xref: /rk3399_ARM-atf/lib/extensions/sve/sve.c (revision 513faf511eabe9f685cd47fc9604554cc361e9d8)
1 /*
2  * Copyright (c) 2017-2025, 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 
25 void sve_init_el3(void)
26 {
27 	/* Restrict maximum SVE vector length (SVE_VECTOR_LEN+1) * 128. */
28 	write_zcr_el3(ZCR_EL3_LEN_MASK & CONVERT_SVE_LENGTH(SVE_VECTOR_LEN));
29 }
30 
31 void sve_enable_per_world(per_world_context_t *per_world_ctx)
32 {
33 	u_register_t cptr_el3;
34 
35 	/* Enable access to SVE functionality for all ELs. */
36 	cptr_el3 = per_world_ctx->ctx_cptr_el3;
37 	cptr_el3 = (cptr_el3 | CPTR_EZ_BIT);
38 	per_world_ctx->ctx_cptr_el3 = cptr_el3;
39 }
40 
41 void sve_init_el2_unused(void)
42 {
43 	u_register_t reg;
44 
45 	/*
46 	 * CPTR_EL2.TZ: Set to zero so that no SVE instruction execution is
47 	 *  trapped.
48 	 *
49 	 * CPTR_EL2.ZEN: Set to 0b11 so that no SVE instruction execution is
50 	 *  trapped.
51 	 */
52 	reg = read_cptr_el2();
53 	reg &= ~(CPTR_EL2_TZ_BIT);
54 	reg |= ULL(3) << CPTR_EL2_ZEN_SHIFT;
55 	write_cptr_el2(reg);
56 }
57 
58 void sve_disable_per_world(per_world_context_t *per_world_ctx)
59 {
60 	u_register_t reg;
61 
62 	/* Disable SVE and FPU since they share registers. */
63 	reg = per_world_ctx->ctx_cptr_el3;
64 	reg &= ~CPTR_EZ_BIT;	/* Trap SVE */
65 	per_world_ctx->ctx_cptr_el3 = reg;
66 }
67