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)
24 #define KERNEL_DS UL(-1)
25 #define USER_DS (TASK_SIZE_64 - 1)
30 * Default implementation of macro that returns current
31 * instruction pointer ("program counter").
33 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
37 #include <linux/string.h>
39 #include <asm/alternative.h>
40 #include <asm/cpufeature.h>
41 #include <asm/fpsimd.h>
42 #include <asm/hw_breakpoint.h>
44 #include <asm/pgtable-hwdef.h>
45 #include <asm/ptrace.h>
46 #include <asm/types.h>
49 * TASK_SIZE - the maximum size of a user space task.
50 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
53 #ifdef CONFIG_ARM64_64K_PAGES
55 * With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied
56 * by the compat vectors page.
58 #define TASK_SIZE_32 UL(0x100000000)
60 #define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE)
61 #endif /* CONFIG_ARM64_64K_PAGES */
62 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
63 TASK_SIZE_32 : TASK_SIZE_64)
64 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
65 TASK_SIZE_32 : TASK_SIZE_64)
67 #define TASK_SIZE TASK_SIZE_64
68 #endif /* CONFIG_COMPAT */
70 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
72 #define STACK_TOP_MAX TASK_SIZE_64
74 #define AARCH32_VECTORS_BASE 0xffff0000
75 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
76 AARCH32_VECTORS_BASE : STACK_TOP_MAX)
78 #define STACK_TOP STACK_TOP_MAX
79 #endif /* CONFIG_COMPAT */
81 extern phys_addr_t arm64_dma_phys_limit;
82 #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
85 /* Have we suspended stepping by a debugger? */
87 /* Allow breakpoints and watchpoints to be disabled for this thread. */
90 /* Hardware breakpoints pinned to this task. */
91 struct perf_event *hbp_break[ARM_MAX_BRP];
92 struct perf_event *hbp_watch[ARM_MAX_WRP];
111 struct thread_struct {
112 struct cpu_context cpu_context; /* cpu context */
113 unsigned long tp_value; /* TLS register */
115 unsigned long tp2_value;
117 struct fpsimd_state fpsimd_state;
118 unsigned long fault_address; /* fault info */
119 unsigned long fault_code; /* ESR_EL1 value */
120 struct debug_info debug; /* debugging */
124 #define task_user_tls(t) \
126 unsigned long *__tls; \
127 if (is_compat_thread(task_thread_info(t))) \
128 __tls = &(t)->thread.tp2_value; \
130 __tls = &(t)->thread.tp_value; \
134 #define task_user_tls(t) (&(t)->thread.tp_value)
137 #define INIT_THREAD { }
139 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
141 memset(regs, 0, sizeof(*regs));
142 regs->syscallno = ~0UL;
146 static inline void start_thread(struct pt_regs *regs, unsigned long pc,
149 start_thread_common(regs, pc);
150 regs->pstate = PSR_MODE_EL0t;
155 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
158 start_thread_common(regs, pc);
159 regs->pstate = COMPAT_PSR_MODE_USR;
161 regs->pstate |= COMPAT_PSR_T_BIT;
164 regs->pstate |= COMPAT_PSR_E_BIT;
167 regs->compat_sp = sp;
171 /* Forward declaration, a strange C thing */
174 /* Free all resources held by a thread. */
175 extern void release_thread(struct task_struct *);
177 unsigned long get_wchan(struct task_struct *p);
179 static inline void cpu_relax(void)
181 asm volatile("yield" ::: "memory");
184 #define cpu_relax_lowlatency() cpu_relax()
186 /* Thread switching */
187 extern struct task_struct *cpu_switch_to(struct task_struct *prev,
188 struct task_struct *next);
190 #define task_pt_regs(p) \
191 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
193 #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
194 #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
197 * Prefetching support
199 #define ARCH_HAS_PREFETCH
200 static inline void prefetch(const void *ptr)
202 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
205 #define ARCH_HAS_PREFETCHW
206 static inline void prefetchw(const void *ptr)
208 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
211 #define ARCH_HAS_SPINLOCK_PREFETCH
212 static inline void spin_lock_prefetch(const void *ptr)
214 asm volatile(ARM64_LSE_ATOMIC_INSN(
215 "prfm pstl1strm, %a0",
216 "nop") : : "p" (ptr));
219 #define HAVE_ARCH_PICK_MMAP_LAYOUT
223 void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused);
224 void cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused);
226 #endif /* __ASSEMBLY__ */
227 #endif /* __ASM_PROCESSOR_H */