1/****************************************************************************
2*
3*                       Realmode X86 Emulator Library
4*
5*               Copyright (C) 1991-2004 SciTech Software, Inc.
6*                    Copyright (C) David Mosberger-Tang
7*                      Copyright (C) 1999 Egbert Eich
8*
9*  ========================================================================
10*
11*  Permission to use, copy, modify, distribute, and sell this software and
12*  its documentation for any purpose is hereby granted without fee,
13*  provided that the above copyright notice appear in all copies and that
14*  both that copyright notice and this permission notice appear in
15*  supporting documentation, and that the name of the authors not be used
16*  in advertising or publicity pertaining to distribution of the software
17*  without specific, written prior permission.  The authors makes no
18*  representations about the suitability of this software for any purpose.
19*  It is provided "as is" without express or implied warranty.
20*
21*  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
22*  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
23*  EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
24*  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
25*  USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
26*  OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
27*  PERFORMANCE OF THIS SOFTWARE.
28*
29*  ========================================================================
30*
31* Language:     ANSI C
32* Environment:  Any
33* Developer:    Kendall Bennett
34*
35* Description:  This file includes subroutines which are related to
36*               programmed I/O and memory access. Included in this module
37*               are default functions that do nothing. For real uses these
38*               functions will have to be overridden by the user library.
39*
40****************************************************************************/
41
42#include <common.h>
43#include <linux/printk.h>
44#include "x86emu/x86emui.h"
45
46/*------------------------- Global Variables ------------------------------*/
47
48/* Note: bios.c defines this if the emulator is not enabled */
49X86EMU_sysEnv _X86EMU_env;	/* Global emulator machine state */
50X86EMU_intrFuncs _X86EMU_intrTab[256];
51
52int debug_intr;
53
54/*----------------------------- Implementation ----------------------------*/
55
56/****************************************************************************
57PARAMETERS:
58addr    - Emulator memory address to read
59
60RETURNS:
61Byte value read from emulator memory.
62
63REMARKS:
64Reads a byte value from the emulator memory.
65****************************************************************************/
66u8 X86API rdb(u32 addr)
67{
68	return 0;
69}
70
71/****************************************************************************
72PARAMETERS:
73addr    - Emulator memory address to read
74
75RETURNS:
76Word value read from emulator memory.
77
78REMARKS:
79Reads a word value from the emulator memory.
80****************************************************************************/
81u16 X86API rdw(u32 addr)
82{
83	return 0;
84}
85
86/****************************************************************************
87PARAMETERS:
88addr    - Emulator memory address to read
89
90RETURNS:
91Long value read from emulator memory.
92REMARKS:
93Reads a long value from the emulator memory.
94****************************************************************************/
95u32 X86API rdl(u32 addr)
96{
97	return 0;
98}
99
100/****************************************************************************
101PARAMETERS:
102addr    - Emulator memory address to read
103val     - Value to store
104
105REMARKS:
106Writes a byte value to emulator memory.
107****************************************************************************/
108void X86API wrb(u32 addr, u8 val)
109{
110}
111
112/****************************************************************************
113PARAMETERS:
114addr    - Emulator memory address to read
115val     - Value to store
116
117REMARKS:
118Writes a word value to emulator memory.
119****************************************************************************/
120void X86API wrw(u32 addr, u16 val)
121{
122}
123
124/****************************************************************************
125PARAMETERS:
126addr    - Emulator memory address to read
127val     - Value to store
128
129REMARKS:
130Writes a long value to emulator memory.
131****************************************************************************/
132void X86API wrl(u32 addr, u32 val)
133{
134}
135
136/****************************************************************************
137PARAMETERS:
138addr    - PIO address to read
139RETURN:
1400
141REMARKS:
142Default PIO byte read function. Doesn't perform real inb.
143****************************************************************************/
144static u8 X86API p_inb(X86EMU_pioAddr addr)
145{
146	DB(if (DEBUG_IO_TRACE())
147	   printk("inb %#04x \n", addr);)
148		return 0;
149}
150
151/****************************************************************************
152PARAMETERS:
153addr    - PIO address to read
154RETURN:
1550
156REMARKS:
157Default PIO word read function. Doesn't perform real inw.
158****************************************************************************/
159static u16 X86API p_inw(X86EMU_pioAddr addr)
160{
161	DB(if (DEBUG_IO_TRACE())
162	   printk("inw %#04x \n", addr);)
163		return 0;
164}
165
166/****************************************************************************
167PARAMETERS:
168addr    - PIO address to read
169RETURN:
1700
171REMARKS:
172Default PIO long read function. Doesn't perform real inl.
173****************************************************************************/
174static u32 X86API p_inl(X86EMU_pioAddr addr)
175{
176	DB(if (DEBUG_IO_TRACE())
177	   printk("inl %#04x \n", addr);)
178		return 0;
179}
180
181/****************************************************************************
182PARAMETERS:
183addr    - PIO address to write
184val     - Value to store
185REMARKS:
186Default PIO byte write function. Doesn't perform real outb.
187****************************************************************************/
188static void X86API p_outb(X86EMU_pioAddr addr, u8 val)
189{
190	DB(if (DEBUG_IO_TRACE())
191	   printk("outb %#02x -> %#04x \n", val, addr);)
192		return;
193}
194
195/****************************************************************************
196PARAMETERS:
197addr    - PIO address to write
198val     - Value to store
199REMARKS:
200Default PIO word write function. Doesn't perform real outw.
201****************************************************************************/
202static void X86API p_outw(X86EMU_pioAddr addr, u16 val)
203{
204	DB(if (DEBUG_IO_TRACE())
205	   printk("outw %#04x -> %#04x \n", val, addr);)
206		return;
207}
208
209/****************************************************************************
210PARAMETERS:
211addr    - PIO address to write
212val     - Value to store
213REMARKS:
214Default PIO ;ong write function. Doesn't perform real outl.
215****************************************************************************/
216static void X86API p_outl(X86EMU_pioAddr addr, u32 val)
217{
218	DB(if (DEBUG_IO_TRACE())
219	   printk("outl %#08x -> %#04x \n", val, addr);)
220		return;
221}
222
223/*------------------------- Global Variables ------------------------------*/
224
225u8(X86APIP sys_rdb) (u32 addr) = rdb;
226u16(X86APIP sys_rdw) (u32 addr) = rdw;
227u32(X86APIP sys_rdl) (u32 addr) = rdl;
228void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb;
229void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw;
230void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl;
231u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb;
232u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw;
233u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl;
234void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb;
235void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw;
236void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl;
237
238/*----------------------------- Setup -------------------------------------*/
239
240/****************************************************************************
241PARAMETERS:
242funcs   - New memory function pointers to make active
243
244REMARKS:
245This function is used to set the pointers to functions which access
246memory space, allowing the user application to override these functions
247and hook them out as necessary for their application.
248****************************************************************************/
249void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs)
250{
251	sys_rdb = funcs->rdb;
252	sys_rdw = funcs->rdw;
253	sys_rdl = funcs->rdl;
254	sys_wrb = funcs->wrb;
255	sys_wrw = funcs->wrw;
256	sys_wrl = funcs->wrl;
257}
258
259/****************************************************************************
260PARAMETERS:
261funcs   - New programmed I/O function pointers to make active
262
263REMARKS:
264This function is used to set the pointers to functions which access
265I/O space, allowing the user application to override these functions
266and hook them out as necessary for their application.
267****************************************************************************/
268void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs)
269{
270	sys_inb = funcs->inb;
271	sys_inw = funcs->inw;
272	sys_inl = funcs->inl;
273	sys_outb = funcs->outb;
274	sys_outw = funcs->outw;
275	sys_outl = funcs->outl;
276}
277
278void X86EMU_setupIntrFunc(int intnum, X86EMU_intrFuncs func)
279{
280	_X86EMU_intrTab[intnum] = func;
281}
282
283/****************************************************************************
284PARAMETERS:
285funcs   - New interrupt vector table to make active
286
287REMARKS:
288This function is used to set the pointers to functions which handle
289interrupt processing in the emulator, allowing the user application to
290hook interrupts as necessary for their application. Any interrupts that
291are not hooked by the user application, and reflected and handled internally
292in the emulator via the interrupt vector table. This allows the application
293to get control when the code being emulated executes specific software
294interrupts.
295****************************************************************************/
296void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[])
297{
298	int i;
299
300	for (i = 0; i < 256; i++)
301		_X86EMU_intrTab[i] = NULL;
302	if (funcs) {
303		for (i = 0; i < 256; i++)
304			_X86EMU_intrTab[i] = funcs[i];
305	}
306}
307
308/****************************************************************************
309PARAMETERS:
310int - New software interrupt to prepare for
311
312REMARKS:
313This function is used to set up the emulator state to exceute a software
314interrupt. This can be used by the user application code to allow an
315interrupt to be hooked, examined and then reflected back to the emulator
316so that the code in the emulator will continue processing the software
317interrupt as per normal. This essentially allows system code to actively
318hook and handle certain software interrupts as necessary.
319****************************************************************************/
320void X86EMU_prepareForInt(int num)
321{
322	push_word((u16) M.x86.R_FLG);
323	CLEAR_FLAG(F_IF);
324	CLEAR_FLAG(F_TF);
325	push_word(M.x86.R_CS);
326	M.x86.R_CS = mem_access_word(num * 4 + 2);
327	push_word(M.x86.R_IP);
328	M.x86.R_IP = mem_access_word(num * 4);
329	M.x86.intr = 0;
330}
331