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01e3313e34
xtheadvector uses different encodings than standard vector for vsetvli and vector loads/stores. Write the instruction formats to be used in assembly code. Co-developed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Tested-by: Yangyu Chen <cyy@cyyself.name> Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-8-236c22791ef9@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
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#define _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H
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#include <asm/vendor_extensions.h>
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#include <linux/types.h>
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/*
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* Extension keys must be strictly less than RISCV_ISA_VENDOR_EXT_MAX.
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*/
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#define RISCV_ISA_VENDOR_EXT_XTHEADVECTOR 0
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extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead;
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#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD
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void disable_xtheadvector(void);
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#else
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static inline void disable_xtheadvector(void) { }
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#endif
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/* Extension specific helpers */
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/*
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* Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older
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* encoding for vsetvli (ta, ma vs. d1), so provide an instruction for
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* vsetvli t4, x0, e8, m8, d1
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*/
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#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t"
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/*
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* While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same
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* encoding as the standard vse8.v and vle8.v, compilers seem to optimize
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* the call resulting in a different encoding and then using a value for
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* the "mop" field that is not part of vector-0.7.1
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* So encode specific variants for vstate_save and _restore.
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*/
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#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t"
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#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t"
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#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t"
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#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t"
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#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t"
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#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t"
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#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t"
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#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t"
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#endif
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