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 ksp; /* kernel mode stack pointer */ 26 unsigned long callee_reg; /* pointer to callee regs */ 27 unsigned long fault_address; /* dbls as brkpt holder as well */ 28 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 29 struct dsp_callee_regs dsp; 30 #endif 31 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 32 struct arc_fpu fpu; 33 #endif 34 }; 35 36 #define INIT_THREAD { \ 37 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 38 } 39 40 /* Forward declaration, a strange C thing */ 41 struct task_struct; 42 43 #define task_pt_regs(p) \ 44 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 45 46 /* Free all resources held by a thread */ 47 #define release_thread(thread) do { } while (0) 48 49 /* 50 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 51 * get optimised away by gcc 52 */ 53 #define cpu_relax() barrier() 54 55 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 56 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 57 58 /* 59 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 60 * Look in process.c for details of kernel stack layout 61 */ 62 #define TSK_K_ESP(tsk) (tsk->thread.ksp) 63 64 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 65 sizeof(struct callee_regs) + off))) 66 67 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 68 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 69 70 extern void start_thread(struct pt_regs * regs, unsigned long pc, 71 unsigned long usp); 72 73 extern unsigned int get_wchan(struct task_struct *p); 74 75 #endif /* !__ASSEMBLY__ */ 76 77 /* 78 * Default System Memory Map on ARC 79 * 80 * ---------------------------- (lower 2G, Translated) ------------------------- 81 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 82 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 83 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 84 * 85 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 86 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 87 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 88 * ----------------------------------------------------------------------------- 89 */ 90 91 #define TASK_SIZE 0x60000000 92 93 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 94 95 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 96 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) 97 98 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 99 100 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 101 102 #define STACK_TOP TASK_SIZE 103 #define STACK_TOP_MAX STACK_TOP 104 105 /* This decides where the kernel will search for a free chunk of vm 106 * space during mmap's. 107 */ 108 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 109 110 #endif /* __ASM_ARC_PROCESSOR_H */ 111