setup.c

linux-2.6.15.6

	if (_machine == 0) {
		/* prep boot loader tells us if we're prep or not */
		if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
			_machine = _MACH_prep;
	}

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

	have_of = 1;

	/* 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) {
		strlcpy(cmd_line, (char *)r3 + KERNELBASE,
			sizeof(cmd_line));
	} else if (boot_infos != 0) {
		/* booted by BootX - check for ramdisk */
		if (boot_infos->kernelParamsOffset != 0)
			strlcpy(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 = Root_RAM0;
			initrd_below_start_ok = 1;
		}
#endif
		chosen = find_devices("chosen");
		if (chosen != NULL) {
			p = get_property(chosen, "bootargs", NULL);
			if (p && *p) {
				strlcpy(cmd_line, p, sizeof(cmd_line));
			}
		}
	}
#ifdef CONFIG_ADB
	if (strstr(cmd_line, "adb_sync")) {
		extern int __adb_probe_sync;
		__adb_probe_sync = 1;
	}
#endif /* CONFIG_ADB */

	switch (_machine) {
#ifdef CONFIG_PPC_PMAC
	case _MACH_Pmac:
		pmac_init(r3, r4, r5, r6, r7);
		break;
#endif
#ifdef CONFIG_PPC_CHRP
	case _MACH_chrp:
		chrp_init(r3, r4, r5, r6, r7);
		break;
#endif
	}
}

#ifdef CONFIG_SERIAL_CORE_CONSOLE
extern char *of_stdout_device;

static int __init set_preferred_console(void)
{
	struct device_node *prom_stdout;
	char *name;
	int offset = 0;

	if (of_stdout_device == NULL)
		return -ENODEV;

	/* The user has requested a console so this is already set up. */
	if (strstr(saved_command_line, "console="))
		return -EBUSY;

	prom_stdout = find_path_device(of_stdout_device);
	if (!prom_stdout)
		return -ENODEV;

	name = (char *)get_property(prom_stdout, "name", NULL);
	if (!name)
		return -ENODEV;

	if (strcmp(name, "serial") == 0) {
		int i;
		u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
		if (i > 8) {
			switch (reg[1]) {
				case 0x3f8:
					offset = 0;
					break;
				case 0x2f8:
					offset = 1;
					break;
				case 0x898:
					offset = 2;
					break;
				case 0x890:
					offset = 3;
					break;
				default:
					/* We dont recognise the serial port */
					return -ENODEV;
			}
		}
	} else if (strcmp(name, "ch-a") == 0)
		offset = 0;
	else if (strcmp(name, "ch-b") == 0)
		offset = 1;
	else
		return -ENODEV;
	return add_preferred_console("ttyS", offset, NULL);
}
console_initcall(set_preferred_console);
#endif /* CONFIG_SERIAL_CORE_CONSOLE */
#endif /* CONFIG_PPC_MULTIPLATFORM */

struct bi_record *find_bootinfo(void)
{
	struct bi_record *rec;

	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:
			strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
			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_PPC_MULTIPLATFORM
		case BI_MACHTYPE:
			/* Machine types changed with the merge. Since the
			 * bootinfo are now deprecated, we can just hard code
			 * the appropriate conversion here for when we are
			 * called with yaboot which passes us a machine type
			 * this way.
			 */
			switch(data[0]) {
			case 1: _machine = _MACH_prep; break;
			case 2: _machine = _MACH_Pmac; break;
			case 4: _machine = _MACH_chrp; break;
			default:
				_machine = data[0];
			}
			break;
#endif
		case BI_MEMSIZE:
			boot_mem_size = data[0];
			break;
		}
		rec = (struct bi_record *)((ulong)rec + rec->size);
	}
}

/*
 * 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
	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
#endif /* CONFIG_CMDLINE */

#ifdef CONFIG_6xx
	ppc_md.power_save = ppc6xx_idle;
#endif
#ifdef CONFIG_POWER4
	ppc_md.power_save = power4_idle;
#endif

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

	if (ppc_md.progress)
		ppc_md.progress("id mach(): done", 0x200);
}
#ifdef CONFIG_BOOKE_WDT
/* Checks wdt=x and wdt_period=xx command-line option */
int __init early_parse_wdt(char *p)
{
	if (p && strncmp(p, "0", 1) != 0)
	       booke_wdt_enabled = 1;

	return 0;
}
early_param("wdt", early_parse_wdt);

int __init early_parse_wdt_period (char *p)
{
	if (p)
		booke_wdt_period = simple_strtoul(p, NULL, 0);

	return 0;
}
early_param("wdt_period", early_parse_wdt_period);
#endif	/* CONFIG_BOOKE_WDT */

/* Checks "l2cr=xxxx" command-line option */
int __init ppc_setup_l2cr(char *str)
{
	if (cpu_has_feature(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);

#ifdef CONFIG_GENERIC_NVRAM

/* Generic nvram hooks used by drivers/char/gen_nvram.c */
unsigned char nvram_read_byte(int addr)
{
	if (ppc_md.nvram_read_val)
		return ppc_md.nvram_read_val(addr);
	return 0xff;
}
EXPORT_SYMBOL(nvram_read_byte);

void nvram_write_byte(unsigned char val, int addr)
{
	if (ppc_md.nvram_write_val)
		ppc_md.nvram_write_val(addr, val);
}
EXPORT_SYMBOL(nvram_write_byte);

void nvram_sync(void)
{
	if (ppc_md.nvram_sync)
		ppc_md.nvram_sync();
}
EXPORT_SYMBOL(nvram_sync);

#endif /* CONFIG_NVRAM */

static struct cpu cpu_devices[NR_CPUS];

int __init ppc_init(void)
{
	int i;

	/* clear the progress line */
	if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);

	/* register CPU devices */
	for (i = 0; i < NR_CPUS; i++)
		if (cpu_possible(i))
			register_cpu(&cpu_devices[i], i, NULL);

	/* call platform init */
	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
	return 0;
}

arch_initcall(ppc_init);

/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
	extern char *klimit;
	extern void do_init_bootmem(void);

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

#ifdef CONFIG_PPC_MULTIPLATFORM
	/* 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

#ifdef CONFIG_XMON
	xmon_init(1);
	if (strstr(cmd_line, "xmon"))
		xmon(NULL);
#endif /* CONFIG_XMON */
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);

#if defined(CONFIG_KGDB)
	if (ppc_md.kgdb_map_scc)
		ppc_md.kgdb_map_scc();
	set_debug_traps();
	if (strstr(cmd_line, "gdb")) {
		if (ppc_md.progress)
			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
		printk("kgdb breakpoint activated\n");
		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 (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
		dcache_bsize = cur_cpu_spec->dcache_bsize;
		icache_bsize = cur_cpu_spec->icache_bsize;
		ucache_bsize = 0;
	} else
		ucache_bsize = dcache_bsize = icache_bsize
			= cur_cpu_spec->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 */
	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;

	parse_early_param();

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

#ifdef CONFIG_PPC_OCP
	/* Initialize OCP device list */
	ocp_early_init();
	if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
#endif

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

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

	paging_init();

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