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259 lines · 6.6 KiB

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007, 2009
4 * Author(s): Hongjie Yang <[email protected]>,
5 */
6
7#define pr_fmt(fmt) "setup: " fmt
8
9#include <linux/sched/debug.h>
10#include <linux/cpufeature.h>
11#include <linux/compiler.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/ctype.h>
16#include <linux/lockdep.h>
17#include <linux/extable.h>
18#include <linux/pfn.h>
19#include <linux/uaccess.h>
20#include <linux/kernel.h>
21#include <asm/asm-extable.h>
22#include <linux/memblock.h>
23#include <linux/kasan.h>
24#include <asm/access-regs.h>
25#include <asm/asm-offsets.h>
26#include <asm/machine.h>
27#include <asm/diag.h>
28#include <asm/ebcdic.h>
29#include <asm/fpu.h>
30#include <asm/ipl.h>
31#include <asm/lowcore.h>
32#include <asm/processor.h>
33#include <asm/sections.h>
34#include <asm/setup.h>
35#include <asm/sysinfo.h>
36#include <asm/cpcmd.h>
37#include <asm/sclp.h>
38#include <asm/facility.h>
39#include <asm/boot_data.h>
40#include "entry.h"
41
42#define __decompressor_handled_param(func, param) \
43static int __init ignore_decompressor_param_##func(char *s) \
44{ \
45 return 0; \
46} \
47early_param(#param, ignore_decompressor_param_##func)
48
49#define decompressor_handled_param(param) __decompressor_handled_param(param, param)
50
51decompressor_handled_param(mem);
52decompressor_handled_param(vmalloc);
53decompressor_handled_param(dfltcc);
54decompressor_handled_param(facilities);
55decompressor_handled_param(nokaslr);
56decompressor_handled_param(cmma);
57decompressor_handled_param(relocate_lowcore);
58decompressor_handled_param(bootdebug);
59__decompressor_handled_param(debug_alternative, debug-alternative);
60#if IS_ENABLED(CONFIG_KVM)
61decompressor_handled_param(prot_virt);
62#endif
63
64static void __init kasan_early_init(void)
65{
66#ifdef CONFIG_KASAN
67 init_task.kasan_depth = 0;
68 kasan_init_generic();
69#endif
70}
71
72/*
73 * Initialize storage key for kernel pages
74 */
75static noinline __init void init_kernel_storage_key(void)
76{
77#if PAGE_DEFAULT_KEY
78 unsigned long end_pfn, init_pfn;
79
80 end_pfn = PFN_UP(__pa(_end));
81
82 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
83 page_set_storage_key(init_pfn << PAGE_SHIFT,
84 PAGE_DEFAULT_KEY, 0);
85#endif
86}
87
88static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
89
90/* Remove leading, trailing and double whitespace. */
91static inline void strim_all(char *str)
92{
93 char *s;
94
95 s = strim(str);
96 if (s != str)
97 memmove(str, s, strlen(s));
98 while (*str) {
99 if (!isspace(*str++))
100 continue;
101 if (isspace(*str)) {
102 s = skip_spaces(str);
103 memmove(str, s, strlen(s) + 1);
104 }
105 }
106}
107
108char arch_hw_string[128];
109
110static noinline __init void setup_arch_string(void)
111{
112 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
113 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
114 char mstr[80], hvstr[17];
115
116 if (stsi(mach, 1, 1, 1))
117 return;
118 EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
119 EBCASC(mach->type, sizeof(mach->type));
120 EBCASC(mach->model, sizeof(mach->model));
121 EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
122 scnprintf(mstr, sizeof(mstr), "%-16.16s %-4.4s %-16.16s %-16.16s",
123 mach->manufacturer, mach->type,
124 mach->model, mach->model_capacity);
125 strim_all(mstr);
126 if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
127 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
128 scnprintf(hvstr, sizeof(hvstr), "%-16.16s", vm->vm[0].cpi);
129 strim_all(hvstr);
130 } else {
131 scnprintf(hvstr, sizeof(hvstr), "%s",
132 machine_is_lpar() ? "LPAR" :
133 machine_is_vm() ? "z/VM" :
134 machine_is_kvm() ? "KVM" : "unknown");
135 }
136 scnprintf(arch_hw_string, sizeof(arch_hw_string), "HW: %s (%s)", mstr, hvstr);
137 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
138}
139
140static __init void setup_topology(void)
141{
142 int max_mnest;
143
144 if (!cpu_has_topology())
145 return;
146 for (max_mnest = 6; max_mnest > 1; max_mnest--) {
147 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
148 break;
149 }
150 topology_max_mnest = max_mnest;
151}
152
153void __init __do_early_pgm_check(struct pt_regs *regs)
154{
155 struct lowcore *lc = get_lowcore();
156
157 regs->flags = 0;
158 regs->int_code = lc->pgm_int_code;
159 regs->int_parm_long = lc->trans_exc_code;
160 regs->last_break = lc->pgm_last_break;
161 regs->monitor_code = lc->monitor_code;
162 set_pt_regs_flag(regs, PIF_PGM_CHECK);
163
164 /* Monitor Event? Might be a warning */
165 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) {
166 enum bug_trap_type btt;
167 unsigned long ip;
168
169 if (regs->monitor_code == MONCODE_BUG_ARG) {
170 regs->psw.addr = regs->gprs[14];
171 set_pt_regs_flag(regs, PIF_WARN_TRAP_SKIPPED);
172 btt = report_bug_entry((struct bug_entry *)regs->gprs[2], regs);
173 } else {
174 ip = __rewind_psw(regs->psw, regs->int_code >> 16);
175 btt = report_bug(ip, regs);
176 }
177 if (btt == BUG_TRAP_TYPE_WARN)
178 return;
179 }
180 if (fixup_exception(regs))
181 return;
182 /*
183 * Unhandled exception - system cannot continue but try to get some
184 * helpful messages to the console. Use early_printk() to print
185 * some basic information in case it is too early for printk().
186 */
187 register_early_console();
188 if (test_pt_regs_flag(regs, PIF_WARN_TRAP_SKIPPED))
189 early_printk("PANIC: early exception PSW: %016lx %016lx\n",
190 regs->psw.mask, regs->psw.addr);
191 else
192 early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n",
193 regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr);
194 show_regs(regs);
195 disabled_wait();
196}
197
198static noinline __init void setup_lowcore_early(void)
199{
200 struct lowcore *lc = get_lowcore();
201 psw_t psw;
202
203 psw.addr = (unsigned long)early_pgm_check_handler;
204 psw.mask = PSW_KERNEL_BITS;
205 lc->program_new_psw = psw;
206 lc->preempt_count = INIT_PREEMPT_COUNT;
207 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
208 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
209}
210
211static inline void save_vector_registers(void)
212{
213#ifdef CONFIG_CRASH_DUMP
214 if (cpu_has_vx())
215 save_vx_regs(boot_cpu_vector_save_area);
216#endif
217}
218
219static inline void setup_low_address_protection(void)
220{
221 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT);
222}
223
224static inline void setup_access_registers(void)
225{
226 unsigned int acrs[NUM_ACRS] = { 0 };
227
228 restore_access_regs(acrs);
229}
230
231char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
232static void __init setup_boot_command_line(void)
233{
234 /* copy arch command line */
235 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
236}
237
238static void __init sort_amode31_extable(void)
239{
240 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
241}
242
243void __init startup_init(void)
244{
245 kasan_early_init();
246 time_early_init();
247 init_kernel_storage_key();
248 lockdep_off();
249 sort_amode31_extable();
250 setup_lowcore_early();
251 setup_arch_string();
252 setup_boot_command_line();
253 save_vector_registers();
254 setup_topology();
255 sclp_early_detect();
256 setup_low_address_protection();
257 setup_access_registers();
258 lockdep_on();
259}