1 /* 2 * Copyright (c) 2017-2023, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <stdbool.h> 8 9 #include <arch.h> 10 #include <arch_helpers.h> 11 #include <lib/cassert.h> 12 #include <lib/el3_runtime/pubsub.h> 13 #include <lib/extensions/sve.h> 14 15 CASSERT(SVE_VECTOR_LEN <= 2048, assert_sve_vl_too_long); 16 CASSERT(SVE_VECTOR_LEN >= 128, assert_sve_vl_too_short); 17 CASSERT((SVE_VECTOR_LEN % 128) == 0, assert_sve_vl_granule); 18 19 /* 20 * Converts SVE vector size restriction in bytes to LEN according to ZCR_EL3 documentation. 21 * VECTOR_SIZE = (LEN+1) * 128 22 */ 23 #define CONVERT_SVE_LENGTH(x) (((x / 128) - 1)) 24 sve_enable_per_world(per_world_context_t * per_world_ctx)25void sve_enable_per_world(per_world_context_t *per_world_ctx) 26 { 27 u_register_t cptr_el3; 28 29 /* Enable access to SVE functionality for all ELs. */ 30 cptr_el3 = per_world_ctx->ctx_cptr_el3; 31 cptr_el3 = (cptr_el3 | CPTR_EZ_BIT) & ~(TFP_BIT); 32 per_world_ctx->ctx_cptr_el3 = cptr_el3; 33 34 /* Restrict maximum SVE vector length (SVE_VECTOR_LEN+1) * 128. */ 35 per_world_ctx->ctx_zcr_el3 = (ZCR_EL3_LEN_MASK & CONVERT_SVE_LENGTH(SVE_VECTOR_LEN)); 36 } 37 sve_init_el2_unused(void)38void sve_init_el2_unused(void) 39 { 40 /* 41 * CPTR_EL2.TFP: Set to zero so that Non-secure accesses to Advanced 42 * SIMD and floating-point functionality from both Execution states do 43 * not trap to EL2. 44 */ 45 write_cptr_el2(read_cptr_el2() & ~CPTR_EL2_TFP_BIT); 46 } 47 sve_disable_per_world(per_world_context_t * per_world_ctx)48void sve_disable_per_world(per_world_context_t *per_world_ctx) 49 { 50 u_register_t reg; 51 52 /* Disable SVE and FPU since they share registers. */ 53 reg = per_world_ctx->ctx_cptr_el3; 54 reg &= ~CPTR_EZ_BIT; /* Trap SVE */ 55 reg |= TFP_BIT; /* Trap FPU/SIMD */ 56 per_world_ctx->ctx_cptr_el3 = reg; 57 } 58