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>
34 #include <linux/export.h>
36 #include <asm/system.h>
38 #include <asm/processor.h>
39 #include <asm/oplib.h>
41 #include <asm/pgtable.h>
42 #include <asm/traps.h>
43 #include <asm/vaddrs.h>
45 #include <asm/idprom.h>
46 #include <asm/machines.h>
47 #include <asm/cpudata.h>
48 #include <asm/setup.h>
52 struct screen_info screen_info = {
53 0, 0, /* orig-x, orig-y */
55 0, /* orig-video-page */
56 0, /* orig-video-mode */
57 128, /* orig-video-cols */
58 0,0,0, /* ega_ax, ega_bx, ega_cx */
59 54, /* orig-video-lines */
60 0, /* orig-video-isVGA */
61 16 /* orig-video-points */
64 /* Typing sync at the prom prompt calls the function pointed to by
65 * romvec->pv_synchook which I set to the following function.
66 * This should sync all filesystems and return, for now it just
67 * prints out pretty messages and returns.
70 extern unsigned long trapbase;
73 static void prom_sync_me(void)
75 unsigned long prom_tbr, flags;
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"
83 "nop\n\t" : : "r" (&trapbase));
85 prom_printf("PROM SYNC COMMAND...\n");
87 if (!is_idle_task(current)) {
92 prom_printf("Returning to prom\n");
94 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
97 "nop\n\t" : : "r" (prom_tbr));
98 local_irq_restore(flags);
101 static unsigned int boot_flags __initdata = 0;
102 #define BOOTME_DEBUG 0x1
104 /* Exported for mm/init.c:paging_init. */
105 unsigned long cmdline_memory_size __initdata = 0;
107 /* which CPU booted us (0xff = not set) */
108 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
109 unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */
112 prom_console_write(struct console *con, const char *s, unsigned n)
117 static struct console prom_early_console = {
119 .write = prom_console_write,
120 .flags = CON_PRINTBUFFER | CON_BOOT,
125 * Process kernel command line switches that are specific to the
126 * SPARC or that require special low-level processing.
128 static void __init process_switch(char c)
132 boot_flags |= BOOTME_DEBUG;
137 prom_printf("boot_flags_init: Halt!\n");
141 prom_early_console.flags &= ~CON_BOOT;
144 printk("Unknown boot switch (-%c)\n", c);
149 static void __init boot_flags_init(char *commands)
152 /* Move to the start of the next "argument". */
153 while (*commands && *commands == ' ')
156 /* Process any command switches, otherwise skip it. */
157 if (*commands == '\0')
159 if (*commands == '-') {
161 while (*commands && *commands != ' ')
162 process_switch(*commands++);
165 if (!strncmp(commands, "mem=", 4)) {
167 * "mem=XXX[kKmM] overrides the PROM-reported
170 cmdline_memory_size = simple_strtoul(commands + 4,
172 if (*commands == 'K' || *commands == 'k') {
173 cmdline_memory_size <<= 10;
175 } else if (*commands=='M' || *commands=='m') {
176 cmdline_memory_size <<= 20;
180 while (*commands && *commands != ' ')
185 /* This routine will in the future do all the nasty prom stuff
186 * to probe for the mmu type and its parameters, etc. This will
187 * also be where SMP things happen.
190 extern void sun4c_probe_vac(void);
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 *) &trapbase;
217 /* Initialize PROM console and command line. */
218 *cmdline_p = prom_getbootargs();
219 strcpy(boot_command_line, *cmdline_p);
222 boot_flags_init(*cmdline_p);
224 register_console(&prom_early_console);
226 /* Set sparc_cpu_model */
227 sparc_cpu_model = sun_unknown;
228 if (!strcmp(&cputypval[0], "sun4 "))
229 sparc_cpu_model = sun4;
230 if (!strcmp(&cputypval[0], "sun4c"))
231 sparc_cpu_model = sun4c;
232 if (!strcmp(&cputypval[0], "sun4m"))
233 sparc_cpu_model = sun4m;
234 if (!strcmp(&cputypval[0], "sun4s"))
235 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
236 if (!strcmp(&cputypval[0], "sun4d"))
237 sparc_cpu_model = sun4d;
238 if (!strcmp(&cputypval[0], "sun4e"))
239 sparc_cpu_model = sun4e;
240 if (!strcmp(&cputypval[0], "sun4u"))
241 sparc_cpu_model = sun4u;
242 if (!strncmp(&cputypval[0], "leon" , 4))
243 sparc_cpu_model = sparc_leon;
246 switch(sparc_cpu_model) {
269 printk("UNKNOWN!\n");
273 #ifdef CONFIG_DUMMY_CONSOLE
274 conswitchp = &dummy_con;
282 phys_base = 0xffffffffUL;
284 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
287 if (sp_banks[i].base_addr < phys_base)
288 phys_base = sp_banks[i].base_addr;
289 top = sp_banks[i].base_addr +
290 sp_banks[i].num_bytes;
291 if (highest_paddr < top)
294 pfn_base = phys_base >> PAGE_SHIFT;
297 root_mountflags &= ~MS_RDONLY;
298 ROOT_DEV = old_decode_dev(root_dev);
299 #ifdef CONFIG_BLK_DEV_RAM
300 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
301 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
302 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
305 prom_setsync(prom_sync_me);
307 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
308 ((*(short *)linux_dbvec) != -1)) {
309 printk("Booted under KADB. Syncing trap table.\n");
310 (*(linux_dbvec->teach_debugger))();
313 init_mm.context = (unsigned long) NO_CONTEXT;
314 init_task.thread.kregs = &fake_swapper_regs;
318 smp_setup_cpu_possible_map();
321 extern int stop_a_enabled;
323 void sun_do_break(void)
329 flush_user_windows();
333 EXPORT_SYMBOL(sun_do_break);
335 int stop_a_enabled = 1;
337 static int __init topology_init(void)
341 /* Count the number of physically present processors in
342 * the machine, even on uniprocessor, so that /proc/cpuinfo
343 * output is consistent with 2.4.x
346 while (!cpu_find_by_instance(ncpus, NULL, NULL))
348 ncpus_probed = ncpus;
351 for_each_online_cpu(i) {
352 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
362 subsys_initcall(topology_init);