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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H
#include <linux/atomic.h>
#include <linux/cpumask.h>
#include <linux/sizes.h>
#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/loongarch.h>
#include <asm/vdso/processor.h>
#include <uapi/asm/ptrace.h>
#include <uapi/asm/sigcontext.h>
#ifdef CONFIG_32BIT
#define TASK_SIZE 0x80000000UL
#define TASK_SIZE_MIN TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE
#define TASK_IS_32BIT_ADDR 1
#endif
#ifdef CONFIG_64BIT
#define TASK_SIZE32 0x100000000UL
#define TASK_SIZE64 (0x1UL << ((cpu_vabits > VA_BITS) ? VA_BITS : cpu_vabits))
#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
#define TASK_SIZE_MIN TASK_SIZE32
#define STACK_TOP_MAX TASK_SIZE64
#define TASK_SIZE_OF(tsk) \
(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
#endif
#define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)
unsigned long stack_top(void);
#define STACK_TOP stack_top()
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
#define FPU_REG_WIDTH 256
#define FPU_ALIGN __attribute__((aligned(32)))
union fpureg {
__u32 val32[FPU_REG_WIDTH / 32];
__u64 val64[FPU_REG_WIDTH / 64];
};
#define FPR_IDX(width, idx) (idx)
#define BUILD_FPR_ACCESS(width) \
static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx) \
{ \
return fpr->val##width[FPR_IDX(width, idx)]; \
} \
\
static inline void set_fpr##width(union fpureg *fpr, unsigned int idx, \
u##width val) \
{ \
fpr->val##width[FPR_IDX(width, idx)] = val; \
}
BUILD_FPR_ACCESS(32)
BUILD_FPR_ACCESS(64)
struct loongarch_fpu {
unsigned int fcsr;
uint64_t fcc; /* 8x8 */
union fpureg fpr[NUM_FPU_REGS];
};
#define INIT_CPUMASK { \
{0,} \
}
#define ARCH_MIN_TASKALIGN 32
struct loongarch_vdso_info;
/*
* If you change thread_struct remember to change the #defines below too!
*/
struct thread_struct {
/* Main processor registers. */
unsigned long reg01, reg03, reg22; /* ra sp fp */
unsigned long reg23, reg24, reg25, reg26; /* s0-s3 */
unsigned long reg27, reg28, reg29, reg30, reg31; /* s4-s8 */
/* __schedule() return address / call frame address */
unsigned long sched_ra;
unsigned long sched_cfa;
/* CSR registers */
unsigned long csr_prmd;
unsigned long csr_crmd;
unsigned long csr_euen;
unsigned long csr_ecfg;
unsigned long csr_badvaddr; /* Last user fault */
/* Scratch registers */
unsigned long scr0;
unsigned long scr1;
unsigned long scr2;
unsigned long scr3;
/* Eflags register */
unsigned long eflags;
/* Other stuff associated with the thread. */
unsigned long trap_nr;
unsigned long error_code;
struct loongarch_vdso_info *vdso;
/*
* FPU & vector registers, must be at last because
* they are conditionally copied at fork().
*/
struct loongarch_fpu fpu FPU_ALIGN;
};
#define thread_saved_ra(tsk) (tsk->thread.sched_ra)
#define thread_saved_fp(tsk) (tsk->thread.sched_cfa)
#define INIT_THREAD { \
/* \
* Main processor registers \
*/ \
.reg01 = 0, \
.reg03 = 0, \
.reg22 = 0, \
.reg23 = 0, \
.reg24 = 0, \
.reg25 = 0, \
.reg26 = 0, \
.reg27 = 0, \
.reg28 = 0, \
.reg29 = 0, \
.reg30 = 0, \
.reg31 = 0, \
.sched_ra = 0, \
.sched_cfa = 0, \
.csr_crmd = 0, \
.csr_prmd = 0, \
.csr_euen = 0, \
.csr_ecfg = 0, \
.csr_badvaddr = 0, \
/* \
* Other stuff associated with the process \
*/ \
.trap_nr = 0, \
.error_code = 0, \
/* \
* FPU & vector registers \
*/ \
.fpu = { \
.fcsr = 0, \
.fcc = 0, \
.fpr = {{{0,},},}, \
}, \
}
struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while (0)
enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT, IDLE_POLL};
extern unsigned long boot_option_idle_override;
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp);
static inline void flush_thread(void)
{
}
unsigned long __get_wchan(struct task_struct *p);
#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
THREAD_SIZE - 32 - sizeof(struct pt_regs))
#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->csr_era)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[3])
#define KSTK_EUEN(tsk) (task_pt_regs(tsk)->csr_euen)
#define KSTK_ECFG(tsk) (task_pt_regs(tsk)->csr_ecfg)
#define return_address() ({__asm__ __volatile__("":::"$1"); __builtin_return_address(0);})
#ifdef CONFIG_CPU_HAS_PREFETCH
#define ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch((x), 0, 1)
#define ARCH_HAS_PREFETCHW
#define prefetchw(x) __builtin_prefetch((x), 1, 1)
#endif
#endif /* _ASM_PROCESSOR_H */
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