diff options
Diffstat (limited to 'arch/s390/kernel/als.c')
-rw-r--r-- | arch/s390/kernel/als.c | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/arch/s390/kernel/als.c b/arch/s390/kernel/als.c deleted file mode 100644 index d1892bf36cab..000000000000 --- a/arch/s390/kernel/als.c +++ /dev/null @@ -1,128 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright IBM Corp. 2016 - */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <asm/processor.h> -#include <asm/facility.h> -#include <asm/lowcore.h> -#include <asm/sclp.h> -#include "entry.h" - -/* - * The code within this file will be called very early. It may _not_ - * access anything within the bss section, since that is not cleared - * yet and may contain data (e.g. initrd) that must be saved by other - * code. - * For temporary objects the stack (16k) should be used. - */ - -static unsigned long als[] __initdata = { FACILITIES_ALS }; - -static void __init u16_to_hex(char *str, u16 val) -{ - int i, num; - - for (i = 1; i <= 4; i++) { - num = (val >> (16 - 4 * i)) & 0xf; - if (num >= 10) - num += 7; - *str++ = '0' + num; - } - *str = '\0'; -} - -static void __init print_machine_type(void) -{ - static char mach_str[80] __initdata = "Detected machine-type number: "; - char type_str[5]; - struct cpuid id; - - get_cpu_id(&id); - u16_to_hex(type_str, id.machine); - strcat(mach_str, type_str); - strcat(mach_str, "\n"); - sclp_early_printk(mach_str); -} - -static void __init u16_to_decimal(char *str, u16 val) -{ - int div = 1; - - while (div * 10 <= val) - div *= 10; - while (div) { - *str++ = '0' + val / div; - val %= div; - div /= 10; - } - *str = '\0'; -} - -static void __init print_missing_facilities(void) -{ - static char als_str[80] __initdata = "Missing facilities: "; - unsigned long val; - char val_str[6]; - int i, j, first; - - first = 1; - for (i = 0; i < ARRAY_SIZE(als); i++) { - val = ~S390_lowcore.stfle_fac_list[i] & als[i]; - for (j = 0; j < BITS_PER_LONG; j++) { - if (!(val & (1UL << (BITS_PER_LONG - 1 - j)))) - continue; - if (!first) - strcat(als_str, ","); - /* - * Make sure we stay within one line. Consider that - * each facility bit adds up to five characters and - * z/VM adds a four character prefix. - */ - if (strlen(als_str) > 70) { - strcat(als_str, "\n"); - sclp_early_printk(als_str); - *als_str = '\0'; - } - u16_to_decimal(val_str, i * BITS_PER_LONG + j); - strcat(als_str, val_str); - first = 0; - } - } - strcat(als_str, "\n"); - sclp_early_printk(als_str); - sclp_early_printk("See Principles of Operations for facility bits\n"); -} - -static void __init facility_mismatch(void) -{ - sclp_early_printk("The Linux kernel requires more recent processor hardware\n"); - print_machine_type(); - print_missing_facilities(); - disabled_wait(0x8badcccc); -} - -void __init verify_facilities(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(S390_lowcore.stfle_fac_list); i++) - S390_lowcore.stfle_fac_list[i] = 0; - asm volatile( - " stfl 0(0)\n" - : "=m" (S390_lowcore.stfl_fac_list)); - S390_lowcore.stfle_fac_list[0] = (u64)S390_lowcore.stfl_fac_list << 32; - if (S390_lowcore.stfl_fac_list & 0x01000000) { - register unsigned long reg0 asm("0") = ARRAY_SIZE(als) - 1; - - asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ - : "+d" (reg0) - : "a" (&S390_lowcore.stfle_fac_list) - : "memory", "cc"); - } - for (i = 0; i < ARRAY_SIZE(als); i++) { - if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) - facility_mismatch(); - } -} |