thead.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
 3#define _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
 4
 5#include <asm/vendor_extensions.h>
 6
 7#include <linux/types.h>
 8
 9/*
10 * Extension keys must be strictly less than RISCV_ISA_VENDOR_EXT_MAX.
11 */
12#define RISCV_ISA_VENDOR_EXT_XTHEADVECTOR		0
13
14extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead;
15
16#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD
17void disable_xtheadvector(void);
18#else
19static inline void disable_xtheadvector(void) { }
20#endif
21
22/* Extension specific helpers */
23
24/*
25 * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older
26 * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for
27 * vsetvli	t4, x0, e8, m8, d1
28 */
29#define THEAD_VSETVLI_T4X0E8M8D1	".long	0x00307ed7\n\t"
30
31/*
32 * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same
33 * encoding as the standard vse8.v and vle8.v, compilers seem to optimize
34 * the call resulting in a different encoding and then using a value for
35 * the "mop" field that is not part of vector-0.7.1
36 * So encode specific variants for vstate_save and _restore.
37 */
38#define THEAD_VSB_V_V0T0		".long	0x02028027\n\t"
39#define THEAD_VSB_V_V8T0		".long	0x02028427\n\t"
40#define THEAD_VSB_V_V16T0		".long	0x02028827\n\t"
41#define THEAD_VSB_V_V24T0		".long	0x02028c27\n\t"
42#define THEAD_VLB_V_V0T0		".long	0x012028007\n\t"
43#define THEAD_VLB_V_V8T0		".long	0x012028407\n\t"
44#define THEAD_VLB_V_V16T0		".long	0x012028807\n\t"
45#define THEAD_VLB_V_V24T0		".long	0x012028c07\n\t"
46
47#endif