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Diffstat (limited to 'arch/csky/include/asm/processor.h')
| -rw-r--r-- | arch/csky/include/asm/processor.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/csky/include/asm/processor.h b/arch/csky/include/asm/processor.h new file mode 100644 index 0000000000000..b1748659b2e95 --- /dev/null +++ b/arch/csky/include/asm/processor.h @@ -0,0 +1,115 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PROCESSOR_H +#define __ASM_CSKY_PROCESSOR_H + +#include <linux/bitops.h> +#include <asm/segment.h> +#include <asm/ptrace.h> +#include <asm/current.h> +#include <asm/cache.h> +#include <abi/reg_ops.h> +#include <abi/regdef.h> +#ifdef CONFIG_CPU_HAS_FPU +#include <abi/fpu.h> +#endif + +struct cpuinfo_csky { + unsigned long udelay_val; + unsigned long asid_cache; + /* + * Capability and feature descriptor structure for CSKY CPU + */ + unsigned long options; + unsigned int processor_id[4]; + unsigned int fpu_id; +} __aligned(SMP_CACHE_BYTES); + +extern struct cpuinfo_csky cpu_data[]; + +/* + * User space process size: 2GB. This is hardcoded into a few places, + * so don't change it unless you know what you are doing. TASK_SIZE + * for a 64 bit kernel expandable to 8192EB, of which the current CSKY + * implementations will "only" be able to use 1TB ... + */ +#define TASK_SIZE 0x7fff8000UL + +#ifdef __KERNEL__ +#define STACK_TOP TASK_SIZE +#define STACK_TOP_MAX STACK_TOP +#endif + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) + +struct thread_struct { + unsigned long ksp; /* kernel stack pointer */ + unsigned long sr; /* saved status register */ + unsigned long esp0; /* points to SR of stack frame */ + unsigned long hi; + unsigned long lo; + + /* Other stuff associated with the thread. */ + unsigned long address; /* Last user fault */ + unsigned long error_code; + + /* FPU regs */ + struct user_fp __aligned(16) user_fp; +}; + +#define INIT_THREAD { \ + .ksp = (unsigned long) init_thread_union.stack + THREAD_SIZE, \ + .sr = DEFAULT_PSR_VALUE, \ +} + +/* + * Do necessary setup to start up a newly executed thread. + * + * pass the data segment into user programs if it exists, + * it can't hurt anything as far as I can tell + */ +#define start_thread(_regs, _pc, _usp) \ +do { \ + set_fs(USER_DS); /* reads from user space */ \ + (_regs)->pc = (_pc); \ + (_regs)->regs[1] = 0; /* ABIV1 is R7, uClibc_main rtdl arg */ \ + (_regs)->regs[2] = 0; \ + (_regs)->regs[3] = 0; /* ABIV2 is R7, use it? */ \ + (_regs)->sr &= ~PS_S; \ + (_regs)->usp = (_usp); \ +} while (0) + +/* Forward declaration, a strange C thing */ +struct task_struct; + +/* Free all resources held by a thread. */ +static inline void release_thread(struct task_struct *dead_task) +{ +} + +/* Prepare to copy thread state - unlazy all lazy status */ +#define prepare_to_copy(tsk) do { } while (0) + +extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); + +#define copy_segments(tsk, mm) do { } while (0) +#define release_segments(mm) do { } while (0) +#define forget_segments() do { } while (0) + +extern unsigned long thread_saved_pc(struct task_struct *tsk); + +unsigned long get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) +#define KSTK_ESP(tsk) (task_pt_regs(tsk)->usp) + +#define task_pt_regs(p) \ + ((struct pt_regs *)(THREAD_SIZE + p->stack) - 1) + +#define cpu_relax() barrier() + +#endif /* __ASM_CSKY_PROCESSOR_H */ |