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Allow to disable FPU support

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FPU codes have been separated from common part in previous patches.
This patch add the CONFIG_FPU option and some stubs, so that a no-FPU
configuration is allowed.

Signed-off-by: Alan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Nick Hu <nickhu@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alan Kao
2018-10-09 10:18:33 +08:00
committed by Palmer Dabbelt
parent e8be530233
commit 9671f70614
6 changed files with 29 additions and 3 deletions
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10
arch/riscv/include/asm/switch_to.h
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@@ -18,6 +18,7 @@
#include <asm/ptrace.h>
#include <asm/csr.h>
#ifdef CONFIG_FPU
extern void __fstate_save(struct task_struct *save_to);
extern void __fstate_restore(struct task_struct *restore_from);
@@ -55,6 +56,15 @@ static inline void __switch_to_aux(struct task_struct *prev,
fstate_restore(next, task_pt_regs(next));
}
#define DEFAULT_SSTATUS (SR_SPIE | SR_FS_INITIAL)
#else
#define fstate_save(task, regs) do { } while (0)
#define fstate_restore(task, regs) do { } while (0)
#define __switch_to_aux(__prev, __next) do { } while (0)
#define DEFAULT_SSTATUS (SR_SPIE | SR_FS_OFF)
#endif
extern struct task_struct *__switch_to(struct task_struct *,
struct task_struct *);