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3f89765d62
This feature depends on the kernel being relocatable. Enable using single kernel image for kdump, and then no longer need to build two kernels (production kernel and capture kernel share a single kernel image). Also enable CONFIG_CRASH_DUMP in loongson3_defconfig. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
145 lines
3.2 KiB
ArmAsm
145 lines
3.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <asm/addrspace.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/bug.h>
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#include <asm/regdef.h>
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#include <asm/loongarch.h>
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#include <asm/stackframe.h>
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#ifdef CONFIG_EFI_STUB
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#include "efi-header.S"
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__HEAD
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_head:
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.word MZ_MAGIC /* "MZ", MS-DOS header */
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.org 0x8
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.dword kernel_entry /* Kernel entry point */
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.dword _end - _text /* Kernel image effective size */
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.quad PHYS_LINK_KADDR /* Kernel image load offset from start of RAM */
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.org 0x38 /* 0x20 ~ 0x37 reserved */
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.long LINUX_PE_MAGIC
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.long pe_header - _head /* Offset to the PE header */
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pe_header:
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__EFI_PE_HEADER
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SYM_DATA(kernel_asize, .long _end - _text);
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SYM_DATA(kernel_fsize, .long _edata - _text);
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SYM_DATA(kernel_offset, .long kernel_offset - _text);
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#endif
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__REF
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.align 12
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SYM_CODE_START(kernel_entry) # kernel entry point
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/* Config direct window and set PG */
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li.d t0, CSR_DMW0_INIT # UC, PLV0, 0x8000 xxxx xxxx xxxx
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csrwr t0, LOONGARCH_CSR_DMWIN0
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li.d t0, CSR_DMW1_INIT # CA, PLV0, 0x9000 xxxx xxxx xxxx
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csrwr t0, LOONGARCH_CSR_DMWIN1
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JUMP_VIRT_ADDR t0, t1
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/* Enable PG */
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li.w t0, 0xb0 # PLV=0, IE=0, PG=1
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csrwr t0, LOONGARCH_CSR_CRMD
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li.w t0, 0x04 # PLV=0, PIE=1, PWE=0
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csrwr t0, LOONGARCH_CSR_PRMD
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li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0
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csrwr t0, LOONGARCH_CSR_EUEN
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la.pcrel t0, __bss_start # clear .bss
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st.d zero, t0, 0
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la.pcrel t1, __bss_stop - LONGSIZE
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1:
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addi.d t0, t0, LONGSIZE
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st.d zero, t0, 0
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bne t0, t1, 1b
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la.pcrel t0, fw_arg0
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st.d a0, t0, 0 # firmware arguments
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la.pcrel t0, fw_arg1
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st.d a1, t0, 0
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la.pcrel t0, fw_arg2
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st.d a2, t0, 0
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/* KSave3 used for percpu base, initialized as 0 */
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csrwr zero, PERCPU_BASE_KS
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/* GPR21 used for percpu base (runtime), initialized as 0 */
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move u0, zero
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la.pcrel tp, init_thread_union
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/* Set the SP after an empty pt_regs. */
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PTR_LI sp, (_THREAD_SIZE - PT_SIZE)
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PTR_ADD sp, sp, tp
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set_saved_sp sp, t0, t1
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#ifdef CONFIG_RELOCATABLE
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bl relocate_kernel
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#ifdef CONFIG_RANDOMIZE_BASE
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/* Repoint the sp into the new kernel */
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PTR_LI sp, (_THREAD_SIZE - PT_SIZE)
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PTR_ADD sp, sp, tp
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set_saved_sp sp, t0, t1
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#endif
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/* relocate_kernel() returns the new kernel entry point */
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jr a0
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ASM_BUG()
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#endif
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bl start_kernel
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ASM_BUG()
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SYM_CODE_END(kernel_entry)
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#ifdef CONFIG_SMP
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/*
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* SMP slave cpus entry point. Board specific code for bootstrap calls this
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* function after setting up the stack and tp registers.
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*/
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SYM_CODE_START(smpboot_entry)
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li.d t0, CSR_DMW0_INIT # UC, PLV0
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csrwr t0, LOONGARCH_CSR_DMWIN0
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li.d t0, CSR_DMW1_INIT # CA, PLV0
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csrwr t0, LOONGARCH_CSR_DMWIN1
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JUMP_VIRT_ADDR t0, t1
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/* Enable PG */
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li.w t0, 0xb0 # PLV=0, IE=0, PG=1
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csrwr t0, LOONGARCH_CSR_CRMD
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li.w t0, 0x04 # PLV=0, PIE=1, PWE=0
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csrwr t0, LOONGARCH_CSR_PRMD
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li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0
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csrwr t0, LOONGARCH_CSR_EUEN
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la.pcrel t0, cpuboot_data
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ld.d sp, t0, CPU_BOOT_STACK
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ld.d tp, t0, CPU_BOOT_TINFO
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bl start_secondary
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ASM_BUG()
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SYM_CODE_END(smpboot_entry)
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#endif /* CONFIG_SMP */
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SYM_ENTRY(kernel_entry_end, SYM_L_GLOBAL, SYM_A_NONE)
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