/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* vineetg: March 2009
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* -Implemented task_pt_regs( )
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*
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* Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004
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*/
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#ifndef __ASM_ARC_PROCESSOR_H
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#define __ASM_ARC_PROCESSOR_H
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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/dsp.h>
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#include <asm/fpu.h>
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/* Arch specific stuff which needs to be saved per task.
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* However these items are not so important so as to earn a place in
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* struct thread_info
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*/
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struct thread_struct {
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unsigned long ksp; /* kernel mode stack pointer */
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unsigned long callee_reg; /* pointer to callee regs */
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unsigned long fault_address; /* dbls as brkpt holder as well */
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#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
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struct dsp_callee_regs dsp;
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#endif
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#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
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struct arc_fpu fpu;
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#endif
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};
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#define INIT_THREAD { \
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.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
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}
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/* Forward declaration, a strange C thing */
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struct task_struct;
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#define task_pt_regs(p) \
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((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
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/* Free all resources held by a thread */
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#define release_thread(thread) do { } while (0)
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/*
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* A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
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* get optimised away by gcc
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*/
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#define cpu_relax() barrier()
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
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/*
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* Where about of Task's sp, fp, blink when it was last seen in kernel mode.
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* Look in process.c for details of kernel stack layout
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*/
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#define TSK_K_ESP(tsk) (tsk->thread.ksp)
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#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \
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sizeof(struct callee_regs) + off)))
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#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
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#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
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extern void start_thread(struct pt_regs * regs, unsigned long pc,
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unsigned long usp);
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extern unsigned int get_wchan(struct task_struct *p);
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#endif /* !__ASSEMBLY__ */
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/*
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* Default System Memory Map on ARC
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*
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* ---------------------------- (lower 2G, Translated) -------------------------
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* 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE)
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* 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K)
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* 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..)
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*
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* PAGE_OFFSET ---------------- (Upper 2G, Untranslated) -----------------------
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* 0x8000_0000 0xBFFF_FFFF (kernel direct mapped)
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* 0xC000_0000 0xFFFF_FFFF (peripheral uncached space)
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* -----------------------------------------------------------------------------
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*/
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#define TASK_SIZE 0x60000000
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#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20))
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/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */
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#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4)
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#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
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#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
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#endif /* __ASM_ARC_PROCESSOR_H */
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