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/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * vineetg: March 2009
 *  -Implemented task_pt_regs( )
 *
 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
 */

#ifndef __ASM_ARC_PROCESSOR_H
#define __ASM_ARC_PROCESSOR_H

#ifndef __ASSEMBLY__

#include <asm/ptrace.h>

#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
/* These DPFP regs need to be saved/restored across ctx-sw */
struct arc_fpu {
	struct {
		unsigned int l, h;
	} aux_dpfp[2];
};
#endif

#ifdef CONFIG_ARC_PLAT_EZNPS
struct eznps_dp {
	unsigned int eflags;
	unsigned int gpa1;
};
#endif

/* Arch specific stuff which needs to be saved per task.
 * However these items are not so important so as to earn a place in
 * struct thread_info
 */
struct thread_struct {
	unsigned long ksp;	/* kernel mode stack pointer */
	unsigned long callee_reg;	/* pointer to callee regs */
	unsigned long fault_address;	/* dbls as brkpt holder as well */
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
	struct arc_fpu fpu;
#endif
#ifdef CONFIG_ARC_PLAT_EZNPS
	struct eznps_dp dp;
#endif
};

#define INIT_THREAD  {                          \
	.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
}

/* Forward declaration, a strange C thing */
struct task_struct;

#define task_pt_regs(p) \
	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)

/* Free all resources held by a thread */
#define release_thread(thread) do { } while (0)

/*
 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
 * get optimised away by gcc
 */
#ifndef CONFIG_EZNPS_MTM_EXT

#define cpu_relax()		barrier()

#else

#define cpu_relax()     \
	__asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")

#endif

#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->ret)
#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)

/*
 * Where about of Task's sp, fp, blink when it was last seen in kernel mode.
 * Look in process.c for details of kernel stack layout
 */
#define TSK_K_ESP(tsk)		(tsk->thread.ksp)

#define TSK_K_REG(tsk, off)	(*((unsigned long *)(TSK_K_ESP(tsk) + \
					sizeof(struct callee_regs) + off)))

#define TSK_K_BLINK(tsk)	TSK_K_REG(tsk, 4)
#define TSK_K_FP(tsk)		TSK_K_REG(tsk, 0)

extern void start_thread(struct pt_regs * regs, unsigned long pc,
			 unsigned long usp);

extern unsigned int get_wchan(struct task_struct *p);

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 * Should the PC register be read instead ? This macro does not seem to
 * be used in many places so this wont be all that bad.
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l; })

#endif /* !__ASSEMBLY__ */

/*
 * Default System Memory Map on ARC
 *
 * ---------------------------- (lower 2G, Translated) -------------------------
 * 0x0000_0000		0x5FFF_FFFF	(user vaddr: TASK_SIZE)
 * 0x6000_0000		0x6FFF_FFFF	(reserved gutter between U/K)
 * 0x7000_0000		0x7FFF_FFFF	(kvaddr: vmalloc/modules/pkmap..)
 *
 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
 * 0x8000_0000		0xBFFF_FFFF	(kernel direct mapped)
 * 0xC000_0000		0xFFFF_FFFF	(peripheral uncached space)
 * -----------------------------------------------------------------------------
 */

#define TASK_SIZE	0x60000000

#define VMALLOC_START	(PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))

/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
#define VMALLOC_SIZE	((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)

#define VMALLOC_END	(VMALLOC_START + VMALLOC_SIZE)

#define USER_KERNEL_GUTTER    (VMALLOC_START - TASK_SIZE)

#ifdef CONFIG_ARC_PLAT_EZNPS
/* NPS architecture defines special window of 129M in user address space for
 * special memory areas, when accessing this window the MMU do not use TLB.
 * Instead MMU direct the access to:
 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM)
 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs)
 *
 * CMEM - is the fastest memory we got and its size is 16K.
 * FMT  - is used to map either to internal/external memory.
 * Internal memory is the second fast memory and its size is 16M
 * External memory is the biggest memory (16G) and also the slowest.
 *
 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000.
 */
#define STACK_TOP       0x57e00000
#else
#define STACK_TOP       TASK_SIZE
#endif

#define STACK_TOP_MAX   STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)

#endif /* __ASM_ARC_PROCESSOR_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 681 B 0644
arcregs.h File 8.59 KB 0644
asm-offsets.h File 311 B 0644
atomic.h File 15.14 KB 0644
barrier.h File 1.75 KB 0644
bitops.h File 9.81 KB 0644
bug.h File 938 B 0644
cache.h File 3.77 KB 0644
cacheflush.h File 3.88 KB 0644
checksum.h File 2.45 KB 0644
cmpxchg.h File 5.4 KB 0644
current.h File 695 B 0644
delay.h File 1.99 KB 0644
disasm.h File 3.87 KB 0644
dma-mapping.h File 734 B 0644
dma.h File 459 B 0644
dwarf.h File 892 B 0644
elf.h File 2.15 KB 0644
entry-arcv2.h File 4.85 KB 0644
entry-compact.h File 9.29 KB 0644
entry.h File 6.73 KB 0644
exec.h File 410 B 0644
fb.h File 411 B 0644
futex.h File 3.67 KB 0644
highmem.h File 1.46 KB 0644
hugepage.h File 2.41 KB 0644
io.h File 6.43 KB 0644
irq.h File 825 B 0644
irqflags-arcv2.h File 3.45 KB 0644
irqflags-compact.h File 4.25 KB 0644
irqflags.h File 509 B 0644
kdebug.h File 400 B 0644
kgdb.h File 1.35 KB 0644
kmap_types.h File 489 B 0644
kprobes.h File 1.37 KB 0644
linkage.h File 1.42 KB 0644
mach_desc.h File 2.06 KB 0644
mmu.h File 2.44 KB 0644
mmu_context.h File 5.67 KB 0644
mmzone.h File 989 B 0644
module.h File 661 B 0644
page.h File 2.99 KB 0644
pci.h File 705 B 0644
perf_event.h File 6.86 KB 0644
pgalloc.h File 3.79 KB 0644
pgtable.h File 14.2 KB 0644
processor.h File 4.69 KB 0644
ptrace.h File 3.87 KB 0644
sections.h File 407 B 0644
segment.h File 612 B 0644
serial.h File 644 B 0644
setup.h File 1.18 KB 0644
shmparam.h File 442 B 0644
smp.h File 4.25 KB 0644
spinlock.h File 8.79 KB 0644
spinlock_types.h File 1.03 KB 0644
stacktrace.h File 1.29 KB 0644
string.h File 1.15 KB 0644
switch_to.h File 1.17 KB 0644
syscall.h File 1.57 KB 0644
syscalls.h File 653 B 0644
thread_info.h File 3.39 KB 0644
timex.h File 508 B 0644
tlb-mmu1.h File 3.48 KB 0644
tlb.h File 1.23 KB 0644
tlbflush.h File 1.76 KB 0644
uaccess.h File 18.45 KB 0644
unaligned.h File 771 B 0644
unwind.h File 3.51 KB 0644