1 /****************************************************************************
2 *
3 * BIOS emulator and interface
4 * to Realmode X86 Emulator Library
5 *
6 * Copyright (C) 2007 Freescale Semiconductor, Inc.
7 * Jason Jin <Jason.jin@freescale.com>
8 *
9 * Copyright (C) 1996-1999 SciTech Software, Inc.
10 *
11 * ========================================================================
12 *
13 * Permission to use, copy, modify, distribute, and sell this software and
14 * its documentation for any purpose is hereby granted without fee,
15 * provided that the above copyright notice appear in all copies and that
16 * both that copyright notice and this permission notice appear in
17 * supporting documentation, and that the name of the authors not be used
18 * in advertising or publicity pertaining to distribution of the software
19 * without specific, written prior permission. The authors makes no
20 * representations about the suitability of this software for any purpose.
21 * It is provided "as is" without express or implied warranty.
22 *
23 * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
24 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
25 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
26 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
27 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
28 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
29 * PERFORMANCE OF THIS SOFTWARE.
30 *
31 * ========================================================================
32 *
33 * Language: ANSI C
34 * Environment: Any
35 * Developer: Kendall Bennett
36 *
37 * Description: Module implementing the system specific functions. This
38 * module is always compiled and linked in the OS depedent
39 * libraries, and never in a binary portable driver.
40 *
41 * Jason ported this file to u-boot to run the ATI video card BIOS
42 * in u-boot. Made all the video memory be emulated during the
43 * BIOS runing process which may affect the VGA function but the
44 * frambuffer function can work after run the BIOS.
45 *
46 ****************************************************************************/
47
48 #include <malloc.h>
49 #include <common.h>
50 #include "biosemui.h"
51
52 BE_sysEnv _BE_env = {{0}};
53 static X86EMU_memFuncs _BE_mem __attribute__((section(GOT2_TYPE))) = {
54 BE_rdb,
55 BE_rdw,
56 BE_rdl,
57 BE_wrb,
58 BE_wrw,
59 BE_wrl,
60 };
61
62 static X86EMU_pioFuncs _BE_pio __attribute__((section(GOT2_TYPE))) = {
63 BE_inb,
64 BE_inw,
65 BE_inl,
66 BE_outb,
67 BE_outw,
68 BE_outl,
69 };
70
71 #define OFF(addr) (u16)(((addr) >> 0) & 0xffff)
72 #define SEG(addr) (u16)(((addr) >> 4) & 0xf000)
73
74 /****************************************************************************
75 PARAMETERS:
76 debugFlags - Flags to enable debugging options (debug builds only)
77 memSize - Amount of memory to allocate for real mode machine
78 info - Pointer to default VGA device information
79
80 REMARKS:
81 This functions initialises the BElib, and uses the passed in
82 BIOS image as the BIOS that is used and emulated at 0xC0000.
83 ****************************************************************************/
BE_init(u32 debugFlags,int memSize,BE_VGAInfo * info,int shared)84 int X86API BE_init(u32 debugFlags, int memSize, BE_VGAInfo * info, int shared)
85 {
86 #if !defined(__DRIVER__) && !defined(__KERNEL__)
87
88 PM_init();
89 #endif
90 memset(&M, 0, sizeof(M));
91 if (memSize < 20480){
92 printf("Emulator requires at least 20Kb of memory!\n");
93 return 0;
94 }
95
96 M.mem_base = malloc(memSize);
97
98 if (M.mem_base == NULL){
99 printf("Biosemu:Out of memory!");
100 return 0;
101 }
102 M.mem_size = memSize;
103
104 _BE_env.emulateVGA = 0;
105 _BE_env.busmem_base = (unsigned long)malloc(128 * 1024);
106 if ((void *)_BE_env.busmem_base == NULL){
107 printf("Biosemu:Out of memory!");
108 return 0;
109 }
110 M.x86.debug = debugFlags;
111 _BE_bios_init((u32*)info->LowMem);
112 X86EMU_setupMemFuncs(&_BE_mem);
113 X86EMU_setupPioFuncs(&_BE_pio);
114 BE_setVGA(info);
115 return 1;
116 }
117
118 /****************************************************************************
119 PARAMETERS:
120 info - Pointer to VGA device information to make current
121
122 REMARKS:
123 This function sets the VGA BIOS functions in the emulator to point to the
124 specific VGA BIOS in use. This includes swapping the BIOS interrupt
125 vectors, BIOS image and BIOS data area to the new BIOS. This allows the
126 real mode BIOS to be swapped without resetting the entire emulator.
127 ****************************************************************************/
BE_setVGA(BE_VGAInfo * info)128 void X86API BE_setVGA(BE_VGAInfo * info)
129 {
130
131 #ifdef __KERNEL__
132 _BE_env.vgaInfo.function = info->function;
133 _BE_env.vgaInfo.device = info->device;
134 _BE_env.vgaInfo.bus = info->bus;
135 _BE_env.vgaInfo.pcidev = info->pcidev;
136 #else
137 _BE_env.vgaInfo.pciInfo = info->pciInfo;
138 #endif
139 _BE_env.vgaInfo.BIOSImage = info->BIOSImage;
140 if (info->BIOSImage) {
141 _BE_env.biosmem_base = (ulong) info->BIOSImage;
142 _BE_env.biosmem_limit = 0xC0000 + info->BIOSImageLen - 1;
143 } else {
144 _BE_env.biosmem_base = _BE_env.busmem_base + 0x20000;
145 _BE_env.biosmem_limit = 0xC7FFF;
146 }
147 if ((info->LowMem[0] == 0) && (info->LowMem[1] == 0) &&
148 (info->LowMem[2] == 0) && (info->LowMem[3] == 0))
149 _BE_bios_init((u32 *) info->LowMem);
150 memcpy((u8 *) M.mem_base, info->LowMem, sizeof(info->LowMem));
151 }
152
153 /****************************************************************************
154 PARAMETERS:
155 info - Pointer to VGA device information to retrieve current
156
157 REMARKS:
158 This function returns the VGA BIOS functions currently active in the
159 emulator, so they can be restored at a later date.
160 ****************************************************************************/
BE_getVGA(BE_VGAInfo * info)161 void X86API BE_getVGA(BE_VGAInfo * info)
162 {
163 #ifdef __KERNEL__
164 info->function = _BE_env.vgaInfo.function;
165 info->device = _BE_env.vgaInfo.device;
166 info->bus = _BE_env.vgaInfo.bus;
167 info->pcidev = _BE_env.vgaInfo.pcidev;
168 #else
169 info->pciInfo = _BE_env.vgaInfo.pciInfo;
170 #endif
171 info->BIOSImage = _BE_env.vgaInfo.BIOSImage;
172 memcpy(info->LowMem, (u8 *) M.mem_base, sizeof(info->LowMem));
173 }
174
175 /****************************************************************************
176 PARAMETERS:
177 r_seg - Segment for pointer to convert
178 r_off - Offset for pointer to convert
179
180 REMARKS:
181 This function maps a real mode pointer in the emulator memory to a protected
182 mode pointer that can be used to directly access the memory.
183
184 NOTE: The memory is *always* in little endian format, son on non-x86
185 systems you will need to do endian translations to access this
186 memory.
187 ****************************************************************************/
BE_mapRealPointer(uint r_seg,uint r_off)188 void *X86API BE_mapRealPointer(uint r_seg, uint r_off)
189 {
190 u32 addr = ((u32) r_seg << 4) + r_off;
191
192 if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
193 return (void *)(_BE_env.biosmem_base + addr - 0xC0000);
194 } else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
195 return (void *)(_BE_env.busmem_base + addr - 0xA0000);
196 }
197 return (void *)(M.mem_base + addr);
198 }
199
200 /****************************************************************************
201 PARAMETERS:
202 len - Return the length of the VESA buffer
203 rseg - Place to store VESA buffer segment
204 roff - Place to store VESA buffer offset
205
206 REMARKS:
207 This function returns the address of the VESA transfer buffer in real
208 _BE_piomode emulator memory. The VESA transfer buffer is always 1024 bytes long,
209 and located at 15Kb into the start of the real mode memory (16Kb is where
210 we put the real mode code we execute for issuing interrupts).
211
212 NOTE: The memory is *always* in little endian format, son on non-x86
213 systems you will need to do endian translations to access this
214 memory.
215 ****************************************************************************/
BE_getVESABuf(uint * len,uint * rseg,uint * roff)216 void *X86API BE_getVESABuf(uint * len, uint * rseg, uint * roff)
217 {
218 *len = 1024;
219 *rseg = SEG(0x03C00);
220 *roff = OFF(0x03C00);
221 return (void *)(M.mem_base + ((u32) * rseg << 4) + *roff);
222 }
223
224 /****************************************************************************
225 REMARKS:
226 Cleans up and exits the emulator.
227 ****************************************************************************/
BE_exit(void)228 void X86API BE_exit(void)
229 {
230 free(M.mem_base);
231 free((void *)_BE_env.busmem_base);
232 }
233
234 /****************************************************************************
235 PARAMETERS:
236 seg - Segment of code to call
237 off - Offset of code to call
238 regs - Real mode registers to load
239 sregs - Real mode segment registers to load
240
241 REMARKS:
242 This functions calls a real mode far function at the specified address,
243 and loads all the x86 registers from the passed in registers structure.
244 On exit the registers returned from the call are returned in the same
245 structures.
246 ****************************************************************************/
BE_callRealMode(uint seg,uint off,RMREGS * regs,RMSREGS * sregs)247 void X86API BE_callRealMode(uint seg, uint off, RMREGS * regs, RMSREGS * sregs)
248 {
249 M.x86.R_EAX = regs->e.eax;
250 M.x86.R_EBX = regs->e.ebx;
251 M.x86.R_ECX = regs->e.ecx;
252 M.x86.R_EDX = regs->e.edx;
253 M.x86.R_ESI = regs->e.esi;
254 M.x86.R_EDI = regs->e.edi;
255 M.x86.R_DS = sregs->ds;
256 M.x86.R_ES = sregs->es;
257 M.x86.R_FS = sregs->fs;
258 M.x86.R_GS = sregs->gs;
259
260 ((u8 *) M.mem_base)[0x4000] = 0x9A;
261 ((u8 *) M.mem_base)[0x4001] = (u8) off;
262 ((u8 *) M.mem_base)[0x4002] = (u8) (off >> 8);
263 ((u8 *) M.mem_base)[0x4003] = (u8) seg;
264 ((u8 *) M.mem_base)[0x4004] = (u8) (seg >> 8);
265 ((u8 *) M.mem_base)[0x4005] = 0xF1; /* Illegal op-code */
266 M.x86.R_CS = SEG(0x04000);
267 M.x86.R_IP = OFF(0x04000);
268
269 M.x86.R_SS = SEG(M.mem_size - 2);
270 M.x86.R_SP = OFF(M.mem_size - 2) + 2;
271
272 X86EMU_exec();
273
274 regs->e.cflag = M.x86.R_EFLG & F_CF;
275 regs->e.eax = M.x86.R_EAX;
276 regs->e.ebx = M.x86.R_EBX;
277 regs->e.ecx = M.x86.R_ECX;
278 regs->e.edx = M.x86.R_EDX;
279 regs->e.esi = M.x86.R_ESI;
280 regs->e.edi = M.x86.R_EDI;
281 sregs->ds = M.x86.R_DS;
282 sregs->es = M.x86.R_ES;
283 sregs->fs = M.x86.R_FS;
284 sregs->gs = M.x86.R_GS;
285 }
286
287 /****************************************************************************
288 PARAMETERS:
289 intno - Interrupt number to execute
290 in - Real mode registers to load
291 out - Place to store resulting real mode registers
292
293 REMARKS:
294 This functions calls a real mode interrupt function at the specified address,
295 and loads all the x86 registers from the passed in registers structure.
296 On exit the registers returned from the call are returned in out stucture.
297 ****************************************************************************/
BE_int86(int intno,RMREGS * in,RMREGS * out)298 int X86API BE_int86(int intno, RMREGS * in, RMREGS * out)
299 {
300 M.x86.R_EAX = in->e.eax;
301 M.x86.R_EBX = in->e.ebx;
302 M.x86.R_ECX = in->e.ecx;
303 M.x86.R_EDX = in->e.edx;
304 M.x86.R_ESI = in->e.esi;
305 M.x86.R_EDI = in->e.edi;
306 ((u8 *) M.mem_base)[0x4000] = 0xCD;
307 ((u8 *) M.mem_base)[0x4001] = (u8) intno;
308 ((u8 *) M.mem_base)[0x4002] = 0xF1;
309 M.x86.R_CS = SEG(0x04000);
310 M.x86.R_IP = OFF(0x04000);
311
312 M.x86.R_SS = SEG(M.mem_size - 1);
313 M.x86.R_SP = OFF(M.mem_size - 1) - 1;
314
315 X86EMU_exec();
316 out->e.cflag = M.x86.R_EFLG & F_CF;
317 out->e.eax = M.x86.R_EAX;
318 out->e.ebx = M.x86.R_EBX;
319 out->e.ecx = M.x86.R_ECX;
320 out->e.edx = M.x86.R_EDX;
321 out->e.esi = M.x86.R_ESI;
322 out->e.edi = M.x86.R_EDI;
323 return out->x.ax;
324 }
325
326 /****************************************************************************
327 PARAMETERS:
328 intno - Interrupt number to execute
329 in - Real mode registers to load
330 out - Place to store resulting real mode registers
331 sregs - Real mode segment registers to load
332
333 REMARKS:
334 This functions calls a real mode interrupt function at the specified address,
335 and loads all the x86 registers from the passed in registers structure.
336 On exit the registers returned from the call are returned in out stucture.
337 ****************************************************************************/
BE_int86x(int intno,RMREGS * in,RMREGS * out,RMSREGS * sregs)338 int X86API BE_int86x(int intno, RMREGS * in, RMREGS * out, RMSREGS * sregs)
339 {
340 M.x86.R_EAX = in->e.eax;
341 M.x86.R_EBX = in->e.ebx;
342 M.x86.R_ECX = in->e.ecx;
343 M.x86.R_EDX = in->e.edx;
344 M.x86.R_ESI = in->e.esi;
345 M.x86.R_EDI = in->e.edi;
346 M.x86.R_DS = sregs->ds;
347 M.x86.R_ES = sregs->es;
348 M.x86.R_FS = sregs->fs;
349 M.x86.R_GS = sregs->gs;
350 ((u8 *) M.mem_base)[0x4000] = 0xCD;
351 ((u8 *) M.mem_base)[0x4001] = (u8) intno;
352 ((u8 *) M.mem_base)[0x4002] = 0xF1;
353 M.x86.R_CS = SEG(0x04000);
354 M.x86.R_IP = OFF(0x04000);
355
356 M.x86.R_SS = SEG(M.mem_size - 1);
357 M.x86.R_SP = OFF(M.mem_size - 1) - 1;
358
359 X86EMU_exec();
360 out->e.cflag = M.x86.R_EFLG & F_CF;
361 out->e.eax = M.x86.R_EAX;
362 out->e.ebx = M.x86.R_EBX;
363 out->e.ecx = M.x86.R_ECX;
364 out->e.edx = M.x86.R_EDX;
365 out->e.esi = M.x86.R_ESI;
366 out->e.edi = M.x86.R_EDI;
367 sregs->ds = M.x86.R_DS;
368 sregs->es = M.x86.R_ES;
369 sregs->fs = M.x86.R_FS;
370 sregs->gs = M.x86.R_GS;
371 return out->x.ax;
372 }
373