| 1 | |
| 2 | |
| 3 | * Based on arch/arm/kernel/atags_proc.c
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| 4 |
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| 5 |
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| 6 | #include <linux/fs.h>
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| 7 | #include <linux/init.h>
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| 8 | #include <linux/printk.h>
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| 9 | #include <linux/proc_fs.h>
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| 10 | #include <linux/slab.h>
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| 11 | #include <linux/string.h>
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| 12 |
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| 13 | #include <asm/bootinfo.h>
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| 14 | #include <asm/byteorder.h>
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| 15 |
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| 16 |
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| 17 | static char bootinfo_tmp[1536] __initdata;
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| 18 |
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| 19 | static void *bootinfo_copy;
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| 20 | static size_t bootinfo_size;
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| 21 |
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| 22 | static ssize_t bootinfo_read(struct file *file, char __user *buf,
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| 23 | size_t count, loff_t *ppos)
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| 24 | {
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| 25 | return simple_read_from_buffer(buf, count, ppos, bootinfo_copy,
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| 26 | bootinfo_size);
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| 27 | }
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| 28 |
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| 29 | static const struct proc_ops bootinfo_proc_ops = {
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| 30 | .proc_read = bootinfo_read,
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| 31 | .proc_lseek = default_llseek,
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| 32 | };
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| 33 |
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| 34 | void __init save_bootinfo(const struct bi_record *bi)
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| 35 | {
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| 36 | const void *start = bi;
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| 37 | size_t size = sizeof(bi->tag);
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| 38 |
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| 39 | while (be16_to_cpu(bi->tag) != BI_LAST) {
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| 40 | uint16_t n = be16_to_cpu(bi->size);
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| 41 | size += n;
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| 42 | bi = (struct bi_record *)((unsigned long)bi + n);
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| 43 | }
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| 44 |
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| 45 | if (size > sizeof(bootinfo_tmp)) {
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| 46 | pr_err("Cannot save %zu bytes of bootinfo\n", size);
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| 47 | return;
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| 48 | }
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| 49 |
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| 50 | pr_info("Saving %zu bytes of bootinfo\n", size);
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| 51 | memcpy(bootinfo_tmp, start, size);
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| 52 | bootinfo_size = size;
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| 53 | }
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| 54 |
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| 55 | static int __init init_bootinfo_procfs(void)
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| 56 | {
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| 57 | |
| 58 | * This cannot go into save_bootinfo() because kmalloc and proc don't
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| 59 | * work yet when it is called.
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| 60 |
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| 61 | struct proc_dir_entry *pde;
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| 62 |
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| 63 | if (!bootinfo_size)
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| 64 | return -EINVAL;
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| 65 |
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| 66 | bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL);
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| 67 | if (!bootinfo_copy)
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| 68 | return -ENOMEM;
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| 69 |
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| 70 | pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_proc_ops, NULL);
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| 71 | if (!pde) {
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| 72 | kfree(bootinfo_copy);
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| 73 | return -ENOMEM;
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| 74 | }
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| 75 |
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | arch_initcall(init_bootinfo_procfs);
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