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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 <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;

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

Filemanager

Name Type Size Permission Actions
Kbuild File 886 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.27 KB 0644
bitops.h File 6.62 KB 0644
cache.h File 1.16 KB 0644
cacheflush.h File 3.8 KB 0644
checksum.h File 1.61 KB 0644
cmpxchg.h File 2.55 KB 0644
delay.h File 978 B 0644
dma-mapping.h File 1.31 KB 0644
dma.h File 934 B 0644
elf.h File 6.34 KB 0644
exec.h File 1.01 KB 0644
fixmap.h File 1.11 KB 0644
fpu.h File 90 B 0644
futex.h File 2.25 KB 0644
hexagon_vm.h File 6.39 KB 0644
intrinsics.h File 1003 B 0644
io.h File 6.95 KB 0644
irq.h File 1.13 KB 0644
irqflags.h File 1.46 KB 0644
kgdb.h File 1.36 KB 0644
linkage.h File 871 B 0644
mem-layout.h File 3.42 KB 0644
mmu.h File 1.1 KB 0644
mmu_context.h File 2.59 KB 0644
module.h File 910 B 0644
page.h File 4.74 KB 0644
perf_event.h File 841 B 0644
pgalloc.h File 4.08 KB 0644
pgtable.h File 14.15 KB 0644
processor.h File 3.8 KB 0644
smp.h File 1.31 KB 0644
spinlock.h File 3.84 KB 0644
spinlock_types.h File 1.15 KB 0644
string.h File 1.08 KB 0644
suspend.h File 872 B 0644
switch_to.h File 1.09 KB 0644
syscall.h File 1.38 KB 0644
thread_info.h File 4.05 KB 0644
time.h File 980 B 0644
timer-regs.h File 1.23 KB 0644
timex.h File 1.13 KB 0644
tlb.h File 1.21 KB 0644
tlbflush.h File 2.08 KB 0644
traps.h File 1.02 KB 0644
uaccess.h File 3.67 KB 0644
vdso.h File 941 B 0644
vm_fault.h File 993 B 0644
vm_mmu.h File 3.37 KB 0644