path: root/arch/arm/kernel/setup.c

/*
 *  linux/arch/arm/kernel/setup.c
 *
 *  Copyright (C) 1995, 1996, 1997 Russell King
 */

/*
 * This file obtains various parameters about the system that the kernel
 * is running on.
 */

#include <linux/config.h>
#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/malloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/major.h>
#include <linux/utsname.h>
#include <linux/blk.h>
#include <linux/init.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/procinfo.h>
#include <asm/segment.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/arch/mmu.h>

struct drive_info_struct { char dummy[32]; } drive_info;
struct screen_info screen_info;
struct processor processor;
unsigned char aux_device_present;

extern const struct processor arm2_processor_functions;
extern const struct processor arm250_processor_functions;
extern const struct processor arm3_processor_functions;
extern const struct processor arm6_processor_functions;
extern const struct processor arm7_processor_functions;
extern const struct processor sa110_processor_functions;

struct armversions armidlist[] = {
#if defined(CONFIG_CPU_ARM2) || defined(CONFIG_CPU_ARM3)
	{ 0x41560200, 0xfffffff0, F_MEMC	, "ARM/VLSI",	"arm2"		, &arm2_processor_functions   },
	{ 0x41560250, 0xfffffff0, F_MEMC	, "ARM/VLSI",	"arm250"	, &arm250_processor_functions },
	{ 0x41560300, 0xfffffff0, F_MEMC|F_CACHE, "ARM/VLSI",	"arm3"		, &arm3_processor_functions   },
#endif
#if defined(CONFIG_CPU_ARM6) || defined(CONFIG_CPU_SA110)
	{ 0x41560600, 0xfffffff0, F_MMU|F_32BIT	, "ARM/VLSI",	"arm6"		, &arm6_processor_functions   },
	{ 0x41560610, 0xfffffff0, F_MMU|F_32BIT	, "ARM/VLSI",	"arm610"	, &arm6_processor_functions   },
	{ 0x41007000, 0xffffff00, F_MMU|F_32BIT , "ARM/VLSI",   "arm7"		, &arm7_processor_functions   },
	{ 0x41007100, 0xffffff00, F_MMU|F_32BIT , "ARM/VLSI",   "arm710"	, &arm7_processor_functions   },
	{ 0x4401a100, 0xfffffff0, F_MMU|F_32BIT	, "DEC",	"sa110"		, &sa110_processor_functions  },
#endif
	{ 0x00000000, 0x00000000, 0		, "***",	"*unknown*"	, NULL }
};

static struct param_struct *params = (struct param_struct *)PARAMS_BASE;

unsigned long arm_id;
unsigned int vram_half_sam;
int armidindex;
int ioebpresent;
int memc_ctrl_reg;
int number_ide_drives;
int number_mfm_drives;

extern int bytes_per_char_h;
extern int bytes_per_char_v;
extern int root_mountflags;
extern int _etext, _edata, _end;
extern unsigned long real_end_mem;

/*-------------------------------------------------------------------------
 * Early initialisation routines for various configurable items in the
 * kernel.  Each one either supplies a setup_ function, or defines this
 * symbol to be empty if not configured.
 */

/*
 * Risc-PC specific initialisation
 */
#ifdef CONFIG_ARCH_RPC

extern void init_dram_banks(struct param_struct *params);

static void setup_rpc (struct param_struct *params)
{
	init_dram_banks(params);

	switch (params->u1.s.pages_in_vram) {
	case 256:
		vram_half_sam = 1024;
		break;
	case 512:
	default:
		vram_half_sam = 2048;
	}

	/*
	 * Set ROM speed to maximum
	 */
	outb (0x1d, IOMD_ROMCR0);
}
#else
#define setup_rpc(x)
#endif

/*
 * ram disk
 */
#ifdef CONFIG_BLK_DEV_RAM
extern int rd_doload;		/* 1 = load ramdisk, 0 = don't load */
extern int rd_prompt;		/* 1 = prompt for ramdisk, 0 = don't prompt */
extern int rd_image_start;	/* starting block # of image */

static void setup_ramdisk (struct param_struct *params)
{
    rd_image_start	= params->u1.s.rd_start;
    rd_prompt		= (params->u1.s.flags & FLAG_RDPROMPT) == 0;
    rd_doload		= (params->u1.s.flags & FLAG_RDLOAD) == 0;
}
#else
#define setup_ramdisk(p)
#endif

/*
 * initial ram disk
 */
#ifdef CONFIG_BLK_DEV_INITRD
static void setup_initrd (struct param_struct *params, unsigned long memory_end)
{
    initrd_start = params->u1.s.initrd_start;
    initrd_end   = params->u1.s.initrd_start + params->u1.s.initrd_size;

    if (initrd_end > memory_end) {
	printk ("initrd extends beyond end of memory "
		"(0x%08lx > 0x%08lx) - disabling initrd\n",
		initrd_end, memory_end);
	initrd_start = 0;
    }
}
#else
#define setup_initrd(p,m)
#endif

#ifdef IOEB_BASE
static inline void check_ioeb_present(void)
{
	if (((*IOEB_BASE) & 15) == 5)
		armidlist[armidindex].features |= F_IOEB;
}
#else
#define check_ioeb_present()
#endif

static inline void get_processor_type (void)
{
	for (armidindex = 0; ; armidindex ++)
		if (!((armidlist[armidindex].id ^ arm_id) &
		      armidlist[armidindex].mask))
			break;

	if (armidlist[armidindex].id == 0) {
		int i;

		for (i = 0; i < 3200; i++)
			((unsigned long *)SCREEN2_BASE)[i] = 0x77113322;

		while (1);
	}
	processor = *armidlist[armidindex].proc;
}

#define COMMAND_LINE_SIZE 256

/* Can this be initdata?  --pb
 *  command_line can be, saved_command_line can't though
 */
static char command_line[COMMAND_LINE_SIZE] = { 0, };
       char saved_command_line[COMMAND_LINE_SIZE];

__initfunc(void setup_arch(char **cmdline_p,
	unsigned long * memory_start_p, unsigned long * memory_end_p))
{
	static unsigned char smptrap;
	unsigned long memory_start, memory_end;
	char c = ' ', *to = command_line, *from;
	int len = 0;

	if (smptrap == 1)
		return;
	smptrap = 1;

	get_processor_type ();
	check_ioeb_present ();
	processor._proc_init ();

	bytes_per_char_h  = params->u1.s.bytes_per_char_h;
	bytes_per_char_v  = params->u1.s.bytes_per_char_v;
	from		  = params->commandline;
	ROOT_DEV	  = to_kdev_t (params->u1.s.rootdev);
	ORIG_X		  = params->u1.s.video_x;
	ORIG_Y		  = params->u1.s.video_y;
	ORIG_VIDEO_COLS	  = params->u1.s.video_num_cols;
	ORIG_VIDEO_LINES  = params->u1.s.video_num_rows;
	memc_ctrl_reg	  = params->u1.s.memc_control_reg;
	number_ide_drives = (params->u1.s.adfsdrives >> 6) & 3;
	number_mfm_drives = (params->u1.s.adfsdrives >> 3) & 3;

	setup_rpc (params);
	setup_ramdisk (params);

	if (!(params->u1.s.flags & FLAG_READONLY))
		root_mountflags &= ~MS_RDONLY;

	memory_start = MAPTOPHYS((unsigned long)&_end);
	memory_end   = GET_MEMORY_END(params);

	init_task.mm->start_code = TASK_SIZE;
	init_task.mm->end_code	 = TASK_SIZE + (unsigned long) &_etext;
	init_task.mm->end_data	 = TASK_SIZE + (unsigned long) &_edata;
	init_task.mm->brk	 = TASK_SIZE + (unsigned long) &_end;

	/* Save unparsed command line copy for /proc/cmdline */
	memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';

	for (;;) {
		if (c == ' ' &&
		    from[0] == 'm' &&
		    from[1] == 'e' &&
		    from[2] == 'm' &&
		    from[3] == '=') {
			memory_end = simple_strtoul(from+4, &from, 0);
			if (*from == 'K' || *from == 'k') {
				memory_end = memory_end << 10;
				from++;
			} else if (*from == 'M' || *from == 'm') {
				memory_end = memory_end << 20;
				from++;
			}
			memory_end = memory_end + PAGE_OFFSET;
		}
		c = *from++;
		if (!c)
			break;
		if (COMMAND_LINE_SIZE <= ++len)
			break;
		*to++ = c;
	}

	*to = '\0';
	*cmdline_p = command_line;
	*memory_start_p = memory_start;
	*memory_end_p = memory_end;

	setup_initrd (params, memory_end);

	strcpy (system_utsname.machine, armidlist[armidindex].name);
}

#define ISSET(bit) (armidlist[armidindex].features & bit)

int get_cpuinfo(char * buffer)
{
	int len;

	len = sprintf (buffer,  "CPU:\n"
				"Type\t\t: %s\n"
				"Revision\t: %d\n"
				"Manufacturer\t: %s\n"
				"32bit modes\t: %s\n"
				"BogoMips\t: %lu.%02lu\n",
				armidlist[armidindex].name,
				(int)arm_id & 15,
				armidlist[armidindex].manu,
				ISSET (F_32BIT) ? "yes" : "no",
				(loops_per_sec+2500) / 500000,
				((loops_per_sec+2500) / 5000) % 100);
	len += sprintf (buffer + len,
				"\nHardware:\n"
				"Mem System\t: %s\n"
				"IOEB\t\t: %s\n",
				ISSET(F_MEMC)  ? "MEMC" : 
				ISSET(F_MMU)   ? "MMU"  : "*unknown*",
				ISSET(F_IOEB)  ? "present" : "absent"
				);
	return len;
}