James Hogan | 26025bb | 2012-10-09 10:54:51 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This file contains various random system calls that |
| 3 | * have a non-standard calling sequence on the Linux/Meta |
| 4 | * platform. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/errno.h> |
| 8 | #include <linux/sched.h> |
| 9 | #include <linux/mm.h> |
| 10 | #include <linux/syscalls.h> |
| 11 | #include <linux/mman.h> |
| 12 | #include <linux/file.h> |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/uaccess.h> |
| 15 | #include <linux/unistd.h> |
| 16 | #include <asm/cacheflush.h> |
| 17 | #include <asm/core_reg.h> |
| 18 | #include <asm/global_lock.h> |
| 19 | #include <asm/switch.h> |
| 20 | #include <asm/syscall.h> |
| 21 | #include <asm/syscalls.h> |
| 22 | #include <asm/user_gateway.h> |
| 23 | |
| 24 | #define merge_64(hi, lo) ((((unsigned long long)(hi)) << 32) + \ |
| 25 | ((lo) & 0xffffffffUL)) |
| 26 | |
| 27 | int metag_mmap_check(unsigned long addr, unsigned long len, |
| 28 | unsigned long flags) |
| 29 | { |
| 30 | /* We can't have people trying to write to the bottom of the |
| 31 | * memory map, there are mysterious unspecified things there that |
| 32 | * we don't want people trampling on. |
| 33 | */ |
| 34 | if ((flags & MAP_FIXED) && (addr < TASK_UNMAPPED_BASE)) |
| 35 | return -EINVAL; |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, |
| 41 | unsigned long prot, unsigned long flags, |
| 42 | unsigned long fd, unsigned long pgoff) |
| 43 | { |
| 44 | /* The shift for mmap2 is constant, regardless of PAGE_SIZE setting. */ |
| 45 | if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1)) |
| 46 | return -EINVAL; |
| 47 | |
| 48 | pgoff >>= PAGE_SHIFT - 12; |
| 49 | |
| 50 | return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); |
| 51 | } |
| 52 | |
| 53 | asmlinkage int sys_metag_setglobalbit(char __user *addr, int mask) |
| 54 | { |
| 55 | char tmp; |
| 56 | int ret = 0; |
| 57 | unsigned int flags; |
| 58 | |
| 59 | if (!((__force unsigned int)addr >= LINCORE_BASE)) |
| 60 | return -EFAULT; |
| 61 | |
| 62 | __global_lock2(flags); |
| 63 | |
| 64 | metag_data_cache_flush((__force void *)addr, sizeof(mask)); |
| 65 | |
| 66 | ret = __get_user(tmp, addr); |
| 67 | if (ret) |
| 68 | goto out; |
| 69 | tmp |= mask; |
| 70 | ret = __put_user(tmp, addr); |
| 71 | |
| 72 | metag_data_cache_flush((__force void *)addr, sizeof(mask)); |
| 73 | |
| 74 | out: |
| 75 | __global_unlock2(flags); |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | #define TXDEFR_FPU_MASK ((0x1f << 16) | 0x1f) |
| 81 | |
| 82 | asmlinkage void sys_metag_set_fpu_flags(unsigned int flags) |
| 83 | { |
| 84 | unsigned int temp; |
| 85 | |
| 86 | flags &= TXDEFR_FPU_MASK; |
| 87 | |
| 88 | temp = __core_reg_get(TXDEFR); |
| 89 | temp &= ~TXDEFR_FPU_MASK; |
| 90 | temp |= flags; |
| 91 | __core_reg_set(TXDEFR, temp); |
| 92 | } |
| 93 | |
| 94 | asmlinkage int sys_metag_set_tls(void __user *ptr) |
| 95 | { |
| 96 | current->thread.tls_ptr = ptr; |
| 97 | set_gateway_tls(ptr); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | asmlinkage void *sys_metag_get_tls(void) |
| 103 | { |
| 104 | return (__force void *)current->thread.tls_ptr; |
| 105 | } |
| 106 | |
| 107 | asmlinkage long sys_truncate64_metag(const char __user *path, unsigned long lo, |
| 108 | unsigned long hi) |
| 109 | { |
| 110 | return sys_truncate64(path, merge_64(hi, lo)); |
| 111 | } |
| 112 | |
| 113 | asmlinkage long sys_ftruncate64_metag(unsigned int fd, unsigned long lo, |
| 114 | unsigned long hi) |
| 115 | { |
| 116 | return sys_ftruncate64(fd, merge_64(hi, lo)); |
| 117 | } |
| 118 | |
| 119 | asmlinkage long sys_fadvise64_64_metag(int fd, unsigned long offs_lo, |
| 120 | unsigned long offs_hi, |
| 121 | unsigned long len_lo, |
| 122 | unsigned long len_hi, int advice) |
| 123 | { |
| 124 | return sys_fadvise64_64(fd, merge_64(offs_hi, offs_lo), |
| 125 | merge_64(len_hi, len_lo), advice); |
| 126 | } |
| 127 | |
| 128 | asmlinkage long sys_readahead_metag(int fd, unsigned long lo, unsigned long hi, |
| 129 | size_t count) |
| 130 | { |
| 131 | return sys_readahead(fd, merge_64(hi, lo), count); |
| 132 | } |
| 133 | |
| 134 | asmlinkage ssize_t sys_pread64_metag(unsigned long fd, char __user *buf, |
| 135 | size_t count, unsigned long lo, |
| 136 | unsigned long hi) |
| 137 | { |
| 138 | return sys_pread64(fd, buf, count, merge_64(hi, lo)); |
| 139 | } |
| 140 | |
| 141 | asmlinkage ssize_t sys_pwrite64_metag(unsigned long fd, char __user *buf, |
| 142 | size_t count, unsigned long lo, |
| 143 | unsigned long hi) |
| 144 | { |
| 145 | return sys_pwrite64(fd, buf, count, merge_64(hi, lo)); |
| 146 | } |
| 147 | |
| 148 | asmlinkage long sys_sync_file_range_metag(int fd, unsigned long offs_lo, |
| 149 | unsigned long offs_hi, |
| 150 | unsigned long len_lo, |
| 151 | unsigned long len_hi, |
| 152 | unsigned int flags) |
| 153 | { |
| 154 | return sys_sync_file_range(fd, merge_64(offs_hi, offs_lo), |
| 155 | merge_64(len_hi, len_lo), flags); |
| 156 | } |
| 157 | |
| 158 | /* Provide the actual syscall number to call mapping. */ |
| 159 | #undef __SYSCALL |
| 160 | #define __SYSCALL(nr, call) [nr] = (call), |
| 161 | |
| 162 | /* |
| 163 | * We need wrappers for anything with unaligned 64bit arguments |
| 164 | */ |
| 165 | #define sys_truncate64 sys_truncate64_metag |
| 166 | #define sys_ftruncate64 sys_ftruncate64_metag |
| 167 | #define sys_fadvise64_64 sys_fadvise64_64_metag |
| 168 | #define sys_readahead sys_readahead_metag |
| 169 | #define sys_pread64 sys_pread64_metag |
| 170 | #define sys_pwrite64 sys_pwrite64_metag |
| 171 | #define sys_sync_file_range sys_sync_file_range_metag |
| 172 | |
| 173 | /* |
| 174 | * Note that we can't include <linux/unistd.h> here since the header |
| 175 | * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well. |
| 176 | */ |
| 177 | const void *sys_call_table[__NR_syscalls] = { |
| 178 | [0 ... __NR_syscalls-1] = sys_ni_syscall, |
| 179 | #include <asm/unistd.h> |
| 180 | }; |