diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/hpwdt.c | 203 |
1 files changed, 20 insertions, 183 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index b1cd0aca9b3..2686f3eaeed 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -58,41 +58,6 @@ struct bios32_service_dir { u8 reserved[5]; }; -/* - * smbios_entry_point - defines SMBIOS entry point structure - * - * anchor[4] - anchor string (_SM_) - * checksum - checksum of the entry point structure - * length - length of the entry point structure - * major_ver - major version (02h for revision 2.1) - * minor_ver - minor version (01h for revision 2.1) - * max_struct_size - size of the largest SMBIOS structure - * revision - entry point structure revision implemented - * formatted_area[5] - reserved - * intermediate_anchor[5] - intermediate anchor string (_DMI_) - * intermediate_checksum - intermediate checksum - * table_length - structure table length - * table_address - structure table address - * table_num_structs - number of SMBIOS structures present - * bcd_revision - BCD revision - */ -struct smbios_entry_point { - u8 anchor[4]; - u8 checksum; - u8 length; - u8 major_ver; - u8 minor_ver; - u16 max_struct_size; - u8 revision; - u8 formatted_area[5]; - u8 intermediate_anchor[5]; - u8 intermediate_checksum; - u16 table_length; - u32 table_address; - u16 table_num_structs; - u8 bcd_revision; -}; - /* type 212 */ struct smbios_cru64_info { u8 type; @@ -175,24 +140,6 @@ static struct pci_device_id hpwdt_devices[] = { }; MODULE_DEVICE_TABLE(pci, hpwdt_devices); -/* - * bios_checksum - */ -static int __devinit bios_checksum(const char __iomem *ptr, int len) -{ - char sum = 0; - int i; - - /* - * calculate checksum of size bytes. This should add up - * to zero if we have a valid header. - */ - for (i = 0; i < len; i++) - sum += ptr[i]; - - return ((sum == 0) && (len > 0)); -} - #ifndef CONFIG_X86_64 /* --32 Bit Bios------------------------------------------------------------ */ @@ -303,6 +250,24 @@ static int __devinit cru_detect(unsigned long map_entry, } /* + * bios_checksum + */ +static int __devinit bios_checksum(const char __iomem *ptr, int len) +{ + char sum = 0; + int i; + + /* + * calculate checksum of size bytes. This should add up + * to zero if we have a valid header. + */ + for (i = 0; i < len; i++) + sum += ptr[i]; + + return ((sum == 0) && (len > 0)); +} + +/* * bios32_present * * Routine Description: @@ -410,12 +375,8 @@ asmlinkage void asminline_call(struct cmn_registers *pi86Regs, * dmi_find_cru * * Routine Description: - * This function checks wether or not a SMBIOS/DMI record is + * This function checks whether or not a SMBIOS/DMI record is * the 64bit CRU info or not - * - * Return Value: - * 0 : SUCCESS - if record found - * <0 : FAILURE - if record not found */ static void __devinit dmi_find_cru(const struct dmi_header *dm) { @@ -434,135 +395,11 @@ static void __devinit dmi_find_cru(const struct dmi_header *dm) } } -/* - * dmi_table - * - * Routine Description: - * Decode the SMBIOS/DMI table and check if we have a 64bit CRU record - * or not. - * - * We have to be cautious here. We have seen BIOSes with DMI pointers - * pointing to completely the wrong place for example - */ -static void __devinit dmi_table(u8 *buf, int len, int num, - void (*decode)(const struct dmi_header *)) -{ - u8 *data = buf; - int i = 0; - - /* - * Stop when we see all the items the table claimed to have - * OR we run off the end of the table (also happens) - */ - while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { - const struct dmi_header *dm = (const struct dmi_header *)data; - - /* - * We want to know the total length (formated area and strings) - * before decoding to make sure we won't run off the table in - * dmi_decode or dmi_string - */ - data += dm->length; - while ((data - buf < len - 1) && (data[0] || data[1])) - data++; - if (data - buf < len - 1) - decode(dm); - data += 2; - i++; - } -} - -/* - * smbios_present - * - * Routine Description: - * This function parses the SMBIOS entry point table to retrieve - * the 64 bit CRU Service. - * - * Return Value: - * 0 : SUCCESS - * <0 : FAILURE - */ -static int __devinit smbios_present(const char __iomem *p) -{ - struct smbios_entry_point *eps = - (struct smbios_entry_point *) p; - int length; - u8 *buf; - - /* check if we have indeed the SMBIOS table entry point */ - if ((strncmp((char *)eps->anchor, "_SM_", - sizeof(eps->anchor))) == 0) { - length = eps->length; - - /* SMBIOS v2.1 implementation might use 0x1e */ - if ((length == 0x1e) && - (eps->major_ver == 2) && - (eps->minor_ver == 1)) - length = 0x1f; - - /* - * Now we will check: - * - SMBIOS checksum must be 0 - * - intermediate anchor should be _DMI_ - * - intermediate checksum should be 0 - */ - if ((bios_checksum(p, length)) && - (strncmp((char *)eps->intermediate_anchor, "_DMI_", - sizeof(eps->intermediate_anchor)) == 0) && - (bios_checksum(p+0x10, 15))) { - buf = ioremap(eps->table_address, eps->table_length); - if (buf == NULL) - return -ENODEV; - - - /* Scan the DMI table for the 64 bit CRU service */ - dmi_table(buf, eps->table_length, - eps->table_num_structs, dmi_find_cru); - - iounmap(buf); - return 0; - } - } - - return -ENODEV; -} - -static void __devinit smbios_scan_machine(void) -{ - char __iomem *p, *q; - - if (efi_enabled) { - if (efi.smbios == EFI_INVALID_TABLE_ADDR) - return; - - p = ioremap(efi.smbios, 32); - if (p == NULL) - return; - - smbios_present(p); - iounmap(p); - } else { - /* - * Search from 0x0f0000 through 0x0fffff, inclusive. - */ - p = ioremap(PCI_ROM_BASE1, ROM_SIZE); - if (p == NULL) - return; - - for (q = p; q < p + ROM_SIZE; q += 16) - if (!smbios_present(q)) - break; - - iounmap(p); - } -} - static int __devinit detect_cru_service(void) { cru_rom_addr = NULL; - smbios_scan_machine(); /* will become dmi_walk(dmi_find_cru); */ + dmi_walk(dmi_find_cru); /* if cru_rom_addr has been set then we found a CRU service */ return ((cru_rom_addr != NULL)? 0: -ENODEV); |