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/traps.h>
44 #include <asm/vaddrs.h>
45 #include <asm/mbus.h>
46 #include <asm/idprom.h>
47 #include <asm/cpudata.h>
48 #include <asm/setup.h>
49 #include <asm/cacheflush.h>
50 #include <asm/sections.h>
51
52 #include "kernel.h"
53
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
72 /* Pretty sick eh? */
prom_sync_me(void)73 static void prom_sync_me(void)
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
85 prom_printf("PROM SYNC COMMAND...\n");
86 show_free_areas(0, NULL);
87 if (!is_idle_task(current)) {
88 local_irq_enable();
89 ksys_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);
99 }
100
101 static unsigned int boot_flags __initdata = 0;
102 #define BOOTME_DEBUG 0x1
103
104 /* Exported for mm/init.c:paging_init. */
105 unsigned long cmdline_memory_size __initdata = 0;
106
107 /* which CPU booted us (0xff = not set) */
108 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
109
110 static void
prom_console_write(struct console * con,const char * s,unsigned int n)111 prom_console_write(struct console *con, const char *s, unsigned int n)
112 {
113 prom_write(s, n);
114 }
115
116 static struct console prom_early_console = {
117 .name = "earlyprom",
118 .write = prom_console_write,
119 .flags = CON_PRINTBUFFER | CON_BOOT,
120 .index = -1,
121 };
122
123 /*
124 * Process kernel command line switches that are specific to the
125 * SPARC or that require special low-level processing.
126 */
process_switch(char c)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':
134 break;
135 case 'h':
136 prom_printf("boot_flags_init: Halt!\n");
137 prom_halt();
138 break;
139 case 'p':
140 prom_early_console.flags &= ~CON_BOOT;
141 break;
142 default:
143 printk("Unknown boot switch (-%c)\n", c);
144 break;
145 }
146 }
147
boot_flags_init(char * commands)148 static void __init boot_flags_init(char *commands)
149 {
150 while (*commands) {
151 /* Move to the start of the next "argument". */
152 while (*commands == ' ')
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 }
164 if (!strncmp(commands, "mem=", 4)) {
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
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];
194
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
per_cpu_patch(void)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];
231 flushi(addr + 0);
232 *(unsigned int *) (addr + 4) = insns[1];
233 flushi(addr + 4);
234 *(unsigned int *) (addr + 8) = insns[2];
235 flushi(addr + 8);
236
237 p++;
238 }
239 }
240
241 struct leon_1insn_patch_entry {
242 unsigned int addr;
243 unsigned int insn;
244 };
245
246 enum sparc_cpu sparc_cpu_model;
247 EXPORT_SYMBOL(sparc_cpu_model);
248
leon_patch(void)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 }
267
268 struct tt_entry *sparc_ttable;
269 static struct pt_regs fake_swapper_regs;
270
271 /* Called from head_32.S - before we have setup anything
272 * in the kernel. Be very careful with what you do here.
273 */
sparc32_start_kernel(struct linux_romvec * rp)274 void __init sparc32_start_kernel(struct linux_romvec *rp)
275 {
276 prom_init(rp);
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();
294 start_kernel();
295 }
296
setup_arch(char ** cmdline_p)297 void __init setup_arch(char **cmdline_p)
298 {
299 int i;
300 unsigned long highest_paddr;
301
302 sparc_ttable = &trapbase;
303
304 /* Initialize PROM console and command line. */
305 *cmdline_p = prom_getbootargs();
306 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
307 parse_early_param();
308
309 boot_flags_init(*cmdline_p);
310
311 register_console(&prom_early_console);
312
313 switch(sparc_cpu_model) {
314 case sun4m:
315 pr_info("ARCH: SUN4M\n");
316 break;
317 case sun4d:
318 pr_info("ARCH: SUN4D\n");
319 break;
320 case sun4e:
321 pr_info("ARCH: SUN4E\n");
322 break;
323 case sun4u:
324 pr_info("ARCH: SUN4U\n");
325 break;
326 case sparc_leon:
327 pr_info("ARCH: LEON\n");
328 break;
329 default:
330 pr_info("ARCH: UNKNOWN!\n");
331 break;
332 }
333
334 idprom_init();
335 load_mmu();
336
337 phys_base = 0xffffffffUL;
338 highest_paddr = 0UL;
339 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
340 unsigned long top;
341
342 if (sp_banks[i].base_addr < phys_base)
343 phys_base = sp_banks[i].base_addr;
344 top = sp_banks[i].base_addr +
345 sp_banks[i].num_bytes;
346 if (highest_paddr < top)
347 highest_paddr = top;
348 }
349 pfn_base = phys_base >> PAGE_SHIFT;
350
351 if (!root_flags)
352 root_mountflags &= ~MS_RDONLY;
353 ROOT_DEV = old_decode_dev(root_dev);
354 #ifdef CONFIG_BLK_DEV_RAM
355 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
356 #endif
357
358 prom_setsync(prom_sync_me);
359
360 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
361 ((*(short *)linux_dbvec) != -1)) {
362 printk("Booted under KADB. Syncing trap table.\n");
363 (*(linux_dbvec->teach_debugger))();
364 }
365
366 init_task.thread.kregs = &fake_swapper_regs;
367
368 /* Run-time patch instructions to match the cpu model */
369 per_cpu_patch();
370
371 paging_init();
372
373 smp_setup_cpu_possible_map();
374 }
375
376 extern int stop_a_enabled;
377
sun_do_break(void)378 void sun_do_break(void)
379 {
380 if (!stop_a_enabled)
381 return;
382
383 printk("\n");
384 flush_user_windows();
385
386 prom_cmdline();
387 }
388 EXPORT_SYMBOL(sun_do_break);
389
390 int stop_a_enabled = 1;
391
topology_init(void)392 static int __init topology_init(void)
393 {
394 int i, ncpus, err;
395
396 /* Count the number of physically present processors in
397 * the machine, even on uniprocessor, so that /proc/cpuinfo
398 * output is consistent with 2.4.x
399 */
400 ncpus = 0;
401 while (!cpu_find_by_instance(ncpus, NULL, NULL))
402 ncpus++;
403 ncpus_probed = ncpus;
404
405 err = 0;
406 for_each_online_cpu(i) {
407 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
408 if (!p)
409 err = -ENOMEM;
410 else
411 register_cpu(p, i);
412 }
413
414 return err;
415 }
416
417 subsys_initcall(topology_init);
418
