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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright IBM Corp. 2007, 2009
- * Author(s): Hongjie Yang <[email protected]>,
- */
- #define KMSG_COMPONENT "setup"
- #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
- #include <linux/compiler.h>
- #include <linux/init.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/ctype.h>
- #include <linux/lockdep.h>
- #include <linux/extable.h>
- #include <linux/pfn.h>
- #include <linux/uaccess.h>
- #include <linux/kernel.h>
- #include <asm/asm-extable.h>
- #include <asm/diag.h>
- #include <asm/ebcdic.h>
- #include <asm/ipl.h>
- #include <asm/lowcore.h>
- #include <asm/processor.h>
- #include <asm/sections.h>
- #include <asm/setup.h>
- #include <asm/sysinfo.h>
- #include <asm/cpcmd.h>
- #include <asm/sclp.h>
- #include <asm/facility.h>
- #include <asm/boot_data.h>
- #include <asm/switch_to.h>
- #include "entry.h"
- int __bootdata(is_full_image);
- static void __init reset_tod_clock(void)
- {
- union tod_clock clk;
- if (store_tod_clock_ext_cc(&clk) == 0)
- return;
- /* TOD clock not running. Set the clock to Unix Epoch. */
- if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk))
- disabled_wait();
- memset(&tod_clock_base, 0, sizeof(tod_clock_base));
- tod_clock_base.tod = TOD_UNIX_EPOCH;
- S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
- }
- /*
- * Initialize storage key for kernel pages
- */
- static noinline __init void init_kernel_storage_key(void)
- {
- #if PAGE_DEFAULT_KEY
- unsigned long end_pfn, init_pfn;
- end_pfn = PFN_UP(__pa(_end));
- for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
- page_set_storage_key(init_pfn << PAGE_SHIFT,
- PAGE_DEFAULT_KEY, 0);
- #endif
- }
- static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
- static noinline __init void detect_machine_type(void)
- {
- struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;
- /* Check current-configuration-level */
- if (stsi(NULL, 0, 0, 0) <= 2) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
- return;
- }
- /* Get virtual-machine cpu information. */
- if (stsi(vmms, 3, 2, 2) || !vmms->count)
- return;
- /* Detect known hypervisors */
- if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
- S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
- else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
- S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
- }
- /* Remove leading, trailing and double whitespace. */
- static inline void strim_all(char *str)
- {
- char *s;
- s = strim(str);
- if (s != str)
- memmove(str, s, strlen(s));
- while (*str) {
- if (!isspace(*str++))
- continue;
- if (isspace(*str)) {
- s = skip_spaces(str);
- memmove(str, s, strlen(s) + 1);
- }
- }
- }
- static noinline __init void setup_arch_string(void)
- {
- struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
- struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
- char mstr[80], hvstr[17];
- if (stsi(mach, 1, 1, 1))
- return;
- EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
- EBCASC(mach->type, sizeof(mach->type));
- EBCASC(mach->model, sizeof(mach->model));
- EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
- sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
- mach->manufacturer, mach->type,
- mach->model, mach->model_capacity);
- strim_all(mstr);
- if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
- EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
- sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
- strim_all(hvstr);
- } else {
- sprintf(hvstr, "%s",
- MACHINE_IS_LPAR ? "LPAR" :
- MACHINE_IS_VM ? "z/VM" :
- MACHINE_IS_KVM ? "KVM" : "unknown");
- }
- dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
- }
- static __init void setup_topology(void)
- {
- int max_mnest;
- if (!test_facility(11))
- return;
- S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
- for (max_mnest = 6; max_mnest > 1; max_mnest--) {
- if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
- break;
- }
- topology_max_mnest = max_mnest;
- }
- void __do_early_pgm_check(struct pt_regs *regs)
- {
- if (!fixup_exception(regs))
- disabled_wait();
- }
- static noinline __init void setup_lowcore_early(void)
- {
- psw_t psw;
- psw.addr = (unsigned long)early_pgm_check_handler;
- psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
- if (IS_ENABLED(CONFIG_KASAN))
- psw.mask |= PSW_MASK_DAT;
- S390_lowcore.program_new_psw = psw;
- S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
- }
- static noinline __init void setup_facility_list(void)
- {
- memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list));
- if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
- __clear_facility(82, alt_stfle_fac_list);
- }
- static __init void detect_diag9c(void)
- {
- unsigned int cpu_address;
- int rc;
- cpu_address = stap();
- diag_stat_inc(DIAG_STAT_X09C);
- asm volatile(
- " diag %2,0,0x9c\n"
- "0: la %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
- if (!rc)
- S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
- }
- static __init void detect_machine_facilities(void)
- {
- if (test_facility(8)) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
- __ctl_set_bit(0, 23);
- }
- if (test_facility(78))
- S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
- if (test_facility(3))
- S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
- if (test_facility(50) && test_facility(73)) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
- __ctl_set_bit(0, 55);
- }
- if (test_facility(51))
- S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
- if (test_facility(129)) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
- __ctl_set_bit(0, 17);
- }
- if (test_facility(130) && !noexec_disabled) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
- __ctl_set_bit(0, 20);
- }
- if (test_facility(133))
- S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
- if (test_facility(139) && (tod_clock_base.tod >> 63)) {
- /* Enabled signed clock comparator comparisons */
- S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
- clock_comparator_max = -1ULL >> 1;
- __ctl_set_bit(0, 53);
- }
- if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) {
- S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO;
- /* the control bit is set during PCI initialization */
- }
- }
- static inline void save_vector_registers(void)
- {
- #ifdef CONFIG_CRASH_DUMP
- if (test_facility(129))
- save_vx_regs(boot_cpu_vector_save_area);
- #endif
- }
- static inline void setup_control_registers(void)
- {
- unsigned long reg;
- __ctl_store(reg, 0, 0);
- reg |= CR0_LOW_ADDRESS_PROTECTION;
- reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
- reg |= CR0_EXTERNAL_CALL_SUBMASK;
- __ctl_load(reg, 0, 0);
- }
- static inline void setup_access_registers(void)
- {
- unsigned int acrs[NUM_ACRS] = { 0 };
- restore_access_regs(acrs);
- }
- static int __init disable_vector_extension(char *str)
- {
- S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
- __ctl_clear_bit(0, 17);
- return 0;
- }
- early_param("novx", disable_vector_extension);
- char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
- static void __init setup_boot_command_line(void)
- {
- /* copy arch command line */
- strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE);
- }
- static void __init check_image_bootable(void)
- {
- if (is_full_image)
- return;
- sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
- sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
- sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
- disabled_wait();
- }
- static void __init sort_amode31_extable(void)
- {
- sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table);
- }
- void __init startup_init(void)
- {
- reset_tod_clock();
- check_image_bootable();
- time_early_init();
- init_kernel_storage_key();
- lockdep_off();
- sort_amode31_extable();
- setup_lowcore_early();
- setup_facility_list();
- detect_machine_type();
- setup_arch_string();
- setup_boot_command_line();
- detect_diag9c();
- detect_machine_facilities();
- save_vector_registers();
- setup_topology();
- sclp_early_detect();
- setup_control_registers();
- setup_access_registers();
- lockdep_on();
- }
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