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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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5ecb2da660
Currently s390 supports a fixed maximum command line length of 896 bytes. This isn't enough as some installers are trying to pass all configuration data via kernel command line, and even with zfcp alone it is easy to generate really long command lines. Therefore extend the command line to 4 kbytes. In the parm area where the command line is stored there is no indication of the maximum allowed length, so a new field which contains the maximum length is added. The parm area has always been initialized to zero, so with old kernels this field would read zero. This is important because tools like zipl could read this field. If it contains a number larger than zero zipl knows the maximum length that can be stored in the parm area, otherwise it must assume that it is booting a legacy kernel and only 896 bytes are available. The removing of trailing whitespace in head.S is also removed because code to do this is already present in setup_boot_command_line(). Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
318 lines
8.1 KiB
C
318 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2007, 2009
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* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#define KMSG_COMPONENT "setup"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/lockdep.h>
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#include <linux/extable.h>
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#include <linux/pfn.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <asm/diag.h>
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#include <asm/ebcdic.h>
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#include <asm/ipl.h>
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#include <asm/lowcore.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sysinfo.h>
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#include <asm/cpcmd.h>
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#include <asm/sclp.h>
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#include <asm/facility.h>
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#include <asm/boot_data.h>
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#include <asm/switch_to.h>
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#include "entry.h"
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int __bootdata(is_full_image);
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static void __init reset_tod_clock(void)
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{
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union tod_clock clk;
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if (store_tod_clock_ext_cc(&clk) == 0)
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return;
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/* TOD clock not running. Set the clock to Unix Epoch. */
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if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
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disabled_wait();
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memset(&tod_clock_base, 0, sizeof(tod_clock_base));
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tod_clock_base.tod = TOD_UNIX_EPOCH;
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S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
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}
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/*
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* Initialize storage key for kernel pages
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*/
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static noinline __init void init_kernel_storage_key(void)
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{
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#if PAGE_DEFAULT_KEY
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unsigned long end_pfn, init_pfn;
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end_pfn = PFN_UP(__pa(_end));
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for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
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page_set_storage_key(init_pfn << PAGE_SHIFT,
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PAGE_DEFAULT_KEY, 0);
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#endif
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}
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static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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static noinline __init void detect_machine_type(void)
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{
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struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
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/* Check current-configuration-level */
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if (stsi(NULL, 0, 0, 0) <= 2) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
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return;
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}
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/* Get virtual-machine cpu information. */
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if (stsi(vmms, 3, 2, 2) || !vmms->count)
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return;
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/* Detect known hypervisors */
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if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
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S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
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else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
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S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
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}
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/* Remove leading, trailing and double whitespace. */
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static inline void strim_all(char *str)
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{
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char *s;
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s = strim(str);
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if (s != str)
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memmove(str, s, strlen(s));
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while (*str) {
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if (!isspace(*str++))
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continue;
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if (isspace(*str)) {
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s = skip_spaces(str);
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memmove(str, s, strlen(s) + 1);
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}
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}
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}
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static noinline __init void setup_arch_string(void)
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{
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struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
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struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
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char mstr[80], hvstr[17];
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if (stsi(mach, 1, 1, 1))
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return;
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EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
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EBCASC(mach->type, sizeof(mach->type));
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EBCASC(mach->model, sizeof(mach->model));
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EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
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sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
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mach->manufacturer, mach->type,
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mach->model, mach->model_capacity);
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strim_all(mstr);
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if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
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EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
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sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
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strim_all(hvstr);
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} else {
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sprintf(hvstr, "%s",
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MACHINE_IS_LPAR ? "LPAR" :
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MACHINE_IS_VM ? "z/VM" :
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MACHINE_IS_KVM ? "KVM" : "unknown");
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}
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dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
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}
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static __init void setup_topology(void)
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{
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int max_mnest;
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if (!test_facility(11))
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return;
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S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
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for (max_mnest = 6; max_mnest > 1; max_mnest--) {
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if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
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break;
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}
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topology_max_mnest = max_mnest;
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}
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static void early_pgm_check_handler(void)
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{
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const struct exception_table_entry *fixup;
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unsigned long cr0, cr0_new;
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unsigned long addr;
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addr = S390_lowcore.program_old_psw.addr;
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fixup = s390_search_extables(addr);
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if (!fixup)
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disabled_wait();
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/* Disable low address protection before storing into lowcore. */
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__ctl_store(cr0, 0, 0);
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cr0_new = cr0 & ~(1UL << 28);
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__ctl_load(cr0_new, 0, 0);
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S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
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__ctl_load(cr0, 0, 0);
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}
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static noinline __init void setup_lowcore_early(void)
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{
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psw_t psw;
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psw.addr = (unsigned long)s390_base_pgm_handler;
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psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
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if (IS_ENABLED(CONFIG_KASAN))
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psw.mask |= PSW_MASK_DAT;
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S390_lowcore.program_new_psw = psw;
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s390_base_pgm_handler_fn = early_pgm_check_handler;
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S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
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}
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static noinline __init void setup_facility_list(void)
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{
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memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
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if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
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__clear_facility(82, alt_stfle_fac_list);
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}
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static __init void detect_diag9c(void)
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{
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unsigned int cpu_address;
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int rc;
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cpu_address = stap();
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diag_stat_inc(DIAG_STAT_X09C);
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asm volatile(
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" diag %2,0,0x9c\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
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}
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static __init void detect_machine_facilities(void)
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{
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if (test_facility(8)) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
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__ctl_set_bit(0, 23);
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}
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if (test_facility(78))
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S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
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if (test_facility(3))
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S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
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if (test_facility(50) && test_facility(73)) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
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__ctl_set_bit(0, 55);
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}
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if (test_facility(51))
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S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
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if (test_facility(129)) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
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__ctl_set_bit(0, 17);
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}
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if (test_facility(130) && !noexec_disabled) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
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__ctl_set_bit(0, 20);
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}
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if (test_facility(133))
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S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
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if (test_facility(139) && (tod_clock_base.tod >> 63)) {
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/* Enabled signed clock comparator comparisons */
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S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
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clock_comparator_max = -1ULL >> 1;
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__ctl_set_bit(0, 53);
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}
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if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
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/* the control bit is set during PCI initialization */
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}
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}
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static inline void save_vector_registers(void)
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{
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#ifdef CONFIG_CRASH_DUMP
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if (test_facility(129))
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save_vx_regs(boot_cpu_vector_save_area);
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#endif
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}
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static inline void setup_control_registers(void)
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{
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unsigned long reg;
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__ctl_store(reg, 0, 0);
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reg |= CR0_LOW_ADDRESS_PROTECTION;
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reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
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reg |= CR0_EXTERNAL_CALL_SUBMASK;
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__ctl_load(reg, 0, 0);
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}
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static inline void setup_access_registers(void)
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{
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unsigned int acrs[NUM_ACRS] = { 0 };
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restore_access_regs(acrs);
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}
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static int __init disable_vector_extension(char *str)
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{
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S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
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__ctl_clear_bit(0, 17);
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return 0;
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}
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early_param("novx", disable_vector_extension);
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char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
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static void __init setup_boot_command_line(void)
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{
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/* copy arch command line */
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strlcpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
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}
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static void __init check_image_bootable(void)
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{
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if (is_full_image)
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return;
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sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
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sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
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sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
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disabled_wait();
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}
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void __init startup_init(void)
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{
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sclp_early_adjust_va();
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reset_tod_clock();
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check_image_bootable();
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time_early_init();
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init_kernel_storage_key();
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lockdep_off();
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setup_lowcore_early();
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setup_facility_list();
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detect_machine_type();
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setup_arch_string();
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setup_boot_command_line();
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detect_diag9c();
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detect_machine_facilities();
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save_vector_registers();
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setup_topology();
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sclp_early_detect();
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setup_control_registers();
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setup_access_registers();
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lockdep_on();
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}
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