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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a80313ff91
With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* s390 (re)ipl support
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*
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* Copyright IBM Corp. 2007
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*/
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#ifndef _ASM_S390_IPL_H
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#define _ASM_S390_IPL_H
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#include <asm/lowcore.h>
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#include <asm/types.h>
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#include <asm/cio.h>
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#include <asm/setup.h>
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#include <uapi/asm/ipl.h>
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struct ipl_parameter_block {
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struct ipl_pl_hdr hdr;
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union {
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struct ipl_pb_hdr pb0_hdr;
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struct ipl_pb0_common common;
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struct ipl_pb0_fcp fcp;
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struct ipl_pb0_ccw ccw;
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char raw[PAGE_SIZE - sizeof(struct ipl_pl_hdr)];
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};
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} __packed __aligned(PAGE_SIZE);
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#define NSS_NAME_SIZE 8
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#define IPL_BP_FCP_LEN (sizeof(struct ipl_pl_hdr) + \
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sizeof(struct ipl_pb0_fcp))
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#define IPL_BP0_FCP_LEN (sizeof(struct ipl_pb0_fcp))
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#define IPL_BP_CCW_LEN (sizeof(struct ipl_pl_hdr) + \
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sizeof(struct ipl_pb0_ccw))
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#define IPL_BP0_CCW_LEN (sizeof(struct ipl_pb0_ccw))
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#define IPL_MAX_SUPPORTED_VERSION (0)
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#define IPL_RB_CERT_UNKNOWN ((unsigned short)-1)
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#define DIAG308_VMPARM_SIZE (64)
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#define DIAG308_SCPDATA_OFFSET offsetof(struct ipl_parameter_block, \
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fcp.scp_data)
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#define DIAG308_SCPDATA_SIZE (PAGE_SIZE - DIAG308_SCPDATA_OFFSET)
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struct save_area;
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struct save_area * __init save_area_alloc(bool is_boot_cpu);
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struct save_area * __init save_area_boot_cpu(void);
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void __init save_area_add_regs(struct save_area *, void *regs);
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void __init save_area_add_vxrs(struct save_area *, __vector128 *vxrs);
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extern void s390_reset_system(void);
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extern size_t ipl_block_get_ascii_vmparm(char *dest, size_t size,
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const struct ipl_parameter_block *ipb);
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enum ipl_type {
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IPL_TYPE_UNKNOWN = 1,
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IPL_TYPE_CCW = 2,
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IPL_TYPE_FCP = 4,
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IPL_TYPE_FCP_DUMP = 8,
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IPL_TYPE_NSS = 16,
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};
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struct ipl_info
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{
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enum ipl_type type;
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union {
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struct {
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struct ccw_dev_id dev_id;
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} ccw;
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struct {
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struct ccw_dev_id dev_id;
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u64 wwpn;
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u64 lun;
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} fcp;
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struct {
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char name[NSS_NAME_SIZE + 1];
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} nss;
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} data;
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};
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extern struct ipl_info ipl_info;
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extern void setup_ipl(void);
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extern void set_os_info_reipl_block(void);
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struct ipl_report {
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struct ipl_parameter_block *ipib;
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struct list_head components;
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struct list_head certificates;
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size_t size;
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};
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struct ipl_report_component {
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struct list_head list;
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struct ipl_rb_component_entry entry;
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};
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struct ipl_report_certificate {
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struct list_head list;
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struct ipl_rb_certificate_entry entry;
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void *key;
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};
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struct kexec_buf;
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struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib);
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void *ipl_report_finish(struct ipl_report *report);
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int ipl_report_free(struct ipl_report *report);
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int ipl_report_add_component(struct ipl_report *report, struct kexec_buf *kbuf,
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unsigned char flags, unsigned short cert);
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int ipl_report_add_certificate(struct ipl_report *report, void *key,
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unsigned long addr, unsigned long len);
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/*
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* DIAG 308 support
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*/
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enum diag308_subcode {
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DIAG308_REL_HSA = 2,
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DIAG308_LOAD_CLEAR = 3,
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DIAG308_LOAD_NORMAL_DUMP = 4,
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DIAG308_SET = 5,
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DIAG308_STORE = 6,
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};
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enum diag308_rc {
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DIAG308_RC_OK = 0x0001,
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DIAG308_RC_NOCONFIG = 0x0102,
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};
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extern int diag308(unsigned long subcode, void *addr);
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extern void store_status(void (*fn)(void *), void *data);
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extern void lgr_info_log(void);
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#endif /* _ASM_S390_IPL_H */
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