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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sparc/kernel/setup.c
4 *
5 * Copyright (C) 1995 David S. Miller ([email protected])
6 * Copyright (C) 2000 Anton Blanchard ([email protected])
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/delay.h>
21#include <linux/fs.h>
22#include <linux/seq_file.h>
23#include <linux/syscalls.h>
24#include <linux/kdev_t.h>
25#include <linux/major.h>
26#include <linux/string.h>
27#include <linux/init.h>
28#include <linux/interrupt.h>
29#include <linux/console.h>
30#include <linux/spinlock.h>
31#include <linux/root_dev.h>
32#include <linux/cpu.h>
33#include <linux/kdebug.h>
34#include <linux/export.h>
35#include <linux/start_kernel.h>
36#include <uapi/linux/mount.h>
37
38#include <asm/io.h>
39#include <asm/processor.h>
40#include <asm/oplib.h>
41#include <asm/page.h>
42#include <asm/traps.h>
43#include <asm/vaddrs.h>
44#include <asm/mbus.h>
45#include <asm/idprom.h>
46#include <asm/cpudata.h>
47#include <asm/setup.h>
48#include <asm/cacheflush.h>
49#include <asm/sections.h>
50
51#include "kernel.h"
52
53/* Typing sync at the prom prompt calls the function pointed to by
54 * romvec->pv_synchook which I set to the following function.
55 * This should sync all filesystems and return, for now it just
56 * prints out pretty messages and returns.
57 */
58
59/* Pretty sick eh? */
60static void prom_sync_me(void)
61{
62 unsigned long prom_tbr, flags;
63
64 /* XXX Badly broken. FIX! - Anton */
65 local_irq_save(flags);
66 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
67 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
68 "nop\n\t"
69 "nop\n\t"
70 "nop\n\t" : : "r" (&trapbase[0]));
71
72 prom_printf("PROM SYNC COMMAND...\n");
73 show_mem();
74 if (!is_idle_task(current)) {
75 local_irq_enable();
76 ksys_sync();
77 local_irq_disable();
78 }
79 prom_printf("Returning to prom\n");
80
81 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
82 "nop\n\t"
83 "nop\n\t"
84 "nop\n\t" : : "r" (prom_tbr));
85 local_irq_restore(flags);
86}
87
88static unsigned int boot_flags __initdata = 0;
89#define BOOTME_DEBUG 0x1
90
91/* Exported for mm/init.c:paging_init. */
92unsigned long cmdline_memory_size __initdata = 0;
93
94/* which CPU booted us (0xff = not set) */
95unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
96
97static void
98prom_console_write(struct console *con, const char *s, unsigned int n)
99{
100 prom_write(s, n);
101}
102
103static struct console prom_early_console = {
104 .name = "earlyprom",
105 .write = prom_console_write,
106 .flags = CON_PRINTBUFFER | CON_BOOT,
107 .index = -1,
108};
109
110/*
111 * Process kernel command line switches that are specific to the
112 * SPARC or that require special low-level processing.
113 */
114static void __init process_switch(char c)
115{
116 switch (c) {
117 case 'd':
118 boot_flags |= BOOTME_DEBUG;
119 break;
120 case 's':
121 break;
122 case 'h':
123 prom_printf("boot_flags_init: Halt!\n");
124 prom_halt();
125 break;
126 case 'p':
127 prom_early_console.flags &= ~CON_BOOT;
128 break;
129 default:
130 printk("Unknown boot switch (-%c)\n", c);
131 break;
132 }
133}
134
135static void __init boot_flags_init(char *commands)
136{
137 while (*commands) {
138 /* Move to the start of the next "argument". */
139 while (*commands == ' ')
140 commands++;
141
142 /* Process any command switches, otherwise skip it. */
143 if (*commands == '\0')
144 break;
145 if (*commands == '-') {
146 commands++;
147 while (*commands && *commands != ' ')
148 process_switch(*commands++);
149 continue;
150 }
151 if (!strncmp(commands, "mem=", 4)) {
152 /*
153 * "mem=XXX[kKmM] overrides the PROM-reported
154 * memory size.
155 */
156 cmdline_memory_size = simple_strtoul(commands + 4,
157 &commands, 0);
158 if (*commands == 'K' || *commands == 'k') {
159 cmdline_memory_size <<= 10;
160 commands++;
161 } else if (*commands=='M' || *commands=='m') {
162 cmdline_memory_size <<= 20;
163 commands++;
164 }
165 }
166 while (*commands && *commands != ' ')
167 commands++;
168 }
169}
170
171extern unsigned short root_flags;
172extern unsigned short root_dev;
173extern unsigned short ram_flags;
174#define RAMDISK_IMAGE_START_MASK 0x07FF
175#define RAMDISK_PROMPT_FLAG 0x8000
176#define RAMDISK_LOAD_FLAG 0x4000
177
178extern int root_mountflags;
179
180char reboot_command[COMMAND_LINE_SIZE];
181
182struct cpuid_patch_entry {
183 unsigned int addr;
184 unsigned int sun4d[3];
185 unsigned int leon[3];
186};
187extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
188
189static void __init per_cpu_patch(void)
190{
191 struct cpuid_patch_entry *p;
192
193 if (sparc_cpu_model == sun4m) {
194 /* Nothing to do, this is what the unpatched code
195 * targets.
196 */
197 return;
198 }
199
200 p = &__cpuid_patch;
201 while (p < &__cpuid_patch_end) {
202 unsigned long addr = p->addr;
203 unsigned int *insns;
204
205 switch (sparc_cpu_model) {
206 case sun4d:
207 insns = &p->sun4d[0];
208 break;
209
210 case sparc_leon:
211 insns = &p->leon[0];
212 break;
213 default:
214 prom_printf("Unknown cpu type, halting.\n");
215 prom_halt();
216 }
217 *(unsigned int *) (addr + 0) = insns[0];
218 flushi(addr + 0);
219 *(unsigned int *) (addr + 4) = insns[1];
220 flushi(addr + 4);
221 *(unsigned int *) (addr + 8) = insns[2];
222 flushi(addr + 8);
223
224 p++;
225 }
226}
227
228struct leon_1insn_patch_entry {
229 unsigned int addr;
230 unsigned int insn;
231};
232
233enum sparc_cpu sparc_cpu_model;
234EXPORT_SYMBOL(sparc_cpu_model);
235
236static __init void leon_patch(void)
237{
238 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
239 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
240
241 /* Default instruction is leon - no patching */
242 if (sparc_cpu_model == sparc_leon)
243 return;
244
245 while (start < end) {
246 unsigned long addr = start->addr;
247
248 *(unsigned int *)(addr) = start->insn;
249 flushi(addr);
250
251 start++;
252 }
253}
254
255struct tt_entry *sparc_ttable;
256
257/* Called from head_32.S - before we have setup anything
258 * in the kernel. Be very careful with what you do here.
259 */
260void __init sparc32_start_kernel(struct linux_romvec *rp)
261{
262 prom_init(rp);
263
264 /* Set sparc_cpu_model */
265 sparc_cpu_model = sun_unknown;
266 if (!strcmp(&cputypval[0], "sun4m"))
267 sparc_cpu_model = sun4m;
268 if (!strcmp(&cputypval[0], "sun4s"))
269 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
270 if (!strcmp(&cputypval[0], "sun4d"))
271 sparc_cpu_model = sun4d;
272 if (!strcmp(&cputypval[0], "sun4e"))
273 sparc_cpu_model = sun4e;
274 if (!strcmp(&cputypval[0], "sun4u"))
275 sparc_cpu_model = sun4u;
276 if (!strncmp(&cputypval[0], "leon" , 4))
277 sparc_cpu_model = sparc_leon;
278
279 leon_patch();
280 start_kernel();
281}
282
283void __init setup_arch(char **cmdline_p)
284{
285 int i;
286 unsigned long highest_paddr;
287
288 sparc_ttable = &trapbase[0];
289
290 /* Initialize PROM console and command line. */
291 *cmdline_p = prom_getbootargs();
292 strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
293 parse_early_param();
294
295 boot_flags_init(*cmdline_p);
296
297 register_console(&prom_early_console);
298
299 switch(sparc_cpu_model) {
300 case sun4m:
301 pr_info("ARCH: SUN4M\n");
302 break;
303 case sun4d:
304 pr_info("ARCH: SUN4D\n");
305 break;
306 case sun4e:
307 pr_info("ARCH: SUN4E\n");
308 break;
309 case sun4u:
310 pr_info("ARCH: SUN4U\n");
311 break;
312 case sparc_leon:
313 pr_info("ARCH: LEON\n");
314 break;
315 default:
316 pr_info("ARCH: UNKNOWN!\n");
317 break;
318 }
319
320 idprom_init();
321 load_mmu();
322
323 phys_base = 0xffffffffUL;
324 highest_paddr = 0UL;
325 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
326 unsigned long top;
327
328 if (sp_banks[i].base_addr < phys_base)
329 phys_base = sp_banks[i].base_addr;
330 top = sp_banks[i].base_addr +
331 sp_banks[i].num_bytes;
332 if (highest_paddr < top)
333 highest_paddr = top;
334 }
335 pfn_base = phys_base >> PAGE_SHIFT;
336
337 if (!root_flags)
338 root_mountflags &= ~MS_RDONLY;
339 ROOT_DEV = old_decode_dev(root_dev);
340#ifdef CONFIG_BLK_DEV_RAM
341 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
342#endif
343
344 prom_setsync(prom_sync_me);
345
346 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
347 ((*(short *)linux_dbvec) != -1)) {
348 printk("Booted under KADB. Syncing trap table.\n");
349 (*(linux_dbvec->teach_debugger))();
350 }
351
352 /* Run-time patch instructions to match the cpu model */
353 per_cpu_patch();
354
355 paging_init();
356
357 smp_setup_cpu_possible_map();
358}
359
360extern int stop_a_enabled;
361
362void sun_do_break(void)
363{
364 if (!stop_a_enabled)
365 return;
366
367 printk("\n");
368 flush_user_windows();
369
370 prom_cmdline();
371}
372EXPORT_SYMBOL(sun_do_break);
373
374int stop_a_enabled = 1;
375
376static int __init topology_init(void)
377{
378 int i, ncpus, err;
379
380 /* Count the number of physically present processors in
381 * the machine, even on uniprocessor, so that /proc/cpuinfo
382 * output is consistent with 2.4.x
383 */
384 ncpus = 0;
385 while (!cpu_find_by_instance(ncpus, NULL, NULL))
386 ncpus++;
387 ncpus_probed = ncpus;
388
389 err = 0;
390 for_each_online_cpu(i) {
391 struct cpu *p = kzalloc_obj(*p);
392 if (!p)
393 err = -ENOMEM;
394 else
395 register_cpu(p, i);
396 }
397
398 return err;
399}
400
401subsys_initcall(topology_init);
402
403#if defined(CONFIG_SPARC32) && !defined(CONFIG_SMP)
404void __init arch_cpu_finalize_init(void)
405{
406 cpu_data(0).udelay_val = loops_per_jiffy;
407}
408#endif