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>
88 lines
2 KiB
C
88 lines
2 KiB
C
/*
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* contains various random system calls that have a non-standard
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* calling sequence on the Linux/Blackfin platform.
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*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later
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*/
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#include <linux/spinlock.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/ipc.h>
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#include <linux/unistd.h>
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#include <asm/cacheflush.h>
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#include <asm/dma.h>
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#include <asm/cachectl.h>
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#include <asm/ptrace.h>
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asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
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{
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return sram_alloc_with_lsl(size, flags);
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}
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asmlinkage int sys_sram_free(const void *addr)
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{
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return sram_free_with_lsl(addr);
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}
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asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
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{
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return safe_dma_memcpy(dest, src, len);
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}
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#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
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#include <linux/fb.h>
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unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct fb_info *info = filp->private_data;
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return (unsigned long)info->screen_base;
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}
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EXPORT_SYMBOL(get_fb_unmapped_area);
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#endif
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/* Needed for legacy userspace atomic emulation */
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static DEFINE_SPINLOCK(bfin_spinlock_lock);
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#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
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__attribute__((l1_text))
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#endif
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asmlinkage int sys_bfin_spinlock(int *p)
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{
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int ret, tmp = 0;
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spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
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ret = get_user(tmp, p);
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if (likely(ret == 0)) {
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if (unlikely(tmp))
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ret = 1;
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else
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put_user(1, p);
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}
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spin_unlock(&bfin_spinlock_lock);
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return ret;
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}
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SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
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{
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if (is_user_addr_valid(current, addr, len) != 0)
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return -EINVAL;
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if (op & DCACHE)
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blackfin_dcache_flush_range(addr, addr + len);
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if (op & ICACHE)
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blackfin_icache_flush_range(addr, addr + len);
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return 0;
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}
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