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Diffstat (limited to 'arch/arm/mach-iop32x/cp6.c')
-rw-r--r--arch/arm/mach-iop32x/cp6.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mach-iop32x/cp6.c b/arch/arm/mach-iop32x/cp6.c
new file mode 100644
index 000000000000..ec74b07fb7e3
--- /dev/null
+++ b/arch/arm/mach-iop32x/cp6.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * IOP Coprocessor-6 access handler
+ * Copyright (c) 2006, Intel Corporation.
+ */
+#include <linux/init.h>
+#include <asm/traps.h>
+#include <asm/ptrace.h>
+
+static int cp6_trap(struct pt_regs *regs, unsigned int instr)
+{
+ u32 temp;
+
+ /* enable cp6 access */
+ asm volatile (
+ "mrc p15, 0, %0, c15, c1, 0\n\t"
+ "orr %0, %0, #(1 << 6)\n\t"
+ "mcr p15, 0, %0, c15, c1, 0\n\t"
+ : "=r"(temp));
+
+ return 0;
+}
+
+/* permit kernel space cp6 access
+ * deny user space cp6 access
+ */
+static struct undef_hook cp6_hook = {
+ .instr_mask = 0x0f000ff0,
+ .instr_val = 0x0e000610,
+ .cpsr_mask = MODE_MASK,
+ .cpsr_val = SVC_MODE,
+ .fn = cp6_trap,
+};
+
+void __init iop_init_cp6_handler(void)
+{
+ register_undef_hook(&cp6_hook);
+}