/* * Process/processor support for the Hexagon architecture * * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #ifndef _ASM_PROCESSOR_H#define _ASM_PROCESSOR_H #ifndef __ASSEMBLY__ #include <asm/mem-layout.h>#include <asm/registers.h>#include <asm/hexagon_vm.h> /*  must be a macro  */#define current_text_addr() ({ __label__ _l; _l: &&_l; }) /*  task_struct, defined elsewhere, is the "process descriptor" */struct task_struct; /*  this is defined in arch/process.c  */extern unsigned long thread_saved_pc(struct task_struct *tsk); 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