summaryrefslogtreecommitdiffstats
path: root/kernel/arch/arm64/include/asm/fpsimd.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/arm64/include/asm/fpsimd.h')
-rw-r--r--kernel/arch/arm64/include/asm/fpsimd.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/kernel/arch/arm64/include/asm/fpsimd.h b/kernel/arch/arm64/include/asm/fpsimd.h
new file mode 100644
index 000000000..50f559f57
--- /dev/null
+++ b/kernel/arch/arm64/include/asm/fpsimd.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_FP_H
+#define __ASM_FP_H
+
+#include <asm/ptrace.h>
+
+#ifndef __ASSEMBLY__
+
+/*
+ * FP/SIMD storage area has:
+ * - FPSR and FPCR
+ * - 32 128-bit data registers
+ *
+ * Note that user_fpsimd forms a prefix of this structure, which is
+ * relied upon in the ptrace FP/SIMD accessors.
+ */
+struct fpsimd_state {
+ union {
+ struct user_fpsimd_state user_fpsimd;
+ struct {
+ __uint128_t vregs[32];
+ u32 fpsr;
+ u32 fpcr;
+ };
+ };
+ /* the id of the last cpu to have restored this state */
+ unsigned int cpu;
+};
+
+/*
+ * Struct for stacking the bottom 'n' FP/SIMD registers.
+ */
+struct fpsimd_partial_state {
+ u32 fpsr;
+ u32 fpcr;
+ u32 num_regs;
+ __uint128_t vregs[32];
+};
+
+
+#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
+/* Masks for extracting the FPSR and FPCR from the FPSCR */
+#define VFP_FPSCR_STAT_MASK 0xf800009f
+#define VFP_FPSCR_CTRL_MASK 0x07f79f00
+/*
+ * The VFP state has 32x64-bit registers and a single 32-bit
+ * control/status register.
+ */
+#define VFP_STATE_SIZE ((32 * 8) + 4)
+#endif
+
+struct task_struct;
+
+extern void fpsimd_save_state(struct fpsimd_state *state);
+extern void fpsimd_load_state(struct fpsimd_state *state);
+
+extern void fpsimd_thread_switch(struct task_struct *next);
+extern void fpsimd_flush_thread(void);
+
+extern void fpsimd_preserve_current_state(void);
+extern void fpsimd_restore_current_state(void);
+extern void fpsimd_update_current_state(struct fpsimd_state *state);
+
+extern void fpsimd_flush_task_state(struct task_struct *target);
+
+extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state,
+ u32 num_regs);
+extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state);
+
+#endif
+
+#endif