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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;
+}
+