2 * Based on arch/arm/include/asm/processor.h
4 * Copyright (C) 1995-1999 Russell King
5 * Copyright (C) 2012 ARM Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #ifndef __ASM_PROCESSOR_H
20 #define __ASM_PROCESSOR_H
22 #define TASK_SIZE_64 (UL(1) << VA_BITS)
27 * Default implementation of macro that returns current
28 * instruction pointer ("program counter").
30 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
34 #include <linux/string.h>
36 #include <asm/alternative.h>
37 #include <asm/fpsimd.h>
38 #include <asm/hw_breakpoint.h>
40 #include <asm/pgtable-hwdef.h>
41 #include <asm/ptrace.h>
42 #include <asm/types.h>
45 * TASK_SIZE - the maximum size of a user space task.
46 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
49 #define TASK_SIZE_32 UL(0x100000000)
50 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
51 TASK_SIZE_32 : TASK_SIZE_64)
52 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
53 TASK_SIZE_32 : TASK_SIZE_64)
55 #define TASK_SIZE TASK_SIZE_64
56 #endif /* CONFIG_COMPAT */
58 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
60 #define STACK_TOP_MAX TASK_SIZE_64
62 #define AARCH32_VECTORS_BASE 0xffff0000
63 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
64 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
66 #define STACK_TOP STACK_TOP_MAX
67 #endif /* CONFIG_COMPAT */
69 extern phys_addr_t arm64_dma_phys_limit;
70 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
73 #ifdef CONFIG_HAVE_HW_BREAKPOINT
74 /* Have we suspended stepping by a debugger? */
76 /* Allow breakpoints and watchpoints to be disabled for this thread. */
79 /* Hardware breakpoints pinned to this task. */
80 struct perf_event *hbp_break[ARM_MAX_BRP];
81 struct perf_event *hbp_watch[ARM_MAX_WRP];
101 struct thread_struct {
102 struct cpu_context cpu_context; /* cpu context */
103 unsigned long tp_value; /* TLS register */
105 unsigned long tp2_value;
107 struct fpsimd_state fpsimd_state;
108 unsigned long fault_address; /* fault info */
109 unsigned long fault_code; /* ESR_EL1 value */
110 struct debug_info debug; /* debugging */
114 #define task_user_tls(t) \
116 unsigned long *__tls; \
117 if (is_compat_thread(task_thread_info(t))) \
118 __tls = &(t)->thread.tp2_value; \
120 __tls = &(t)->thread.tp_value; \
124 #define task_user_tls(t) (&(t)->thread.tp_value)
127 /* Sync TPIDR_EL0 back to thread_struct for current */
128 void tls_preserve_current_state(void);
130 #define INIT_THREAD { }
132 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
134 memset(regs, 0, sizeof(*regs));
135 forget_syscall(regs);
139 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
142 start_thread_common(regs, pc);
143 regs->pstate = PSR_MODE_EL0t;
148 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
151 start_thread_common(regs, pc);
152 regs->pstate = COMPAT_PSR_MODE_USR;
154 regs->pstate |= COMPAT_PSR_T_BIT;
157 regs->pstate |= COMPAT_PSR_E_BIT;
160 regs->compat_sp = sp;
164 /* Forward declaration, a strange C thing */
167 /* Free all resources held by a thread. */
168 extern void release_thread(struct task_struct *);
170 unsigned long get_wchan(struct task_struct *p);
172 static inline void cpu_relax(void)
174 asm volatile("yield" ::: "memory");
177 /* Thread switching */
178 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
179 struct task_struct *next);
181 #define task_pt_regs(p) \
182 ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
184 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
185 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
188 * Prefetching support
190 #define ARCH_HAS_PREFETCH
191 static inline void prefetch(const void *ptr)
193 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
196 #define ARCH_HAS_PREFETCHW
197 static inline void prefetchw(const void *ptr)
199 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
202 #define ARCH_HAS_SPINLOCK_PREFETCH
203 static inline void spin_lock_prefetch(const void *ptr)
205 asm volatile(ARM64_LSE_ATOMIC_INSN(
206 "prfm pstl1strm, %a0",
207 "nop") : : "p" (ptr));
210 #define HAVE_ARCH_PICK_MMAP_LAYOUT
214 int cpu_enable_pan(void *__unused);
215 int cpu_enable_cache_maint_trap(void *__unused);
217 #endif /* __ASSEMBLY__ */
218 #endif /* __ASM_PROCESSOR_H */