arch/sh/kernel/setup.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * arch/sh/kernel/setup.c
  *
  * This file handles the architecture-dependent parts of initialization
  *
  *  Copyright (C) 1999  Niibe Yutaka
  *  Copyright (C) 2002 - 2010 Paul Mundt
  */
 #include <linux/screen_info.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/initrd.h>
 #include <linux/console.h>
 #include <linux/root_dev.h>
 #include <linux/utsname.h>
 #include <linux/nodemask.h>
 #include <linux/cpu.h>
 #include <linux/pfn.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/kexec.h>
 #include <linux/module.h>
 #include <linux/smp.h>
 #include <linux/err.h>
 #include <linux/crash_dump.h>
 #include <linux/mmzone.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/memblock.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/uaccess.h>
 #include <uapi/linux/mount.h>
 #include <asm/io.h>
 #include <asm/page.h>
 #include <asm/elf.h>
 #include <asm/sections.h>
 #include <asm/irq.h>
 #include <asm/setup.h>
 #include <asm/clock.h>
 #include <asm/smp.h>
 #include <asm/mmu_context.h>
 #include <asm/mmzone.h>
 #include <asm/sparsemem.h>
 #include <asm/platform_early.h>

 /*
  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  * This value will be used at the very early stage of serial setup.
  * The bigger value means no problem.
  */
 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
 	[0] = {
 		.type			= CPU_SH_NONE,
 		.family			= CPU_FAMILY_UNKNOWN,
 		.loops_per_jiffy	= 10000000,
 		.phys_bits		= MAX_PHYSMEM_BITS,
 	},
 };
 EXPORT_SYMBOL(cpu_data);

 /*
  * The machine vector. First entry in .machvec.init, or clobbered by
  * sh_mv= on the command line, prior to .machvec.init teardown.
  */
 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
 EXPORT_SYMBOL(sh_mv);

 #ifdef CONFIG_VT
 struct screen_info screen_info;
 #endif

 extern int root_mountflags;

 #define RAMDISK_IMAGE_START_MASK	0x07FF
 #define RAMDISK_PROMPT_FLAG		0x8000
 #define RAMDISK_LOAD_FLAG		0x4000

 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };

 static struct resource code_resource = {
 	.name = "Kernel code",
 	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 };

 static struct resource data_resource = {
 	.name = "Kernel data",
 	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 };

 static struct resource bss_resource = {
 	.name	= "Kernel bss",
 	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 };

 unsigned long memory_start;
 EXPORT_SYMBOL(memory_start);
 unsigned long memory_end = 0;
 EXPORT_SYMBOL(memory_end);
 unsigned long memory_limit = 0;

 static struct resource mem_resources[MAX_NUMNODES];

 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;

 static int __init early_parse_mem(char *p)
 {
 	if (!p)
 		return 1;

 	memory_limit = PAGE_ALIGN(memparse(p, &p));

 	pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);

 	return 0;
 }
 early_param("mem", early_parse_mem);

 void __init check_for_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD
 	unsigned long start, end;

 	/*
 	 * Check for the rare cases where boot loaders adhere to the boot
 	 * ABI.
 	 */
 	if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 		goto disable;

 	start = INITRD_START + __MEMORY_START;
 	end = start + INITRD_SIZE;

 	if (unlikely(end <= start))
 		goto disable;
 	if (unlikely(start & ~PAGE_MASK)) {
 		pr_err("initrd must be page aligned\n");
 		goto disable;
 	}

 	if (unlikely(start < __MEMORY_START)) {
 		pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
 			start, __MEMORY_START);
 		goto disable;
 	}

 	if (unlikely(end > memblock_end_of_DRAM())) {
 		pr_err("initrd extends beyond end of memory "
 		       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 		       end, (unsigned long)memblock_end_of_DRAM());
 		goto disable;
 	}

 	/*
 	 * If we got this far in spite of the boot loader's best efforts
 	 * to the contrary, assume we actually have a valid initrd and
 	 * fix up the root dev.
 	 */
 	ROOT_DEV = Root_RAM0;

 	/*
 	 * Address sanitization
 	 */
 	initrd_start = (unsigned long)__va(start);
 	initrd_end = initrd_start + INITRD_SIZE;

 	memblock_reserve(__pa(initrd_start), INITRD_SIZE);

 	return;

 disable:
 	pr_info("initrd disabled\n");
 	initrd_start = initrd_end = 0;
 #endif
 }

 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
 void calibrate_delay(void)
 {
 	struct clk *clk = clk_get(NULL, "cpu_clk");

 	if (IS_ERR(clk))
 		panic("Need a sane CPU clock definition!");

 	loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;

 	printk(KERN_INFO "Calibrating delay loop (skipped)... "
 			 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 			 loops_per_jiffy/(500000/HZ),
 			 (loops_per_jiffy/(5000/HZ)) % 100,
 			 loops_per_jiffy);
 }
 #endif

 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 						unsigned long end_pfn)
 {
 	struct resource *res = &mem_resources[nid];
 	unsigned long start, end;

 	WARN_ON(res->name); /* max one active range per node for now */

 	start = start_pfn << PAGE_SHIFT;
 	end = end_pfn << PAGE_SHIFT;

 	res->name = "System RAM";
 	res->start = start;
 	res->end = end - 1;
 	res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

 	if (request_resource(&iomem_resource, res)) {
 		pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 		       start_pfn, end_pfn);
 		return;
 	}

 	/*
 	 * We don't know which RAM region contains kernel data or
 	 * the reserved crashkernel region, so try it repeatedly
 	 * and let the resource manager test it.
 	 */
 	request_resource(res, &code_resource);
 	request_resource(res, &data_resource);
 	request_resource(res, &bss_resource);
 #ifdef CONFIG_KEXEC
 	request_resource(res, &crashk_res);
 #endif

 	/*
 	 * Also make sure that there is a PMB mapping that covers this
 	 * range before we attempt to activate it, to avoid reset by MMU.
 	 * We can hit this path with NUMA or memory hot-add.
 	 */
 	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
 			 PAGE_KERNEL);

 	memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
 			  &memblock.memory, nid);
 }

 void __init __weak plat_early_device_setup(void)
 {
 }

 #ifdef CONFIG_OF_FLATTREE
 void __ref sh_fdt_init(phys_addr_t dt_phys)
 {
 	static int done = 0;
 	void *dt_virt;

 	/* Avoid calling an __init function on secondary cpus. */
 	if (done) return;

 #ifdef CONFIG_USE_BUILTIN_DTB
 	dt_virt = __dtb_start;
 #else
 	dt_virt = phys_to_virt(dt_phys);
 #endif

 	if (!dt_virt || !early_init_dt_scan(dt_virt)) {
 		pr_crit("Error: invalid device tree blob"
 			" at physical address %p\n", (void *)dt_phys);

 		while (true)
 			cpu_relax();
 	}

 	done = 1;
 }
 #endif

 void __init setup_arch(char **cmdline_p)
 {
 	enable_mmu();

 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

 	printk(KERN_NOTICE "Boot params:\n"
 			   "... MOUNT_ROOT_RDONLY - %08lx\n"
 			   "... RAMDISK_FLAGS     - %08lx\n"
 			   "... ORIG_ROOT_DEV     - %08lx\n"
 			   "... LOADER_TYPE       - %08lx\n"
 			   "... INITRD_START      - %08lx\n"
 			   "... INITRD_SIZE       - %08lx\n",
 			   MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 			   ORIG_ROOT_DEV, LOADER_TYPE,
 			   INITRD_START, INITRD_SIZE);

 #ifdef CONFIG_BLK_DEV_RAM
 	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 #endif

 	if (!MOUNT_ROOT_RDONLY)
 		root_mountflags &= ~MS_RDONLY;
 	init_mm.start_code = (unsigned long) _text;
 	init_mm.end_code = (unsigned long) _etext;
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = (unsigned long) _end;

 	code_resource.start = virt_to_phys(_text);
 	code_resource.end = virt_to_phys(_etext)-1;
 	data_resource.start = virt_to_phys(_etext);
 	data_resource.end = virt_to_phys(_edata)-1;
 	bss_resource.start = virt_to_phys(__bss_start);
 	bss_resource.end = virt_to_phys(__bss_stop)-1;

 #ifdef CONFIG_CMDLINE_OVERWRITE
 	strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 #else
 	strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 #ifdef CONFIG_CMDLINE_EXTEND
 	strlcat(command_line, " ", sizeof(command_line));
 	strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 #endif
 #endif

 	/* Save unparsed command line copy for /proc/cmdline */
 	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;

 	parse_early_param();

 	plat_early_device_setup();

 	sh_mv_setup();

 	/* Let earlyprintk output early console messages */
 	sh_early_platform_driver_probe("earlyprintk", 1, 1);

 #ifdef CONFIG_OF_FLATTREE
 #ifdef CONFIG_USE_BUILTIN_DTB
 	unflatten_and_copy_device_tree();
 #else
 	unflatten_device_tree();
 #endif
 #endif

 	paging_init();

 	/* Perform the machine specific initialisation */
 	if (likely(sh_mv.mv_setup))
 		sh_mv.mv_setup(cmdline_p);

 	plat_smp_setup();
 }

 /* processor boot mode configuration */
 int generic_mode_pins(void)
 {
 	pr_warn("generic_mode_pins(): missing mode pin configuration\n");
 	return 0;
 }

 int test_mode_pin(int pin)
 {
 	return sh_mv.mv_mode_pins() & pin;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* arch/sh/kernel/setup.c
	*
	* This file handles the architecture-dependent parts of initialization
	*
	* Copyright (C) 1999 Niibe Yutaka
	* Copyright (C) 2002 - 2010 Paul Mundt
	*/
	#include <linux/screen_info.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/initrd.h>
	#include <linux/console.h>
	#include <linux/root_dev.h>
	#include <linux/utsname.h>
	#include <linux/nodemask.h>
	#include <linux/cpu.h>
	#include <linux/pfn.h>
	#include <linux/fs.h>
	#include <linux/mm.h>
	#include <linux/kexec.h>
	#include <linux/module.h>
	#include <linux/smp.h>
	#include <linux/err.h>
	#include <linux/crash_dump.h>
	#include <linux/mmzone.h>
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/memblock.h>
	#include <linux/of.h>
	#include <linux/of_fdt.h>
	#include <linux/uaccess.h>
	#include <uapi/linux/mount.h>
	#include <asm/io.h>
	#include <asm/page.h>
	#include <asm/elf.h>
	#include <asm/sections.h>
	#include <asm/irq.h>
	#include <asm/setup.h>
	#include <asm/clock.h>
	#include <asm/smp.h>
	#include <asm/mmu_context.h>
	#include <asm/mmzone.h>
	#include <asm/sparsemem.h>
	#include <asm/platform_early.h>

	/*
	* Initialize loops_per_jiffy as 10000000 (1000MIPS).
	* This value will be used at the very early stage of serial setup.
	* The bigger value means no problem.
	*/
	struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
	[0] = {
	.type = CPU_SH_NONE,
	.family = CPU_FAMILY_UNKNOWN,
	.loops_per_jiffy = 10000000,
	.phys_bits = MAX_PHYSMEM_BITS,
	},
	};
	EXPORT_SYMBOL(cpu_data);

	/*
	* The machine vector. First entry in .machvec.init, or clobbered by
	* sh_mv= on the command line, prior to .machvec.init teardown.
	*/
	struct sh_machine_vector sh_mv = { .mv_name = "generic", };
	EXPORT_SYMBOL(sh_mv);

	#ifdef CONFIG_VT
	struct screen_info screen_info;
	#endif

	extern int root_mountflags;

	#define RAMDISK_IMAGE_START_MASK 0x07FF
	#define RAMDISK_PROMPT_FLAG 0x8000
	#define RAMDISK_LOAD_FLAG 0x4000

	static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };

	static struct resource code_resource = {
	.name = "Kernel code",
	.flags = IORESOURCE_BUSY \| IORESOURCE_SYSTEM_RAM,
	};

	static struct resource data_resource = {
	.name = "Kernel data",
	.flags = IORESOURCE_BUSY \| IORESOURCE_SYSTEM_RAM,
	};

	static struct resource bss_resource = {
	.name = "Kernel bss",
	.flags = IORESOURCE_BUSY \| IORESOURCE_SYSTEM_RAM,
	};

	unsigned long memory_start;
	EXPORT_SYMBOL(memory_start);
	unsigned long memory_end = 0;
	EXPORT_SYMBOL(memory_end);
	unsigned long memory_limit = 0;

	static struct resource mem_resources[MAX_NUMNODES];

	int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;

	static int __init early_parse_mem(char *p)
	{
	if (!p)
	return 1;

	memory_limit = PAGE_ALIGN(memparse(p, &p));

	pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);

	return 0;
	}
	early_param("mem", early_parse_mem);

	void __init check_for_initrd(void)
	{
	#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long start, end;

	/*
	* Check for the rare cases where boot loaders adhere to the boot
	* ABI.
	*/
	if (!LOADER_TYPE \|\| !INITRD_START \|\| !INITRD_SIZE)
	goto disable;

	start = INITRD_START + __MEMORY_START;
	end = start + INITRD_SIZE;

	if (unlikely(end <= start))
	goto disable;
	if (unlikely(start & ~PAGE_MASK)) {
	pr_err("initrd must be page aligned\n");
	goto disable;
	}

	if (unlikely(start < __MEMORY_START)) {
	pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
	start, __MEMORY_START);
	goto disable;
	}

	if (unlikely(end > memblock_end_of_DRAM())) {
	pr_err("initrd extends beyond end of memory "
	"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
	end, (unsigned long)memblock_end_of_DRAM());
	goto disable;
	}

	/*
	* If we got this far in spite of the boot loader's best efforts
	* to the contrary, assume we actually have a valid initrd and
	* fix up the root dev.
	*/
	ROOT_DEV = Root_RAM0;

	/*
	* Address sanitization
	*/
	initrd_start = (unsigned long)__va(start);
	initrd_end = initrd_start + INITRD_SIZE;

	memblock_reserve(__pa(initrd_start), INITRD_SIZE);

	return;

	disable:
	pr_info("initrd disabled\n");
	initrd_start = initrd_end = 0;
	#endif
	}

	#ifndef CONFIG_GENERIC_CALIBRATE_DELAY
	void calibrate_delay(void)
	{
	struct clk *clk = clk_get(NULL, "cpu_clk");

	if (IS_ERR(clk))
	panic("Need a sane CPU clock definition!");

	loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;

	printk(KERN_INFO "Calibrating delay loop (skipped)... "
	"%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
	loops_per_jiffy/(500000/HZ),
	(loops_per_jiffy/(5000/HZ)) % 100,
	loops_per_jiffy);
	}
	#endif

	void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
	unsigned long end_pfn)
	{
	struct resource *res = &mem_resources[nid];
	unsigned long start, end;

	WARN_ON(res->name); /* max one active range per node for now */

	start = start_pfn << PAGE_SHIFT;
	end = end_pfn << PAGE_SHIFT;

	res->name = "System RAM";
	res->start = start;
	res->end = end - 1;
	res->flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;

	if (request_resource(&iomem_resource, res)) {
	pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
	start_pfn, end_pfn);
	return;
	}

	/*
	* We don't know which RAM region contains kernel data or
	* the reserved crashkernel region, so try it repeatedly
	* and let the resource manager test it.
	*/
	request_resource(res, &code_resource);
	request_resource(res, &data_resource);
	request_resource(res, &bss_resource);
	#ifdef CONFIG_KEXEC
	request_resource(res, &crashk_res);
	#endif

	/*
	* Also make sure that there is a PMB mapping that covers this
	* range before we attempt to activate it, to avoid reset by MMU.
	* We can hit this path with NUMA or memory hot-add.
	*/
	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
	PAGE_KERNEL);

	memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
	&memblock.memory, nid);
	}

	void __init __weak plat_early_device_setup(void)
	{
	}

	#ifdef CONFIG_OF_FLATTREE
	void __ref sh_fdt_init(phys_addr_t dt_phys)
	{
	static int done = 0;
	void *dt_virt;

	/* Avoid calling an __init function on secondary cpus. */
	if (done) return;

	#ifdef CONFIG_USE_BUILTIN_DTB
	dt_virt = __dtb_start;
	#else
	dt_virt = phys_to_virt(dt_phys);
	#endif

	if (!dt_virt \|\| !early_init_dt_scan(dt_virt)) {
	pr_crit("Error: invalid device tree blob"
	" at physical address %p\n", (void *)dt_phys);

	while (true)
	cpu_relax();
	}

	done = 1;
	}
	#endif

	void __init setup_arch(char **cmdline_p)
	{
	enable_mmu();

	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

	printk(KERN_NOTICE "Boot params:\n"
	"... MOUNT_ROOT_RDONLY - %08lx\n"
	"... RAMDISK_FLAGS - %08lx\n"
	"... ORIG_ROOT_DEV - %08lx\n"
	"... LOADER_TYPE - %08lx\n"
	"... INITRD_START - %08lx\n"
	"... INITRD_SIZE - %08lx\n",
	MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
	ORIG_ROOT_DEV, LOADER_TYPE,
	INITRD_START, INITRD_SIZE);

	#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
	#endif

	if (!MOUNT_ROOT_RDONLY)
	root_mountflags &= ~MS_RDONLY;
	init_mm.start_code = (unsigned long) _text;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) _end;

	code_resource.start = virt_to_phys(_text);
	code_resource.end = virt_to_phys(_etext)-1;
	data_resource.start = virt_to_phys(_etext);
	data_resource.end = virt_to_phys(_edata)-1;
	bss_resource.start = virt_to_phys(__bss_start);
	bss_resource.end = virt_to_phys(__bss_stop)-1;

	#ifdef CONFIG_CMDLINE_OVERWRITE
	strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
	#else
	strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
	#ifdef CONFIG_CMDLINE_EXTEND
	strlcat(command_line, " ", sizeof(command_line));
	strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
	#endif
	#endif

	/* Save unparsed command line copy for /proc/cmdline */
	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	*cmdline_p = command_line;

	parse_early_param();

	plat_early_device_setup();

	sh_mv_setup();

	/* Let earlyprintk output early console messages */
	sh_early_platform_driver_probe("earlyprintk", 1, 1);

	#ifdef CONFIG_OF_FLATTREE
	#ifdef CONFIG_USE_BUILTIN_DTB
	unflatten_and_copy_device_tree();
	#else
	unflatten_device_tree();
	#endif
	#endif

	paging_init();

	/* Perform the machine specific initialisation */
	if (likely(sh_mv.mv_setup))
	sh_mv.mv_setup(cmdline_p);

	plat_smp_setup();
	}

	/* processor boot mode configuration */
	int generic_mode_pins(void)
	{
	pr_warn("generic_mode_pins(): missing mode pin configuration\n");
	return 0;
	}

	int test_mode_pin(int pin)
	{
	return sh_mv.mv_mode_pins() & pin;
	}