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
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