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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130/* 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)))
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