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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
- #ifdef __KERNEL__
- #ifndef __ASSEMBLY__
- #include <asm/arcregs.h> /* for STATUS_E1_MASK et all */
- /* 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 */
- unsigned long cause_code; /* Exception Cause Code (ECR) */
- #ifdef CONFIG_ARC_CURR_IN_REG
- unsigned long user_r25;
- #endif
- #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
- struct arc_fpu fpu;
- #endif
- };
- #define INIT_THREAD { \
- .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
- }
- /* Forward declaration, a strange C thing */
- struct task_struct;
- /*
- * Return saved PC of a blocked thread.
- */
- unsigned long thread_saved_pc(struct task_struct *t);
- #define task_pt_regs(p) \
- ((struct pt_regs *)(THREAD_SIZE - 4 + (void *)task_stack_page(p)) - 1)
- /* Free all resources held by a thread. */
- #define release_thread(thread) do { } while (0)
- /* Prepare to copy thread state - unlazy all lazy status */
- #define prepare_to_copy(tsk) do { } while (0)
- /*
- * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
- * get optimised away by gcc
- */
- #ifdef CONFIG_SMP
- #define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
- #else
- #define cpu_relax() do { } while (0)
- #endif
- #define copy_segments(tsk, mm) do { } while (0)
- #define release_segments(mm) do { } while (0)
- #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
- /*
- * Where abouts of Task's sp, fp, blink when it was last seen in kernel mode.
- * These can't be derived from pt_regs as that would give correp user-mode val
- */
- #define KSTK_ESP(tsk) (tsk->thread.ksp)
- #define KSTK_BLINK(tsk) (*((unsigned int *)((KSTK_ESP(tsk)) + (13+1+1)*4)))
- #define KSTK_FP(tsk) (*((unsigned int *)((KSTK_ESP(tsk)) + (13+1)*4)))
- /*
- * Do necessary setup to start up a newly executed thread.
- *
- * E1,E2 so that Interrupts are enabled in user mode
- * L set, so Loop inhibited to begin with
- * lp_start and lp_end seeded with bogus non-zero values so to easily catch
- * the ARC700 sr to lp_start hardware bug
- */
- #define start_thread(_regs, _pc, _usp) \
- do { \
- set_fs(USER_DS); /* reads from user space */ \
- (_regs)->ret = (_pc); \
- /* Interrupts enabled in User Mode */ \
- (_regs)->status32 = STATUS_U_MASK | STATUS_L_MASK \
- | STATUS_E1_MASK | STATUS_E2_MASK; \
- (_regs)->sp = (_usp); \
- /* bogus seed values for debugging */ \
- (_regs)->lp_start = 0x10; \
- (_regs)->lp_end = 0x80; \
- } while (0)
- 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__ */
- /* Kernels Virtual memory area.
- * Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a
- * "kernel translated" region (like KSEG2 in MIPS). So we use a upper part
- * of the translated bottom 2GB for kernel virtual memory and protect
- * these pages from user accesses by disabling Ru, Eu and Wu.
- */
- #define VMALLOC_SIZE (0x10000000) /* 256M */
- #define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
- #define VMALLOC_END (PAGE_OFFSET)
- /* Most of the architectures seem to be keeping some kind of padding between
- * userspace TASK_SIZE and PAGE_OFFSET. i.e TASK_SIZE != PAGE_OFFSET.
- */
- #define USER_KERNEL_GUTTER 0x10000000
- /* User address space:
- * On ARC700, CPU allows the entire lower half of 32 bit address space to be
- * translated. Thus potentially 2G (0:0x7FFF_FFFF) could be User vaddr space.
- * However we steal 256M for kernel addr (0x7000_0000:0x7FFF_FFFF) and another
- * 256M (0x6000_0000:0x6FFF_FFFF) is gutter between user/kernel spaces
- * Thus total User vaddr space is (0:0x5FFF_FFFF)
- */
- #define TASK_SIZE (PAGE_OFFSET - VMALLOC_SIZE - USER_KERNEL_GUTTER)
- #define STACK_TOP TASK_SIZE
- #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 /* __KERNEL__ */
- #endif /* __ASM_ARC_PROCESSOR_H */
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