Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kmsg_dump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <as-layout.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <arch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <kern.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <kern_util.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <mem_user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define DEFAULT_COMMAND_LINE "root=98:0"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /* Changed in add_arg and setup_arch, which run before SMP is started */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static void __init add_arg(char *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		os_warn("add_arg: Too many command line arguments!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (strlen(command_line) > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		strcat(command_line, " ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	strcat(command_line, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * These fields are initialized at boot time and not changed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * XXX This structure is used only in the non-SMP case.  Maybe this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * should be moved to smp.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) struct cpuinfo_um boot_cpu_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	.loops_per_jiffy	= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	.ipi_pipe		= { -1, -1 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) union thread_union cpu0_irqstack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	__section(".data..init_irqstack") =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		{ .thread_info = INIT_THREAD_INFO(init_task) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) /* Changed in setup_arch, which is called in early boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static char host_info[(__NEW_UTS_LEN + 1) * 5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int show_cpuinfo(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	int index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	seq_printf(m, "processor\t: %d\n", index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	seq_printf(m, "vendor_id\t: User Mode Linux\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	seq_printf(m, "model name\t: UML\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	seq_printf(m, "mode\t\t: skas\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	seq_printf(m, "host\t\t: %s\n", host_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		   loops_per_jiffy/(500000/HZ),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		   (loops_per_jiffy/(5000/HZ)) % 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static void *c_start(struct seq_file *m, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static void *c_next(struct seq_file *m, void *v, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	++*pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	return c_start(m, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static void c_stop(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) const struct seq_operations cpuinfo_op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	.start	= c_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	.next	= c_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	.stop	= c_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	.show	= show_cpuinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) /* Set in linux_main */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unsigned long uml_physmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) EXPORT_SYMBOL(uml_physmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unsigned long uml_reserved; /* Also modified in mem_init */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) unsigned long start_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) unsigned long end_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Set in uml_ncpus_setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) int ncpus = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* Set in early boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int have_root __initdata = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Set in uml_mem_setup and modified in linux_main */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) long long physmem_size = 32 * 1024 * 1024;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) EXPORT_SYMBOL(physmem_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static const char *usage_string =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) "User Mode Linux v%s\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) "	available at http://user-mode-linux.sourceforge.net/\n\n";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int __init uml_version_setup(char *line, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	/* Explicitly use printf() to show version in stdout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	printf("%s\n", init_utsname()->release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) __uml_setup("--version", uml_version_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) "--version\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) "    Prints the version number of the kernel.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static int __init uml_root_setup(char *line, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	have_root = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) __uml_setup("root=", uml_root_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) "root=<file containing the root fs>\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) "    This is actually used by the generic kernel in exactly the same\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) "    way as in any other kernel. If you configure a number of block\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) "    devices and want to boot off something other than ubd0, you \n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) "    would use something like:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) "        root=/dev/ubd5\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static int __init no_skas_debug_setup(char *line, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	os_warn("'gdb linux'\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) __uml_setup("debug", no_skas_debug_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) "debug\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) "    this flag is not needed to run gdb on UML in skas mode\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static int __init Usage(char *line, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	const char **p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	printf(usage_string, init_utsname()->release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	p = &__uml_help_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	/* Explicitly use printf() to show help in stdout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	while (p < &__uml_help_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		printf("%s", *p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) __uml_setup("--help", Usage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) "--help\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) "    Prints this message.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static void __init uml_checksetup(char *line, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct uml_param *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	p = &__uml_setup_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	while (p < &__uml_setup_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		size_t n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		n = strlen(p->str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static void __init uml_postsetup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	initcall_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	p = &__uml_postsetup_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	while (p < &__uml_postsetup_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		(*p)();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int panic_exit(struct notifier_block *self, unsigned long unused1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		      void *unused2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	kmsg_dump(KMSG_DUMP_PANIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	bust_spinlocks(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	bust_spinlocks(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	uml_exitcode = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	os_dump_core();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static struct notifier_block panic_exit_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	.notifier_call 		= panic_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	.next 			= NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	.priority 		= 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) void uml_finishsetup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	atomic_notifier_chain_register(&panic_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 				       &panic_exit_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	uml_postsetup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	new_thread_handler();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* Set during early boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) unsigned long task_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) EXPORT_SYMBOL(task_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) unsigned long host_task_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) unsigned long brk_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unsigned long end_iomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) EXPORT_SYMBOL(end_iomem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) #define MIN_VMALLOC (32 * 1024 * 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int __init linux_main(int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	unsigned long avail, diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	unsigned long virtmem_size, max_physmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	unsigned long stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	int add;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	for (i = 1; i < argc; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		if ((i == 1) && (argv[i][0] == ' '))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		add = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		uml_checksetup(argv[i], &add);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		if (add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			add_arg(argv[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (have_root == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		add_arg(DEFAULT_COMMAND_LINE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	host_task_size = os_get_top_address();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	 * out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	task_size = host_task_size & PGDIR_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	/* OS sanity checks that need to happen before the kernel runs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	os_early_checks();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	brk_start = (unsigned long) sbrk(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	 * Increase physical memory size for exec-shield users
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	 * so they actually get what they asked for. This should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	 * add zero for non-exec shield users
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (diff > 1024 * 1024) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		os_info("Adding %ld bytes to physical memory to account for "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			"exec-shield gap\n", diff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	/* Reserve up to 4M after the current brk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	setup_machinename(init_utsname()->machine);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	highmem = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	 * Zones have to begin on a 1 << MAX_ORDER page boundary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	 * so this makes sure that's true for highmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (physmem_size + iomem_size > max_physmem) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		highmem = physmem_size + iomem_size - max_physmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		physmem_size -= highmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	high_physmem = uml_physmem + physmem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	end_iomem = high_physmem + iomem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	high_memory = (void *) end_iomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	start_vm = VMALLOC_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	virtmem_size = physmem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	stack = (unsigned long) argv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	stack &= ~(1024 * 1024 - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	avail = stack - start_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (physmem_size > avail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		virtmem_size = avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	end_vm = start_vm + virtmem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (virtmem_size < physmem_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		os_info("Kernel virtual memory size shrunk to %lu bytes\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			virtmem_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	os_flush_stdout();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	return start_uml();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int __init __weak read_initrd(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) void __init setup_arch(char **cmdline_p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	stack_protections((unsigned long) &init_thread_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	mem_total_pages(physmem_size, iomem_size, highmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	read_initrd();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	paging_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	*cmdline_p = command_line;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	setup_hostinfo(host_info, sizeof host_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) void __init check_bugs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	arch_check_bugs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	os_check_bugs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) void *text_poke(void *addr, const void *opcode, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	 * In UML, the only reference to this function is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	 * apply_relocate_add(), which shouldn't ever actually call this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	 * because UML doesn't have live patching.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	return memcpy(addr, opcode, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) void text_poke_sync(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }