/* * Common prep/pmac/chrp boot and setup code. */ #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/tty.h>#include <linux/seq_file.h>#include <linux/root_dev.h>#include <linux/cpu.h>#include <linux/console.h>#include <linux/memblock.h>#include <linux/export.h> #include <asm/io.h>#include <asm/prom.h>#include <asm/processor.h>#include <asm/pgtable.h>#include <asm/setup.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 <linux/uaccess.h>#include <asm/pmac_feature.h>#include <asm/sections.h>#include <asm/nvram.h>#include <asm/xmon.h>#include <asm/time.h>#include <asm/serial.h>#include <asm/udbg.h>#include <asm/code-patching.h>#include <asm/cpu_has_feature.h> #define DBG(fmt...) extern void bootx_init(unsigned long r4, unsigned long phys); int boot_cpuid_phys;EXPORT_SYMBOL_GPL(boot_cpuid_phys); int smp_hw_index[NR_CPUS];EXPORT_SYMBOL(smp_hw_index); unsigned long ISA_DMA_THRESHOLD;unsigned int DMA_MODE_READ;unsigned int DMA_MODE_WRITE; EXPORT_SYMBOL(ISA_DMA_THRESHOLD);EXPORT_SYMBOL(DMA_MODE_READ);EXPORT_SYMBOL(DMA_MODE_WRITE); /* * We're called here very early in the boot. * * 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 */notrace 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((void __iomem *)PTRRELOC(&__bss_start), 0,			__bss_stop - __bss_start); 	/*	 * Identify the CPU type and fix up code sections	 * that depend on which cpu we have.	 */	identify_cpu(offset, mfspr(SPRN_PVR)); 	apply_feature_fixups(); 	return KERNELBASE + offset;}  /* * This is run before start_kernel(), the kernel has been relocated * and we are running with enough of the MMU enabled to have our * proper kernel virtual addresses * * We do the initial parsing of the flat device-tree and prepares * for the MMU to be fully initialized. */extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */ notrace void __init machine_init(u64 dt_ptr){	/* Configure static keys first, now that we're relocated. */	setup_feature_keys(); 	/* Enable early debugging if any specified (see udbg.h) */	udbg_early_init(); 	patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP);	patch_instruction(&memset_nocache_branch, PPC_INST_NOP); 	/* Do some early initialization based on the flat device tree */	early_init_devtree(__va(dt_ptr)); 	early_init_mmu(); 	setup_kdump_trampoline();} /* 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); /* Checks "l3cr=xxxx" command-line option */int __init ppc_setup_l3cr(char *str){	if (cpu_has_feature(CPU_FTR_L3CR)) {		unsigned long val = simple_strtoul(str, NULL, 0);		printk(KERN_INFO "l3cr set to %lx\n", val);		_set_L3CR(val);		/* and enable it */	}	return 1;}__setup("l3cr=", ppc_setup_l3cr); #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); ssize_t nvram_get_size(void){	if (ppc_md.nvram_size)		return ppc_md.nvram_size();	return -1;}EXPORT_SYMBOL(nvram_get_size); void nvram_sync(void){	if (ppc_md.nvram_sync)		ppc_md.nvram_sync();}EXPORT_SYMBOL(nvram_sync); #endif /* CONFIG_NVRAM */ int __init ppc_init(void){	/* clear the progress line */	if (ppc_md.progress)		ppc_md.progress("             ", 0xffff); 	/* call platform init */	if (ppc_md.init != NULL) {		ppc_md.init();	}	return 0;} arch_initcall(ppc_init); void __init irqstack_early_init(void){	unsigned int i; 	/* interrupt stacks must be in lowmem, we get that for free on ppc32	 * as the memblock is limited to lowmem by default */	for_each_possible_cpu(i) {		softirq_ctx[i] = (struct thread_info *)			__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));		hardirq_ctx[i] = (struct thread_info *)			__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));	}} #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)void __init exc_lvl_early_init(void){	unsigned int i, hw_cpu; 	/* interrupt stacks must be in lowmem, we get that for free on ppc32	 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */	for_each_possible_cpu(i) {#ifdef CONFIG_SMP		hw_cpu = get_hard_smp_processor_id(i);#else		hw_cpu = 0;#endif 		critirq_ctx[hw_cpu] = (struct thread_info *)			__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));#ifdef CONFIG_BOOKE		dbgirq_ctx[hw_cpu] = (struct thread_info *)			__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));		mcheckirq_ctx[hw_cpu] = (struct thread_info *)			__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));#endif	}}#endif void __init setup_power_save(void){#ifdef CONFIG_6xx	if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||	    cpu_has_feature(CPU_FTR_CAN_NAP))		ppc_md.power_save = ppc6xx_idle;#endif #ifdef CONFIG_E500	if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||	    cpu_has_feature(CPU_FTR_CAN_NAP))		ppc_md.power_save = e500_idle;#endif} __init void initialize_cache_info(void){	/*	 * 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.	 */	dcache_bsize = cur_cpu_spec->dcache_bsize;	icache_bsize = cur_cpu_spec->icache_bsize;	ucache_bsize = 0;	if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))		ucache_bsize = icache_bsize = dcache_bsize;}