blob: 82befbae66f7b54b4fa23e86bf8f57635d61501e [file] [log] [blame]
Jason Jinece92f82007-07-06 08:34:56 +08001/****************************************************************************
2*
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +02003* BIOS emulator and interface
4* to Realmode X86 Emulator Library
Jason Jinece92f82007-07-06 08:34:56 +08005*
Kumar Gala4c2e3da2009-07-28 21:49:52 -05006* Copyright (C) 2007 Freescale Semiconductor, Inc.
Jason Jinece92f82007-07-06 08:34:56 +08007* Jason Jin <Jason.jin@freescale.com>
8*
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +02009* Copyright (C) 1996-1999 SciTech Software, Inc.
Jason Jinece92f82007-07-06 08:34:56 +080010*
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
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020019* without specific, written prior permission. The authors makes no
Jason Jinece92f82007-07-06 08:34:56 +080020* 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*
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020033* Language: ANSI C
34* Environment: Any
35* Developer: Kendall Bennett
Jason Jinece92f82007-07-06 08:34:56 +080036*
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020037* 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.
Jason Jinece92f82007-07-06 08:34:56 +080040*
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020041* 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.
Jason Jinece92f82007-07-06 08:34:56 +080045*
46****************************************************************************/
47
Jason Jinece92f82007-07-06 08:34:56 +080048#include <malloc.h>
Michal Simek78cff502007-08-16 10:46:28 +020049#include <common.h>
Michal Simek5b4de932007-08-15 21:15:05 +020050#include "biosemui.h"
51
Jason Jinece92f82007-07-06 08:34:56 +080052BE_sysEnv _BE_env = {{0}};
Marek BehĂșn236f2ec2021-05-20 13:23:52 +020053static X86EMU_memFuncs _BE_mem __section(GOT2_TYPE) = {
Jason Jinece92f82007-07-06 08:34:56 +080054 BE_rdb,
55 BE_rdw,
56 BE_rdl,
57 BE_wrb,
58 BE_wrw,
59 BE_wrl,
60 };
61
Marek BehĂșn236f2ec2021-05-20 13:23:52 +020062static X86EMU_pioFuncs _BE_pio __section(GOT2_TYPE) = {
Jason Jinece92f82007-07-06 08:34:56 +080063 BE_inb,
64 BE_inw,
65 BE_inl,
66 BE_outb,
67 BE_outw,
68 BE_outl,
69 };
70
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020071#define OFF(addr) (u16)(((addr) >> 0) & 0xffff)
72#define SEG(addr) (u16)(((addr) >> 4) & 0xf000)
Jason Jinece92f82007-07-06 08:34:56 +080073
74/****************************************************************************
75PARAMETERS:
76debugFlags - Flags to enable debugging options (debug builds only)
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +020077memSize - Amount of memory to allocate for real mode machine
78info - Pointer to default VGA device information
Jason Jinece92f82007-07-06 08:34:56 +080079
80REMARKS:
81This functions initialises the BElib, and uses the passed in
82BIOS image as the BIOS that is used and emulated at 0xC0000.
83****************************************************************************/
84int 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
Wolfgang Denk409ecdc2007-11-18 16:36:27 +010096 M.mem_base = malloc(memSize);
Jason Jinece92f82007-07-06 08:34:56 +080097
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);
Wolfgang Denk409ecdc2007-11-18 16:36:27 +0100106 if ((void *)_BE_env.busmem_base == NULL){
Jason Jinece92f82007-07-06 08:34:56 +0800107 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/****************************************************************************
119PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200120info - Pointer to VGA device information to make current
Jason Jinece92f82007-07-06 08:34:56 +0800121
122REMARKS:
123This function sets the VGA BIOS functions in the emulator to point to the
124specific VGA BIOS in use. This includes swapping the BIOS interrupt
125vectors, BIOS image and BIOS data area to the new BIOS. This allows the
126real mode BIOS to be swapped without resetting the entire emulator.
127****************************************************************************/
128void 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 }
Kumar Gala51d91e12009-07-13 09:23:59 -0500147 if ((info->LowMem[0] == 0) && (info->LowMem[1] == 0) &&
148 (info->LowMem[2] == 0) && (info->LowMem[3] == 0))
Jason Jinece92f82007-07-06 08:34:56 +0800149 _BE_bios_init((u32 *) info->LowMem);
150 memcpy((u8 *) M.mem_base, info->LowMem, sizeof(info->LowMem));
151}
152
153/****************************************************************************
154PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200155info - Pointer to VGA device information to retrieve current
Jason Jinece92f82007-07-06 08:34:56 +0800156
157REMARKS:
158This function returns the VGA BIOS functions currently active in the
159emulator, so they can be restored at a later date.
160****************************************************************************/
161void 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/****************************************************************************
176PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200177r_seg - Segment for pointer to convert
178r_off - Offset for pointer to convert
Jason Jinece92f82007-07-06 08:34:56 +0800179
180REMARKS:
181This function maps a real mode pointer in the emulator memory to a protected
182mode pointer that can be used to directly access the memory.
183
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200184NOTE: 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.
Jason Jinece92f82007-07-06 08:34:56 +0800187****************************************************************************/
188void *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/****************************************************************************
201PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200202len - Return the length of the VESA buffer
203rseg - Place to store VESA buffer segment
204roff - Place to store VESA buffer offset
Jason Jinece92f82007-07-06 08:34:56 +0800205
206REMARKS:
207This 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,
209and located at 15Kb into the start of the real mode memory (16Kb is where
210we put the real mode code we execute for issuing interrupts).
211
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200212NOTE: 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.
Jason Jinece92f82007-07-06 08:34:56 +0800215****************************************************************************/
216void *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/****************************************************************************
225REMARKS:
226Cleans up and exits the emulator.
227****************************************************************************/
228void X86API BE_exit(void)
229{
230 free(M.mem_base);
Wolfgang Denk409ecdc2007-11-18 16:36:27 +0100231 free((void *)_BE_env.busmem_base);
Jason Jinece92f82007-07-06 08:34:56 +0800232}
233
234/****************************************************************************
235PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200236seg - Segment of code to call
237off - Offset of code to call
238regs - Real mode registers to load
239sregs - Real mode segment registers to load
Jason Jinece92f82007-07-06 08:34:56 +0800240
241REMARKS:
242This functions calls a real mode far function at the specified address,
243and loads all the x86 registers from the passed in registers structure.
244On exit the registers returned from the call are returned in the same
245structures.
246****************************************************************************/
247void 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/****************************************************************************
288PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200289intno - Interrupt number to execute
290in - Real mode registers to load
291out - Place to store resulting real mode registers
Jason Jinece92f82007-07-06 08:34:56 +0800292
293REMARKS:
294This functions calls a real mode interrupt function at the specified address,
295and loads all the x86 registers from the passed in registers structure.
296On exit the registers returned from the call are returned in out stucture.
297****************************************************************************/
298int 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/****************************************************************************
327PARAMETERS:
Wolfgang Denk9c7e4b02007-08-06 02:17:36 +0200328intno - Interrupt number to execute
329in - Real mode registers to load
330out - Place to store resulting real mode registers
331sregs - Real mode segment registers to load
Jason Jinece92f82007-07-06 08:34:56 +0800332
333REMARKS:
334This functions calls a real mode interrupt function at the specified address,
335and loads all the x86 registers from the passed in registers structure.
336On exit the registers returned from the call are returned in out stucture.
337****************************************************************************/
338int 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}