2 * linux/arch/sparc/kernel/setup.c
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
8 #include <linux/errno.h>
9 #include <linux/sched.h>
10 #include <linux/kernel.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>
18 #include <linux/user.h>
19 #include <linux/screen_info.h>
20 #include <linux/delay.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>
35 #include <asm/system.h>
37 #include <asm/processor.h>
38 #include <asm/oplib.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/vaddrs.h>
44 #include <asm/idprom.h>
45 #include <asm/machines.h>
46 #include <asm/cpudata.h>
47 #include <asm/setup.h>
51 struct screen_info screen_info = {
52 0, 0, /* orig-x, orig-y */
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 */
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.
69 extern unsigned long trapbase;
72 static void prom_sync_me(void)
74 unsigned long prom_tbr, flags;
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"
82 "nop\n\t" : : "r" (&trapbase));
84 prom_printf("PROM SYNC COMMAND...\n");
86 if(current->pid != 0) {
91 prom_printf("Returning to prom\n");
93 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
96 "nop\n\t" : : "r" (prom_tbr));
97 local_irq_restore(flags);
102 static unsigned int boot_flags __initdata = 0;
103 #define BOOTME_DEBUG 0x1
105 /* Exported for mm/init.c:paging_init. */
106 unsigned long cmdline_memory_size __initdata = 0;
109 prom_console_write(struct console *con, const char *s, unsigned n)
114 static struct console prom_debug_console = {
116 .write = prom_console_write,
117 .flags = CON_PRINTBUFFER,
122 * Process kernel command line switches that are specific to the
123 * SPARC or that require special low-level processing.
125 static void __init process_switch(char c)
129 boot_flags |= BOOTME_DEBUG;
134 prom_printf("boot_flags_init: Halt!\n");
138 /* Use PROM debug console. */
139 register_console(&prom_debug_console);
142 printk("Unknown boot switch (-%c)\n", c);
147 static void __init boot_flags_init(char *commands)
150 /* Move to the start of the next "argument". */
151 while (*commands && *commands == ' ')
154 /* Process any command switches, otherwise skip it. */
155 if (*commands == '\0')
157 if (*commands == '-') {
159 while (*commands && *commands != ' ')
160 process_switch(*commands++);
163 if (!strncmp(commands, "mem=", 4)) {
165 * "mem=XXX[kKmM] overrides the PROM-reported
168 cmdline_memory_size = simple_strtoul(commands + 4,
170 if (*commands == 'K' || *commands == 'k') {
171 cmdline_memory_size <<= 10;
173 } else if (*commands=='M' || *commands=='m') {
174 cmdline_memory_size <<= 20;
178 while (*commands && *commands != ' ')
183 /* This routine will in the future do all the nasty prom stuff
184 * to probe for the mmu type and its parameters, etc. This will
185 * also be where SMP things happen.
188 extern void sun4c_probe_vac(void);
189 extern char cputypval;
190 extern unsigned long start, end;
192 extern unsigned short root_flags;
193 extern unsigned short root_dev;
194 extern unsigned short ram_flags;
195 #define RAMDISK_IMAGE_START_MASK 0x07FF
196 #define RAMDISK_PROMPT_FLAG 0x8000
197 #define RAMDISK_LOAD_FLAG 0x4000
199 extern int root_mountflags;
201 char reboot_command[COMMAND_LINE_SIZE];
203 enum sparc_cpu sparc_cpu_model;
204 EXPORT_SYMBOL(sparc_cpu_model);
206 struct tt_entry *sparc_ttable;
208 struct pt_regs fake_swapper_regs;
210 void __init setup_arch(char **cmdline_p)
213 unsigned long highest_paddr;
215 sparc_ttable = (struct tt_entry *) &start;
217 /* Initialize PROM console and command line. */
218 *cmdline_p = prom_getbootargs();
219 strcpy(boot_command_line, *cmdline_p);
222 /* Set sparc_cpu_model */
223 sparc_cpu_model = sun_unknown;
224 if (!strcmp(&cputypval,"sun4 "))
225 sparc_cpu_model = sun4;
226 if (!strcmp(&cputypval,"sun4c"))
227 sparc_cpu_model = sun4c;
228 if (!strcmp(&cputypval,"sun4m"))
229 sparc_cpu_model = sun4m;
230 if (!strcmp(&cputypval,"sun4s"))
231 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
232 if (!strcmp(&cputypval,"sun4d"))
233 sparc_cpu_model = sun4d;
234 if (!strcmp(&cputypval,"sun4e"))
235 sparc_cpu_model = sun4e;
236 if (!strcmp(&cputypval,"sun4u"))
237 sparc_cpu_model = sun4u;
240 switch(sparc_cpu_model) {
260 printk("UNKNOWN!\n");
264 #ifdef CONFIG_DUMMY_CONSOLE
265 conswitchp = &dummy_con;
266 #elif defined(CONFIG_PROM_CONSOLE)
267 conswitchp = &prom_con;
269 boot_flags_init(*cmdline_p);
276 phys_base = 0xffffffffUL;
278 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
281 if (sp_banks[i].base_addr < phys_base)
282 phys_base = sp_banks[i].base_addr;
283 top = sp_banks[i].base_addr +
284 sp_banks[i].num_bytes;
285 if (highest_paddr < top)
288 pfn_base = phys_base >> PAGE_SHIFT;
291 root_mountflags &= ~MS_RDONLY;
292 ROOT_DEV = old_decode_dev(root_dev);
293 #ifdef CONFIG_BLK_DEV_RAM
294 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
295 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
296 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
299 prom_setsync(prom_sync_me);
301 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
302 ((*(short *)linux_dbvec) != -1)) {
303 printk("Booted under KADB. Syncing trap table.\n");
304 (*(linux_dbvec->teach_debugger))();
307 init_mm.context = (unsigned long) NO_CONTEXT;
308 init_task.thread.kregs = &fake_swapper_regs;
312 smp_setup_cpu_possible_map();
315 static int ncpus_probed;
317 static int show_cpuinfo(struct seq_file *m, void *__unused)
322 "promlib\t\t: Version %d Revision %d\n"
325 "ncpus probed\t: %d\n"
326 "ncpus active\t: %d\n"
328 "CPU0Bogo\t: %lu.%02lu\n"
329 "CPU0ClkTck\t: %ld\n"
336 romvec->pv_printrev >> 16,
337 romvec->pv_printrev & 0xffff,
342 , cpu_data(0).udelay_val/(500000/HZ),
343 (cpu_data(0).udelay_val/(5000/HZ)) % 100,
344 cpu_data(0).clock_tick
358 static void *c_start(struct seq_file *m, loff_t *pos)
360 /* The pointer we are returning is arbitrary,
361 * it just has to be non-NULL and not IS_ERR
362 * in the success case.
364 return *pos == 0 ? &c_start : NULL;
367 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
370 return c_start(m, pos);
373 static void c_stop(struct seq_file *m, void *v)
377 const struct seq_operations cpuinfo_op = {
381 .show = show_cpuinfo,
384 extern int stop_a_enabled;
386 void sun_do_break(void)
392 flush_user_windows();
396 EXPORT_SYMBOL(sun_do_break);
398 int stop_a_enabled = 1;
400 static int __init topology_init(void)
404 /* Count the number of physically present processors in
405 * the machine, even on uniprocessor, so that /proc/cpuinfo
406 * output is consistent with 2.4.x
409 while (!cpu_find_by_instance(ncpus, NULL, NULL))
411 ncpus_probed = ncpus;
414 for_each_online_cpu(i) {
415 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
425 subsys_initcall(topology_init);