aboutsummaryrefslogtreecommitdiffstats
path: root/arch/tile/mm/migrate_64.S
blob: 1d15b10833d113ee077f8ea032503819ea4c257e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * Copyright 2011 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 * This routine is a helper for migrating the home of a set of pages to
 * a new cpu.  See the documentation in homecache.c for more information.
 */

#include <linux/linkage.h>
#include <linux/threads.h>
#include <asm/page.h>
#include <asm/thread_info.h>
#include <asm/types.h>
#include <asm/asm-offsets.h>
#include <hv/hypervisor.h>

	.text

/*
 * First, some definitions that apply to all the code in the file.
 */

/* Locals (caller-save) */
#define r_tmp		r10
#define r_save_sp	r11

/* What we save where in the stack frame; must include all callee-saves. */
#define FRAME_SP	8
#define FRAME_R30	16
#define FRAME_R31	24
#define FRAME_R32	32
#define FRAME_SIZE	40




/*
 * On entry:
 *
 *   r0 the new context PA to install (moved to r_context)
 *   r1 PTE to use for context access (moved to r_access)
 *   r2 ASID to use for new context (moved to r_asid)
 *   r3 pointer to cpumask with just this cpu set in it (r_my_cpumask)
 */

/* Arguments (caller-save) */
#define r_context_in	r0
#define r_access_in	r1
#define r_asid_in	r2
#define r_my_cpumask	r3

/* Locals (callee-save); must not be more than FRAME_xxx above. */
#define r_context	r30
#define r_access	r31
#define r_asid		r32

/*
 * Caller-save locals and frame constants are the same as
 * for homecache_migrate_stack_and_flush.
 */

STD_ENTRY(flush_and_install_context)
	/*
	 * Create a stack frame; we can't touch it once we flush the
	 * cache until we install the new page table and flush the TLB.
	 */
	{
	 move r_save_sp, sp
	 st sp, lr
	 addi sp, sp, -FRAME_SIZE
	}
	addi r_tmp, sp, FRAME_SP
	{
	 st r_tmp, r_save_sp
	 addi r_tmp, sp, FRAME_R30
	}
	{
	 st r_tmp, r30
	 addi r_tmp, sp, FRAME_R31
	}
	{
	 st r_tmp, r31
	 addi r_tmp, sp, FRAME_R32
	}
	st r_tmp, r32

	/* Move some arguments to callee-save registers. */
	{
	 move r_context, r_context_in
	 move r_access, r_access_in
	}
	move r_asid, r_asid_in

	/* First, flush our L2 cache. */
	{
	 move r0, zero  /* cache_pa */
	 moveli r1, hw2_last(HV_FLUSH_EVICT_L2)  /* cache_control */
	}
	{
	 shl16insli r1, r1, hw1(HV_FLUSH_EVICT_L2)
	 move r2, r_my_cpumask  /* cache_cpumask */
	}
	{
	 shl16insli r1, r1, hw0(HV_FLUSH_EVICT_L2)
	 move r3, zero  /* tlb_va */
	}
	{
	 move r4, zero  /* tlb_length */
	 move r5, zero  /* tlb_pgsize */
	}
	{
	 move r6, zero  /* tlb_cpumask */
	 move r7, zero  /* asids */
	}
	{
	 move r8, zero  /* asidcount */
	 jal hv_flush_remote
	}
	bnez r0, 1f

	/* Now install the new page table. */
	{
	 move r0, r_context
	 move r1, r_access
	}
	{
	 move r2, r_asid
	 moveli r3, HV_CTX_DIRECTIO | CTX_PAGE_FLAG
	}
	jal hv_install_context
	bnez r0, 1f

	/* Finally, flush the TLB. */
	{
	 movei r0, 0   /* preserve_global */
	 jal hv_flush_all
	}

1:	/* Restore the callee-saved registers and return. */
	addli lr, sp, FRAME_SIZE
	{
	 ld lr, lr
	 addli r_tmp, sp, FRAME_R30
	}
	{
	 ld r30, r_tmp
	 addli r_tmp, sp, FRAME_R31
	}
	{
	 ld r31, r_tmp
	 addli r_tmp, sp, FRAME_R32
	}
	{
	 ld r32, r_tmp
	 addi sp, sp, FRAME_SIZE
	}
	jrp lr
	STD_ENDPROC(flush_and_install_context)