47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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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 <linux/init.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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#include "entry.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[] __initdata = { FACILITIES_ALS };
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void __init 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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continue;
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_sclp_print_early("The Linux kernel requires more recent processor hardware");
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disabled_wait(0x8badcccc);
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}
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}
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