134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Process/processor support for the Hexagon architecture
|
|
*
|
|
* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _ASM_PROCESSOR_H
|
|
#define _ASM_PROCESSOR_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/mem-layout.h>
|
|
#include <asm/registers.h>
|
|
#include <asm/hexagon_vm.h>
|
|
|
|
/* task_struct, defined elsewhere, is the "process descriptor" */
|
|
struct task_struct;
|
|
|
|
extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
|
|
|
|
/*
|
|
* thread_struct is supposed to be for context switch data.
|
|
* Specifically, to hold the state necessary to perform switch_to...
|
|
*/
|
|
struct thread_struct {
|
|
void *switch_sp;
|
|
};
|
|
|
|
/*
|
|
* initializes thread_struct
|
|
* The only thing we have in there is switch_sp
|
|
* which doesn't really need to be initialized.
|
|
*/
|
|
|
|
#define INIT_THREAD { \
|
|
}
|
|
|
|
#define cpu_relax() __vmyield()
|
|
|
|
/*
|
|
* Decides where the kernel will search for a free chunk of vm space during
|
|
* mmaps.
|
|
* See also arch_get_unmapped_area.
|
|
* Doesn't affect if you have MAX_FIXED in the page flags set though...
|
|
*
|
|
* Apparently the convention is that ld.so will ask for "unmapped" private
|
|
* memory to be allocated SOMEWHERE, but it also asks for memory explicitly
|
|
* via MAP_FIXED at the lower * addresses starting at VA=0x0.
|
|
*
|
|
* If the two requests collide, you get authentic segfaulting action, so
|
|
* you have to kick the "unmapped" base requests higher up.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE/3))
|
|
|
|
|
|
#define task_pt_regs(task) \
|
|
((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)
|
|
|
|
#define KSTK_EIP(tsk) (pt_elr(task_pt_regs(tsk)))
|
|
#define KSTK_ESP(tsk) (pt_psp(task_pt_regs(tsk)))
|
|
|
|
/* Free all resources held by a thread; defined in process.c */
|
|
extern void release_thread(struct task_struct *dead_task);
|
|
|
|
/* Get wait channel for task P. */
|
|
extern unsigned long get_wchan(struct task_struct *p);
|
|
|
|
/* The following stuff is pretty HEXAGON specific. */
|
|
|
|
/* This is really just here for __switch_to.
|
|
Offsets are pulled via asm-offsets.c */
|
|
|
|
/*
|
|
* No real reason why VM and native switch stacks should be different.
|
|
* Ultimately this should merge. Note that Rev C. ABI called out only
|
|
* R24-27 as callee saved GPRs needing explicit attention (R29-31 being
|
|
* dealt with automagically by allocframe), but the current ABI has
|
|
* more, R16-R27. By saving more, the worst case is that we waste some
|
|
* cycles if building with the old compilers.
|
|
*/
|
|
|
|
struct hexagon_switch_stack {
|
|
union {
|
|
struct {
|
|
unsigned long r16;
|
|
unsigned long r17;
|
|
};
|
|
unsigned long long r1716;
|
|
};
|
|
union {
|
|
struct {
|
|
unsigned long r18;
|
|
unsigned long r19;
|
|
};
|
|
unsigned long long r1918;
|
|
};
|
|
union {
|
|
struct {
|
|
unsigned long r20;
|
|
unsigned long r21;
|
|
};
|
|
unsigned long long r2120;
|
|
};
|
|
union {
|
|
struct {
|
|
unsigned long r22;
|
|
unsigned long r23;
|
|
};
|
|
unsigned long long r2322;
|
|
};
|
|
union {
|
|
struct {
|
|
unsigned long r24;
|
|
unsigned long r25;
|
|
};
|
|
unsigned long long r2524;
|
|
};
|
|
union {
|
|
struct {
|
|
unsigned long r26;
|
|
unsigned long r27;
|
|
};
|
|
unsigned long long r2726;
|
|
};
|
|
|
|
unsigned long fp;
|
|
unsigned long lr;
|
|
};
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif
|