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 11 #include <vdso/processor.h> 12 13 #include <asm/ptrace.h> 14 15 /* 16 * This decides where the kernel will search for a free chunk of vm 17 * space during mmap's. 18 */ 19 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 20 21 #define STACK_TOP TASK_SIZE 22 #ifdef CONFIG_64BIT 23 #define STACK_TOP_MAX TASK_SIZE_64 24 #else 25 #define STACK_TOP_MAX TASK_SIZE 26 #endif 27 #define STACK_ALIGN 16 28 29 #ifndef __ASSEMBLY__ 30 31 struct task_struct; 32 struct pt_regs; 33 34 /* CPU-specific state of a task */ 35 struct thread_struct { 36 /* Callee-saved registers */ 37 unsigned long ra; 38 unsigned long sp; /* Kernel mode stack */ 39 unsigned long s[12]; /* s[0]: frame pointer */ 40 struct __riscv_d_ext_state fstate; 41 unsigned long bad_cause; 42 }; 43 44 /* Whitelist the fstate from the task_struct for hardened usercopy */ 45 static inline void arch_thread_struct_whitelist(unsigned long *offset, 46 unsigned long *size) 47 { 48 *offset = offsetof(struct thread_struct, fstate); 49 *size = sizeof_field(struct thread_struct, fstate); 50 } 51 52 #define INIT_THREAD { \ 53 .sp = sizeof(init_stack) + (long)&init_stack, \ 54 } 55 56 #define task_pt_regs(tsk) \ 57 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \ 58 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN))) 59 60 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc) 61 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 62 63 64 /* Do necessary setup to start up a newly executed thread. */ 65 extern void start_thread(struct pt_regs *regs, 66 unsigned long pc, unsigned long sp); 67 68 /* Free all resources held by a thread. */ 69 static inline void release_thread(struct task_struct *dead_task) 70 { 71 } 72 73 extern unsigned long __get_wchan(struct task_struct *p); 74 75 76 static inline void wait_for_interrupt(void) 77 { 78 __asm__ __volatile__ ("wfi"); 79 } 80 81 struct device_node; 82 int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid); 83 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid); 84 85 extern void riscv_fill_hwcap(void); 86 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 87 88 #endif /* __ASSEMBLY__ */ 89 90 #endif /* _ASM_RISCV_PROCESSOR_H */ 91