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
53struct 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
71extern unsigned long trapbase;
72
73/* Pretty sick eh? */
74static void prom_sync_me(void)
75{
76	unsigned long prom_tbr, flags;
77
78	/* XXX Badly broken. FIX! - Anton */
79	local_irq_save(flags);
80	__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
81	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
82			     "nop\n\t"
83			     "nop\n\t"
84			     "nop\n\t" : : "r" (&trapbase));
85
86	prom_printf("PROM SYNC COMMAND...\n");
87	show_free_areas(0);
88	if (!is_idle_task(current)) {
89		local_irq_enable();
90		sys_sync();
91		local_irq_disable();
92	}
93	prom_printf("Returning to prom\n");
94
95	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
96			     "nop\n\t"
97			     "nop\n\t"
98			     "nop\n\t" : : "r" (prom_tbr));
99	local_irq_restore(flags);
100}
101
102static unsigned int boot_flags __initdata = 0;
103#define BOOTME_DEBUG  0x1
104
105/* Exported for mm/init.c:paging_init. */
106unsigned long cmdline_memory_size __initdata = 0;
107
108/* which CPU booted us (0xff = not set) */
109unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
110
111static void
112prom_console_write(struct console *con, const char *s, unsigned n)
113{
114	prom_write(s, n);
115}
116
117static struct console prom_early_console = {
118	.name =		"earlyprom",
119	.write =	prom_console_write,
120	.flags =	CON_PRINTBUFFER | CON_BOOT,
121	.index =	-1,
122};
123
124/*
125 * Process kernel command line switches that are specific to the
126 * SPARC or that require special low-level processing.
127 */
128static void __init process_switch(char c)
129{
130	switch (c) {
131	case 'd':
132		boot_flags |= BOOTME_DEBUG;
133		break;
134	case 's':
135		break;
136	case 'h':
137		prom_printf("boot_flags_init: Halt!\n");
138		prom_halt();
139		break;
140	case 'p':
141		prom_early_console.flags &= ~CON_BOOT;
142		break;
143	default:
144		printk("Unknown boot switch (-%c)\n", c);
145		break;
146	}
147}
148
149static void __init boot_flags_init(char *commands)
150{
151	while (*commands) {
152		/* Move to the start of the next "argument". */
153		while (*commands && *commands == ' ')
154			commands++;
155
156		/* Process any command switches, otherwise skip it. */
157		if (*commands == '\0')
158			break;
159		if (*commands == '-') {
160			commands++;
161			while (*commands && *commands != ' ')
162				process_switch(*commands++);
163			continue;
164		}
165		if (!strncmp(commands, "mem=", 4)) {
166			/*
167			 * "mem=XXX[kKmM] overrides the PROM-reported
168			 * memory size.
169			 */
170			cmdline_memory_size = simple_strtoul(commands + 4,
171						     &commands, 0);
172			if (*commands == 'K' || *commands == 'k') {
173				cmdline_memory_size <<= 10;
174				commands++;
175			} else if (*commands=='M' || *commands=='m') {
176				cmdline_memory_size <<= 20;
177				commands++;
178			}
179		}
180		while (*commands && *commands != ' ')
181			commands++;
182	}
183}
184
185extern unsigned short root_flags;
186extern unsigned short root_dev;
187extern unsigned short ram_flags;
188#define RAMDISK_IMAGE_START_MASK	0x07FF
189#define RAMDISK_PROMPT_FLAG		0x8000
190#define RAMDISK_LOAD_FLAG		0x4000
191
192extern int root_mountflags;
193
194char reboot_command[COMMAND_LINE_SIZE];
195
196struct cpuid_patch_entry {
197	unsigned int	addr;
198	unsigned int	sun4d[3];
199	unsigned int	leon[3];
200};
201extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
202
203static void __init per_cpu_patch(void)
204{
205	struct cpuid_patch_entry *p;
206
207	if (sparc_cpu_model == sun4m) {
208		/* Nothing to do, this is what the unpatched code
209		 * targets.
210		 */
211		return;
212	}
213
214	p = &__cpuid_patch;
215	while (p < &__cpuid_patch_end) {
216		unsigned long addr = p->addr;
217		unsigned int *insns;
218
219		switch (sparc_cpu_model) {
220		case sun4d:
221			insns = &p->sun4d[0];
222			break;
223
224		case sparc_leon:
225			insns = &p->leon[0];
226			break;
227		default:
228			prom_printf("Unknown cpu type, halting.\n");
229			prom_halt();
230		}
231		*(unsigned int *) (addr + 0) = insns[0];
232		flushi(addr + 0);
233		*(unsigned int *) (addr + 4) = insns[1];
234		flushi(addr + 4);
235		*(unsigned int *) (addr + 8) = insns[2];
236		flushi(addr + 8);
237
238		p++;
239	}
240}
241
242struct leon_1insn_patch_entry {
243	unsigned int addr;
244	unsigned int insn;
245};
246
247enum sparc_cpu sparc_cpu_model;
248EXPORT_SYMBOL(sparc_cpu_model);
249
250static __init void leon_patch(void)
251{
252	struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
253	struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
254
255	/* Default instruction is leon - no patching */
256	if (sparc_cpu_model == sparc_leon)
257		return;
258
259	while (start < end) {
260		unsigned long addr = start->addr;
261
262		*(unsigned int *)(addr) = start->insn;
263		flushi(addr);
264
265		start++;
266	}
267}
268
269struct tt_entry *sparc_ttable;
270static struct pt_regs fake_swapper_regs;
271
272/* Called from head_32.S - before we have setup anything
273 * in the kernel. Be very careful with what you do here.
274 */
275void __init sparc32_start_kernel(struct linux_romvec *rp)
276{
277	prom_init(rp);
278
279	/* Set sparc_cpu_model */
280	sparc_cpu_model = sun_unknown;
281	if (!strcmp(&cputypval[0], "sun4m"))
282		sparc_cpu_model = sun4m;
283	if (!strcmp(&cputypval[0], "sun4s"))
284		sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
285	if (!strcmp(&cputypval[0], "sun4d"))
286		sparc_cpu_model = sun4d;
287	if (!strcmp(&cputypval[0], "sun4e"))
288		sparc_cpu_model = sun4e;
289	if (!strcmp(&cputypval[0], "sun4u"))
290		sparc_cpu_model = sun4u;
291	if (!strncmp(&cputypval[0], "leon" , 4))
292		sparc_cpu_model = sparc_leon;
293
294	leon_patch();
295	start_kernel();
296}
297
298void __init setup_arch(char **cmdline_p)
299{
300	int i;
301	unsigned long highest_paddr;
302
303	sparc_ttable = (struct tt_entry *) &trapbase;
304
305	/* Initialize PROM console and command line. */
306	*cmdline_p = prom_getbootargs();
307	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
308	parse_early_param();
309
310	boot_flags_init(*cmdline_p);
311
312	register_console(&prom_early_console);
313
314	printk("ARCH: ");
315	switch(sparc_cpu_model) {
316	case sun4m:
317		printk("SUN4M\n");
318		break;
319	case sun4d:
320		printk("SUN4D\n");
321		break;
322	case sun4e:
323		printk("SUN4E\n");
324		break;
325	case sun4u:
326		printk("SUN4U\n");
327		break;
328	case sparc_leon:
329		printk("LEON\n");
330		break;
331	default:
332		printk("UNKNOWN!\n");
333		break;
334	}
335
336#ifdef CONFIG_DUMMY_CONSOLE
337	conswitchp = &dummy_con;
338#endif
339
340	idprom_init();
341	load_mmu();
342
343	phys_base = 0xffffffffUL;
344	highest_paddr = 0UL;
345	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
346		unsigned long top;
347
348		if (sp_banks[i].base_addr < phys_base)
349			phys_base = sp_banks[i].base_addr;
350		top = sp_banks[i].base_addr +
351			sp_banks[i].num_bytes;
352		if (highest_paddr < top)
353			highest_paddr = top;
354	}
355	pfn_base = phys_base >> PAGE_SHIFT;
356
357	if (!root_flags)
358		root_mountflags &= ~MS_RDONLY;
359	ROOT_DEV = old_decode_dev(root_dev);
360#ifdef CONFIG_BLK_DEV_RAM
361	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
362	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
363	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
364#endif
365
366	prom_setsync(prom_sync_me);
367
368	if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
369	   ((*(short *)linux_dbvec) != -1)) {
370		printk("Booted under KADB. Syncing trap table.\n");
371		(*(linux_dbvec->teach_debugger))();
372	}
373
374	init_task.thread.kregs = &fake_swapper_regs;
375
376	/* Run-time patch instructions to match the cpu model */
377	per_cpu_patch();
378
379	paging_init();
380
381	smp_setup_cpu_possible_map();
382}
383
384extern int stop_a_enabled;
385
386void sun_do_break(void)
387{
388	if (!stop_a_enabled)
389		return;
390
391	printk("\n");
392	flush_user_windows();
393
394	prom_cmdline();
395}
396EXPORT_SYMBOL(sun_do_break);
397
398int stop_a_enabled = 1;
399
400static int __init topology_init(void)
401{
402	int i, ncpus, err;
403
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
407	 */
408	ncpus = 0;
409	while (!cpu_find_by_instance(ncpus, NULL, NULL))
410		ncpus++;
411	ncpus_probed = ncpus;
412
413	err = 0;
414	for_each_online_cpu(i) {
415		struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
416		if (!p)
417			err = -ENOMEM;
418		else
419			register_cpu(p, i);
420	}
421
422	return err;
423}
424
425subsys_initcall(topology_init);
426