1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation 4 */ 5 6 #include <linux/init.h> 7 #include <linux/memblock.h> 8 #include <linux/mm.h> 9 #include <linux/proc_fs.h> 10 #include <linux/kernel.h> 11 #include <linux/of.h> 12 #include <linux/string.h> 13 14 #include <asm/machdep.h> 15 #include <asm/vdso_datapage.h> 16 #include <asm/rtas.h> 17 #include <asm/systemcfg.h> 18 #include <linux/uaccess.h> 19 20 #ifdef CONFIG_PPC64_PROC_SYSTEMCFG 21 22 static loff_t page_map_seek(struct file *file, loff_t off, int whence) 23 { 24 return fixed_size_llseek(file, off, whence, PAGE_SIZE); 25 } 26 27 static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, 28 loff_t *ppos) 29 { 30 return simple_read_from_buffer(buf, nbytes, ppos, 31 pde_data(file_inode(file)), PAGE_SIZE); 32 } 33 34 static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) 35 { 36 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) 37 return -EINVAL; 38 39 return remap_pfn_range(vma, vma->vm_start, 40 __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, 41 PAGE_SIZE, vma->vm_page_prot); 42 } 43 44 static const struct proc_ops page_map_proc_ops = { 45 .proc_lseek = page_map_seek, 46 .proc_read = page_map_read, 47 .proc_mmap = page_map_mmap, 48 }; 49 50 static union { 51 struct systemcfg data; 52 u8 page[PAGE_SIZE]; 53 } systemcfg_data_store __page_aligned_data; 54 struct systemcfg *systemcfg = &systemcfg_data_store.data; 55 56 static int __init proc_ppc64_init(void) 57 { 58 struct proc_dir_entry *pde; 59 60 strscpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64"); 61 systemcfg->version.major = SYSTEMCFG_MAJOR; 62 systemcfg->version.minor = SYSTEMCFG_MINOR; 63 systemcfg->processor = mfspr(SPRN_PVR); 64 /* 65 * Fake the old platform number for pSeries and add 66 * in LPAR bit if necessary 67 */ 68 systemcfg->platform = 0x100; 69 if (firmware_has_feature(FW_FEATURE_LPAR)) 70 systemcfg->platform |= 1; 71 systemcfg->physicalMemorySize = memblock_phys_mem_size(); 72 systemcfg->dcache_size = ppc64_caches.l1d.size; 73 systemcfg->dcache_line_size = ppc64_caches.l1d.line_size; 74 systemcfg->icache_size = ppc64_caches.l1i.size; 75 systemcfg->icache_line_size = ppc64_caches.l1i.line_size; 76 77 pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL, 78 &page_map_proc_ops, systemcfg); 79 if (!pde) 80 return 1; 81 proc_set_size(pde, PAGE_SIZE); 82 83 return 0; 84 } 85 __initcall(proc_ppc64_init); 86 87 #endif /* CONFIG_PPC64_PROC_SYSTEMCFG */ 88 89 /* 90 * Create the ppc64 and ppc64/rtas directories early. This allows us to 91 * assume that they have been previously created in drivers. 92 */ 93 static int __init proc_ppc64_create(void) 94 { 95 struct proc_dir_entry *root; 96 97 root = proc_mkdir("powerpc", NULL); 98 if (!root) 99 return 1; 100 101 #ifdef CONFIG_PPC64 102 if (!proc_symlink("ppc64", NULL, "powerpc")) 103 pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); 104 #endif 105 106 if (!of_find_node_by_path("/rtas")) 107 return 0; 108 109 if (!proc_mkdir("rtas", root)) 110 return 1; 111 112 if (!proc_symlink("rtas", NULL, "powerpc/rtas")) 113 return 1; 114 115 return 0; 116 } 117 core_initcall(proc_ppc64_create); 118