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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/ex-entry.S | |
| parent | 4f014a41b4efd72cbefb5525372dfcd65162eb4e (diff) | |
| download | linux-e46bf83c1864a20f9dd17d597ec9be18ed05add8.tar.bz2 | |
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/ex-entry.S')
| -rw-r--r-- | arch/nds32/kernel/ex-entry.S | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/nds32/kernel/ex-entry.S b/arch/nds32/kernel/ex-entry.S index 21a144071566..107d98a1d1b8 100644 --- a/arch/nds32/kernel/ex-entry.S +++ b/arch/nds32/kernel/ex-entry.S @@ -7,6 +7,7 @@ #include <asm/errno.h> #include <asm/asm-offsets.h> #include <asm/page.h> +#include <asm/fpu.h> #ifdef CONFIG_HWZOL .macro push_zol @@ -15,12 +16,31 @@ mfusr $r16, $LC .endm #endif + .macro skip_save_fucop_ctl +#if defined(CONFIG_FPU) +skip_fucop_ctl: + smw.adm $p0, [$sp], $p0, #0x1 + j fucop_ctl_done +#endif + .endm .macro save_user_regs - +#if defined(CONFIG_FPU) + sethi $p0, hi20(has_fpu) + lbsi $p0, [$p0+lo12(has_fpu)] + beqz $p0, skip_fucop_ctl + mfsr $p0, $FUCOP_CTL + smw.adm $p0, [$sp], $p0, #0x1 + bclr $p0, $p0, #FUCOP_CTL_offCP0EN + mtsr $p0, $FUCOP_CTL +fucop_ctl_done: + /* move $SP to the bottom of pt_regs */ + addi $sp, $sp, -FUCOP_CTL_OFFSET +#else smw.adm $sp, [$sp], $sp, #0x1 /* move $SP to the bottom of pt_regs */ addi $sp, $sp, -OSP_OFFSET +#endif /* push $r0 ~ $r25 */ smw.bim $r0, [$sp], $r25 @@ -79,6 +99,7 @@ exception_handlers: .long eh_syscall !Syscall .long asm_do_IRQ !IRQ + skip_save_fucop_ctl common_exception_handler: save_user_regs mfsr $p0, $ITYPE @@ -103,7 +124,6 @@ common_exception_handler: mtsr $r21, $PSW dsb jr $p1 - /* syscall */ 1: addi $p1, $p0, #-NDS32_VECTOR_offEXCEPTION |