1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology
4 */
5 #include <linux/init.h>
6 #include <linux/threads.h>
7
8 #include <asm/addrspace.h>
9 #include <asm/asm.h>
10 #include <asm/asmmacro.h>
11 #include <asm/bug.h>
12 #include <asm/regdef.h>
13 #include <asm/loongarch.h>
14 #include <asm/stackframe.h>
15
16 #ifdef CONFIG_EFI_STUB
17
18 #include "efi-header.S"
19
20 __HEAD
21
22 _head:
23 .word MZ_MAGIC /* "MZ
24 .org 0x8
25 .dword _kernel_entry /* Ker
26 .dword _kernel_asize /* Ker
27 .quad PHYS_LINK_KADDR /* Ker
28 .org 0x38 /* 0x2
29 .long LINUX_PE_MAGIC
30 .long pe_header - _head /* Off
31
32 pe_header:
33 __EFI_PE_HEADER
34
35 SYM_DATA(kernel_asize, .long _kernel_asize);
36 SYM_DATA(kernel_fsize, .long _kernel_fsize);
37
38 #endif
39
40 __REF
41
42 .align 12
43
44 SYM_CODE_START(kernel_entry)
45
46 /* Config direct window and set PG */
47 SETUP_DMWINS t0
48 JUMP_VIRT_ADDR t0, t1
49
50 /* Enable PG */
51 li.w t0, 0xb0
52 csrwr t0, LOONGARCH_CSR_CRMD
53 li.w t0, 0x04
54 csrwr t0, LOONGARCH_CSR_PRMD
55 li.w t0, 0x00
56 csrwr t0, LOONGARCH_CSR_EUEN
57
58 la.pcrel t0, __bss_start
59 st.d zero, t0, 0
60 la.pcrel t1, __bss_stop - LONGS
61 1:
62 addi.d t0, t0, LONGSIZE
63 st.d zero, t0, 0
64 bne t0, t1, 1b
65
66 la.pcrel t0, fw_arg0
67 st.d a0, t0, 0
68 la.pcrel t0, fw_arg1
69 st.d a1, t0, 0
70 la.pcrel t0, fw_arg2
71 st.d a2, t0, 0
72
73 #ifdef CONFIG_PAGE_SIZE_4KB
74 li.d t0, 0
75 li.d t1, CSR_STFILL
76 csrxchg t0, t1, LOONGARCH_CSR_
77 #endif
78 /* KSave3 used for percpu base, initia
79 csrwr zero, PERCPU_BASE_KS
80 /* GPR21 used for percpu base (runtime
81 move u0, zero
82
83 la.pcrel tp, init_thread_union
84 /* Set the SP after an empty pt_regs.
85 PTR_LI sp, (_THREAD_SIZE - PT
86 PTR_ADD sp, sp, tp
87 set_saved_sp sp, t0, t1
88
89 #ifdef CONFIG_RELOCATABLE
90
91 bl relocate_kernel
92
93 #ifdef CONFIG_RANDOMIZE_BASE
94 /* Repoint the sp into the new kernel
95 PTR_LI sp, (_THREAD_SIZE - PT
96 PTR_ADD sp, sp, tp
97 set_saved_sp sp, t0, t1
98
99 /* Jump to the new kernel: new_pc = cu
100 pcaddi t0, 0
101 add.d t0, t0, a0
102 jirl zero, t0, 0xc
103 #endif /* CONFIG_RANDOMIZE_BASE */
104
105 #endif /* CONFIG_RELOCATABLE */
106
107 #ifdef CONFIG_KASAN
108 bl kasan_early_init
109 #endif
110
111 bl start_kernel
112 ASM_BUG()
113
114 SYM_CODE_END(kernel_entry)
115
116 #ifdef CONFIG_SMP
117
118 /*
119 * SMP slave cpus entry point. Board specific
120 * function after setting up the stack and tp
121 */
122 SYM_CODE_START(smpboot_entry)
123
124 SETUP_DMWINS t0
125 JUMP_VIRT_ADDR t0, t1
126
127 #ifdef CONFIG_PAGE_SIZE_4KB
128 li.d t0, 0
129 li.d t1, CSR_STFILL
130 csrxchg t0, t1, LOONGARCH_CSR_
131 #endif
132 /* Enable PG */
133 li.w t0, 0xb0
134 csrwr t0, LOONGARCH_CSR_CRMD
135 li.w t0, 0x04
136 csrwr t0, LOONGARCH_CSR_PRMD
137 li.w t0, 0x00
138 csrwr t0, LOONGARCH_CSR_EUEN
139
140 la.pcrel t0, cpuboot_data
141 ld.d sp, t0, CPU_BOOT_STACK
142 ld.d tp, t0, CPU_BOOT_TINFO
143
144 bl start_secondary
145 ASM_BUG()
146
147 SYM_CODE_END(smpboot_entry)
148
149 #endif /* CONFIG_SMP */
150
151 SYM_ENTRY(kernel_entry_end, SYM_L_GLOBAL, SYM_
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