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318 lines
8.1 KiB
318 lines
8.1 KiB
// 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 <[email protected]>, |
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* Heiko Carstens <[email protected]> |
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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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