blob: f54f9308022d6d3ab4f472878ecbd4a1839b7ebb [file] [log] [blame]
Kevin O'Connorf076a3e2008-02-25 22:25:15 -05001// 16bit system callbacks
2//
3// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4// Copyright (C) 2002 MandrakeSoft S.A.
5//
6// This file may be distributed under the terms of the GNU GPLv3 license.
7
8#include "util.h" // irq_restore
9#include "biosvar.h" // CONFIG_BIOS_TABLE
10#include "ioport.h" // inb
11#include "cmos.h" // inb_cmos
12
13#define RET_EUNSUPPORTED 0x86
14
15
16// Use PS2 System Control port A to set A20 enable
17static inline u8
18set_a20(u8 cond)
19{
20 // get current setting first
21 u8 newval, oldval = inb(PORT_A20);
22 if (cond)
23 newval = oldval | 0x02;
24 else
25 newval = oldval & ~0x02;
26 outb(newval, PORT_A20);
27
28 return (newval & 0x02) != 0;
29}
30
31static inline void
32handle_ret(struct bregs *regs, u8 code)
33{
34 regs->ah = code;
35 set_cf(regs, code);
36}
37
38static void
39handle_152400(struct bregs *regs)
40{
41 set_a20(0);
42 handle_ret(regs, 0);
43}
44
45static void
46handle_152401(struct bregs *regs)
47{
48 set_a20(1);
49 handle_ret(regs, 0);
50}
51
52static void
53handle_152402(struct bregs *regs)
54{
55 regs->al = !!(inb(PORT_A20) & 0x20);
56 handle_ret(regs, 0);
57}
58
59static void
60handle_152403(struct bregs *regs)
61{
62 regs->bx = 3;
63 handle_ret(regs, 0);
64}
65
66static void
67handle_1524XX(struct bregs *regs)
68{
69 handle_ret(regs, RET_EUNSUPPORTED);
70}
71
72// removable media eject
73static void
74handle_1552(struct bregs *regs)
75{
76 handle_ret(regs, 0);
77}
78
79// Set Interval requested.
80static void
81handle_158300(struct bregs *regs)
82{
83 if (GET_BDA(rtc_wait_flag) & RWS_WAIT_PENDING) {
84 // Interval already set.
85 DEBUGF("int15: Func 83h, failed, already waiting.\n" );
86 handle_ret(regs, RET_EUNSUPPORTED);
87 }
88 // Interval not already set.
89 SET_BDA(rtc_wait_flag, RWS_WAIT_PENDING); // Set status byte.
90 u32 v = (regs->es << 16) | regs->bx;
91 SET_BDA(ptr_user_wait_complete_flag, v);
92 v = (regs->dx << 16) | regs->cx;
93 SET_BDA(user_wait_timeout, v);
94
95 // Unmask IRQ8 so INT70 will get through.
96 u8 irqDisable = inb(PORT_PIC2_DATA);
97 outb(irqDisable & ~PIC2_IRQ8, PORT_PIC2_DATA);
98 // Turn on the Periodic Interrupt timer
99 u8 bRegister = inb_cmos(CMOS_STATUS_B);
100 outb_cmos(CMOS_STATUS_B, bRegister | CSB_EN_ALARM_IRQ);
101
102 set_cf(regs, 0); // XXX - no set ah?
103}
104
105// Clear interval requested
106static void
107handle_158301(struct bregs *regs)
108{
109 SET_BDA(rtc_wait_flag, 0); // Clear status byte
110 // Turn off the Periodic Interrupt timer
111 u8 bRegister = inb_cmos(CMOS_STATUS_B);
112 outb_cmos(CMOS_STATUS_B, bRegister & ~CSB_EN_ALARM_IRQ);
113 set_cf(regs, 0); // XXX - no set ah?
114}
115
116static void
117handle_1583XX(struct bregs *regs)
118{
119 regs->al--;
120 handle_ret(regs, RET_EUNSUPPORTED);
121}
122
123// Sleep for n microseconds. currently using the
124// refresh request port 0x61 bit4, toggling every 15usec
125static void
126usleep(u32 count)
127{
128 count = count / 15;
129 u8 kbd = inb(PORT_KBD_CTRLB);
130 while (count)
131 if ((inb(PORT_KBD_CTRLB) ^ kbd) & KBD_REFRESH)
132 count--;
133}
134
135// Wait for CX:DX microseconds. currently using the
136// refresh request port 0x61 bit4, toggling every 15usec
137static void
138handle_1586(struct bregs *regs)
139{
140 irq_enable();
141 usleep((regs->cx << 16) | regs->dx);
142 irq_disable();
143}
144
145static void
146handle_1587(struct bregs *regs)
147{
148 // +++ should probably have descriptor checks
149 // +++ should have exception handlers
150
151 // turn off interrupts
152 unsigned long flags = irq_save();
153
154 u8 prev_a20_enable = set_a20(1); // enable A20 line
155
156 // 128K max of transfer on 386+ ???
157 // source == destination ???
158
159 // ES:SI points to descriptor table
160 // offset use initially comments
161 // ==============================================
162 // 00..07 Unused zeros Null descriptor
163 // 08..0f GDT zeros filled in by BIOS
164 // 10..17 source ssssssss source of data
165 // 18..1f dest dddddddd destination of data
166 // 20..27 CS zeros filled in by BIOS
167 // 28..2f SS zeros filled in by BIOS
168
169 //es:si
170 //eeee0
171 //0ssss
172 //-----
173
174// check for access rights of source & dest here
175
176 // Initialize GDT descriptor
177 u16 si = regs->si;
178 u16 base15_00 = (regs->es << 4) + si;
179 u16 base23_16 = regs->es >> 12;
180 if (base15_00 < (regs->es<<4))
181 base23_16++;
182 SET_VAR(ES, *(u16*)(si+0x08+0), 47); // limit 15:00 = 6 * 8bytes/descriptor
183 SET_VAR(ES, *(u16*)(si+0x08+2), base15_00);// base 15:00
184 SET_VAR(ES, *(u8 *)(si+0x08+4), base23_16);// base 23:16
185 SET_VAR(ES, *(u8 *)(si+0x08+5), 0x93); // access
186 SET_VAR(ES, *(u16*)(si+0x08+6), 0x0000); // base 31:24/reserved/limit 19:16
187
188 // Initialize CS descriptor
189 SET_VAR(ES, *(u16*)(si+0x20+0), 0xffff);// limit 15:00 = normal 64K limit
190 SET_VAR(ES, *(u16*)(si+0x20+2), 0x0000);// base 15:00
191 SET_VAR(ES, *(u8 *)(si+0x20+4), 0x000f);// base 23:16
192 SET_VAR(ES, *(u8 *)(si+0x20+5), 0x9b); // access
193 SET_VAR(ES, *(u16*)(si+0x20+6), 0x0000);// base 31:24/reserved/limit 19:16
194
195 // Initialize SS descriptor
196 u16 ss = GET_SEG(SS);
197 base15_00 = ss << 4;
198 base23_16 = ss >> 12;
199 SET_VAR(ES, *(u16*)(si+0x28+0), 0xffff); // limit 15:00 = normal 64K limit
200 SET_VAR(ES, *(u16*)(si+0x28+2), base15_00);// base 15:00
201 SET_VAR(ES, *(u8 *)(si+0x28+4), base23_16);// base 23:16
202 SET_VAR(ES, *(u8 *)(si+0x28+5), 0x93); // access
203 SET_VAR(ES, *(u16*)(si+0x28+6), 0x0000); // base 31:24/reserved/limit 19:16
204
205 asm volatile(
206 // Save registers
207 "pushw %%ds\n"
208 "pushw %%es\n"
209 "pushal\n"
210
211 // Load new descriptor tables
212 "lgdt %%es:(%1)\n"
213 "lidt %%cs:pmode_IDT_info\n"
214
215 // set PE bit in CR0
216 "movl %%cr0, %%eax\n"
217 "orb $0x01, %%al\n"
218 "movl %%eax, %%cr0\n"
219
220 // far jump to flush CPU queue after transition to protected mode
221 "ljmpw $0xf000, $1f\n"
222 "1:\n"
223
224 // GDT points to valid descriptor table, now load DS, ES
225 "movw $0x10, %%ax\n" // 010 000 = 2nd descriptor in table, TI=GDT, RPL=00
226 "movw %%ax, %%ds\n"
227 "movw $0x18, %%ax\n" // 011 000 = 3rd descriptor in table, TI=GDT, RPL=00
228 "movw %%ax, %%es\n"
229
230 // move CX words from DS:SI to ES:DI
231 "xorw %%si, %%si\n"
232 "xorw %%di, %%di\n"
233 "cld\n"
234 "rep movsw\n"
235
236 // reset PG bit in CR0 ???
237 "movl %%cr0, %%eax\n"
238 "andb $0xfe, %%al\n"
239 "movl %%eax, %%cr0\n"
240
241 // far jump to flush CPU queue after transition to real mode
242 "ljmpw $0xf000, $2f\n"
243 "2:\n"
244
245 // restore IDT to normal real-mode defaults
246 "lidt %%cs:rmode_IDT_info\n"
247
248 // restore regisers
249 "popal\n"
250 "popw %%es\n"
251 "popw %%ds\n" : : "c" (regs->cx), "r" (si + 8));
252
253 set_a20(prev_a20_enable);
254
255 irq_restore(flags);
256
257 handle_ret(regs, 0);
258}
259
260// Get the amount of extended memory (above 1M)
261static void
262handle_1588(struct bregs *regs)
263{
264 regs->al = inb_cmos(CMOS_EXTMEM_LOW);
265 regs->ah = inb_cmos(CMOS_EXTMEM_HIGH);
266 // According to Ralf Brown's interrupt the limit should be 15M,
267 // but real machines mostly return max. 63M.
268 if (regs->ax > 0xffc0)
269 regs->ax = 0xffc0;
270 set_cf(regs, 0);
271}
272
273// Device busy interrupt. Called by Int 16h when no key available
274static void
275handle_1590(struct bregs *regs)
276{
277}
278
279// Interrupt complete. Called by Int 16h when key becomes available
280static void
281handle_1591(struct bregs *regs)
282{
283}
284
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500285// keyboard intercept
286static void
287handle_154f(struct bregs *regs)
288{
289 set_cf(regs, 1);
290}
291
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500292static void
293handle_15c0(struct bregs *regs)
294{
295 regs->es = SEG_BIOS;
296 regs->bx = (u16)&BIOS_CONFIG_TABLE;
297}
298
299static void
300handle_15c1(struct bregs *regs)
301{
302 regs->es = GET_BDA(ebda_seg);
303 set_cf(regs, 0);
304}
305
306static void
307handle_15e801(struct bregs *regs)
308{
309 // my real system sets ax and bx to 0
310 // this is confirmed by Ralph Brown list
311 // but syslinux v1.48 is known to behave
312 // strangely if ax is set to 0
313 // regs.u.r16.ax = 0;
314 // regs.u.r16.bx = 0;
315
316 // Get the amount of extended memory (above 1M)
317 regs->cl = inb_cmos(CMOS_EXTMEM_LOW);
318 regs->ch = inb_cmos(CMOS_EXTMEM_HIGH);
319
320 // limit to 15M
321 if (regs->cx > 0x3c00)
322 regs->cx = 0x3c00;
323
324 // Get the amount of extended memory above 16M in 64k blocs
325 regs->dl = inb_cmos(CMOS_EXTMEM2_LOW);
326 regs->dh = inb_cmos(CMOS_EXTMEM2_HIGH);
327
328 // Set configured memory equal to extended memory
329 regs->ax = regs->cx;
330 regs->bx = regs->dx;
331
332 set_cf(regs, 0);
333}
334
335#define ACPI_DATA_SIZE 0x00010000L
336
337static void
338set_e820_range(u16 DI, u32 start, u32 end, u16 type)
339{
340 SET_VAR(ES, *(u16*)(DI+0), start);
341 SET_VAR(ES, *(u16*)(DI+2), start >> 16);
342 SET_VAR(ES, *(u16*)(DI+4), 0x00);
343 SET_VAR(ES, *(u16*)(DI+6), 0x00);
344
345 end -= start;
346 SET_VAR(ES, *(u16*)(DI+8), end);
347 SET_VAR(ES, *(u16*)(DI+10), end >> 16);
348 SET_VAR(ES, *(u16*)(DI+12), 0x0000);
349 SET_VAR(ES, *(u16*)(DI+14), 0x0000);
350
351 SET_VAR(ES, *(u16*)(DI+16), type);
352 SET_VAR(ES, *(u16*)(DI+18), 0x0);
353}
354
355// XXX - should create e820 memory map in post and just copy it here.
356static void
357handle_15e820(struct bregs *regs)
358{
359 if (regs->edx != 0x534D4150) {
360 handle_ret(regs, RET_EUNSUPPORTED);
361 return;
362 }
363
364 u32 extended_memory_size = inb_cmos(CMOS_EXTMEM2_HIGH);
365 extended_memory_size <<= 8;
366 extended_memory_size |= inb_cmos(CMOS_EXTMEM2_LOW);
367 extended_memory_size *= 64;
368 // greater than EFF00000???
369 if (extended_memory_size > 0x3bc000)
370 // everything after this is reserved memory until we get to 0x100000000
371 extended_memory_size = 0x3bc000;
372 extended_memory_size *= 1024;
373 extended_memory_size += (16L * 1024 * 1024);
374
375 if (extended_memory_size <= (16L * 1024 * 1024)) {
376 extended_memory_size = inb_cmos(CMOS_EXTMEM_HIGH);
377 extended_memory_size <<= 8;
378 extended_memory_size |= inb_cmos(CMOS_EXTMEM_LOW);
379 extended_memory_size *= 1024;
380 }
381
382 switch (regs->bx) {
383 case 0:
384 set_e820_range(regs->di, 0x0000000L, 0x0009fc00L, 1);
385 regs->ebx = 1;
386 regs->eax = 0x534D4150;
387 regs->ecx = 0x14;
388 set_cf(regs, 0);
389 break;
390 case 1:
391 set_e820_range(regs->di, 0x0009fc00L, 0x000a0000L, 2);
392 regs->ebx = 2;
393 regs->eax = 0x534D4150;
394 regs->ecx = 0x14;
395 set_cf(regs, 0);
396 break;
397 case 2:
398 set_e820_range(regs->di, 0x000e8000L, 0x00100000L, 2);
399 regs->ebx = 3;
400 regs->eax = 0x534D4150;
401 regs->ecx = 0x14;
402 set_cf(regs, 0);
403 break;
404 case 3:
405 set_e820_range(regs->di, 0x00100000L,
406 extended_memory_size - ACPI_DATA_SIZE, 1);
407 regs->ebx = 4;
408 regs->eax = 0x534D4150;
409 regs->ecx = 0x14;
410 set_cf(regs, 0);
411 break;
412 case 4:
413 set_e820_range(regs->di,
414 extended_memory_size - ACPI_DATA_SIZE,
415 extended_memory_size, 3); // ACPI RAM
416 regs->ebx = 5;
417 regs->eax = 0x534D4150;
418 regs->ecx = 0x14;
419 set_cf(regs, 0);
420 break;
421 case 5:
422 /* 256KB BIOS area at the end of 4 GB */
423 set_e820_range(regs->di, 0xfffc0000L, 0x00000000L, 2);
424 regs->ebx = 0;
425 regs->eax = 0x534D4150;
426 regs->ecx = 0x14;
427 set_cf(regs, 0);
428 break;
429 default: /* AX=E820, DX=534D4150, BX unrecognized */
430 handle_ret(regs, RET_EUNSUPPORTED);
431 }
432}
433
434static void
435handle_15e8XX(struct bregs *regs)
436{
437 regs->al--;
438 handle_ret(regs, RET_EUNSUPPORTED);
439}
440
441static void
442handle_15XX(struct bregs *regs)
443{
444 regs->al--;
445 handle_ret(regs, RET_EUNSUPPORTED);
446}
447
448// INT 15h System Services Entry Point
449void VISIBLE
450handle_15(struct bregs *regs)
451{
452 debug_enter(regs);
453 switch (regs->ah) {
454 case 0x24:
455 switch (regs->al) {
456 case 0x00: handle_152400(regs); break;
457 case 0x01: handle_152401(regs); break;
458 case 0x02: handle_152402(regs); break;
459 case 0x03: handle_152403(regs); break;
460 default: handle_1524XX(regs); break;
461 }
462 break;
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500463 case 0x4f: handle_154f(regs); break;
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500464 case 0x52: handle_1552(regs); break;
465 case 0x83:
466 switch (regs->al) {
467 case 0x00: handle_158300(regs); break;
468 case 0x01: handle_158301(regs); break;
469 default: handle_1583XX(regs); break;
470 }
471 break;
472 case 0x86: handle_1586(regs); break;
473 case 0x87: handle_1587(regs); break;
474 case 0x88: handle_1588(regs); break;
475 case 0x90: handle_1590(regs); break;
476 case 0x91: handle_1591(regs); break;
477 case 0xc0: handle_15c0(regs); break;
478 case 0xc1: handle_15c1(regs); break;
479 case 0xc2: handle_15c2(regs); break;
480 case 0xe8:
481 switch (regs->al) {
482 case 0x01: handle_15e801(regs); break;
483 case 0x20: handle_15e820(regs); break;
484 default: handle_15e8XX(regs); break;
485 }
486 break;
487 default: handle_15XX(regs); break;
488 }
489 debug_exit(regs);
490}
491
492// INT 12h Memory Size Service Entry Point
493void VISIBLE
494handle_12(struct bregs *regs)
495{
496 debug_enter(regs);
497 regs->ax = GET_BDA(mem_size_kb);
498 debug_exit(regs);
499}
500
501// INT 11h Equipment List Service Entry Point
502void VISIBLE
503handle_11(struct bregs *regs)
504{
505 debug_enter(regs);
506 regs->ax = GET_BDA(equipment_list_flags);
507 debug_exit(regs);
508}
509
510// INT 05h Print Screen Service Entry Point
511void VISIBLE
512handle_05(struct bregs *regs)
513{
514 debug_enter(regs);
515}
516
517// INT 10h Video Support Service Entry Point
518void VISIBLE
519handle_10(struct bregs *regs)
520{
521 debug_enter(regs);
522 // dont do anything, since the VGA BIOS handles int10h requests
523}
524
525void VISIBLE
526handle_nmi(struct bregs *regs)
527{
528 debug_enter(regs);
529 // XXX
530}
531
532// INT 75 - IRQ13 - MATH COPROCESSOR EXCEPTION
533void VISIBLE
534handle_75(struct bregs *regs)
535{
536 debug_enter(regs);
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500537
538 // clear irq13
539 outb(0, PORT_MATH_CLEAR);
540 // clear interrupt
541 eoi_both_pics();
542 // legacy nmi call
543 struct bregs br;
544 memset(&br, 0, sizeof(br));
545 call16_int(0x02, &br);
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500546}