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<
/*
 * 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
="kt">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() #define cpu_relax_lowlatency() cpu_relax() /* * 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