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arch/powerpc/kernel/setup_32.c
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/* * Common prep/pmac/chrp boot and setup code. */ |
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#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> |
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#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> |
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#include <linux/memblock.h> |
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#include <asm/io.h> #include <asm/prom.h> #include <asm/processor.h> #include <asm/pgtable.h> |
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#include <asm/setup.h> |
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#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> |
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#include <asm/time.h> |
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#include <asm/serial.h> |
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#include <asm/udbg.h> |
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#include <asm/mmu_context.h> |
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#include "setup.h" |
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#define DBG(fmt...) |
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extern void bootx_init(unsigned long r4, unsigned long phys); |
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int boot_cpuid = -1; |
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EXPORT_SYMBOL_GPL(boot_cpuid); int boot_cpuid_phys; |
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EXPORT_SYMBOL_GPL(boot_cpuid_phys); |
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int smp_hw_index[NR_CPUS]; |
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unsigned long ISA_DMA_THRESHOLD; unsigned int DMA_MODE_READ; unsigned int DMA_MODE_WRITE; |
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#ifdef CONFIG_VGA_CONSOLE unsigned long vgacon_remap_base; |
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EXPORT_SYMBOL(vgacon_remap_base); |
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#endif |
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/* * 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; |
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/* * 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 */ |
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notrace unsigned long __init early_init(unsigned long dt_ptr) |
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{ unsigned long offset = reloc_offset(); |
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struct cpu_spec *spec; |
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/* First zero the BSS -- use memset_io, some platforms don't have * caches on yet */ |
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memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start); |
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/* * Identify the CPU type and fix up code sections * that depend on which cpu we have. */ |
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spec = identify_cpu(offset, mfspr(SPRN_PVR)); |
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do_feature_fixups(spec->cpu_features, |
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PTRRELOC(&__start___ftr_fixup), PTRRELOC(&__stop___ftr_fixup)); |
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do_feature_fixups(spec->mmu_features, PTRRELOC(&__start___mmu_ftr_fixup), PTRRELOC(&__stop___mmu_ftr_fixup)); |
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do_lwsync_fixups(spec->cpu_features, PTRRELOC(&__start___lwsync_fixup), PTRRELOC(&__stop___lwsync_fixup)); |
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do_final_fixups(); |
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return KERNELBASE + offset; } |
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/* * 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. */ |
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notrace void __init machine_init(u64 dt_ptr) |
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{ |
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lockdep_init(); |
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/* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); |
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/* Do some early initialization based on the flat device tree */ |
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early_init_devtree(__va(dt_ptr)); |
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early_init_mmu(); |
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probe_machine(); |
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setup_kdump_trampoline(); |
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#ifdef CONFIG_6xx |
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if (cpu_has_feature(CPU_FTR_CAN_DOZE) || cpu_has_feature(CPU_FTR_CAN_NAP)) ppc_md.power_save = ppc6xx_idle; |
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#endif |
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#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 |
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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 */ |
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notrace int __init early_parse_wdt(char *p) |
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{ 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 ", val); _set_L2CR(0); /* force invalidate by disable cache */ _set_L2CR(val); /* and enable it */ } return 1; } __setup("l2cr=", ppc_setup_l2cr); |
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/* 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 ", val); _set_L3CR(val); /* and enable it */ } return 1; } __setup("l3cr=", ppc_setup_l3cr); |
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#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); |
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ssize_t nvram_get_size(void) { if (ppc_md.nvram_size) return ppc_md.nvram_size(); return -1; } EXPORT_SYMBOL(nvram_get_size); |
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void nvram_sync(void) { if (ppc_md.nvram_sync) ppc_md.nvram_sync(); } EXPORT_SYMBOL(nvram_sync); #endif /* CONFIG_NVRAM */ |
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int __init ppc_init(void) { |
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/* clear the progress line */ |
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if (ppc_md.progress) ppc_md.progress(" ", 0xffff); |
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/* call platform init */ if (ppc_md.init != NULL) { ppc_md.init(); } return 0; } arch_initcall(ppc_init); |
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static void __init irqstack_early_init(void) { unsigned int i; /* interrupt stacks must be in lowmem, we get that for free on ppc32 |
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* as the memblock is limited to lowmem by default */ |
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for_each_possible_cpu(i) { softirq_ctx[i] = (struct thread_info *) |
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__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
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hardirq_ctx[i] = (struct thread_info *) |
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__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
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} } |
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#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) static void __init exc_lvl_early_init(void) { |
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unsigned int i, hw_cpu; |
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/* interrupt stacks must be in lowmem, we get that for free on ppc32 |
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* as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ |
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for_each_possible_cpu(i) { |
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hw_cpu = get_hard_smp_processor_id(i); critirq_ctx[hw_cpu] = (struct thread_info *) |
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__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
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#ifdef CONFIG_BOOKE |
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dbgirq_ctx[hw_cpu] = (struct thread_info *) |
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__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
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mcheckirq_ctx[hw_cpu] = (struct thread_info *) |
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__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE)); |
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#endif } } #else #define exc_lvl_early_init() #endif |
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/* Warning, IO base is not yet inited */ void __init setup_arch(char **cmdline_p) { |
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*cmdline_p = cmd_line; |
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/* so udelay does something sensible, assume <= 1000 bogomips */ loops_per_jiffy = 500000000 / HZ; |
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unflatten_device_tree(); |
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check_for_initrd(); |
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if (ppc_md.init_early) ppc_md.init_early(); |
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find_legacy_serial_ports(); |
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smp_setup_cpu_maps(); |
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/* Register early console */ register_early_udbg_console(); |
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xmon_setup(); |
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/* * 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. */ |
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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; |
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/* reboot on panic */ panic_timeout = 180; |
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if (ppc_md.panic) setup_panic(); |
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init_mm.start_code = (unsigned long)_stext; |
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init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; |
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init_mm.brk = klimit; |
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exc_lvl_early_init(); |
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irqstack_early_init(); |
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/* set up the bootmem stuff with available memory */ do_init_bootmem(); if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab); |
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#ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; #endif |
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if (ppc_md.setup_arch) ppc_md.setup_arch(); |
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if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab); paging_init(); |
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/* Initialize the MMU context management stuff */ mmu_context_init(); |
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} |