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