1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 * 5 * vineetg: March 2009 6 * -Implemented task_pt_regs( ) 7 * 8 * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004 9 */ 10 11 #ifndef __ASM_ARC_PROCESSOR_H 12 #define __ASM_ARC_PROCESSOR_H 13 14 #ifndef __ASSEMBLY__ 15 16 #include <asm/ptrace.h> 17 #include <asm/dsp.h> 18 #include <asm/fpu.h> 19 20 /* Arch specific stuff which needs to be saved per task. 21 * However these items are not so important so as to earn a place in 22 * struct thread_info 23 */ 24 struct thread_struct { 25 unsigned long callee_reg; /* pointer to callee regs */ 26 unsigned long fault_address; /* dbls as brkpt holder as well */ 27 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 28 struct dsp_callee_regs dsp; 29 #endif 30 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 31 struct arc_fpu fpu; 32 #endif 33 }; 34 35 #define INIT_THREAD { } 36 37 /* Forward declaration, a strange C thing */ 38 struct task_struct; 39 40 #define task_pt_regs(p) \ 41 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 42 43 /* 44 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 45 * get optimised away by gcc 46 */ 47 #define cpu_relax() barrier() 48 49 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 50 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 51 52 /* 53 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 54 * Look in process.c for details of kernel stack layout 55 */ 56 #define TSK_K_ESP(tsk) (task_thread_info(tsk)->ksp) 57 58 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 59 sizeof(struct callee_regs) + off))) 60 61 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 62 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 63 64 extern void start_thread(struct pt_regs * regs, unsigned long pc, 65 unsigned long usp); 66 67 extern unsigned int __get_wchan(struct task_struct *p); 68 69 #endif /* !__ASSEMBLY__ */ 70 71 /* 72 * Default System Memory Map on ARC 73 * 74 * ---------------------------- (lower 2G, Translated) ------------------------- 75 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 76 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 77 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 78 * 79 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 80 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 81 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 82 * ----------------------------------------------------------------------------- 83 */ 84 85 #define TASK_SIZE 0x60000000 86 87 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 88 89 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 90 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PMD_SIZE * 4) 91 92 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 93 94 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 95 96 #define STACK_TOP TASK_SIZE 97 #define STACK_TOP_MAX STACK_TOP 98 99 /* This decides where the kernel will search for a free chunk of vm 100 * space during mmap's. 101 */ 102 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 103 104 #endif /* __ASM_ARC_PROCESSOR_H */ 105