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 */ 31 struct 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 */ 47 struct 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 66 struct task_struct; 67 68 extern void fpsimd_save_state(struct fpsimd_state *state); 69 extern void fpsimd_load_state(struct fpsimd_state *state); 70 71 extern void fpsimd_thread_switch(struct task_struct *next); 72 extern void fpsimd_flush_thread(void); 73 74 extern void fpsimd_preserve_current_state(void); 75 extern void fpsimd_restore_current_state(void); 76 extern void fpsimd_update_current_state(struct fpsimd_state *state); 77 78 extern void fpsimd_flush_task_state(struct task_struct *target); 79 80 extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state, 81 u32 num_regs); 82 extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state); 83 84 #endif 85 86 #endif 87