Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/kernel/sys_m32r.c | |
3 | * | |
4 | * This file contains various random system calls that | |
5 | * have a non-standard calling sequence on the Linux/M32R platform. | |
6 | * | |
7 | * Taken from i386 version. | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/errno.h> |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
cfcd8c4f | 13 | #include <linux/fs.h> |
1da177e4 | 14 | #include <linux/smp.h> |
1da177e4 LT |
15 | #include <linux/sem.h> |
16 | #include <linux/msg.h> | |
17 | #include <linux/shm.h> | |
18 | #include <linux/stat.h> | |
19 | #include <linux/syscalls.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/utsname.h> | |
cba4fbbf | 23 | #include <linux/ipc.h> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/cachectl.h> | |
27 | #include <asm/cacheflush.h> | |
fe74290d AB |
28 | #include <asm/syscall.h> |
29 | #include <asm/unistd.h> | |
1da177e4 LT |
30 | |
31 | /* | |
32 | * sys_tas() - test-and-set | |
1da177e4 | 33 | */ |
fd2c903b | 34 | asmlinkage int sys_tas(int __user *addr) |
1da177e4 LT |
35 | { |
36 | int oldval; | |
37 | ||
38 | if (!access_ok(VERIFY_WRITE, addr, sizeof (int))) | |
39 | return -EFAULT; | |
40 | ||
cf535ea5 HT |
41 | /* atomic operation: |
42 | * oldval = *addr; *addr = 1; | |
43 | */ | |
44 | __asm__ __volatile__ ( | |
45 | DCACHE_CLEAR("%0", "r4", "%1") | |
46 | " .fillinsn\n" | |
47 | "1:\n" | |
48 | " lock %0, @%1 -> unlock %2, @%1\n" | |
49 | "2:\n" | |
50 | /* NOTE: | |
51 | * The m32r processor can accept interrupts only | |
52 | * at the 32-bit instruction boundary. | |
53 | * So, in the above code, the "unlock" instruction | |
54 | * can be executed continuously after the "lock" | |
55 | * instruction execution without any interruptions. | |
56 | */ | |
57 | ".section .fixup,\"ax\"\n" | |
58 | " .balign 4\n" | |
59 | "3: ldi %0, #%3\n" | |
60 | " seth r14, #high(2b)\n" | |
61 | " or3 r14, r14, #low(2b)\n" | |
62 | " jmp r14\n" | |
63 | ".previous\n" | |
64 | ".section __ex_table,\"a\"\n" | |
65 | " .balign 4\n" | |
66 | " .long 1b,3b\n" | |
67 | ".previous\n" | |
68 | : "=&r" (oldval) | |
69 | : "r" (addr), "r" (1), "i"(-EFAULT) | |
70 | : "r14", "memory" | |
71 | #ifdef CONFIG_CHIP_M32700_TS1 | |
72 | , "r4" | |
73 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
74 | ); | |
1da177e4 LT |
75 | |
76 | return oldval; | |
77 | } | |
1da177e4 | 78 | |
1da177e4 LT |
79 | asmlinkage int sys_cacheflush(void *addr, int bytes, int cache) |
80 | { | |
5aa8b6c1 | 81 | /* This should flush more selectively ... */ |
1da177e4 LT |
82 | _flush_cache_all(); |
83 | return 0; | |
84 | } | |
85 | ||
86 | asmlinkage int sys_cachectl(char *addr, int nbytes, int op) | |
87 | { | |
88 | /* Not implemented yet. */ | |
89 | return -ENOSYS; | |
90 | } |