+/**
+ * pdcs_autoboot_write - This function handles autoboot flag modifying.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The input buffer to read from.
+ * @count: The number of bytes to be read.
+ *
+ * We will call this function to change the current boot flags.
+ * We expect a precise syntax:
+ * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On
+ */
+static inline ssize_t
+pdcs_autoboot_write(struct subsystem *entry, const char *buf, size_t count)
+{
+ return pdcs_auto_write(entry, buf, count, PF_AUTOBOOT);
+}
+
+/**
+ * pdcs_autosearch_write - This function handles autosearch flag modifying.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The input buffer to read from.
+ * @count: The number of bytes to be read.
+ *
+ * We will call this function to change the current boot flags.
+ * We expect a precise syntax:
+ * \"n\" (n == 0 or 1) to toggle AutoSearch Off or On
+ */
+static inline ssize_t
+pdcs_autosearch_write(struct subsystem *entry, const char *buf, size_t count)
+{
+ return pdcs_auto_write(entry, buf, count, PF_AUTOSEARCH);
+}
+
+/**
+ * pdcs_osdep1_write - Stable Storage OS-Dependent data area 1 input.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The input buffer to read from.
+ * @count: The number of bytes to be read.
+ *
+ * This can store 16 bytes of OS-Dependent data. We use a byte-by-byte
+ * write approach. It's up to userspace to deal with it when constructing
+ * its input buffer.
+ */
+static ssize_t
+pdcs_osdep1_write(struct subsystem *entry, const char *buf, size_t count)
+{
+ u8 in[16];
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (!entry || !buf || !count)
+ return -EINVAL;
+
+ if (unlikely(pdcs_osid != OS_ID_LINUX))
+ return -EPERM;
+
+ if (count > 16)
+ return -EMSGSIZE;
+
+ /* We'll use a local copy of buf */
+ memset(in, 0, 16);
+ memcpy(in, buf, count);
+
+ if (pdc_stable_write(PDCS_ADDR_OSD1, &in, sizeof(in)) != PDC_OK)
+ return -EIO;
+
+ return count;
+}
+
+/**
+ * pdcs_osdep2_write - Stable Storage OS-Dependent data area 2 input.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The input buffer to read from.
+ * @count: The number of bytes to be read.
+ *
+ * This can store pdcs_size - 224 bytes of OS-Dependent data. We use a
+ * byte-by-byte write approach. It's up to userspace to deal with it when
+ * constructing its input buffer.
+ */
+static ssize_t
+pdcs_osdep2_write(struct subsystem *entry, const char *buf, size_t count)
+{
+ unsigned long size;
+ unsigned short i;
+ u8 in[4];
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (!entry || !buf || !count)
+ return -EINVAL;
+
+ if (unlikely(pdcs_size <= 224))
+ return -ENOSYS;
+
+ if (unlikely(pdcs_osid != OS_ID_LINUX))
+ return -EPERM;
+
+ size = pdcs_size - 224;
+
+ if (count > size)
+ return -EMSGSIZE;
+
+ /* We'll use a local copy of buf */
+
+ for (i=0; i<count; i+=4) {
+ memset(in, 0, 4);
+ memcpy(in, buf+i, (count-i < 4) ? count-i : 4);
+ if (unlikely(pdc_stable_write(PDCS_ADDR_OSD2 + i, &in,
+ sizeof(in)) != PDC_OK))
+ return -EIO;
+ }
+
+ return count;
+}
+
+/* The remaining attributes. */
+static PDCS_ATTR(size, 0444, pdcs_size_read, NULL);
+static PDCS_ATTR(autoboot, 0644, pdcs_autoboot_read, pdcs_autoboot_write);
+static PDCS_ATTR(autosearch, 0644, pdcs_autosearch_read, pdcs_autosearch_write);
+static PDCS_ATTR(timer, 0444, pdcs_timer_read, NULL);
+static PDCS_ATTR(osid, 0444, pdcs_osid_read, NULL);
+static PDCS_ATTR(osdep1, 0600, pdcs_osdep1_read, pdcs_osdep1_write);
+static PDCS_ATTR(diagnostic, 0400, pdcs_diagnostic_read, NULL);
+static PDCS_ATTR(fastsize, 0400, pdcs_fastsize_read, NULL);
+static PDCS_ATTR(osdep2, 0600, pdcs_osdep2_read, pdcs_osdep2_write);