2008-01-01 16:56:46 -07:00
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#include <linux/slab.h>
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#include <linux/kexec.h>
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#include <linux/proc_fs.h>
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#include <asm/setup.h>
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#include <asm/types.h>
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#include <asm/page.h>
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struct buffer {
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size_t size;
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char *data;
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};
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static struct buffer tags_buffer;
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static int
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read_buffer(char* page, char** start, off_t off, int count,
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int* eof, void* data)
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{
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struct buffer *buffer = (struct buffer *)data;
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if (off >= buffer->size) {
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*eof = 1;
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return 0;
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}
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count = min((int) (buffer->size - off), count);
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memcpy(page, &buffer->data[off], count);
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return count;
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}
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static int
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create_proc_entries(void)
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{
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struct proc_dir_entry* tags_entry;
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2008-04-29 02:01:44 -06:00
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tags_entry = create_proc_read_entry("atags", 0400, NULL, read_buffer, &tags_buffer);
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2008-01-01 16:56:46 -07:00
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if (!tags_entry)
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return -ENOMEM;
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return 0;
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}
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static char __initdata atags_copy_buf[KEXEC_BOOT_PARAMS_SIZE];
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static char __initdata *atags_copy;
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void __init save_atags(const struct tag *tags)
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{
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atags_copy = atags_copy_buf;
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memcpy(atags_copy, tags, KEXEC_BOOT_PARAMS_SIZE);
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}
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static int __init init_atags_procfs(void)
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{
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struct tag *tag;
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int error;
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if (!atags_copy) {
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printk(KERN_WARNING "Exporting ATAGs: No saved tags found\n");
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return -EIO;
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}
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for (tag = (struct tag *) atags_copy; tag->hdr.size; tag = tag_next(tag))
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;
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tags_buffer.size = ((char *) tag - atags_copy) + sizeof(tag->hdr);
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tags_buffer.data = kmalloc(tags_buffer.size, GFP_KERNEL);
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if (tags_buffer.data == NULL)
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return -ENOMEM;
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memcpy(tags_buffer.data, atags_copy, tags_buffer.size);
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error = create_proc_entries();
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if (error) {
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printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
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kfree(tags_buffer.data);
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tags_buffer.size = 0;
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tags_buffer.data = NULL;
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}
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return error;
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}
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arch_initcall(init_atags_procfs);
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