/* *  * Common boot and setup code. * * Copyright (C) 2001 PPC64 Team, IBM Corp * *      This program is free software; you can redistribute it and/or *      modify it under the terms of the GNU General Public License *      as published by the Free Software Foundation; either version *      2 of the License, or (at your option) any later version. */ #undef DEBUG #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/seq_file.h>#include <linux/ioport.h>#include <linux/console.h>#include <linux/utsname.h>#include <linux/tty.h>#include <linux/root_dev.h>#include <linux/notifier.h>#include <linux/cpu.h>#include <linux/unistd.h>#include <linux/serial.h>#include <linux/serial_8250.h>#include <linux/bootmem.h>#include <linux/pci.h>#include <asm/io.h>#include <asm/kdump.h>#include <asm/prom.h>#include <asm/processor.h>#include <asm/pgtable.h>#include <asm/smp.h>#include <asm/elf.h>#include <asm/machdep.h>#include <asm/paca.h>#include <asm/time.h>#include <asm/cputable.h>#include <asm/sections.h>#include <asm/btext.h>#include <asm/nvram.h>#include <asm/setup.h>#include <asm/system.h>#include <asm/rtas.h>#include <asm/iommu.h>#include <asm/serial.h>#include <asm/cache.h>#include <asm/page.h>#include <asm/mmu.h>#include <asm/lmb.h>#include <asm/firmware.h>#include <asm/xmon.h>#include <asm/udbg.h>#include <asm/kexec.h> #include "setup.h" #ifdef DEBUG#define DBG(fmt...) udbg_printf(fmt)#else#define DBG(fmt...)#endif int have_of = 1;int boot_cpuid = 0;u64 ppc64_pft_size; /* Pick defaults since we might want to patch instructions * before we've read this from the device tree. */struct ppc64_caches ppc64_caches = {	.dline_size = 0x40,	.log_dline_size = 6,	.iline_size = 0x40,	.log_iline_size = 6};EXPORT_SYMBOL_GPL(ppc64_caches); /* * 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_SMP static int smt_enabled_cmdline; /* Look for ibm,smt-enabled OF option */static void check_smt_enabled(void){	struct device_node *dn;	const char *smt_option; 	/* Allow the command line to overrule the OF option */	if (smt_enabled_cmdline)		return; 	dn = of_find_node_by_path("/options"); 	if (dn) {		smt_option = get_property(dn, "ibm,smt-enabled", NULL);                 if (smt_option) {			if (!strcmp(smt_option, "on"))				smt_enabled_at_boot = 1;			else if (!strcmp(smt_option, "off"))				smt_enabled_at_boot = 0;                }        }} /* Look for smt-enabled= cmdline option */static int __init early_smt_enabled(char *p){	smt_enabled_cmdline = 1; 	if (!p)		return 0; 	if (!strcmp(p, "on") || !strcmp(p, "1"))		smt_enabled_at_boot = 1;	else if (!strcmp(p, "off") || !strcmp(p, "0"))		smt_enabled_at_boot = 0; 	return 0;}early_param("smt-enabled", early_smt_enabled); #else#define check_smt_enabled()#endif /* CONFIG_SMP */ /* Put the paca pointer into r13 and SPRG3 */void __init setup_paca(int cpu){	local_paca = &paca[cpu];	mtspr(SPRN_SPRG3, local_paca);} /* * Early initialization entry point. This is called by head.S * with MMU translation disabled. We rely on the "feature" of * the CPU that ignores the top 2 bits of the address in real * mode so we can access kernel globals normally provided we * only toy with things in the RMO region. From here, we do * some early parsing of the device-tree to setup out LMB * data structures, and allocate & initialize the hash table * and segment tables so we can start running with translation * enabled. * * It is this function which will call the probe() callback of * the various platform types and copy the matching one to the * global ppc_md structure. Your platform can eventually do * some very early initializations from the probe() routine, but * this is not recommended, be very careful as, for example, the * device-tree is not accessible via normal means at this point. */ void __init early_setup(unsigned long dt_ptr){	/* Identify CPU type */	identify_cpu(0, mfspr(SPRN_PVR)); 	/* Assume we're on cpu 0 for now. Don't write to the paca yet! */	setup_paca(0); 	/* Enable early debugging if any specified (see udbg.h) */	udbg_early_init();  	DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); 	/*	 * Do early initializations using the flattened device	 * tree, like retreiving the physical memory map or	 * calculating/retreiving the hash table size	 */	early_init_devtree(__va(dt_ptr)); 	/* Now we know the logical id of our boot cpu, setup the paca. */	setup_paca(boot_cpuid); 	/* Fix up paca fields required for the boot cpu */	get_paca()->cpu_start = 1;	get_paca()->stab_real = __pa((u64)&initial_stab);	get_paca()->stab_addr = (u64)&initial_stab; 	/* Probe the machine type */	probe_machine(); 	setup_kdump_trampoline(); 	DBG("Found, Initializing memory management...\n"); 	/*	 * Initialize the MMU Hash table and create the linear mapping	 * of memory. Has to be done before stab/slb initialization as	 * this is currently where the page size encoding is obtained	 */	htab_initialize(); 	/*	 * Initialize stab / SLB management except on iSeries	 */	if (cpu_has_feature(CPU_FTR_SLB))		slb_initialize();	else if (!firmware_has_feature(FW_FEATURE_ISERIES))		stab_initialize(get_paca()->stab_real); 	DBG(" <- early_setup()\n");} #ifdef CONFIG_SMPvoid early_setup_secondary(void){	struct paca_struct *lpaca = get_paca(); 	/* Mark interrupts enabled in PACA */	lpaca->soft_enabled = 0; 	/* Initialize hash table for that CPU */	htab_initialize_secondary(); 	/* Initialize STAB/SLB. We use a virtual address as it works	 * in real mode on pSeries and we want a virutal address on	 * iSeries anyway	 */	if (cpu_has_feature(CPU_FTR_SLB))		slb_initialize();	else		stab_initialize(lpaca->stab_addr);} #endif /* CONFIG_SMP */ #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)void smp_release_cpus(void){	extern unsigned long __secondary_hold_spinloop;	unsigned long *ptr; 	DBG(" -> smp_release_cpus()\n"); 	/* All secondary cpus are spinning on a common spinloop, release them	 * all now so they can start to spin on their individual paca	 * spinloops. For non SMP kernels, the secondary cpus never get out	 * of the common spinloop.	 * This is useless but harmless on iSeries, secondaries are already	 * waiting on their paca spinloops. */ 	ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop			- PHYSICAL_START);	*ptr = 1;	mb(); 	DBG(" <- smp_release_cpus()\n");}#endif /* CONFIG_SMP || CONFIG_KEXEC */ /* * Initialize some remaining members of the ppc64_caches and systemcfg * structures * (at least until we get rid of them completely). This is mostly some * cache informations about the CPU that will be used by cache flush * routines and/or provided to userland */static void __init initialize_cache_info(void){	struct device_node *np;	unsigned long num_cpus = 0; 	DBG(" -> initialize_cache_info()\n"); 	for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {		num_cpus += 1; 		/* We're assuming *all* of the CPUs have the same		 * d-cache and i-cache sizes... -Peter		 */ 		if ( num_cpus == 1 ) {			const u32 *sizep, *lsizep;			u32 size, lsize;			const char *dc, *ic; 			/* Then read cache informations */			if (machine_is(powermac)) {				dc = "d-cache-block-size";				ic = "i-cache-block-size";			} else {				dc = "d-cache-line-size";				ic = "i-cache-line-size";			} 			size = 0;			lsize = cur_cpu_spec->dcache_bsize;			sizep = get_property(np, "d-cache-size", NULL);			if (sizep != NULL)				size = *sizep;			lsizep = get_property(np, dc, NULL);			if (lsizep != NULL)				lsize = *lsizep;			if (sizep == 0 || lsizep == 0)				DBG("Argh, can't find dcache properties ! "				    "sizep: %p, lsizep: %p\n", sizep, lsizep); 			ppc64_caches.dsize = size;			ppc64_caches.dline_size = lsize;			ppc64_caches.log_dline_size = __ilog2(lsize);			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 			size = 0;			lsize = cur_cpu_spec->icache_bsize;			sizep = get_property(np, "i-cache-size", NULL);			if (sizep != NULL)				size = *sizep;			lsizep = get_property(np, ic, NULL);			if (lsizep != NULL)				lsize = *lsizep;			if (sizep == 0 || lsizep == 0)				DBG("Argh, can't find icache properties ! "				    "sizep: %p, lsizep: %p\n", sizep, lsizep); 			ppc64_caches.isize = size;			ppc64_caches.iline_size = lsize;			ppc64_caches.log_iline_size = __ilog2(lsize);			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;		}	} 	DBG(" <- initialize_cache_info()\n");}  /* * Do some initial setup of the system.  The parameters are those which  * were passed in from the bootloader. */void __init setup_system(void){	DBG(" -> setup_system()\n"); 	/* Apply the CPUs-specific and firmware specific fixups to kernel	 * text (nop out sections not relevant to this CPU or this firmware)	 */	do_feature_fixups(cur_cpu_spec->cpu_features,			  &__start___ftr_fixup, &__stop___ftr_fixup);	do_feature_fixups(powerpc_firmware_features,			  &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 	/*	 * Unflatten the device-tree passed by prom_init or kexec	 */	unflatten_device_tree(); 	/*	 * Fill the ppc64_caches & systemcfg structures with informations 	 * retrieved from the device-tree.	 */	initialize_cache_info(); 	/*	 * Initialize irq remapping subsystem	 */	irq_early_init(); #ifdef CONFIG_PPC_RTAS	/*	 * Initialize RTAS if available	 */	rtas_initialize();#endif /* CONFIG_PPC_RTAS */ 	/*	 * Check if we have an initrd provided via the device-tree	 */	check_for_initrd(); 	/*	 * Do some platform specific early initializations, that includes	 * setting up the hash table pointers. It also sets up some interrupt-mapping	 * related options that will be used by finish_device_tree()	 */	if (ppc_md.init_early)		ppc_md.init_early();  	/*	 * We can discover serial ports now since the above did setup the	 * hash table management for us, thus ioremap works. We do that early	 * so that further code can be debugged	 */	find_legacy_serial_ports(); 	/*	 * Register early console	 */	register_early_udbg_console(); 	/*	 * Initialize xmon	 */	xmon_setup(); 	check_smt_enabled();	smp_setup_cpu_maps(); #ifdef CONFIG_SMP	/* Release secondary cpus out of their spinloops at 0x60 now that	 * we can map physical -> logical CPU ids	 */	smp_release_cpus();#endif 	printk("Starting Linux PPC64 %s\n", init_utsname()->version); 	printk("-----------------------------------------------------\n");	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);	printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());	printk("ppc64_caches.dcache_line_size = 0x%x\n",	       ppc64_caches.dline_size);	printk("ppc64_caches.icache_line_size = 0x%x\n",	       ppc64_caches.iline_size);	printk("htab_address                  = 0x%p\n", htab_address);	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);#if PHYSICAL_START > 0	printk("physical_start                = 0x%x\n", PHYSICAL_START);#endif	printk("-----------------------------------------------------\n"); 	DBG(" <- setup_system()\n");} #ifdef CONFIG_IRQSTACKSstatic void __init irqstack_early_init(void){	unsigned int i; 	/*	 * interrupt stacks must be under 256MB, we cannot afford to take	 * SLB misses on them.	 */	for_each_possible_cpu(i) {		softirq_ctx[i] = (struct thread_info *)			__va(lmb_alloc_base(THREAD_SIZE,					    THREAD_SIZE, 0x10000000));		hardirq_ctx[i] = (struct thread_info *)			__va(lmb_alloc_base(THREAD_SIZE,					    THREAD_SIZE, 0x10000000));	}}#else#define irqstack_early_init()#endif /* * Stack space used when we detect a bad kernel stack pointer, and * early in SMP boots before relocation is enabled. */static void __init emergency_stack_init(void){	unsigned long limit;	unsigned int i; 	/*	 * Emergency stacks must be under 256MB, we cannot afford to take	 * SLB misses on them. The ABI also requires them to be 128-byte	 * aligned.	 *	 * Since we use these as temporary stacks during secondary CPU	 * bringup, we need to get at them in real mode. This means they	 * must also be within the RMO region.	 */	limit = min(0x10000000UL, lmb.rmo_size); 	for_each_possible_cpu(i)		paca[i].emergency_sp =		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;} /* * Called into from start_kernel, after lock_kernel has been called. * Initializes bootmem, which is unsed to manage page allocation until * mem_init is called. */void __init setup_arch(char **cmdline_p){	ppc64_boot_msg(0x12, "Setup Arch"); 	*cmdline_p = cmd_line;

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