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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | /* 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) /* Free all resources held by a thread */ #define release_thread(thread) do { } while (0) /* * 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 */ |