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