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Since als.c is the part of the decompressor only, there is no point in using init sections for code and data. That's just creating extra sections in the decompressor image. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2016
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*/
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#include <linux/kernel.h>
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#include <asm/processor.h>
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#include <asm/facility.h>
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#include <asm/lowcore.h>
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#include <asm/sclp.h>
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/*
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* The code within this file will be called very early. It may _not_
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* access anything within the bss section, since that is not cleared
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* yet and may contain data (e.g. initrd) that must be saved by other
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* code.
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* For temporary objects the stack (16k) should be used.
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*/
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static unsigned long als[] = { FACILITIES_ALS };
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static void u16_to_hex(char *str, u16 val)
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{
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int i, num;
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for (i = 1; i <= 4; i++) {
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num = (val >> (16 - 4 * i)) & 0xf;
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if (num >= 10)
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num += 7;
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*str++ = '0' + num;
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}
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*str = '\0';
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}
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static void print_machine_type(void)
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{
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static char mach_str[80] = "Detected machine-type number: ";
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char type_str[5];
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struct cpuid id;
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get_cpu_id(&id);
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u16_to_hex(type_str, id.machine);
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strcat(mach_str, type_str);
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strcat(mach_str, "\n");
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sclp_early_printk(mach_str);
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}
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static void u16_to_decimal(char *str, u16 val)
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{
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int div = 1;
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while (div * 10 <= val)
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div *= 10;
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while (div) {
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*str++ = '0' + val / div;
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val %= div;
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div /= 10;
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}
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*str = '\0';
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}
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static void print_missing_facilities(void)
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{
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static char als_str[80] = "Missing facilities: ";
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unsigned long val;
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char val_str[6];
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int i, j, first;
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first = 1;
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for (i = 0; i < ARRAY_SIZE(als); i++) {
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val = ~S390_lowcore.stfle_fac_list[i] & als[i];
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for (j = 0; j < BITS_PER_LONG; j++) {
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if (!(val & (1UL << (BITS_PER_LONG - 1 - j))))
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continue;
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if (!first)
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strcat(als_str, ",");
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/*
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* Make sure we stay within one line. Consider that
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* each facility bit adds up to five characters and
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* z/VM adds a four character prefix.
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*/
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if (strlen(als_str) > 70) {
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strcat(als_str, "\n");
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sclp_early_printk(als_str);
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*als_str = '\0';
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}
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u16_to_decimal(val_str, i * BITS_PER_LONG + j);
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strcat(als_str, val_str);
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first = 0;
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}
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}
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strcat(als_str, "\n");
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sclp_early_printk(als_str);
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sclp_early_printk("See Principles of Operations for facility bits\n");
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}
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static void facility_mismatch(void)
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{
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sclp_early_printk("The Linux kernel requires more recent processor hardware\n");
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print_machine_type();
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print_missing_facilities();
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disabled_wait(0x8badcccc);
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}
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void verify_facilities(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(S390_lowcore.stfle_fac_list); i++)
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S390_lowcore.stfle_fac_list[i] = 0;
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asm volatile(
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" stfl 0(0)\n"
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: "=m" (S390_lowcore.stfl_fac_list));
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S390_lowcore.stfle_fac_list[0] = (u64)S390_lowcore.stfl_fac_list << 32;
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if (S390_lowcore.stfl_fac_list & 0x01000000) {
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register unsigned long reg0 asm("0") = ARRAY_SIZE(als) - 1;
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asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
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: "+d" (reg0)
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: "a" (&S390_lowcore.stfle_fac_list)
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: "memory", "cc");
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}
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for (i = 0; i < ARRAY_SIZE(als); i++) {
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if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i])
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facility_mismatch();
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}
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}
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