setup.c

该文件是rt_linux

/*
 * BK Id: %F% %I% %G% %U% %#%
 */
/*
 * Common prep/pmac/chrp boot and setup code.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/blk.h>
#include <linux/ide.h>
#include <linux/tty.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>

#include <asm/residual.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <asm/amigappc.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pmac_feature.h>

extern void platform_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);
extern void bootx_init(unsigned long r4, unsigned long phys);
extern void identify_cpu(unsigned long offset, unsigned long cpu);
extern void do_cpu_ftr_fixups(unsigned long offset);
extern void reloc_got2(unsigned long offset);

#ifdef CONFIG_XMON
extern void xmon_map_scc(void);
#endif

extern boot_infos_t *boot_infos;
char saved_command_line[512];
extern char cmd_line[512];
unsigned char aux_device_present;
struct ide_machdep_calls ppc_ide_md;
char *sysmap;
unsigned long sysmap_size;

/* Used with the BI_MEMSIZE bootinfo parameter to store the memory
   size value reported by the boot loader. */ 
unsigned long boot_mem_size;

unsigned long ISA_DMA_THRESHOLD;
unsigned long DMA_MODE_READ, DMA_MODE_WRITE;

#ifdef CONFIG_ALL_PPC
int _machine = 0;

extern void prep_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);
extern void pmac_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);
extern void chrp_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);
#endif /* CONFIG_ALL_PPC */

#ifdef CONFIG_MAGIC_SYSRQ
unsigned long SYSRQ_KEY;
#endif /* CONFIG_MAGIC_SYSRQ */

#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
#endif

struct machdep_calls ppc_md;

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;

#ifdef CONFIG_VGA_CONSOLE
struct screen_info screen_info = {
	0, 25,			/* orig-x, orig-y */
	0,			/* unused */
	0,			/* orig-video-page */
	0,			/* orig-video-mode */
	80,			/* orig-video-cols */
	0,0,0,			/* ega_ax, ega_bx, ega_cx */
	25,			/* orig-video-lines */
	1,			/* orig-video-isVGA */
	16			/* orig-video-points */
};
#endif /* CONFIG_VGA_CONSOLE */

void machine_restart(char *cmd)
{
	ppc_md.restart(cmd);
}
  
void machine_power_off(void)
{
	ppc_md.power_off();
}
  
void machine_halt(void)
{
	ppc_md.halt();
}

#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

int show_cpuinfo(struct seq_file *m, void *v)
{
	int i = (int) v - 1;
	int err = 0;
	unsigned int pvr;
	unsigned short maj, min;
	unsigned long lpj;

	if (i >= NR_CPUS) {
		/* Show summary information */
#ifdef CONFIG_SMP
		unsigned long bogosum = 0;
		for (i = 0; i < smp_num_cpus; ++i)
			if (cpu_online_map & (1 << i))
				bogosum += cpu_data[i].loops_per_jiffy;
		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
			   bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP */

		if (ppc_md.show_cpuinfo != NULL)
			err = ppc_md.show_cpuinfo(m);
		return err;
	}

#ifdef CONFIG_SMP
	if (!(cpu_online_map & (1 << i)))
		return 0;
	pvr = cpu_data[i].pvr;
	lpj = cpu_data[i].loops_per_jiffy;
	seq_printf(m, "processor\t: %lu\n", i);
#else
	pvr = mfspr(PVR);
	lpj = loops_per_jiffy;
#endif

	seq_printf(m, "cpu\t\t: ");

	if (cur_cpu_spec[i]->pvr_mask)
		seq_printf(m, "%s", cur_cpu_spec[i]->cpu_name);
	else
		seq_printf(m, "unknown (%08x)", pvr);
#ifdef CONFIG_ALTIVEC
	if (cur_cpu_spec[i]->cpu_features & CPU_FTR_ALTIVEC)
		seq_printf(m, ", altivec supported");
#endif
	seq_printf(m, "\n");

#ifdef CONFIG_TAU
	if (cur_cpu_spec[i]->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
		/* more straightforward, but potentially misleading */
		seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
			   cpu_temp(i));
#else
		/* show the actual temp sensor range */
		u32 temp;
		temp = cpu_temp_both(i);
		seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
			   temp & 0xff, temp >> 16);
#endif
	}
#endif /* CONFIG_TAU */

	if (ppc_md.show_percpuinfo != NULL) {
		err = ppc_md.show_percpuinfo(m, i);
		if (err)
			return err;
	}

	switch (PVR_VER(pvr)) {
	case 0x0020:	/* 403 family */
		maj = PVR_MAJ(pvr) + 1;
		min = PVR_MIN(pvr);
		break;
	case 0x1008:	/* 740P/750P ?? */
		maj = ((pvr >> 8) & 0xFF) - 1;
		min = pvr & 0xFF;
		break;
	default:
		maj = (pvr >> 8) & 0xFF;
		min = pvr & 0xFF;
		break;
	}

	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 
		   maj, min, PVR_VER(pvr), PVR_REV(pvr));

	seq_printf(m, "bogomips\t: %lu.%02lu\n",
		   lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);

#ifdef CONFIG_SMP
	seq_printf(m, "\n");
#endif

	return 0;
}


static void *c_start(struct seq_file *m, loff_t *pos)
{
	int i = *pos;

	return i <= NR_CPUS? (void *) (i + 1): NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	start:	c_start,
	next:	c_next,
	stop:	c_stop,
	show:	show_cpuinfo,
};

/*
 * We're called here very early in the boot.  We determine the machine
 * type and call the appropriate low-level setup functions.
 *  -- Cort <[e-mail]>
 *
 * Note that the kernel may be running at an address which is different
 * from the address that it was linked at, so we must use RELOC/PTRRELOC
 * to access static data (including strings).  -- paulus
 */
__init
unsigned long
early_init(int r3, int r4, int r5)
{
	extern char __bss_start, _end;
 	unsigned long phys;
	unsigned long offset = reloc_offset();

 	/* Default */
 	phys = offset + KERNELBASE;

	/* First zero the BSS -- use memset, some arches don't have
	 * caches on yet */
	memset_io(PTRRELOC(&__bss_start), 0, &_end - &__bss_start);

	/*
	 * Identify the CPU type and fix up code sections
	 * that depend on which cpu we have.
	 */
	identify_cpu(offset, 0);
	do_cpu_ftr_fixups(offset);

#if defined(CONFIG_ALL_PPC)
	reloc_got2(offset);

	/* If we came here from BootX, clear the screen,
	 * set up some pointers and return. */
	if ((r3 == 0x426f6f58) && (r5 == 0))
		bootx_init(r4, phys);

	/*
	 * don't do anything on prep
	 * for now, don't use bootinfo because it breaks yaboot 0.5
	 * and assume that if we didn't find a magic number, we have OF
	 */
	else if (*(unsigned long *)(0) != 0xdeadc0de)
		phys = prom_init(r3, r4, (prom_entry)r5);

	reloc_got2(-offset);
#endif

	return phys;
}

#ifdef CONFIG_ALL_PPC
void __init
intuit_machine_type(void)
{
	char *model;
	struct device_node *root;
			
	/* ask the OF info if we're a chrp or pmac */
	root = find_path_device("/");
	if (root != 0) {
		/* assume pmac unless proven to be chrp -- Cort */
		_machine = _MACH_Pmac;
		model = get_property(root, "device_type", NULL);
		if (model && !strncmp("chrp", model, 4))
			_machine = _MACH_chrp;
		else {
			model = get_property(root, "model", NULL);
			if (model && !strncmp(model, "IBM", 3))
				_machine = _MACH_chrp;
		}
	}
}

/*
 * The ALL_PPC version of platform_init...
 */
void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	      unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_BOOTX_TEXT
	if (boot_text_mapped) {
		btext_clearscreen();
		btext_welcome();
	}
#endif	

	parse_bootinfo(find_bootinfo());

	/* if we didn't get any bootinfo telling us what we are... */
	if (_machine == 0) {
		/* prep boot loader tells us if we're prep or not */
		if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
			_machine = _MACH_prep;
	}

	/* not much more to do here, if prep */
	if (_machine == _MACH_prep) {
		prep_init(r3, r4, r5, r6, r7);
		return;