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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * 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>
- #include <asm/dsp.h>
- #include <asm/fpu.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_DSP_SAVE_RESTORE_REGS
- struct dsp_callee_regs dsp;
- #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;
- #define task_pt_regs(p) \
- ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
- /*
- * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
- * get optimised away by gcc
- */
- #define cpu_relax() barrier()
- #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);
- #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) - PMD_SIZE * 4)
- #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
- #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE)
- #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 /* __ASM_ARC_PROCESSOR_H */
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