diff options
Diffstat (limited to 'arch/riscv/include/asm/switch_to.h')
| -rw-r--r-- | arch/riscv/include/asm/switch_to.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/switch_to.h b/arch/riscv/include/asm/switch_to.h index 7594df37cc9f..94e33216b2d9 100644 --- a/arch/riscv/include/asm/switch_to.h +++ b/arch/riscv/include/asm/switch_to.h @@ -70,6 +70,24 @@ static __always_inline bool has_fpu(void) { return false; } #define __switch_to_fpu(__prev, __next) do { } while (0) #endif +static inline void envcfg_update_bits(struct task_struct *task, + unsigned long mask, unsigned long val) +{ + unsigned long envcfg; + + envcfg = (task->thread.envcfg & ~mask) | val; + task->thread.envcfg = envcfg; + if (task == current) + csr_write(CSR_ENVCFG, envcfg); +} + +static inline void __switch_to_envcfg(struct task_struct *next) +{ + asm volatile (ALTERNATIVE("nop", "csrw " __stringify(CSR_ENVCFG) ", %0", + 0, RISCV_ISA_EXT_XLINUXENVCFG, 1) + :: "r" (next->thread.envcfg) : "memory"); +} + extern struct task_struct *__switch_to(struct task_struct *, struct task_struct *); @@ -103,6 +121,7 @@ do { \ __switch_to_vector(__prev, __next); \ if (switch_to_should_flush_icache(__next)) \ local_flush_icache_all(); \ + __switch_to_envcfg(__next); \ ((last) = __switch_to(__prev, __next)); \ } while (0) |