This source file includes following definitions.
- error
- mem_safe_offset
- rescue_initrd
- copy_bootdata
- handle_relocs
- clear_bss_section
- startup_kernel
1
2 #include <linux/string.h>
3 #include <linux/elf.h>
4 #include <asm/sections.h>
5 #include <asm/setup.h>
6 #include <asm/kexec.h>
7 #include <asm/sclp.h>
8 #include <asm/diag.h>
9 #include <asm/uv.h>
10 #include "compressed/decompressor.h"
11 #include "boot.h"
12
13 extern char __boot_data_start[], __boot_data_end[];
14 extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
15 unsigned long __bootdata_preserved(__kaslr_offset);
16
17
18
19
20
21
22
23
24 extern char _sdma[], _edma[];
25 extern char _stext_dma[], _etext_dma[];
26 extern struct exception_table_entry _start_dma_ex_table[];
27 extern struct exception_table_entry _stop_dma_ex_table[];
28 unsigned long __bootdata_preserved(__sdma) = __pa(&_sdma);
29 unsigned long __bootdata_preserved(__edma) = __pa(&_edma);
30 unsigned long __bootdata_preserved(__stext_dma) = __pa(&_stext_dma);
31 unsigned long __bootdata_preserved(__etext_dma) = __pa(&_etext_dma);
32 struct exception_table_entry *
33 __bootdata_preserved(__start_dma_ex_table) = _start_dma_ex_table;
34 struct exception_table_entry *
35 __bootdata_preserved(__stop_dma_ex_table) = _stop_dma_ex_table;
36
37 int _diag210_dma(struct diag210 *addr);
38 int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode);
39 int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode);
40 void _diag0c_dma(struct hypfs_diag0c_entry *entry);
41 void _diag308_reset_dma(void);
42 struct diag_ops __bootdata_preserved(diag_dma_ops) = {
43 .diag210 = _diag210_dma,
44 .diag26c = _diag26c_dma,
45 .diag14 = _diag14_dma,
46 .diag0c = _diag0c_dma,
47 .diag308_reset = _diag308_reset_dma
48 };
49 static struct diag210 _diag210_tmp_dma __section(".dma.data");
50 struct diag210 *__bootdata_preserved(__diag210_tmp_dma) = &_diag210_tmp_dma;
51 void _swsusp_reset_dma(void);
52 unsigned long __bootdata_preserved(__swsusp_reset_dma) = __pa(_swsusp_reset_dma);
53
54 void error(char *x)
55 {
56 sclp_early_printk("\n\n");
57 sclp_early_printk(x);
58 sclp_early_printk("\n\n -- System halted");
59
60 disabled_wait();
61 }
62
63 #ifdef CONFIG_KERNEL_UNCOMPRESSED
64 unsigned long mem_safe_offset(void)
65 {
66 return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
67 }
68 #endif
69
70 static void rescue_initrd(unsigned long addr)
71 {
72 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
73 return;
74 if (!INITRD_START || !INITRD_SIZE)
75 return;
76 if (addr <= INITRD_START)
77 return;
78 memmove((void *)addr, (void *)INITRD_START, INITRD_SIZE);
79 INITRD_START = addr;
80 }
81
82 static void copy_bootdata(void)
83 {
84 if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
85 error(".boot.data section size mismatch");
86 memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
87 if (__boot_data_preserved_end - __boot_data_preserved_start != vmlinux.bootdata_preserved_size)
88 error(".boot.preserved.data section size mismatch");
89 memcpy((void *)vmlinux.bootdata_preserved_off, __boot_data_preserved_start, vmlinux.bootdata_preserved_size);
90 }
91
92 static void handle_relocs(unsigned long offset)
93 {
94 Elf64_Rela *rela_start, *rela_end, *rela;
95 int r_type, r_sym, rc;
96 Elf64_Addr loc, val;
97 Elf64_Sym *dynsym;
98
99 rela_start = (Elf64_Rela *) vmlinux.rela_dyn_start;
100 rela_end = (Elf64_Rela *) vmlinux.rela_dyn_end;
101 dynsym = (Elf64_Sym *) vmlinux.dynsym_start;
102 for (rela = rela_start; rela < rela_end; rela++) {
103 loc = rela->r_offset + offset;
104 val = rela->r_addend;
105 r_sym = ELF64_R_SYM(rela->r_info);
106 if (r_sym) {
107 if (dynsym[r_sym].st_shndx != SHN_UNDEF)
108 val += dynsym[r_sym].st_value + offset;
109 } else {
110
111
112
113
114 val += offset;
115 }
116 r_type = ELF64_R_TYPE(rela->r_info);
117 rc = arch_kexec_do_relocs(r_type, (void *) loc, val, 0);
118 if (rc)
119 error("Unknown relocation type");
120 }
121 }
122
123 static void clear_bss_section(void)
124 {
125 memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size);
126 }
127
128 void startup_kernel(void)
129 {
130 unsigned long random_lma;
131 unsigned long safe_addr;
132 void *img;
133
134 store_ipl_parmblock();
135 safe_addr = mem_safe_offset();
136 safe_addr = read_ipl_report(safe_addr);
137 uv_query_info();
138 rescue_initrd(safe_addr);
139 sclp_early_read_info();
140 setup_boot_command_line();
141 parse_boot_command_line();
142 setup_memory_end();
143 detect_memory();
144
145 random_lma = __kaslr_offset = 0;
146 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) {
147 random_lma = get_random_base(safe_addr);
148 if (random_lma) {
149 __kaslr_offset = random_lma - vmlinux.default_lma;
150 img = (void *)vmlinux.default_lma;
151 vmlinux.default_lma += __kaslr_offset;
152 vmlinux.entry += __kaslr_offset;
153 vmlinux.bootdata_off += __kaslr_offset;
154 vmlinux.bootdata_preserved_off += __kaslr_offset;
155 vmlinux.rela_dyn_start += __kaslr_offset;
156 vmlinux.rela_dyn_end += __kaslr_offset;
157 vmlinux.dynsym_start += __kaslr_offset;
158 }
159 }
160
161 if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
162 img = decompress_kernel();
163 memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
164 } else if (__kaslr_offset)
165 memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size);
166
167 clear_bss_section();
168 copy_bootdata();
169 if (IS_ENABLED(CONFIG_RELOCATABLE))
170 handle_relocs(__kaslr_offset);
171
172 if (__kaslr_offset) {
173
174
175
176
177 S390_lowcore.vmcore_info = __kaslr_offset | 0x1UL;
178
179 if (IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED))
180 memset(img, 0, vmlinux.image_size);
181 }
182 vmlinux.entry();
183 }