[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 <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':
		/* Just ignore, this behavior is now the default.  */
		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>
1da177e4	34
1da177e4 LT	35	#include <asm/system.h>
	36	#include <asm/io.h>
	37	#include <asm/processor.h>
	38	#include <asm/oplib.h>
	39	#include <asm/page.h>
	40	#include <asm/pgtable.h>
	41	#include <asm/traps.h>
	42	#include <asm/vaddrs.h>
1da177e4 LT	43	#include <asm/mbus.h>
	44	#include <asm/idprom.h>
	45	#include <asm/machines.h>
	46	#include <asm/cpudata.h>
	47	#include <asm/setup.h>
	48
53ae3419 SR	49	#include "kernel.h"
53ae3419 SR	50
1da177e4 LT	51	struct screen_info screen_info = {
	52	0, 0, /* orig-x, orig-y */
	53	0, /* unused */
	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 */
	61	};
	62
	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.
	67	*/
	68
	69	extern unsigned long trapbase;
1da177e4 LT	70
1da177e4 LT	71	/* Pretty sick eh? */
c61c65cd	72	static void prom_sync_me(void)
1da177e4 LT	73	{
	74	unsigned long prom_tbr, flags;
	75
	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"
	80	"nop\n\t"
	81	"nop\n\t"
	82	"nop\n\t" : : "r" (&trapbase));
	83
1da177e4	84	prom_printf("PROM SYNC COMMAND...\n");
7bf02ea2	85	show_free_areas(0);
1da177e4 LT	86	if(current->pid != 0) {
	87	local_irq_enable();
	88	sys_sync();
	89	local_irq_disable();
	90	}
	91	prom_printf("Returning to prom\n");
	92
	93	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
	94	"nop\n\t"
	95	"nop\n\t"
	96	"nop\n\t" : : "r" (prom_tbr));
	97	local_irq_restore(flags);
1da177e4 LT	98	}
1da177e4 LT	99
c61c65cd	100	static unsigned int boot_flags __initdata = 0;
1da177e4	101	#define BOOTME_DEBUG 0x1
1da177e4 LT	102
	103	/* Exported for mm/init.c:paging_init. */
	104	unsigned long cmdline_memory_size __initdata = 0;
	105
5fcafb7a DH	106	/* which CPU booted us (0xff = not set) */
	107	unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
	108	unsigned char boot_cpu_id4; /* boot_cpu_id << 2 */
	109
1da177e4 LT	110	static void
	111	prom_console_write(struct console con, const char s, unsigned n)
	112	{
	113	prom_write(s, n);
	114	}
	115
7671fa22 SR	116	static struct console prom_early_console = {
7671fa22 SR	117	.name = "earlyprom",
1da177e4	118	.write = prom_console_write,
7671fa22	119	.flags = CON_PRINTBUFFER \| CON_BOOT,
1da177e4 LT	120	.index = -1,
	121	};
	122
1da177e4 LT	123	/*
	124	* Process kernel command line switches that are specific to the
	125	* SPARC or that require special low-level processing.
	126	*/
	127	static void __init process_switch(char c)
	128	{
	129	switch (c) {
	130	case 'd':
	131	boot_flags \|= BOOTME_DEBUG;
	132	break;
	133	case 's':
1da177e4 LT	134	break;
	135	case 'h':
	136	prom_printf("boot_flags_init: Halt!\n");
	137	prom_halt();
	138	break;
	139	case 'p':
7671fa22	140	/* Just ignore, this behavior is now the default. */
1da177e4 LT	141	break;
	142	default:
	143	printk("Unknown boot switch (-%c)\n", c);
	144	break;
	145	}
	146	}
	147
1da177e4 LT	148	static void __init boot_flags_init(char *commands)
	149	{
	150	while (*commands) {
	151	/* Move to the start of the next "argument". */
	152	while (commands && commands == ' ')
	153	commands++;
	154
	155	/* Process any command switches, otherwise skip it. */
	156	if (*commands == '\0')
	157	break;
	158	if (*commands == '-') {
	159	commands++;
	160	while (commands && commands != ' ')
	161	process_switch(*commands++);
	162	continue;
	163	}
c73fcc84	164	if (!strncmp(commands, "mem=", 4)) {
1da177e4 LT	165	/*
	166	* "mem=XXX[kKmM] overrides the PROM-reported
	167	* memory size.
	168	*/
	169	cmdline_memory_size = simple_strtoul(commands + 4,
	170	&commands, 0);
	171	if (commands == 'K' \|\| commands == 'k') {
	172	cmdline_memory_size <<= 10;
	173	commands++;
	174	} else if (commands=='M' \|\| commands=='m') {
	175	cmdline_memory_size <<= 20;
	176	commands++;
	177	}
	178	}
	179	while (commands && commands != ' ')
	180	commands++;
	181	}
	182	}
	183
	184	/* This routine will in the future do all the nasty prom stuff
	185	* to probe for the mmu type and its parameters, etc. This will
9f2b2a5f	186	* also be where SMP things happen.
1da177e4 LT	187	*/
1da177e4 LT	188
1da177e4	189	extern void sun4c_probe_vac(void);
1da177e4 LT	190
	191	extern unsigned short root_flags;
	192	extern unsigned short root_dev;
	193	extern unsigned short ram_flags;
	194	#define RAMDISK_IMAGE_START_MASK 0x07FF
	195	#define RAMDISK_PROMPT_FLAG 0x8000
	196	#define RAMDISK_LOAD_FLAG 0x4000
	197
	198	extern int root_mountflags;
	199
	200	char reboot_command[COMMAND_LINE_SIZE];
6943f3da	201
1da177e4	202	enum sparc_cpu sparc_cpu_model;
6943f3da	203	EXPORT_SYMBOL(sparc_cpu_model);
1da177e4 LT	204
	205	struct tt_entry *sparc_ttable;
	206
	207	struct pt_regs fake_swapper_regs;
	208
1da177e4 LT	209	void __init setup_arch(char **cmdline_p)
	210	{
	211	int i;
	212	unsigned long highest_paddr;
	213
e405ae76	214	sparc_ttable = (struct tt_entry *) &trapbase;
1da177e4 LT	215
	216	/* Initialize PROM console and command line. */
	217	*cmdline_p = prom_getbootargs();
08e7ca11	218	strcpy(boot_command_line, *cmdline_p);
3fbe36d8	219	parse_early_param();
1da177e4	220
7671fa22 SR	221	boot_flags_init(*cmdline_p);
	222
	223	register_console(&prom_early_console);
	224
1da177e4 LT	225	/* Set sparc_cpu_model */
1da177e4 LT	226	sparc_cpu_model = sun_unknown;
b7afdb7e	227	if (!strcmp(&cputypval[0], "sun4 "))
365b50f0	228	sparc_cpu_model = sun4;
b7afdb7e	229	if (!strcmp(&cputypval[0], "sun4c"))
365b50f0	230	sparc_cpu_model = sun4c;
b7afdb7e	231	if (!strcmp(&cputypval[0], "sun4m"))
365b50f0	232	sparc_cpu_model = sun4m;
b7afdb7e	233	if (!strcmp(&cputypval[0], "sun4s"))
365b50f0	234	sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
b7afdb7e	235	if (!strcmp(&cputypval[0], "sun4d"))
365b50f0	236	sparc_cpu_model = sun4d;
b7afdb7e	237	if (!strcmp(&cputypval[0], "sun4e"))
365b50f0	238	sparc_cpu_model = sun4e;
b7afdb7e	239	if (!strcmp(&cputypval[0], "sun4u"))
365b50f0	240	sparc_cpu_model = sun4u;
b7afdb7e	241	if (!strncmp(&cputypval[0], "leon" , 4))
0fd7ef1f	242	sparc_cpu_model = sparc_leon;
1da177e4	243
1da177e4 LT	244	printk("ARCH: ");
	245	switch(sparc_cpu_model) {
	246	case sun4:
	247	printk("SUN4\n");
	248	break;
	249	case sun4c:
	250	printk("SUN4C\n");
	251	break;
	252	case sun4m:
	253	printk("SUN4M\n");
	254	break;
	255	case sun4d:
	256	printk("SUN4D\n");
	257	break;
	258	case sun4e:
	259	printk("SUN4E\n");
	260	break;
	261	case sun4u:
	262	printk("SUN4U\n");
	263	break;
0fd7ef1f KE	264	case sparc_leon:
	265	printk("LEON\n");
	266	break;
1da177e4 LT	267	default:
	268	printk("UNKNOWN!\n");
	269	break;
6cb79b3f	270	}
1da177e4 LT	271
	272	#ifdef CONFIG_DUMMY_CONSOLE
	273	conswitchp = &dummy_con;
1da177e4	274	#endif
1da177e4 LT	275
1da177e4 LT	276	idprom_init();
5110bd21	277	if (ARCH_SUN4C)
1da177e4 LT	278	sun4c_probe_vac();
1da177e4 LT	279	load_mmu();
1da177e4 LT	280
	281	phys_base = 0xffffffffUL;
	282	highest_paddr = 0UL;
	283	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	284	unsigned long top;
	285
	286	if (sp_banks[i].base_addr < phys_base)
	287	phys_base = sp_banks[i].base_addr;
	288	top = sp_banks[i].base_addr +
	289	sp_banks[i].num_bytes;
	290	if (highest_paddr < top)
	291	highest_paddr = top;
	292	}
	293	pfn_base = phys_base >> PAGE_SHIFT;
	294
	295	if (!root_flags)
	296	root_mountflags &= ~MS_RDONLY;
	297	ROOT_DEV = old_decode_dev(root_dev);
5d2170ad	298	#ifdef CONFIG_BLK_DEV_RAM
1da177e4 LT	299	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
	300	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
	301	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
	302	#endif
	303
	304	prom_setsync(prom_sync_me);
	305
	306	if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
	307	(((short )linux_dbvec) != -1)) {
	308	printk("Booted under KADB. Syncing trap table.\n");
	309	(*(linux_dbvec->teach_debugger))();
	310	}
	311
	312	init_mm.context = (unsigned long) NO_CONTEXT;
	313	init_task.thread.kregs = &fake_swapper_regs;
	314
	315	paging_init();
a23b423e KH	316
a23b423e KH	317	smp_setup_cpu_possible_map();
1da177e4 LT	318	}
1da177e4 LT	319
1da177e4 LT	320	extern int stop_a_enabled;
	321
	322	void sun_do_break(void)
	323	{
	324	if (!stop_a_enabled)
	325	return;
	326
	327	printk("\n");
	328	flush_user_windows();
	329
	330	prom_cmdline();
	331	}
6943f3da	332	EXPORT_SYMBOL(sun_do_break);
1da177e4	333
1da177e4	334	int stop_a_enabled = 1;
a8cbdcea BB	335
	336	static int __init topology_init(void)
	337	{
	338	int i, ncpus, err;
	339
	340	/* Count the number of physically present processors in
	341	* the machine, even on uniprocessor, so that /proc/cpuinfo
	342	* output is consistent with 2.4.x
	343	*/
	344	ncpus = 0;
	345	while (!cpu_find_by_instance(ncpus, NULL, NULL))
	346	ncpus++;
	347	ncpus_probed = ncpus;
	348
	349	err = 0;
	350	for_each_online_cpu(i) {
	351	struct cpu p = kzalloc(sizeof(p), GFP_KERNEL);
	352	if (!p)
	353	err = -ENOMEM;
	354	else
94583779	355	register_cpu(p, i);
a8cbdcea BB	356	}
	357
	358	return err;
	359	}
	360
	361	subsys_initcall(topology_init);