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359 lines
8.5 KiB
359 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/kernel/setup.c |
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* |
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* This file handles the architecture-dependent parts of initialization |
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* |
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* Copyright (C) 1999 Niibe Yutaka |
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* Copyright (C) 2002 - 2010 Paul Mundt |
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*/ |
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#include <linux/screen_info.h> |
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#include <linux/ioport.h> |
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#include <linux/init.h> |
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#include <linux/initrd.h> |
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#include <linux/console.h> |
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#include <linux/root_dev.h> |
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#include <linux/utsname.h> |
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#include <linux/nodemask.h> |
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#include <linux/cpu.h> |
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#include <linux/pfn.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/kexec.h> |
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#include <linux/module.h> |
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#include <linux/smp.h> |
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#include <linux/err.h> |
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#include <linux/crash_dump.h> |
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#include <linux/mmzone.h> |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/platform_device.h> |
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#include <linux/memblock.h> |
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#include <linux/of.h> |
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#include <linux/of_fdt.h> |
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#include <linux/uaccess.h> |
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#include <uapi/linux/mount.h> |
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#include <asm/io.h> |
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#include <asm/page.h> |
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#include <asm/elf.h> |
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#include <asm/sections.h> |
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#include <asm/irq.h> |
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#include <asm/setup.h> |
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#include <asm/clock.h> |
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#include <asm/smp.h> |
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#include <asm/mmu_context.h> |
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#include <asm/mmzone.h> |
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#include <asm/sparsemem.h> |
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#include <asm/platform_early.h> |
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/* |
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* Initialize loops_per_jiffy as 10000000 (1000MIPS). |
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* This value will be used at the very early stage of serial setup. |
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* The bigger value means no problem. |
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*/ |
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struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { |
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[0] = { |
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.type = CPU_SH_NONE, |
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.family = CPU_FAMILY_UNKNOWN, |
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.loops_per_jiffy = 10000000, |
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.phys_bits = MAX_PHYSMEM_BITS, |
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}, |
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}; |
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EXPORT_SYMBOL(cpu_data); |
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/* |
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* The machine vector. First entry in .machvec.init, or clobbered by |
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* sh_mv= on the command line, prior to .machvec.init teardown. |
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*/ |
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struct sh_machine_vector sh_mv = { .mv_name = "generic", }; |
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EXPORT_SYMBOL(sh_mv); |
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#ifdef CONFIG_VT |
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struct screen_info screen_info; |
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#endif |
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extern int root_mountflags; |
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#define RAMDISK_IMAGE_START_MASK 0x07FF |
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#define RAMDISK_PROMPT_FLAG 0x8000 |
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#define RAMDISK_LOAD_FLAG 0x4000 |
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static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; |
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static struct resource code_resource = { |
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.name = "Kernel code", |
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
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}; |
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static struct resource data_resource = { |
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.name = "Kernel data", |
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
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}; |
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static struct resource bss_resource = { |
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.name = "Kernel bss", |
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
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}; |
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unsigned long memory_start; |
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EXPORT_SYMBOL(memory_start); |
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unsigned long memory_end = 0; |
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EXPORT_SYMBOL(memory_end); |
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unsigned long memory_limit = 0; |
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static struct resource mem_resources[MAX_NUMNODES]; |
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int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; |
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static int __init early_parse_mem(char *p) |
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{ |
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if (!p) |
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return 1; |
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memory_limit = PAGE_ALIGN(memparse(p, &p)); |
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pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); |
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return 0; |
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} |
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early_param("mem", early_parse_mem); |
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void __init check_for_initrd(void) |
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{ |
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#ifdef CONFIG_BLK_DEV_INITRD |
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unsigned long start, end; |
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/* |
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* Check for the rare cases where boot loaders adhere to the boot |
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* ABI. |
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*/ |
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if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) |
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goto disable; |
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start = INITRD_START + __MEMORY_START; |
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end = start + INITRD_SIZE; |
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if (unlikely(end <= start)) |
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goto disable; |
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if (unlikely(start & ~PAGE_MASK)) { |
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pr_err("initrd must be page aligned\n"); |
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goto disable; |
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} |
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if (unlikely(start < __MEMORY_START)) { |
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pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n", |
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start, __MEMORY_START); |
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goto disable; |
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} |
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if (unlikely(end > memblock_end_of_DRAM())) { |
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pr_err("initrd extends beyond end of memory " |
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"(0x%08lx > 0x%08lx)\ndisabling initrd\n", |
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end, (unsigned long)memblock_end_of_DRAM()); |
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goto disable; |
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} |
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/* |
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* If we got this far in spite of the boot loader's best efforts |
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* to the contrary, assume we actually have a valid initrd and |
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* fix up the root dev. |
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*/ |
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ROOT_DEV = Root_RAM0; |
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/* |
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* Address sanitization |
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*/ |
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initrd_start = (unsigned long)__va(start); |
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initrd_end = initrd_start + INITRD_SIZE; |
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memblock_reserve(__pa(initrd_start), INITRD_SIZE); |
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return; |
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disable: |
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pr_info("initrd disabled\n"); |
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initrd_start = initrd_end = 0; |
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#endif |
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} |
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#ifndef CONFIG_GENERIC_CALIBRATE_DELAY |
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void calibrate_delay(void) |
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{ |
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struct clk *clk = clk_get(NULL, "cpu_clk"); |
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if (IS_ERR(clk)) |
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panic("Need a sane CPU clock definition!"); |
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loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; |
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printk(KERN_INFO "Calibrating delay loop (skipped)... " |
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"%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", |
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loops_per_jiffy/(500000/HZ), |
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(loops_per_jiffy/(5000/HZ)) % 100, |
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loops_per_jiffy); |
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} |
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#endif |
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void __init __add_active_range(unsigned int nid, unsigned long start_pfn, |
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unsigned long end_pfn) |
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{ |
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struct resource *res = &mem_resources[nid]; |
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unsigned long start, end; |
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WARN_ON(res->name); /* max one active range per node for now */ |
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start = start_pfn << PAGE_SHIFT; |
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end = end_pfn << PAGE_SHIFT; |
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res->name = "System RAM"; |
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res->start = start; |
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res->end = end - 1; |
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res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
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if (request_resource(&iomem_resource, res)) { |
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pr_err("unable to request memory_resource 0x%lx 0x%lx\n", |
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start_pfn, end_pfn); |
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return; |
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} |
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/* |
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* We don't know which RAM region contains kernel data or |
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* the reserved crashkernel region, so try it repeatedly |
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* and let the resource manager test it. |
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*/ |
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request_resource(res, &code_resource); |
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request_resource(res, &data_resource); |
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request_resource(res, &bss_resource); |
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#ifdef CONFIG_KEXEC |
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request_resource(res, &crashk_res); |
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#endif |
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/* |
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* Also make sure that there is a PMB mapping that covers this |
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* range before we attempt to activate it, to avoid reset by MMU. |
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* We can hit this path with NUMA or memory hot-add. |
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*/ |
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pmb_bolt_mapping((unsigned long)__va(start), start, end - start, |
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PAGE_KERNEL); |
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memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), |
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&memblock.memory, nid); |
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} |
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void __init __weak plat_early_device_setup(void) |
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{ |
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} |
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#ifdef CONFIG_OF_FLATTREE |
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void __ref sh_fdt_init(phys_addr_t dt_phys) |
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{ |
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static int done = 0; |
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void *dt_virt; |
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/* Avoid calling an __init function on secondary cpus. */ |
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if (done) return; |
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#ifdef CONFIG_USE_BUILTIN_DTB |
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dt_virt = __dtb_start; |
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#else |
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dt_virt = phys_to_virt(dt_phys); |
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#endif |
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if (!dt_virt || !early_init_dt_scan(dt_virt)) { |
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pr_crit("Error: invalid device tree blob" |
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" at physical address %p\n", (void *)dt_phys); |
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while (true) |
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cpu_relax(); |
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} |
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done = 1; |
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} |
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#endif |
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void __init setup_arch(char **cmdline_p) |
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{ |
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enable_mmu(); |
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ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); |
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printk(KERN_NOTICE "Boot params:\n" |
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"... MOUNT_ROOT_RDONLY - %08lx\n" |
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"... RAMDISK_FLAGS - %08lx\n" |
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"... ORIG_ROOT_DEV - %08lx\n" |
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"... LOADER_TYPE - %08lx\n" |
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"... INITRD_START - %08lx\n" |
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"... INITRD_SIZE - %08lx\n", |
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MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, |
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ORIG_ROOT_DEV, LOADER_TYPE, |
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INITRD_START, INITRD_SIZE); |
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#ifdef CONFIG_BLK_DEV_RAM |
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rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; |
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#endif |
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if (!MOUNT_ROOT_RDONLY) |
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root_mountflags &= ~MS_RDONLY; |
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init_mm.start_code = (unsigned long) _text; |
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init_mm.end_code = (unsigned long) _etext; |
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init_mm.end_data = (unsigned long) _edata; |
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init_mm.brk = (unsigned long) _end; |
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code_resource.start = virt_to_phys(_text); |
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code_resource.end = virt_to_phys(_etext)-1; |
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data_resource.start = virt_to_phys(_etext); |
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data_resource.end = virt_to_phys(_edata)-1; |
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bss_resource.start = virt_to_phys(__bss_start); |
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bss_resource.end = virt_to_phys(__bss_stop)-1; |
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#ifdef CONFIG_CMDLINE_OVERWRITE |
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strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); |
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#else |
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strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); |
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#ifdef CONFIG_CMDLINE_EXTEND |
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strlcat(command_line, " ", sizeof(command_line)); |
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strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); |
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#endif |
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#endif |
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/* Save unparsed command line copy for /proc/cmdline */ |
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memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
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*cmdline_p = command_line; |
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parse_early_param(); |
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plat_early_device_setup(); |
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sh_mv_setup(); |
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/* Let earlyprintk output early console messages */ |
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sh_early_platform_driver_probe("earlyprintk", 1, 1); |
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#ifdef CONFIG_OF_FLATTREE |
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#ifdef CONFIG_USE_BUILTIN_DTB |
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unflatten_and_copy_device_tree(); |
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#else |
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unflatten_device_tree(); |
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#endif |
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#endif |
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paging_init(); |
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/* Perform the machine specific initialisation */ |
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if (likely(sh_mv.mv_setup)) |
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sh_mv.mv_setup(cmdline_p); |
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plat_smp_setup(); |
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} |
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/* processor boot mode configuration */ |
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int generic_mode_pins(void) |
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{ |
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pr_warn("generic_mode_pins(): missing mode pin configuration\n"); |
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return 0; |
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} |
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int test_mode_pin(int pin) |
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{ |
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return sh_mv.mv_mode_pins() & pin; |
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}
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