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Kevin O'Connorf076a3e2008-02-25 22:25:15 -05001// Rom layout and bios assembler to C interface.
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 "config.h"
9
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -050010
11/****************************************************************
12 * Include of 16bit C code
13 ****************************************************************/
14
Kevin O'Connor74534532008-05-12 18:28:58 -040015 .code16gcc
16.include "out/blob.16.s"
Kevin O'Connorf076a3e2008-02-25 22:25:15 -050017
18
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -050019/****************************************************************
Kevin O'Connor1d019512008-03-11 21:21:47 -040020 * Entry macros
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -050021 ****************************************************************/
22
Kevin O'Connor1d019512008-03-11 21:21:47 -040023 // Call a C function - this does the minimal work necessary to
24 // call into C. It sets up %ds, backs up %es, and backs up
25 // those registers that are call clobbered by the C compiler.
26 .macro ENTRY cfunc
27 cld
Kevin O'Connor18f368e2008-03-31 21:56:04 -040028 pushl %eax // Save registers clobbered by C code
Kevin O'Connor1d019512008-03-11 21:21:47 -040029 pushl %ecx
30 pushl %edx
31 pushw %es
32 pushw %ds
Kevin O'Connor18f368e2008-03-31 21:56:04 -040033 movw %ss, %ax // Move %ss to %ds
Kevin O'Connor1d019512008-03-11 21:21:47 -040034 movw %ax, %ds
Kevin O'Connorb3c28be2008-06-08 13:34:43 -040035 pushl %esp // Backup %esp, then clear high bits
36 movzwl %sp, %esp
Kevin O'Connor1d019512008-03-11 21:21:47 -040037 calll \cfunc
Kevin O'Connorb3c28be2008-06-08 13:34:43 -040038 popl %esp // Restore %esp (including high bits)
Kevin O'Connor18f368e2008-03-31 21:56:04 -040039 popw %ds // Restore registers saved above
Kevin O'Connor1d019512008-03-11 21:21:47 -040040 popw %es
41 popl %edx
42 popl %ecx
43 popl %eax
44 .endm
45
46 // Call a C function with current register list as an
47 // argument. This backs up the registers and sets %eax
48 // to point to the backup. On return, the registers are
49 // restored from the structure.
50 .macro ENTRY_ARG cfunc
51 cld
Kevin O'Connor18f368e2008-03-31 21:56:04 -040052 pushl %eax // Save registers (matches struct bregs)
Kevin O'Connor1d019512008-03-11 21:21:47 -040053 pushl %ecx
54 pushl %edx
55 pushl %ebx
56 pushl %esi
57 pushl %edi
58 pushw %es
59 pushw %ds
Kevin O'Connor18f368e2008-03-31 21:56:04 -040060 movw %ss, %ax // Move %ss to %ds
Kevin O'Connor1d019512008-03-11 21:21:47 -040061 movw %ax, %ds
Kevin O'Connorb3c28be2008-06-08 13:34:43 -040062 movl %esp, %ebx // Backup %esp, then zero high bits
63 movzwl %sp, %esp
64 movl %esp, %eax // First arg is pointer to struct bregs
65 calll \cfunc
66 movl %ebx, %esp // Restore %esp (including high bits)
67 popw %ds // Restore registers (from struct bregs)
68 popw %es
69 popl %edi
70 popl %esi
71 popl %ebx
72 popl %edx
73 popl %ecx
74 popl %eax
75 .endm
76
77 // As above, but don't mangle %esp
78 .macro ENTRY_ARG_ESP cfunc
79 cld
80 pushl %eax // Save registers (matches struct bregs)
81 pushl %ecx
82 pushl %edx
83 pushl %ebx
84 pushl %esi
85 pushl %edi
86 pushw %es
87 pushw %ds
88 movw %ss, %ax // Move %ss to %ds
89 movw %ax, %ds
Kevin O'Connor18f368e2008-03-31 21:56:04 -040090 movl %esp, %eax // First arg is pointer to struct bregs
Kevin O'Connor1d019512008-03-11 21:21:47 -040091 calll \cfunc
Kevin O'Connor18f368e2008-03-31 21:56:04 -040092 popw %ds // Restore registers (from struct bregs)
Kevin O'Connor1d019512008-03-11 21:21:47 -040093 popw %es
94 popl %edi
95 popl %esi
96 popl %ebx
97 popl %edx
98 popl %ecx
99 popl %eax
100 .endm
101
Kevin O'Connorbdce35f2008-02-26 21:33:14 -0500102 // Macro to reset the 16bit stack
103 // Clobbers %ax
104 .macro RESET_STACK
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500105 xorw %ax, %ax
106 movw %ax, %ss
Kevin O'Connor276d4a92008-06-11 22:47:01 -0400107 movl $ BUILD_STACK_ADDR , %esp
Kevin O'Connor44eeaf12008-07-06 10:14:49 -0400108 cld
Kevin O'Connorbdce35f2008-02-26 21:33:14 -0500109 .endm
110
Kevin O'Connor74534532008-05-12 18:28:58 -0400111 // Specify a location in the fixed part of bios area.
112 .macro ORG addr
113 .section .text.fixed.addr
Kevin O'Connor276d4a92008-06-11 22:47:01 -0400114 .org \addr - BUILD_START_FIXED
Kevin O'Connor74534532008-05-12 18:28:58 -0400115 .endm
116
Kevin O'Connor1d019512008-03-11 21:21:47 -0400117
118/****************************************************************
119 * POST handler
120 ****************************************************************/
121
Kevin O'Connor74534532008-05-12 18:28:58 -0400122 ORG 0xe05b
Kevin O'Connorbdce35f2008-02-26 21:33:14 -0500123post16:
Kevin O'Connor50cf4f12008-10-25 23:06:23 -0400124 // enable cache
125 movl %cr0, %eax
126 andl $0x9fffffff, %eax
127 movl %eax, %cr0
128
Kevin O'Connorbdce35f2008-02-26 21:33:14 -0500129 // init the stack pointer
130 RESET_STACK
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500131
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400132 pushl $_code32__start
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500133
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500134 // Fall through to transition32 function below
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500135
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500136
137/****************************************************************
138 * Call trampolines
139 ****************************************************************/
140
141// Place CPU into 32bit mode from 16bit mode.
142// Clobbers: %eax, flags, stack registers, cr0, idt/gdt
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500143transition32:
144 // Disable irqs
145 cli
146
147 // enable a20
148 inb $0x92, %al
149 orb $0x02, %al
150 outb %al, $0x92
151
152 // Set segment descriptors
153 lidt %cs:pmode_IDT_info
154 lgdt %cs:rombios32_gdt_48
155
156 // set PE bit in CR0
157 movl %cr0, %eax
158 orb $0x01, %al
159 movl %eax, %cr0
160
161 // start protected mode code
Kevin O'Connor14927082008-11-08 19:07:49 -0500162 ljmpl $SEG32_MODE32_CS, $(BUILD_BIOS_ADDR + 1f)
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500163
164 .code32
1651:
166 // init data segments
Kevin O'Connor14927082008-11-08 19:07:49 -0500167 movl $SEG32_MODE32_DS, %eax
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500168 movw %ax, %ds
169 movw %ax, %es
170 movw %ax, %ss
171 xorl %eax, %eax
172 movw %ax, %fs
173 movw %ax, %gs
174
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500175 retl
176
177// Call a 16bit function from 32bit mode.
Kevin O'Connorcb6735f2008-03-01 13:39:52 -0500178// %eax = address of struct bregs
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500179// Clobbers: all gp registers, flags, stack registers, cr0, idt/gdt
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400180 .global __call16_from32
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500181__call16_from32:
182 pushl %eax
183
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500184 // restore data segment limits to 0xffff
Kevin O'Connor14927082008-11-08 19:07:49 -0500185 movw $SEG32_MODE16_DS, %ax
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500186 movw %ax, %ds
187 movw %ax, %es
188 movw %ax, %ss
189 movw %ax, %fs
190 movw %ax, %gs
191
Kevin O'Connor1a72e2e2008-11-11 22:03:55 -0500192 // disable a20
193 inb $0x92, %al
194 andb $~0x02, %al
195 outb %al, $0x92
196
197 // Jump to 16bit mode
198 ljmpw $SEG32_MODE16_CS, $1f
199
200 .code16gcc
2011:
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500202 // reset PE bit in CR0
203 movl %cr0, %eax
204 andb $0xfe, %al
205 movl %eax, %cr0
206
207 // far jump to flush CPU queue after transition to real mode
Kevin O'Connore3677b12008-07-04 15:29:23 -0400208 ljmpw $SEG_BIOS, $2f
Kevin O'Connor21e930b2008-03-01 09:49:37 -0500209
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -05002102:
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500211 // restore IDT to normal real-mode defaults
212 lidt %cs:rmode_IDT_info
213
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500214 // Clear segment registers
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500215 xorw %ax, %ax
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500216 movw %ax, %fs
217 movw %ax, %gs
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500218 movw %ax, %es
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500219 movw %ax, %ds
220 movw %ax, %ss // Assume stack is in segment 0
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500221
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500222 popl %eax
Kevin O'Connor18f368e2008-03-31 21:56:04 -0400223
224 // Set __call16 return address to be transition32
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500225 pushl $transition32
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500226
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500227 // Fall through to __call16
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500228
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500229
Kevin O'Connor21e930b2008-03-01 09:49:37 -0500230// Call a 16bit function from 16bit mode with a specified cpu register state
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500231// %eax = address of struct bregs
232// Clobbers: all gp registers, es
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400233 .global __call16
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500234__call16:
235 // Save eax
236 pushl %eax
237
238 // Setup for iretw call
Kevin O'Connore3677b12008-07-04 15:29:23 -0400239 pushw $SEG_BIOS
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500240 pushw $1f // return point
Kevin O'Connor1d019512008-03-11 21:21:47 -0400241 pushw 0x20(%eax) // flags
242 pushl 0x1c(%eax) // CS:IP
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500243
244 // Load calling registers.
245 movl 0x04(%eax), %edi
246 movl 0x08(%eax), %esi
Kevin O'Connor1d019512008-03-11 21:21:47 -0400247 movl 0x0c(%eax), %ebx
248 movl 0x10(%eax), %edx
249 movl 0x14(%eax), %ecx
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500250 movw 0x02(%eax), %es // XXX - should load %ds too
Kevin O'Connor1d019512008-03-11 21:21:47 -0400251 movl 0x18(%eax), %eax
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500252
253 // Invoke call
254 iretw // XXX - just do a lcalll
2551:
256 // Store flags, eax, ecx
257 pushfw
258 pushl %eax
259 movl 0x06(%esp), %eax
Kevin O'Connor1d019512008-03-11 21:21:47 -0400260 movl %ecx, %ss:0x14(%eax) // Save %ecx
Kevin O'Connorcbbb6672008-03-08 13:04:10 -0500261 movw %ss, %cx
262 movw %cx, %ds // Restore %ds == %ss
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500263 popl %ecx
Kevin O'Connor1d019512008-03-11 21:21:47 -0400264 movl %ecx, 0x18(%eax) // Save %eax
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500265 popw %cx
Kevin O'Connor1d019512008-03-11 21:21:47 -0400266 movw %cx, 0x20(%eax) // Save flags
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500267
268 // Store remaining registers
269 movw %es, 0x02(%eax)
270 movl %edi, 0x04(%eax)
271 movl %esi, 0x08(%eax)
Kevin O'Connor1d019512008-03-11 21:21:47 -0400272 movl %ebx, 0x0c(%eax)
273 movl %edx, 0x10(%eax)
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500274
275 // Remove %eax
276 popl %eax
277
Kevin O'Connored128492008-03-11 11:14:59 -0400278 cld
279
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500280 retl
281
Kevin O'Connor18f368e2008-03-31 21:56:04 -0400282
283// APM trampolines
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400284 .global apm16protected_entry
Kevin O'Connor1d019512008-03-11 21:21:47 -0400285apm16protected_entry:
286 pushfw // save flags
287 pushl %eax // dummy
288 ENTRY_ARG handle_1553
Kevin O'Connorb3c28be2008-06-08 13:34:43 -0400289 addw $4, %sp // pop dummy
Kevin O'Connor1d019512008-03-11 21:21:47 -0400290 popfw // restore flags
291 lretw
292
293 .code32
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400294 .global apm32protected_entry
Kevin O'Connor1d019512008-03-11 21:21:47 -0400295apm32protected_entry:
Kevin O'Connor68296e82008-03-13 21:33:26 -0400296 pushfw
297 pushw %cs // Setup for long jump to 16bit mode
298 pushw $1f
Kevin O'Connor0fae9e12008-06-07 14:51:14 -0400299 addw $8, 2(%esp)
Kevin O'Connor68296e82008-03-13 21:33:26 -0400300 ljmpw *(%esp)
301 .code16gcc
3021:
Kevin O'Connorb3c28be2008-06-08 13:34:43 -0400303 ENTRY_ARG_ESP handle_1553
Kevin O'Connor68296e82008-03-13 21:33:26 -0400304
305 movw $2f,(%esp) // Setup for long jump back to 32bit mode
Kevin O'Connor0fae9e12008-06-07 14:51:14 -0400306 subw $8, 2(%esp)
Kevin O'Connor68296e82008-03-13 21:33:26 -0400307 ljmpw *(%esp)
308 .code32
3092:
Kevin O'Connor1d019512008-03-11 21:21:47 -0400310 addl $4, %esp // pop call address
311 popfw
312 lretl
Kevin O'Connoree4f9ff2008-07-05 21:19:10 -0400313
314// 32bit elf entry point
315 .global post32
316post32:
317 cli
318 cld
319 lidtl (BUILD_BIOS_ADDR + pmode_IDT_info)
320 lgdtl (BUILD_BIOS_ADDR + rombios32_gdt_48)
321 movl $BUILD_STACK_ADDR, %esp
Kevin O'Connor14927082008-11-08 19:07:49 -0500322 ljmpl $SEG32_MODE32_CS, $_code32__start
Kevin O'Connoree4f9ff2008-07-05 21:19:10 -0400323
Kevin O'Connor1d019512008-03-11 21:21:47 -0400324 .code16gcc
Kevin O'Connor1d019512008-03-11 21:21:47 -0400325
Kevin O'Connor484270d2008-08-17 10:50:57 -0400326// Shutdown a CPU. We want this in the 0xf000 section to ensure that
327// the code wont be overwritten with something else. (Should
328// something spurious wake up the CPU, we want to be sure that the hlt
329// insn will still be present and will shutdown the CPU.)
330 .global permanent_halt
331permanent_halt:
332 cli
3331: hlt
334 jmp 1b
335
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500336
337/****************************************************************
338 * GDT and IDT tables
339 ****************************************************************/
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500340
341// Protected mode IDT descriptor
342//
343// I just make the limit 0, so the machine will shutdown
344// if an exception occurs during protected mode memory
345// transfers.
346//
347// Set base to f0000 to correspond to beginning of BIOS,
348// in case I actually define an IDT later
349// Set limit to 0
350pmode_IDT_info:
351 .word 0x0000 // limit 15:00
Kevin O'Connorddd4bfd2008-02-28 20:00:20 -0500352 .long 0xf0000 // base 16:47
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500353
354// Real mode IDT descriptor
355//
356// Set to typical real-mode values.
357// base = 000000
358// limit = 03ff
359rmode_IDT_info:
360 .word 0x03ff // limit 15:00
Kevin O'Connorddd4bfd2008-02-28 20:00:20 -0500361 .long 0 // base 16:47
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500362
363rombios32_gdt_48:
364 .word 0x30
365 .word rombios32_gdt
366 .word 0x000f
367
Kevin O'Connor44c631d2008-03-02 11:24:36 -0500368 .balign 8
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500369rombios32_gdt:
370 .word 0, 0, 0, 0
371 .word 0, 0, 0, 0
Kevin O'Connor14927082008-11-08 19:07:49 -0500372 // 32 bit flat code segment (SEG32_MODE32_CS)
Kevin O'Connorcb6735f2008-03-01 13:39:52 -0500373 .word 0xffff, 0, 0x9b00, 0x00cf
Kevin O'Connor14927082008-11-08 19:07:49 -0500374 // 32 bit flat data segment (SEG32_MODE32_DS)
Kevin O'Connorcb6735f2008-03-01 13:39:52 -0500375 .word 0xffff, 0, 0x9300, 0x00cf
Kevin O'Connor14927082008-11-08 19:07:49 -0500376 // 16 bit code segment base=0xf0000 limit=0xffff (SEG32_MODE16_CS)
Kevin O'Connorcb6735f2008-03-01 13:39:52 -0500377 .word 0xffff, 0, 0x9b0f, 0x0000
Kevin O'Connor14927082008-11-08 19:07:49 -0500378 // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS)
Kevin O'Connorcb6735f2008-03-01 13:39:52 -0500379 .word 0xffff, 0, 0x9300, 0x0000
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500380
Kevin O'Connorccaf1c52008-07-06 09:30:47 -0400381// We need a copy of this string in the 0xf000 segment, but we are not
382// actually a PnP BIOS, so make sure it is *not* aligned, so OSes will
383// not see it if they scan.
384 .global pnp_string
385 .balign 2
386 .byte 0
387pnp_string:
388 .ascii "$PnP"
389
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500390
391/****************************************************************
392 * Interrupt entry points
393 ****************************************************************/
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500394
Kevin O'Connored128492008-03-11 11:14:59 -0400395 // Define an entry point for an interrupt (no args passed).
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500396 .macro IRQ_ENTRY num
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400397 .global entry_\num
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500398 entry_\num :
Kevin O'Connor44d65302008-03-08 11:34:46 -0500399 cli // In case something far-calls instead of using "int"
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500400 ENTRY handle_\num
401 iretw
402 .endm
403
Kevin O'Connored128492008-03-11 11:14:59 -0400404 // Define an entry point for an interrupt (can read/modify args).
405 .macro IRQ_ENTRY_ARG num
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400406 .global entry_\num
Kevin O'Connored128492008-03-11 11:14:59 -0400407 entry_\num :
408 cli // In case something far-calls instead of using "int"
409 ENTRY_ARG handle_\num
410 iretw
411 .endm
412
Kevin O'Connor74534532008-05-12 18:28:58 -0400413 ORG 0xe2c3
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500414 IRQ_ENTRY nmi
415
Kevin O'Connored128492008-03-11 11:14:59 -0400416 IRQ_ENTRY_ARG 13
417 IRQ_ENTRY_ARG 12
418 IRQ_ENTRY_ARG 11
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500419 IRQ_ENTRY 76
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500420 IRQ_ENTRY 1c
421 IRQ_ENTRY 70
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500422
Kevin O'Connor74534532008-05-12 18:28:58 -0400423 ORG 0xe3fe
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500424 jmp entry_13
425
Kevin O'Connor74534532008-05-12 18:28:58 -0400426 ORG 0xe401
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500427 // XXX - Fixed Disk Parameter Table
428
Kevin O'Connor74534532008-05-12 18:28:58 -0400429 ORG 0xe6f2
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500430 jmp entry_19
431
Kevin O'Connor74534532008-05-12 18:28:58 -0400432 ORG 0xe6f5
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500433.include "out/cbt.proc.16.s"
434 .text
435
Kevin O'Connor74534532008-05-12 18:28:58 -0400436 ORG 0xe729
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500437 // XXX - Baud Rate Generator Table
438
Kevin O'Connor74534532008-05-12 18:28:58 -0400439 ORG 0xe739
Kevin O'Connored128492008-03-11 11:14:59 -0400440 IRQ_ENTRY_ARG 14
441
Kevin O'Connor18f368e2008-03-31 21:56:04 -0400442 IRQ_ENTRY 74
Kevin O'Connor1d019512008-03-11 21:21:47 -0400443 IRQ_ENTRY 75
444
Kevin O'Connored128492008-03-11 11:14:59 -0400445 // int 18/19 are special - they reset the stack and do not return.
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400446 .global entry_19
Kevin O'Connored128492008-03-11 11:14:59 -0400447entry_19:
448 RESET_STACK
Kevin O'Connor44eeaf12008-07-06 10:14:49 -0400449 pushl $_code32_handle_19
450 jmp transition32
Kevin O'Connored128492008-03-11 11:14:59 -0400451
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400452 .global entry_18
Kevin O'Connored128492008-03-11 11:14:59 -0400453entry_18:
454 RESET_STACK
Kevin O'Connor44eeaf12008-07-06 10:14:49 -0400455 pushl $_code32_handle_18
456 jmp transition32
Kevin O'Connored128492008-03-11 11:14:59 -0400457
458 // IRQ trampolines
459 .macro IRQ_TRAMPOLINE num
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400460 .global irq_trampoline_0x\num
Kevin O'Connored128492008-03-11 11:14:59 -0400461 irq_trampoline_0x\num :
462 int $0x\num
463 lretw
464 .endm
465
466 IRQ_TRAMPOLINE 02
467 IRQ_TRAMPOLINE 10
468 IRQ_TRAMPOLINE 13
469 IRQ_TRAMPOLINE 15
Kevin O'Connore0113c92008-04-05 15:51:12 -0400470 IRQ_TRAMPOLINE 16
Kevin O'Connored128492008-03-11 11:14:59 -0400471 IRQ_TRAMPOLINE 18
472 IRQ_TRAMPOLINE 19
473 IRQ_TRAMPOLINE 1c
474 IRQ_TRAMPOLINE 4a
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500475
Kevin O'Connor74534532008-05-12 18:28:58 -0400476 ORG 0xe82e
Kevin O'Connored128492008-03-11 11:14:59 -0400477 IRQ_ENTRY_ARG 16
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500478
Kevin O'Connorc541e1b2008-06-21 12:24:14 -0400479entry_hwirq:
480 ENTRY handle_hwirq
481
Kevin O'Connor74534532008-05-12 18:28:58 -0400482 ORG 0xe987
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500483 IRQ_ENTRY 09
484
Kevin O'Connor74534532008-05-12 18:28:58 -0400485 ORG 0xec59
Kevin O'Connored128492008-03-11 11:14:59 -0400486 IRQ_ENTRY_ARG 40
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500487
Kevin O'Connor74534532008-05-12 18:28:58 -0400488 ORG 0xef57
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500489 IRQ_ENTRY 0e
490
Kevin O'Connor74534532008-05-12 18:28:58 -0400491 ORG 0xefc7
Kevin O'Connor44c631d2008-03-02 11:24:36 -0500492.include "out/floppy_dbt.proc.16.s"
493 .text
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500494
Kevin O'Connor74534532008-05-12 18:28:58 -0400495 ORG 0xefd2
Kevin O'Connored128492008-03-11 11:14:59 -0400496 IRQ_ENTRY_ARG 17
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500497
Kevin O'Connor74534532008-05-12 18:28:58 -0400498 ORG 0xf045
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500499 // XXX int 10
500 iretw
501
Kevin O'Connor74534532008-05-12 18:28:58 -0400502 ORG 0xf065
Kevin O'Connored128492008-03-11 11:14:59 -0400503 IRQ_ENTRY_ARG 10
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500504
Kevin O'Connor74534532008-05-12 18:28:58 -0400505 ORG 0xf0a4
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500506 // XXX int 1D
507 iretw
508
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400509 .global freespace2_start, freespace2_end
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500510freespace2_start:
511
Kevin O'Connor74534532008-05-12 18:28:58 -0400512 ORG 0xf841
Kevin O'Connor38fcbfe2008-02-25 22:30:47 -0500513freespace2_end:
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500514 jmp entry_12
515
Kevin O'Connor74534532008-05-12 18:28:58 -0400516 ORG 0xf84d
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500517 jmp entry_11
518
Kevin O'Connor74534532008-05-12 18:28:58 -0400519 ORG 0xf859
Kevin O'Connored128492008-03-11 11:14:59 -0400520 IRQ_ENTRY_ARG 15
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500521
Kevin O'Connor74534532008-05-12 18:28:58 -0400522 ORG 0xfa6e
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500523.include "out/font.proc.16.s"
524 .text
525
Kevin O'Connor74534532008-05-12 18:28:58 -0400526 ORG 0xfe6e
Kevin O'Connored128492008-03-11 11:14:59 -0400527 IRQ_ENTRY_ARG 1a
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500528
Kevin O'Connor74534532008-05-12 18:28:58 -0400529 ORG 0xfea5
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500530 IRQ_ENTRY 08
531
Kevin O'Connor74534532008-05-12 18:28:58 -0400532 ORG 0xfef3
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500533 // XXX - Initial Interrupt Vector Offsets Loaded by POST
534
Kevin O'Connor74534532008-05-12 18:28:58 -0400535 ORG 0xff00
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500536 // XXX - BIOS_COPYRIGHT_STRING
537 .ascii "(c) 2002 MandrakeSoft S.A. Written by Kevin Lawton & the Bochs team."
538
Kevin O'Connor74534532008-05-12 18:28:58 -0400539 ORG 0xff53
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400540 .global dummy_iret_handler
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500541dummy_iret_handler:
542 iretw
543
Kevin O'Connor74534532008-05-12 18:28:58 -0400544 ORG 0xff54
Kevin O'Connored128492008-03-11 11:14:59 -0400545 IRQ_ENTRY_ARG 05
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500546
Kevin O'Connor74534532008-05-12 18:28:58 -0400547 ORG 0xfff0 // Power-up Entry Point
Kevin O'Connore3677b12008-07-04 15:29:23 -0400548 ljmpw $SEG_BIOS, $post16
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500549
Kevin O'Connor74534532008-05-12 18:28:58 -0400550 ORG 0xfff5
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500551 // BIOS build date
552 .ascii "06/23/99"
553
Kevin O'Connor74534532008-05-12 18:28:58 -0400554 ORG 0xfffe
Kevin O'Connor44c631d2008-03-02 11:24:36 -0500555 .byte CONFIG_MODEL_ID
Kevin O'Connore3677b12008-07-04 15:29:23 -0400556
Kevin O'Connor2fda7cb2008-07-05 20:41:53 -0400557 .global bios_checksum
Kevin O'Connore3677b12008-07-04 15:29:23 -0400558bios_checksum:
Kevin O'Connorf076a3e2008-02-25 22:25:15 -0500559 .byte 0x00
560
561 .end