diff options
Diffstat (limited to 'drivers/parisc/pdc_stable.c')
| -rw-r--r-- | drivers/parisc/pdc_stable.c | 219 |
1 files changed, 205 insertions, 14 deletions
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 */ |