setup.c

该文件是rt_linux

	}

	/* prom_init has already been called from __start */
	if (boot_infos)
		relocate_nodes();

	/* If we aren't PReP, we can find out if we're Pmac
	 * or CHRP with this. */
	if (_machine == 0)
		intuit_machine_type();

	/* finish_device_tree may need _machine defined. */
	finish_device_tree();

	/*
	 * If we were booted via quik, r3 points to the physical
	 * address of the command-line parameters.
	 * If we were booted from an xcoff image (i.e. netbooted or
	 * booted from floppy), we get the command line from the
	 * bootargs property of the /chosen node.
	 * If an initial ramdisk is present, r3 and r4
	 * are used for initrd_start and initrd_size,
	 * otherwise they contain 0xdeadbeef.  
	 */
	if (r3 >= 0x4000 && r3 < 0x800000 && r4 == 0) {
		cmd_line[0] = 0;
		strncpy(cmd_line, (char *)r3 + KERNELBASE,
			sizeof(cmd_line));
	} else if (boot_infos != 0) {
		/* booted by BootX - check for ramdisk */
		if (boot_infos->kernelParamsOffset != 0)
			strncpy(cmd_line, (char *) boot_infos
				+ boot_infos->kernelParamsOffset,
				sizeof(cmd_line));
#ifdef CONFIG_BLK_DEV_INITRD
		if (boot_infos->ramDisk) {
			initrd_start = (unsigned long) boot_infos
				+ boot_infos->ramDisk;
			initrd_end = initrd_start + boot_infos->ramDiskSize;
			initrd_below_start_ok = 1;
		}
#endif
	} else {
		struct device_node *chosen;
		char *p;
			
#ifdef CONFIG_BLK_DEV_INITRD
		if (r3 && r4 && r4 != 0xdeadbeef) {
			if (r3 < KERNELBASE)
				r3 += KERNELBASE;
			initrd_start = r3;
			initrd_end = r3 + r4;
			ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
			initrd_below_start_ok = 1;
		}
#endif
		chosen = find_devices("chosen");
		if (chosen != NULL) {
			p = get_property(chosen, "bootargs", NULL);
			if (p && *p) {
				cmd_line[0] = 0;
				strncpy(cmd_line, p, sizeof(cmd_line));
			}
		}
	}
	cmd_line[sizeof(cmd_line) - 1] = 0;

	switch (_machine) {
	case _MACH_Pmac:
		pmac_init(r3, r4, r5, r6, r7);
		break;
	case _MACH_chrp:
		chrp_init(r3, r4, r5, r6, r7);
		break;
	}
}
#endif /* CONFIG_ALL_PPC */

#ifndef CONFIG_APUS
struct bi_record *find_bootinfo(void)
{
	struct bi_record *rec;
	extern char __bss_start[];

	rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
	if ( rec->tag != BI_FIRST ) {
		/*
		 * This 0x10000 offset is a terrible hack but it will go away when
		 * we have the bootloader handle all the relocation and
		 * prom calls -- Cort
		 */
		rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
		if ( rec->tag != BI_FIRST )
			return NULL;
	}
	return rec;
}

void parse_bootinfo(struct bi_record *rec)
{
	if (rec == NULL || rec->tag != BI_FIRST)
		return;
	while (rec->tag != BI_LAST) {
		ulong *data = rec->data;
		switch (rec->tag) {
		case BI_CMD_LINE:
			memcpy(cmd_line, (void *)data, rec->size - 
					sizeof(struct bi_record));
			break;
		case BI_SYSMAP:
			sysmap = (char *)((data[0] >= (KERNELBASE)) ? data[0] :
					  (data[0]+KERNELBASE));
			sysmap_size = data[1];
			break;
#ifdef CONFIG_BLK_DEV_INITRD
		case BI_INITRD:
			initrd_start = data[0] + KERNELBASE;
			initrd_end = data[0] + data[1] + KERNELBASE;
			break;
#endif /* CONFIG_BLK_DEV_INITRD */
#ifdef CONFIG_ALL_PPC
		case BI_MACHTYPE:
			_machine = data[0];
			break;
#endif /* CONFIG_ALL_PPC */
		case BI_MEMSIZE:
			boot_mem_size = data[0];
			break;
		}
		rec = (struct bi_record *)((ulong)rec + rec->size);
	}
}
#endif /* CONFIG_APUS */

/*
 * Find out what kind of machine we're on and save any data we need
 * from the early boot process (devtree is copied on pmac by prom_init()).
 * This is called very early on the boot process, after a minimal
 * MMU environment has been set up but before MMU_init is called.
 */
void __init
machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
	     unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_CMDLINE
	strcpy(cmd_line, CONFIG_CMDLINE);
#endif /* CONFIG_CMDLINE */

	platform_init(r3, r4, r5, r6, r7);

	if (ppc_md.progress)
		ppc_md.progress("id mach(): done", 0x200);
}

/* Checks "l2cr=xxxx" command-line option */
int __init ppc_setup_l2cr(char *str)
{
	if (cur_cpu_spec[0]->cpu_features & CPU_FTR_L2CR) {
		unsigned long val = simple_strtoul(str, NULL, 0);
		printk(KERN_INFO "l2cr set to %lx\n", val);
                _set_L2CR(0);           /* force invalidate by disable cache */
                _set_L2CR(val);         /* and enable it */
	}
	return 1;
}
__setup("l2cr=", ppc_setup_l2cr);

void __init arch_discover_root(void)
{
	if (ppc_md.discover_root != NULL)
		ppc_md.discover_root();
}

void __init ppc_init(void)
{
	/* clear the progress line */
	if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
	
	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
}

/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
	extern int panic_timeout;
	extern char _etext[], _edata[];
	extern char *klimit;
	extern void do_init_bootmem(void);

	/* so udelay does something sensible, assume <= 1000 bogomips */
	loops_per_jiffy = 500000000 / HZ;

#ifdef CONFIG_ALL_PPC
	/* This could be called "early setup arch", it must be done
	 * now because xmon need it
	 */
	if (_machine == _MACH_Pmac)
		pmac_feature_init();	/* New cool way */
#endif /* CONFIG_ALL_PPC */

#ifdef CONFIG_XMON
	xmon_map_scc();
	if (strstr(cmd_line, "xmon"))
		xmon(0);
#endif /* CONFIG_XMON */
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);

#if defined(CONFIG_KGDB)
	kgdb_map_scc();
	set_debug_traps();
	breakpoint();
#endif

	/*
	 * Set cache line size based on type of cpu as a default.
	 * Systems with OF can look in the properties on the cpu node(s)
	 * for a possibly more accurate value.
	 */
	if (cur_cpu_spec[0]->cpu_features & CPU_FTR_SPLIT_ID_CACHE) {
		dcache_bsize = cur_cpu_spec[0]->dcache_bsize;
		icache_bsize = cur_cpu_spec[0]->icache_bsize;
		ucache_bsize = 0;
	} else
		ucache_bsize = dcache_bsize = icache_bsize
			= cur_cpu_spec[0]->dcache_bsize;

	/* reboot on panic */
	panic_timeout = 180;

	init_mm.start_code = PAGE_OFFSET;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) klimit;
	
	/* Save unparsed command line copy for /proc/cmdline */
	strcpy(saved_command_line, cmd_line);
	*cmdline_p = cmd_line;

	/* set up the bootmem stuff with available memory */
	do_init_bootmem();
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);

	ppc_md.setup_arch();
	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);

	paging_init();
	sort_exception_table();

	/* this is for modules since _machine can be a define -- Cort */
	ppc_md.ppc_machine = _machine;
}

#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) \
	|| defined(CONFIG_USB_STORAGE) || defined(CONFIG_USB_STORAGE_MODULE)
/* Convert the shorts/longs in hd_driveid from little to big endian;
 * chars are endian independant, of course, but strings need to be flipped.
 * (Despite what it says in drivers/block/ide.h, they come up as little
 * endian...)
 *
 * Changes to linux/hdreg.h may require changes here. */
void ppc_generic_ide_fix_driveid(struct hd_driveid *id)
{
        int i;
	unsigned short *stringcast;

	id->config         = __le16_to_cpu(id->config);
	id->cyls           = __le16_to_cpu(id->cyls);
	id->reserved2      = __le16_to_cpu(id->reserved2);
	id->heads          = __le16_to_cpu(id->heads);
	id->track_bytes    = __le16_to_cpu(id->track_bytes);
	id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
	id->sectors        = __le16_to_cpu(id->sectors);
	id->vendor0        = __le16_to_cpu(id->vendor0);
	id->vendor1        = __le16_to_cpu(id->vendor1);
	id->vendor2        = __le16_to_cpu(id->vendor2);
	stringcast = (unsigned short *)&id->serial_no[0];
	for (i = 0; i < (20/2); i++)
	        stringcast[i] = __le16_to_cpu(stringcast[i]);
	id->buf_type       = __le16_to_cpu(id->buf_type);
	id->buf_size       = __le16_to_cpu(id->buf_size);
	id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
	stringcast = (unsigned short *)&id->fw_rev[0];
	for (i = 0; i < (8/2); i++)
	        stringcast[i] = __le16_to_cpu(stringcast[i]);
	stringcast = (unsigned short *)&id->model[0];
	for (i = 0; i < (40/2); i++)
	        stringcast[i] = __le16_to_cpu(stringcast[i]);
	id->dword_io       = __le16_to_cpu(id->dword_io);
	id->reserved50     = __le16_to_cpu(id->reserved50);
	id->field_valid    = __le16_to_cpu(id->field_valid);
	id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
	id->cur_heads      = __le16_to_cpu(id->cur_heads);
	id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
	id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
	id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
	id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
	id->dma_1word      = __le16_to_cpu(id->dma_1word);
	id->dma_mword      = __le16_to_cpu(id->dma_mword);
	id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
	id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
	id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
	id->eide_pio       = __le16_to_cpu(id->eide_pio);
	id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
	for (i = 0; i < 2; i++)
		id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
        for (i = 0; i < 4; i++)
                id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
	id->queue_depth	   = __le16_to_cpu(id->queue_depth);
	for (i = 0; i < 4; i++)
		id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
	id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
	id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
	id->command_set_1  = __le16_to_cpu(id->command_set_1);
	id->command_set_2  = __le16_to_cpu(id->command_set_2);
	id->cfsse          = __le16_to_cpu(id->cfsse);
	id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
	id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
	id->csf_default    = __le16_to_cpu(id->csf_default);
	id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
	id->word89         = __le16_to_cpu(id->word89);
	id->word90         = __le16_to_cpu(id->word90);
	id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
	id->word92         = __le16_to_cpu(id->word92);
	id->hw_config      = __le16_to_cpu(id->hw_config);
	id->acoustic       = __le16_to_cpu(id->acoustic);
	for (i = 0; i < 5; i++)
		id->words95_99[i]  = __le16_to_cpu(id->words95_99[i]);
	id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
	for (i = 0; i < 22; i++)
		id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
	id->last_lun       = __le16_to_cpu(id->last_lun);
	id->word127        = __le16_to_cpu(id->word127);
	id->dlf            = __le16_to_cpu(id->dlf);
	id->csfo           = __le16_to_cpu(id->csfo);
	for (i = 0; i < 26; i++)
		id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
	id->word156        = __le16_to_cpu(id->word156);
	for (i = 0; i < 3; i++)
		id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
	id->cfa_power      = __le16_to_cpu(id->cfa_power);
	for (i = 0; i < 14; i++)
		id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
	for (i = 0; i < 31; i++)
		id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
	for (i = 0; i < 48; i++)
		id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
	id->integrity_word  = __le16_to_cpu(id->integrity_word);
}
#endif