linux_dsm_epyc7002/arch/nds32/include/asm/processor.h
Vincent Chen e46bf83c18 nds32: nds32 FPU port
This patch set contains basic components for supporting the nds32 FPU,
such as exception handlers and context switch for FPU registers. By
default, the lazy FPU scheme is supported and the user can configure it via
CONFIG_LZAY_FPU.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
2018-11-22 18:13:13 +08:00

105 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#ifndef __ASM_NDS32_PROCESSOR_H
#define __ASM_NDS32_PROCESSOR_H
#ifdef __KERNEL__
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/sigcontext.h>
#define KERNEL_STACK_SIZE PAGE_SIZE
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE
struct cpu_context {
unsigned long r6;
unsigned long r7;
unsigned long r8;
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long fp;
unsigned long pc;
unsigned long sp;
};
struct thread_struct {
struct cpu_context cpu_context; /* cpu context */
/* fault info */
unsigned long address;
unsigned long trap_no;
unsigned long error_code;
struct fpu_struct fpu;
};
#define INIT_THREAD { }
#ifdef __NDS32_EB__
#define PSW_DE PSW_mskBE
#else
#define PSW_DE 0x0
#endif
#ifdef CONFIG_WBNA
#define PSW_valWBNA PSW_mskWBNA
#else
#define PSW_valWBNA 0x0
#endif
#ifdef CONFIG_HWZOL
#define PSW_valINIT (PSW_CPL_ANY | PSW_mskAEN | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
#else
#define PSW_valINIT (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
#endif
#define start_thread(regs,pc,stack) \
({ \
memzero(regs, sizeof(struct pt_regs)); \
forget_syscall(regs); \
regs->ipsw = PSW_valINIT; \
regs->ir0 = (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_SYSTEM | PSW_INTL_1); \
regs->ipc = pc; \
regs->sp = stack; \
})
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
#if IS_ENABLED(CONFIG_FPU)
#if !IS_ENABLED(CONFIG_UNLAZU_FPU)
extern struct task_struct *last_task_used_math;
#endif
#endif
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
#define task_pt_regs(task) \
((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE \
- 8) - 1)
/*
* Create a new kernel thread
*/
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
#define KSTK_EIP(tsk) instruction_pointer(task_pt_regs(tsk))
#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
#endif
#endif /* __ASM_NDS32_PROCESSOR_H */