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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 idle interrupt region */
- ori t0, zero, CSR_CRMD_IE
- /* idle instruction needs irq enabled */
- csrxchg t0, t0, LOONGARCH_CSR_CRMD
- /*
- * If an interrupt lands here; between enabling interrupts above and
- * going idle on the next instruction, we must *NOT* go idle since the
- * interrupt could have set TIF_NEED_RESCHED or caused an timer to need
- * reprogramming. Fall through -- see handle_vint() below -- and have
- * the idle loop take care of things.
- */
- idle 0
- /* end of idle interrupt region */
- 1: jr ra
- SYM_FUNC_END(__arch_cpu_idle)
- SYM_CODE_START(handle_vint)
- UNWIND_HINT_UNDEFINED
- BACKUP_T0T1
- SAVE_ALL
- la_abs t1, 1b
- LONG_L t0, sp, PT_ERA
- /* 3 instructions idle interrupt region */
- ori t0, t0, 0b1100
- 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_CODE_END(handle_vint)
- SYM_CODE_START(except_vec_cex)
- UNWIND_HINT_UNDEFINED
- b cache_parity_error
- SYM_CODE_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_CODE_START(handle_\exception)
- UNWIND_HINT_UNDEFINED
- 666:
- BACKUP_T0T1
- SAVE_ALL
- build_prep_\prep
- move a0, sp
- la_abs t0, do_\handler
- jirl ra, t0, 0
- 668:
- RESTORE_ALL_AND_RET
- SYM_CODE_END(handle_\exception)
- .pushsection ".data", "aw", %progbits
- SYM_DATA(unwind_hint_\exception, .word 668b - 666b)
- .popsection
- .endm
- BUILD_HANDLER ade ade badv
- BUILD_HANDLER ale ale badv
- BUILD_HANDLER bce bce none
- 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_CODE_START(handle_sys)
- UNWIND_HINT_UNDEFINED
- la_abs t0, handle_syscall
- jr t0
- SYM_CODE_END(handle_sys)
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