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