Annotation of /trunk/mkinitrd-magellan/isolinux/runkernel.inc
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Revision 1133 -
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Thu Aug 19 09:50:43 2010 UTC (14 years, 1 month ago) by niro
File size: 17162 byte(s)
Thu Aug 19 09:50:43 2010 UTC (14 years, 1 month ago) by niro
File size: 17162 byte(s)
-updated to isolinux-3.86
1 | niro | 532 | ;; ----------------------------------------------------------------------- |
2 | ;; | ||
3 | niro | 1133 | ;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved |
4 | ;; Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin | ||
5 | ;; | ||
6 | niro | 532 | ;; This program is free software; you can redistribute it and/or modify |
7 | ;; it under the terms of the GNU General Public License as published by | ||
8 | ;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, | ||
9 | ;; Boston MA 02111-1307, USA; either version 2 of the License, or | ||
10 | ;; (at your option) any later version; incorporated herein by reference. | ||
11 | ;; | ||
12 | ;; ----------------------------------------------------------------------- | ||
13 | |||
14 | ;; | ||
15 | ;; runkernel.inc | ||
16 | niro | 1133 | ;; |
17 | niro | 532 | ;; Common code for running a Linux kernel |
18 | ;; | ||
19 | |||
20 | ; | ||
21 | ; Hook macros, that may or may not be defined | ||
22 | ; | ||
23 | %ifndef HAVE_UNLOAD_PREP | ||
24 | %macro UNLOAD_PREP 0 | ||
25 | %endmacro | ||
26 | %endif | ||
27 | |||
28 | ; | ||
29 | ; A Linux kernel consists of three parts: boot sector, setup code, and | ||
30 | ; kernel code. The boot sector is never executed when using an external | ||
31 | ; booting utility, but it contains some status bytes that are necessary. | ||
32 | ; | ||
33 | niro | 1133 | ; First check that our kernel is at least 1K, or else it isn't long |
34 | ; enough to have the appropriate headers. | ||
35 | niro | 532 | ; |
36 | ; We used to require the kernel to be 64K or larger, but it has gotten | ||
37 | ; popular to use the Linux kernel format for other things, which may | ||
38 | ; not be so large. | ||
39 | ; | ||
40 | niro | 1133 | ; Additionally, we used to have a test for 8 MB or smaller. Equally |
41 | ; obsolete. | ||
42 | ; | ||
43 | niro | 532 | is_linux_kernel: |
44 | niro | 1133 | push si ; <A> file pointer |
45 | |||
46 | niro | 532 | ; |
47 | ; Now start transferring the kernel | ||
48 | ; | ||
49 | push word real_mode_seg | ||
50 | pop es | ||
51 | |||
52 | ; | ||
53 | ; Start by loading the bootsector/setup code, to see if we need to | ||
54 | ; do something funky. It should fit in the first 32K (loading 64K won't | ||
55 | ; work since we might have funny stuff up near the end of memory). | ||
56 | ; | ||
57 | call abort_check ; Check for abort key | ||
58 | niro | 1133 | mov cx,8000h >> SECTOR_SHIFT ; Half a moby (32K) |
59 | niro | 532 | xor bx,bx |
60 | niro | 1133 | pop si ; <A> file pointer |
61 | niro | 532 | call getfssec |
62 | niro | 1133 | cmp cx,1024 |
63 | jb kernel_corrupt | ||
64 | niro | 532 | cmp word [es:bs_bootsign],0AA55h |
65 | jne kernel_corrupt ; Boot sec signature missing | ||
66 | |||
67 | ; | ||
68 | niro | 1133 | ; Save the file pointer for later... |
69 | niro | 532 | ; |
70 | niro | 1133 | push si ; <A> file pointer |
71 | |||
72 | niro | 532 | ; |
73 | ; Construct the command line (append options have already been copied) | ||
74 | ; | ||
75 | construct_cmdline: | ||
76 | mov di,[CmdLinePtr] | ||
77 | niro | 1133 | mov si,boot_image ; BOOT_IMAGE= |
78 | niro | 532 | mov cx,boot_image_len |
79 | rep movsb | ||
80 | niro | 1133 | mov si,KernelCName ; Unmangled kernel name |
81 | niro | 532 | mov cx,[KernelCNameLen] |
82 | rep movsb | ||
83 | mov al,' ' ; Space | ||
84 | stosb | ||
85 | |||
86 | niro | 1133 | call do_ip_append ; Handle IPAppend |
87 | niro | 532 | |
88 | mov si,[CmdOptPtr] ; Options from user input | ||
89 | call strcpy | ||
90 | |||
91 | ; | ||
92 | ; Scan through the command line for anything that looks like we might be | ||
93 | ; interested in. The original version of this code automatically assumed | ||
94 | ; the first option was BOOT_IMAGE=, but that is no longer certain. | ||
95 | ; | ||
96 | niro | 1133 | parse_cmdline: |
97 | mov di,cmd_line_here | ||
98 | .skipspace: mov al,[es:di] | ||
99 | inc di | ||
100 | .skipspace_loaded: | ||
101 | niro | 532 | and al,al |
102 | jz cmdline_end | ||
103 | cmp al,' ' | ||
104 | niro | 1133 | jbe .skipspace |
105 | dec di | ||
106 | |||
107 | ; ES:DI now points to the beginning of an option | ||
108 | mov si,options_list | ||
109 | .next_opt: | ||
110 | movzx cx,byte [si] | ||
111 | jcxz .skip_opt | ||
112 | push di | ||
113 | inc si | ||
114 | niro | 532 | repe cmpsb |
115 | niro | 1133 | jne .no_match |
116 | niro | 532 | |
117 | niro | 1133 | ; This either needs to have been an option with parameter, |
118 | ; or be followed by EOL/whitespace | ||
119 | mov ax,[es:di-1] ; AL = last chr; AH = following | ||
120 | cmp al,'=' | ||
121 | je .is_match | ||
122 | cmp ah,' ' | ||
123 | ja .no_match | ||
124 | .is_match: | ||
125 | pop ax ; Drop option pointer on stack | ||
126 | call [si] | ||
127 | .skip_opt: | ||
128 | mov al,[es:di] | ||
129 | inc di | ||
130 | niro | 532 | cmp al,' ' |
131 | niro | 1133 | ja .skip_opt |
132 | jmp .skipspace_loaded | ||
133 | .no_match: | ||
134 | pop di | ||
135 | add si,cx ; Skip remaining bytes | ||
136 | inc si ; Skip function pointer | ||
137 | inc si | ||
138 | jmp .next_opt | ||
139 | |||
140 | opt_vga: | ||
141 | mov ax,[es:di-1] | ||
142 | mov bx,-1 | ||
143 | cmp ax,'=n' ; vga=normal | ||
144 | je .vc0 | ||
145 | niro | 532 | dec bx ; bx <- -2 |
146 | niro | 1133 | cmp ax,'=e' ; vga=ext |
147 | je .vc0 | ||
148 | dec bx ; bx <- -3 | ||
149 | cmp ax,'=a' ; vga=ask | ||
150 | je .vc0 | ||
151 | mov bx,0x0f04 ; bx <- 0x0f04 (current mode) | ||
152 | cmp ax,'=c' ; vga=current | ||
153 | je .vc0 | ||
154 | call parseint_esdi ; vga=<number> | ||
155 | jc .skip ; Not an integer | ||
156 | .vc0: mov [es:bs_vidmode],bx ; Set video mode | ||
157 | .skip: | ||
158 | ret | ||
159 | |||
160 | opt_mem: | ||
161 | call parseint_esdi | ||
162 | jc .skip | ||
163 | niro | 532 | %if HIGHMEM_SLOP != 0 |
164 | sub ebx,HIGHMEM_SLOP | ||
165 | %endif | ||
166 | niro | 1133 | mov [MyHighMemSize],ebx |
167 | .skip: | ||
168 | ret | ||
169 | |||
170 | opt_quiet: | ||
171 | mov byte [QuietBoot],QUIET_FLAG | ||
172 | ret | ||
173 | |||
174 | %if IS_PXELINUX | ||
175 | opt_keeppxe: | ||
176 | or byte [KeepPXE],1 ; KeepPXE set by command line | ||
177 | ret | ||
178 | %endif | ||
179 | |||
180 | opt_initrd: | ||
181 | mov ax,di | ||
182 | cmp byte [es:di],' ' | ||
183 | ja .have_initrd | ||
184 | xor ax,ax | ||
185 | .have_initrd: | ||
186 | mov [InitRDPtr],ax | ||
187 | ret | ||
188 | |||
189 | ; | ||
190 | ; After command line parsing... | ||
191 | ; | ||
192 | niro | 532 | cmdline_end: |
193 | niro | 1133 | sub di,cmd_line_here |
194 | mov [CmdLineLen],di ; Length including final null | ||
195 | |||
196 | niro | 532 | ; |
197 | ; Now check if we have a large kernel, which needs to be loaded high | ||
198 | ; | ||
199 | niro | 1133 | prepare_header: |
200 | niro | 532 | mov dword [RamdiskMax], HIGHMEM_MAX ; Default initrd limit |
201 | cmp dword [es:su_header],HEADER_ID ; New setup code ID | ||
202 | niro | 1133 | jne old_kernel ; Old kernel, load low |
203 | mov ax,[es:su_version] | ||
204 | mov [KernelVersion],ax | ||
205 | cmp ax,0200h ; Setup code version 2.0 | ||
206 | jb old_kernel ; Old kernel, load low | ||
207 | cmp ax,0201h ; Version 2.01+? | ||
208 | niro | 532 | jb new_kernel ; If 2.00, skip this step |
209 | niro | 1133 | ; Set up the heap (assuming loading high for now) |
210 | mov word [es:su_heapend],linux_stack-512 | ||
211 | niro | 532 | or byte [es:su_loadflags],80h ; Let the kernel know we care |
212 | niro | 1133 | cmp ax,0203h ; Version 2.03+? |
213 | niro | 532 | jb new_kernel ; Not 2.03+ |
214 | mov eax,[es:su_ramdisk_max] | ||
215 | mov [RamdiskMax],eax ; Set the ramdisk limit | ||
216 | |||
217 | ; | ||
218 | ; We definitely have a new-style kernel. Let the kernel know who we are, | ||
219 | ; and that we are clueful | ||
220 | ; | ||
221 | new_kernel: | ||
222 | mov byte [es:su_loader],my_id ; Show some ID | ||
223 | xor eax,eax | ||
224 | mov [es:su_ramdisklen],eax ; No initrd loaded yet | ||
225 | |||
226 | ; | ||
227 | ; About to load the kernel. This is a modern kernel, so use the boot flags | ||
228 | ; we were provided. | ||
229 | ; | ||
230 | mov al,[es:su_loadflags] | ||
231 | niro | 1133 | or al,[QuietBoot] ; Set QUIET_FLAG if needed |
232 | mov [es:su_loadflags],al | ||
233 | niro | 532 | mov [LoadFlags],al |
234 | niro | 1133 | |
235 | any_kernel: | ||
236 | mov si,loading_msg | ||
237 | call writestr_qchk | ||
238 | mov si,KernelCName ; Print kernel name part of | ||
239 | call writestr_qchk ; "Loading" message | ||
240 | |||
241 | niro | 532 | ; |
242 | ; Load the kernel. We always load it at 100000h even if we're supposed to | ||
243 | ; load it "low"; for a "low" load we copy it down to low memory right before | ||
244 | ; jumping to it. | ||
245 | ; | ||
246 | read_kernel: | ||
247 | niro | 1133 | movzx ax,byte [es:bs_setupsecs] ; Setup sectors |
248 | and ax,ax | ||
249 | jnz .sects_ok | ||
250 | mov al,4 ; 0 = 4 setup sectors | ||
251 | .sects_ok: | ||
252 | inc ax ; Including the boot sector | ||
253 | mov [SetupSecs],ax | ||
254 | niro | 532 | |
255 | niro | 1133 | call dot_pause |
256 | |||
257 | niro | 532 | ; |
258 | ; Move the stuff beyond the setup code to high memory at 100000h | ||
259 | ; | ||
260 | movzx esi,word [SetupSecs] ; Setup sectors | ||
261 | shl si,9 ; Convert to bytes | ||
262 | mov ecx,8000h ; 32K | ||
263 | sub ecx,esi ; Number of bytes to copy | ||
264 | add esi,(real_mode_seg << 4) ; Pointer to source | ||
265 | mov edi,100000h ; Copy to address 100000h | ||
266 | |||
267 | call bcopy ; Transfer to high memory | ||
268 | |||
269 | niro | 1133 | pop si ; <A> File pointer |
270 | and si,si ; EOF already? | ||
271 | jz high_load_done | ||
272 | |||
273 | niro | 532 | ; On exit EDI -> where to load the rest |
274 | |||
275 | niro | 1133 | mov bx,dot_pause |
276 | or eax,-1 ; Load the whole file | ||
277 | mov dx,3 ; Pad to dword | ||
278 | call load_high | ||
279 | niro | 532 | |
280 | high_load_done: | ||
281 | mov [KernelEnd],edi | ||
282 | mov ax,real_mode_seg ; Set to real mode seg | ||
283 | mov es,ax | ||
284 | |||
285 | mov si,dot_msg | ||
286 | niro | 1133 | call writestr_qchk |
287 | niro | 532 | |
288 | ; | ||
289 | niro | 1133 | ; Some older kernels (1.2 era) would have more than 4 setup sectors, but |
290 | ; would not rely on the boot protocol to manage that. These kernels fail | ||
291 | ; if they see protected-mode kernel data after the setup sectors, so | ||
292 | ; clear that memory. | ||
293 | ; | ||
294 | push di | ||
295 | mov di,[SetupSecs] | ||
296 | shl di,9 | ||
297 | xor eax,eax | ||
298 | mov cx,cmd_line_here | ||
299 | sub cx,di | ||
300 | shr cx,2 | ||
301 | rep stosd | ||
302 | pop di | ||
303 | |||
304 | ; | ||
305 | niro | 532 | ; Now see if we have an initial RAMdisk; if so, do requisite computation |
306 | ; We know we have a new kernel; the old_kernel code already will have objected | ||
307 | ; if we tried to load initrd using an old kernel | ||
308 | ; | ||
309 | load_initrd: | ||
310 | niro | 1133 | ; Cap the ramdisk memory range if appropriate |
311 | mov eax,[RamdiskMax] | ||
312 | cmp eax,[MyHighMemSize] | ||
313 | ja .ok | ||
314 | mov [MyHighMemSize],eax | ||
315 | .ok: | ||
316 | xor eax,eax | ||
317 | cmp [InitRDPtr],ax | ||
318 | jz .noinitrd | ||
319 | niro | 532 | call parse_load_initrd |
320 | niro | 1133 | .noinitrd: |
321 | |||
322 | niro | 532 | ; |
323 | ; Abandon hope, ye that enter here! We do no longer permit aborts. | ||
324 | ; | ||
325 | niro | 1133 | call abort_check ; Last chance!! |
326 | niro | 532 | |
327 | mov si,ready_msg | ||
328 | niro | 1133 | call writestr_qchk |
329 | niro | 532 | |
330 | UNLOAD_PREP ; Module-specific hook | ||
331 | |||
332 | ; | ||
333 | ; Now, if we were supposed to load "low", copy the kernel down to 10000h | ||
334 | ; and the real mode stuff to 90000h. We assume that all bzImage kernels are | ||
335 | ; capable of starting their setup from a different address. | ||
336 | ; | ||
337 | mov ax,real_mode_seg | ||
338 | niro | 1133 | mov es,ax |
339 | niro | 532 | mov fs,ax |
340 | |||
341 | ; | ||
342 | niro | 1133 | ; If the default root device is set to FLOPPY (0000h), change to |
343 | ; /dev/fd0 (0200h) | ||
344 | ; | ||
345 | cmp word [es:bs_rootdev],byte 0 | ||
346 | jne root_not_floppy | ||
347 | mov word [es:bs_rootdev],0200h | ||
348 | root_not_floppy: | ||
349 | |||
350 | ; | ||
351 | ; Copy command line. Unfortunately, the old kernel boot protocol requires | ||
352 | niro | 532 | ; the command line to exist in the 9xxxxh range even if the rest of the |
353 | ; setup doesn't. | ||
354 | ; | ||
355 | niro | 1133 | setup_command_line: |
356 | mov dx,[KernelVersion] | ||
357 | niro | 532 | test byte [LoadFlags],LOAD_HIGH |
358 | niro | 1133 | jz .need_high_cmdline |
359 | cmp dx,0202h ; Support new cmdline protocol? | ||
360 | jb .need_high_cmdline | ||
361 | niro | 532 | ; New cmdline protocol |
362 | ; Store 32-bit (flat) pointer to command line | ||
363 | niro | 1133 | ; This is the "high" location, since we have bzImage |
364 | mov dword [fs:su_cmd_line_ptr],(real_mode_seg << 4)+cmd_line_here | ||
365 | mov word [HeapEnd],linux_stack | ||
366 | mov word [fs:su_heapend],linux_stack-512 | ||
367 | jmp .setup_done | ||
368 | niro | 532 | |
369 | niro | 1133 | .need_high_cmdline: |
370 | niro | 532 | ; |
371 | niro | 1133 | ; Copy command line down to fit in high conventional memory |
372 | ; -- this happens if we have a zImage kernel or the protocol | ||
373 | ; is less than 2.02. | ||
374 | niro | 532 | ; |
375 | mov si,cmd_line_here | ||
376 | niro | 1133 | mov di,old_cmd_line_here |
377 | niro | 532 | mov [fs:kern_cmd_magic],word CMD_MAGIC ; Store magic |
378 | mov [fs:kern_cmd_offset],di ; Store pointer | ||
379 | niro | 1133 | mov word [HeapEnd],old_linux_stack |
380 | mov ax,255 ; Max cmdline limit | ||
381 | cmp dx,0201h | ||
382 | jb .adjusted | ||
383 | ; Protocol 2.01+ | ||
384 | mov word [fs:su_heapend],old_linux_stack-512 | ||
385 | jbe .adjusted | ||
386 | ; Protocol 2.02+ | ||
387 | ; Note that the only reason we would end up here is | ||
388 | ; because we have a zImage, so we anticipate the move | ||
389 | ; to 90000h already... | ||
390 | mov dword [fs:su_cmd_line_ptr],0x90000+old_cmd_line_here | ||
391 | mov ax,old_max_cmd_len ; 2.02+ allow a higher limit | ||
392 | .adjusted: | ||
393 | niro | 532 | |
394 | mov cx,[CmdLineLen] | ||
395 | niro | 1133 | cmp cx,ax |
396 | niro | 532 | jna .len_ok |
397 | niro | 1133 | mov cx,ax ; Truncate the command line |
398 | niro | 532 | .len_ok: |
399 | fs rep movsb | ||
400 | niro | 1133 | stosb ; Final null, note AL=0 already |
401 | mov [CmdLineEnd],di | ||
402 | cmp dx,0200h | ||
403 | jb .nomovesize | ||
404 | mov [es:su_movesize],di ; Tell the kernel what to move | ||
405 | .nomovesize: | ||
406 | .setup_done: | ||
407 | niro | 532 | |
408 | niro | 1133 | ; |
409 | ; Time to start setting up move descriptors | ||
410 | ; | ||
411 | setup_move: | ||
412 | mov di,trackbuf | ||
413 | xor cx,cx ; Number of descriptors | ||
414 | |||
415 | mov bx,es ; real_mode_seg | ||
416 | mov fs,bx | ||
417 | push ds ; We need DS == ES == CS here | ||
418 | niro | 532 | pop es |
419 | |||
420 | test byte [LoadFlags],LOAD_HIGH | ||
421 | niro | 1133 | jnz .loading_high |
422 | niro | 532 | |
423 | niro | 1133 | ; Loading low: move real_mode stuff to 90000h, then move the kernel down |
424 | mov eax,90000h | ||
425 | stosd | ||
426 | mov eax,real_mode_seg << 4 | ||
427 | stosd | ||
428 | movzx eax,word [CmdLineEnd] | ||
429 | stosd | ||
430 | inc cx | ||
431 | niro | 532 | |
432 | niro | 1133 | mov eax,10000h ; Target address of low kernel |
433 | stosd | ||
434 | mov eax,100000h ; Where currently loaded | ||
435 | stosd | ||
436 | neg eax | ||
437 | add eax,[KernelEnd] | ||
438 | stosd | ||
439 | inc cx | ||
440 | niro | 532 | |
441 | niro | 1133 | mov bx,9000h ; Revised real mode segment |
442 | niro | 532 | |
443 | niro | 1133 | .loading_high: |
444 | niro | 532 | |
445 | niro | 1133 | cmp word [InitRDPtr],0 ; Did we have an initrd? |
446 | je .no_initrd | ||
447 | |||
448 | mov eax,[fs:su_ramdiskat] | ||
449 | stosd | ||
450 | mov eax,[InitRDStart] | ||
451 | stosd | ||
452 | mov eax,[fs:su_ramdisklen] | ||
453 | stosd | ||
454 | inc cx | ||
455 | |||
456 | .no_initrd: | ||
457 | push dword run_linux_kernel | ||
458 | push cx ; Length of descriptor list | ||
459 | |||
460 | ; BX points to the final real mode segment, and will be loaded | ||
461 | ; into DS. | ||
462 | |||
463 | test byte [QuietBoot],QUIET_FLAG | ||
464 | jz replace_bootstrap | ||
465 | jmp replace_bootstrap_noclearmode | ||
466 | |||
467 | run_linux_kernel: | ||
468 | niro | 532 | ; |
469 | ; Set up segment registers and the Linux real-mode stack | ||
470 | niro | 1133 | ; Note: ds == the real mode segment |
471 | niro | 532 | ; |
472 | cli | ||
473 | niro | 1133 | mov ax,ds |
474 | mov ss,ax | ||
475 | mov sp,strict word linux_stack | ||
476 | ; Point HeapEnd to the immediate of the instruction above | ||
477 | HeapEnd equ $-2 ; Self-modifying code! Fun! | ||
478 | mov es,ax | ||
479 | mov fs,ax | ||
480 | mov gs,ax | ||
481 | |||
482 | niro | 532 | ; |
483 | ; We're done... now RUN THAT KERNEL!!!! | ||
484 | ; Setup segment == real mode segment + 020h; we need to jump to offset | ||
485 | ; zero in the real mode segment. | ||
486 | ; | ||
487 | niro | 1133 | add ax,020h |
488 | push ax | ||
489 | niro | 532 | push word 0h |
490 | retf | ||
491 | |||
492 | ; | ||
493 | ; Load an older kernel. Older kernels always have 4 setup sectors, can't have | ||
494 | ; initrd, and are always loaded low. | ||
495 | ; | ||
496 | old_kernel: | ||
497 | niro | 1133 | xor ax,ax |
498 | cmp word [InitRDPtr],ax ; Old kernel can't have initrd | ||
499 | je .load | ||
500 | niro | 532 | mov si,err_oldkernel |
501 | jmp abort_load | ||
502 | niro | 1133 | .load: |
503 | mov byte [LoadFlags],al ; Always low | ||
504 | mov word [KernelVersion],ax ; Version 0.00 | ||
505 | jmp any_kernel | ||
506 | niro | 532 | |
507 | ; | ||
508 | ; parse_load_initrd | ||
509 | ; | ||
510 | niro | 1133 | ; Parse an initrd= option and load the initrds. This sets |
511 | ; InitRDStart and InitRDEnd with dword padding between; we then | ||
512 | ; do a global memory shuffle to move it to the end of memory. | ||
513 | niro | 532 | ; |
514 | niro | 1133 | ; On entry, EDI points to where to start loading. |
515 | ; | ||
516 | niro | 532 | parse_load_initrd: |
517 | push es | ||
518 | push ds | ||
519 | mov ax,real_mode_seg | ||
520 | mov ds,ax | ||
521 | push cs | ||
522 | pop es ; DS == real_mode_seg, ES == CS | ||
523 | |||
524 | niro | 1133 | mov [cs:InitRDStart],edi |
525 | mov [cs:InitRDEnd],edi | ||
526 | |||
527 | niro | 532 | mov si,[cs:InitRDPtr] |
528 | niro | 1133 | |
529 | .get_chunk: | ||
530 | ; DS:SI points to the start of a name | ||
531 | |||
532 | mov bx,si | ||
533 | niro | 532 | .find_end: |
534 | lodsb | ||
535 | niro | 1133 | cmp al,',' |
536 | je .got_end | ||
537 | niro | 532 | cmp al,' ' |
538 | niro | 1133 | jbe .got_end |
539 | jmp .find_end | ||
540 | niro | 532 | |
541 | niro | 1133 | .got_end: |
542 | push ax ; Terminating character | ||
543 | push si ; Next filename (if any) | ||
544 | mov byte [si-1],0 ; Zero-terminate | ||
545 | mov si,bx ; Current filename | ||
546 | niro | 532 | |
547 | niro | 1133 | push di |
548 | niro | 532 | mov di,InitRD ; Target buffer for mangled name |
549 | call mangle_name | ||
550 | niro | 1133 | pop di |
551 | niro | 532 | call loadinitrd |
552 | niro | 1133 | |
553 | niro | 532 | pop si |
554 | pop ax | ||
555 | niro | 1133 | mov [si-1],al ; Restore ending byte |
556 | niro | 532 | |
557 | niro | 1133 | cmp al,',' |
558 | je .get_chunk | ||
559 | niro | 532 | |
560 | niro | 1133 | ; Compute the initrd target location |
561 | ; Note: we round to a page boundary twice here. The first | ||
562 | ; time it is to make sure we don't use any fractional page | ||
563 | ; which may be valid RAM but which will be ignored by the | ||
564 | ; kernel (and therefore is inaccessible.) The second time | ||
565 | ; it is to make sure we start out on page boundary. | ||
566 | mov edx,[cs:InitRDEnd] | ||
567 | sub edx,[cs:InitRDStart] | ||
568 | mov [su_ramdisklen],edx | ||
569 | mov eax,[cs:MyHighMemSize] | ||
570 | and ax,0F000h ; Round to a page boundary | ||
571 | sub eax,edx | ||
572 | and ax,0F000h ; Round to a page boundary | ||
573 | mov [su_ramdiskat],eax | ||
574 | |||
575 | niro | 532 | pop ds |
576 | pop es | ||
577 | ret | ||
578 | |||
579 | ; | ||
580 | ; Load RAM disk into high memory | ||
581 | ; | ||
582 | ; Input: InitRD - set to the mangled name of the initrd | ||
583 | niro | 1133 | ; EDI - location to load |
584 | ; Output: EDI - location for next initrd | ||
585 | ; InitRDEnd - updated | ||
586 | niro | 532 | ; |
587 | loadinitrd: | ||
588 | push ds | ||
589 | push es | ||
590 | mov ax,cs ; CS == DS == ES | ||
591 | mov ds,ax | ||
592 | mov es,ax | ||
593 | niro | 1133 | push edi |
594 | niro | 532 | mov si,InitRD |
595 | mov di,InitRDCName | ||
596 | call unmangle_name ; Create human-readable name | ||
597 | sub di,InitRDCName | ||
598 | mov [InitRDCNameLen],di | ||
599 | mov di,InitRD | ||
600 | call searchdir ; Look for it in directory | ||
601 | niro | 1133 | pop edi |
602 | niro | 532 | jz .notthere |
603 | |||
604 | push si | ||
605 | mov si,crlfloading_msg ; Write "Loading " | ||
606 | niro | 1133 | call writestr_qchk |
607 | niro | 532 | mov si,InitRDCName ; Write ramdisk name |
608 | niro | 1133 | call writestr_qchk |
609 | niro | 532 | mov si,dotdot_msg ; Write dots |
610 | niro | 1133 | call writestr_qchk |
611 | niro | 532 | pop si |
612 | |||
613 | niro | 1133 | .li_skip_echo: |
614 | mov dx,3 | ||
615 | mov bx,dot_pause | ||
616 | call load_high | ||
617 | mov [InitRDEnd],ebx | ||
618 | niro | 532 | |
619 | pop es | ||
620 | pop ds | ||
621 | niro | 1133 | ret |
622 | niro | 532 | |
623 | .notthere: | ||
624 | mov si,err_noinitrd | ||
625 | niro | 1133 | call writestr |
626 | niro | 532 | mov si,InitRDCName |
627 | niro | 1133 | call writestr |
628 | niro | 532 | mov si,crlf_msg |
629 | jmp abort_load | ||
630 | |||
631 | niro | 1133 | ; |
632 | ; writestr_qchk: writestr, except allows output to be suppressed | ||
633 | ; assumes CS == DS | ||
634 | ; | ||
635 | writestr_qchk: | ||
636 | test byte [QuietBoot],QUIET_FLAG | ||
637 | jz writestr | ||
638 | ret | ||
639 | niro | 532 | |
640 | niro | 1133 | section .data |
641 | crlfloading_msg db CR, LF | ||
642 | loading_msg db 'Loading ', 0 | ||
643 | dotdot_msg db '.' | ||
644 | dot_msg db '.', 0 | ||
645 | ready_msg db 'ready.', CR, LF, 0 | ||
646 | err_oldkernel db 'Cannot load a ramdisk with an old kernel image.' | ||
647 | db CR, LF, 0 | ||
648 | err_noinitrd db CR, LF, 'Could not find ramdisk image: ', 0 | ||
649 | niro | 532 | |
650 | boot_image db 'BOOT_IMAGE=' | ||
651 | boot_image_len equ $-boot_image | ||
652 | |||
653 | niro | 1133 | ; |
654 | ; Command line options we'd like to take a look at | ||
655 | ; | ||
656 | %macro cmd_opt 2 | ||
657 | %strlen cmd_opt_len %1 | ||
658 | db cmd_opt_len | ||
659 | db %1 | ||
660 | dw %2 | ||
661 | %endmacro | ||
662 | options_list: | ||
663 | cmd_opt "vga=", opt_vga | ||
664 | cmd_opt "mem=", opt_mem | ||
665 | cmd_opt "quiet", opt_quiet | ||
666 | str_initrd equ $+1 ; Pointer to "initrd=" in memory | ||
667 | cmd_opt "initrd=", opt_initrd | ||
668 | %if IS_PXELINUX | ||
669 | cmd_opt "keeppxe", opt_keeppxe | ||
670 | %endif | ||
671 | db 0 | ||
672 | |||
673 | niro | 532 | section .bss |
674 | alignb 4 | ||
675 | niro | 1133 | MyHighMemSize resd 1 ; Possibly adjusted highmem size |
676 | niro | 532 | RamdiskMax resd 1 ; Highest address for ramdisk |
677 | KernelSize resd 1 ; Size of kernel in bytes | ||
678 | KernelSects resd 1 ; Size of kernel in sectors | ||
679 | KernelEnd resd 1 ; Ending address of the kernel image | ||
680 | niro | 1133 | InitRDStart resd 1 ; Start of initrd (pre-relocation) |
681 | InitRDEnd resd 1 ; End of initrd (pre-relocation) | ||
682 | niro | 532 | CmdLineLen resw 1 ; Length of command line including null |
683 | niro | 1133 | CmdLineEnd resw 1 ; End of the command line in real_mode_seg |
684 | SetupSecs resw 1 ; Number of setup sectors (+bootsect) | ||
685 | KernelVersion resw 1 ; Kernel protocol version | ||
686 | ; | ||
687 | ; These are derived from the command-line parser | ||
688 | ; | ||
689 | niro | 532 | InitRDPtr resw 1 ; Pointer to initrd= option in command line |
690 | LoadFlags resb 1 ; Loadflags from kernel | ||
691 | niro | 1133 | QuietBoot resb 1 ; Set if a quiet boot is requested |