1 // SPDX-License-Identifier: GPL-2.0
2 /*
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>
20 #include <linux/screen_info.h>
21 #include <linux/delay.h>
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>
33 #include <linux/cpu.h>
34 #include <linux/kdebug.h>
35 #include <linux/export.h>
36 #include <linux/start_kernel.h>
37 #include <uapi/linux/mount.h>
38
39 #include <asm/io.h>
40 #include <asm/processor.h>
41 #include <asm/oplib.h>
42 #include <asm/page.h>
43 #include <asm/pgtable.h>
44 #include <asm/traps.h>
45 #include <asm/vaddrs.h>
46 #include <asm/mbus.h>
47 #include <asm/idprom.h>
48 #include <asm/cpudata.h>
49 #include <asm/setup.h>
50 #include <asm/cacheflush.h>
51 #include <asm/sections.h>
52
53 #include "kernel.h"
54
55 struct screen_info screen_info = {
56 0, 0, /* orig-x, orig-y */
57 0, /* unused */
58 0, /* orig-video-page */
59 0, /* orig-video-mode */
60 128, /* orig-video-cols */
61 0,0,0, /* ega_ax, ega_bx, ega_cx */
62 54, /* orig-video-lines */
63 0, /* orig-video-isVGA */
64 16 /* orig-video-points */
65 };
66
67 /* Typing sync at the prom prompt calls the function pointed to by
68 * romvec->pv_synchook which I set to the following function.
69 * This should sync all filesystems and return, for now it just
70 * prints out pretty messages and returns.
71 */
72
73 /* Pretty sick eh? */
prom_sync_me(void)74 static void prom_sync_me(void)
75 {
76 unsigned long prom_tbr, flags;
77
78 /* XXX Badly broken. FIX! - Anton */
79 local_irq_save(flags);
80 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
81 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
82 "nop\n\t"
83 "nop\n\t"
84 "nop\n\t" : : "r" (&trapbase));
85
86 prom_printf("PROM SYNC COMMAND...\n");
87 show_free_areas(0, NULL);
88 if (!is_idle_task(current)) {
89 local_irq_enable();
90 ksys_sync();
91 local_irq_disable();
92 }
93 prom_printf("Returning to prom\n");
94
95 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
96 "nop\n\t"
97 "nop\n\t"
98 "nop\n\t" : : "r" (prom_tbr));
99 local_irq_restore(flags);
100 }
101
102 static unsigned int boot_flags __initdata = 0;
103 #define BOOTME_DEBUG 0x1
104
105 /* Exported for mm/init.c:paging_init. */
106 unsigned long cmdline_memory_size __initdata = 0;
107
108 /* which CPU booted us (0xff = not set) */
109 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
110
111 static void
prom_console_write(struct console * con,const char * s,unsigned int n)112 prom_console_write(struct console *con, const char *s, unsigned int n)
113 {
114 prom_write(s, n);
115 }
116
117 static struct console prom_early_console = {
118 .name = "earlyprom",
119 .write = prom_console_write,
120 .flags = CON_PRINTBUFFER | CON_BOOT,
121 .index = -1,
122 };
123
124 /*
125 * Process kernel command line switches that are specific to the
126 * SPARC or that require special low-level processing.
127 */
process_switch(char c)128 static void __init process_switch(char c)
129 {
130 switch (c) {
131 case 'd':
132 boot_flags |= BOOTME_DEBUG;
133 break;
134 case 's':
135 break;
136 case 'h':
137 prom_printf("boot_flags_init: Halt!\n");
138 prom_halt();
139 break;
140 case 'p':
141 prom_early_console.flags &= ~CON_BOOT;
142 break;
143 default:
144 printk("Unknown boot switch (-%c)\n", c);
145 break;
146 }
147 }
148
boot_flags_init(char * commands)149 static void __init boot_flags_init(char *commands)
150 {
151 while (*commands) {
152 /* Move to the start of the next "argument". */
153 while (*commands == ' ')
154 commands++;
155
156 /* Process any command switches, otherwise skip it. */
157 if (*commands == '\0')
158 break;
159 if (*commands == '-') {
160 commands++;
161 while (*commands && *commands != ' ')
162 process_switch(*commands++);
163 continue;
164 }
165 if (!strncmp(commands, "mem=", 4)) {
166 /*
167 * "mem=XXX[kKmM] overrides the PROM-reported
168 * memory size.
169 */
170 cmdline_memory_size = simple_strtoul(commands + 4,
171 &commands, 0);
172 if (*commands == 'K' || *commands == 'k') {
173 cmdline_memory_size <<= 10;
174 commands++;
175 } else if (*commands=='M' || *commands=='m') {
176 cmdline_memory_size <<= 20;
177 commands++;
178 }
179 }
180 while (*commands && *commands != ' ')
181 commands++;
182 }
183 }
184
185 extern unsigned short root_flags;
186 extern unsigned short root_dev;
187 extern unsigned short ram_flags;
188 #define RAMDISK_IMAGE_START_MASK 0x07FF
189 #define RAMDISK_PROMPT_FLAG 0x8000
190 #define RAMDISK_LOAD_FLAG 0x4000
191
192 extern int root_mountflags;
193
194 char reboot_command[COMMAND_LINE_SIZE];
195
196 struct cpuid_patch_entry {
197 unsigned int addr;
198 unsigned int sun4d[3];
199 unsigned int leon[3];
200 };
201 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
202
per_cpu_patch(void)203 static void __init per_cpu_patch(void)
204 {
205 struct cpuid_patch_entry *p;
206
207 if (sparc_cpu_model == sun4m) {
208 /* Nothing to do, this is what the unpatched code
209 * targets.
210 */
211 return;
212 }
213
214 p = &__cpuid_patch;
215 while (p < &__cpuid_patch_end) {
216 unsigned long addr = p->addr;
217 unsigned int *insns;
218
219 switch (sparc_cpu_model) {
220 case sun4d:
221 insns = &p->sun4d[0];
222 break;
223
224 case sparc_leon:
225 insns = &p->leon[0];
226 break;
227 default:
228 prom_printf("Unknown cpu type, halting.\n");
229 prom_halt();
230 }
231 *(unsigned int *) (addr + 0) = insns[0];
232 flushi(addr + 0);
233 *(unsigned int *) (addr + 4) = insns[1];
234 flushi(addr + 4);
235 *(unsigned int *) (addr + 8) = insns[2];
236 flushi(addr + 8);
237
238 p++;
239 }
240 }
241
242 struct leon_1insn_patch_entry {
243 unsigned int addr;
244 unsigned int insn;
245 };
246
247 enum sparc_cpu sparc_cpu_model;
248 EXPORT_SYMBOL(sparc_cpu_model);
249
leon_patch(void)250 static __init void leon_patch(void)
251 {
252 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
253 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
254
255 /* Default instruction is leon - no patching */
256 if (sparc_cpu_model == sparc_leon)
257 return;
258
259 while (start < end) {
260 unsigned long addr = start->addr;
261
262 *(unsigned int *)(addr) = start->insn;
263 flushi(addr);
264
265 start++;
266 }
267 }
268
269 struct tt_entry *sparc_ttable;
270 static struct pt_regs fake_swapper_regs;
271
272 /* Called from head_32.S - before we have setup anything
273 * in the kernel. Be very careful with what you do here.
274 */
sparc32_start_kernel(struct linux_romvec * rp)275 void __init sparc32_start_kernel(struct linux_romvec *rp)
276 {
277 prom_init(rp);
278
279 /* Set sparc_cpu_model */
280 sparc_cpu_model = sun_unknown;
281 if (!strcmp(&cputypval[0], "sun4m"))
282 sparc_cpu_model = sun4m;
283 if (!strcmp(&cputypval[0], "sun4s"))
284 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
285 if (!strcmp(&cputypval[0], "sun4d"))
286 sparc_cpu_model = sun4d;
287 if (!strcmp(&cputypval[0], "sun4e"))
288 sparc_cpu_model = sun4e;
289 if (!strcmp(&cputypval[0], "sun4u"))
290 sparc_cpu_model = sun4u;
291 if (!strncmp(&cputypval[0], "leon" , 4))
292 sparc_cpu_model = sparc_leon;
293
294 leon_patch();
295 start_kernel();
296 }
297
setup_arch(char ** cmdline_p)298 void __init setup_arch(char **cmdline_p)
299 {
300 int i;
301 unsigned long highest_paddr;
302
303 sparc_ttable = &trapbase;
304
305 /* Initialize PROM console and command line. */
306 *cmdline_p = prom_getbootargs();
307 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
308 parse_early_param();
309
310 boot_flags_init(*cmdline_p);
311
312 register_console(&prom_early_console);
313
314 switch(sparc_cpu_model) {
315 case sun4m:
316 pr_info("ARCH: SUN4M\n");
317 break;
318 case sun4d:
319 pr_info("ARCH: SUN4D\n");
320 break;
321 case sun4e:
322 pr_info("ARCH: SUN4E\n");
323 break;
324 case sun4u:
325 pr_info("ARCH: SUN4U\n");
326 break;
327 case sparc_leon:
328 pr_info("ARCH: LEON\n");
329 break;
330 default:
331 pr_info("ARCH: UNKNOWN!\n");
332 break;
333 }
334
335 #ifdef CONFIG_DUMMY_CONSOLE
336 conswitchp = &dummy_con;
337 #endif
338
339 idprom_init();
340 load_mmu();
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);
359 #ifdef CONFIG_BLK_DEV_RAM
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
367 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
368 ((*(short *)linux_dbvec) != -1)) {
369 printk("Booted under KADB. Syncing trap table.\n");
370 (*(linux_dbvec->teach_debugger))();
371 }
372
373 init_task.thread.kregs = &fake_swapper_regs;
374
375 /* Run-time patch instructions to match the cpu model */
376 per_cpu_patch();
377
378 paging_init();
379
380 smp_setup_cpu_possible_map();
381 }
382
383 extern int stop_a_enabled;
384
sun_do_break(void)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 }
395 EXPORT_SYMBOL(sun_do_break);
396
397 int stop_a_enabled = 1;
398
topology_init(void)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
418 register_cpu(p, i);
419 }
420
421 return err;
422 }
423
424 subsys_initcall(topology_init);
425
426 #if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP)
arch_cpu_finalize_init(void)427 void __init arch_cpu_finalize_init(void)
428 {
429 cpu_data(0).udelay_val = loops_per_jiffy;
430 }
431 #endif
432