1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Cavium, Inc
3 */
4
5 #include <rte_common.h>
6 #include <ctx.h>
7
8 void
ctx_switch(struct ctx * new_ctx __rte_unused,struct ctx * curr_ctx __rte_unused)9 ctx_switch(struct ctx *new_ctx __rte_unused, struct ctx *curr_ctx __rte_unused)
10 {
11 /* SAVE CURRENT CONTEXT */
12 asm volatile (
13 /* Save SP */
14 "mov x3, sp\n"
15 "str x3, [x1, #0]\n"
16
17 /* Save FP and LR */
18 "stp x29, x30, [x1, #8]\n"
19
20 /* Save Callee Saved Regs x19 - x28 */
21 "stp x19, x20, [x1, #24]\n"
22 "stp x21, x22, [x1, #40]\n"
23 "stp x23, x24, [x1, #56]\n"
24 "stp x25, x26, [x1, #72]\n"
25 "stp x27, x28, [x1, #88]\n"
26
27 /*
28 * Save bottom 64-bits of Callee Saved
29 * SIMD Regs v8 - v15
30 */
31 "stp d8, d9, [x1, #104]\n"
32 "stp d10, d11, [x1, #120]\n"
33 "stp d12, d13, [x1, #136]\n"
34 "stp d14, d15, [x1, #152]\n"
35 );
36
37 /* RESTORE NEW CONTEXT */
38 asm volatile (
39 /* Restore SP */
40 "ldr x3, [x0, #0]\n"
41 "mov sp, x3\n"
42
43 /* Restore FP and LR */
44 "ldp x29, x30, [x0, #8]\n"
45
46 /* Restore Callee Saved Regs x19 - x28 */
47 "ldp x19, x20, [x0, #24]\n"
48 "ldp x21, x22, [x0, #40]\n"
49 "ldp x23, x24, [x0, #56]\n"
50 "ldp x25, x26, [x0, #72]\n"
51 "ldp x27, x28, [x0, #88]\n"
52
53 /*
54 * Restore bottom 64-bits of Callee Saved
55 * SIMD Regs v8 - v15
56 */
57 "ldp d8, d9, [x0, #104]\n"
58 "ldp d10, d11, [x0, #120]\n"
59 "ldp d12, d13, [x0, #136]\n"
60 "ldp d14, d15, [x0, #152]\n"
61 );
62 }
63