUState *env)
        !            90: {
        !            91:     port_state.env = env;
        !            92: 
        !            93:     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
        !            94: 
        !            95:     /* Register some generic port commands */
        !            96:     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, env);
        !            97:     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, env);
        !            98: }

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