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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/blackfin/kernel/sys_bfin.c
Initial import
Diffstat (limited to 'arch/blackfin/kernel/sys_bfin.c')
-rw-r--r--arch/blackfin/kernel/sys_bfin.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/sys_bfin.c b/arch/blackfin/kernel/sys_bfin.c
new file mode 100644
index 000000000..d998383cb
--- /dev/null
+++ b/arch/blackfin/kernel/sys_bfin.c
@@ -0,0 +1,88 @@
+/*
+ * 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>
+#include <linux/export.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;
+}