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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/s390/kernel/early.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/kernel/early.c')
-rw-r--r--arch/s390/kernel/early.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
new file mode 100644
index 000000000..9693c8630
--- /dev/null
+++ b/arch/s390/kernel/early.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2007, 2009
+ * Author(s): Hongjie Yang <hongjie@us.ibm.com>,
+ */
+
+#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();
+}