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/fpu.h> 18 19 #ifdef CONFIG_ARC_PLAT_EZNPS 20 struct eznps_dp { 21 unsigned int eflags; 22 unsigned int gpa1; 23 }; 24 #endif 25 26 /* Arch specific stuff which needs to be saved per task. 27 * However these items are not so important so as to earn a place in 28 * struct thread_info 29 */ 30 struct thread_struct { 31 unsigned long ksp; /* kernel mode stack pointer */ 32 unsigned long callee_reg; /* pointer to callee regs */ 33 unsigned long fault_address; /* dbls as brkpt holder as well */ 34 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 35 struct arc_fpu fpu; 36 #endif 37 #ifdef CONFIG_ARC_PLAT_EZNPS 38 struct eznps_dp dp; 39 #endif 40 }; 41 42 #define INIT_THREAD { \ 43 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 44 } 45 46 /* Forward declaration, a strange C thing */ 47 struct task_struct; 48 49 #define task_pt_regs(p) \ 50 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 51 52 /* Free all resources held by a thread */ 53 #define release_thread(thread) do { } while (0) 54 55 /* 56 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 57 * get optimised away by gcc 58 */ 59 #ifndef CONFIG_EZNPS_MTM_EXT 60 61 #define cpu_relax() barrier() 62 63 #else 64 65 #define cpu_relax() \ 66 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") 67 68 #endif 69 70 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 71 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 72 73 /* 74 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 75 * Look in process.c for details of kernel stack layout 76 */ 77 #define TSK_K_ESP(tsk) (tsk->thread.ksp) 78 79 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 80 sizeof(struct callee_regs) + off))) 81 82 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 83 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 84 85 extern void start_thread(struct pt_regs * regs, unsigned long pc, 86 unsigned long usp); 87 88 extern unsigned int get_wchan(struct task_struct *p); 89 90 #endif /* !__ASSEMBLY__ */ 91 92 /* 93 * Default System Memory Map on ARC 94 * 95 * ---------------------------- (lower 2G, Translated) ------------------------- 96 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 97 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 98 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 99 * 100 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 101 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 102 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 103 * ----------------------------------------------------------------------------- 104 */ 105 106 #define TASK_SIZE 0x60000000 107 108 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 109 110 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 111 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) 112 113 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 114 115 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 116 117 #ifdef CONFIG_ARC_PLAT_EZNPS 118 /* NPS architecture defines special window of 129M in user address space for 119 * special memory areas, when accessing this window the MMU do not use TLB. 120 * Instead MMU direct the access to: 121 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) 122 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) 123 * 124 * CMEM - is the fastest memory we got and its size is 16K. 125 * FMT - is used to map either to internal/external memory. 126 * Internal memory is the second fast memory and its size is 16M 127 * External memory is the biggest memory (16G) and also the slowest. 128 * 129 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. 130 */ 131 #define STACK_TOP 0x57e00000 132 #else 133 #define STACK_TOP TASK_SIZE 134 #endif 135 136 #define STACK_TOP_MAX STACK_TOP 137 138 /* This decides where the kernel will search for a free chunk of vm 139 * space during mmap's. 140 */ 141 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 142 143 #endif /* __ASM_ARC_PROCESSOR_H */ 144