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79 lines
1.7 KiB
79 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Based on arch/arm/kernel/atags_proc.c |
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*/ |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/printk.h> |
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#include <linux/proc_fs.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include <asm/bootinfo.h> |
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#include <asm/byteorder.h> |
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static char bootinfo_tmp[1536] __initdata; |
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static void *bootinfo_copy; |
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static size_t bootinfo_size; |
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static ssize_t bootinfo_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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return simple_read_from_buffer(buf, count, ppos, bootinfo_copy, |
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bootinfo_size); |
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} |
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static const struct proc_ops bootinfo_proc_ops = { |
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.proc_read = bootinfo_read, |
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.proc_lseek = default_llseek, |
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}; |
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void __init save_bootinfo(const struct bi_record *bi) |
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{ |
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const void *start = bi; |
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size_t size = sizeof(bi->tag); |
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while (be16_to_cpu(bi->tag) != BI_LAST) { |
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uint16_t n = be16_to_cpu(bi->size); |
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size += n; |
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bi = (struct bi_record *)((unsigned long)bi + n); |
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} |
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if (size > sizeof(bootinfo_tmp)) { |
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pr_err("Cannot save %zu bytes of bootinfo\n", size); |
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return; |
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} |
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pr_info("Saving %zu bytes of bootinfo\n", size); |
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memcpy(bootinfo_tmp, start, size); |
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bootinfo_size = size; |
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} |
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static int __init init_bootinfo_procfs(void) |
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{ |
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/* |
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* This cannot go into save_bootinfo() because kmalloc and proc don't |
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* work yet when it is called. |
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*/ |
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struct proc_dir_entry *pde; |
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if (!bootinfo_size) |
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return -EINVAL; |
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bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL); |
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if (!bootinfo_copy) |
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return -ENOMEM; |
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pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_proc_ops, NULL); |
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if (!pde) { |
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kfree(bootinfo_copy); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
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arch_initcall(init_bootinfo_procfs);
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