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1/*
2 * Process/processor support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_PROCESSOR_H
22#define _ASM_PROCESSOR_H
23
24#ifndef __ASSEMBLY__
25
26#include <asm/mem-layout.h>
27#include <asm/registers.h>
28#include <asm/hexagon_vm.h>
29
30/* must be a macro */
31#define current_text_addr() ({ __label__ _l; _l: &&_l; })
32
33/* task_struct, defined elsewhere, is the "process descriptor" */
34struct task_struct;
35
36/* this is defined in arch/process.c */
37extern unsigned long thread_saved_pc(struct task_struct *tsk);
38
39extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
40
41/*
42 * thread_struct is supposed to be for context switch data.
43 * Specifically, to hold the state necessary to perform switch_to...
44 */
45struct thread_struct {
46 void *switch_sp;
47};
48
49/*
50 * initializes thread_struct
51 * The only thing we have in there is switch_sp
52 * which doesn't really need to be initialized.
53 */
54
55#define INIT_THREAD { \
56}
57
58#define cpu_relax() __vmyield()
59
60/*
61 * Decides where the kernel will search for a free chunk of vm space during
62 * mmaps.
63 * See also arch_get_unmapped_area.
64 * Doesn't affect if you have MAX_FIXED in the page flags set though...
65 *
66 * Apparently the convention is that ld.so will ask for "unmapped" private
67 * memory to be allocated SOMEWHERE, but it also asks for memory explicitly
68 * via MAP_FIXED at the lower * addresses starting at VA=0x0.
69 *
70 * If the two requests collide, you get authentic segfaulting action, so
71 * you have to kick the "unmapped" base requests higher up.
72 */
73#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE/3))
74
75
76#define task_pt_regs(task) \
77 ((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
78
79#define KSTK_EIP(tsk) (pt_elr(task_pt_regs(tsk)))
80#define KSTK_ESP(tsk) (pt_psp(task_pt_regs(tsk)))
81
82/* Free all resources held by a thread; defined in process.c */
83extern void release_thread(struct task_struct *dead_task);
84
85/* Get wait channel for task P. */
86extern unsigned long get_wchan(struct task_struct *p);
87
88/* The following stuff is pretty HEXAGON specific. */
89
90/* This is really just here for __switch_to.
91 Offsets are pulled via asm-offsets.c */
92
93/*
94 * No real reason why VM and native switch stacks should be different.
95 * Ultimately this should merge. Note that Rev C. ABI called out only
96 * R24-27 as callee saved GPRs needing explicit attention (R29-31 being
97 * dealt with automagically by allocframe), but the current ABI has
98 * more, R16-R27. By saving more, the worst case is that we waste some
99 * cycles if building with the old compilers.
100 */
101
102struct hexagon_switch_stack {
103 union {
104 struct {
105 unsigned long r16;
106 unsigned long r17;
107 };
108 unsigned long long r1716;
109 };
110 union {
111 struct {
112 unsigned long r18;
113 unsigned long r19;
114 };
115 unsigned long long r1918;
116 };
117 union {
118 struct {
119 unsigned long r20;
120 unsigned long r21;
121 };
122 unsigned long long r2120;
123 };
124 union {
125 struct {
126 unsigned long r22;
127 unsigned long r23;
128 };
129 unsigned long long r2322;
130 };
131 union {
132 struct {
133 unsigned long r24;
134 unsigned long r25;
135 };
136 unsigned long long r2524;
137 };
138 union {
139 struct {
140 unsigned long r26;
141 unsigned long r27;
142 };
143 unsigned long long r2726;
144 };
145
146 unsigned long fp;
147 unsigned long lr;
148};
149
150#endif /* !__ASSEMBLY__ */
151
152#endif
1/*
2 * Process/processor support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_PROCESSOR_H
22#define _ASM_PROCESSOR_H
23
24#ifndef __ASSEMBLY__
25
26#include <asm/mem-layout.h>
27#include <asm/registers.h>
28#include <asm/hexagon_vm.h>
29
30/* must be a macro */
31#define current_text_addr() ({ __label__ _l; _l: &&_l; })
32
33/* task_struct, defined elsewhere, is the "process descriptor" */
34struct task_struct;
35
36/* this is defined in arch/process.c */
37extern unsigned long thread_saved_pc(struct task_struct *tsk);
38
39extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
40
41/*
42 * thread_struct is supposed to be for context switch data.
43 * Specifically, to hold the state necessary to perform switch_to...
44 */
45struct thread_struct {
46 void *switch_sp;
47};
48
49/*
50 * initializes thread_struct
51 * The only thing we have in there is switch_sp
52 * which doesn't really need to be initialized.
53 */
54
55#define INIT_THREAD { \
56}
57
58#define cpu_relax() __vmyield()
59#define cpu_relax_lowlatency() cpu_relax()
60
61/*
62 * Decides where the kernel will search for a free chunk of vm space during
63 * mmaps.
64 * See also arch_get_unmapped_area.
65 * Doesn't affect if you have MAX_FIXED in the page flags set though...
66 *
67 * Apparently the convention is that ld.so will ask for "unmapped" private
68 * memory to be allocated SOMEWHERE, but it also asks for memory explicitly
69 * via MAP_FIXED at the lower * addresses starting at VA=0x0.
70 *
71 * If the two requests collide, you get authentic segfaulting action, so
72 * you have to kick the "unmapped" base requests higher up.
73 */
74#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE/3))
75
76
77#define task_pt_regs(task) \
78 ((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
79
80#define KSTK_EIP(tsk) (pt_elr(task_pt_regs(tsk)))
81#define KSTK_ESP(tsk) (pt_psp(task_pt_regs(tsk)))
82
83/* Free all resources held by a thread; defined in process.c */
84extern void release_thread(struct task_struct *dead_task);
85
86/* Get wait channel for task P. */
87extern unsigned long get_wchan(struct task_struct *p);
88
89/* The following stuff is pretty HEXAGON specific. */
90
91/* This is really just here for __switch_to.
92 Offsets are pulled via asm-offsets.c */
93
94/*
95 * No real reason why VM and native switch stacks should be different.
96 * Ultimately this should merge. Note that Rev C. ABI called out only
97 * R24-27 as callee saved GPRs needing explicit attention (R29-31 being
98 * dealt with automagically by allocframe), but the current ABI has
99 * more, R16-R27. By saving more, the worst case is that we waste some
100 * cycles if building with the old compilers.
101 */
102
103struct hexagon_switch_stack {
104 union {
105 struct {
106 unsigned long r16;
107 unsigned long r17;
108 };
109 unsigned long long r1716;
110 };
111 union {
112 struct {
113 unsigned long r18;
114 unsigned long r19;
115 };
116 unsigned long long r1918;
117 };
118 union {
119 struct {
120 unsigned long r20;
121 unsigned long r21;
122 };
123 unsigned long long r2120;
124 };
125 union {
126 struct {
127 unsigned long r22;
128 unsigned long r23;
129 };
130 unsigned long long r2322;
131 };
132 union {
133 struct {
134 unsigned long r24;
135 unsigned long r25;
136 };
137 unsigned long long r2524;
138 };
139 union {
140 struct {
141 unsigned long r26;
142 unsigned long r27;
143 };
144 unsigned long long r2726;
145 };
146
147 unsigned long fp;
148 unsigned long lr;
149};
150
151#endif /* !__ASSEMBLY__ */
152
153#endif