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