![[bottom]](../icons/bottom.png){kind=icon}
![[previous]](../icons/n_left.png){kind=icon}
![[next]](../icons/n_right.png){kind=icon}
![[first]](../icons/n_first.png){kind=icon}
![[last]](../icons/n_last.png){kind=icon}
![[top]](../icons/n_top.png){kind=icon}
![[index]](../icons/index.png){kind=icon}
![[help]](../icons/help.png){kind=icon}
*/
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
492 /* Cool, here we go. Pick up the romvec pointer in %o0 and stash it in
493 %g7 and at _prom_vector_p. And also quickly check whether we are on
494 a v0 or v2 prom.
495 */
496
497 gokernel: mov %o0, %g7
498 st %o0, [_prom_vector_p] ! we will need it later
499 rd %psr, %l2
500 rd %wim, %l3
501 rd %tbr, %l4
502 or %g0, %o2, %l5 ! could be prom magic value...
503
504 #if 0 /* You think I'm nutz? */
505 cmp %l5, 0x0 ! check for magic SMP pointer
506 bne nosmp
507 nop
508 call %o2 ! call smp prom setup
509 nop
510 #endif /* I will be soon... */
511
512 /* Acquire boot time privileged register values, this will help debugging.
513 * I figure out and store nwindows later on.
514 */
515
516 nosmp: sethi %hi(_boot_psr), %l1
517 st %l2, [%l1 + %lo(_boot_psr)]
518 sethi %hi(_boot_wim), %l1
519 st %l3, [%l1 + %lo(_boot_wim)]
520 sethi %hi(_boot_tbr), %l1
521 st %l4, [%l1 + %lo(_boot_tbr)]
522 sethi %hi(_boot_o_two), %l1
523 st %l5, [%l1 + %lo(_boot_smp_ptr)]
524
525 mov %o0, %g7
526 sethi %hi(_prom_vector_p), %g5
527 st %o0, [%g5 + %lo(_prom_vector_p)] ! we will need it later
528
529 ld [%g7 + 0x4], %o3
530 cmp %o3, 2 ! a v2 prom?
531 be found_v2
532 nop
533
534 /* Old sun4's pass our load address into %o0 instead of the prom
535 pointer. On sun4's you have to hard code the romvec pointer into
536 your code. Sun probably still does that because they don't even
537 trust their own "OpenBoot" specifications.
538 */
539
540 sethi %hi(LOAD_ADDR), %g6
541 cmp %o0, %g6 ! an old sun4?
542 beq no_sun4_here
543 nop
544
545 st %g0, [_prom_iface_vers]
546 b not_v2
547 nop
548
549 found_v2:
550 or %%g0, 0x2, %o5
551 st %o5, [_prom_iface_vers]
552
553 not_v2:
554
555 /* Get the machine type via the mysterious romvec node operations.
556 * Here we can find out whether we are on a sun4 sun4c, sun4m, or
557 * a sun4m. The "nodes" are set up as a bunch of n-ary trees which
558 * you can traverse to get information about devices and such. The
559 * information acquisition happens via the node-ops which are defined
560 * in the linux_openprom.h header file. Of particular interest is the
561 * 'nextnode(int node)' function as it does the smart thing when
562 * presented with a value of '0', it gives you the first node in the
563 * tree. These node integers probably offset into some internal prom
564 * pointer table the openboot has. It's completely undocumented, so
565 * I'm not about to go sifting through the prom address space, but may
566 * do so if I get suspicious enough. :-)
567 */
568
569 or %g0, %g7, %l1
570 add %l1, 0x1c, %l1
571 ld [%l1], %l0
572 ld [%l0], %l0
573 call %l0
574 or %g0, %g0, %o0 ! next_node(0) = first_node
575
576 set _cputypvar, %o1 ! first node has cpu-arch
577 set _cputypval, %o2 ! information, the string
578 ld [%l1], %l0 ! 'compatibility' tells
579 ld [%l0 + 0x0c], %l0 ! that we want 'sun4x' where
580 call %l0 ! x is one of '', 'c', 'm',
581 nop ! 'd' or 'e'. %o2 holds pointer
582 ! to a buf where above string
583 ! will get stored by the prom.
584
585 set _cputypval, %o2 ! better safe than sorry
586 ldub [%o2 + 4], %o0
587 cmp %o0, 'c' ! we already know we are not
588 beq is_sun4c ! on a plain sun4 because of
589 nop ! the check for 0x4000 in %o0
590 cmp %o0, 'm' ! at start:
591 beq is_sun4m
592 nop
593 b no_sun4d_here ! god bless the person who
594 nop ! tried to run this on sun4d
595
596 is_sun4m:
597 is_sun4c: ! OK, this is a sun4c, yippie
598 mov %g7, %g6 ! load up the promvec offsets
599 sethi %hi(prom_magic), %g5 ! magic mushroom :>
600 st %g6, [%g5 + %lo(prom_magic)]
601 add %g7, 0x4, %g6
602 sethi %hi(prom_rom_vers), %g5
603 st %g6, [%g5 + %lo(prom_rom_vers)]
604 add %g7, 0x8, %g6
605 sethi %hi(prom_pluginvers), %g5
606 st %g6, [%g5 + %lo(prom_pluginvers)]
607 add %g7, 0xc, %g6
608 sethi %hi(prom_revision), %g5
609 st %g6, [%g5 + %lo(prom_revision)]
610 add %g7, 0x10, %g6
611 sethi %hi(prom_v0mem_desc), %g5
612 st %g6, [%g5 + %lo(prom_v0mem_desc)]
613 add %g7, 0x1c, %g6
614 sethi %hi(prom_nodefuncs), %g5
615 st %g6, [%g5 + %lo(prom_nodefuncs)]
616 add %g7, 0x68, %g6
617 sethi %hi(prom_printf), %g5
618 st %g6, [%g5 + %lo(prom_printf)]
619 add %g7, 0x6c, %g6
620 sethi %hi(prom_abort), %g5
621 st %g6, [%g5 + %lo(prom_abort)]
622 add %g7, 0x74, %g6
623 sethi %hi(prom_halt), %g5
624 st %g6, [%g5 + %lo(prom_halt)]
625 add %g7, 0x78, %g6
626 sethi %hi(prom_sync), %g5
627 st %g6, [%g5 + %lo(prom_sync)]
628 add %g7, 0x7c, %g6
629 sethi %hi(prom_eval), %g5
630 st %g6, [%g5 + %lo(prom_eval)]
631 add %g7, 0x80, %g6
632 sethi %hi(prom_v0bootline), %g6
633 st %g6, [%g5 + %lo(prom_v0bootline)]
634
635
636 /* That was easy, now lets try to print some message on the screen.
637 * We don't have to worry about bad address translations when the prom
638 * addresses our pointers because our pointers are at 0x0-kern_size
639 * as the prom expects.
640 */
641
642 set boot_msg, %o0
643 ld [prom_printf], %o1
644 ld [%o1], %o1
645 call %o1 ! print boot message #1
646 nop
647
648 _newline: set newline, %o0
649 ld [prom_printf], %o1
650 ld [%o1], %o1
651 call %o1
652 nop
653
654 set pstring1, %o0
655 ld [prom_printf], %o2
656 ld [%o2], %o2
657 ld [prom_magic], %o1
658 ld [%o1], %o1
659 call %o2
660
661 set pstring2, %o0
662 ld [prom_printf], %o2
663 ld [%o2], %o2
664 ld [_prom_iface_vers], %o1
665 ld [%o1], %o1
666 call %o2
667
668 b halt_me
669 nop
670
671 no_sun4_here:
672 ld [%g7 + 0x68], %o1
673 set sun4_notsup, %o0
674 call %o1
675 nop
676
677 rest_of_boot:
678 mov PAGESHIFT_SUN4C, %g5
679
680 set AC_CONTEXT, %g1 ! kernel context, safe now
681 ! the only valid context
682 ! until we call paging_init()
683 stba %g0, [%g1] ASI_CONTROL
684
685
686 /* I make the kernel image sit in memory relative to 0x0 with the text
687 * starting at 0x4000. Now it looks like the way memory is set in Linux
688 * on an ix86.
689 */
690
691 /* Uh, oh, interrupt time. This crap is real confusing. What I want to do is
692 * clear all interrupts, map the interrupt enable register which in effect
693 * enables non-maskable interrupts (or NMI's). Actuall we take no interrupts
694 * until we frob with the %tbr (trap base register) which the prom has set
695 * to all its routines which allows some sanity during bootup.
696 */
697
698 #if 0 /* paranoid, need to fix this routine now */
699 sethi %hi(IE_reg_addr), %l0
700 or %l0, %lo(IE_reg_addr), %l0
701 sethi %hi(INT_ENABLE_REG_PHYSADR), %l2
702 or %l2, %lo(INT_ENABLE_REG_PHYSADR), %l2
703 srl %l2, %g5, %l1
704
705 sta %l1, [%l0] ASI_PTE
706 mov INTS_ALL_ENAB, %l1
707 stb %l1, [%l0]
708 #endif /* paranoid, see above */
709
710 /* Aieee, now set PC and nPC, enable traps, give ourselves a stack and it's
711 * show-time!
712 */
713
714 set 1f, %g1
715 jmp %g1
716 nop
717
718 .align 4
719 1: sethi %hi(_cputyp), %o0
720 st %g4, [%o0 + %lo(_cputyp)]
721
722 sethi %hi(_pgshift), %o0
723 st %g5, [%o0 + %lo(_pgshift)]
724
725 mov 1, %o0
726 sll %o0, %g5, %g5
727 sethi %hi(_nbpg), %o0
728 st %g5, [%o0 + %lo(_nbpg)]
729
730 sub %g5, 1, %g5
731 sethi %hi(_pgofset), %o0
732 st %g5, [%o0 + %lo(_pgofset)]
733
734
735 rd %psr, %g3
736 andn %g3, PSR_ET, %g3
737 wr %g3, 0, %psr ! make sure traps are off
738 ! before we play around
739 WRITE_PAUSE ! no guarentees until 3 insns
740
741
742 wr %g0, 0, %wim ! magical invalid window reg
743 WRITE_PAUSE ! see above
744
745
746 /* I keep the timer interrupt on so that BogoMIPS works and the prom
747 * keeps updating it's "jiffies" counter. 100HZ clock on sparcstations.
748 */
749 wr %g0, (PSR_S | PSR_PS | PSR_PIL), %psr
750 WRITE_PAUSE
751
752 wr %g0, 2, %wim ! window 1 invalid
753 WRITE_PAUSE
754 mov 1, %g1
755 sethi %hi(_task + PCB_WIM), %g2
756 st %g1, [%g2 + %lo(_task + PCB_WIM)]
757
758 /* I want a kernel stack NOW! */
759
760 set USRSTACK - C_STACK, %fp
761 set estack0 - C_STACK - 80, %sp
762 rd %psr, %l0
763 wr %l0, PSR_ET, %psr
764 WRITE_PAUSE
765
766
767 /*
768 * Maybe the prom zero's out our BSS section, maybe it doesn't. I certainly
769 * don't know, do you?
770 */
771
772 set _edata, %o0
773 set _end, %o1
774 sub %o1, %o0, %g2
775 sethi %hi(_kernel_bss_len), %g3
776 st %g2, [%g3 + %lo(_kernel_bss_len)]
777 sethi %hi(_trapbase), %g3
778 or %g3, %lo(_trapbase), %g3
779 sethi %hi(_etext), %g4
780 or %g4, %lo(_etext), %g4
781 sub %g4, %g3, %g2
782 sethi %hi(_kernel_text_len), %g3
783 st %g2, [%g3 + %lo(_kernel_text_len)]
784 sethi %hi(_etext), %g4
785 or %g4, %lo(_etext), %g4
786 sethi %hi(_edata), %g3
787 or %g3, %lo(_edata), %g3
788 sub %g3, %g4, %g2
789 sethi %hi(_kernel_data_len), %g3
790 st %g2, [%g3 + %lo(_kernel_data_len)]
791 clr %g1
792
793 1:
794 st %g0, [%o0]
795 add %o0, 0x4, %o0
796 cmp %o0, %o1
797 bl 1b
798 nop
799
800 /* Compute NWINDOWS and stash it away. Now uses %wim trick explained
801 * in the V8 manual. Ok, this method seems to work, sparc is cool...
802 */
803
804 sethi %hi(0xffffffff), %g1
805 rd %wim, %g2 ! save current value
806 or %g1, %lo(0xffffffff), %g1
807 wr %g1, 0x0, %wim
808 rd %wim, %g1 ! get remaining mask
809 wr %g2, 0x0, %wim ! restore old value
810 WRITE_PAUSE
811
812 or %g0, 0x0, %g3
813
814 1: srl %g1, 0x1, %g1 ! shift until highest
815 cmp %g1, 0x0 ! bit set
816 bne 1b
817 add %g3, 0x1, %g3
818 sethi %hi(_nwindows), %g4
819 st %g3, [%g4 + %lo(_nwindows)] ! store final value
820 sub %g3, 0x1, %g3
821 sethi %hi(_nwindowsm1), %g4
822 st %g3, [%g4 + %lo(_nwindowsm1)]
823
824
825 /* Here we go */
826
827 /* start_kernel() wants the command line args at empty_zero_page, copy
828 * the boot command line from the prom data struct here...
829 */
830
831 /* I still haven't gotten this right yet... hack hack hack */
832
833 #if 0
834 sethi %hi(prom_v0bootline), %g6
835 ld [%g6 + %lo(prom_v0bootline)], %g6
836 ld [%g6], %g6
837 ld [%g6], %g6
838 sethi %hi(_empty_zero_page + 2048), %g2
839 ld [%g2 + %lo(_empty_zero_page + 2048)], %g2
840 ld [%g6], %g3 ! argv[0]
841 or %g0, 0x8, %g1 ! argv counter
842 1: ld [%g3], %g4
843 st %g4, [%g2]
844 add %g3, 0x4, %g3
845 cmp %g4, 0
846 bne,a 1b
847 add %g2, 0x4, %g2
848
849 or %g0, %lo(' '), %g4
850 st %g4, [%g2]
851 sub %g1, 0x1, %g1
852 add %g3, 0x4, %g3
853 cmp %g1, 0
854 bne 1b
855 add %g2, 0x4, %g2
856 #endif
857
858 sethi %hi(_prom_vector_p), %g5
859 ld [%g5 + %lo(_prom_vector_p)], %o0
860 call _start_kernel
861 nop
862
863 call halt_me
864 nop
865
866 /* There, happy now adrian? */
867
868 no_sun4d_here:
869 ld [%g7 + 0x68], %o1
870 set sun4d_notsup, %o0
871 call %o1
872 nop
873 b halt_me
874 nop
875
876 halt_me:
877 ld [%g7 + 0x74], %o0
878 call %o0 ! get us out of here...
879 nop ! apparently solaris is better
880
881 .data
882 .align 4
883
884 /*
885 * Fill up the prom vector, note in particular the kind first element,
886 * no joke. I don't need all of them in here as the entire prom vector
887 * gets initialized in c-code so all routines can use it.
888 */
889
890 .globl _prom_vector_p
891
892 _prom_vector_p: .skip 4
893 prom_magic: .skip 4 ! magic mushroom, beware...
894 prom_rom_vers: .skip 4 ! interface version (v0 or v2)
895 prom_pluginvers: .skip 4 ! XXX help help help ???
896 prom_revision: .skip 4 ! PROM revision (ie. 1.4)
897 prom_halt: .skip 4 ! void halt(void) solaris friend
898 prom_eval: .skip 4 ! void eval(int len, char* string)
899 prom_v0bootline: .skip 4 ! boot command line
900 prom_v0mem_desc: .skip 4 ! V0 memory descriptor list ptr.
901 prom_nodefuncs: .skip 4 ! Magical Node functions
902 prom_printf: .skip 4 ! minimal printf()
903
904 /* The prom_abort pointer MUST be mapped in all contexts, because if you
905 * don't then if a user process is running when you press the abort key
906 * sequence, all sorts of bad things can happen
907 */
908
909 prom_abort: .skip 4 ! "L1-A" magic cookie
910 ! must be mapped in ALL contexts
911
912 /* prom_sync is a place where the kernel should place a pointer to a kernel
913 * function that when called will sync all pending information to the drives
914 * and then promptly return. If the kernel gets aborted with 'L1-A' one can
915 * give the 'sync' command to the boot prompt and this magic cookie gets
916 * executed. Nice feature eh?
917 */
918
919 prom_sync: .skip 4 ! hook in prom for "sync" func
920
921 .align 4
922
923 /* We calculate the following at boot time, window fills/spills and trap entry
924 * code uses these to keep track of the register windows.
925 */
926
927 .globl _nwindows
928 .globl _nwindowsm1
929 _nwindows: .skip 4
930 _nwindowsm1: .skip 4
931
932 .align 4
933 /* Boot time priviledged register values, plus magic %o2 value */
934
935 .globl _boot_wim
936 .globl _boot_psr
937 .globl _boot_tbr
938 .globl _boot_o_two
939 _boot_wim: .skip 4
940 _boot_psr: .skip 4
941 _boot_tbr: .skip 4
942 _boot_smp_ptr: .skip 4
943
![[top]](../icons/top.png){kind=icon}
![[bottom]](../icons/n_bottom.png){kind=icon}
*/