// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation */ #include <linux/init.h>#include <linux/memblock.h>#include <linux/mm.h>#include <linux/proc_fs.h>#include <linux/kernel.h>#include <linux/of.h>#include <linux/string.h> #include <asm/machdep.h>#include <asm/vdso_datapage.h>#include <asm/rtas.h>#include <asm/systemcfg.h>#include <linux/uaccess.h> #ifdef CONFIG_PPC64_PROC_SYSTEMCFG static loff_t page_map_seek(struct file *file, loff_t off, int whence){	return fixed_size_llseek(file, off, whence, PAGE_SIZE);} static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,			      loff_t *ppos){	return simple_read_from_buffer(buf, nbytes, ppos,			pde_data(file_inode(file)), PAGE_SIZE);} static int page_map_mmap( struct file *file, struct vm_area_struct *vma ){	if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)		return -EINVAL; 	return remap_pfn_range(vma, vma->vm_start,			       __pa(pde_data(file_inode(file))) >> PAGE_SHIFT,			       PAGE_SIZE, vma->vm_page_prot);} static const struct proc_ops page_map_proc_ops = {	.proc_lseek	= page_map_seek,	.proc_read	= page_map_read,	.proc_mmap	= page_map_mmap,}; static union {	struct systemcfg	data;	u8			page[PAGE_SIZE];} systemcfg_data_store __page_aligned_data;struct systemcfg *systemcfg = &systemcfg_data_store.data; static int __init proc_ppc64_init(void){	struct proc_dir_entry *pde; 	strscpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");	systemcfg->version.major = SYSTEMCFG_MAJOR;	systemcfg->version.minor = SYSTEMCFG_MINOR;	systemcfg->processor = mfspr(SPRN_PVR);	/*	 * Fake the old platform number for pSeries and add	 * in LPAR bit if necessary	 */	systemcfg->platform = 0x100;	if (firmware_has_feature(FW_FEATURE_LPAR))		systemcfg->platform |= 1;	systemcfg->physicalMemorySize = memblock_phys_mem_size();	systemcfg->dcache_size = ppc64_caches.l1d.size;	systemcfg->dcache_line_size = ppc64_caches.l1d.line_size;	systemcfg->icache_size = ppc64_caches.l1i.size;	systemcfg->icache_line_size = ppc64_caches.l1i.line_size; 	pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL,			       &page_map_proc_ops, systemcfg);	if (!pde)		return 1;	proc_set_size(pde, PAGE_SIZE); 	return 0;}__initcall(proc_ppc64_init); #endif /* CONFIG_PPC64_PROC_SYSTEMCFG */ /* * Create the ppc64 and ppc64/rtas directories early. This allows us to * assume that they have been previously created in drivers. */static int __init proc_ppc64_create(void){	struct proc_dir_entry *root; 	root = proc_mkdir("powerpc", NULL);	if (!root)		return 1; #ifdef CONFIG_PPC64	if (!proc_symlink("ppc64", NULL, "powerpc"))		pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");#endif 	if (!of_find_node_by_path("/rtas"))		return 0; 	if (!proc_mkdir("rtas", root))		return 1; 	if (!proc_symlink("rtas", NULL, "powerpc/rtas"))		return 1; 	return 0;}core_initcall(proc_ppc64_create);