Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386at/iopl.c
Version:
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 /* 27 * HISTORY 28 * $Log: iopl.c,v $ 29 * Revision 2.11 93/09/01 11:32:49 mrt 30 * For X11R5, allow any old address to be mmapped. 31 * [93/08/19 rvb] 32 * 33 * Revision 2.10 93/03/09 11:18:43 danner 34 * And printer at 0x278 35 * [93/03/04 11:16:17 rvb] 36 * 37 * Added two ports for ATI graphics card from Savage. 38 * [93/03/03 rvb] 39 * 40 * Revision 2.9 92/04/03 12:09:07 rpd 41 * Change mapping of mmap function to map 0x0, 0xa0000..0xfffff 42 * directly. 43 * [92/03/16 rvb] 44 * 45 * Revision 2.8 92/01/03 20:11:01 dbg 46 * Add 'forbidden' list. For DOS compatibility, allow any port not 47 * on this list. 48 * [92/01/02 dbg] 49 * 50 * Add ports 70 and 71 for DOS programs (XXX). 51 * [91/12/18 dbg] 52 * 53 * Use io_port sets. 54 * [91/11/09 dbg] 55 * 56 * Revision 2.7 91/05/14 16:26:21 mrt 57 * Correcting copyright 58 * 59 * Revision 2.6 91/02/05 17:18:43 mrt 60 * Changed to new Mach copyright 61 * [91/02/01 17:44:59 mrt] 62 * 63 * Revision 2.5 90/11/26 14:50:15 rvb 64 * jsb bet me to XMK34, sigh ... 65 * [90/11/26 rvb] 66 * Synched 2.5 & 3.0 at I386q (r2.1.1.3) & XMK35 (r2.5) 67 * [90/11/15 rvb] 68 * 69 * Revision 2.1.1.2 90/03/28 08:30:58 rvb 70 * Add ioplmmap to map 0x0a0000 - 0x100000 71 * [90/03/25 rvb] 72 * 73 * Revision 2.1.1.1 90/02/01 13:36:55 rvb 74 * Allow io privileges to the process. 75 * [90/02/01 rvb] 76 * 77 */ 78 79 #include <mach/vm_prot.h> 80 #include <mach/i386/vm_types.h> 81 #include <mach/i386/vm_param.h> 82 83 #include <ipc/ipc_port.h> 84 85 #include <device/io_req.h> 86 87 #include <i386/io_port.h> 88 #include <i386/eflags.h> 89 #include <i386/pit.h> 90 91 /* 92 * IOPL device. 93 */ 94 ipc_port_t iopl_device_port = IP_NULL; 95 device_t iopl_device = 0; 96 97 /* 98 * Ports that we allow access to. 99 */ 100 io_reg_t iopl_port_list[] = { 101 /* timer 2 */ 102 0x42, 103 /* speaker output */ 104 0x61, 105 /* configuration RAM */ 106 0x70, 0x71, /* XXX should not need! */ 107 /* ATI - savage */ 108 0x1ce, 0x1cf, 109 /* game port */ 110 0x201, 111 /* sound board */ 112 0x220, 0x221, 0x222, 0x223, 0x224, 0x225, 0x226, 0x227, 113 0x228, 0x229, 0x22a, 0x22b, 0x22c, 0x22d, 0x22e, 0x22f, 114 /* printer */ 115 0x278, 0x279, 0x27a, 116 0x378, 0x379, 0x37a, 117 /* ega/vga */ 118 0x3b0, 0x3b1, 0x3b2, 0x3b3, 0x3b4, 0x3b5, 0x3b6, 0x3b7, 119 0x3b8, 0x3b9, 0x3ba, 0x3bb, 0x3bc, 0x3bd, 0x3be, 0x3bf, 120 0x3c0, 0x3c1, 0x3c2, 0x3c3, 0x3c4, 0x3c5, 0x3c6, 0x3c7, 121 0x3c8, 0x3c9, 0x3ca, 0x3cb, 0x3cc, 0x3cd, 0x3ce, 0x3cf, 122 0x3d0, 0x3d1, 0x3d2, 0x3d3, 0x3d4, 0x3d5, 0x3d6, 0x3d7, 123 0x3d8, 0x3d9, 0x3da, 0x3db, 0x3dc, 0x3dd, 0x3de, 0x3df, 124 /* end of list */ 125 IO_REG_NULL 126 }; 127 128 int 129 ioplopen(dev, flag, ior) 130 int dev; 131 int flag; 132 io_req_t ior; 133 { 134 iopl_device_port = ior->io_device->port; 135 iopl_device = ior->io_device; 136 137 io_port_create(iopl_device, iopl_port_list); 138 return (0); 139 } 140 141 142 /*ARGSUSED*/ 143 ioplclose(dev, flags) 144 int dev; 145 int flags; 146 { 147 io_port_destroy(iopl_device); 148 iopl_device_port = IP_NULL; 149 iopl_device = 0; 150 return 0; 151 } 152 153 /*ARGSUSED*/ 154 int iopl_all = 1; 155 ioplmmap(dev, off, prot) 156 int dev; 157 vm_offset_t off; 158 vm_prot_t prot; 159 { 160 extern vm_offset_t last_addr; 161 162 if (iopl_all) { 163 if (off == 0) 164 return 0; 165 else if (off < 0xa0000) 166 return -1; 167 else if (off >= 0x100000 && off <= last_addr) 168 return -1; 169 else 170 return i386_btop(off); 171 172 } 173 if (off > 0x60000) 174 return(-1); 175 176 /* Get page frame number for the page to be mapped. */ 177 178 return(i386_btop(0xa0000 + off)); 179 } 180 181 /* 182 * For DOS compatibility, it's easier to list the ports we don't 183 * allow access to. 184 */ 185 #define IOPL_PORTS_USED_MAX 256 186 io_reg_t iopl_ports_used[IOPL_PORTS_USED_MAX] = { 187 IO_REG_NULL 188 }; 189 190 boolean_t 191 iopl_port_forbidden(io_port) 192 int io_port; 193 { 194 int i; 195 196 #if 0 /* we only read from these... it should be OK */ 197 198 if (io_port <= 0xff) 199 return TRUE; /* system ports. 42,61,70,71 allowed above */ 200 201 if (io_port >= 0x130 && io_port <= 0x137) 202 return TRUE; /* AHA disk */ 203 204 if (io_port >= 0x170 && io_port <= 0x177) 205 return TRUE; /* HD disk */ 206 207 if (io_port >= 0x1f0 && io_port <= 0x1f7) 208 return TRUE; /* HD disk */ 209 210 if (io_port >= 0x230 && io_port <= 0x237) 211 return TRUE; /* AHA disk */ 212 213 if (io_port >= 0x280 && io_port <= 0x2df) 214 return TRUE; /* 8390 network */ 215 216 if (io_port >= 0x300 && io_port <= 0x31f) 217 return TRUE; /* 8390 network */ 218 219 if (io_port >= 0x330 && io_port <= 0x337) 220 return TRUE; /* AHA disk */ 221 222 if (io_port >= 0x370 && io_port <= 0x377) 223 return TRUE; /* FD disk */ 224 225 if (io_port >= 0x3f0 && io_port <= 0x3f7) 226 return TRUE; /* FD disk */ 227 228 #endif 229 230 /* 231 * Must be OK, as far as we know... 232 * Record the port in the list, for 233 * curiosity seekers. 234 */ 235 for (i = 0; i < IOPL_PORTS_USED_MAX; i++) { 236 if (iopl_ports_used[i] == io_port) 237 break; /* in list */ 238 if (iopl_ports_used[i] == IO_REG_NULL) { 239 iopl_ports_used[i] = io_port; 240 iopl_ports_used[i+1] = IO_REG_NULL; 241 break; 242 } 243 } 244 245 return FALSE; 246 } 247 248 /* 249 * Emulate certain IO instructions for the AT bus. 250 * 251 * We emulate writes to the timer control port, 43. 252 * Only writes to timer 2 are allowed. 253 * 254 * Temporarily, we allow reads of any IO port, 255 * but ONLY if the thread has the IOPL device mapped 256 * and is not in V86 mode. 257 * 258 * This is a HACK and MUST go away when the DOS emulator 259 * emulates these IO ports, or when we decide that 260 * the DOS world can get access to all uncommitted IO 261 * ports. In that case, config() should remove the IO 262 * ports for devices it exists from the allowable list. 263 */ 264 boolean_t 265 iopl_emulate(regs, opcode, io_port) 266 struct i386_saved_state *regs; 267 int opcode; 268 int io_port; 269 { 270 iopb_tss_t iopb; 271 272 iopb = current_thread()->pcb->ims.io_tss; 273 if (iopb == 0) 274 return FALSE; /* no IO mapped */ 275 276 /* 277 * Handle outb to the timer control port, 278 * for timer 2 only. 279 */ 280 if (io_port == PITCTL_PORT) { 281 282 int io_byte = regs->eax & 0xff; 283 284 if (((iopb->bitmap[PITCTR2_PORT >> 3] & (1 << (PITCTR2_PORT & 0x7))) 285 == 0) /* allowed */ 286 && (opcode == 0xe6 || opcode == 0xee) /* outb */ 287 && (io_byte & 0xc0) == 0x80) /* timer 2 */ 288 { 289 outb(io_port, io_byte); 290 return TRUE; 291 } 292 return FALSE; /* invalid IO to port 42 */ 293 } 294 295 /* 296 * If the thread has the IOPL device mapped, and 297 * the io port is not on the 'forbidden' list, allow 298 * reads from it. Reject writes. 299 * 300 * Don`t do this for V86 mode threads 301 * (hack for DOS emulator XXX!) 302 */ 303 if (!(regs->efl & EFL_VM) && 304 iopb_check_mapping(current_thread(), iopl_device) && 305 !iopl_port_forbidden(io_port)) 306 { 307 /* 308 * handle inb, inw, inl 309 */ 310 switch (opcode) { 311 case 0xE4: /* inb imm */ 312 case 0xEC: /* inb dx */ 313 regs->eax = (regs->eax & 0xffffff00) 314 | inb(io_port); 315 return TRUE; 316 317 case 0x66E5: /* inw imm */ 318 case 0x66ED: /* inw dx */ 319 regs->eax = (regs->eax & 0xffff0000) 320 | inw(io_port); 321 return TRUE; 322 323 case 0xE5: /* inl imm */ 324 case 0xED: /* inl dx */ 325 regs->eax = inl(io_port); 326 return TRUE; 327 328 default: 329 return FALSE; /* OUT not allowed */ 330 } 331 } 332 333 /* 334 * Not OK. 335 */ 336 return FALSE; 337 } 338
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