tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * arch/arm/include/asm/vfpmacros.h
4 *
5 * Assembler-only file containing VFP macros and register definitions.
6 */
7#include <asm/hwcap.h>
8
9#include <asm/vfp.h>
10
11 .macro VFPFMRX, rd, sysreg, cond
12 vmrs\cond \rd, \sysreg
13 .endm
14
15 .macro VFPFMXR, sysreg, rd, cond
16 vmsr\cond \sysreg, \rd
17 .endm
18
19 @ read all the working registers back into the VFP
20 .macro VFPFLDMIA, base, tmp
21 .fpu vfpv2
22#if __LINUX_ARM_ARCH__ < 6
23 fldmiax \base!, {d0-d15}
24#else
25 vldmia \base!, {d0-d15}
26#endif
27#ifdef CONFIG_VFPv3
28 .fpu vfpv3
29#if __LINUX_ARM_ARCH__ <= 6
30 ldr \tmp, =elf_hwcap @ may not have MVFR regs
31 ldr \tmp, [\tmp, #0]
32 tst \tmp, #HWCAP_VFPD32
33 vldmiane \base!, {d16-d31}
34 addeq \base, \base, #32*4 @ step over unused register space
35#else
36 VFPFMRX \tmp, MVFR0 @ Media and VFP Feature Register 0
37 and \tmp, \tmp, #MVFR0_A_SIMD_MASK @ A_SIMD field
38 cmp \tmp, #2 @ 32 x 64bit registers?
39 vldmiaeq \base!, {d16-d31}
40 addne \base, \base, #32*4 @ step over unused register space
41#endif
42#endif
43 .endm
44
45 @ write all the working registers out of the VFP
46 .macro VFPFSTMIA, base, tmp
47#if __LINUX_ARM_ARCH__ < 6
48 fstmiax \base!, {d0-d15}
49#else
50 vstmia \base!, {d0-d15}
51#endif
52#ifdef CONFIG_VFPv3
53 .fpu vfpv3
54#if __LINUX_ARM_ARCH__ <= 6
55 ldr \tmp, =elf_hwcap @ may not have MVFR regs
56 ldr \tmp, [\tmp, #0]
57 tst \tmp, #HWCAP_VFPD32
58 vstmiane \base!, {d16-d31}
59 addeq \base, \base, #32*4 @ step over unused register space
60#else
61 VFPFMRX \tmp, MVFR0 @ Media and VFP Feature Register 0
62 and \tmp, \tmp, #MVFR0_A_SIMD_MASK @ A_SIMD field
63 cmp \tmp, #2 @ 32 x 64bit registers?
64 vstmiaeq \base!, {d16-d31}
65 addne \base, \base, #32*4 @ step over unused register space
66#endif
67#endif
68 .endm