2 files changed, 210 insertions, 14 deletions

diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index 4a36ec3f6ac1..8471486a7565 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -303,6 +303,8 @@ extern void eisa_init(void);
 
 static int __init parisc_init(void)
 {
+        u32 osid = (0x0006 << 16);
+
         parisc_proc_mkdir();
         parisc_init_resources();
         do_device_inventory();                  /* probe for hardware */
@@ -311,6 +313,9 @@ static int __init parisc_init(void)
         
         /* set up a new led state on systems shipped LED State panel */
         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
+
+        /* tell PDC we're Linux. Nevermind failure. */
+        pdc_stable_write(0x40, &osid, sizeof(osid));
         
         processor_init();
         printk(KERN_INFO "CPU(s): %d x %s at %d.%06d MHz\n",
diff --git a/drivers/parisc/pdc_stable.c b/drivers/parisc/pdc_stable.c
index bbeabe3fc4c6..4b991d50e578 100644
--- a/drivers/parisc/pdc_stable.c
+++ b/drivers/parisc/pdc_stable.c
@@ -28,8 +28,15 @@
  *    following code can deal with just 96 bytes of Stable Storage, and all
  *    sizes between 96 and 192 bytes (provided they are multiple of struct
  *    device_path size, eg: 128, 160 and 192) to provide full information.
- *    The code makes no use of data above 192 bytes. One last word: there's one
- *    path we can always count on: the primary path.
+ *    One last word: there's one path we can always count on: the primary path.
+ *    Anything above 224 bytes is used for 'osdep2' OS-dependent storage area.
+ *
+ *    The first OS-dependent area should always be available. Obviously, this is
+ *    not true for the other one. Also bear in mind that reading/writing from/to
+ *    osdep2 is much more expensive than from/to osdep1.
+ *    NOTE: We do not handle the 2 bytes OS-dep area at 0x5D, nor the first
+ *    2 bytes of storage available right after OSID. That's a total of 4 bytes
+ *    sacrificed: -ETOOLAZY :P
  *
  *    The current policy wrt file permissions is:
  *      - write: root only
@@ -64,15 +71,18 @@
 #include <asm/uaccess.h>
 #include <asm/hardware.h>
 
-#define PDCS_VERSION    "0.22"
+#define PDCS_VERSION    "0.30"
 #define PDCS_PREFIX     "PDC Stable Storage"
 
 #define PDCS_ADDR_PPRI  0x00
 #define PDCS_ADDR_OSID  0x40
+#define PDCS_ADDR_OSD1  0x48
+#define PDCS_ADDR_DIAG  0x58
 #define PDCS_ADDR_FSIZ  0x5C
 #define PDCS_ADDR_PCON  0x60
 #define PDCS_ADDR_PALT  0x80
 #define PDCS_ADDR_PKBD  0xA0
+#define PDCS_ADDR_OSD2  0xE0
 
 MODULE_AUTHOR("Thibaut VARENE <varenet@parisc-linux.org>");
 MODULE_DESCRIPTION("sysfs interface to HP PDC Stable Storage data");
@@ -82,6 +92,9 @@ MODULE_VERSION(PDCS_VERSION);
 /* holds Stable Storage size. Initialized once and for all, no lock needed */
 static unsigned long pdcs_size __read_mostly;
 
+/* holds OS ID. Initialized once and for all, hopefully to 0x0006 */
+static u16 pdcs_osid __read_mostly;
+
 /* This struct defines what we need to deal with a parisc pdc path entry */
 struct pdcspath_entry {
         rwlock_t rw_lock;               /* to protect path entry access */
@@ -609,27 +622,74 @@ static ssize_t
 pdcs_osid_read(struct subsystem *entry, char *buf)
 {
         char *out = buf;
-        __u32 result;
         char *tmpstr = NULL;
 
         if (!entry || !buf)
                 return -EINVAL;
 
-        /* get OSID */
-        if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK)
-                return -EIO;
-
-        /* the actual result is 16 bits away */
-        switch (result >> 16) {
+        switch (pdcs_osid) {
                 case 0x0000:    tmpstr = "No OS-dependent data"; break;
                 case 0x0001:    tmpstr = "HP-UX dependent data"; break;
                 case 0x0002:    tmpstr = "MPE-iX dependent data"; break;
                 case 0x0003:    tmpstr = "OSF dependent data"; break;
                 case 0x0004:    tmpstr = "HP-RT dependent data"; break;
                 case 0x0005:    tmpstr = "Novell Netware dependent data"; break;
+                case 0x0006:    tmpstr = "Linux dependent data"; break;
                 default:        tmpstr = "Unknown"; break;
         }
-        out += sprintf(out, "%s (0x%.4x)\n", tmpstr, (result >> 16));
+        out += sprintf(out, "%s (0x%.4x)\n", tmpstr, pdcs_osid);
+
+        return out - buf;
+}
+
+/**
+ * pdcs_osdep1_read - Stable Storage OS-Dependent data area 1 output.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The output buffer to write to.
+ *
+ * This can hold 16 bytes of OS-Dependent data.
+ */
+static ssize_t
+pdcs_osdep1_read(struct subsystem *entry, char *buf)
+{
+        char *out = buf;
+        u32 result[4];
+
+        if (!entry || !buf)
+                return -EINVAL;
+
+        if (pdc_stable_read(PDCS_ADDR_OSD1, &result, sizeof(result)) != PDC_OK)
+                return -EIO;
+
+        out += sprintf(out, "0x%.8x\n", result[0]);
+        out += sprintf(out, "0x%.8x\n", result[1]);
+        out += sprintf(out, "0x%.8x\n", result[2]);
+        out += sprintf(out, "0x%.8x\n", result[3]);
+
+        return out - buf;
+}
+
+/**
+ * pdcs_diagnostic_read - Stable Storage Diagnostic register output.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The output buffer to write to.
+ *
+ * I have NFC how to interpret the content of that register ;-).
+ */
+static ssize_t
+pdcs_diagnostic_read(struct subsystem *entry, char *buf)
+{
+        char *out = buf;
+        u32 result;
+
+        if (!entry || !buf)
+                return -EINVAL;
+
+        /* get diagnostic */
+        if (pdc_stable_read(PDCS_ADDR_DIAG, &result, sizeof(result)) != PDC_OK)
+                return -EIO;
+
+        out += sprintf(out, "0x%.4x\n", (result >> 16));
 
         return out - buf;
 }
@@ -645,7 +705,7 @@ static ssize_t
 pdcs_fastsize_read(struct subsystem *entry, char *buf)
 {
         char *out = buf;
-        __u32 result;
+        u32 result;
 
         if (!entry || !buf)
                 return -EINVAL;
@@ -664,6 +724,39 @@ pdcs_fastsize_read(struct subsystem *entry, char *buf)
 }
 
 /**
+ * pdcs_osdep2_read - Stable Storage OS-Dependent data area 2 output.
+ * @entry: An allocated and populated subsytem struct. We don't use it tho.
+ * @buf: The output buffer to write to.
+ *
+ * This can hold pdcs_size - 224 bytes of OS-Dependent data, when available.
+ */
+static ssize_t
+pdcs_osdep2_read(struct subsystem *entry, char *buf)
+{
+        char *out = buf;
+        unsigned long size;
+        unsigned short i;
+        u32 result;
+
+        if (unlikely(pdcs_size <= 224))
+                return -ENODATA;
+
+        size = pdcs_size - 224;
+
+        if (!entry || !buf)
+                return -EINVAL;
+
+        for (i=0; i<size; i+=4) {
+                if (unlikely(pdc_stable_read(PDCS_ADDR_OSD2 + i, &result,
+                                        sizeof(result)) != PDC_OK))
+                        return -EIO;
+                out += sprintf(out, "0x%.8x\n", result);
+        }
+
+        return out - buf;
+}
+
+/**
  * pdcs_auto_write - This function handles autoboot/search flag modifying.
  * @entry: An allocated and populated subsytem struct. We don't use it tho.
  * @buf: The input buffer to read from.
@@ -770,13 +863,100 @@ 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 != 0x0006))
+                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 != 0x0006))
+                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, 0400, pdcs_osid_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);
 
 static struct subsys_attribute *pdcs_subsys_attrs[] = {
         &pdcs_attr_size,
@@ -784,7 +964,10 @@ static struct subsys_attribute *pdcs_subsys_attrs[] = {
         &pdcs_attr_autosearch,
         &pdcs_attr_timer,
         &pdcs_attr_osid,
+        &pdcs_attr_osdep1,
+        &pdcs_attr_diagnostic,
         &pdcs_attr_fastsize,
+        &pdcs_attr_osdep2,
         NULL,
 };
 
@@ -865,6 +1048,7 @@ pdc_stable_init(void)
 {
         struct subsys_attribute *attr;
         int i, rc = 0, error = 0;
+        u32 result;
 
         /* find the size of the stable storage */
         if (pdc_stable_get_size(&pdcs_size) != PDC_OK) 
@@ -876,6 +1060,13 @@ pdc_stable_init(void)
 
         printk(KERN_INFO PDCS_PREFIX " facility v%s\n", PDCS_VERSION);
 
+        /* get OSID */
+        if (pdc_stable_read(PDCS_ADDR_OSID, &result, sizeof(result)) != PDC_OK)
+                return -EIO;
+
+        /* the actual result is 16 bits away */
+        pdcs_osid = (u16)(result >> 16);
+
         /* For now we'll register the stable subsys within this driver */
         if ((rc = firmware_register(&stable_subsys)))
                 goto fail_firmreg;
@@ -887,7 +1078,7 @@ pdc_stable_init(void)
         
         /* register the paths subsys as a subsystem of stable subsys */
         kset_set_kset_s(&paths_subsys, stable_subsys);
-        if ((rc= subsystem_register(&paths_subsys)))
+        if ((rc = subsystem_register(&paths_subsys)))
                 goto fail_subsysreg;
 
         /* now we create all "files" for the paths subsys */