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Annotation of qemu/hw/vmport.c, revision 1.1.1.2

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: 
1.1.1.2 ! root       29: //#define VMPORT_DEBUG
        !            30: 
1.1       root       31: #define VMPORT_CMD_GETVERSION 0x0a
                     32: #define VMPORT_CMD_GETRAMSIZE 0x14
                     33: 
                     34: #define VMPORT_ENTRIES 0x2c
                     35: #define VMPORT_MAGIC   0x564D5868
                     36: 
                     37: typedef struct _VMPortState
                     38: {
                     39:     IOPortReadFunc *func[VMPORT_ENTRIES];
                     40:     void *opaque[VMPORT_ENTRIES];
                     41: } VMPortState;
                     42: 
                     43: static VMPortState port_state;
                     44: 
                     45: void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
                     46: {
                     47:     if (command >= VMPORT_ENTRIES)
                     48:         return;
                     49: 
                     50:     port_state.func[command] = func;
                     51:     port_state.opaque[command] = opaque;
                     52: }
                     53: 
                     54: static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
                     55: {
                     56:     VMPortState *s = opaque;
1.1.1.2 ! root       57:     CPUState *env = cpu_single_env;
1.1       root       58:     unsigned char command;
                     59:     uint32_t eax;
                     60: 
1.1.1.2 ! root       61:     eax = env->regs[R_EAX];
1.1       root       62:     if (eax != VMPORT_MAGIC)
                     63:         return eax;
                     64: 
1.1.1.2 ! root       65:     command = env->regs[R_ECX];
1.1       root       66:     if (command >= VMPORT_ENTRIES)
                     67:         return eax;
                     68:     if (!s->func[command])
                     69:     {
1.1.1.2 ! root       70: #ifdef VMPORT_DEBUG
        !            71:         fprintf(stderr, "vmport: unknown command %x\n", command);
        !            72: #endif
1.1       root       73:         return eax;
                     74:     }
                     75: 
                     76:     return s->func[command](s->opaque[command], addr);
                     77: }
                     78: 
1.1.1.2 ! root       79: static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
        !            80: {
        !            81:     CPUState *env = cpu_single_env;
        !            82: 
        !            83:     env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
        !            84: }
        !            85: 
1.1       root       86: static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
                     87: {
1.1.1.2 ! root       88:     CPUState *env = cpu_single_env;
1.1       root       89:     env->regs[R_EBX] = VMPORT_MAGIC;
                     90:     return 6;
                     91: }
                     92: 
                     93: static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
                     94: {
1.1.1.2 ! root       95:     CPUState *env = cpu_single_env;
1.1       root       96:     env->regs[R_EBX] = 0x1177;
                     97:     return ram_size;
                     98: }
                     99: 
1.1.1.2 ! root      100: void vmport_init(void)
1.1       root      101: {
                    102:     register_ioport_read(0x5658, 1, 4, vmport_ioport_read, &port_state);
1.1.1.2 ! root      103:     register_ioport_write(0x5658, 1, 4, vmport_ioport_write, &port_state);
1.1       root      104: 
                    105:     /* Register some generic port commands */
1.1.1.2 ! root      106:     vmport_register(VMPORT_CMD_GETVERSION, vmport_cmd_get_version, NULL);
        !           107:     vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
1.1       root      108: }

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