^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * /proc/bootconfig - Extra boot configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/bootconfig.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static char *saved_boot_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static int boot_config_proc_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) if (saved_boot_config)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) seq_puts(m, saved_boot_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Rest size of buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Return the needed total length if @size is 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int __init copy_xbc_key_value_list(char *dst, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct xbc_node *leaf, *vnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) char *key, *end = dst + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) const char *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) char q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (!key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) xbc_for_each_key_value(leaf, val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) ret = snprintf(dst, rest(dst, end), "%s = ", key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) dst += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) vnode = xbc_node_get_child(leaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (vnode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) xbc_array_for_each_value(vnode, val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (strchr(val, '"'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) q = '\'';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) q = '"';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ret = snprintf(dst, rest(dst, end), "%c%s%c%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) q, val, q, xbc_node_is_array(vnode) ? ", " : "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) dst += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ret = snprintf(dst, rest(dst, end), "\"\"\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dst += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) kfree(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return ret < 0 ? ret : dst - (end - size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int __init proc_boot_config_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) len = copy_xbc_key_value_list(NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) saved_boot_config = kzalloc(len + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (!saved_boot_config)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) len = copy_xbc_key_value_list(saved_boot_config, len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) kfree(saved_boot_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) proc_create_single("bootconfig", 0, NULL, boot_config_proc_show);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) fs_initcall(proc_boot_config_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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