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| author |  Vincent Chen <vincentc@andestech.com>
| 2018-11-22 11:14:34 +0800 |
|---|---|---|
| committer |  Greentime Hu <greentime@andestech.com>
| 2018-11-22 18:13:13 +0800 |
| commit | e46bf83c1864a20f9dd17d597ec9be18ed05add8 (patch) | |
| tree | b790f6d6935256140cb8e02d9a5dffd64ad74d14 /arch/nds32/kernel/setup.c | |
| parent | nds32: Remove duplicated include from pm.c (diff) | |
| download | linux-e46bf83c1864a20f9dd17d597ec9be18ed05add8.tar.gz linux-e46bf83c1864a20f9dd17d597ec9be18ed05add8.tar.bz2 linux-e46bf83c1864a20f9dd17d597ec9be18ed05add8.zip | |
nds32: nds32 FPU port
This patch set contains basic components for supporting the nds32 FPU,
such as exception handlers and context switch for FPU registers. By
default, the lazy FPU scheme is supported and the user can configure it via
CONFIG_LZAY_FPU.
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/nds32/kernel/setup.c')
| -rw-r--r-- | arch/nds32/kernel/setup.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/nds32/kernel/setup.c b/arch/nds32/kernel/setup.c index eacc79024879..d7f5657bc638 100644 --- a/arch/nds32/kernel/setup.c +++ b/arch/nds32/kernel/setup.c @@ -15,6 +15,7 @@ #include <asm/proc-fns.h> #include <asm/cache_info.h> #include <asm/elf.h> +#include <asm/fpu.h> #include <nds32_intrinsic.h> #define HWCAP_MFUSR_PC 0x000001 @@ -40,6 +41,7 @@ #define HWCAP_DX_REGS 0x100000 unsigned long cpu_id, cpu_rev, cpu_cfgid; +bool has_fpu = false; char cpu_series; char *endianness = NULL; @@ -136,6 +138,11 @@ static void __init dump_cpu_info(int cpu) (aliasing_num - 1) << PAGE_SHIFT; } #endif +#ifdef CONFIG_FPU + /* Disable fpu and enable when it is used. */ + if (has_fpu) + disable_fpu(); +#endif } static void __init setup_cpuinfo(void) @@ -180,9 +187,10 @@ static void __init setup_cpuinfo(void) if (cpu_cfgid & 0x0004) elf_hwcap |= HWCAP_EXT2; - if (cpu_cfgid & 0x0008) + if (cpu_cfgid & 0x0008) { elf_hwcap |= HWCAP_FPU; - + has_fpu = true; + } if (cpu_cfgid & 0x0010) elf_hwcap |= HWCAP_STRING; |