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Linux/arch/sparc/kernel/setup_32.c

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

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