3249d3f3234d5535fa9381e47702eeeba809a10c
[linux-2.6.git] / arch / sparc / kernel / setup_32.c
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
35 #include <asm/system.h>
36 #include <asm/io.h>
37 #include <asm/processor.h>
38 #include <asm/oplib.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/vaddrs.h>
43 #include <asm/mbus.h>
44 #include <asm/idprom.h>
45 #include <asm/machines.h>
46 #include <asm/cpudata.h>
47 #include <asm/setup.h>
48
49 #include "kernel.h"
50
51 struct screen_info screen_info = {
52         0, 0,                   /* orig-x, orig-y */
53         0,                      /* unused */
54         0,                      /* orig-video-page */
55         0,                      /* orig-video-mode */
56         128,                    /* orig-video-cols */
57         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
58         54,                     /* orig-video-lines */
59         0,                      /* orig-video-isVGA */
60         16                      /* orig-video-points */
61 };
62
63 /* Typing sync at the prom prompt calls the function pointed to by
64  * romvec->pv_synchook which I set to the following function.
65  * This should sync all filesystems and return, for now it just
66  * prints out pretty messages and returns.
67  */
68
69 extern unsigned long trapbase;
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(current->pid != 0) {
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 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */
109
110 static void
111 prom_console_write(struct console *con, const char *s, unsigned 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                 /* Just ignore, this behavior is now the default.  */
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 && *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 /* This routine will in the future do all the nasty prom stuff
185  * to probe for the mmu type and its parameters, etc. This will
186  * also be where SMP things happen.
187  */
188
189 extern void sun4c_probe_vac(void);
190
191 extern unsigned short root_flags;
192 extern unsigned short root_dev;
193 extern unsigned short ram_flags;
194 #define RAMDISK_IMAGE_START_MASK        0x07FF
195 #define RAMDISK_PROMPT_FLAG             0x8000
196 #define RAMDISK_LOAD_FLAG               0x4000
197
198 extern int root_mountflags;
199
200 char reboot_command[COMMAND_LINE_SIZE];
201
202 enum sparc_cpu sparc_cpu_model;
203 EXPORT_SYMBOL(sparc_cpu_model);
204
205 struct tt_entry *sparc_ttable;
206
207 struct pt_regs fake_swapper_regs;
208
209 void __init setup_arch(char **cmdline_p)
210 {
211         int i;
212         unsigned long highest_paddr;
213
214         sparc_ttable = (struct tt_entry *) &trapbase;
215
216         /* Initialize PROM console and command line. */
217         *cmdline_p = prom_getbootargs();
218         strcpy(boot_command_line, *cmdline_p);
219         parse_early_param();
220
221         boot_flags_init(*cmdline_p);
222
223         register_console(&prom_early_console);
224
225         /* Set sparc_cpu_model */
226         sparc_cpu_model = sun_unknown;
227         if (!strcmp(&cputypval[0], "sun4 "))
228                 sparc_cpu_model = sun4;
229         if (!strcmp(&cputypval[0], "sun4c"))
230                 sparc_cpu_model = sun4c;
231         if (!strcmp(&cputypval[0], "sun4m"))
232                 sparc_cpu_model = sun4m;
233         if (!strcmp(&cputypval[0], "sun4s"))
234                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
235         if (!strcmp(&cputypval[0], "sun4d"))
236                 sparc_cpu_model = sun4d;
237         if (!strcmp(&cputypval[0], "sun4e"))
238                 sparc_cpu_model = sun4e;
239         if (!strcmp(&cputypval[0], "sun4u"))
240                 sparc_cpu_model = sun4u;
241         if (!strncmp(&cputypval[0], "leon" , 4))
242                 sparc_cpu_model = sparc_leon;
243
244         printk("ARCH: ");
245         switch(sparc_cpu_model) {
246         case sun4:
247                 printk("SUN4\n");
248                 break;
249         case sun4c:
250                 printk("SUN4C\n");
251                 break;
252         case sun4m:
253                 printk("SUN4M\n");
254                 break;
255         case sun4d:
256                 printk("SUN4D\n");
257                 break;
258         case sun4e:
259                 printk("SUN4E\n");
260                 break;
261         case sun4u:
262                 printk("SUN4U\n");
263                 break;
264         case sparc_leon:
265                 printk("LEON\n");
266                 break;
267         default:
268                 printk("UNKNOWN!\n");
269                 break;
270         };
271
272 #ifdef CONFIG_DUMMY_CONSOLE
273         conswitchp = &dummy_con;
274 #endif
275
276         idprom_init();
277         if (ARCH_SUN4C)
278                 sun4c_probe_vac();
279         load_mmu();
280
281         phys_base = 0xffffffffUL;
282         highest_paddr = 0UL;
283         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
284                 unsigned long top;
285
286                 if (sp_banks[i].base_addr < phys_base)
287                         phys_base = sp_banks[i].base_addr;
288                 top = sp_banks[i].base_addr +
289                         sp_banks[i].num_bytes;
290                 if (highest_paddr < top)
291                         highest_paddr = top;
292         }
293         pfn_base = phys_base >> PAGE_SHIFT;
294
295         if (!root_flags)
296                 root_mountflags &= ~MS_RDONLY;
297         ROOT_DEV = old_decode_dev(root_dev);
298 #ifdef CONFIG_BLK_DEV_RAM
299         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
300         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
301         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
302 #endif
303
304         prom_setsync(prom_sync_me);
305
306         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
307            ((*(short *)linux_dbvec) != -1)) {
308                 printk("Booted under KADB. Syncing trap table.\n");
309                 (*(linux_dbvec->teach_debugger))();
310         }
311
312         init_mm.context = (unsigned long) NO_CONTEXT;
313         init_task.thread.kregs = &fake_swapper_regs;
314
315         paging_init();
316
317         smp_setup_cpu_possible_map();
318 }
319
320 extern int stop_a_enabled;
321
322 void sun_do_break(void)
323 {
324         if (!stop_a_enabled)
325                 return;
326
327         printk("\n");
328         flush_user_windows();
329
330         prom_cmdline();
331 }
332 EXPORT_SYMBOL(sun_do_break);
333
334 int stop_a_enabled = 1;
335
336 static int __init topology_init(void)
337 {
338         int i, ncpus, err;
339
340         /* Count the number of physically present processors in
341          * the machine, even on uniprocessor, so that /proc/cpuinfo
342          * output is consistent with 2.4.x
343          */
344         ncpus = 0;
345         while (!cpu_find_by_instance(ncpus, NULL, NULL))
346                 ncpus++;
347         ncpus_probed = ncpus;
348
349         err = 0;
350         for_each_online_cpu(i) {
351                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
352                 if (!p)
353                         err = -ENOMEM;
354                 else
355                         register_cpu(p, i);
356         }
357
358         return err;
359 }
360
361 subsys_initcall(topology_init);