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(current
->pid
!= 0) {
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 /* Just ignore, this behavior is now the default. */
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
);