99a5b2878b
Flushing caches sometimes requires anomaly workarounds which require supervisor-only insns. Normally we don't need to flush caches from userspace so this isn't a problem, but when gcc generates trampolines on the stack, we do. So add a new syscall for gcc to use modeled after the mips version. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
87 lines
2 KiB
C
87 lines
2 KiB
C
/*
|
|
* contains various random system calls that have a non-standard
|
|
* calling sequence on the Linux/Blackfin platform.
|
|
*
|
|
* Copyright 2004-2009 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/sem.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/shm.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/ipc.h>
|
|
#include <linux/unistd.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/cachectl.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
|
|
{
|
|
return sram_alloc_with_lsl(size, flags);
|
|
}
|
|
|
|
asmlinkage int sys_sram_free(const void *addr)
|
|
{
|
|
return sram_free_with_lsl(addr);
|
|
}
|
|
|
|
asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
|
|
{
|
|
return safe_dma_memcpy(dest, src, len);
|
|
}
|
|
|
|
#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
|
|
#include <linux/fb.h>
|
|
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct fb_info *info = filp->private_data;
|
|
return (unsigned long)info->screen_base;
|
|
}
|
|
EXPORT_SYMBOL(get_fb_unmapped_area);
|
|
#endif
|
|
|
|
/* Needed for legacy userspace atomic emulation */
|
|
static DEFINE_SPINLOCK(bfin_spinlock_lock);
|
|
|
|
#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
|
|
__attribute__((l1_text))
|
|
#endif
|
|
asmlinkage int sys_bfin_spinlock(int *p)
|
|
{
|
|
int ret, tmp = 0;
|
|
|
|
spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
|
|
ret = get_user(tmp, p);
|
|
if (likely(ret == 0)) {
|
|
if (unlikely(tmp))
|
|
ret = 1;
|
|
else
|
|
put_user(1, p);
|
|
}
|
|
spin_unlock(&bfin_spinlock_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
|
|
{
|
|
if (is_user_addr_valid(current, addr, len) != 0)
|
|
return -EINVAL;
|
|
|
|
if (op & DCACHE)
|
|
blackfin_dcache_flush_range(addr, addr + len);
|
|
if (op & ICACHE)
|
|
blackfin_icache_flush_range(addr, addr + len);
|
|
|
|
return 0;
|
|
}
|