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94 lines
2.5 KiB
94 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_CSKY_PROCESSOR_H |
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#define __ASM_CSKY_PROCESSOR_H |
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#include <linux/bitops.h> |
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#include <asm/segment.h> |
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#include <asm/ptrace.h> |
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#include <asm/current.h> |
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#include <asm/cache.h> |
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#include <abi/reg_ops.h> |
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#include <abi/regdef.h> |
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#include <abi/switch_context.h> |
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#ifdef CONFIG_CPU_HAS_FPU |
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#include <abi/fpu.h> |
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#endif |
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struct cpuinfo_csky { |
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unsigned long asid_cache; |
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} __aligned(SMP_CACHE_BYTES); |
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extern struct cpuinfo_csky cpu_data[]; |
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/* |
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* User space process size: 2GB. This is hardcoded into a few places, |
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* so don't change it unless you know what you are doing. TASK_SIZE |
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* for a 64 bit kernel expandable to 8192EB, of which the current CSKY |
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* implementations will "only" be able to use 1TB ... |
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*/ |
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#define TASK_SIZE (PAGE_OFFSET - (PAGE_SIZE * 8)) |
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#ifdef __KERNEL__ |
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#define STACK_TOP TASK_SIZE |
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#define STACK_TOP_MAX STACK_TOP |
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#endif |
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/* This decides where the kernel will search for a free chunk of vm |
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* space during mmap's. |
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*/ |
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) |
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struct thread_struct { |
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unsigned long sp; /* kernel stack pointer */ |
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unsigned long trap_no; /* saved status register */ |
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/* FPU regs */ |
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struct user_fp __aligned(16) user_fp; |
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}; |
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#define INIT_THREAD { \ |
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.sp = sizeof(init_stack) + (unsigned long) &init_stack, \ |
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} |
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/* |
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* Do necessary setup to start up a newly executed thread. |
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* |
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* pass the data segment into user programs if it exists, |
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* it can't hurt anything as far as I can tell |
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*/ |
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#define start_thread(_regs, _pc, _usp) \ |
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do { \ |
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set_fs(USER_DS); /* reads from user space */ \ |
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(_regs)->pc = (_pc); \ |
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(_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ |
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(_regs)->regs[2] = 0; \ |
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(_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ |
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(_regs)->sr &= ~PS_S; \ |
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(_regs)->usp = (_usp); \ |
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} while (0) |
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/* Forward declaration, a strange C thing */ |
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struct task_struct; |
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/* Free all resources held by a thread. */ |
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static inline void release_thread(struct task_struct *dead_task) |
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{ |
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} |
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/* Prepare to copy thread state - unlazy all lazy status */ |
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#define prepare_to_copy(tsk) do { } while (0) |
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
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unsigned long get_wchan(struct task_struct *p); |
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) |
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#define task_pt_regs(p) \ |
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((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) |
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#define cpu_relax() barrier() |
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#endif /* __ASM_CSKY_PROCESSOR_H */
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