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Linux/arch/hexagon/include/asm/processor.h

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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" */
 34 struct task_struct;
 35 
 36 /*  this is defined in arch/process.c  */
 37 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 38 
 39 extern 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  */
 45 struct 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  */
 84 extern void release_thread(struct task_struct *dead_task);
 85 
 86 /* Get wait channel for task P.  */
 87 extern 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 
103 struct 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
154 

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