forked from Minki/linux
38a9ff6d24
With ECR now part of pt_regs * No need to propagate from lowest asm handlers as arg * No need to save it in tsk->thread.cause_code * Avoid bit chopping to access the bit-fields More code consolidation, cleanup Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/*
|
|
* 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 */
|
|
#include <asm/ptrace.h>
|
|
|
|
/* 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
|
|
};
|
|
|
|
#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 + (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.
|
|
* Look in process.c for details of kernel stack layout
|
|
*/
|
|
#define KSTK_ESP(tsk) (tsk->thread.ksp)
|
|
|
|
#define KSTK_REG(tsk, off) (*((unsigned int *)(KSTK_ESP(tsk) + \
|
|
sizeof(struct callee_regs) + off)))
|
|
|
|
#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)
|
|
#define KSTK_FP(tsk) KSTK_REG(tsk, 0)
|
|
|
|
/*
|
|
* 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 */
|