mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 12:14:01 +08:00
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/*
|
|
* linux/arch/m32r/kernel/sys_m32r.c
|
|
*
|
|
* This file contains various random system calls that
|
|
* have a non-standard calling sequence on the Linux/M32R platform.
|
|
*
|
|
* Taken from i386 version.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/sem.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/shm.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/file.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/ipc.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/cachectl.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/syscall.h>
|
|
#include <asm/unistd.h>
|
|
|
|
/*
|
|
* sys_tas() - test-and-set
|
|
*/
|
|
asmlinkage int sys_tas(int __user *addr)
|
|
{
|
|
int oldval;
|
|
|
|
if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
|
|
return -EFAULT;
|
|
|
|
/* atomic operation:
|
|
* oldval = *addr; *addr = 1;
|
|
*/
|
|
__asm__ __volatile__ (
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
" .fillinsn\n"
|
|
"1:\n"
|
|
" lock %0, @%1 -> unlock %2, @%1\n"
|
|
"2:\n"
|
|
/* NOTE:
|
|
* The m32r processor can accept interrupts only
|
|
* at the 32-bit instruction boundary.
|
|
* So, in the above code, the "unlock" instruction
|
|
* can be executed continuously after the "lock"
|
|
* instruction execution without any interruptions.
|
|
*/
|
|
".section .fixup,\"ax\"\n"
|
|
" .balign 4\n"
|
|
"3: ldi %0, #%3\n"
|
|
" seth r14, #high(2b)\n"
|
|
" or3 r14, r14, #low(2b)\n"
|
|
" jmp r14\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .balign 4\n"
|
|
" .long 1b,3b\n"
|
|
".previous\n"
|
|
: "=&r" (oldval)
|
|
: "r" (addr), "r" (1), "i"(-EFAULT)
|
|
: "r14", "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
|
|
return oldval;
|
|
}
|
|
|
|
asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
|
|
{
|
|
/* This should flush more selectively ... */
|
|
_flush_cache_all();
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
|
|
{
|
|
/* Not implemented yet. */
|
|
return -ENOSYS;
|
|
}
|