aa783b6fd6
Make ATAGS parsing into a source file of its own, namely atags_parse.c. Also rename compat.c to atags_compat.c to make it clearer what it is about. Same for atags.c which is now atags_proc.c. Gather all the atags function declarations into a common atags.h. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
#include <linux/slab.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 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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#define BOOT_PARAMS_SIZE 1536
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static char __initdata atags_copy[BOOT_PARAMS_SIZE];
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void __init save_atags(const struct tag *tags)
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{
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memcpy(atags_copy, tags, sizeof(atags_copy));
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}
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static int __init init_atags_procfs(void)
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{
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/*
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* This cannot go into save_atags() because kmalloc and proc don't work
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* yet when it is called.
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*/
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struct proc_dir_entry *tags_entry;
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struct tag *tag = (struct tag *)atags_copy;
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struct buffer *b;
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size_t size;
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if (tag->hdr.tag != ATAG_CORE) {
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printk(KERN_INFO "No ATAGs?");
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return -EINVAL;
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}
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for (; tag->hdr.size; tag = tag_next(tag))
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;
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/* include the terminating ATAG_NONE */
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size = (char *)tag - atags_copy + sizeof(struct tag_header);
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WARN_ON(tag->hdr.tag != ATAG_NONE);
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b = kmalloc(sizeof(*b) + size, GFP_KERNEL);
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if (!b)
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goto nomem;
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b->size = size;
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memcpy(b->data, atags_copy, size);
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tags_entry = create_proc_read_entry("atags", 0400,
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NULL, read_buffer, b);
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if (!tags_entry)
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goto nomem;
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return 0;
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nomem:
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kfree(b);
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printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
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return -ENOMEM;
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}
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arch_initcall(init_atags_procfs);
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