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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __ASM_CSKY_PROCESSOR_H
- #define __ASM_CSKY_PROCESSOR_H
- #include <linux/bitops.h>
- #include <linux/cache.h>
- #include <asm/ptrace.h>
- #include <asm/current.h>
- #include <abi/reg_ops.h>
- #include <abi/regdef.h>
- #include <abi/switch_context.h>
- #ifdef CONFIG_CPU_HAS_FPU
- #include <abi/fpu.h>
- #endif
- struct cpuinfo_csky {
- unsigned long asid_cache;
- } __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 (PAGE_OFFSET - (PAGE_SIZE * 8))
- #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 sp; /* kernel stack pointer */
- unsigned long trap_no; /* saved status register */
- /* FPU regs */
- struct user_fp __aligned(16) user_fp;
- };
- #define INIT_THREAD { \
- .sp = sizeof(init_stack) + (unsigned long) &init_stack, \
- }
- /*
- * 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 { \
- (_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;
- /* 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);
- 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 + task_stack_page(p)) - 1)
- #define cpu_relax() barrier()
- #endif /* __ASM_CSKY_PROCESSOR_H */
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