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Linux/arch/sparc/kernel/setup_32.c

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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 (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? */
 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
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  */
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 
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 
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 
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 
270 /* Called from head_32.S - before we have setup anything
271  * in the kernel. Be very careful with what you do here.
272  */
273 void __init sparc32_start_kernel(struct linux_romvec *rp)
274 {
275         prom_init(rp);
276 
277         /* Set sparc_cpu_model */
278         sparc_cpu_model = sun_unknown;
279         if (!strcmp(&cputypval[0], "sun4m"))
280                 sparc_cpu_model = sun4m;
281         if (!strcmp(&cputypval[0], "sun4s"))
282                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
283         if (!strcmp(&cputypval[0], "sun4d"))
284                 sparc_cpu_model = sun4d;
285         if (!strcmp(&cputypval[0], "sun4e"))
286                 sparc_cpu_model = sun4e;
287         if (!strcmp(&cputypval[0], "sun4u"))
288                 sparc_cpu_model = sun4u;
289         if (!strncmp(&cputypval[0], "leon" , 4))
290                 sparc_cpu_model = sparc_leon;
291 
292         leon_patch();
293         start_kernel();
294 }
295 
296 void __init setup_arch(char **cmdline_p)
297 {
298         int i;
299         unsigned long highest_paddr;
300 
301         sparc_ttable = &trapbase;
302 
303         /* Initialize PROM console and command line. */
304         *cmdline_p = prom_getbootargs();
305         strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
306         parse_early_param();
307 
308         boot_flags_init(*cmdline_p);
309 
310         register_console(&prom_early_console);
311 
312         switch(sparc_cpu_model) {
313         case sun4m:
314                 pr_info("ARCH: SUN4M\n");
315                 break;
316         case sun4d:
317                 pr_info("ARCH: SUN4D\n");
318                 break;
319         case sun4e:
320                 pr_info("ARCH: SUN4E\n");
321                 break;
322         case sun4u:
323                 pr_info("ARCH: SUN4U\n");
324                 break;
325         case sparc_leon:
326                 pr_info("ARCH: LEON\n");
327                 break;
328         default:
329                 pr_info("ARCH: UNKNOWN!\n");
330                 break;
331         }
332 
333         idprom_init();
334         load_mmu();
335 
336         phys_base = 0xffffffffUL;
337         highest_paddr = 0UL;
338         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
339                 unsigned long top;
340 
341                 if (sp_banks[i].base_addr < phys_base)
342                         phys_base = sp_banks[i].base_addr;
343                 top = sp_banks[i].base_addr +
344                         sp_banks[i].num_bytes;
345                 if (highest_paddr < top)
346                         highest_paddr = top;
347         }
348         pfn_base = phys_base >> PAGE_SHIFT;
349 
350         if (!root_flags)
351                 root_mountflags &= ~MS_RDONLY;
352         ROOT_DEV = old_decode_dev(root_dev);
353 #ifdef CONFIG_BLK_DEV_RAM
354         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
355 #endif
356 
357         prom_setsync(prom_sync_me);
358 
359         if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
360            ((*(short *)linux_dbvec) != -1)) {
361                 printk("Booted under KADB. Syncing trap table.\n");
362                 (*(linux_dbvec->teach_debugger))();
363         }
364 
365         /* Run-time patch instructions to match the cpu model */
366         per_cpu_patch();
367 
368         paging_init();
369 
370         smp_setup_cpu_possible_map();
371 }
372 
373 extern int stop_a_enabled;
374 
375 void sun_do_break(void)
376 {
377         if (!stop_a_enabled)
378                 return;
379 
380         printk("\n");
381         flush_user_windows();
382 
383         prom_cmdline();
384 }
385 EXPORT_SYMBOL(sun_do_break);
386 
387 int stop_a_enabled = 1;
388 
389 static int __init topology_init(void)
390 {
391         int i, ncpus, err;
392 
393         /* Count the number of physically present processors in
394          * the machine, even on uniprocessor, so that /proc/cpuinfo
395          * output is consistent with 2.4.x
396          */
397         ncpus = 0;
398         while (!cpu_find_by_instance(ncpus, NULL, NULL))
399                 ncpus++;
400         ncpus_probed = ncpus;
401 
402         err = 0;
403         for_each_online_cpu(i) {
404                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
405                 if (!p)
406                         err = -ENOMEM;
407                 else
408                         register_cpu(p, i);
409         }
410 
411         return err;
412 }
413 
414 subsys_initcall(topology_init);
415 

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