mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 06:12:08 +00:00
190f1ca85d
This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
|
|
* 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
|