1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2020 SiFive
6 #ifndef __ASM_RISCV_VECTOR_H
7 #define __ASM_RISCV_VECTOR_H
9 #include <linux/types.h>
10 #include <uapi/asm-generic/errno.h>
12 #ifdef CONFIG_RISCV_ISA_V
14 #include <linux/stringify.h>
15 #include <linux/sched.h>
16 #include <linux/sched/task_stack.h>
17 #include <asm/ptrace.h>
18 #include <asm/hwcap.h>
22 extern unsigned long riscv_v_vsize;
23 int riscv_v_setup_vsize(void);
24 bool riscv_v_first_use_handler(struct pt_regs *regs);
26 static __always_inline bool has_vector(void)
28 return riscv_has_extension_unlikely(RISCV_ISA_EXT_v);
31 static inline void __riscv_v_vstate_clean(struct pt_regs *regs)
33 regs->status = (regs->status & ~SR_VS) | SR_VS_CLEAN;
36 static inline void riscv_v_vstate_off(struct pt_regs *regs)
38 regs->status = (regs->status & ~SR_VS) | SR_VS_OFF;
41 static inline void riscv_v_vstate_on(struct pt_regs *regs)
43 regs->status = (regs->status & ~SR_VS) | SR_VS_INITIAL;
46 static inline bool riscv_v_vstate_query(struct pt_regs *regs)
48 return (regs->status & SR_VS) != 0;
51 static __always_inline void riscv_v_enable(void)
53 csr_set(CSR_SSTATUS, SR_VS);
56 static __always_inline void riscv_v_disable(void)
58 csr_clear(CSR_SSTATUS, SR_VS);
61 static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest)
64 "csrr %0, " __stringify(CSR_VSTART) "\n\t"
65 "csrr %1, " __stringify(CSR_VTYPE) "\n\t"
66 "csrr %2, " __stringify(CSR_VL) "\n\t"
67 "csrr %3, " __stringify(CSR_VCSR) "\n\t"
68 : "=r" (dest->vstart), "=r" (dest->vtype), "=r" (dest->vl),
69 "=r" (dest->vcsr) : :);
72 static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src)
76 ".option arch, +v\n\t"
77 "vsetvl x0, %2, %1\n\t"
79 "csrw " __stringify(CSR_VSTART) ", %0\n\t"
80 "csrw " __stringify(CSR_VCSR) ", %3\n\t"
81 : : "r" (src->vstart), "r" (src->vtype), "r" (src->vl),
85 static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
91 __vstate_csr_save(save_to);
94 ".option arch, +v\n\t"
95 "vsetvli %0, x0, e8, m8, ta, ma\n\t"
100 "vse8.v v16, (%1)\n\t"
102 "vse8.v v24, (%1)\n\t"
104 : "=&r" (vl) : "r" (datap) : "memory");
108 static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_from,
116 ".option arch, +v\n\t"
117 "vsetvli %0, x0, e8, m8, ta, ma\n\t"
118 "vle8.v v0, (%1)\n\t"
120 "vle8.v v8, (%1)\n\t"
122 "vle8.v v16, (%1)\n\t"
124 "vle8.v v24, (%1)\n\t"
126 : "=&r" (vl) : "r" (datap) : "memory");
127 __vstate_csr_restore(restore_from);
131 static inline void riscv_v_vstate_save(struct task_struct *task,
132 struct pt_regs *regs)
134 if ((regs->status & SR_VS) == SR_VS_DIRTY) {
135 struct __riscv_v_ext_state *vstate = &task->thread.vstate;
137 __riscv_v_vstate_save(vstate, vstate->datap);
138 __riscv_v_vstate_clean(regs);
142 static inline void riscv_v_vstate_restore(struct task_struct *task,
143 struct pt_regs *regs)
145 if ((regs->status & SR_VS) != SR_VS_OFF) {
146 struct __riscv_v_ext_state *vstate = &task->thread.vstate;
148 __riscv_v_vstate_restore(vstate, vstate->datap);
149 __riscv_v_vstate_clean(regs);
153 static inline void __switch_to_vector(struct task_struct *prev,
154 struct task_struct *next)
156 struct pt_regs *regs;
158 regs = task_pt_regs(prev);
159 riscv_v_vstate_save(prev, regs);
160 riscv_v_vstate_restore(next, task_pt_regs(next));
163 #else /* ! CONFIG_RISCV_ISA_V */
167 static inline int riscv_v_setup_vsize(void) { return -EOPNOTSUPP; }
168 static __always_inline bool has_vector(void) { return false; }
169 static inline bool riscv_v_first_use_handler(struct pt_regs *regs) { return false; }
170 static inline bool riscv_v_vstate_query(struct pt_regs *regs) { return false; }
171 #define riscv_v_vsize (0)
172 #define riscv_v_vstate_save(task, regs) do {} while (0)
173 #define riscv_v_vstate_restore(task, regs) do {} while (0)
174 #define __switch_to_vector(__prev, __next) do {} while (0)
175 #define riscv_v_vstate_off(regs) do {} while (0)
176 #define riscv_v_vstate_on(regs) do {} while (0)
178 #endif /* CONFIG_RISCV_ISA_V */
180 #endif /* ! __ASM_RISCV_VECTOR_H */