1 2 /* 3 * PARISC specific syscalls 4 * 5 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> 6 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> 7 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25 #include <asm/uaccess.h> 26 #include <linux/file.h> 27 #include <linux/fs.h> 28 #include <linux/linkage.h> 29 #include <linux/mm.h> 30 #include <linux/mman.h> 31 #include <linux/shm.h> 32 #include <linux/syscalls.h> 33 #include <linux/utsname.h> 34 #include <linux/personality.h> 35 36 static unsigned long get_unshared_area(unsigned long addr, unsigned long len) 37 { 38 struct vm_area_struct *vma; 39 40 addr = PAGE_ALIGN(addr); 41 42 for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { 43 /* At this point: (!vma || addr < vma->vm_end). */ 44 if (TASK_SIZE - len < addr) 45 return -ENOMEM; 46 if (!vma || addr + len <= vma->vm_start) 47 return addr; 48 addr = vma->vm_end; 49 } 50 } 51 52 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1)) 53 54 /* 55 * We need to know the offset to use. Old scheme was to look for 56 * existing mapping and use the same offset. New scheme is to use the 57 * address of the kernel data structure as the seed for the offset. 58 * We'll see how that works... 59 * 60 * The mapping is cacheline aligned, so there's no information in the bottom 61 * few bits of the address. We're looking for 10 bits (4MB / 4k), so let's 62 * drop the bottom 8 bits and use bits 8-17. 63 */ 64 static int get_offset(struct address_space *mapping) 65 { 66 int offset = (unsigned long) mapping << (PAGE_SHIFT - 8); 67 return offset & 0x3FF000; 68 } 69 70 static unsigned long get_shared_area(struct address_space *mapping, 71 unsigned long addr, unsigned long len, unsigned long pgoff) 72 { 73 struct vm_area_struct *vma; 74 int offset = mapping ? get_offset(mapping) : 0; 75 76 offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000; 77 78 addr = DCACHE_ALIGN(addr - offset) + offset; 79 80 for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { 81 /* At this point: (!vma || addr < vma->vm_end). */ 82 if (TASK_SIZE - len < addr) 83 return -ENOMEM; 84 if (!vma || addr + len <= vma->vm_start) 85 return addr; 86 addr = DCACHE_ALIGN(vma->vm_end - offset) + offset; 87 if (addr < vma->vm_end) /* handle wraparound */ 88 return -ENOMEM; 89 } 90 } 91 92 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 93 unsigned long len, unsigned long pgoff, unsigned long flags) 94 { 95 if (len > TASK_SIZE) 96 return -ENOMEM; 97 /* Might want to check for cache aliasing issues for MAP_FIXED case 98 * like ARM or MIPS ??? --BenH. 99 */ 100 if (flags & MAP_FIXED) 101 return addr; 102 if (!addr) 103 addr = TASK_UNMAPPED_BASE; 104 105 if (filp) { 106 addr = get_shared_area(filp->f_mapping, addr, len, pgoff); 107 } else if(flags & MAP_SHARED) { 108 addr = get_shared_area(NULL, addr, len, pgoff); 109 } else { 110 addr = get_unshared_area(addr, len); 111 } 112 return addr; 113 } 114 115 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 116 unsigned long prot, unsigned long flags, unsigned long fd, 117 unsigned long pgoff) 118 { 119 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 120 we have. */ 121 return sys_mmap_pgoff(addr, len, prot, flags, fd, 122 pgoff >> (PAGE_SHIFT - 12)); 123 } 124 125 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 126 unsigned long prot, unsigned long flags, unsigned long fd, 127 unsigned long offset) 128 { 129 if (!(offset & ~PAGE_MASK)) { 130 return sys_mmap_pgoff(addr, len, prot, flags, fd, 131 offset >> PAGE_SHIFT); 132 } else { 133 return -EINVAL; 134 } 135 } 136 137 /* Fucking broken ABI */ 138 139 #ifdef CONFIG_64BIT 140 asmlinkage long parisc_truncate64(const char __user * path, 141 unsigned int high, unsigned int low) 142 { 143 return sys_truncate(path, (long)high << 32 | low); 144 } 145 146 asmlinkage long parisc_ftruncate64(unsigned int fd, 147 unsigned int high, unsigned int low) 148 { 149 return sys_ftruncate(fd, (long)high << 32 | low); 150 } 151 152 /* stubs for the benefit of the syscall_table since truncate64 and truncate 153 * are identical on LP64 */ 154 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 155 { 156 return sys_truncate(path, length); 157 } 158 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 159 { 160 return sys_ftruncate(fd, length); 161 } 162 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 163 { 164 return sys_fcntl(fd, cmd, arg); 165 } 166 #else 167 168 asmlinkage long parisc_truncate64(const char __user * path, 169 unsigned int high, unsigned int low) 170 { 171 return sys_truncate64(path, (loff_t)high << 32 | low); 172 } 173 174 asmlinkage long parisc_ftruncate64(unsigned int fd, 175 unsigned int high, unsigned int low) 176 { 177 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 178 } 179 #endif 180 181 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 182 unsigned int high, unsigned int low) 183 { 184 return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); 185 } 186 187 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 188 size_t count, unsigned int high, unsigned int low) 189 { 190 return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 191 } 192 193 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 194 size_t count) 195 { 196 return sys_readahead(fd, (loff_t)high << 32 | low, count); 197 } 198 199 asmlinkage long parisc_fadvise64_64(int fd, 200 unsigned int high_off, unsigned int low_off, 201 unsigned int high_len, unsigned int low_len, int advice) 202 { 203 return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 204 (loff_t)high_len << 32 | low_len, advice); 205 } 206 207 asmlinkage long parisc_sync_file_range(int fd, 208 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 209 unsigned int flags) 210 { 211 return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 212 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 213 } 214 215 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag) 216 { 217 return -ENOMEM; 218 } 219 220 asmlinkage int sys_free_hugepages(unsigned long addr) 221 { 222 return -EINVAL; 223 } 224 225 long parisc_personality(unsigned long personality) 226 { 227 long err; 228 229 if (personality(current->personality) == PER_LINUX32 230 && personality(personality) == PER_LINUX) 231 personality = (personality & ~PER_MASK) | PER_LINUX32; 232 233 err = sys_personality(personality); 234 if (personality(err) == PER_LINUX32) 235 err = (err & ~PER_MASK) | PER_LINUX; 236 237 return err; 238 } 239