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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <mach/vm_prot.h>
#include <mach/machine/vm_types.h>
#include <mach/machine/vm_param.h>
#include <mach/machine/eflags.h>
#include <ipc/ipc_port.h>
#include <device/io_req.h>
#include <i386/io_port.h>
#include <i386/pit.h>
/*
* IOPL device.
*/
ipc_port_t iopl_device_port = IP_NULL;
mach_device_t iopl_device = 0;
/*
* Ports that we allow access to.
*/
io_reg_t iopl_port_list[] = {
/* timer 2 */
0x42,
/* speaker output */
0x61,
/* ATI - savage */
0x1ce, 0x1cf,
/* game port */
0x201,
/* sound board */
0x220, 0x221, 0x222, 0x223, 0x224, 0x225, 0x226, 0x227,
0x228, 0x229, 0x22a, 0x22b, 0x22c, 0x22d, 0x22e, 0x22f,
/* printer */
0x278, 0x279, 0x27a,
0x378, 0x379, 0x37a,
/* ega/vga */
0x3b0, 0x3b1, 0x3b2, 0x3b3, 0x3b4, 0x3b5, 0x3b6, 0x3b7,
0x3b8, 0x3b9, 0x3ba, 0x3bb, 0x3bc, 0x3bd, 0x3be, 0x3bf,
0x3c0, 0x3c1, 0x3c2, 0x3c3, 0x3c4, 0x3c5, 0x3c6, 0x3c7,
0x3c8, 0x3c9, 0x3ca, 0x3cb, 0x3cc, 0x3cd, 0x3ce, 0x3cf,
0x3d0, 0x3d1, 0x3d2, 0x3d3, 0x3d4, 0x3d5, 0x3d6, 0x3d7,
0x3d8, 0x3d9, 0x3da, 0x3db, 0x3dc, 0x3dd, 0x3de, 0x3df,
/* end of list */
IO_REG_NULL,
/* patch space */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
int
ioplopen(dev, flag, ior)
int dev;
int flag;
io_req_t ior;
{
iopl_device_port = ior->io_device->port;
iopl_device = ior->io_device;
io_port_create(iopl_device, iopl_port_list);
return (0);
}
/*ARGSUSED*/
ioplclose(dev, flags)
int dev;
int flags;
{
io_port_destroy(iopl_device);
iopl_device_port = IP_NULL;
iopl_device = 0;
return 0;
}
/*ARGSUSED*/
int iopl_all = 1;
ioplmmap(dev, off, prot)
int dev;
vm_offset_t off;
vm_prot_t prot;
{
extern vm_offset_t phys_last_addr;
if (iopl_all) {
if (off == 0)
return 0;
else if (off < 0xa0000)
return -1;
else if (off >= 0x100000 && off <= phys_last_addr)
return -1;
else
return i386_btop(off);
}
if (off > 0x60000)
return(-1);
/* Get page frame number for the page to be mapped. */
return(i386_btop(0xa0000 + off));
}
/*
* For DOS compatibility, it's easier to list the ports we don't
* allow access to.
*/
#define IOPL_PORTS_USED_MAX 256
io_reg_t iopl_ports_used[IOPL_PORTS_USED_MAX] = {
IO_REG_NULL
};
boolean_t
iopl_port_forbidden(io_port)
int io_port;
{
int i;
#if 0 /* we only read from these... it should be OK */
if (io_port <= 0xff)
return TRUE; /* system ports. 42,61,70,71 allowed above */
if (io_port >= 0x130 && io_port <= 0x137)
return TRUE; /* AHA disk */
if (io_port >= 0x170 && io_port <= 0x177)
return TRUE; /* HD disk */
if (io_port >= 0x1f0 && io_port <= 0x1f7)
return TRUE; /* HD disk */
if (io_port >= 0x230 && io_port <= 0x237)
return TRUE; /* AHA disk */
if (io_port >= 0x280 && io_port <= 0x2df)
return TRUE; /* 8390 network */
if (io_port >= 0x300 && io_port <= 0x31f)
return TRUE; /* 8390 network */
if (io_port >= 0x330 && io_port <= 0x337)
return TRUE; /* AHA disk */
if (io_port >= 0x370 && io_port <= 0x377)
return TRUE; /* FD disk */
if (io_port >= 0x3f0 && io_port <= 0x3f7)
return TRUE; /* FD disk */
#endif
/*
* Must be OK, as far as we know...
* Record the port in the list, for
* curiosity seekers.
*/
for (i = 0; i < IOPL_PORTS_USED_MAX; i++) {
if (iopl_ports_used[i] == io_port)
break; /* in list */
if (iopl_ports_used[i] == IO_REG_NULL) {
iopl_ports_used[i] = io_port;
iopl_ports_used[i+1] = IO_REG_NULL;
break;
}
}
return FALSE;
}
/*
* Emulate certain IO instructions for the AT bus.
*
* We emulate writes to the timer control port, 43.
* Only writes to timer 2 are allowed.
*
* Temporarily, we allow reads of any IO port,
* but ONLY if the thread has the IOPL device mapped
* and is not in V86 mode.
*
* This is a HACK and MUST go away when the DOS emulator
* emulates these IO ports, or when we decide that
* the DOS world can get access to all uncommitted IO
* ports. In that case, config() should remove the IO
* ports for devices it exists from the allowable list.
*/
boolean_t
iopl_emulate(regs, opcode, io_port)
struct i386_saved_state *regs;
int opcode;
int io_port;
{
iopb_tss_t iopb;
iopb = current_thread()->pcb->ims.io_tss;
if (iopb == 0)
return FALSE; /* no IO mapped */
/*
* Handle outb to the timer control port,
* for timer 2 only.
*/
if (io_port == PITCTL_PORT) {
int io_byte = regs->eax & 0xff;
if (((iopb->bitmap[PITCTR2_PORT >> 3] & (1 << (PITCTR2_PORT & 0x7)))
== 0) /* allowed */
&& (opcode == 0xe6 || opcode == 0xee) /* outb */
&& (io_byte & 0xc0) == 0x80) /* timer 2 */
{
outb(io_port, io_byte);
return TRUE;
}
return FALSE; /* invalid IO to port 42 */
}
/*
* If the thread has the IOPL device mapped, and
* the io port is not on the 'forbidden' list, allow
* reads from it. Reject writes.
*
* Don`t do this for V86 mode threads
* (hack for DOS emulator XXX!)
*/
if (!(regs->efl & EFL_VM) &&
iopb_check_mapping(current_thread(), iopl_device) &&
!iopl_port_forbidden(io_port))
{
/*
* handle inb, inw, inl
*/
switch (opcode) {
case 0xE4: /* inb imm */
case 0xEC: /* inb dx */
regs->eax = (regs->eax & 0xffffff00)
| inb(io_port);
return TRUE;
case 0x66E5: /* inw imm */
case 0x66ED: /* inw dx */
regs->eax = (regs->eax & 0xffff0000)
| inw(io_port);
return TRUE;
case 0xE5: /* inl imm */
case 0xED: /* inl dx */
regs->eax = inl(io_port);
return TRUE;
default:
return FALSE; /* OUT not allowed */
}
}
/*
* Not OK.
*/
return FALSE;
}
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