1 /*
2  * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
3  * Copyright (C) 2004 Microtronix Datacom Ltd.
4  *
5  * This file is subject to the terms and conditions of the GNU General Public
6  * License. See the file "COPYING" in the main directory of this archive
7  * for more details.
8  */
9 
10 #ifndef _ASM_NIOS2_ENTRY_H
11 #define _ASM_NIOS2_ENTRY_H
12 
13 #ifdef __ASSEMBLY__
14 
15 #include <asm/processor.h>
16 #include <asm/registers.h>
17 #include <asm/asm-offsets.h>
18 
19 /*
20  * Standard Nios2 interrupt entry and exit macros.
21  * Must be called with interrupts disabled.
22  */
23 .macro SAVE_ALL
24 	rdctl	r24, estatus
25 	andi	r24, r24, ESTATUS_EU
26 	beq	r24, r0, 1f /* In supervisor mode, already on kernel stack */
27 
28 	movia	r24, _current_thread	/* Switch to current kernel stack */
29 	ldw	r24, 0(r24)		/* using the thread_info */
30 	addi	r24, r24, THREAD_SIZE-PT_REGS_SIZE
31 	stw	sp, PT_SP(r24)		/* Save user stack before changing */
32 	mov	sp, r24
33 	br	2f
34 
35 1 :	mov	r24, sp
36 	addi	sp, sp, -PT_REGS_SIZE	/* Backup the kernel stack pointer */
37 	stw	r24, PT_SP(sp)
38 2 :	stw	r1, PT_R1(sp)
39 	stw	r2, PT_R2(sp)
40 	stw	r3, PT_R3(sp)
41 	stw	r4, PT_R4(sp)
42 	stw	r5, PT_R5(sp)
43 	stw	r6, PT_R6(sp)
44 	stw	r7, PT_R7(sp)
45 	stw	r8, PT_R8(sp)
46 	stw	r9, PT_R9(sp)
47 	stw	r10, PT_R10(sp)
48 	stw	r11, PT_R11(sp)
49 	stw	r12, PT_R12(sp)
50 	stw	r13, PT_R13(sp)
51 	stw	r14, PT_R14(sp)
52 	stw	r15, PT_R15(sp)
53 	movi	r24, -1
54 	stw	r24, PT_ORIG_R2(sp)
55 	stw	r7, PT_ORIG_R7(sp)
56 
57 	stw	ra, PT_RA(sp)
58 	stw	fp, PT_FP(sp)
59 	stw	gp, PT_GP(sp)
60 	rdctl	r24, estatus
61 	stw	r24, PT_ESTATUS(sp)
62 	stw	ea, PT_EA(sp)
63 .endm
64 
65 .macro RESTORE_ALL
66 	ldw	r1, PT_R1(sp)		/* Restore registers */
67 	ldw	r2, PT_R2(sp)
68 	ldw	r3, PT_R3(sp)
69 	ldw	r4, PT_R4(sp)
70 	ldw	r5, PT_R5(sp)
71 	ldw	r6, PT_R6(sp)
72 	ldw	r7, PT_R7(sp)
73 	ldw	r8, PT_R8(sp)
74 	ldw	r9, PT_R9(sp)
75 	ldw	r10, PT_R10(sp)
76 	ldw	r11, PT_R11(sp)
77 	ldw	r12, PT_R12(sp)
78 	ldw	r13, PT_R13(sp)
79 	ldw	r14, PT_R14(sp)
80 	ldw	r15, PT_R15(sp)
81 	ldw	ra, PT_RA(sp)
82 	ldw	fp, PT_FP(sp)
83 	ldw	gp, PT_GP(sp)
84 	ldw	r24, PT_ESTATUS(sp)
85 	wrctl	estatus, r24
86 	ldw	ea, PT_EA(sp)
87 	ldw	sp, PT_SP(sp)		/* Restore sp last */
88 .endm
89 
90 .macro	SAVE_SWITCH_STACK
91 	addi	sp, sp, -SWITCH_STACK_SIZE
92 	stw	r16, SW_R16(sp)
93 	stw	r17, SW_R17(sp)
94 	stw	r18, SW_R18(sp)
95 	stw	r19, SW_R19(sp)
96 	stw	r20, SW_R20(sp)
97 	stw	r21, SW_R21(sp)
98 	stw	r22, SW_R22(sp)
99 	stw	r23, SW_R23(sp)
100 	stw	fp, SW_FP(sp)
101 	stw	gp, SW_GP(sp)
102 	stw	ra, SW_RA(sp)
103 .endm
104 
105 .macro	RESTORE_SWITCH_STACK
106 	ldw	r16, SW_R16(sp)
107 	ldw	r17, SW_R17(sp)
108 	ldw	r18, SW_R18(sp)
109 	ldw	r19, SW_R19(sp)
110 	ldw	r20, SW_R20(sp)
111 	ldw	r21, SW_R21(sp)
112 	ldw	r22, SW_R22(sp)
113 	ldw	r23, SW_R23(sp)
114 	ldw	fp, SW_FP(sp)
115 	ldw	gp, SW_GP(sp)
116 	ldw	ra, SW_RA(sp)
117 	addi	sp, sp, SWITCH_STACK_SIZE
118 .endm
119 
120 #endif /* __ASSEMBLY__ */
121 #endif /* _ASM_NIOS2_ENTRY_H */
122