arch/powerpc/kernel/setup_32.c - maze/linux - Git at Google

 /*
  * 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/kernel.h>
 #include <linux/reboot.h>
 #include <linux/delay.h>
 #include <linux/initrd.h>
 #include <linux/ide.h>
 #include <linux/tty.h>
 #include <linux/bootmem.h>
 #include <linux/seq_file.h>
 #include <linux/root_dev.h>
 #include <linux/cpu.h>
 #include <linux/console.h>

 #include <asm/residual.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/processor.h>
 #include <asm/pgtable.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>
 #include <asm/sections.h>
 #include <asm/nvram.h>
 #include <asm/xmon.h>
 #include <asm/time.h>

 #define DBG(fmt...)

 #if defined CONFIG_KGDB
 #include <asm/kgdb.h>
 #endif

 extern void platform_init(void);
 extern void bootx_init(unsigned long r4, unsigned long phys);

 extern void ppc6xx_idle(void);
 extern void power4_idle(void);

 boot_infos_t *boot_infos;
 struct ide_machdep_calls ppc_ide_md;

 /* XXX should go elsewhere */
 int __irq_offset_value;
 EXPORT_SYMBOL(__irq_offset_value);

 int boot_cpuid;
 EXPORT_SYMBOL_GPL(boot_cpuid);
 int boot_cpuid_phys;

 unsigned long ISA_DMA_THRESHOLD;
 unsigned int DMA_MODE_READ;
 unsigned int DMA_MODE_WRITE;

 int have_of = 1;

 #ifdef CONFIG_PPC_MULTIPLATFORM
 int _machine = 0;

 extern void prep_init(void);
 extern void pmac_init(void);
 extern void chrp_init(void);

 dev_t boot_dev;
 #endif /* CONFIG_PPC_MULTIPLATFORM */

 #ifdef CONFIG_MAGIC_SYSRQ
 unsigned long SYSRQ_KEY = 0x54;
 #endif /* CONFIG_MAGIC_SYSRQ */

 #ifdef CONFIG_VGA_CONSOLE
 unsigned long vgacon_remap_base;
 #endif

 struct machdep_calls ppc_md;
 EXPORT_SYMBOL(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;

 /*
  * We're called here very early in the boot.  We determine the machine
  * type and call the appropriate low-level setup functions.
  *  -- Cort <cort@fsmlabs.com>
  *
  * 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
  */
 unsigned long __init early_init(unsigned long dt_ptr)
 {
 	unsigned long offset = reloc_offset();

 	/* First zero the BSS -- use memset_io, some platforms 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);

 	return KERNELBASE + offset;
 }

 #ifdef CONFIG_PPC_MULTIPLATFORM
 /*
  * The PPC_MULTIPLATFORM version of platform_init...
  */
 void __init platform_init(void)
 {
 	/* 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;
 	}

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

 #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();
 		break;
 #endif
 #ifdef CONFIG_PPC_CHRP
 	case _MACH_chrp:
 		chrp_init();
 		break;
 #endif
 	}
 }
 #endif

 /*
  * 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 dt_ptr, unsigned long phys)
 {
 	early_init_devtree(__va(dt_ptr));

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

 	platform_init();

 #ifdef CONFIG_6xx
 	ppc_md.power_save = ppc6xx_idle;
 #endif

 	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;

 	unflatten_device_tree();
 	check_for_initrd();
 	finish_device_tree();

 	smp_setup_cpu_maps();

 #ifdef CONFIG_BOOTX_TEXT
 	init_boot_display();
 #endif

 #ifdef CONFIG_PPC_PMAC
 	/* 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_map_scc();
 	if (strstr(cmd_line, "xmon")) {
 		xmon_init(1);
 		debugger(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;
 }
	/*
	* 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/kernel.h>
	#include <linux/reboot.h>
	#include <linux/delay.h>
	#include <linux/initrd.h>
	#include <linux/ide.h>
	#include <linux/tty.h>
	#include <linux/bootmem.h>
	#include <linux/seq_file.h>
	#include <linux/root_dev.h>
	#include <linux/cpu.h>
	#include <linux/console.h>

	#include <asm/residual.h>
	#include <asm/io.h>
	#include <asm/prom.h>
	#include <asm/processor.h>
	#include <asm/pgtable.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>
	#include <asm/sections.h>
	#include <asm/nvram.h>
	#include <asm/xmon.h>
	#include <asm/time.h>

	#define DBG(fmt...)

	#if defined CONFIG_KGDB
	#include <asm/kgdb.h>
	#endif

	extern void platform_init(void);
	extern void bootx_init(unsigned long r4, unsigned long phys);

	extern void ppc6xx_idle(void);
	extern void power4_idle(void);

	boot_infos_t *boot_infos;
	struct ide_machdep_calls ppc_ide_md;

	/* XXX should go elsewhere */
	int __irq_offset_value;
	EXPORT_SYMBOL(__irq_offset_value);

	int boot_cpuid;
	EXPORT_SYMBOL_GPL(boot_cpuid);
	int boot_cpuid_phys;

	unsigned long ISA_DMA_THRESHOLD;
	unsigned int DMA_MODE_READ;
	unsigned int DMA_MODE_WRITE;

	int have_of = 1;

	#ifdef CONFIG_PPC_MULTIPLATFORM
	int _machine = 0;

	extern void prep_init(void);
	extern void pmac_init(void);
	extern void chrp_init(void);

	dev_t boot_dev;
	#endif /* CONFIG_PPC_MULTIPLATFORM */

	#ifdef CONFIG_MAGIC_SYSRQ
	unsigned long SYSRQ_KEY = 0x54;
	#endif /* CONFIG_MAGIC_SYSRQ */

	#ifdef CONFIG_VGA_CONSOLE
	unsigned long vgacon_remap_base;
	#endif

	struct machdep_calls ppc_md;
	EXPORT_SYMBOL(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;

	/*
	* We're called here very early in the boot. We determine the machine
	* type and call the appropriate low-level setup functions.
	* -- Cort <cort@fsmlabs.com>
	*
	* 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
	*/
	unsigned long __init early_init(unsigned long dt_ptr)
	{
	unsigned long offset = reloc_offset();

	/* First zero the BSS -- use memset_io, some platforms 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);

	return KERNELBASE + offset;
	}

	#ifdef CONFIG_PPC_MULTIPLATFORM
	/*
	* The PPC_MULTIPLATFORM version of platform_init...
	*/
	void __init platform_init(void)
	{
	/* 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;
	}

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

	#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();
	break;
	#endif
	#ifdef CONFIG_PPC_CHRP
	case _MACH_chrp:
	chrp_init();
	break;
	#endif
	}
	}
	#endif

	/*
	* 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 dt_ptr, unsigned long phys)
	{
	early_init_devtree(__va(dt_ptr));

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

	platform_init();

	#ifdef CONFIG_6xx
	ppc_md.power_save = ppc6xx_idle;
	#endif

	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;

	unflatten_device_tree();
	check_for_initrd();
	finish_device_tree();

	smp_setup_cpu_maps();

	#ifdef CONFIG_BOOTX_TEXT
	init_boot_display();
	#endif

	#ifdef CONFIG_PPC_PMAC
	/* 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_map_scc();
	if (strstr(cmd_line, "xmon")) {
	xmon_init(1);
	debugger(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;
	}