/*****************************************************************************\ * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. * Copyright (C) 2007 The Regents of the University of California. * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). * Written by Brian Behlendorf . * UCRL-CODE-235197 * * This file is part of the SPL, Solaris Porting Layer. * For details, see . * * The SPL is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * The SPL is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with the SPL. If not, see . ***************************************************************************** * Solaris Porting Layer (SPL) Generic Implementation. \*****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include char spl_version[32] = "SPL v" SPL_META_VERSION "-" SPL_META_RELEASE; EXPORT_SYMBOL(spl_version); unsigned long spl_hostid = 0; EXPORT_SYMBOL(spl_hostid); module_param(spl_hostid, ulong, 0644); MODULE_PARM_DESC(spl_hostid, "The system hostid."); proc_t p0 = { 0 }; EXPORT_SYMBOL(p0); #if BITS_PER_LONG == 32 /* * Support 64/64 => 64 division on a 32-bit platform. While the kernel * provides a div64_u64() function for this we do not use it because the * implementation is flawed. There are cases which return incorrect * results as late as linux-2.6.35. Until this is fixed upstream the * spl must provide its own implementation. * * This implementation is a slightly modified version of the algorithm * proposed by the book 'Hacker's Delight'. The original source can be * found here and is available for use without restriction. * * http://www.hackersdelight.org/HDcode/newCode/divDouble.c */ /* * Calculate number of leading of zeros for a 64-bit value. */ static int nlz64(uint64_t x) { register int n = 0; if (x == 0) return 64; if (x <= 0x00000000FFFFFFFFULL) {n = n + 32; x = x << 32;} if (x <= 0x0000FFFFFFFFFFFFULL) {n = n + 16; x = x << 16;} if (x <= 0x00FFFFFFFFFFFFFFULL) {n = n + 8; x = x << 8;} if (x <= 0x0FFFFFFFFFFFFFFFULL) {n = n + 4; x = x << 4;} if (x <= 0x3FFFFFFFFFFFFFFFULL) {n = n + 2; x = x << 2;} if (x <= 0x7FFFFFFFFFFFFFFFULL) {n = n + 1;} return n; } /* * Newer kernels have a div_u64() function but we define our own * to simplify portibility between kernel versions. */ static inline uint64_t __div_u64(uint64_t u, uint32_t v) { (void) do_div(u, v); return u; } /* * Implementation of 64-bit unsigned division for 32-bit machines. * * First the procedure takes care of the case in which the divisor is a * 32-bit quantity. There are two subcases: (1) If the left half of the * dividend is less than the divisor, one execution of do_div() is all that * is required (overflow is not possible). (2) Otherwise it does two * divisions, using the grade school method. */ uint64_t __udivdi3(uint64_t u, uint64_t v) { uint64_t u0, u1, v1, q0, q1, k; int n; if (v >> 32 == 0) { // If v < 2**32: if (u >> 32 < v) { // If u/v cannot overflow, return __div_u64(u, v); // just do one division. } else { // If u/v would overflow: u1 = u >> 32; // Break u into two halves. u0 = u & 0xFFFFFFFF; q1 = __div_u64(u1, v); // First quotient digit. k = u1 - q1 * v; // First remainder, < v. u0 += (k << 32); q0 = __div_u64(u0, v); // Seconds quotient digit. return (q1 << 32) + q0; } } else { // If v >= 2**32: n = nlz64(v); // 0 <= n <= 31. v1 = (v << n) >> 32; // Normalize divisor, MSB is 1. u1 = u >> 1; // To ensure no overflow. q1 = __div_u64(u1, v1); // Get quotient from q0 = (q1 << n) >> 31; // Undo normalization and // division of u by 2. if (q0 != 0) // Make q0 correct or q0 = q0 - 1; // too small by 1. if ((u - q0 * v) >= v) q0 = q0 + 1; // Now q0 is correct. return q0; } } EXPORT_SYMBOL(__udivdi3); /* * Implementation of 64-bit signed division for 32-bit machines. */ int64_t __divdi3(int64_t u, int64_t v) { int64_t q, t; q = __udivdi3(abs64(u), abs64(v)); t = (u ^ v) >> 63; // If u, v have different return (q ^ t) - t; // signs, negate q. } EXPORT_SYMBOL(__divdi3); /* * Implementation of 64-bit unsigned modulo for 32-bit machines. */ uint64_t __umoddi3(uint64_t dividend, uint64_t divisor) { return (dividend - (divisor * __udivdi3(dividend, divisor))); } EXPORT_SYMBOL(__umoddi3); #if defined(__arm) || defined(__arm__) /* * Implementation of 64-bit (un)signed division for 32-bit arm machines. * * Run-time ABI for the ARM Architecture (page 20). A pair of (unsigned) * long longs is returned in {{r0, r1}, {r2,r3}}, the quotient in {r0, r1}, * and the remainder in {r2, r3}. The return type is specifically left * set to 'void' to ensure the compiler does not overwrite these registers * during the return. All results are in registers as per ABI */ void __aeabi_uldivmod(uint64_t u, uint64_t v) { uint64_t res; uint64_t mod; res = __udivdi3(u, v); mod = __umoddi3(u, v); { register uint32_t r0 asm("r0") = (res & 0xFFFFFFFF); register uint32_t r1 asm("r1") = (res >> 32); register uint32_t r2 asm("r2") = (mod & 0xFFFFFFFF); register uint32_t r3 asm("r3") = (mod >> 32); asm volatile("" : "+r"(r0), "+r"(r1), "+r"(r2),"+r"(r3) /* output */ : "r"(r0), "r"(r1), "r"(r2), "r"(r3)); /* input */ return; /* r0; */ } } EXPORT_SYMBOL(__aeabi_uldivmod); void __aeabi_ldivmod(int64_t u, int64_t v) { int64_t res; uint64_t mod; res = __divdi3(u, v); mod = __umoddi3(u, v); { register uint32_t r0 asm("r0") = (res & 0xFFFFFFFF); register uint32_t r1 asm("r1") = (res >> 32); register uint32_t r2 asm("r2") = (mod & 0xFFFFFFFF); register uint32_t r3 asm("r3") = (mod >> 32); asm volatile("" : "+r"(r0), "+r"(r1), "+r"(r2),"+r"(r3) /* output */ : "r"(r0), "r"(r1), "r"(r2), "r"(r3)); /* input */ return; /* r0; */ } } EXPORT_SYMBOL(__aeabi_ldivmod); #endif /* __arm || __arm__ */ #endif /* BITS_PER_LONG */ /* NOTE: The strtoxx behavior is solely based on my reading of the Solaris * ddi_strtol(9F) man page. I have not verified the behavior of these * functions against their Solaris counterparts. It is possible that I * may have misinterpreted the man page or the man page is incorrect. */ int ddi_strtoul(const char *, char **, int, unsigned long *); int ddi_strtol(const char *, char **, int, long *); int ddi_strtoull(const char *, char **, int, unsigned long long *); int ddi_strtoll(const char *, char **, int, long long *); #define define_ddi_strtoux(type, valtype) \ int ddi_strtou##type(const char *str, char **endptr, \ int base, valtype *result) \ { \ valtype last_value, value = 0; \ char *ptr = (char *)str; \ int flag = 1, digit; \ \ if (strlen(ptr) == 0) \ return EINVAL; \ \ /* Auto-detect base based on prefix */ \ if (!base) { \ if (str[0] == '0') { \ if (tolower(str[1])=='x' && isxdigit(str[2])) { \ base = 16; /* hex */ \ ptr += 2; \ } else if (str[1] >= '0' && str[1] < 8) { \ base = 8; /* octal */ \ ptr += 1; \ } else { \ return EINVAL; \ } \ } else { \ base = 10; /* decimal */ \ } \ } \ \ while (1) { \ if (isdigit(*ptr)) \ digit = *ptr - '0'; \ else if (isalpha(*ptr)) \ digit = tolower(*ptr) - 'a' + 10; \ else \ break; \ \ if (digit >= base) \ break; \ \ last_value = value; \ value = value * base + digit; \ if (last_value > value) /* Overflow */ \ return ERANGE; \ \ flag = 1; \ ptr++; \ } \ \ if (flag) \ *result = value; \ \ if (endptr) \ *endptr = (char *)(flag ? ptr : str); \ \ return 0; \ } \ #define define_ddi_strtox(type, valtype) \ int ddi_strto##type(const char *str, char **endptr, \ int base, valtype *result) \ { \ int rc; \ \ if (*str == '-') { \ rc = ddi_strtou##type(str + 1, endptr, base, result); \ if (!rc) { \ if (*endptr == str + 1) \ *endptr = (char *)str; \ else \ *result = -*result; \ } \ } else { \ rc = ddi_strtou##type(str, endptr, base, result); \ } \ \ return rc; \ } define_ddi_strtoux(l, unsigned long) define_ddi_strtox(l, long) define_ddi_strtoux(ll, unsigned long long) define_ddi_strtox(ll, long long) EXPORT_SYMBOL(ddi_strtoul); EXPORT_SYMBOL(ddi_strtol); EXPORT_SYMBOL(ddi_strtoll); EXPORT_SYMBOL(ddi_strtoull); int ddi_copyin(const void *from, void *to, size_t len, int flags) { /* Fake ioctl() issued by kernel, 'from' is a kernel address */ if (flags & FKIOCTL) { memcpy(to, from, len); return 0; } return copyin(from, to, len); } EXPORT_SYMBOL(ddi_copyin); int ddi_copyout(const void *from, void *to, size_t len, int flags) { /* Fake ioctl() issued by kernel, 'from' is a kernel address */ if (flags & FKIOCTL) { memcpy(to, from, len); return 0; } return copyout(from, to, len); } EXPORT_SYMBOL(ddi_copyout); #ifndef HAVE_PUT_TASK_STRUCT /* * This is only a stub function which should never be used. The SPL should * never be putting away the last reference on a task structure so this will * not be called. However, we still need to define it so the module does not * have undefined symbol at load time. That all said if this impossible * thing does somehow happen PANIC immediately so we know about it. */ void __put_task_struct(struct task_struct *t) { PANIC("Unexpectly put last reference on task %d\n", (int)t->pid); } EXPORT_SYMBOL(__put_task_struct); #endif /* HAVE_PUT_TASK_STRUCT */ /* * Read the unique system identifier from the /etc/hostid file. * * The behavior of /usr/bin/hostid on Linux systems with the * regular eglibc and coreutils is: * * 1. Generate the value if the /etc/hostid file does not exist * or if the /etc/hostid file is less than four bytes in size. * * 2. If the /etc/hostid file is at least 4 bytes, then return * the first four bytes [0..3] in native endian order. * * 3. Always ignore bytes [4..] if they exist in the file. * * Only the first four bytes are significant, even on systems that * have a 64-bit word size. * * See: * * eglibc: sysdeps/unix/sysv/linux/gethostid.c * coreutils: src/hostid.c * * Notes: * * The /etc/hostid file on Solaris is a text file that often reads: * * # DO NOT EDIT * "0123456789" * * Directly copying this file to Linux results in a constant * hostid of 4f442023 because the default comment constitutes * the first four bytes of the file. * */ char *spl_hostid_path = HW_HOSTID_PATH; module_param(spl_hostid_path, charp, 0444); MODULE_PARM_DESC(spl_hostid_path, "The system hostid file (/etc/hostid)"); static int hostid_read(void) { int result; uint64_t size; struct _buf *file; uint32_t hostid = 0; file = kobj_open_file(spl_hostid_path); if (file == (struct _buf *)-1) return -1; result = kobj_get_filesize(file, &size); if (result != 0) { printk(KERN_WARNING "SPL: kobj_get_filesize returned %i on %s\n", result, spl_hostid_path); kobj_close_file(file); return -2; } if (size < sizeof(HW_HOSTID_MASK)) { printk(KERN_WARNING "SPL: Ignoring the %s file because it is %llu bytes; " "expecting %lu bytes instead.\n", spl_hostid_path, size, (unsigned long)sizeof(HW_HOSTID_MASK)); kobj_close_file(file); return -3; } /* Read directly into the variable like eglibc does. */ /* Short reads are okay; native behavior is preserved. */ result = kobj_read_file(file, (char *)&hostid, sizeof(hostid), 0); if (result < 0) { printk(KERN_WARNING "SPL: kobj_read_file returned %i on %s\n", result, spl_hostid_path); kobj_close_file(file); return -4; } /* Mask down to 32 bits like coreutils does. */ spl_hostid = hostid & HW_HOSTID_MASK; kobj_close_file(file); return 0; } uint32_t zone_get_hostid(void *zone) { static int first = 1; /* Only the global zone is supported */ ASSERT(zone == NULL); if (first) { first = 0; /* * Get the hostid if it was not passed as a module parameter. * Try reading the /etc/hostid file directly. */ if (hostid_read()) spl_hostid = 0; printk(KERN_NOTICE "SPL: using hostid 0x%08x\n", (unsigned int) spl_hostid); } return spl_hostid; } EXPORT_SYMBOL(zone_get_hostid); static int __init spl_init(void) { int rc = 0; if ((rc = spl_kmem_init())) goto out1; if ((rc = spl_mutex_init())) goto out2; if ((rc = spl_rw_init())) goto out3; if ((rc = spl_taskq_init())) goto out4; if ((rc = spl_vn_init())) goto out5; if ((rc = spl_proc_init())) goto out6; if ((rc = spl_kstat_init())) goto out7; if ((rc = spl_tsd_init())) goto out8; if ((rc = spl_zlib_init())) goto out9; printk(KERN_NOTICE "SPL: Loaded module v%s-%s%s\n", SPL_META_VERSION, SPL_META_RELEASE, SPL_DEBUG_STR); return (rc); out9: spl_tsd_fini(); out8: spl_kstat_fini(); out7: spl_proc_fini(); out6: spl_vn_fini(); out5: spl_taskq_fini(); out4: spl_rw_fini(); out3: spl_mutex_fini(); out2: spl_kmem_fini(); out1: printk(KERN_NOTICE "SPL: Failed to Load Solaris Porting Layer " "v%s-%s%s, rc = %d\n", SPL_META_VERSION, SPL_META_RELEASE, SPL_DEBUG_STR, rc); return rc; } static void spl_fini(void) { printk(KERN_NOTICE "SPL: Unloaded module v%s-%s%s\n", SPL_META_VERSION, SPL_META_RELEASE, SPL_DEBUG_STR); spl_zlib_fini(); spl_tsd_fini(); spl_kstat_fini(); spl_proc_fini(); spl_vn_fini(); spl_taskq_fini(); spl_rw_fini(); spl_mutex_fini(); spl_kmem_fini(); } /* Called when a dependent module is loaded */ void spl_setup(void) { int rc; /* * At module load time the pwd is set to '/' on a Solaris system. * On a Linux system will be set to whatever directory the caller * was in when executing insmod/modprobe. */ rc = vn_set_pwd("/"); if (rc) printk("SPL: Warning unable to set pwd to '/': %d\n", rc); } EXPORT_SYMBOL(spl_setup); /* Called when a dependent module is unloaded */ void spl_cleanup(void) { } EXPORT_SYMBOL(spl_cleanup); module_init(spl_init); module_exit(spl_fini); MODULE_DESCRIPTION("Solaris Porting Layer"); MODULE_AUTHOR(SPL_META_AUTHOR); MODULE_LICENSE(SPL_META_LICENSE); MODULE_VERSION(SPL_META_VERSION "-" SPL_META_RELEASE);