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 18 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 19 /* These DPFP regs need to be saved/restored across ctx-sw */ 20 struct arc_fpu { 21 struct { 22 unsigned int l, h; 23 } aux_dpfp[2]; 24 }; 25 #endif 26 27 #ifdef CONFIG_ARC_PLAT_EZNPS 28 struct eznps_dp { 29 unsigned int eflags; 30 unsigned int gpa1; 31 }; 32 #endif 33 34 /* Arch specific stuff which needs to be saved per task. 35 * However these items are not so important so as to earn a place in 36 * struct thread_info 37 */ 38 struct thread_struct { 39 unsigned long ksp; /* kernel mode stack pointer */ 40 unsigned long callee_reg; /* pointer to callee regs */ 41 unsigned long fault_address; /* dbls as brkpt holder as well */ 42 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 43 struct arc_fpu fpu; 44 #endif 45 #ifdef CONFIG_ARC_PLAT_EZNPS 46 struct eznps_dp dp; 47 #endif 48 }; 49 50 #define INIT_THREAD { \ 51 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 52 } 53 54 /* Forward declaration, a strange C thing */ 55 struct task_struct; 56 57 #define task_pt_regs(p) \ 58 ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) 59 60 /* Free all resources held by a thread */ 61 #define release_thread(thread) do { } while (0) 62 63 /* 64 * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise 65 * get optimised away by gcc 66 */ 67 #ifndef CONFIG_EZNPS_MTM_EXT 68 69 #define cpu_relax() barrier() 70 71 #else 72 73 #define cpu_relax() \ 74 __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") 75 76 #endif 77 78 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) 79 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 80 81 /* 82 * Where about of Task's sp, fp, blink when it was last seen in kernel mode. 83 * Look in process.c for details of kernel stack layout 84 */ 85 #define TSK_K_ESP(tsk) (tsk->thread.ksp) 86 87 #define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ 88 sizeof(struct callee_regs) + off))) 89 90 #define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) 91 #define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) 92 93 extern void start_thread(struct pt_regs * regs, unsigned long pc, 94 unsigned long usp); 95 96 extern unsigned int get_wchan(struct task_struct *p); 97 98 #endif /* !__ASSEMBLY__ */ 99 100 /* 101 * Default System Memory Map on ARC 102 * 103 * ---------------------------- (lower 2G, Translated) ------------------------- 104 * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) 105 * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) 106 * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) 107 * 108 * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- 109 * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) 110 * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) 111 * ----------------------------------------------------------------------------- 112 */ 113 114 #define TASK_SIZE 0x60000000 115 116 #define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) 117 118 /* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ 119 #define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) 120 121 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 122 123 #define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) 124 125 #ifdef CONFIG_ARC_PLAT_EZNPS 126 /* NPS architecture defines special window of 129M in user address space for 127 * special memory areas, when accessing this window the MMU do not use TLB. 128 * Instead MMU direct the access to: 129 * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) 130 * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) 131 * 132 * CMEM - is the fastest memory we got and its size is 16K. 133 * FMT - is used to map either to internal/external memory. 134 * Internal memory is the second fast memory and its size is 16M 135 * External memory is the biggest memory (16G) and also the slowest. 136 * 137 * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. 138 */ 139 #define STACK_TOP 0x57e00000 140 #else 141 #define STACK_TOP TASK_SIZE 142 #endif 143 144 #define STACK_TOP_MAX STACK_TOP 145 146 /* This decides where the kernel will search for a free chunk of vm 147 * space during mmap's. 148 */ 149 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 150 151 #endif /* __ASM_ARC_PROCESSOR_H */ 152