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Linux/arch/um/kernel/um_arch.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  4  */
  5 
  6 #include <linux/delay.h>
  7 #include <linux/init.h>
  8 #include <linux/mm.h>
  9 #include <linux/module.h>
 10 #include <linux/seq_file.h>
 11 #include <linux/string.h>
 12 #include <linux/utsname.h>
 13 #include <linux/sched.h>
 14 #include <linux/sched/task.h>
 15 #include <linux/kmsg_dump.h>
 16 
 17 #include <asm/pgtable.h>
 18 #include <asm/processor.h>
 19 #include <asm/sections.h>
 20 #include <asm/setup.h>
 21 #include <as-layout.h>
 22 #include <arch.h>
 23 #include <init.h>
 24 #include <kern.h>
 25 #include <kern_util.h>
 26 #include <mem_user.h>
 27 #include <os.h>
 28 
 29 #define DEFAULT_COMMAND_LINE "root=98:0"
 30 
 31 /* Changed in add_arg and setup_arch, which run before SMP is started */
 32 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
 33 
 34 static void __init add_arg(char *arg)
 35 {
 36         if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
 37                 os_warn("add_arg: Too many command line arguments!\n");
 38                 exit(1);
 39         }
 40         if (strlen(command_line) > 0)
 41                 strcat(command_line, " ");
 42         strcat(command_line, arg);
 43 }
 44 
 45 /*
 46  * These fields are initialized at boot time and not changed.
 47  * XXX This structure is used only in the non-SMP case.  Maybe this
 48  * should be moved to smp.c.
 49  */
 50 struct cpuinfo_um boot_cpu_data = {
 51         .loops_per_jiffy        = 0,
 52         .ipi_pipe               = { -1, -1 }
 53 };
 54 
 55 union thread_union cpu0_irqstack
 56         __attribute__((__section__(".data..init_irqstack"))) =
 57                 { .thread_info = INIT_THREAD_INFO(init_task) };
 58 
 59 /* Changed in setup_arch, which is called in early boot */
 60 static char host_info[(__NEW_UTS_LEN + 1) * 5];
 61 
 62 static int show_cpuinfo(struct seq_file *m, void *v)
 63 {
 64         int index = 0;
 65 
 66         seq_printf(m, "processor\t: %d\n", index);
 67         seq_printf(m, "vendor_id\t: User Mode Linux\n");
 68         seq_printf(m, "model name\t: UML\n");
 69         seq_printf(m, "mode\t\t: skas\n");
 70         seq_printf(m, "host\t\t: %s\n", host_info);
 71         seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
 72                    loops_per_jiffy/(500000/HZ),
 73                    (loops_per_jiffy/(5000/HZ)) % 100);
 74 
 75         return 0;
 76 }
 77 
 78 static void *c_start(struct seq_file *m, loff_t *pos)
 79 {
 80         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 81 }
 82 
 83 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 84 {
 85         ++*pos;
 86         return c_start(m, pos);
 87 }
 88 
 89 static void c_stop(struct seq_file *m, void *v)
 90 {
 91 }
 92 
 93 const struct seq_operations cpuinfo_op = {
 94         .start  = c_start,
 95         .next   = c_next,
 96         .stop   = c_stop,
 97         .show   = show_cpuinfo,
 98 };
 99 
100 /* Set in linux_main */
101 unsigned long uml_physmem;
102 EXPORT_SYMBOL(uml_physmem);
103 
104 unsigned long uml_reserved; /* Also modified in mem_init */
105 unsigned long start_vm;
106 unsigned long end_vm;
107 
108 /* Set in uml_ncpus_setup */
109 int ncpus = 1;
110 
111 /* Set in early boot */
112 static int have_root __initdata = 0;
113 
114 /* Set in uml_mem_setup and modified in linux_main */
115 long long physmem_size = 32 * 1024 * 1024;
116 EXPORT_SYMBOL(physmem_size);
117 
118 static const char *usage_string =
119 "User Mode Linux v%s\n"
120 "       available at http://user-mode-linux.sourceforge.net/\n\n";
121 
122 static int __init uml_version_setup(char *line, int *add)
123 {
124         /* Explicitly use printf() to show version in stdout */
125         printf("%s\n", init_utsname()->release);
126         exit(0);
127 
128         return 0;
129 }
130 
131 __uml_setup("--version", uml_version_setup,
132 "--version\n"
133 "    Prints the version number of the kernel.\n\n"
134 );
135 
136 static int __init uml_root_setup(char *line, int *add)
137 {
138         have_root = 1;
139         return 0;
140 }
141 
142 __uml_setup("root=", uml_root_setup,
143 "root=<file containing the root fs>\n"
144 "    This is actually used by the generic kernel in exactly the same\n"
145 "    way as in any other kernel. If you configure a number of block\n"
146 "    devices and want to boot off something other than ubd0, you \n"
147 "    would use something like:\n"
148 "        root=/dev/ubd5\n\n"
149 );
150 
151 static int __init no_skas_debug_setup(char *line, int *add)
152 {
153         os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
154         os_warn("'gdb linux'\n");
155 
156         return 0;
157 }
158 
159 __uml_setup("debug", no_skas_debug_setup,
160 "debug\n"
161 "    this flag is not needed to run gdb on UML in skas mode\n\n"
162 );
163 
164 static int __init Usage(char *line, int *add)
165 {
166         const char **p;
167 
168         printf(usage_string, init_utsname()->release);
169         p = &__uml_help_start;
170         /* Explicitly use printf() to show help in stdout */
171         while (p < &__uml_help_end) {
172                 printf("%s", *p);
173                 p++;
174         }
175         exit(0);
176         return 0;
177 }
178 
179 __uml_setup("--help", Usage,
180 "--help\n"
181 "    Prints this message.\n\n"
182 );
183 
184 static void __init uml_checksetup(char *line, int *add)
185 {
186         struct uml_param *p;
187 
188         p = &__uml_setup_start;
189         while (p < &__uml_setup_end) {
190                 size_t n;
191 
192                 n = strlen(p->str);
193                 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
194                         return;
195                 p++;
196         }
197 }
198 
199 static void __init uml_postsetup(void)
200 {
201         initcall_t *p;
202 
203         p = &__uml_postsetup_start;
204         while (p < &__uml_postsetup_end) {
205                 (*p)();
206                 p++;
207         }
208         return;
209 }
210 
211 static int panic_exit(struct notifier_block *self, unsigned long unused1,
212                       void *unused2)
213 {
214         kmsg_dump(KMSG_DUMP_PANIC);
215         bust_spinlocks(1);
216         bust_spinlocks(0);
217         uml_exitcode = 1;
218         os_dump_core();
219         return 0;
220 }
221 
222 static struct notifier_block panic_exit_notifier = {
223         .notifier_call          = panic_exit,
224         .next                   = NULL,
225         .priority               = 0
226 };
227 
228 void uml_finishsetup(void)
229 {
230         atomic_notifier_chain_register(&panic_notifier_list,
231                                        &panic_exit_notifier);
232 
233         uml_postsetup();
234 
235         new_thread_handler();
236 }
237 
238 /* Set during early boot */
239 unsigned long task_size;
240 EXPORT_SYMBOL(task_size);
241 
242 unsigned long host_task_size;
243 
244 unsigned long brk_start;
245 unsigned long end_iomem;
246 EXPORT_SYMBOL(end_iomem);
247 
248 #define MIN_VMALLOC (32 * 1024 * 1024)
249 
250 int __init linux_main(int argc, char **argv)
251 {
252         unsigned long avail, diff;
253         unsigned long virtmem_size, max_physmem;
254         unsigned long stack;
255         unsigned int i;
256         int add;
257 
258         for (i = 1; i < argc; i++) {
259                 if ((i == 1) && (argv[i][0] == ' '))
260                         continue;
261                 add = 1;
262                 uml_checksetup(argv[i], &add);
263                 if (add)
264                         add_arg(argv[i]);
265         }
266         if (have_root == 0)
267                 add_arg(DEFAULT_COMMAND_LINE);
268 
269         host_task_size = os_get_top_address();
270         /*
271          * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
272          * out
273          */
274         task_size = host_task_size & PGDIR_MASK;
275 
276         /* OS sanity checks that need to happen before the kernel runs */
277         os_early_checks();
278 
279         brk_start = (unsigned long) sbrk(0);
280 
281         /*
282          * Increase physical memory size for exec-shield users
283          * so they actually get what they asked for. This should
284          * add zero for non-exec shield users
285          */
286 
287         diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
288         if (diff > 1024 * 1024) {
289                 os_info("Adding %ld bytes to physical memory to account for "
290                         "exec-shield gap\n", diff);
291                 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
292         }
293 
294         uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
295 
296         /* Reserve up to 4M after the current brk */
297         uml_reserved = ROUND_4M(brk_start) + (1 << 22);
298 
299         setup_machinename(init_utsname()->machine);
300 
301         highmem = 0;
302         iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
303         max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
304 
305         /*
306          * Zones have to begin on a 1 << MAX_ORDER page boundary,
307          * so this makes sure that's true for highmem
308          */
309         max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
310         if (physmem_size + iomem_size > max_physmem) {
311                 highmem = physmem_size + iomem_size - max_physmem;
312                 physmem_size -= highmem;
313         }
314 
315         high_physmem = uml_physmem + physmem_size;
316         end_iomem = high_physmem + iomem_size;
317         high_memory = (void *) end_iomem;
318 
319         start_vm = VMALLOC_START;
320 
321         virtmem_size = physmem_size;
322         stack = (unsigned long) argv;
323         stack &= ~(1024 * 1024 - 1);
324         avail = stack - start_vm;
325         if (physmem_size > avail)
326                 virtmem_size = avail;
327         end_vm = start_vm + virtmem_size;
328 
329         if (virtmem_size < physmem_size)
330                 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
331                         virtmem_size);
332 
333         os_flush_stdout();
334 
335         return start_uml();
336 }
337 
338 int __init __weak read_initrd(void)
339 {
340         return 0;
341 }
342 
343 void __init setup_arch(char **cmdline_p)
344 {
345         stack_protections((unsigned long) &init_thread_info);
346         setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
347         mem_total_pages(physmem_size, iomem_size, highmem);
348         read_initrd();
349 
350         paging_init();
351         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
352         *cmdline_p = command_line;
353         setup_hostinfo(host_info, sizeof host_info);
354 }
355 
356 void __init check_bugs(void)
357 {
358         arch_check_bugs();
359         os_check_bugs();
360 }
361 
362 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
363 {
364 }
365 

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