1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __ASM_FP_H
17#define __ASM_FP_H
18
19#include <asm/ptrace.h>
20
21#ifndef __ASSEMBLY__
22
23/*
24 * FP/SIMD storage area has:
25 *  - FPSR and FPCR
26 *  - 32 128-bit data registers
27 *
28 * Note that user_fpsimd forms a prefix of this structure, which is
29 * relied upon in the ptrace FP/SIMD accessors.
30 */
31struct fpsimd_state {
32	union {
33		struct user_fpsimd_state user_fpsimd;
34		struct {
35			__uint128_t vregs[32];
36			u32 fpsr;
37			u32 fpcr;
38		};
39	};
40	/* the id of the last cpu to have restored this state */
41	unsigned int cpu;
42};
43
44/*
45 * Struct for stacking the bottom 'n' FP/SIMD registers.
46 */
47struct fpsimd_partial_state {
48	u32		fpsr;
49	u32		fpcr;
50	u32		num_regs;
51	__uint128_t	vregs[32];
52};
53
54
55#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
56/* Masks for extracting the FPSR and FPCR from the FPSCR */
57#define VFP_FPSCR_STAT_MASK	0xf800009f
58#define VFP_FPSCR_CTRL_MASK	0x07f79f00
59/*
60 * The VFP state has 32x64-bit registers and a single 32-bit
61 * control/status register.
62 */
63#define VFP_STATE_SIZE		((32 * 8) + 4)
64#endif
65
66struct task_struct;
67
68extern void fpsimd_save_state(struct fpsimd_state *state);
69extern void fpsimd_load_state(struct fpsimd_state *state);
70
71extern void fpsimd_thread_switch(struct task_struct *next);
72extern void fpsimd_flush_thread(void);
73
74extern void fpsimd_preserve_current_state(void);
75extern void fpsimd_restore_current_state(void);
76extern void fpsimd_update_current_state(struct fpsimd_state *state);
77
78extern void fpsimd_flush_task_state(struct task_struct *target);
79
80extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state,
81				      u32 num_regs);
82extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state);
83
84#endif
85
86#endif
87