| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2012 Regents of the University of California |
| */ |
| |
| #ifndef _ASM_RISCV_PROCESSOR_H |
| #define _ASM_RISCV_PROCESSOR_H |
| |
| #include <linux/const.h> |
| |
| #include <vdso/processor.h> |
| |
| #include <asm/ptrace.h> |
| |
| /* |
| * This decides where the kernel will search for a free chunk of vm |
| * space during mmap's. |
| */ |
| #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) |
| |
| #define STACK_TOP TASK_SIZE |
| #define STACK_TOP_MAX STACK_TOP |
| #define STACK_ALIGN 16 |
| |
| #ifndef __ASSEMBLY__ |
| |
| struct task_struct; |
| struct pt_regs; |
| |
| /* CPU-specific state of a task */ |
| struct thread_struct { |
| /* Callee-saved registers */ |
| unsigned long ra; |
| unsigned long sp; /* Kernel mode stack */ |
| unsigned long s[12]; /* s[0]: frame pointer */ |
| struct __riscv_d_ext_state fstate; |
| unsigned long bad_cause; |
| }; |
| |
| /* Whitelist the fstate from the task_struct for hardened usercopy */ |
| static inline void arch_thread_struct_whitelist(unsigned long *offset, |
| unsigned long *size) |
| { |
| *offset = offsetof(struct thread_struct, fstate); |
| *size = sizeof_field(struct thread_struct, fstate); |
| } |
| |
| #define INIT_THREAD { \ |
| .sp = sizeof(init_stack) + (long)&init_stack, \ |
| } |
| |
| #define task_pt_regs(tsk) \ |
| ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \ |
| - ALIGN(sizeof(struct pt_regs), STACK_ALIGN))) |
| |
| #define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc) |
| #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) |
| |
| |
| /* Do necessary setup to start up a newly executed thread. */ |
| extern void start_thread(struct pt_regs *regs, |
| unsigned long pc, unsigned long sp); |
| |
| /* Free all resources held by a thread. */ |
| static inline void release_thread(struct task_struct *dead_task) |
| { |
| } |
| |
| extern unsigned long __get_wchan(struct task_struct *p); |
| |
| |
| static inline void wait_for_interrupt(void) |
| { |
| __asm__ __volatile__ ("wfi"); |
| } |
| |
| struct device_node; |
| int riscv_of_processor_hartid(struct device_node *node); |
| int riscv_of_parent_hartid(struct device_node *node); |
| |
| extern void riscv_fill_hwcap(void); |
| extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* _ASM_RISCV_PROCESSOR_H */ |