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Diffstat (limited to 'arch/hexagon/include/asm/processor.h')
| -rw-r--r-- | arch/hexagon/include/asm/processor.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/processor.h b/arch/hexagon/include/asm/processor.h new file mode 100644 index 00000000000..20c5ddabbd8 --- /dev/null +++ b/arch/hexagon/include/asm/processor.h @@ -0,0 +1,123 @@ +/* + * Process/processor support for the Hexagon architecture + * + * Copyright (c) 2010-2011, Code Aurora Forum. 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 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); +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() + +/* + * "Unlazying all lazy status" occurs here. + */ +static inline void prepare_to_copy(struct task_struct *tsk) +{ +} + +/* + * 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 |