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