| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/vfpmacros.h> |
| |
| .text |
| .pushsection .hyp.text, "ax" |
| |
| /* void __vfp_save_state(struct vfp_hard_struct *vfp); */ |
| ENTRY(__vfp_save_state) |
| push {r4, r5} |
| VFPFMRX r1, FPEXC |
| |
| @ Make sure *really* VFP is enabled so we can touch the registers. |
| orr r5, r1, #FPEXC_EN |
| tst r5, #FPEXC_EX @ Check for VFP Subarchitecture |
| bic r5, r5, #FPEXC_EX @ FPEXC_EX disable |
| VFPFMXR FPEXC, r5 |
| isb |
| |
| VFPFMRX r2, FPSCR |
| beq 1f |
| |
| @ If FPEXC_EX is 0, then FPINST/FPINST2 reads are upredictable, so |
| @ we only need to save them if FPEXC_EX is set. |
| VFPFMRX r3, FPINST |
| tst r5, #FPEXC_FP2V |
| VFPFMRX r4, FPINST2, ne @ vmrsne |
| 1: |
| VFPFSTMIA r0, r5 @ Save VFP registers |
| stm r0, {r1-r4} @ Save FPEXC, FPSCR, FPINST, FPINST2 |
| pop {r4, r5} |
| bx lr |
| ENDPROC(__vfp_save_state) |
| |
| /* void __vfp_restore_state(struct vfp_hard_struct *vfp); |
| * Assume FPEXC_EN is on and FPEXC_EX is off */ |
| ENTRY(__vfp_restore_state) |
| VFPFLDMIA r0, r1 @ Load VFP registers |
| ldm r0, {r0-r3} @ Load FPEXC, FPSCR, FPINST, FPINST2 |
| |
| VFPFMXR FPSCR, r1 |
| tst r0, #FPEXC_EX @ Check for VFP Subarchitecture |
| beq 1f |
| VFPFMXR FPINST, r2 |
| tst r0, #FPEXC_FP2V |
| VFPFMXR FPINST2, r3, ne |
| 1: |
| VFPFMXR FPEXC, r0 @ FPEXC (last, in case !EN) |
| bx lr |
| ENDPROC(__vfp_restore_state) |
| |
| .popsection |
