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LoongArch: Add exception/interrupt handling

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Add the exception and interrupt handling machanism for basic LoongArch
support.

Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2022-05-31 18:04:11 +08:00
parent 628c3bb40e
commit 0603839b18
16 changed files with 1575 additions and 0 deletions
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21
arch/loongarch/include/asm/branch.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_BRANCH_H
#define _ASM_BRANCH_H
#include <asm/ptrace.h>
static inline unsigned long exception_era(struct pt_regs *regs)
{
return regs->csr_era;
}
static inline int compute_return_era(struct pt_regs *regs)
{
regs->csr_era += 4;
return 0;
}
#endif /* _ASM_BRANCH_H */

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arch/loongarch/include/asm/bug.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_BUG_H
#define __ASM_BUG_H
#include <linux/compiler.h>
#ifdef CONFIG_BUG
#include <asm/break.h>
static inline void __noreturn BUG(void)
{
__asm__ __volatile__("break %0" : : "i" (BRK_BUG));
unreachable();
}
#define HAVE_ARCH_BUG
#endif
#include <asm-generic/bug.h>
#endif /* __ASM_BUG_H */

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arch/loongarch/include/asm/entry-common.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ARCH_LOONGARCH_ENTRY_COMMON_H
#define ARCH_LOONGARCH_ENTRY_COMMON_H
#include <linux/sched.h>
#include <linux/processor.h>
static inline bool on_thread_stack(void)
{
return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
}
#endif

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arch/loongarch/include/asm/hardirq.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_HARDIRQ_H
#define _ASM_HARDIRQ_H
#include <linux/cache.h>
#include <linux/threads.h>
#include <linux/irq.h>
extern void ack_bad_irq(unsigned int irq);
#define ack_bad_irq ack_bad_irq
#define NR_IPI 2
typedef struct {
unsigned int ipi_irqs[NR_IPI];
unsigned int __softirq_pending;
} ____cacheline_aligned irq_cpustat_t;
DECLARE_PER_CPU_ALIGNED(irq_cpustat_t, irq_stat);
#endif /* _ASM_HARDIRQ_H */

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arch/loongarch/include/asm/hw_irq.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef __ASM_HW_IRQ_H
#define __ASM_HW_IRQ_H
#include <linux/atomic.h>
extern atomic_t irq_err_count;
/*
* interrupt-retrigger: NOP for now. This may not be appropriate for all
* machines, we'll see ...
*/
#endif /* __ASM_HW_IRQ_H */

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arch/loongarch/include/asm/irq.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_IRQ_H
#define _ASM_IRQ_H
#include <linux/irqdomain.h>
#include <linux/irqreturn.h>
#define IRQ_STACK_SIZE THREAD_SIZE
#define IRQ_STACK_START (IRQ_STACK_SIZE - 16)
DECLARE_PER_CPU(unsigned long, irq_stack);
/*
* The highest address on the IRQ stack contains a dummy frame which is
* structured as follows:
*
* top ------------
* | task sp | <- irq_stack[cpu] + IRQ_STACK_START
* ------------
* | | <- First frame of IRQ context
* ------------
*
* task sp holds a copy of the task stack pointer where the struct pt_regs
* from exception entry can be found.
*/
static inline bool on_irq_stack(int cpu, unsigned long sp)
{
unsigned long low = per_cpu(irq_stack, cpu);
unsigned long high = low + IRQ_STACK_SIZE;
return (low <= sp && sp <= high);
}
int get_ipi_irq(void);
int get_pmc_irq(void);
int get_timer_irq(void);
void spurious_interrupt(void);
#define NR_IRQS_LEGACY 16
#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
void arch_trigger_cpumask_backtrace(const struct cpumask *mask, bool exclude_self);
#define MAX_IO_PICS 2
#define NR_IRQS (64 + (256 * MAX_IO_PICS))
#define CORES_PER_EIO_NODE 4
#define LOONGSON_CPU_UART0_VEC 10 /* CPU UART0 */
#define LOONGSON_CPU_THSENS_VEC 14 /* CPU Thsens */
#define LOONGSON_CPU_HT0_VEC 16 /* CPU HT0 irq vector base number */
#define LOONGSON_CPU_HT1_VEC 24 /* CPU HT1 irq vector base number */
/* IRQ number definitions */
#define LOONGSON_LPC_IRQ_BASE 0
#define LOONGSON_LPC_LAST_IRQ (LOONGSON_LPC_IRQ_BASE + 15)
#define LOONGSON_CPU_IRQ_BASE 16
#define LOONGSON_CPU_LAST_IRQ (LOONGSON_CPU_IRQ_BASE + 14)
#define LOONGSON_PCH_IRQ_BASE 64
#define LOONGSON_PCH_ACPI_IRQ (LOONGSON_PCH_IRQ_BASE + 47)
#define LOONGSON_PCH_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 64 - 1)
#define LOONGSON_MSI_IRQ_BASE (LOONGSON_PCH_IRQ_BASE + 64)
#define LOONGSON_MSI_LAST_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1)
#define GSI_MIN_LPC_IRQ LOONGSON_LPC_IRQ_BASE
#define GSI_MAX_LPC_IRQ (LOONGSON_LPC_IRQ_BASE + 16 - 1)
#define GSI_MIN_CPU_IRQ LOONGSON_CPU_IRQ_BASE
#define GSI_MAX_CPU_IRQ (LOONGSON_CPU_IRQ_BASE + 48 - 1)
#define GSI_MIN_PCH_IRQ LOONGSON_PCH_IRQ_BASE
#define GSI_MAX_PCH_IRQ (LOONGSON_PCH_IRQ_BASE + 256 - 1)
extern int find_pch_pic(u32 gsi);
extern int eiointc_get_node(int id);
static inline void eiointc_enable(void)
{
uint64_t misc;
misc = iocsr_read64(LOONGARCH_IOCSR_MISC_FUNC);
misc |= IOCSR_MISC_FUNC_EXT_IOI_EN;
iocsr_write64(misc, LOONGARCH_IOCSR_MISC_FUNC);
}
struct acpi_madt_lio_pic;
struct acpi_madt_eio_pic;
struct acpi_madt_ht_pic;
struct acpi_madt_bio_pic;
struct acpi_madt_msi_pic;
struct acpi_madt_lpc_pic;
struct irq_domain *loongarch_cpu_irq_init(void);
struct irq_domain *liointc_acpi_init(struct irq_domain *parent,
struct acpi_madt_lio_pic *acpi_liointc);
struct irq_domain *eiointc_acpi_init(struct irq_domain *parent,
struct acpi_madt_eio_pic *acpi_eiointc);
struct irq_domain *htvec_acpi_init(struct irq_domain *parent,
struct acpi_madt_ht_pic *acpi_htvec);
struct irq_domain *pch_lpc_acpi_init(struct irq_domain *parent,
struct acpi_madt_lpc_pic *acpi_pchlpc);
struct irq_domain *pch_msi_acpi_init(struct irq_domain *parent,
struct acpi_madt_msi_pic *acpi_pchmsi);
struct irq_domain *pch_pic_acpi_init(struct irq_domain *parent,
struct acpi_madt_bio_pic *acpi_pchpic);
extern struct acpi_madt_lio_pic *acpi_liointc;
extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
extern struct acpi_madt_ht_pic *acpi_htintc;
extern struct acpi_madt_lpc_pic *acpi_pchlpc;
extern struct acpi_madt_msi_pic *acpi_pchmsi[MAX_IO_PICS];
extern struct acpi_madt_bio_pic *acpi_pchpic[MAX_IO_PICS];
extern struct irq_domain *cpu_domain;
extern struct irq_domain *liointc_domain;
extern struct irq_domain *pch_lpc_domain;
extern struct irq_domain *pch_msi_domain[MAX_IO_PICS];
extern struct irq_domain *pch_pic_domain[MAX_IO_PICS];
#include <asm-generic/irq.h>
#endif /* _ASM_IRQ_H */

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arch/loongarch/include/asm/irq_regs.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef __ASM_IRQ_REGS_H
#define __ASM_IRQ_REGS_H
#define ARCH_HAS_OWN_IRQ_REGS
#include <linux/thread_info.h>
static inline struct pt_regs *get_irq_regs(void)
{
return current_thread_info()->regs;
}
static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
{
struct pt_regs *old_regs;
old_regs = get_irq_regs();
current_thread_info()->regs = new_regs;
return old_regs;
}
#endif /* __ASM_IRQ_REGS_H */

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arch/loongarch/include/asm/irqflags.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/stringify.h>
#include <asm/compiler.h>
#include <asm/loongarch.h>
static inline void arch_local_irq_enable(void)
{
u32 flags = CSR_CRMD_IE;
__asm__ __volatile__(
"csrxchg %[val], %[mask], %[reg]\n\t"
: [val] "+r" (flags)
: [mask] "r" (CSR_CRMD_IE), [reg] "i" (LOONGARCH_CSR_CRMD)
: "memory");
}
static inline void arch_local_irq_disable(void)
{
u32 flags = 0;
__asm__ __volatile__(
"csrxchg %[val], %[mask], %[reg]\n\t"
: [val] "+r" (flags)
: [mask] "r" (CSR_CRMD_IE), [reg] "i" (LOONGARCH_CSR_CRMD)
: "memory");
}
static inline unsigned long arch_local_irq_save(void)
{
u32 flags = 0;
__asm__ __volatile__(
"csrxchg %[val], %[mask], %[reg]\n\t"
: [val] "+r" (flags)
: [mask] "r" (CSR_CRMD_IE), [reg] "i" (LOONGARCH_CSR_CRMD)
: "memory");
return flags;
}
static inline void arch_local_irq_restore(unsigned long flags)
{
__asm__ __volatile__(
"csrxchg %[val], %[mask], %[reg]\n\t"
: [val] "+r" (flags)
: [mask] "r" (CSR_CRMD_IE), [reg] "i" (LOONGARCH_CSR_CRMD)
: "memory");
}
static inline unsigned long arch_local_save_flags(void)
{
u32 flags;
__asm__ __volatile__(
"csrrd %[val], %[reg]\n\t"
: [val] "=r" (flags)
: [reg] "i" (LOONGARCH_CSR_CRMD)
: "memory");
return flags;
}
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
return !(flags & CSR_CRMD_IE);
}
static inline int arch_irqs_disabled(void)
{
return arch_irqs_disabled_flags(arch_local_save_flags());
}
#endif /* #ifndef __ASSEMBLY__ */
#endif /* _ASM_IRQFLAGS_H */

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arch/loongarch/include/asm/kdebug.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_LOONGARCH_KDEBUG_H
#define _ASM_LOONGARCH_KDEBUG_H
#include <linux/notifier.h>
enum die_val {
DIE_OOPS = 1,
DIE_RI,
DIE_FP,
DIE_SIMD,
DIE_TRAP,
DIE_PAGE_FAULT,
DIE_BREAK,
DIE_SSTEPBP,
DIE_UPROBE,
DIE_UPROBE_XOL,
};
#endif /* _ASM_LOONGARCH_KDEBUG_H */

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arch/loongarch/include/asm/stackframe.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_STACKFRAME_H
#define _ASM_STACKFRAME_H
#include <linux/threads.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/asm-offsets.h>
#include <asm/loongarch.h>
#include <asm/thread_info.h>
/* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0
.if \docfi
.cfi_rel_offset \reg, \offset
.endif
.endm
.macro cfi_st reg offset=0 docfi=0
cfi_rel_offset \reg, \offset, \docfi
LONG_S \reg, sp, \offset
.endm
.macro cfi_restore reg offset=0 docfi=0
.if \docfi
.cfi_restore \reg
.endif
.endm
.macro cfi_ld reg offset=0 docfi=0
LONG_L \reg, sp, \offset
cfi_restore \reg \offset \docfi
.endm
.macro BACKUP_T0T1
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
.endm
.macro RELOAD_T0T1
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
.endm
.macro SAVE_TEMP docfi=0
RELOAD_T0T1
cfi_st t0, PT_R12, \docfi
cfi_st t1, PT_R13, \docfi
cfi_st t2, PT_R14, \docfi
cfi_st t3, PT_R15, \docfi
cfi_st t4, PT_R16, \docfi
cfi_st t5, PT_R17, \docfi
cfi_st t6, PT_R18, \docfi
cfi_st t7, PT_R19, \docfi
cfi_st t8, PT_R20, \docfi
.endm
.macro SAVE_STATIC docfi=0
cfi_st s0, PT_R23, \docfi
cfi_st s1, PT_R24, \docfi
cfi_st s2, PT_R25, \docfi
cfi_st s3, PT_R26, \docfi
cfi_st s4, PT_R27, \docfi
cfi_st s5, PT_R28, \docfi
cfi_st s6, PT_R29, \docfi
cfi_st s7, PT_R30, \docfi
cfi_st s8, PT_R31, \docfi
.endm
/*
* get_saved_sp returns the SP for the current CPU by looking in the
* kernelsp array for it. It stores the current sp in t0 and loads the
* new value in sp.
*/
.macro get_saved_sp docfi=0
la.abs t1, kernelsp
move t0, sp
.if \docfi
.cfi_register sp, t0
.endif
LONG_L sp, t1, 0
.endm
.macro set_saved_sp stackp temp temp2
la.abs \temp, kernelsp
LONG_S \stackp, \temp, 0
.endm
.macro SAVE_SOME docfi=0
csrrd t1, LOONGARCH_CSR_PRMD
andi t1, t1, 0x3 /* extract pplv bit */
move t0, sp
beqz t1, 8f
/* Called from user mode, new stack. */
get_saved_sp docfi=\docfi
8:
PTR_ADDI sp, sp, -PT_SIZE
.if \docfi
.cfi_def_cfa sp, 0
.endif
cfi_st t0, PT_R3, \docfi
cfi_rel_offset sp, PT_R3, \docfi
LONG_S zero, sp, PT_R0
csrrd t0, LOONGARCH_CSR_PRMD
LONG_S t0, sp, PT_PRMD
csrrd t0, LOONGARCH_CSR_CRMD
LONG_S t0, sp, PT_CRMD
csrrd t0, LOONGARCH_CSR_EUEN
LONG_S t0, sp, PT_EUEN
csrrd t0, LOONGARCH_CSR_ECFG
LONG_S t0, sp, PT_ECFG
csrrd t0, LOONGARCH_CSR_ESTAT
PTR_S t0, sp, PT_ESTAT
cfi_st ra, PT_R1, \docfi
cfi_st a0, PT_R4, \docfi
cfi_st a1, PT_R5, \docfi
cfi_st a2, PT_R6, \docfi
cfi_st a3, PT_R7, \docfi
cfi_st a4, PT_R8, \docfi
cfi_st a5, PT_R9, \docfi
cfi_st a6, PT_R10, \docfi
cfi_st a7, PT_R11, \docfi
csrrd ra, LOONGARCH_CSR_ERA
LONG_S ra, sp, PT_ERA
.if \docfi
.cfi_rel_offset ra, PT_ERA
.endif
cfi_st tp, PT_R2, \docfi
cfi_st fp, PT_R22, \docfi
/* Set thread_info if we're coming from user mode */
csrrd t0, LOONGARCH_CSR_PRMD
andi t0, t0, 0x3 /* extract pplv bit */
beqz t0, 9f
li.d tp, ~_THREAD_MASK
and tp, tp, sp
cfi_st u0, PT_R21, \docfi
csrrd u0, PERCPU_BASE_KS
9:
.endm
.macro SAVE_ALL docfi=0
SAVE_SOME \docfi
SAVE_TEMP \docfi
SAVE_STATIC \docfi
.endm
.macro RESTORE_TEMP docfi=0
cfi_ld t0, PT_R12, \docfi
cfi_ld t1, PT_R13, \docfi
cfi_ld t2, PT_R14, \docfi
cfi_ld t3, PT_R15, \docfi
cfi_ld t4, PT_R16, \docfi
cfi_ld t5, PT_R17, \docfi
cfi_ld t6, PT_R18, \docfi
cfi_ld t7, PT_R19, \docfi
cfi_ld t8, PT_R20, \docfi
.endm
.macro RESTORE_STATIC docfi=0
cfi_ld s0, PT_R23, \docfi
cfi_ld s1, PT_R24, \docfi
cfi_ld s2, PT_R25, \docfi
cfi_ld s3, PT_R26, \docfi
cfi_ld s4, PT_R27, \docfi
cfi_ld s5, PT_R28, \docfi
cfi_ld s6, PT_R29, \docfi
cfi_ld s7, PT_R30, \docfi
cfi_ld s8, PT_R31, \docfi
.endm
.macro RESTORE_SOME docfi=0
LONG_L a0, sp, PT_PRMD
andi a0, a0, 0x3 /* extract pplv bit */
beqz a0, 8f
cfi_ld u0, PT_R21, \docfi
8:
LONG_L a0, sp, PT_ERA
csrwr a0, LOONGARCH_CSR_ERA
LONG_L a0, sp, PT_PRMD
csrwr a0, LOONGARCH_CSR_PRMD
cfi_ld ra, PT_R1, \docfi
cfi_ld a0, PT_R4, \docfi
cfi_ld a1, PT_R5, \docfi
cfi_ld a2, PT_R6, \docfi
cfi_ld a3, PT_R7, \docfi
cfi_ld a4, PT_R8, \docfi
cfi_ld a5, PT_R9, \docfi
cfi_ld a6, PT_R10, \docfi
cfi_ld a7, PT_R11, \docfi
cfi_ld tp, PT_R2, \docfi
cfi_ld fp, PT_R22, \docfi
.endm
.macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi
ertn
.endm
.macro RESTORE_ALL_AND_RET docfi=0
RESTORE_STATIC \docfi
RESTORE_TEMP \docfi
RESTORE_SOME \docfi
RESTORE_SP_AND_RET \docfi
.endm
#endif /* _ASM_STACKFRAME_H */

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_STACKTRACE_H
#define _ASM_STACKTRACE_H
#include <asm/asm.h>
#include <asm/ptrace.h>
#include <asm/loongarch.h>
#include <linux/stringify.h>
#define STR_LONG_L __stringify(LONG_L)
#define STR_LONG_S __stringify(LONG_S)
#define STR_LONGSIZE __stringify(LONGSIZE)
#define STORE_ONE_REG(r) \
STR_LONG_S " $r" __stringify(r)", %1, "STR_LONGSIZE"*"__stringify(r)"\n\t"
#define CSRRD_ONE_REG(reg) \
__stringify(csrrd) " %0, "__stringify(reg)"\n\t"
static __always_inline void prepare_frametrace(struct pt_regs *regs)
{
__asm__ __volatile__(
/* Save $r1 */
STORE_ONE_REG(1)
/* Use $r1 to save PC */
"pcaddi $r1, 0\n\t"
STR_LONG_S " $r1, %0\n\t"
/* Restore $r1 */
STR_LONG_L " $r1, %1, "STR_LONGSIZE"\n\t"
STORE_ONE_REG(2)
STORE_ONE_REG(3)
STORE_ONE_REG(4)
STORE_ONE_REG(5)
STORE_ONE_REG(6)
STORE_ONE_REG(7)
STORE_ONE_REG(8)
STORE_ONE_REG(9)
STORE_ONE_REG(10)
STORE_ONE_REG(11)
STORE_ONE_REG(12)
STORE_ONE_REG(13)
STORE_ONE_REG(14)
STORE_ONE_REG(15)
STORE_ONE_REG(16)
STORE_ONE_REG(17)
STORE_ONE_REG(18)
STORE_ONE_REG(19)
STORE_ONE_REG(20)
STORE_ONE_REG(21)
STORE_ONE_REG(22)
STORE_ONE_REG(23)
STORE_ONE_REG(24)
STORE_ONE_REG(25)
STORE_ONE_REG(26)
STORE_ONE_REG(27)
STORE_ONE_REG(28)
STORE_ONE_REG(29)
STORE_ONE_REG(30)
STORE_ONE_REG(31)
: "=m" (regs->csr_era)
: "r" (regs->regs)
: "memory");
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_BADV) : "=r" (regs->csr_badvaddr));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_CRMD) : "=r" (regs->csr_crmd));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_PRMD) : "=r" (regs->csr_prmd));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_EUEN) : "=r" (regs->csr_euen));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ECFG) : "=r" (regs->csr_ecfg));
__asm__ __volatile__(CSRRD_ONE_REG(LOONGARCH_CSR_ESTAT) : "=r" (regs->csr_estat));
}
#endif /* _ASM_STACKTRACE_H */

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arch/loongarch/include/uapi/asm/break.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef __UAPI_ASM_BREAK_H
#define __UAPI_ASM_BREAK_H
#define BRK_DEFAULT 0 /* Used as default */
#define BRK_BUG 1 /* Used by BUG() */
#define BRK_KDB 2 /* Used in KDB_ENTER() */
#define BRK_MATHEMU 3 /* Used by FPU emulator */
#define BRK_USERBP 4 /* User bp (used by debuggers) */
#define BRK_SSTEPBP 5 /* User bp (used by debuggers) */
#define BRK_OVERFLOW 6 /* Overflow check */
#define BRK_DIVZERO 7 /* Divide by zero check */
#define BRK_RANGE 8 /* Range error check */
#define BRK_MULOVFL 9 /* Multiply overflow */
#define BRK_KPROBE_BP 10 /* Kprobe break */
#define BRK_KPROBE_SSTEPBP 11 /* Kprobe single step break */
#define BRK_UPROBE_BP 12 /* See <asm/uprobes.h> */
#define BRK_UPROBE_XOLBP 13 /* See <asm/uprobes.h> */
#endif /* __UAPI_ASM_BREAK_H */

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arch/loongarch/kernel/access-helper.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/uaccess.h>
static inline int __get_inst(u32 *i, u32 *p, bool user)
{
return user ? get_user(*i, (u32 __user *)p) : get_kernel_nofault(*i, p);
}
static inline int __get_addr(unsigned long *a, unsigned long *p, bool user)
{
return user ? get_user(*a, (unsigned long __user *)p) : get_kernel_nofault(*a, p);
}

95
arch/loongarch/kernel/genex.S Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*
* Derived from MIPS:
* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2002, 2007 Maciej W. Rozycki
* Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved.
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/loongarch.h>
#include <asm/regdef.h>
#include <asm/fpregdef.h>
#include <asm/stackframe.h>
#include <asm/thread_info.h>
.align 5
SYM_FUNC_START(__arch_cpu_idle)
/* start of rollback region */
LONG_L t0, tp, TI_FLAGS
nop
andi t0, t0, _TIF_NEED_RESCHED
bnez t0, 1f
nop
nop
nop
idle 0
/* end of rollback region */
1: jirl zero, ra, 0
SYM_FUNC_END(__arch_cpu_idle)
SYM_FUNC_START(handle_vint)
BACKUP_T0T1
SAVE_ALL
la.abs t1, __arch_cpu_idle
LONG_L t0, sp, PT_ERA
/* 32 byte rollback region */
ori t0, t0, 0x1f
xori t0, t0, 0x1f
bne t0, t1, 1f
LONG_S t0, sp, PT_ERA
1: move a0, sp
move a1, sp
la.abs t0, do_vint
jirl ra, t0, 0
RESTORE_ALL_AND_RET
SYM_FUNC_END(handle_vint)
SYM_FUNC_START(except_vec_cex)
b cache_parity_error
SYM_FUNC_END(except_vec_cex)
.macro build_prep_badv
csrrd t0, LOONGARCH_CSR_BADV
PTR_S t0, sp, PT_BVADDR
.endm
.macro build_prep_fcsr
movfcsr2gr a1, fcsr0
.endm
.macro build_prep_none
.endm
.macro BUILD_HANDLER exception handler prep
.align 5
SYM_FUNC_START(handle_\exception)
BACKUP_T0T1
SAVE_ALL
build_prep_\prep
move a0, sp
la.abs t0, do_\handler
jirl ra, t0, 0
RESTORE_ALL_AND_RET
SYM_FUNC_END(handle_\exception)
.endm
BUILD_HANDLER ade ade badv
BUILD_HANDLER ale ale badv
BUILD_HANDLER bp bp none
BUILD_HANDLER fpe fpe fcsr
BUILD_HANDLER fpu fpu none
BUILD_HANDLER lsx lsx none
BUILD_HANDLER lasx lasx none
BUILD_HANDLER lbt lbt none
BUILD_HANDLER ri ri none
BUILD_HANDLER watch watch none
BUILD_HANDLER reserved reserved none /* others */
SYM_FUNC_START(handle_sys)
la.abs t0, handle_syscall
jirl zero, t0, 0
SYM_FUNC_END(handle_sys)

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arch/loongarch/kernel/irq.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <asm/irq.h>
#include <asm/loongson.h>
#include <asm/setup.h>
DEFINE_PER_CPU(unsigned long, irq_stack);
struct irq_domain *cpu_domain;
struct irq_domain *liointc_domain;
struct irq_domain *pch_lpc_domain;
struct irq_domain *pch_msi_domain[MAX_IO_PICS];
struct irq_domain *pch_pic_domain[MAX_IO_PICS];
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
*/
void ack_bad_irq(unsigned int irq)
{
pr_warn("Unexpected IRQ # %d\n", irq);
}
atomic_t irq_err_count;
asmlinkage void spurious_interrupt(void)
{
atomic_inc(&irq_err_count);
}
int arch_show_interrupts(struct seq_file *p, int prec)
{
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
return 0;
}
void __init init_IRQ(void)
{
int i;
unsigned int order = get_order(IRQ_STACK_SIZE);
struct page *page;
clear_csr_ecfg(ECFG0_IM);
clear_csr_estat(ESTATF_IP);
irqchip_init();
for (i = 0; i < NR_IRQS; i++)
irq_set_noprobe(i);
for_each_possible_cpu(i) {
page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order);
per_cpu(irq_stack, i) = (unsigned long)page_address(page);
pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i,
per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE);
}
set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC);
}

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// SPDX-License-Identifier: GPL-2.0
/*
* Author: Huacai Chen <chenhuacai@loongson.cn>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/context_tracking.h>
#include <linux/entry-common.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/extable.h>
#include <linux/mm.h>
#include <linux/sched/mm.h>
#include <linux/sched/debug.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/memblock.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/kprobes.h>
#include <linux/notifier.h>
#include <linux/irq.h>
#include <linux/perf_event.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
#include <asm/break.h>
#include <asm/cpu.h>
#include <asm/fpu.h>
#include <asm/loongarch.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/siginfo.h>
#include <asm/stacktrace.h>
#include <asm/tlb.h>
#include <asm/types.h>
#include "access-helper.h"
extern asmlinkage void handle_ade(void);
extern asmlinkage void handle_ale(void);
extern asmlinkage void handle_sys(void);
extern asmlinkage void handle_bp(void);
extern asmlinkage void handle_ri(void);
extern asmlinkage void handle_fpu(void);
extern asmlinkage void handle_fpe(void);
extern asmlinkage void handle_lbt(void);
extern asmlinkage void handle_lsx(void);
extern asmlinkage void handle_lasx(void);
extern asmlinkage void handle_reserved(void);
extern asmlinkage void handle_watch(void);
extern asmlinkage void handle_vint(void);
static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
const char *loglvl, bool user)
{
unsigned long addr;
unsigned long *sp = (unsigned long *)(regs->regs[3] & ~3);
printk("%sCall Trace:", loglvl);
#ifdef CONFIG_KALLSYMS
printk("%s\n", loglvl);
#endif
while (!kstack_end(sp)) {
if (__get_addr(&addr, sp++, user)) {
printk("%s (Bad stack address)", loglvl);
break;
}
if (__kernel_text_address(addr))
print_ip_sym(loglvl, addr);
}
printk("%s\n", loglvl);
}
static void show_stacktrace(struct task_struct *task,
const struct pt_regs *regs, const char *loglvl, bool user)
{
int i;
const int field = 2 * sizeof(unsigned long);
unsigned long stackdata;
unsigned long *sp = (unsigned long *)regs->regs[3];
printk("%sStack :", loglvl);
i = 0;
while ((unsigned long) sp & (PAGE_SIZE - 1)) {
if (i && ((i % (64 / field)) == 0)) {
pr_cont("\n");
printk("%s ", loglvl);
}
if (i > 39) {
pr_cont(" ...");
break;
}
if (__get_addr(&stackdata, sp++, user)) {
pr_cont(" (Bad stack address)");
break;
}
pr_cont(" %0*lx", field, stackdata);
i++;
}
pr_cont("\n");
show_backtrace(task, regs, loglvl, user);
}
void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
{
struct pt_regs regs;
regs.csr_crmd = 0;
if (sp) {
regs.csr_era = 0;
regs.regs[1] = 0;
regs.regs[3] = (unsigned long)sp;
} else {
if (!task || task == current)
prepare_frametrace(&regs);
else {
regs.csr_era = task->thread.reg01;
regs.regs[1] = 0;
regs.regs[3] = task->thread.reg03;
regs.regs[22] = task->thread.reg22;
}
}
show_stacktrace(task, &regs, loglvl, false);
}
static void show_code(unsigned int *pc, bool user)
{
long i;
unsigned int insn;
printk("Code:");
for(i = -3 ; i < 6 ; i++) {
if (__get_inst(&insn, pc + i, user)) {
pr_cont(" (Bad address in era)\n");
break;
}
pr_cont("%c%08x%c", (i?' ':'<'), insn, (i?' ':'>'));
}
pr_cont("\n");
}
static void __show_regs(const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
unsigned int excsubcode;
unsigned int exccode;
int i;
show_regs_print_info(KERN_DEFAULT);
/*
* Saved main processor registers
*/
for (i = 0; i < 32; ) {
if ((i % 4) == 0)
printk("$%2d :", i);
pr_cont(" %0*lx", field, regs->regs[i]);
i++;
if ((i % 4) == 0)
pr_cont("\n");
}
/*
* Saved csr registers
*/
printk("era : %0*lx %pS\n", field, regs->csr_era,
(void *) regs->csr_era);
printk("ra : %0*lx %pS\n", field, regs->regs[1],
(void *) regs->regs[1]);
printk("CSR crmd: %08lx ", regs->csr_crmd);
printk("CSR prmd: %08lx ", regs->csr_prmd);
printk("CSR euen: %08lx ", regs->csr_euen);
printk("CSR ecfg: %08lx ", regs->csr_ecfg);
printk("CSR estat: %08lx ", regs->csr_estat);
pr_cont("\n");
exccode = ((regs->csr_estat) & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
excsubcode = ((regs->csr_estat) & CSR_ESTAT_ESUBCODE) >> CSR_ESTAT_ESUBCODE_SHIFT;
printk("ExcCode : %x (SubCode %x)\n", exccode, excsubcode);
if (exccode >= EXCCODE_TLBL && exccode <= EXCCODE_ALE)
printk("BadVA : %0*lx\n", field, regs->csr_badvaddr);
printk("PrId : %08x (%s)\n", read_cpucfg(LOONGARCH_CPUCFG0),
cpu_family_string());
}
void show_regs(struct pt_regs *regs)
{
__show_regs((struct pt_regs *)regs);
dump_stack();
}
void show_registers(struct pt_regs *regs)
{
__show_regs(regs);
print_modules();
printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n",
current->comm, current->pid, current_thread_info(), current);
show_stacktrace(current, regs, KERN_DEFAULT, user_mode(regs));
show_code((void *)regs->csr_era, user_mode(regs));
printk("\n");
}
static DEFINE_RAW_SPINLOCK(die_lock);
void __noreturn die(const char *str, struct pt_regs *regs)
{
static int die_counter;
int sig = SIGSEGV;
oops_enter();
if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr,
SIGSEGV) == NOTIFY_STOP)
sig = 0;
console_verbose();
raw_spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk("%s[#%d]:\n", str, ++die_counter);
show_registers(regs);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
raw_spin_unlock_irq(&die_lock);
oops_exit();
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
make_task_dead(sig);
}
static inline void setup_vint_size(unsigned int size)
{
unsigned int vs;
vs = ilog2(size/4);
if (vs == 0 || vs > 7)
panic("vint_size %d Not support yet", vs);
csr_xchg32(vs<<CSR_ECFG_VS_SHIFT, CSR_ECFG_VS, LOONGARCH_CSR_ECFG);
}
/*
* Send SIGFPE according to FCSR Cause bits, which must have already
* been masked against Enable bits. This is impotant as Inexact can
* happen together with Overflow or Underflow, and `ptrace' can set
* any bits.
*/
void force_fcsr_sig(unsigned long fcsr, void __user *fault_addr,
struct task_struct *tsk)
{
int si_code = FPE_FLTUNK;
if (fcsr & FPU_CSR_INV_X)
si_code = FPE_FLTINV;
else if (fcsr & FPU_CSR_DIV_X)
si_code = FPE_FLTDIV;
else if (fcsr & FPU_CSR_OVF_X)
si_code = FPE_FLTOVF;
else if (fcsr & FPU_CSR_UDF_X)
si_code = FPE_FLTUND;
else if (fcsr & FPU_CSR_INE_X)
si_code = FPE_FLTRES;
force_sig_fault(SIGFPE, si_code, fault_addr);
}
int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcsr)
{
int si_code;
switch (sig) {
case 0:
return 0;
case SIGFPE:
force_fcsr_sig(fcsr, fault_addr, current);
return 1;
case SIGBUS:
force_sig_fault(SIGBUS, BUS_ADRERR, fault_addr);
return 1;
case SIGSEGV:
mmap_read_lock(current->mm);
if (vma_lookup(current->mm, (unsigned long)fault_addr))
si_code = SEGV_ACCERR;
else
si_code = SEGV_MAPERR;
mmap_read_unlock(current->mm);
force_sig_fault(SIGSEGV, si_code, fault_addr);
return 1;
default:
force_sig(sig);
return 1;
}
}
/*
* Delayed fp exceptions when doing a lazy ctx switch
*/
asmlinkage void noinstr do_fpe(struct pt_regs *regs, unsigned long fcsr)
{
int sig;
void __user *fault_addr;
irqentry_state_t state = irqentry_enter(regs);
if (notify_die(DIE_FP, "FP exception", regs, 0, current->thread.trap_nr,
SIGFPE) == NOTIFY_STOP)
goto out;
/* Clear FCSR.Cause before enabling interrupts */
write_fcsr(LOONGARCH_FCSR0, fcsr & ~mask_fcsr_x(fcsr));
local_irq_enable();
die_if_kernel("FP exception in kernel code", regs);
sig = SIGFPE;
fault_addr = (void __user *) regs->csr_era;
/* Send a signal if required. */
process_fpemu_return(sig, fault_addr, fcsr);
out:
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_ade(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
die_if_kernel("Kernel ade access", regs);
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)regs->csr_badvaddr);
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_ale(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
die_if_kernel("Kernel ale access", regs);
force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)regs->csr_badvaddr);
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_bp(struct pt_regs *regs)
{
bool user = user_mode(regs);
unsigned int opcode, bcode;
unsigned long era = exception_era(regs);
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
current->thread.trap_nr = read_csr_excode();
if (__get_inst(&opcode, (u32 *)era, user))
goto out_sigsegv;
bcode = (opcode & 0x7fff);
/*
* notify the kprobe handlers, if instruction is likely to
* pertain to them.
*/
switch (bcode) {
case BRK_KPROBE_BP:
if (notify_die(DIE_BREAK, "Kprobe", regs, bcode,
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
case BRK_KPROBE_SSTEPBP:
if (notify_die(DIE_SSTEPBP, "Kprobe_SingleStep", regs, bcode,
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
case BRK_UPROBE_BP:
if (notify_die(DIE_UPROBE, "Uprobe", regs, bcode,
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
case BRK_UPROBE_XOLBP:
if (notify_die(DIE_UPROBE_XOL, "Uprobe_XOL", regs, bcode,
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
default:
if (notify_die(DIE_TRAP, "Break", regs, bcode,
current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
}
switch (bcode) {
case BRK_BUG:
die_if_kernel("Kernel bug detected", regs);
force_sig(SIGTRAP);
break;
case BRK_DIVZERO:
die_if_kernel("Break instruction in kernel code", regs);
force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->csr_era);
break;
case BRK_OVERFLOW:
die_if_kernel("Break instruction in kernel code", regs);
force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->csr_era);
break;
default:
die_if_kernel("Break instruction in kernel code", regs);
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->csr_era);
break;
}
out:
local_irq_disable();
irqentry_exit(regs, state);
return;
out_sigsegv:
force_sig(SIGSEGV);
goto out;
}
asmlinkage void noinstr do_watch(struct pt_regs *regs)
{
pr_warn("Hardware watch point handler not implemented!\n");
}
asmlinkage void noinstr do_ri(struct pt_regs *regs)
{
int status = -1;
unsigned int opcode = 0;
unsigned int __user *era = (unsigned int __user *)exception_era(regs);
unsigned long old_era = regs->csr_era;
unsigned long old_ra = regs->regs[1];
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
current->thread.trap_nr = read_csr_excode();
if (notify_die(DIE_RI, "RI Fault", regs, 0, current->thread.trap_nr,
SIGILL) == NOTIFY_STOP)
goto out;
die_if_kernel("Reserved instruction in kernel code", regs);
if (unlikely(compute_return_era(regs) < 0))
goto out;
if (unlikely(get_user(opcode, era) < 0)) {
status = SIGSEGV;
current->thread.error_code = 1;
}
if (status < 0)
status = SIGILL;
if (unlikely(status > 0)) {
regs->csr_era = old_era; /* Undo skip-over. */
regs->regs[1] = old_ra;
force_sig(status);
}
out:
local_irq_disable();
irqentry_exit(regs, state);
}
static void init_restore_fp(void)
{
if (!used_math()) {
/* First time FP context user. */
init_fpu();
} else {
/* This task has formerly used the FP context */
if (!is_fpu_owner())
own_fpu_inatomic(1);
}
BUG_ON(!is_fp_enabled());
}
asmlinkage void noinstr do_fpu(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
die_if_kernel("do_fpu invoked from kernel context!", regs);
preempt_disable();
init_restore_fp();
preempt_enable();
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_lsx(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
force_sig(SIGILL);
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_lasx(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
force_sig(SIGILL);
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_lbt(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
force_sig(SIGILL);
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void noinstr do_reserved(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
local_irq_enable();
/*
* Game over - no way to handle this if it ever occurs. Most probably
* caused by a fatal error after another hardware/software error.
*/
pr_err("Caught reserved exception %u on pid:%d [%s] - should not happen\n",
read_csr_excode(), current->pid, current->comm);
die_if_kernel("do_reserved exception", regs);
force_sig(SIGUNUSED);
local_irq_disable();
irqentry_exit(regs, state);
}
asmlinkage void cache_parity_error(void)
{
/* For the moment, report the problem and hang. */
pr_err("Cache error exception:\n");
pr_err("csr_merrctl == %08x\n", csr_read32(LOONGARCH_CSR_MERRCTL));
pr_err("csr_merrera == %016llx\n", csr_read64(LOONGARCH_CSR_MERRERA));
panic("Can't handle the cache error!");
}
asmlinkage void noinstr handle_loongarch_irq(struct pt_regs *regs)
{
struct pt_regs *old_regs;
irq_enter_rcu();
old_regs = set_irq_regs(regs);
handle_arch_irq(regs);
set_irq_regs(old_regs);
irq_exit_rcu();
}
asmlinkage void noinstr do_vint(struct pt_regs *regs, unsigned long sp)
{
register int cpu;
register unsigned long stack;
irqentry_state_t state = irqentry_enter(regs);
cpu = smp_processor_id();
if (on_irq_stack(cpu, sp))
handle_loongarch_irq(regs);
else {
stack = per_cpu(irq_stack, cpu) + IRQ_STACK_START;
/* Save task's sp on IRQ stack for unwinding */
*(unsigned long *)stack = sp;
__asm__ __volatile__(
"move $s0, $sp \n" /* Preserve sp */
"move $sp, %[stk] \n" /* Switch stack */
"move $a0, %[regs] \n"
"bl handle_loongarch_irq \n"
"move $sp, $s0 \n" /* Restore sp */
: /* No outputs */
: [stk] "r" (stack), [regs] "r" (regs)
: "$a0", "$a1", "$a2", "$a3", "$a4", "$a5", "$a6", "$a7", "$s0",
"$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8",
"memory");
}
irqentry_exit(regs, state);
}
extern void tlb_init(void);
extern void cache_error_setup(void);
unsigned long eentry;
unsigned long tlbrentry;
long exception_handlers[VECSIZE * 128 / sizeof(long)] __aligned(SZ_64K);
static void configure_exception_vector(void)
{
eentry = (unsigned long)exception_handlers;
tlbrentry = (unsigned long)exception_handlers + 80*VECSIZE;
csr_write64(eentry, LOONGARCH_CSR_EENTRY);
csr_write64(eentry, LOONGARCH_CSR_MERRENTRY);
csr_write64(tlbrentry, LOONGARCH_CSR_TLBRENTRY);
}
void per_cpu_trap_init(int cpu)
{
unsigned int i;
setup_vint_size(VECSIZE);
configure_exception_vector();
if (!cpu_data[cpu].asid_cache)
cpu_data[cpu].asid_cache = asid_first_version(cpu);
mmgrab(&init_mm);
current->active_mm = &init_mm;
BUG_ON(current->mm);
enter_lazy_tlb(&init_mm, current);
/* Initialise exception handlers */
if (cpu == 0)
for (i = 0; i < 64; i++)
set_handler(i * VECSIZE, handle_reserved, VECSIZE);
tlb_init();
cpu_cache_init();
}
/* Install CPU exception handler */
void set_handler(unsigned long offset, void *addr, unsigned long size)
{
memcpy((void *)(eentry + offset), addr, size);
local_flush_icache_range(eentry + offset, eentry + offset + size);
}
static const char panic_null_cerr[] =
"Trying to set NULL cache error exception handler\n";
/*
* Install uncached CPU exception handler.
* This is suitable only for the cache error exception which is the only
* exception handler that is being run uncached.
*/
void set_merr_handler(unsigned long offset, void *addr, unsigned long size)
{
unsigned long uncached_eentry = TO_UNCACHE(__pa(eentry));
if (!addr)
panic(panic_null_cerr);
memcpy((void *)(uncached_eentry + offset), addr, size);
}
void __init trap_init(void)
{
long i;
/* Set interrupt vector handler */
for (i = EXCCODE_INT_START; i < EXCCODE_INT_END; i++)
set_handler(i * VECSIZE, handle_vint, VECSIZE);
set_handler(EXCCODE_ADE * VECSIZE, handle_ade, VECSIZE);
set_handler(EXCCODE_ALE * VECSIZE, handle_ale, VECSIZE);
set_handler(EXCCODE_SYS * VECSIZE, handle_sys, VECSIZE);
set_handler(EXCCODE_BP * VECSIZE, handle_bp, VECSIZE);
set_handler(EXCCODE_INE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_IPE * VECSIZE, handle_ri, VECSIZE);
set_handler(EXCCODE_FPDIS * VECSIZE, handle_fpu, VECSIZE);
set_handler(EXCCODE_LSXDIS * VECSIZE, handle_lsx, VECSIZE);
set_handler(EXCCODE_LASXDIS * VECSIZE, handle_lasx, VECSIZE);
set_handler(EXCCODE_FPE * VECSIZE, handle_fpe, VECSIZE);
set_handler(EXCCODE_BTDIS * VECSIZE, handle_lbt, VECSIZE);
set_handler(EXCCODE_WATCH * VECSIZE, handle_watch, VECSIZE);
cache_error_setup();
local_flush_icache_range(eentry, eentry + 0x400);
}