1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6 #ifndef _ASM_RISCV_PROCESSOR_H 7 #define _ASM_RISCV_PROCESSOR_H 8 9 #include <linux/const.h> 10 #include <linux/cache.h> 11 12 #include <vdso/processor.h> 13 14 #include <asm/ptrace.h> 15 16 #ifdef CONFIG_64BIT 17 #define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1)) 18 #define STACK_TOP_MAX TASK_SIZE_64 19 20 #define arch_get_mmap_end(addr, len, flags) \ 21 ({ \ 22 unsigned long mmap_end; \ 23 typeof(addr) _addr = (addr); \ 24 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ 25 mmap_end = STACK_TOP_MAX; \ 26 else if ((_addr) >= VA_USER_SV57) \ 27 mmap_end = STACK_TOP_MAX; \ 28 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ 29 mmap_end = VA_USER_SV48; \ 30 else \ 31 mmap_end = VA_USER_SV39; \ 32 mmap_end; \ 33 }) 34 35 #define arch_get_mmap_base(addr, base) \ 36 ({ \ 37 unsigned long mmap_base; \ 38 typeof(addr) _addr = (addr); \ 39 typeof(base) _base = (base); \ 40 unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \ 41 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ 42 mmap_base = (_base); \ 43 else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \ 44 mmap_base = VA_USER_SV57 - rnd_gap; \ 45 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ 46 mmap_base = VA_USER_SV48 - rnd_gap; \ 47 else \ 48 mmap_base = VA_USER_SV39 - rnd_gap; \ 49 mmap_base; \ 50 }) 51 52 #else 53 #define DEFAULT_MAP_WINDOW TASK_SIZE 54 #define STACK_TOP_MAX TASK_SIZE 55 #endif 56 #define STACK_ALIGN 16 57 58 #define STACK_TOP DEFAULT_MAP_WINDOW 59 60 /* 61 * This decides where the kernel will search for a free chunk of vm 62 * space during mmap's. 63 */ 64 #ifdef CONFIG_64BIT 65 #define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3) 66 #else 67 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 68 #endif 69 70 #ifndef __ASSEMBLY__ 71 72 struct task_struct; 73 struct pt_regs; 74 75 /* CPU-specific state of a task */ 76 struct thread_struct { 77 /* Callee-saved registers */ 78 unsigned long ra; 79 unsigned long sp; /* Kernel mode stack */ 80 unsigned long s[12]; /* s[0]: frame pointer */ 81 struct __riscv_d_ext_state fstate; 82 unsigned long bad_cause; 83 unsigned long vstate_ctrl; 84 struct __riscv_v_ext_state vstate; 85 }; 86 87 /* Whitelist the fstate from the task_struct for hardened usercopy */ 88 static inline void arch_thread_struct_whitelist(unsigned long *offset, 89 unsigned long *size) 90 { 91 *offset = offsetof(struct thread_struct, fstate); 92 *size = sizeof_field(struct thread_struct, fstate); 93 } 94 95 #define INIT_THREAD { \ 96 .sp = sizeof(init_stack) + (long)&init_stack, \ 97 } 98 99 #define task_pt_regs(tsk) \ 100 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \ 101 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN))) 102 103 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc) 104 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 105 106 107 /* Do necessary setup to start up a newly executed thread. */ 108 extern void start_thread(struct pt_regs *regs, 109 unsigned long pc, unsigned long sp); 110 111 extern unsigned long __get_wchan(struct task_struct *p); 112 113 114 static inline void wait_for_interrupt(void) 115 { 116 __asm__ __volatile__ ("wfi"); 117 } 118 119 struct device_node; 120 int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid); 121 int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid); 122 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid); 123 124 extern void riscv_fill_hwcap(void); 125 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 126 127 extern unsigned long signal_minsigstksz __ro_after_init; 128 129 #ifdef CONFIG_RISCV_ISA_V 130 /* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */ 131 #define RISCV_V_SET_CONTROL(arg) riscv_v_vstate_ctrl_set_current(arg) 132 #define RISCV_V_GET_CONTROL() riscv_v_vstate_ctrl_get_current() 133 extern long riscv_v_vstate_ctrl_set_current(unsigned long arg); 134 extern long riscv_v_vstate_ctrl_get_current(void); 135 #endif /* CONFIG_RISCV_ISA_V */ 136 137 #endif /* __ASSEMBLY__ */ 138 139 #endif /* _ASM_RISCV_PROCESSOR_H */ 140