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