Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 2 | /* |
1da177e4 LT |
3 | * linux/arch/sparc/kernel/setup.c |
4 | * | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 2000 Anton Blanchard (anton@samba.org) | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/stddef.h> | |
14 | #include <linux/unistd.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/initrd.h> | |
18 | #include <asm/smp.h> | |
19 | #include <linux/user.h> | |
894673ee | 20 | #include <linux/screen_info.h> |
1da177e4 | 21 | #include <linux/delay.h> |
1da177e4 LT |
22 | #include <linux/fs.h> |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/syscalls.h> | |
25 | #include <linux/kdev_t.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/console.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/root_dev.h> | |
a8cbdcea | 33 | #include <linux/cpu.h> |
1eeb66a1 | 34 | #include <linux/kdebug.h> |
7b64db60 | 35 | #include <linux/export.h> |
4efb55e6 | 36 | #include <linux/start_kernel.h> |
1da177e4 | 37 | |
1da177e4 LT |
38 | #include <asm/io.h> |
39 | #include <asm/processor.h> | |
40 | #include <asm/oplib.h> | |
41 | #include <asm/page.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/traps.h> | |
44 | #include <asm/vaddrs.h> | |
1da177e4 LT |
45 | #include <asm/mbus.h> |
46 | #include <asm/idprom.h> | |
1da177e4 LT |
47 | #include <asm/cpudata.h> |
48 | #include <asm/setup.h> | |
d550bbd4 | 49 | #include <asm/cacheflush.h> |
5b8b93c4 | 50 | #include <asm/sections.h> |
1da177e4 | 51 | |
53ae3419 SR |
52 | #include "kernel.h" |
53 | ||
1da177e4 LT |
54 | struct screen_info screen_info = { |
55 | 0, 0, /* orig-x, orig-y */ | |
56 | 0, /* unused */ | |
57 | 0, /* orig-video-page */ | |
58 | 0, /* orig-video-mode */ | |
59 | 128, /* orig-video-cols */ | |
60 | 0,0,0, /* ega_ax, ega_bx, ega_cx */ | |
61 | 54, /* orig-video-lines */ | |
62 | 0, /* orig-video-isVGA */ | |
63 | 16 /* orig-video-points */ | |
64 | }; | |
65 | ||
66 | /* Typing sync at the prom prompt calls the function pointed to by | |
67 | * romvec->pv_synchook which I set to the following function. | |
68 | * This should sync all filesystems and return, for now it just | |
69 | * prints out pretty messages and returns. | |
70 | */ | |
71 | ||
1da177e4 | 72 | /* Pretty sick eh? */ |
c61c65cd | 73 | static void prom_sync_me(void) |
1da177e4 LT |
74 | { |
75 | unsigned long prom_tbr, flags; | |
76 | ||
77 | /* XXX Badly broken. FIX! - Anton */ | |
78 | local_irq_save(flags); | |
79 | __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr)); | |
80 | __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" | |
81 | "nop\n\t" | |
82 | "nop\n\t" | |
83 | "nop\n\t" : : "r" (&trapbase)); | |
84 | ||
1da177e4 | 85 | prom_printf("PROM SYNC COMMAND...\n"); |
9af744d7 | 86 | show_free_areas(0, NULL); |
29f043a2 | 87 | if (!is_idle_task(current)) { |
1da177e4 LT |
88 | local_irq_enable(); |
89 | sys_sync(); | |
90 | local_irq_disable(); | |
91 | } | |
92 | prom_printf("Returning to prom\n"); | |
93 | ||
94 | __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t" | |
95 | "nop\n\t" | |
96 | "nop\n\t" | |
97 | "nop\n\t" : : "r" (prom_tbr)); | |
98 | local_irq_restore(flags); | |
1da177e4 LT |
99 | } |
100 | ||
c61c65cd | 101 | static unsigned int boot_flags __initdata = 0; |
1da177e4 | 102 | #define BOOTME_DEBUG 0x1 |
1da177e4 LT |
103 | |
104 | /* Exported for mm/init.c:paging_init. */ | |
105 | unsigned long cmdline_memory_size __initdata = 0; | |
106 | ||
5fcafb7a DH |
107 | /* which CPU booted us (0xff = not set) */ |
108 | unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */ | |
5fcafb7a | 109 | |
1da177e4 | 110 | static void |
9ef595d8 | 111 | prom_console_write(struct console *con, const char *s, unsigned int n) |
1da177e4 LT |
112 | { |
113 | prom_write(s, n); | |
114 | } | |
115 | ||
7671fa22 SR |
116 | static struct console prom_early_console = { |
117 | .name = "earlyprom", | |
1da177e4 | 118 | .write = prom_console_write, |
7671fa22 | 119 | .flags = CON_PRINTBUFFER | CON_BOOT, |
1da177e4 LT |
120 | .index = -1, |
121 | }; | |
122 | ||
1da177e4 LT |
123 | /* |
124 | * Process kernel command line switches that are specific to the | |
125 | * SPARC or that require special low-level processing. | |
126 | */ | |
127 | static void __init process_switch(char c) | |
128 | { | |
129 | switch (c) { | |
130 | case 'd': | |
131 | boot_flags |= BOOTME_DEBUG; | |
132 | break; | |
133 | case 's': | |
1da177e4 LT |
134 | break; |
135 | case 'h': | |
136 | prom_printf("boot_flags_init: Halt!\n"); | |
137 | prom_halt(); | |
138 | break; | |
139 | case 'p': | |
11032c17 | 140 | prom_early_console.flags &= ~CON_BOOT; |
1da177e4 LT |
141 | break; |
142 | default: | |
143 | printk("Unknown boot switch (-%c)\n", c); | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
1da177e4 LT |
148 | static void __init boot_flags_init(char *commands) |
149 | { | |
150 | while (*commands) { | |
151 | /* Move to the start of the next "argument". */ | |
8c64415c | 152 | while (*commands == ' ') |
1da177e4 LT |
153 | commands++; |
154 | ||
155 | /* Process any command switches, otherwise skip it. */ | |
156 | if (*commands == '\0') | |
157 | break; | |
158 | if (*commands == '-') { | |
159 | commands++; | |
160 | while (*commands && *commands != ' ') | |
161 | process_switch(*commands++); | |
162 | continue; | |
163 | } | |
c73fcc84 | 164 | if (!strncmp(commands, "mem=", 4)) { |
1da177e4 LT |
165 | /* |
166 | * "mem=XXX[kKmM] overrides the PROM-reported | |
167 | * memory size. | |
168 | */ | |
169 | cmdline_memory_size = simple_strtoul(commands + 4, | |
170 | &commands, 0); | |
171 | if (*commands == 'K' || *commands == 'k') { | |
172 | cmdline_memory_size <<= 10; | |
173 | commands++; | |
174 | } else if (*commands=='M' || *commands=='m') { | |
175 | cmdline_memory_size <<= 20; | |
176 | commands++; | |
177 | } | |
178 | } | |
179 | while (*commands && *commands != ' ') | |
180 | commands++; | |
181 | } | |
182 | } | |
183 | ||
1da177e4 LT |
184 | extern unsigned short root_flags; |
185 | extern unsigned short root_dev; | |
186 | extern unsigned short ram_flags; | |
187 | #define RAMDISK_IMAGE_START_MASK 0x07FF | |
188 | #define RAMDISK_PROMPT_FLAG 0x8000 | |
189 | #define RAMDISK_LOAD_FLAG 0x4000 | |
190 | ||
191 | extern int root_mountflags; | |
192 | ||
193 | char reboot_command[COMMAND_LINE_SIZE]; | |
6943f3da | 194 | |
c68e5d39 DM |
195 | struct cpuid_patch_entry { |
196 | unsigned int addr; | |
197 | unsigned int sun4d[3]; | |
198 | unsigned int leon[3]; | |
199 | }; | |
200 | extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end; | |
201 | ||
202 | static void __init per_cpu_patch(void) | |
203 | { | |
204 | struct cpuid_patch_entry *p; | |
205 | ||
206 | if (sparc_cpu_model == sun4m) { | |
207 | /* Nothing to do, this is what the unpatched code | |
208 | * targets. | |
209 | */ | |
210 | return; | |
211 | } | |
212 | ||
213 | p = &__cpuid_patch; | |
214 | while (p < &__cpuid_patch_end) { | |
215 | unsigned long addr = p->addr; | |
216 | unsigned int *insns; | |
217 | ||
218 | switch (sparc_cpu_model) { | |
219 | case sun4d: | |
220 | insns = &p->sun4d[0]; | |
221 | break; | |
222 | ||
223 | case sparc_leon: | |
224 | insns = &p->leon[0]; | |
225 | break; | |
226 | default: | |
227 | prom_printf("Unknown cpu type, halting.\n"); | |
228 | prom_halt(); | |
229 | } | |
230 | *(unsigned int *) (addr + 0) = insns[0]; | |
1edc1783 | 231 | flushi(addr + 0); |
c68e5d39 | 232 | *(unsigned int *) (addr + 4) = insns[1]; |
1edc1783 | 233 | flushi(addr + 4); |
c68e5d39 | 234 | *(unsigned int *) (addr + 8) = insns[2]; |
1edc1783 | 235 | flushi(addr + 8); |
9cd5f822 SR |
236 | |
237 | p++; | |
c68e5d39 | 238 | } |
c68e5d39 DM |
239 | } |
240 | ||
5b8b93c4 SR |
241 | struct leon_1insn_patch_entry { |
242 | unsigned int addr; | |
243 | unsigned int insn; | |
244 | }; | |
245 | ||
1da177e4 | 246 | enum sparc_cpu sparc_cpu_model; |
6943f3da | 247 | EXPORT_SYMBOL(sparc_cpu_model); |
1da177e4 | 248 | |
5b8b93c4 SR |
249 | static __init void leon_patch(void) |
250 | { | |
251 | struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch; | |
252 | struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end; | |
253 | ||
254 | /* Default instruction is leon - no patching */ | |
255 | if (sparc_cpu_model == sparc_leon) | |
256 | return; | |
257 | ||
258 | while (start < end) { | |
259 | unsigned long addr = start->addr; | |
260 | ||
261 | *(unsigned int *)(addr) = start->insn; | |
262 | flushi(addr); | |
263 | ||
264 | start++; | |
265 | } | |
266 | } | |
1da177e4 | 267 | |
5b8b93c4 | 268 | struct tt_entry *sparc_ttable; |
d191723f | 269 | static struct pt_regs fake_swapper_regs; |
1da177e4 | 270 | |
4efb55e6 SR |
271 | /* Called from head_32.S - before we have setup anything |
272 | * in the kernel. Be very careful with what you do here. | |
273 | */ | |
274 | void __init sparc32_start_kernel(struct linux_romvec *rp) | |
275 | { | |
276 | prom_init(rp); | |
5b8b93c4 SR |
277 | |
278 | /* Set sparc_cpu_model */ | |
279 | sparc_cpu_model = sun_unknown; | |
280 | if (!strcmp(&cputypval[0], "sun4m")) | |
281 | sparc_cpu_model = sun4m; | |
282 | if (!strcmp(&cputypval[0], "sun4s")) | |
283 | sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */ | |
284 | if (!strcmp(&cputypval[0], "sun4d")) | |
285 | sparc_cpu_model = sun4d; | |
286 | if (!strcmp(&cputypval[0], "sun4e")) | |
287 | sparc_cpu_model = sun4e; | |
288 | if (!strcmp(&cputypval[0], "sun4u")) | |
289 | sparc_cpu_model = sun4u; | |
290 | if (!strncmp(&cputypval[0], "leon" , 4)) | |
291 | sparc_cpu_model = sparc_leon; | |
292 | ||
293 | leon_patch(); | |
4efb55e6 SR |
294 | start_kernel(); |
295 | } | |
296 | ||
1da177e4 LT |
297 | void __init setup_arch(char **cmdline_p) |
298 | { | |
299 | int i; | |
300 | unsigned long highest_paddr; | |
301 | ||
3c46e2d6 | 302 | sparc_ttable = &trapbase; |
1da177e4 LT |
303 | |
304 | /* Initialize PROM console and command line. */ | |
305 | *cmdline_p = prom_getbootargs(); | |
117a0c5f | 306 | strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE); |
3fbe36d8 | 307 | parse_early_param(); |
1da177e4 | 308 | |
7671fa22 SR |
309 | boot_flags_init(*cmdline_p); |
310 | ||
311 | register_console(&prom_early_console); | |
312 | ||
1da177e4 LT |
313 | printk("ARCH: "); |
314 | switch(sparc_cpu_model) { | |
1da177e4 LT |
315 | case sun4m: |
316 | printk("SUN4M\n"); | |
317 | break; | |
318 | case sun4d: | |
319 | printk("SUN4D\n"); | |
320 | break; | |
321 | case sun4e: | |
322 | printk("SUN4E\n"); | |
323 | break; | |
324 | case sun4u: | |
325 | printk("SUN4U\n"); | |
326 | break; | |
0fd7ef1f KE |
327 | case sparc_leon: |
328 | printk("LEON\n"); | |
329 | break; | |
1da177e4 LT |
330 | default: |
331 | printk("UNKNOWN!\n"); | |
332 | break; | |
6cb79b3f | 333 | } |
1da177e4 LT |
334 | |
335 | #ifdef CONFIG_DUMMY_CONSOLE | |
336 | conswitchp = &dummy_con; | |
1da177e4 | 337 | #endif |
1da177e4 LT |
338 | |
339 | idprom_init(); | |
1da177e4 | 340 | load_mmu(); |
1da177e4 LT |
341 | |
342 | phys_base = 0xffffffffUL; | |
343 | highest_paddr = 0UL; | |
344 | for (i = 0; sp_banks[i].num_bytes != 0; i++) { | |
345 | unsigned long top; | |
346 | ||
347 | if (sp_banks[i].base_addr < phys_base) | |
348 | phys_base = sp_banks[i].base_addr; | |
349 | top = sp_banks[i].base_addr + | |
350 | sp_banks[i].num_bytes; | |
351 | if (highest_paddr < top) | |
352 | highest_paddr = top; | |
353 | } | |
354 | pfn_base = phys_base >> PAGE_SHIFT; | |
355 | ||
356 | if (!root_flags) | |
357 | root_mountflags &= ~MS_RDONLY; | |
358 | ROOT_DEV = old_decode_dev(root_dev); | |
5d2170ad | 359 | #ifdef CONFIG_BLK_DEV_RAM |
1da177e4 LT |
360 | rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK; |
361 | rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0); | |
362 | rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0); | |
363 | #endif | |
364 | ||
365 | prom_setsync(prom_sync_me); | |
366 | ||
d191723f | 367 | if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) && |
1da177e4 LT |
368 | ((*(short *)linux_dbvec) != -1)) { |
369 | printk("Booted under KADB. Syncing trap table.\n"); | |
370 | (*(linux_dbvec->teach_debugger))(); | |
371 | } | |
372 | ||
1da177e4 LT |
373 | init_task.thread.kregs = &fake_swapper_regs; |
374 | ||
1edc1783 | 375 | /* Run-time patch instructions to match the cpu model */ |
c68e5d39 DM |
376 | per_cpu_patch(); |
377 | ||
1edc1783 SR |
378 | paging_init(); |
379 | ||
a23b423e | 380 | smp_setup_cpu_possible_map(); |
1da177e4 LT |
381 | } |
382 | ||
1da177e4 LT |
383 | extern int stop_a_enabled; |
384 | ||
385 | void sun_do_break(void) | |
386 | { | |
387 | if (!stop_a_enabled) | |
388 | return; | |
389 | ||
390 | printk("\n"); | |
391 | flush_user_windows(); | |
392 | ||
393 | prom_cmdline(); | |
394 | } | |
6943f3da | 395 | EXPORT_SYMBOL(sun_do_break); |
1da177e4 | 396 | |
1da177e4 | 397 | int stop_a_enabled = 1; |
a8cbdcea BB |
398 | |
399 | static int __init topology_init(void) | |
400 | { | |
401 | int i, ncpus, err; | |
402 | ||
403 | /* Count the number of physically present processors in | |
404 | * the machine, even on uniprocessor, so that /proc/cpuinfo | |
405 | * output is consistent with 2.4.x | |
406 | */ | |
407 | ncpus = 0; | |
408 | while (!cpu_find_by_instance(ncpus, NULL, NULL)) | |
409 | ncpus++; | |
410 | ncpus_probed = ncpus; | |
411 | ||
412 | err = 0; | |
413 | for_each_online_cpu(i) { | |
414 | struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL); | |
415 | if (!p) | |
416 | err = -ENOMEM; | |
417 | else | |
94583779 | 418 | register_cpu(p, i); |
a8cbdcea BB |
419 | } |
420 | ||
421 | return err; | |
422 | } | |
423 | ||
424 | subsys_initcall(topology_init); |