| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| 3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/linkage.h> |
| 19 | #include <asm/vfpmacros.h> |
| 20 | |
| 21 | .text |
| 22 | .pushsection .hyp.text, "ax" |
| 23 | |
| 24 | /* void __vfp_save_state(struct vfp_hard_struct *vfp); */ |
| 25 | ENTRY(__vfp_save_state) |
| 26 | push {r4, r5} |
| 27 | VFPFMRX r1, FPEXC |
| 28 | |
| 29 | @ Make sure *really* VFP is enabled so we can touch the registers. |
| 30 | orr r5, r1, #FPEXC_EN |
| 31 | tst r5, #FPEXC_EX @ Check for VFP Subarchitecture |
| 32 | bic r5, r5, #FPEXC_EX @ FPEXC_EX disable |
| 33 | VFPFMXR FPEXC, r5 |
| 34 | isb |
| 35 | |
| 36 | VFPFMRX r2, FPSCR |
| 37 | beq 1f |
| 38 | |
| 39 | @ If FPEXC_EX is 0, then FPINST/FPINST2 reads are upredictable, so |
| 40 | @ we only need to save them if FPEXC_EX is set. |
| 41 | VFPFMRX r3, FPINST |
| 42 | tst r5, #FPEXC_FP2V |
| 43 | VFPFMRX r4, FPINST2, ne @ vmrsne |
| 44 | 1: |
| 45 | VFPFSTMIA r0, r5 @ Save VFP registers |
| 46 | stm r0, {r1-r4} @ Save FPEXC, FPSCR, FPINST, FPINST2 |
| 47 | pop {r4, r5} |
| 48 | bx lr |
| 49 | ENDPROC(__vfp_save_state) |
| 50 | |
| 51 | /* void __vfp_restore_state(struct vfp_hard_struct *vfp); |
| 52 | * Assume FPEXC_EN is on and FPEXC_EX is off */ |
| 53 | ENTRY(__vfp_restore_state) |
| 54 | VFPFLDMIA r0, r1 @ Load VFP registers |
| 55 | ldm r0, {r0-r3} @ Load FPEXC, FPSCR, FPINST, FPINST2 |
| 56 | |
| 57 | VFPFMXR FPSCR, r1 |
| 58 | tst r0, #FPEXC_EX @ Check for VFP Subarchitecture |
| 59 | beq 1f |
| 60 | VFPFMXR FPINST, r2 |
| 61 | tst r0, #FPEXC_FP2V |
| 62 | VFPFMXR FPINST2, r3, ne |
| 63 | 1: |
| 64 | VFPFMXR FPEXC, r0 @ FPEXC (last, in case !EN) |
| 65 | bx lr |
| 66 | ENDPROC(__vfp_restore_state) |
| 67 | |
| 68 | .popsection |