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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e3f12a5304
This fixes the problem that "init=" options may not be passed to kernel
correctly.
parse_mem_cmdline() of mn10300 arch gets rid of "mem=" string from
redboot_command_line. Then init_setup() parses the "init=" options from
static_command_line, which is a copy of redboot_command_line, and keeps
the pointer to the init options in execute_command variable.
Since the commit 026cee0 upstream (params: <level>_initcall-like kernel
parameters), static_command_line becomes overwritten by saved_command_line at
do_initcall_level(). Notice that saved_command_line is a command line
which includes "mem=" string.
As a result, execute_command may point to weird string by the length of
"mem=" parameter.
I noticed this problem when using the command line like this:
mem=128M console=ttyS0,115200 init=/bin/sh
Here is the processing flow of command line parameters.
start_kernel()
setup_arch(&command_line)
parse_mem_cmdline(cmdline_p)
* strcpy(boot_command_line, redboot_command_line);
* Remove "mem=xxx" from redboot_command_line.
* *cmdline_p = redboot_command_line;
setup_command_line(command_line) <-- command_line is redboot_command_line
* strcpy(saved_command_line, boot_command_line)
* strcpy(static_command_line, command_line)
parse_early_param()
strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
parse_early_options(tmp_cmdline);
parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
parse_args("Booting ..", static_command_line, ...);
init_setup() <-- save the pointer in execute_command
rest_init()
kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
At this point, execute_command points to "/bin/sh" string.
kernel_init()
kernel_init_freeable()
do_basic_setup()
do_initcalls()
do_initcall_level()
(*) strcpy(static_command_line, saved_command_line);
Here, execute_command gets to point to "200" string !!
Signed-off-by: David Howells <dhowells@redhat.com>
287 lines
6.7 KiB
C
287 lines
6.7 KiB
C
/* MN10300 Arch-specific initialisation
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <linux/cpu.h>
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#include <asm/processor.h>
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#include <linux/console.h>
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#include <asm/uaccess.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <proc/proc.h>
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#include <asm/fpu.h>
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#include <asm/sections.h>
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struct mn10300_cpuinfo boot_cpu_data;
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/* For PCI or other memory-mapped resources */
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unsigned long pci_mem_start = 0x18000000;
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static char __initdata cmd_line[COMMAND_LINE_SIZE];
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char redboot_command_line[COMMAND_LINE_SIZE] =
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"console=ttyS0,115200 root=/dev/mtdblock3 rw";
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char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
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static struct resource code_resource = {
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.start = 0x100000,
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.end = 0,
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.name = "Kernel code",
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};
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static struct resource data_resource = {
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.start = 0,
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.end = 0,
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.name = "Kernel data",
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};
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static unsigned long __initdata phys_memory_base;
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static unsigned long __initdata phys_memory_end;
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static unsigned long __initdata memory_end;
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unsigned long memory_size;
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struct thread_info *__current_ti = &init_thread_union.thread_info;
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struct task_struct *__current = &init_task;
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#define mn10300_known_cpus 5
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static const char *const mn10300_cputypes[] = {
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"am33-1",
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"am33-2",
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"am34-1",
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"am33-3",
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"am34-2",
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"unknown"
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};
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/*
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* Pick out the memory size. We look for mem=size,
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* where size is "size[KkMm]"
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*/
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static int __init early_mem(char *p)
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{
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memory_size = memparse(p, &p);
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if (memory_size == 0)
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panic("Memory size not known\n");
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return 0;
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}
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early_param("mem", early_mem);
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/*
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* architecture specific setup
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*/
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void __init setup_arch(char **cmdline_p)
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{
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unsigned long bootmap_size;
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unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
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cpu_init();
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unit_setup();
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smp_init_cpus();
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/* save unparsed command line copy for /proc/cmdline */
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strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
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/* populate cmd_line too for later use, preserving boot_command_line */
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strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
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*cmdline_p = cmd_line;
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parse_early_param();
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memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
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memory_size;
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if (memory_end > phys_memory_end)
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memory_end = phys_memory_end;
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init_mm.start_code = (unsigned long)&_text;
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init_mm.end_code = (unsigned long) &_etext;
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init_mm.end_data = (unsigned long) &_edata;
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init_mm.brk = (unsigned long) &_end;
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code_resource.start = virt_to_bus(&_text);
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code_resource.end = virt_to_bus(&_etext)-1;
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data_resource.start = virt_to_bus(&_etext);
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data_resource.end = virt_to_bus(&_edata)-1;
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start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
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kstart_pfn = PFN_UP(__pa(&_text));
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free_pfn = PFN_UP(__pa(&_end));
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end_pfn = PFN_DOWN(__pa(memory_end));
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bootmap_size = init_bootmem_node(&contig_page_data,
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free_pfn,
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start_pfn,
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end_pfn);
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if (kstart_pfn > start_pfn)
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free_bootmem(PFN_PHYS(start_pfn),
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PFN_PHYS(kstart_pfn - start_pfn));
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free_bootmem(PFN_PHYS(free_pfn),
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PFN_PHYS(end_pfn - free_pfn));
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/* If interrupt vector table is in main ram, then we need to
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reserve the page it is occupying. */
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if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
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CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
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reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
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BOOTMEM_DEFAULT);
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reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
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BOOTMEM_DEFAULT);
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#ifdef CONFIG_VT
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#if defined(CONFIG_VGA_CONSOLE)
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conswitchp = &vga_con;
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#elif defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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#endif
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paging_init();
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}
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/*
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* perform CPU initialisation
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*/
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void __init cpu_init(void)
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{
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unsigned long cpurev = CPUREV, type;
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type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
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if (type > mn10300_known_cpus)
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type = mn10300_known_cpus;
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printk(KERN_INFO "Panasonic %s, rev %ld\n",
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mn10300_cputypes[type],
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(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
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get_mem_info(&phys_memory_base, &memory_size);
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phys_memory_end = phys_memory_base + memory_size;
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fpu_init_state();
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}
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static struct cpu cpu_devices[NR_CPUS];
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static int __init topology_init(void)
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{
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int i;
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for_each_present_cpu(i)
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register_cpu(&cpu_devices[i], i);
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return 0;
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}
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subsys_initcall(topology_init);
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/*
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* Get CPU information for use by the procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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#ifdef CONFIG_SMP
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struct mn10300_cpuinfo *c = v;
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unsigned long cpu_id = c - cpu_data;
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unsigned long cpurev = c->type, type, icachesz, dcachesz;
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#else /* CONFIG_SMP */
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unsigned long cpu_id = 0;
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unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_SMP
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if (!cpu_online(cpu_id))
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return 0;
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#endif
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type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
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if (type > mn10300_known_cpus)
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type = mn10300_known_cpus;
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icachesz =
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((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) *
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((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
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1024;
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dcachesz =
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((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) *
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((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
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1024;
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seq_printf(m,
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"processor : %ld\n"
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"vendor_id : " PROCESSOR_VENDOR_NAME "\n"
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"cpu core : %s\n"
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"cpu rev : %lu\n"
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"model name : " PROCESSOR_MODEL_NAME "\n"
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"icache size: %lu\n"
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"dcache size: %lu\n",
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cpu_id,
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mn10300_cputypes[type],
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(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
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icachesz,
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dcachesz
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);
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seq_printf(m,
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"ioclk speed: %lu.%02luMHz\n"
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"bogomips : %lu.%02lu\n\n",
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MN10300_IOCLK / 1000000,
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(MN10300_IOCLK / 10000) % 100,
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#ifdef CONFIG_SMP
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c->loops_per_jiffy / (500000 / HZ),
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(c->loops_per_jiffy / (5000 / HZ)) % 100
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#else /* CONFIG_SMP */
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loops_per_jiffy / (500000 / HZ),
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(loops_per_jiffy / (5000 / HZ)) % 100
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#endif /* CONFIG_SMP */
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);
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < NR_CPUS ? cpu_data + *pos : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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