| /* |
| * Process/processor support for the Hexagon architecture |
| * |
| * Copyright (c) 2010-2011, 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 { |
| unsigned long long r1716; |
| unsigned long long r1918; |
| unsigned long long r2120; |
| unsigned long long r2322; |
| unsigned long long r2524; |
| unsigned long long r2726; |
| unsigned long fp; |
| unsigned long lr; |
| }; |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif |