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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b5e804598d
Add "facilities=" command line option which allows to override facility bits returned by stfle. The main purpose of that is debugging aids which allows to test specific kernel behaviour depending on specific facilities presence. It also affects CPU alternatives. "facilities=" command line option format is comma separated list of integer values to be additionally set or cleared (if value is starting with "!"). Values ranges are also supported. e.g.: facilities=!130-160,159,167-169 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>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/string.h>
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#include <asm/setup.h>
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#include <asm/sclp.h>
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#include "compressed/decompressor.h"
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#include "boot.h"
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extern char __boot_data_start[], __boot_data_end[];
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void error(char *x)
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{
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sclp_early_printk("\n\n");
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sclp_early_printk(x);
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sclp_early_printk("\n\n -- System halted");
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disabled_wait(0xdeadbeef);
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}
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#ifdef CONFIG_KERNEL_UNCOMPRESSED
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unsigned long mem_safe_offset(void)
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{
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return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
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}
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#endif
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static void rescue_initrd(void)
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{
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unsigned long min_initrd_addr;
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if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
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return;
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if (!INITRD_START || !INITRD_SIZE)
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return;
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min_initrd_addr = mem_safe_offset();
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if (min_initrd_addr <= INITRD_START)
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return;
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memmove((void *)min_initrd_addr, (void *)INITRD_START, INITRD_SIZE);
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INITRD_START = min_initrd_addr;
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}
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static void copy_bootdata(void)
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{
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if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
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error(".boot.data section size mismatch");
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memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
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}
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void startup_kernel(void)
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{
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void *img;
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rescue_initrd();
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sclp_early_read_info();
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store_ipl_parmblock();
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setup_boot_command_line();
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parse_boot_command_line();
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setup_memory_end();
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detect_memory();
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if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
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img = decompress_kernel();
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memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
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}
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copy_bootdata();
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vmlinux.entry();
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}
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