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 #include <linux/prctl.h> 12 13 #include <vdso/processor.h> 14 15 #include <asm/ptrace.h> 16 17 #ifdef CONFIG_64BIT 18 #define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1)) 19 #define STACK_TOP_MAX TASK_SIZE_64 20 21 #define arch_get_mmap_end(addr, len, flags) \ 22 ({ \ 23 unsigned long mmap_end; \ 24 typeof(addr) _addr = (addr); \ 25 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ 26 mmap_end = STACK_TOP_MAX; \ 27 else if ((_addr) >= VA_USER_SV57) \ 28 mmap_end = STACK_TOP_MAX; \ 29 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ 30 mmap_end = VA_USER_SV48; \ 31 else \ 32 mmap_end = VA_USER_SV39; \ 33 mmap_end; \ 34 }) 35 36 #define arch_get_mmap_base(addr, base) \ 37 ({ \ 38 unsigned long mmap_base; \ 39 typeof(addr) _addr = (addr); \ 40 typeof(base) _base = (base); \ 41 unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \ 42 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ 43 mmap_base = (_base); \ 44 else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \ 45 mmap_base = VA_USER_SV57 - rnd_gap; \ 46 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ 47 mmap_base = VA_USER_SV48 - rnd_gap; \ 48 else \ 49 mmap_base = VA_USER_SV39 - rnd_gap; \ 50 mmap_base; \ 51 }) 52 53 #else 54 #define DEFAULT_MAP_WINDOW TASK_SIZE 55 #define STACK_TOP_MAX TASK_SIZE 56 #endif 57 #define STACK_ALIGN 16 58 59 #define STACK_TOP DEFAULT_MAP_WINDOW 60 61 /* 62 * This decides where the kernel will search for a free chunk of vm 63 * space during mmap's. 64 */ 65 #ifdef CONFIG_64BIT 66 #define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3) 67 #else 68 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 69 #endif 70 71 #ifndef __ASSEMBLY__ 72 73 struct task_struct; 74 struct pt_regs; 75 76 /* 77 * We use a flag to track in-kernel Vector context. Currently the flag has the 78 * following meaning: 79 * 80 * - bit 0: indicates whether the in-kernel Vector context is active. The 81 * activation of this state disables the preemption. 82 */ 83 #define RISCV_KERNEL_MODE_V 0x1 84 85 /* CPU-specific state of a task */ 86 struct thread_struct { 87 /* Callee-saved registers */ 88 unsigned long ra; 89 unsigned long sp; /* Kernel mode stack */ 90 unsigned long s[12]; /* s[0]: frame pointer */ 91 struct __riscv_d_ext_state fstate; 92 unsigned long bad_cause; 93 u32 riscv_v_flags; 94 u32 vstate_ctrl; 95 struct __riscv_v_ext_state vstate; 96 unsigned long align_ctl; 97 }; 98 99 /* Whitelist the fstate from the task_struct for hardened usercopy */ 100 static inline void arch_thread_struct_whitelist(unsigned long *offset, 101 unsigned long *size) 102 { 103 *offset = offsetof(struct thread_struct, fstate); 104 *size = sizeof_field(struct thread_struct, fstate); 105 } 106 107 #define INIT_THREAD { \ 108 .sp = sizeof(init_stack) + (long)&init_stack, \ 109 .align_ctl = PR_UNALIGN_NOPRINT, \ 110 } 111 112 #define task_pt_regs(tsk) \ 113 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \ 114 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN))) 115 116 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc) 117 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 118 119 120 /* Do necessary setup to start up a newly executed thread. */ 121 extern void start_thread(struct pt_regs *regs, 122 unsigned long pc, unsigned long sp); 123 124 extern unsigned long __get_wchan(struct task_struct *p); 125 126 127 static inline void wait_for_interrupt(void) 128 { 129 __asm__ __volatile__ ("wfi"); 130 } 131 132 extern phys_addr_t dma32_phys_limit; 133 134 struct device_node; 135 int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid); 136 int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid); 137 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid); 138 139 extern void riscv_fill_hwcap(void); 140 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 141 142 extern unsigned long signal_minsigstksz __ro_after_init; 143 144 #ifdef CONFIG_RISCV_ISA_V 145 /* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */ 146 #define RISCV_V_SET_CONTROL(arg) riscv_v_vstate_ctrl_set_current(arg) 147 #define RISCV_V_GET_CONTROL() riscv_v_vstate_ctrl_get_current() 148 extern long riscv_v_vstate_ctrl_set_current(unsigned long arg); 149 extern long riscv_v_vstate_ctrl_get_current(void); 150 #endif /* CONFIG_RISCV_ISA_V */ 151 152 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long addr); 153 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 154 155 #define GET_UNALIGN_CTL(tsk, addr) get_unalign_ctl((tsk), (addr)) 156 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 157 158 #endif /* __ASSEMBLY__ */ 159 160 #endif /* _ASM_RISCV_PROCESSOR_H */ 161