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*/
1 /* boot.S: The initial boot code for the Sparc port of Linux.
2
3 Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
4
5 This file has to serve three purposes.
6
7 1) determine the prom-version and cpu/architecture
8 2) print enough useful info before we start to execute
9 c-code that I can possibly begin to debug things
10 3) Hold the vector of trap entry points
11
12 The Sparc offers many challenges to kernel design. Here I will
13 document those I have come across thus far. Upon bootup the boot
14 prom loads your a.out image into memory. This memory the prom has
15 already mapped for you in two places, however as far as I can tell
16 the virtual address cache is not turned on although the MMU is
17 translating things. You get loaded at 0x4000 exactly and you are
18 aliased to 0xf8004000 with the appropriate mmu entries. So, when
19 you link a boot-loadable object you want to do something like:
20
21 ld -e start -Ttext 4000 -o mykernel myobj1.o myobj2.o ....
22
23 to produce a proper image.
24
25 At boot time you are given (as far as I can tell at this time)
26 one key to figure out what machine you are one and what devices
27 are available. The prom when it loads you leaves a pointer to
28 the 'rom vector' in register %o0 right before it jumps to your
29 starting address. This is a pointer to a struct that is full of
30 pointer to functions (ie. printf, halt, reboot), pointers to
31 linked lists (ie. memory mappings), and pointer to empirical
32 constants (ie. stdin and stdout magic cookies + rom version).
33 Starting with this piece of information you can figure out
34 just about anything you want about the machine you are on.
35
36 Although I don't use it now, if you are on a Multiprocessor and
37 therefore a v3 or above prom, register %o2 at boot contains a
38 function pointer you must call before you proceed to invoke the
39 other cpu's on the machine. I have no idea what kind of magic this
40 is, give me time.
41 */
42
43 #include <asm/head.h>
44 #include <asm/version.h>
45 #include <asm/asi.h>
46 #include <asm/contregs.h>
47
48 .data
49
50 /* First thing to go in the data segment is the interrupt stack. */
51
52 .globl _intstack
53 .globl _eintstack
54 _intstack:
55 .skip 4 * PAGESIZE ! 16k = 128 128-byte stack frames
56 _eintstack:
57
58
59
60 /*
61 The following are used with the prom_vector node-ops to figure out
62 the cpu-type
63 */
64
65 .globl _cputyp
66
67 _cputyp:
68 .word 1
69
70 _cputypval:
71 .asciz "sun4c"
72 .ascii " "
73
74 /*
75 * Sun people can't spell worth damn. "compatability" indeed.
76 * At least we *know* we can't spell, and use a spell-checker.
77 */
78
79 /* Uh, actually Linus it is I who cannot spell. Too much murky
80 * Sparc assembly will does this to ya.
81 */
82 _cputypvar:
83 .asciz "compatability"
84
85 _cputypvallen = _cputypvar - _cputypval
86
87 /* This hold the prom-interface-version number for either v0 or v2. */
88
89 .align 4
90 .globl _prom_iface_vers
91
92 _prom_iface_vers: .skip 4
93
94 /* WARNING: evil messages follow */
95
96 .align 4
97
98 sun4_notsup:
99 .asciz "Sparc-Linux: sun4 support not implemented yet\n\n"
100 .align 4
101
102 sun4m_notsup:
103 .asciz "Sparc-Linux: sun4m support does not exist\n\n"
104 .align 4
105
106 sun4d_notsup:
107 .asciz "Sparc-Linux: sun4d support does not exist\n\n"
108 .align 4
109
110 you_lose:
111 .asciz "You lose..... Thanks for playing...\n"
112 .align 4
113
114
115 .globl boot_msg
116
117 /* memory descriptor property strings, v2 = yuk yuk yuk */
118 /* XXX how to figure out vm mapped by prom? May have to scan magic addresses */
119
120 mem_prop_physavail: .asciz "available"
121 mem_prop_phystot: .asciz "reg"
122
123 /* v2_memory descriptor struct kludged here for assembly, if it ain't broke */
124
125 .align 4
126 v2_mem_struct: .skip 0xff
127
128 .align 4
129 v2_printf_physavail: .asciz "Physical Memory Available: 0x%x bytes"
130 v2_printf_phystot: .asciz "Physical Memory: 0x%x bytes"
131
132 /* A place to store property strings returned from the prom 'node' funcs */
133
134 .align 4
135 prop_string_buf: .skip 32
136
137 prop_name: .asciz "name"
138 .align 4
139
140 current_node: .skip 4
141 .align 4
142
143
144 /* nice little boot message */
145
146 boot_msg:
147 .ascii "Booting Sparc-Linux V0.00PRE-ALPHA "
148 .ascii WHO_COMPILED_ME
149 .asciz " \n"
150 .align 4
151
152 .globl boot_msg2
153
154 boot_msg2:
155 .asciz "Booting Sparclinux V0.00 PRE-ALPHA on a (SUN4C)\n\n"
156
157 .align 4
158
159 pstring1:
160 .asciz "Prom Magic Cookie: 0x%x "
161 .align 4
162
163 pstring2:
164 .asciz "Interface Version: v%d\n"
165 .align 4
166
167 pstring3:
168 .asciz "Prom Revision: V%d\n\n"
169 .align 4
170
171 pstring4:
172 .ascii "Total Physical Memory: %d bytes\nVM mapped by Prom: %d bytes\n"
173 .asciz "Available Physical Memory: %d bytes\n"
174 .align 4
175
176
177 newline:
178 .asciz "\n"
179 .align 4
180
181 .text
182
183 .globl _msgbuf
184 msgbufsize = PAGESIZE ! 1 page for msg buffer
185 _msgbuf = PAGESIZE
186
187
188 IE_reg_addr = _msgbuf + msgbufsize ! this page not used; points to IEreg
189
190
191 /* Ok, things start to get interesting. We get linked such that 'start'
192 is the entry symbol. However, it is real low in kernel address space
193 and as such a nifty place to place the trap table. We achieve this goal
194 by just jumping to 'dostart' for the first trap's entry as the sparc
195 never receives the zero trap as it is real special (hw reset).
196
197 Each trap entry point is the size of 4 sparc instructions (or 4 bytes
198 * 4 insns = 16 bytes). There are 128 hardware traps (some undefined
199 or unimplemented) and 128 software traps (sys-calls, etc.).
200
201 One of the instructions must be a branch. More often than not this
202 will be to a trap handler entry point because it is completely
203 impossible to handle any trap in 4 insns. I welcome anyone to
204 challenge this theory. :-)
205
206 On entry into this table the hardware has loaded the program counter
207 at which the trap occurred into register %l1 and the next program
208 counter into %l2, this way we can return from the trap with a simple
209
210 jmp %l1; rett %l2 ! poof...
211
212 after properly servicing the trap. It wouldn't be a bad idea to load
213 some more information into the local regs since we have technically
214 2 or 3 instructions to play with besides the jmp to the 'real' trap
215 handler (one can even go in the delay slot). For now I am going to put
216 the %psr (processor status register) and the trap-type value in %l0
217 and %l3 respectively. Also, for IRQ's I'll put the level in %l4.
218
219 */
220
221 .globl start
222 .globl _trapbase
223 start:
224 _trapbase:
225 b gokernel; WRITE_PAUSE ! we never get trap #0 it is special
226
227 TRAP_ENTRY(0x1, my_trap_handler) /* Instruction Access Exception */
228 TRAP_ENTRY(0x2, my_trap_handler) /* Illegal Instruction */
229 TRAP_ENTRY(0x3, my_trap_handler) /* Privileged Instruction */
230 TRAP_ENTRY(0x4, my_trap_handler) /* Floating Point Disabled */
231 TRAP_ENTRY(0x5, spill_window_entry) /* Window Overflow */
232 TRAP_ENTRY(0x6, fill_window_entry) /* Window Underflow */
233 TRAP_ENTRY(0x7, my_trap_handler) /* Memory Address Not Aligned */
234 TRAP_ENTRY(0x8, my_trap_handler) /* Floating Point Exception */
235 TRAP_ENTRY(0x9, my_trap_handler) /* Data Miss Exception */
236 TRAP_ENTRY(0xa, my_trap_handler) /* Tagged Instruction Overflow */
237 TRAP_ENTRY(0xb, my_trap_handler) /* Watchpoint Detected */
238 TRAP_ENTRY(0xc, my_trap_handler) /* Undefined... */
239 TRAP_ENTRY(0xd, my_trap_handler) /* Undefined... */
240 TRAP_ENTRY(0xe, my_trap_handler) /* Undefined... */
241 TRAP_ENTRY(0xf, my_trap_handler) /* Undefined... */
242 TRAP_ENTRY(0x10, my_trap_handler) /* Undefined... */
243
244 /* Level'd interrupt entry points, see macro defs above */
245
246 TRAP_ENTRY_INTERRUPT_SOFT(1, 0x101) /* Interrupt Level 1 */
247 TRAP_ENTRY_INTERRUPT(2) /* Interrupt Level 2 */
248 TRAP_ENTRY_INTERRUPT(3) /* Interrupt Level 3 */
249 TRAP_ENTRY_INTERRUPT_SOFT(4, 0x104) /* Interrupt Level 4 */
250 TRAP_ENTRY_INTERRUPT(5) /* Interrupt Level 5 */
251 TRAP_ENTRY_INTERRUPT_SOFT(6, 0x106) /* Interrupt Level 6 */
252 TRAP_ENTRY_INTERRUPT(7) /* Interrupt Level 7 */
253 TRAP_ENTRY_INTERRUPT(8) /* Interrupt Level 8 */
254 TRAP_ENTRY_INTERRUPT(9) /* Interrupt Level 9 */
255 TRAP_ENTRY_INTERRUPT(10) /* Interrupt Level 10 */
256 TRAP_ENTRY_INTERRUPT(11) /* Interrupt Level 11 */
257 TRAP_ENTRY_INTERRUPT(12) /* Interrupt Level 12 */
258 TRAP_ENTRY_INTERRUPT(13) /* Interrupt Level 13 */
259 TRAP_ENTRY_INTERRUPT(14) /* Interrupt Level 14 */
260 TRAP_ENTRY_INTERRUPT_NMI(15, linux_trap_nmi) /* Level 15 (nmi) */
261
262 TRAP_ENTRY(0x20, my_trap_handler) /* General Register Access Error */
263 TRAP_ENTRY(0x21, my_trap_handler) /* Instruction Access Error */
264 TRAP_ENTRY(0x22, my_trap_handler) /* Undefined... */
265 TRAP_ENTRY(0x23, my_trap_handler) /* Undefined... */
266 TRAP_ENTRY(0x24, my_trap_handler) /* Co-Processor Disabled */
267 TRAP_ENTRY(0x25, my_trap_handler) /* Unimplemented FLUSH inst. */
268 TRAP_ENTRY(0x26, my_trap_handler) /* Undefined... */
269 TRAP_ENTRY(0x27, my_trap_handler) /* Undefined... */
270 TRAP_ENTRY(0x28, my_trap_handler) /* Co-Processor Exception */
271 TRAP_ENTRY(0x29, my_trap_handler) /* Data Access Error */
272 TRAP_ENTRY(0x2a, my_trap_handler) /* Division by zero, you lose... */
273 TRAP_ENTRY(0x2b, my_trap_handler) /* Data Store Error */
274 TRAP_ENTRY(0x2c, my_trap_handler) /* Data Access MMU-Miss */
275 TRAP_ENTRY(0x2d, my_trap_handler) /* Undefined... */
276 TRAP_ENTRY(0x2e, my_trap_handler) /* Undefined... */
277 TRAP_ENTRY(0x2f, my_trap_handler) /* Undefined... */
278 TRAP_ENTRY(0x30, my_trap_handler) /* Undefined... */
279 TRAP_ENTRY(0x31, my_trap_handler) /* Undefined... */
280 TRAP_ENTRY(0x32, my_trap_handler) /* Undefined... */
281 TRAP_ENTRY(0x33, my_trap_handler) /* Undefined... */
282 TRAP_ENTRY(0x34, my_trap_handler) /* Undefined... */
283 TRAP_ENTRY(0x35, my_trap_handler) /* Undefined... */
284 TRAP_ENTRY(0x36, my_trap_handler) /* Undefined... */
285 TRAP_ENTRY(0x37, my_trap_handler) /* Undefined... */
286 TRAP_ENTRY(0x38, my_trap_handler) /* Undefined... */
287 TRAP_ENTRY(0x39, my_trap_handler) /* Undefined... */
288 TRAP_ENTRY(0x3a, my_trap_handler) /* Undefined... */
289 TRAP_ENTRY(0x3b, my_trap_handler) /* Undefined... */
290 TRAP_ENTRY(0x3c, my_trap_handler) /* Instruction Access MMU-Miss */
291 TRAP_ENTRY(0x3d, my_trap_handler) /* Undefined... */
292 TRAP_ENTRY(0x3e, my_trap_handler) /* Undefined... */
293 TRAP_ENTRY(0x3f, my_trap_handler) /* Undefined... */
294 TRAP_ENTRY(0x40, my_trap_handler) /* Undefined... */
295 TRAP_ENTRY(0x41, my_trap_handler) /* Undefined... */
296 TRAP_ENTRY(0x42, my_trap_handler) /* Undefined... */
297 TRAP_ENTRY(0x43, my_trap_handler) /* Undefined... */
298 TRAP_ENTRY(0x44, my_trap_handler) /* Undefined... */
299 TRAP_ENTRY(0x45, my_trap_handler) /* Undefined... */
300 TRAP_ENTRY(0x46, my_trap_handler) /* Undefined... */
301 TRAP_ENTRY(0x47, my_trap_handler) /* Undefined... */
302 TRAP_ENTRY(0x48, my_trap_handler) /* Undefined... */
303 TRAP_ENTRY(0x49, my_trap_handler) /* Undefined... */
304 TRAP_ENTRY(0x4a, my_trap_handler) /* Undefined... */
305 TRAP_ENTRY(0x4b, my_trap_handler) /* Undefined... */
306 TRAP_ENTRY(0x4c, my_trap_handler) /* Undefined... */
307 TRAP_ENTRY(0x4d, my_trap_handler) /* Undefined... */
308 TRAP_ENTRY(0x4e, my_trap_handler) /* Undefined... */
309 TRAP_ENTRY(0x4f, my_trap_handler) /* Undefined... */
310 TRAP_ENTRY(0x50, my_trap_handler) /* Undefined... */
311 TRAP_ENTRY(0x51, my_trap_handler) /* Undefined... */
312 TRAP_ENTRY(0x52, my_trap_handler) /* Undefined... */
313 TRAP_ENTRY(0x53, my_trap_handler) /* Undefined... */
314 TRAP_ENTRY(0x54, my_trap_handler) /* Undefined... */
315 TRAP_ENTRY(0x55, my_trap_handler) /* Undefined... */
316 TRAP_ENTRY(0x56, my_trap_handler) /* Undefined... */
317 TRAP_ENTRY(0x57, my_trap_handler) /* Undefined... */
318 TRAP_ENTRY(0x58, my_trap_handler) /* Undefined... */
319 TRAP_ENTRY(0x59, my_trap_handler) /* Undefined... */
320 TRAP_ENTRY(0x5a, my_trap_handler) /* Undefined... */
321 TRAP_ENTRY(0x5b, my_trap_handler) /* Undefined... */
322 TRAP_ENTRY(0x5c, my_trap_handler) /* Undefined... */
323 TRAP_ENTRY(0x5d, my_trap_handler) /* Undefined... */
324 TRAP_ENTRY(0x5e, my_trap_handler) /* Undefined... */
325 TRAP_ENTRY(0x5f, my_trap_handler) /* Undefined... */
326 TRAP_ENTRY(0x60, my_trap_handler) /* Impl-Dep Exception */
327 TRAP_ENTRY(0x61, my_trap_handler) /* Impl-Dep Exception */
328 TRAP_ENTRY(0x62, my_trap_handler) /* Impl-Dep Exception */
329 TRAP_ENTRY(0x63, my_trap_handler) /* Impl-Dep Exception */
330 TRAP_ENTRY(0x64, my_trap_handler) /* Impl-Dep Exception */
331 TRAP_ENTRY(0x65, my_trap_handler) /* Impl-Dep Exception */
332 TRAP_ENTRY(0x66, my_trap_handler) /* Impl-Dep Exception */
333 TRAP_ENTRY(0x67, my_trap_handler) /* Impl-Dep Exception */
334 TRAP_ENTRY(0x68, my_trap_handler) /* Impl-Dep Exception */
335 TRAP_ENTRY(0x69, my_trap_handler) /* Impl-Dep Exception */
336 TRAP_ENTRY(0x6a, my_trap_handler) /* Impl-Dep Exception */
337 TRAP_ENTRY(0x6b, my_trap_handler) /* Impl-Dep Exception */
338 TRAP_ENTRY(0x6c, my_trap_handler) /* Impl-Dep Exception */
339 TRAP_ENTRY(0x6d, my_trap_handler) /* Impl-Dep Exception */
340 TRAP_ENTRY(0x6e, my_trap_handler) /* Impl-Dep Exception */
341 TRAP_ENTRY(0x6f, my_trap_handler) /* Impl-Dep Exception */
342 TRAP_ENTRY(0x70, my_trap_handler) /* Impl-Dep Exception */
343 TRAP_ENTRY(0x71, my_trap_handler) /* Impl-Dep Exception */
344 TRAP_ENTRY(0x72, my_trap_handler) /* Impl-Dep Exception */
345 TRAP_ENTRY(0x73, my_trap_handler) /* Impl-Dep Exception */
346 TRAP_ENTRY(0x74, my_trap_handler) /* Impl-Dep Exception */
347 TRAP_ENTRY(0x75, my_trap_handler) /* Impl-Dep Exception */
348 TRAP_ENTRY(0x76, my_trap_handler) /* Impl-Dep Exception */
349 TRAP_ENTRY(0x77, my_trap_handler) /* Impl-Dep Exception */
350 TRAP_ENTRY(0x78, my_trap_handler) /* Impl-Dep Exception */
351 TRAP_ENTRY(0x79, my_trap_handler) /* Impl-Dep Exception */
352 TRAP_ENTRY(0x7a, my_trap_handler) /* Impl-Dep Exception */
353 TRAP_ENTRY(0x7b, my_trap_handler) /* Impl-Dep Exception */
354 TRAP_ENTRY(0x7c, my_trap_handler) /* Impl-Dep Exception */
355 TRAP_ENTRY(0x7d, my_trap_handler) /* Impl-Dep Exception */
356 TRAP_ENTRY(0x7e, my_trap_handler) /* Impl-Dep Exception */
357 TRAP_ENTRY(0x7f, my_trap_handler) /* Impl-Dep Exception */
358 TRAP_ENTRY(0x80, my_trap_handler) /* SunOS System Call */
359 TRAP_ENTRY(0x81, my_trap_handler) /* Software Trap */
360 TRAP_ENTRY(0x82, my_trap_handler) /* Divide by zero trap XXX */
361 TRAP_ENTRY(0x83, my_trap_handler) /* Flush Windows Trap XXX */
362 TRAP_ENTRY(0x84, my_trap_handler) /* Clean Windows Trap XXX */
363 TRAP_ENTRY(0x85, my_trap_handler) /* Software Trap */
364 TRAP_ENTRY(0x86, my_trap_handler) /* Fix Unaligned Access Trap XXX */
365 TRAP_ENTRY(0x87, my_trap_handler) /* Integer Overflow Trap XXX */
366 TRAP_ENTRY(0x88, my_trap_handler) /* Software Trap */
367 TRAP_ENTRY(0x89, my_trap_handler) /* NetBSD System Call */
368 TRAP_ENTRY(0x8a, my_trap_handler) /* Software Trap */
369 TRAP_ENTRY(0x8b, my_trap_handler) /* Software Trap */
370 TRAP_ENTRY(0x8c, my_trap_handler) /* Software Trap */
371 TRAP_ENTRY(0x8d, my_trap_handler) /* Software Trap */
372 TRAP_ENTRY(0x8e, my_trap_handler) /* Software Trap */
373 TRAP_ENTRY(0x8f, my_trap_handler) /* Software Trap */
374 TRAP_ENTRY(0x90, my_trap_handler) /* SparcLinux System Call */
375 TRAP_ENTRY(0x91, my_trap_handler) /* Software Trap */
376 TRAP_ENTRY(0x92, my_trap_handler) /* Software Trap */
377 TRAP_ENTRY(0x93, my_trap_handler) /* Software Trap */
378 TRAP_ENTRY(0x94, my_trap_handler) /* Software Trap */
379 TRAP_ENTRY(0x95, my_trap_handler) /* Software Trap */
380 TRAP_ENTRY(0x96, my_trap_handler) /* Software Trap */
381 TRAP_ENTRY(0x97, my_trap_handler) /* Software Trap */
382 TRAP_ENTRY(0x98, my_trap_handler) /* Software Trap */
383 TRAP_ENTRY(0x99, my_trap_handler) /* Software Trap */
384 TRAP_ENTRY(0x9a, my_trap_handler) /* Software Trap */
385 TRAP_ENTRY(0x9b, my_trap_handler) /* Software Trap */
386 TRAP_ENTRY(0x9c, my_trap_handler) /* Software Trap */
387 TRAP_ENTRY(0x9d, my_trap_handler) /* Software Trap */
388 TRAP_ENTRY(0x9e, my_trap_handler) /* Software Trap */
389 TRAP_ENTRY(0x9f, my_trap_handler) /* Software Trap */
390 TRAP_ENTRY(0xa0, my_trap_handler) /* Software Trap */
391 TRAP_ENTRY(0xa1, my_trap_handler) /* Software Trap */
392 TRAP_ENTRY(0xa2, my_trap_handler) /* Software Trap */
393 TRAP_ENTRY(0xa3, my_trap_handler) /* Software Trap */
394 TRAP_ENTRY(0xa4, my_trap_handler) /* Software Trap */
395 TRAP_ENTRY(0xa5, my_trap_handler) /* Software Trap */
396 TRAP_ENTRY(0xa6, my_trap_handler) /* Software Trap */
397 TRAP_ENTRY(0xa7, my_trap_handler) /* Software Trap */
398 TRAP_ENTRY(0xa8, my_trap_handler) /* Software Trap */
399 TRAP_ENTRY(0xa9, my_trap_handler) /* Software Trap */
400 TRAP_ENTRY(0xaa, my_trap_handler) /* Software Trap */
401 TRAP_ENTRY(0xab, my_trap_handler) /* Software Trap */
402 TRAP_ENTRY(0xac, my_trap_handler) /* Software Trap */
403 TRAP_ENTRY(0xad, my_trap_handler) /* Software Trap */
404 TRAP_ENTRY(0xae, my_trap_handler) /* Software Trap */
405 TRAP_ENTRY(0xaf, my_trap_handler) /* Software Trap */
406 TRAP_ENTRY(0xb0, my_trap_handler) /* Software Trap */
407 TRAP_ENTRY(0xb1, my_trap_handler) /* Software Trap */
408 TRAP_ENTRY(0xb2, my_trap_handler) /* Software Trap */
409 TRAP_ENTRY(0xb3, my_trap_handler) /* Software Trap */
410 TRAP_ENTRY(0xb4, my_trap_handler) /* Software Trap */
411 TRAP_ENTRY(0xb5, my_trap_handler) /* Software Trap */
412 TRAP_ENTRY(0xb6, my_trap_handler) /* Software Trap */
413 TRAP_ENTRY(0xb7, my_trap_handler) /* Software Trap */
414 TRAP_ENTRY(0xb8, my_trap_handler) /* Software Trap */
415 TRAP_ENTRY(0xb9, my_trap_handler) /* Software Trap */
416 TRAP_ENTRY(0xba, my_trap_handler) /* Software Trap */
417 TRAP_ENTRY(0xbb, my_trap_handler) /* Software Trap */
418 TRAP_ENTRY(0xbc, my_trap_handler) /* Software Trap */
419 TRAP_ENTRY(0xbd, my_trap_handler) /* Software Trap */
420 TRAP_ENTRY(0xbe, my_trap_handler) /* Software Trap */
421 TRAP_ENTRY(0xbf, my_trap_handler) /* Software Trap */
422 TRAP_ENTRY(0xc0, my_trap_handler) /* Software Trap */
423 TRAP_ENTRY(0xc1, my_trap_handler) /* Software Trap */
424 TRAP_ENTRY(0xc2, my_trap_handler) /* Software Trap */
425 TRAP_ENTRY(0xc3, my_trap_handler) /* Software Trap */
426 TRAP_ENTRY(0xc4, my_trap_handler) /* Software Trap */
427 TRAP_ENTRY(0xc5, my_trap_handler) /* Software Trap */
428 TRAP_ENTRY(0xc6, my_trap_handler) /* Software Trap */
429 TRAP_ENTRY(0xc7, my_trap_handler) /* Software Trap */
430 TRAP_ENTRY(0xc8, my_trap_handler) /* Software Trap */
431 TRAP_ENTRY(0xc9, my_trap_handler) /* Software Trap */
432 TRAP_ENTRY(0xca, my_trap_handler) /* Software Trap */
433 TRAP_ENTRY(0xcb, my_trap_handler) /* Software Trap */
434 TRAP_ENTRY(0xcc, my_trap_handler) /* Software Trap */
435 TRAP_ENTRY(0xcd, my_trap_handler) /* Software Trap */
436 TRAP_ENTRY(0xce, my_trap_handler) /* Software Trap */
437 TRAP_ENTRY(0xcf, my_trap_handler) /* Software Trap */
438 TRAP_ENTRY(0xd0, my_trap_handler) /* Software Trap */
439 TRAP_ENTRY(0xd1, my_trap_handler) /* Software Trap */
440 TRAP_ENTRY(0xd2, my_trap_handler) /* Software Trap */
441 TRAP_ENTRY(0xd3, my_trap_handler) /* Software Trap */
442 TRAP_ENTRY(0xd4, my_trap_handler) /* Software Trap */
443 TRAP_ENTRY(0xd5, my_trap_handler) /* Software Trap */
444 TRAP_ENTRY(0xd6, my_trap_handler) /* Software Trap */
445 TRAP_ENTRY(0xd7, my_trap_handler) /* Software Trap */
446 TRAP_ENTRY(0xd8, my_trap_handler) /* Software Trap */
447 TRAP_ENTRY(0xd9, my_trap_handler) /* Software Trap */
448 TRAP_ENTRY(0xda, my_trap_handler) /* Software Trap */
449 TRAP_ENTRY(0xdb, my_trap_handler) /* Software Trap */
450 TRAP_ENTRY(0xdc, my_trap_handler) /* Software Trap */
451 TRAP_ENTRY(0xdd, my_trap_handler) /* Software Trap */
452 TRAP_ENTRY(0xde, my_trap_handler) /* Software Trap */
453 TRAP_ENTRY(0xdf, my_trap_handler) /* Software Trap */
454 TRAP_ENTRY(0xe0, my_trap_handler) /* Software Trap */
455 TRAP_ENTRY(0xe1, my_trap_handler) /* Software Trap */
456 TRAP_ENTRY(0xe2, my_trap_handler) /* Software Trap */
457 TRAP_ENTRY(0xe3, my_trap_handler) /* Software Trap */
458 TRAP_ENTRY(0xe4, my_trap_handler) /* Software Trap */
459 TRAP_ENTRY(0xe5, my_trap_handler) /* Software Trap */
460 TRAP_ENTRY(0xe6, my_trap_handler) /* Software Trap */
461 TRAP_ENTRY(0xe7, my_trap_handler) /* Software Trap */
462 TRAP_ENTRY(0xe8, my_trap_handler) /* Software Trap */
463 TRAP_ENTRY(0xe9, my_trap_handler) /* Software Trap */
464 TRAP_ENTRY(0xea, my_trap_handler) /* Software Trap */
465 TRAP_ENTRY(0xeb, my_trap_handler) /* Software Trap */
466 TRAP_ENTRY(0xec, my_trap_handler) /* Software Trap */
467 TRAP_ENTRY(0xed, my_trap_handler) /* Software Trap */
468 TRAP_ENTRY(0xee, my_trap_handler) /* Software Trap */
469 TRAP_ENTRY(0xef, my_trap_handler) /* Software Trap */
470 TRAP_ENTRY(0xf0, my_trap_handler) /* Software Trap */
471 TRAP_ENTRY(0xf1, my_trap_handler) /* Software Trap */
472 TRAP_ENTRY(0xf2, my_trap_handler) /* Software Trap */
473 TRAP_ENTRY(0xf3, my_trap_handler) /* Software Trap */
474 TRAP_ENTRY(0xf4, my_trap_handler) /* Software Trap */
475 TRAP_ENTRY(0xf5, my_trap_handler) /* Software Trap */
476 TRAP_ENTRY(0xf6, my_trap_handler) /* Software Trap */
477 TRAP_ENTRY(0xf7, my_trap_handler) /* Software Trap */
478 TRAP_ENTRY(0xf8, my_trap_handler) /* Software Trap */
479 TRAP_ENTRY(0xf9, my_trap_handler) /* Software Trap */
480 TRAP_ENTRY(0xfa, my_trap_handler) /* Software Trap */
481 TRAP_ENTRY(0xfb, my_trap_handler) /* Software Trap */
482 TRAP_ENTRY(0xfc, my_trap_handler) /* Software Trap */
483 TRAP_ENTRY(0xfd, my_trap_handler) /* Software Trap */
484 TRAP_ENTRY(0xfe, my_trap_handler) /* Software Trap */
485 TRAP_ENTRY(0xff, my_trap_handler) /* Software Trap */
486
487 _msgbufmapped:
488 .word 1
489
490
491 /* The following two things point to window management tables. The first
492 one is used to quickly look up how many user windows there are from
493 trap-land. The second is used in a trap handler to determine if a rett
494 instruction will land us smack inside the invalid window that possibly
495 the trap was called to fix-up.
496 */
497
498 .data
499 .skip 32 ! alignment byte & negative indices
500 lnx_uw: .skip 32 ! u_char uwtab[-31..31];
501 lnx_winmask: .skip 32 ! u_char wmask[0..31];
502
503 .text
504
505
506 /* Cool, here we go. Pick up the romvec pointer in %o0 and stash it in
507 %g7 and at _prom_vector_p. And also quickly check whether we are on
508 a v0 or v2 prom.
509 */
510
511 gokernel: mov %o0, %g7
512 st %o0, [_prom_vector_p] ! we will need it later
513 rd %psr, %l2
514 rd %wim, %l3
515 rd %tbr, %l4
516 or %g0, %o2, %l5 ! could be prom magic value...
517
518 #if 0 /* You think I'm nutz? */
519 cmp %l5, 0x0 ! check for magic SMP pointer
520 bne nosmp
521 nop
522 call %o2 ! call smp prom setup
523 nop
524 #endif /* I will be soon... */
525
526 /* Acquire boot time privileged register values, this will help debugging.
527 * I figure out and store nwindows later on.
528 */
529
530 nosmp: sethi %hi(_boot_psr), %l1
531 st %l2, [%l1 + %lo(_boot_psr)]
532 sethi %hi(_boot_wim), %l1
533 st %l3, [%l1 + %lo(_boot_wim)]
534 sethi %hi(_boot_tbr), %l1
535 st %l4, [%l1 + %lo(_boot_tbr)]
536 sethi %hi(_boot_o_two), %l1
537 st %l5, [%l1 + %lo(_boot_smp_ptr)]
538
539 mov %o0, %g7
540 sethi %hi(_prom_vector_p), %g5
541 st %o0, [%g5 + %lo(_prom_vector_p)] ! we will need it later
542
543 ld [%g7 + 0x4], %o3
544 cmp %o3, 2 ! a v2 prom?
545 be found_v2
546 nop
547
548 /* Old sun4's pass our load address into %o0 instead of the prom
549 pointer. On sun4's you have to hard code the romvec pointer into
550 your code. Sun probably still does that because they don't even
551 trust their own "OpenBoot" specifications.
552 */
553
554 sethi %hi(LOAD_ADDR), %g6
555 cmp %o0, %g6 ! an old sun4?
556 beq no_sun4_here
557 nop
558
559 st %g0, [_prom_iface_vers]
560 b not_v2
561 nop
562
563 found_v2:
564 or %%g0, 0x2, %o5
565 st %o5, [_prom_iface_vers]
566
567 not_v2:
568
569 /* Get the machine type via the mysterious romvec node operations.
570 Here we can find out whether we are on a sun4 sun4c, sun4m, or
571 a sun4m. The "nodes" are set up as a bunch of n-ary trees which
572 you can traverse to get information about devices and such. The
573 information acquisition happens via the node-ops which are defined
574 in the linux_openprom.h header file. Of particular interest is the
575 'nextnode(int node)' function as it does the smart thing when
576 presented with a value of '0', it gives you the first node in the
577 tree. These node integers probably offset into some internal prom
578 pointer table the openboot has. It's completely undocumented, so
579 I'm not about to go sifting through the prom address space, but may
580 do so if I get suspicious enough. :-)
581 */
582
583 or %g0, %g7, %l1
584 add %l1, 0x1c, %l1
585 ld [%l1], %l0
586 ld [%l0], %l0
587 call %l0
588 or %g0, %g0, %o0 ! next_node(0) = first_node
589
590 set _cputypvar, %o1 ! first node has cpu-arch
591 set _cputypval, %o2 ! information, the string
592 ld [%l1], %l0 ! 'compatibility' tells
593 ld [%l0 + 0x0c], %l0 ! that we want 'sun4x' where
594 call %l0 ! x is one of '', 'c', 'm',
595 nop ! 'd' or 'e'. %o2 holds pointer
596 ! to a buf where above string
597 ! will get stored by the prom.
598
599 set _cputypval, %o2 ! better safe than sorry
600 ldub [%o2 + 4], %o0
601 cmp %o0, 'c' ! we already know we are not
602 beq is_sun4c ! on a plain sun4 because of
603 nop ! the check for 0x4000 in %o0
604 cmp %o0, 'm' ! at start:
605 beq is_sun4m
606 nop
607 b no_sun4d_here ! god bless the person who
608 nop ! tried to run this on sun4d
609
610 is_sun4m:
611 is_sun4c: ! OK, this is a sun4c, yippie
612 mov %g7, %g6 ! load up the promvec offsets
613 sethi %hi(prom_magic), %g5 ! magic mushroom :>
614 st %g6, [%g5 + %lo(prom_magic)]
615 add %g7, 0x4, %g6
616 sethi %hi(prom_rom_vers), %g5
617 st %g6, [%g5 + %lo(prom_rom_vers)]
618 add %g7, 0x8, %g6
619 sethi %hi(prom_pluginvers), %g5
620 st %g6, [%g5 + %lo(prom_pluginvers)]
621 add %g7, 0xc, %g6
622 sethi %hi(prom_revision), %g5
623 st %g6, [%g5 + %lo(prom_revision)]
624 add %g7, 0x10, %g6
625 sethi %hi(prom_v0mem_desc), %g5
626 st %g6, [%g5 + %lo(prom_v0mem_desc)]
627 add %g7, 0x1c, %g6
628 sethi %hi(prom_nodefuncs), %g5
629 st %g6, [%g5 + %lo(prom_nodefuncs)]
630 add %g7, 0x68, %g6
631 sethi %hi(prom_printf), %g5
632 st %g6, [%g5 + %lo(prom_printf)]
633 add %g7, 0x6c, %g6
634 sethi %hi(prom_abort), %g5
635 st %g6, [%g5 + %lo(prom_abort)]
636 add %g7, 0x74, %g6
637 sethi %hi(prom_halt), %g5
638 st %g6, [%g5 + %lo(prom_halt)]
639 add %g7, 0x78, %g6
640 sethi %hi(prom_sync), %g5
641 st %g6, [%g5 + %lo(prom_sync)]
642 add %g7, 0x7c, %g6
643 sethi %hi(prom_eval), %g5
644 st %g6, [%g5 + %lo(prom_eval)]
645 add %g7, 0x80, %g6
646 sethi %hi(prom_v0bootline), %g6
647 st %g6, [%g5 + %lo(prom_v0bootline)]
648
649
650 /* That was easy, now lets try to print some message on the screen.
651 We don't have to worry about bad address translations when the prom
652 addresses our pointers because our pointers are at 0x0-kern_size
653 as the prom expects.
654 */
655
656 set boot_msg, %o0
657 ld [prom_printf], %o1
658 ld [%o1], %o1
659 call %o1 ! print boot message #1
660 nop
661
662 _newline: set newline, %o0
663 ld [prom_printf], %o1
664 ld [%o1], %o1
665 call %o1
666 nop
667
668 set pstring1, %o0
669 ld [prom_printf], %o2
670 ld [%o2], %o2
671 ld [prom_magic], %o1
672 ld [%o1], %o1
673 call %o2
674
675 set pstring2, %o0
676 ld [prom_printf], %o2
677 ld [%o2], %o2
678 ld [_prom_iface_vers], %o1
679 ld [%o1], %o1
680 call %o2
681
682 b halt_me
683 nop
684
685 no_sun4_here:
686 ld [%g7 + 0x68], %o1
687 set sun4_notsup, %o0
688 call %o1
689 nop
690
691 rest_of_boot:
692 mov PAGESHIFT_SUN4C, %g5
693
694 set AC_CONTEXT, %g1 ! kernel context, safe now
695 ! the only valid context
696 ! until we call paging_init()
697 stba %g0, [%g1] ASI_CONTROL
698
699
700 /* I make the kernel image sit in memory relative to 0x0 with the text
701 * starting at 0x4000. Now it looks like the way memory is set in Linux
702 * on an ix86.
703 */
704
705 /* Uh, oh, interrupt time. This crap is real confusing. What I want to do is
706 clear all interrupts, map the interrupt enable register which in effect
707 enables non-maskable interrupts (or NMI's). Actuall we take no interrupts
708 until we frob with the %tbr (trap base register) which the prom has set
709 to all its routines which allows some sanity during bootup.
710 */
711
712 #if 0 /* paranoid, need to fix this routine now */
713 sethi %hi(IE_reg_addr), %l0
714 or %l0, %lo(IE_reg_addr), %l0
715 sethi %hi(INT_ENABLE_REG_PHYSADR), %l2
716 or %l2, %lo(INT_ENABLE_REG_PHYSADR), %l2
717 srl %l2, %g5, %l1
718
719 sta %l1, [%l0] ASI_PTE
720 mov INTS_ALL_ENAB, %l1
721 stb %l1, [%l0]
722 #endif /* paranoid, see above */
723
724 /* Aieee, now set PC and nPC, enable traps, give ourselves a stack and it's
725 show-time!
726 */
727
728 set 1f, %g1
729 jmp %g1
730 nop
731
732 .align 4
733 1: sethi %hi(_cputyp), %o0
734 st %g4, [%o0 + %lo(_cputyp)]
735
736 sethi %hi(_pgshift), %o0
737 st %g5, [%o0 + %lo(_pgshift)]
738
739 mov 1, %o0
740 sll %o0, %g5, %g5
741 sethi %hi(_nbpg), %o0
742 st %g5, [%o0 + %lo(_nbpg)]
743
744 sub %g5, 1, %g5
745 sethi %hi(_pgofset), %o0
746 st %g5, [%o0 + %lo(_pgofset)]
747
748
749 rd %psr, %g3
750 andn %g3, PSR_ET, %g3
751 wr %g3, 0, %psr ! make sure traps are off
752 ! before we play around
753 WRITE_PAUSE ! no guarentees until 3 insns
754
755
756 wr %g0, 0, %wim ! magical invalid window reg
757 WRITE_PAUSE ! see above
758
759
760 /* I keep the timer interrupt on so that BogoMIPS works and the prom
761 * keeps updating it's "jiffies" counter. 100HZ clock on sparcstations.
762 */
763 wr %g0, (PSR_S | PSR_PS | PSR_PIL), %psr
764 WRITE_PAUSE
765
766 wr %g0, 2, %wim ! window 1 invalid
767 WRITE_PAUSE
768 mov 1, %g1
769 sethi %hi(_task + PCB_WIM), %g2
770 st %g1, [%g2 + %lo(_task + PCB_WIM)]
771
772 /* I want a kernel stack NOW! */
773
774 set USRSTACK - C_STACK, %fp
775 set estack0 - C_STACK - 80, %sp
776 rd %psr, %l0
777 wr %l0, PSR_ET, %psr
778 WRITE_PAUSE
779
780
781 /*
782 Maybe the prom zero's out our BSS section, maybe it doesn't. I certainly
783 don't know, do you?
784 */
785
786 set _edata, %o0
787 set _end, %o1
788 sub %o1, %o0, %g2
789 sethi %hi(_kernel_bss_len), %g3
790 st %g2, [%g3 + %lo(_kernel_bss_len)]
791 sethi %hi(_trapbase), %g3
792 or %g3, %lo(_trapbase), %g3
793 sethi %hi(_etext), %g4
794 or %g4, %lo(_etext), %g4
795 sub %g4, %g3, %g2
796 sethi %hi(_kernel_text_len), %g3
797 st %g2, [%g3 + %lo(_kernel_text_len)]
798 sethi %hi(_etext), %g4
799 or %g4, %lo(_etext), %g4
800 sethi %hi(_edata), %g3
801 or %g3, %lo(_edata), %g3
802 sub %g3, %g4, %g2
803 sethi %hi(_kernel_data_len), %g3
804 st %g2, [%g3 + %lo(_kernel_data_len)]
805 clr %g1
806
807 1:
808 st %g0, [%o0]
809 add %o0, 0x4, %o0
810 cmp %o0, %o1
811 bl 1b
812 nop
813
814 /* Compute NWINDOWS and stash it away. Now uses %wim trick explained
815 * in the V8 manual. Ok, this method seems to work, sparc is cool...
816 */
817
818 sethi %hi(0xffffffff), %g1
819 rd %wim, %g2 ! save current value
820 or %g1, %lo(0xffffffff), %g1
821 wr %g1, 0x0, %wim
822 rd %wim, %g1 ! get remaining mask
823 wr %g2, 0x0, %wim ! restore old value
824 WRITE_PAUSE
825
826 or %g0, 0x0, %g3
827
828 1: srl %g1, 0x1, %g1 ! shift until highest
829 cmp %g1, 0x0 ! bit set
830 bne 1b
831 add %g3, 0x1, %g3
832 sethi %hi(_nwindows), %g4
833 st %g3, [%g4 + %lo(_nwindows)] ! store final value
834
835
836 /* Here we go */
837
838 /* start_kernel() wants the command line args at empty_zero_page, copy
839 * the boot command line from the prom data struct here...
840 */
841
842 /* I still haven't gotten this right yet... hack hack hack */
843
844 #if 0
845 sethi %hi(prom_v0bootline), %g6
846 ld [%g6 + %lo(prom_v0bootline)], %g6
847 ld [%g6], %g6
848 ld [%g6], %g6
849 sethi %hi(_empty_zero_page + 2048), %g2
850 ld [%g2 + %lo(_empty_zero_page + 2048)], %g2
851 ld [%g6], %g3 ! argv[0]
852 or %g0, 0x8, %g1 ! argv counter
853 1: ld [%g3], %g4
854 st %g4, [%g2]
855 add %g3, 0x4, %g3
856 cmp %g4, 0
857 bne,a 1b
858 add %g2, 0x4, %g2
859
860 or %g0, %lo(' '), %g4
861 st %g4, [%g2]
862 sub %g1, 0x1, %g1
863 add %g3, 0x4, %g3
864 cmp %g1, 0
865 bne 1b
866 add %g2, 0x4, %g2
867 #endif
868
869 sethi %hi(_prom_vector_p), %g5
870 ld [%g5 + %lo(_prom_vector_p)], %o0
871 call _start_kernel
872 nop
873
874 call halt_me
875 nop
876
877 /* There, happy now adrian? */
878
879 no_sun4d_here:
880 ld [%g7 + 0x68], %o1
881 set sun4d_notsup, %o0
882 call %o1
883 nop
884 b halt_me
885 nop
886
887 halt_me:
888 ld [%g7 + 0x74], %o0
889 call %o0 ! get us out of here...
890 nop ! apparently solaris is better
891
892 .data
893 .align 4
894
895 /*
896 Fill up the prom vector, note in particular the kind first element,
897 no joke. I don't need all of them in here as the entire prom vector
898 gets initialized in c-code so all routines can use it.
899 */
900
901 .globl _prom_vector_p
902
903 _prom_vector_p: .skip 4
904 prom_magic: .skip 4 ! magic mushroom, beware...
905 prom_rom_vers: .skip 4 ! interface version (v0 or v2)
906 prom_pluginvers: .skip 4 ! XXX help help help ???
907 prom_revision: .skip 4 ! PROM revision (ie. 1.4)
908 prom_halt: .skip 4 ! void halt(void) solaris friend
909 prom_eval: .skip 4 ! void eval(int len, char* string)
910 prom_v0bootline: .skip 4 ! boot command line
911 prom_v0mem_desc: .skip 4 ! V0 memory descriptor list ptr.
912 prom_nodefuncs: .skip 4 ! Magical Node functions
913 prom_printf: .skip 4 ! minimal printf()
914
915 /* The prom_abort pointer MUST be mapped in all contexts, because if you
916 don't then if a user process is running when you press the abort key
917 sequence, all sorts of bad things can happen
918 */
919
920 prom_abort: .skip 4 ! "L1-A" magic cookie
921 ! must be mapped in ALL contexts
922
923 /* prom_sync is a place where the kernel should place a pointer to a kernel
924 function that when called will sync all pending information to the drives
925 and then promptly return. If the kernel gets aborted with 'L1-A' one can
926 give the 'sync' command to the boot prompt and this magic cookie gets
927 executed. Nice feature eh?
928 */
929
930 prom_sync: .skip 4 ! hook in prom for "sync" func
931
932 .align 4
933
934 /* Boot time priviledged register values, plus magic %o2 value */
935
936 .globl _boot_wim
937 .globl _boot_psr
938 .globl _boot_tbr
939 .globl _boot_o_two
940 _boot_wim: .skip 4
941 _boot_psr: .skip 4
942 _boot_tbr: .skip 4
943 _boot_smp_ptr: .skip 4
944
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![[bottom]](../icons/n_bottom.png){kind=icon}
*/