summaryrefslogtreecommitdiff
path: root/util/x86emu/yabel/biosemu.c
blob: 04c440d0a67ea60213ce77131feeab0aa62b91f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
/******************************************************************************
 * Copyright (c) 2004, 2008 IBM Corporation
 * Copyright (c) 2008, 2009 Pattrick Hueper <phueper@hueper.net>
 * All rights reserved.
 * This program and the accompanying materials
 * are made available under the terms of the BSD License
 * which accompanies this distribution, and is available at
 * http://www.opensource.org/licenses/bsd-license.php
 *
 * Contributors:
 *     IBM Corporation - initial implementation
 *****************************************************************************/

#include <string.h>

#include <types.h>
#ifndef CONFIG_COREBOOT_V2
#include <cpu.h>
#endif

#include "debug.h"

#include <x86emu/x86emu.h>
#include <x86emu/regs.h>
#ifdef CONFIG_COREBOOT_V2
#include "../x86emu/prim_ops.h"
#else
#include <x86emu/prim_ops.h>	// for push_word
#endif

#include "biosemu.h"
#include "io.h"
#include "mem.h"
#include "interrupt.h"
#include "device.h"
#include "pmm.h"

#ifdef CONFIG_COREBOOT_V2
#include "compat/rtas.h"
#else
#include <rtas.h>
#endif

#include <device/device.h>

static X86EMU_memFuncs my_mem_funcs = {
	my_rdb, my_rdw, my_rdl,
	my_wrb, my_wrw, my_wrl
};

static X86EMU_pioFuncs my_pio_funcs = {
	my_inb, my_inw, my_inl,
	my_outb, my_outw, my_outl
};

/* interrupt function override array (see biosemu.h) */
yabel_handleIntFunc yabel_intFuncArray[256];

/* main entry into YABEL biosemu, arguments are:
 * *biosmem = pointer to virtual memory
 * biosmem_size = size of the virtual memory
 * *dev = pointer to the device to be initialised
 * rom_addr = address of the OptionROM to be executed, if this is = 0, YABEL
 * 	will look for an ExpansionROM BAR and use the code from there.
 */
u32
biosemu(u8 *biosmem, u32 biosmem_size, struct device * dev, unsigned long rom_addr)
{
	u8 *rom_image;
	int i = 0;
#ifdef CONFIG_DEBUG
	debug_flags = 0;//DEBUG_PRINT_INT10 | DEBUG_PNP | DEBUG_INTR | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO;
		// | DEBUG_CHECK_VMEM_ACCESS | DEBUG_MEM | DEBUG_IO;
		// | DEBUG_TRACE_X86EMU | DEBUG_JMP;

	/* use CONFIG_YABEL_DEBUG_FLAGS, too... */
	debug_flags |= CONFIG_YABEL_DEBUG_FLAGS;
#endif
	if (biosmem_size < MIN_REQUIRED_VMEM_SIZE) {
		printf("Error: Not enough virtual memory: %x, required: %x!\n",
		       biosmem_size, MIN_REQUIRED_VMEM_SIZE);
		return -1;
	}
	if (biosemu_dev_init(dev) != 0) {
		printf("Error initializing device!\n");
		return -1;
	}
	if (biosemu_dev_check_exprom(rom_addr) != 0) {
		printf("Error: Device Expansion ROM invalid!\n");
		return -1;
	}
	rom_image = (u8 *) bios_device.img_addr;
	DEBUG_PRINTF("executing rom_image from %p\n", rom_image);
	DEBUG_PRINTF("biosmem at %p\n", biosmem);

	DEBUG_PRINTF("Image Size: %d\n", bios_device.img_size);

	// in case we jump somewhere unexpected, or execution is finished,
	// fill the biosmem with hlt instructions (0xf4)
	memset(biosmem, 0xf4, biosmem_size);

	M.mem_base = (long) biosmem;
	M.mem_size = biosmem_size;
	DEBUG_PRINTF("membase set: %08x, size: %08x\n", (int) M.mem_base,
		     (int) M.mem_size);

	// copy expansion ROM image to segment OPTION_ROM_CODE_SEGMENT
	// NOTE: this sometimes fails, some bytes are 0x00... so we compare
	// after copying and do some retries...
	u8 *mem_img = biosmem + (OPTION_ROM_CODE_SEGMENT << 4);
	u8 copy_count = 0;
	u8 cmp_result = 0;
	do {
#if 0
		set_ci();
		memcpy(mem_img, rom_image, len);
		clr_ci();
#else
		// memcpy fails... try copy byte-by-byte with set/clr_ci
		u8 c;
		for (i = 0; i < bios_device.img_size; i++) {
			set_ci();
			c = *(rom_image + i);
			if (c != *(rom_image + i)) {
				clr_ci();
				printf("Copy failed at: %x/%x\n", i,
				       bios_device.img_size);
				printf("rom_image(%x): %x, mem_img(%x): %x\n",
				       i, *(rom_image + i), i, *(mem_img + i));
				break;
			}
			clr_ci();
			*(mem_img + i) = c;
		}
#endif
		copy_count++;
		set_ci();
		cmp_result = memcmp(mem_img, rom_image, bios_device.img_size);
		clr_ci();
	}
	while ((copy_count < 5) && (cmp_result != 0));
	if (cmp_result != 0) {
		printf
		    ("\nCopying Expansion ROM Image to Memory failed after %d retries! (%x)\n",
		     copy_count, cmp_result);
		dump(rom_image, 0x20);
		dump(mem_img, 0x20);
		return 0;
	}
	// setup default Interrupt Vectors
	// some expansion ROMs seem to check for these addresses..
	// each handler is only an IRET (0xCF) instruction
	// ROM BIOS Int 10 Handler F000:F065
	my_wrl(0x10 * 4, 0xf000f065);
	my_wrb(0x000ff065, 0xcf);
	// ROM BIOS Int 11 Handler F000:F84D
	my_wrl(0x11 * 4, 0xf000f84d);
	my_wrb(0x000ff84d, 0xcf);
	// ROM BIOS Int 12 Handler F000:F841
	my_wrl(0x12 * 4, 0xf000f841);
	my_wrb(0x000ff841, 0xcf);
	// ROM BIOS Int 13 Handler F000:EC59
	my_wrl(0x13 * 4, 0xf000ec59);
	my_wrb(0x000fec59, 0xcf);
	// ROM BIOS Int 14 Handler F000:E739
	my_wrl(0x14 * 4, 0xf000e739);
	my_wrb(0x000fe739, 0xcf);
	// ROM BIOS Int 15 Handler F000:F859
	my_wrl(0x15 * 4, 0xf000f859);
	my_wrb(0x000ff859, 0xcf);
	// ROM BIOS Int 16 Handler F000:E82E
	my_wrl(0x16 * 4, 0xf000e82e);
	my_wrb(0x000fe82e, 0xcf);
	// ROM BIOS Int 17 Handler F000:EFD2
	my_wrl(0x17 * 4, 0xf000efd2);
	my_wrb(0x000fefd2, 0xcf);
	// ROM BIOS Int 1A Handler F000:FE6E
	my_wrl(0x1a * 4, 0xf000fe6e);
	my_wrb(0x000ffe6e, 0xcf);

	// setup BIOS Data Area (0000:04xx, or 0040:00xx)
	// we currently 0 this area, meaning "we dont have
	// any hardware" :-) no serial/parallel ports, floppys, ...
	memset(biosmem + 0x400, 0x0, 0x100);

	// at offset 13h in BDA is the memory size in kbytes
	my_wrw(0x413, biosmem_size / 1024);
	// at offset 0eh in BDA is the segment of the Extended BIOS Data Area
	// see setup further down
	my_wrw(0x40e, INITIAL_EBDA_SEGMENT);
	// TODO: setup BDA Video Data ( offset 49h-66h)
	// e.g. to store video mode, cursor position, ...
	// in int10 (done) handler and VBE Functions

	// TODO: setup BDA Fixed Disk Data
	// 74h: Fixed Disk Last Operation Status
	// 75h: Fixed Disk Number of Disk Drives

	// TODO: check BDA for further needed data...

	//setup Extended BIOS Data Area
	//we currently 0 this area
	memset(biosmem + (INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE);
	// at offset 0h in EBDA is the size of the EBDA in KB
	my_wrw((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024);
	//TODO: check for further needed EBDA data...

	// setup  original ROM BIOS Area (F000:xxxx)
	char *date = "06/11/99";
	for (i = 0; date[i]; i++)
		my_wrb(0xffff5 + i, date[i]);
	// set up eisa ident string
	char *ident = "PCI_ISA";
	for (i = 0; ident[i]; i++)
		my_wrb(0xfffd9 + i, ident[i]);

	// write system model id for IBM-AT
	// according to "Ralf Browns Interrupt List" Int15 AH=C0 Table 515,
	// model FC is the original AT and also used in all DOSEMU Versions.
	my_wrb(0xFFFFE, 0xfc);

	//setup interrupt handler
	X86EMU_intrFuncs intrFuncs[256];
	for (i = 0; i < 256; i++)
		intrFuncs[i] = handleInterrupt;
	X86EMU_setupIntrFuncs(intrFuncs);
	X86EMU_setupPioFuncs(&my_pio_funcs);
	X86EMU_setupMemFuncs(&my_mem_funcs);

	//setup PMM struct in BIOS_DATA_SEGMENT, offset 0x0
	u8 pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0);	
	if (pmm_length <= 0) {
		printf ("\nYABEL: Warning: PMM Area could not be setup. PMM not available (%x)\n",
		     pmm_length);
		return 0;
	} else {
		CHECK_DBG(DEBUG_PMM) {
			/* test the PMM */
			pmm_test();
			/* and clean it again by calling pmm_setup... */
			pmm_length = pmm_setup(BIOS_DATA_SEGMENT, 0x0);
		}
	}
	// setup the CPU
	M.x86.R_AH = bios_device.bus;
	M.x86.R_AL = bios_device.devfn;
	M.x86.R_DX = 0x80;
	M.x86.R_EIP = 3;
	M.x86.R_CS = OPTION_ROM_CODE_SEGMENT;

	// Initialize stack and data segment
	M.x86.R_SS = STACK_SEGMENT;
	M.x86.R_SP = STACK_START_OFFSET;
	M.x86.R_DS = DATA_SEGMENT;

	// push a HLT instruction and a pointer to it onto the stack
	// any return will pop the pointer and jump to the HLT, thus
	// exiting (more or less) cleanly
	push_word(0xf4f4);	//F4=HLT
	push_word(M.x86.R_SS);
	push_word(M.x86.R_SP + 2);

	CHECK_DBG(DEBUG_TRACE_X86EMU) {
		X86EMU_trace_on();
	} else {
#ifdef CONFIG_DEBUG
		M.x86.debug |= DEBUG_SAVE_IP_CS_F;
		M.x86.debug |= DEBUG_DECODE_F;
		M.x86.debug |= DEBUG_DECODE_NOPRINT_F;
#endif
	}
	CHECK_DBG(DEBUG_JMP) {
		M.x86.debug |= DEBUG_TRACEJMP_F;
		M.x86.debug |= DEBUG_TRACEJMP_REGS_F;
		M.x86.debug |= DEBUG_TRACECALL_F;
		M.x86.debug |= DEBUG_TRACECALL_REGS_F;
		}

	DEBUG_PRINTF("Executing Initialization Vector...\n");
	X86EMU_exec();
	DEBUG_PRINTF("done\n");

	/* According to the PNP BIOS Spec, Option ROMs should upon exit, return
	 * some boot device status in AX (see PNP BIOS Spec Section 3.3
	 */
	DEBUG_PRINTF_CS_IP("Option ROM Exit Status: %04x\n", M.x86.R_AX);
#ifdef CONFIG_DEBUG
	DEBUG_PRINTF("Exit Status Decode:\n");
	if (M.x86.R_AX & 0x100) {	// bit 8
		DEBUG_PRINTF
		    ("  IPL Device supporting INT 13h Block Device Format:\n");
		switch (((M.x86.R_AX >> 4) & 0x3)) {	// bits 5:4
		case 0:
			DEBUG_PRINTF("    No IPL Device attached\n");
			break;
		case 1:
			DEBUG_PRINTF("    IPL Device status unknown\n");
			break;
		case 2:
			DEBUG_PRINTF("    IPL Device attached\n");
			break;
		case 3:
			DEBUG_PRINTF("    IPL Device status RESERVED!!\n");
			break;
		}
	}
	if (M.x86.R_AX & 0x80) {	// bit 7
		DEBUG_PRINTF
		    ("  Output Device supporting INT 10h Character Output:\n");
		switch (((M.x86.R_AX >> 4) & 0x3)) {	// bits 5:4
		case 0:
			DEBUG_PRINTF("    No Display Device attached\n");
			break;
		case 1:
			DEBUG_PRINTF("    Display Device status unknown\n");
			break;
		case 2:
			DEBUG_PRINTF("    Display Device attached\n");
			break;
		case 3:
			DEBUG_PRINTF("    Display Device status RESERVED!!\n");
			break;
		}
	}
	if (M.x86.R_AX & 0x40) {	// bit 6
		DEBUG_PRINTF
		    ("  Input Device supporting INT 9h Character Input:\n");
		switch (((M.x86.R_AX >> 4) & 0x3)) {	// bits 5:4
		case 0:
			DEBUG_PRINTF("    No Input Device attached\n");
			break;
		case 1:
			DEBUG_PRINTF("    Input Device status unknown\n");
			break;
		case 2:
			DEBUG_PRINTF("    Input Device attached\n");
			break;
		case 3:
			DEBUG_PRINTF("    Input Device status RESERVED!!\n");
			break;
		}
	}
#endif
	/* Check whether the stack is "clean" i.e. containing the HLT
	 * instruction we pushed before executing and pointing to the original
	 * stack address... indicating that the initialization probably was
	 * successful
	 */
	if ((pop_word() == 0xf4f4) && (M.x86.R_SS == STACK_SEGMENT)
	    && (M.x86.R_SP == STACK_START_OFFSET)) {
		DEBUG_PRINTF("Stack is clean, initialization successfull!\n");
	} else {
		DEBUG_PRINTF
		    ("Stack unclean, initialization probably NOT COMPLETE!!\n");
		DEBUG_PRINTF("SS:SP = %04x:%04x, expected: %04x:%04x\n",
			     M.x86.R_SS, M.x86.R_SP, STACK_SEGMENT,
			     STACK_START_OFFSET);
	}


	// TODO: according to the BIOS Boot Spec initializations may be ended using INT18h and setting
	// the status.
	// We need to implement INT18 accordingly, pseudo code is in specsbbs101.pdf page 30
	// (also for Int19)
	return 0;
}