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133 lines
3.1 KiB
133 lines
3.1 KiB
/* 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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