| /* 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 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 { } |
| |
| /* 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) (task_thread_info(tsk)->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 */ |
