[mirror_ubuntu-bionic-kernel.git] / arch / sparc / kernel / setup_32.c

/*
 *  linux/arch/sparc/kernel/setup.c
 *
 *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/initrd.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/spinlock.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/kdebug.h>
#include <linux/export.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
#include <asm/vaddrs.h>
#include <asm/mbus.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/cpudata.h>
#include <asm/setup.h>

#include "kernel.h"

struct screen_info screen_info = {
	0, 0,			/* orig-x, orig-y */
	0,			/* unused */
	0,			/* orig-video-page */
	0,			/* orig-video-mode */
	128,			/* orig-video-cols */
	0,0,0,			/* ega_ax, ega_bx, ega_cx */
	54,			/* orig-video-lines */
	0,                      /* orig-video-isVGA */
	16                      /* orig-video-points */
};

/* Typing sync at the prom prompt calls the function pointed to by
 * romvec->pv_synchook which I set to the following function.
 * This should sync all filesystems and return, for now it just
 * prints out pretty messages and returns.
 */

extern unsigned long trapbase;

/* Pretty sick eh? */
static void prom_sync_me(void)
{
	unsigned long prom_tbr, flags;

	/* XXX Badly broken. FIX! - Anton */
	local_irq_save(flags);
	__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
			     "nop\n\t"
			     "nop\n\t"
			     "nop\n\t" : : "r" (&trapbase));

	prom_printf("PROM SYNC COMMAND...\n");
	show_free_areas(0);
	if(current->pid != 0) {
		local_irq_enable();
		sys_sync();
		local_irq_disable();
	}
	prom_printf("Returning to prom\n");

	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
			     "nop\n\t"
			     "nop\n\t"
			     "nop\n\t" : : "r" (prom_tbr));
	local_irq_restore(flags);
}

static unsigned int boot_flags __initdata = 0;
#define BOOTME_DEBUG  0x1

/* Exported for mm/init.c:paging_init. */
unsigned long cmdline_memory_size __initdata = 0;

/* which CPU booted us (0xff = not set) */
unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */

static void
prom_console_write(struct console *con, const char *s, unsigned n)
{
	prom_write(s, n);
}

static struct console prom_early_console = {
	.name =		"earlyprom",
	.write =	prom_console_write,
	.flags =	CON_PRINTBUFFER | CON_BOOT,
	.index =	-1,
};

/* 
 * Process kernel command line switches that are specific to the
 * SPARC or that require special low-level processing.
 */
static void __init process_switch(char c)
{
	switch (c) {
	case 'd':
		boot_flags |= BOOTME_DEBUG;
		break;
	case 's':
		break;
	case 'h':
		prom_printf("boot_flags_init: Halt!\n");
		prom_halt();
		break;
	case 'p':
		prom_early_console.flags &= ~CON_BOOT;
		break;
	default:
		printk("Unknown boot switch (-%c)\n", c);
		break;
	}
}

static void __init boot_flags_init(char *commands)
{
	while (*commands) {
		/* Move to the start of the next "argument". */
		while (*commands && *commands == ' ')
			commands++;

		/* Process any command switches, otherwise skip it. */
		if (*commands == '\0')
			break;
		if (*commands == '-') {
			commands++;
			while (*commands && *commands != ' ')
				process_switch(*commands++);
			continue;
		}
		if (!strncmp(commands, "mem=", 4)) {
			/*
			 * "mem=XXX[kKmM] overrides the PROM-reported
			 * memory size.
			 */
			cmdline_memory_size = simple_strtoul(commands + 4,
						     &commands, 0);
			if (*commands == 'K' || *commands == 'k') {
				cmdline_memory_size <<= 10;
				commands++;
			} else if (*commands=='M' || *commands=='m') {
				cmdline_memory_size <<= 20;
				commands++;
			}
		}
		while (*commands && *commands != ' ')
			commands++;
	}
}

/* This routine will in the future do all the nasty prom stuff
 * to probe for the mmu type and its parameters, etc. This will
 * also be where SMP things happen.
 */

extern void sun4c_probe_vac(void);

extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK	0x07FF
#define RAMDISK_PROMPT_FLAG		0x8000
#define RAMDISK_LOAD_FLAG		0x4000

extern int root_mountflags;

char reboot_command[COMMAND_LINE_SIZE];

enum sparc_cpu sparc_cpu_model;
EXPORT_SYMBOL(sparc_cpu_model);

struct tt_entry *sparc_ttable;

struct pt_regs fake_swapper_regs;

void __init setup_arch(char **cmdline_p)
{
	int i;
	unsigned long highest_paddr;

	sparc_ttable = (struct tt_entry *) &trapbase;

	/* Initialize PROM console and command line. */
	*cmdline_p = prom_getbootargs();
	strcpy(boot_command_line, *cmdline_p);
	parse_early_param();

	boot_flags_init(*cmdline_p);

	register_console(&prom_early_console);

	/* Set sparc_cpu_model */
	sparc_cpu_model = sun_unknown;
	if (!strcmp(&cputypval[0], "sun4 "))
		sparc_cpu_model = sun4;
	if (!strcmp(&cputypval[0], "sun4c"))
		sparc_cpu_model = sun4c;
	if (!strcmp(&cputypval[0], "sun4m"))
		sparc_cpu_model = sun4m;
	if (!strcmp(&cputypval[0], "sun4s"))
		sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
	if (!strcmp(&cputypval[0], "sun4d"))
		sparc_cpu_model = sun4d;
	if (!strcmp(&cputypval[0], "sun4e"))
		sparc_cpu_model = sun4e;
	if (!strcmp(&cputypval[0], "sun4u"))
		sparc_cpu_model = sun4u;
	if (!strncmp(&cputypval[0], "leon" , 4))
		sparc_cpu_model = sparc_leon;

	printk("ARCH: ");
	switch(sparc_cpu_model) {
	case sun4:
		printk("SUN4\n");
		break;
	case sun4c:
		printk("SUN4C\n");
		break;
	case sun4m:
		printk("SUN4M\n");
		break;
	case sun4d:
		printk("SUN4D\n");
		break;
	case sun4e:
		printk("SUN4E\n");
		break;
	case sun4u:
		printk("SUN4U\n");
		break;
	case sparc_leon:
		printk("LEON\n");
		break;
	default:
		printk("UNKNOWN!\n");
		break;
	}

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	idprom_init();
	if (ARCH_SUN4C)
		sun4c_probe_vac();
	load_mmu();

	phys_base = 0xffffffffUL;
	highest_paddr = 0UL;
	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		unsigned long top;

		if (sp_banks[i].base_addr < phys_base)
			phys_base = sp_banks[i].base_addr;
		top = sp_banks[i].base_addr +
			sp_banks[i].num_bytes;
		if (highest_paddr < top)
			highest_paddr = top;
	}
	pfn_base = phys_base >> PAGE_SHIFT;

	if (!root_flags)
		root_mountflags &= ~MS_RDONLY;
	ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);	
#endif

	prom_setsync(prom_sync_me);

	if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
	   ((*(short *)linux_dbvec) != -1)) {
		printk("Booted under KADB. Syncing trap table.\n");
		(*(linux_dbvec->teach_debugger))();
	}

	init_mm.context = (unsigned long) NO_CONTEXT;
	init_task.thread.kregs = &fake_swapper_regs;

	paging_init();

	smp_setup_cpu_possible_map();
}

extern int stop_a_enabled;

void sun_do_break(void)
{
	if (!stop_a_enabled)
		return;

	printk("\n");
	flush_user_windows();

	prom_cmdline();
}
EXPORT_SYMBOL(sun_do_break);

int stop_a_enabled = 1;

static int __init topology_init(void)
{
	int i, ncpus, err;

	/* Count the number of physically present processors in
	 * the machine, even on uniprocessor, so that /proc/cpuinfo
	 * output is consistent with 2.4.x
	 */
	ncpus = 0;
	while (!cpu_find_by_instance(ncpus, NULL, NULL))
		ncpus++;
	ncpus_probed = ncpus;

	err = 0;
	for_each_online_cpu(i) {
		struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
		if (!p)
			err = -ENOMEM;
		else
			register_cpu(p, i);
	}

	return err;
}

subsys_initcall(topology_init);
Commit	Line	Data
88278ca2	1	/*
1da177e4 LT	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>
894673ee	19	#include <linux/screen_info.h>
1da177e4	20	#include <linux/delay.h>
1da177e4 LT	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>
a8cbdcea	32	#include <linux/cpu.h>
1eeb66a1	33	#include <linux/kdebug.h>
7b64db60	34	#include <linux/export.h>
1da177e4	35
1da177e4 LT	36	#include <asm/system.h>
	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>
1da177e4 LT	44	#include <asm/mbus.h>
	45	#include <asm/idprom.h>
	46	#include <asm/machines.h>
	47	#include <asm/cpudata.h>
	48	#include <asm/setup.h>
	49
53ae3419 SR	50	#include "kernel.h"
53ae3419 SR	51
1da177e4 LT	52	struct screen_info screen_info = {
	53	0, 0, /* orig-x, orig-y */
	54	0, /* unused */
	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 */
	62	};
	63
	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.
	68	*/
	69
	70	extern unsigned long trapbase;
1da177e4 LT	71
1da177e4 LT	72	/* Pretty sick eh? */
c61c65cd	73	static void prom_sync_me(void)
1da177e4 LT	74	{
	75	unsigned long prom_tbr, flags;
	76
	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"
	81	"nop\n\t"
	82	"nop\n\t"
	83	"nop\n\t" : : "r" (&trapbase));
	84
1da177e4	85	prom_printf("PROM SYNC COMMAND...\n");
7bf02ea2	86	show_free_areas(0);
1da177e4 LT	87	if(current->pid != 0) {
	88	local_irq_enable();
	89	sys_sync();
	90	local_irq_disable();
	91	}
	92	prom_printf("Returning to prom\n");
	93
	94	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
	95	"nop\n\t"
	96	"nop\n\t"
	97	"nop\n\t" : : "r" (prom_tbr));
	98	local_irq_restore(flags);
1da177e4 LT	99	}
1da177e4 LT	100
c61c65cd	101	static unsigned int boot_flags __initdata = 0;
1da177e4	102	#define BOOTME_DEBUG 0x1
1da177e4 LT	103
	104	/* Exported for mm/init.c:paging_init. */
	105	unsigned long cmdline_memory_size __initdata = 0;
	106
5fcafb7a DH	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 */
	110
1da177e4 LT	111	static void
	112	prom_console_write(struct console con, const char s, unsigned n)
	113	{
	114	prom_write(s, n);
	115	}
	116
7671fa22 SR	117	static struct console prom_early_console = {
7671fa22 SR	118	.name = "earlyprom",
1da177e4	119	.write = prom_console_write,
7671fa22	120	.flags = CON_PRINTBUFFER \| CON_BOOT,
1da177e4 LT	121	.index = -1,
	122	};
	123
1da177e4 LT	124	/*
	125	* Process kernel command line switches that are specific to the
	126	* SPARC or that require special low-level processing.
	127	*/
	128	static void __init process_switch(char c)
	129	{
	130	switch (c) {
	131	case 'd':
	132	boot_flags \|= BOOTME_DEBUG;
	133	break;
	134	case 's':
1da177e4 LT	135	break;
	136	case 'h':
	137	prom_printf("boot_flags_init: Halt!\n");
	138	prom_halt();
	139	break;
	140	case 'p':
11032c17	141	prom_early_console.flags &= ~CON_BOOT;
1da177e4 LT	142	break;
	143	default:
	144	printk("Unknown boot switch (-%c)\n", c);
	145	break;
	146	}
	147	}
	148
1da177e4 LT	149	static 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	}
c73fcc84	165	if (!strncmp(commands, "mem=", 4)) {
1da177e4 LT	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
	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
9f2b2a5f	187	* also be where SMP things happen.
1da177e4 LT	188	*/
1da177e4 LT	189
1da177e4	190	extern void sun4c_probe_vac(void);
1da177e4 LT	191
	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
	198
	199	extern int root_mountflags;
	200
	201	char reboot_command[COMMAND_LINE_SIZE];
6943f3da	202
1da177e4	203	enum sparc_cpu sparc_cpu_model;
6943f3da	204	EXPORT_SYMBOL(sparc_cpu_model);
1da177e4 LT	205
	206	struct tt_entry *sparc_ttable;
	207
	208	struct pt_regs fake_swapper_regs;
	209
1da177e4 LT	210	void __init setup_arch(char **cmdline_p)
	211	{
	212	int i;
	213	unsigned long highest_paddr;
	214
e405ae76	215	sparc_ttable = (struct tt_entry *) &trapbase;
1da177e4 LT	216
	217	/* Initialize PROM console and command line. */
	218	*cmdline_p = prom_getbootargs();
08e7ca11	219	strcpy(boot_command_line, *cmdline_p);
3fbe36d8	220	parse_early_param();
1da177e4	221
7671fa22 SR	222	boot_flags_init(*cmdline_p);
	223
	224	register_console(&prom_early_console);
	225
1da177e4 LT	226	/* Set sparc_cpu_model */
1da177e4 LT	227	sparc_cpu_model = sun_unknown;
b7afdb7e	228	if (!strcmp(&cputypval[0], "sun4 "))
365b50f0	229	sparc_cpu_model = sun4;
b7afdb7e	230	if (!strcmp(&cputypval[0], "sun4c"))
365b50f0	231	sparc_cpu_model = sun4c;
b7afdb7e	232	if (!strcmp(&cputypval[0], "sun4m"))
365b50f0	233	sparc_cpu_model = sun4m;
b7afdb7e	234	if (!strcmp(&cputypval[0], "sun4s"))
365b50f0	235	sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
b7afdb7e	236	if (!strcmp(&cputypval[0], "sun4d"))
365b50f0	237	sparc_cpu_model = sun4d;
b7afdb7e	238	if (!strcmp(&cputypval[0], "sun4e"))
365b50f0	239	sparc_cpu_model = sun4e;
b7afdb7e	240	if (!strcmp(&cputypval[0], "sun4u"))
365b50f0	241	sparc_cpu_model = sun4u;
b7afdb7e	242	if (!strncmp(&cputypval[0], "leon" , 4))
0fd7ef1f	243	sparc_cpu_model = sparc_leon;
1da177e4	244
1da177e4 LT	245	printk("ARCH: ");
	246	switch(sparc_cpu_model) {
	247	case sun4:
	248	printk("SUN4\n");
	249	break;
	250	case sun4c:
	251	printk("SUN4C\n");
	252	break;
	253	case sun4m:
	254	printk("SUN4M\n");
	255	break;
	256	case sun4d:
	257	printk("SUN4D\n");
	258	break;
	259	case sun4e:
	260	printk("SUN4E\n");
	261	break;
	262	case sun4u:
	263	printk("SUN4U\n");
	264	break;
0fd7ef1f KE	265	case sparc_leon:
	266	printk("LEON\n");
	267	break;
1da177e4 LT	268	default:
	269	printk("UNKNOWN!\n");
	270	break;
6cb79b3f	271	}
1da177e4 LT	272
	273	#ifdef CONFIG_DUMMY_CONSOLE
	274	conswitchp = &dummy_con;
1da177e4	275	#endif
1da177e4 LT	276
1da177e4 LT	277	idprom_init();
5110bd21	278	if (ARCH_SUN4C)
1da177e4 LT	279	sun4c_probe_vac();
1da177e4 LT	280	load_mmu();
1da177e4 LT	281
	282	phys_base = 0xffffffffUL;
	283	highest_paddr = 0UL;
	284	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	285	unsigned long top;
	286
	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)
	292	highest_paddr = top;
	293	}
	294	pfn_base = phys_base >> PAGE_SHIFT;
	295
	296	if (!root_flags)
	297	root_mountflags &= ~MS_RDONLY;
	298	ROOT_DEV = old_decode_dev(root_dev);
5d2170ad	299	#ifdef CONFIG_BLK_DEV_RAM
1da177e4 LT	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);
	303	#endif
	304
	305	prom_setsync(prom_sync_me);
	306
	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))();
	311	}
	312
	313	init_mm.context = (unsigned long) NO_CONTEXT;
	314	init_task.thread.kregs = &fake_swapper_regs;
	315
	316	paging_init();
a23b423e KH	317
a23b423e KH	318	smp_setup_cpu_possible_map();
1da177e4 LT	319	}
1da177e4 LT	320
1da177e4 LT	321	extern int stop_a_enabled;
	322
	323	void sun_do_break(void)
	324	{
	325	if (!stop_a_enabled)
	326	return;
	327
	328	printk("\n");
	329	flush_user_windows();
	330
	331	prom_cmdline();
	332	}
6943f3da	333	EXPORT_SYMBOL(sun_do_break);
1da177e4	334
1da177e4	335	int stop_a_enabled = 1;
a8cbdcea BB	336
	337	static int __init topology_init(void)
	338	{
	339	int i, ncpus, err;
	340
	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
	344	*/
	345	ncpus = 0;
	346	while (!cpu_find_by_instance(ncpus, NULL, NULL))
	347	ncpus++;
	348	ncpus_probed = ncpus;
	349
	350	err = 0;
	351	for_each_online_cpu(i) {
	352	struct cpu p = kzalloc(sizeof(p), GFP_KERNEL);
	353	if (!p)
	354	err = -ENOMEM;
	355	else
94583779	356	register_cpu(p, i);
a8cbdcea BB	357	}
	358
	359	return err;
	360	}
	361
	362	subsys_initcall(topology_init);