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author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2012-09-01 03:00:15 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-03 22:55:56 +0100 |
commit | aa783b6fd60b3844e199b1c2d2f4068f3caa1358 (patch) | |
tree | 393501d8ef825c12a18314981ca20f75120c79c3 /arch/arm/kernel/atags_proc.c | |
parent | 4cbe5a555fa58a79b6ecbb6c531b8bab0650778d (diff) | |
download | linux-aa783b6fd60b3844e199b1c2d2f4068f3caa1358.tar.bz2 |
ARM: 7505/1: split out ATAGS parsing
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>
Diffstat (limited to 'arch/arm/kernel/atags_proc.c')
-rw-r--r-- | arch/arm/kernel/atags_proc.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/kernel/atags_proc.c b/arch/arm/kernel/atags_proc.c new file mode 100644 index 000000000000..42a1a1415fa6 --- /dev/null +++ b/arch/arm/kernel/atags_proc.c @@ -0,0 +1,83 @@ +#include <linux/slab.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 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; +} + +#define BOOT_PARAMS_SIZE 1536 +static char __initdata atags_copy[BOOT_PARAMS_SIZE]; + +void __init save_atags(const struct tag *tags) +{ + memcpy(atags_copy, tags, sizeof(atags_copy)); +} + +static int __init init_atags_procfs(void) +{ + /* + * This cannot go into save_atags() because kmalloc and proc don't work + * yet when it is called. + */ + struct proc_dir_entry *tags_entry; + struct tag *tag = (struct tag *)atags_copy; + struct buffer *b; + size_t size; + + if (tag->hdr.tag != ATAG_CORE) { + printk(KERN_INFO "No ATAGs?"); + return -EINVAL; + } + + for (; tag->hdr.size; tag = tag_next(tag)) + ; + + /* include the terminating ATAG_NONE */ + size = (char *)tag - atags_copy + sizeof(struct tag_header); + + WARN_ON(tag->hdr.tag != ATAG_NONE); + + b = kmalloc(sizeof(*b) + size, GFP_KERNEL); + if (!b) + goto nomem; + + b->size = size; + memcpy(b->data, atags_copy, size); + + tags_entry = create_proc_read_entry("atags", 0400, + NULL, read_buffer, b); + + if (!tags_entry) + goto nomem; + + return 0; + +nomem: + kfree(b); + printk(KERN_ERR "Exporting ATAGs: not enough memory\n"); + + return -ENOMEM; +} +arch_initcall(init_atags_procfs); |