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