18f75582aSVasily Gorbik // SPDX-License-Identifier: GPL-2.0 28f75582aSVasily Gorbik #include <linux/string.h> 3805bc0bcSGerald Schaefer #include <linux/elf.h> 473045a08SVasily Gorbik #include <asm/boot_data.h> 5a80313ffSGerald Schaefer #include <asm/sections.h> 68e9205d2SAlexander Gordeev #include <asm/maccess.h> 7d7e7fbbaSVasily Gorbik #include <asm/cpu_mf.h> 815426ca4SVasily Gorbik #include <asm/setup.h> 90c4f2623SVasily Gorbik #include <asm/kasan.h> 10805bc0bcSGerald Schaefer #include <asm/kexec.h> 117516fc11SVasily Gorbik #include <asm/sclp.h> 12a80313ffSGerald Schaefer #include <asm/diag.h> 135abb9351SVasily Gorbik #include <asm/uv.h> 144df29d2bSAlexander Gordeev #include <asm/abs_lowcore.h> 15bb1520d5SAlexander Gordeev #include <asm/mem_detect.h> 16edd4a866SHeiko Carstens #include "decompressor.h" 178f75582aSVasily Gorbik #include "boot.h" 18c5cf5054SAlexander Egorenkov #include "uv.h" 198f75582aSVasily Gorbik 20b2d24b97SGerald Schaefer unsigned long __bootdata_preserved(__kaslr_offset); 214df29d2bSAlexander Gordeev unsigned long __bootdata_preserved(__abs_lowcore); 222f0e8aaeSAlexander Gordeev unsigned long __bootdata_preserved(__memcpy_real_area); 238e9205d2SAlexander Gordeev pte_t *__bootdata_preserved(memcpy_real_ptep); 24e3ec8e0fSAlexander Gordeev unsigned long __bootdata(__amode31_base); 250c4f2623SVasily Gorbik unsigned long __bootdata_preserved(VMALLOC_START); 260c4f2623SVasily Gorbik unsigned long __bootdata_preserved(VMALLOC_END); 270c4f2623SVasily Gorbik struct page *__bootdata_preserved(vmemmap); 280c4f2623SVasily Gorbik unsigned long __bootdata_preserved(vmemmap_size); 290c4f2623SVasily Gorbik unsigned long __bootdata_preserved(MODULES_VADDR); 300c4f2623SVasily Gorbik unsigned long __bootdata_preserved(MODULES_END); 3173045a08SVasily Gorbik unsigned long __bootdata(ident_map_size); 329f744abbSAlexander Egorenkov int __bootdata(is_full_image) = 1; 3384733284SAlexander Egorenkov struct initrd_data __bootdata(initrd_data); 34d1b52a43SVasily Gorbik 3517e89e13SSven Schnelle u64 __bootdata_preserved(stfle_fac_list[16]); 3617e89e13SSven Schnelle u64 __bootdata_preserved(alt_stfle_fac_list[16]); 37e9e7870fSAlexander Egorenkov struct oldmem_data __bootdata_preserved(oldmem_data); 3817e89e13SSven Schnelle 39bd50b743SAlexander Gordeev struct machine_info machine; 40bd50b743SAlexander Gordeev 417516fc11SVasily Gorbik void error(char *x) 427516fc11SVasily Gorbik { 437516fc11SVasily Gorbik sclp_early_printk("\n\n"); 447516fc11SVasily Gorbik sclp_early_printk(x); 457516fc11SVasily Gorbik sclp_early_printk("\n\n -- System halted"); 467516fc11SVasily Gorbik 4798587c2dSMartin Schwidefsky disabled_wait(); 487516fc11SVasily Gorbik } 497516fc11SVasily Gorbik 50bd50b743SAlexander Gordeev static void detect_facilities(void) 51bd50b743SAlexander Gordeev { 52bd50b743SAlexander Gordeev if (test_facility(8)) { 53bd50b743SAlexander Gordeev machine.has_edat1 = 1; 54bd50b743SAlexander Gordeev __ctl_set_bit(0, 23); 55bd50b743SAlexander Gordeev } 56bd50b743SAlexander Gordeev if (test_facility(78)) 57bd50b743SAlexander Gordeev machine.has_edat2 = 1; 58bd50b743SAlexander Gordeev if (!noexec_disabled && test_facility(130)) { 59bd50b743SAlexander Gordeev machine.has_nx = 1; 60bd50b743SAlexander Gordeev __ctl_set_bit(0, 20); 61bd50b743SAlexander Gordeev } 62bd50b743SAlexander Gordeev } 63bd50b743SAlexander Gordeev 64d7e7fbbaSVasily Gorbik static void setup_lpp(void) 65d7e7fbbaSVasily Gorbik { 66d7e7fbbaSVasily Gorbik S390_lowcore.current_pid = 0; 67d7e7fbbaSVasily Gorbik S390_lowcore.lpp = LPP_MAGIC; 68d7e7fbbaSVasily Gorbik if (test_facility(40)) 69d7e7fbbaSVasily Gorbik lpp(&S390_lowcore.lpp); 70d7e7fbbaSVasily Gorbik } 71d7e7fbbaSVasily Gorbik 7215426ca4SVasily Gorbik #ifdef CONFIG_KERNEL_UNCOMPRESSED 7315426ca4SVasily Gorbik unsigned long mem_safe_offset(void) 7415426ca4SVasily Gorbik { 7515426ca4SVasily Gorbik return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size; 7615426ca4SVasily Gorbik } 7715426ca4SVasily Gorbik #endif 7815426ca4SVasily Gorbik 7922476f47SVasily Gorbik static unsigned long rescue_initrd(unsigned long safe_addr) 8015426ca4SVasily Gorbik { 8115426ca4SVasily Gorbik if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD)) 8222476f47SVasily Gorbik return safe_addr; 8384733284SAlexander Egorenkov if (!initrd_data.start || !initrd_data.size) 8422476f47SVasily Gorbik return safe_addr; 8522476f47SVasily Gorbik if (initrd_data.start < safe_addr) { 8622476f47SVasily Gorbik memmove((void *)safe_addr, (void *)initrd_data.start, initrd_data.size); 8722476f47SVasily Gorbik initrd_data.start = safe_addr; 8822476f47SVasily Gorbik } 8922476f47SVasily Gorbik return initrd_data.start + initrd_data.size; 9015426ca4SVasily Gorbik } 9115426ca4SVasily Gorbik 92d1b52a43SVasily Gorbik static void copy_bootdata(void) 93d1b52a43SVasily Gorbik { 94d1b52a43SVasily Gorbik if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size) 95d1b52a43SVasily Gorbik error(".boot.data section size mismatch"); 96d1b52a43SVasily Gorbik memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size); 97bf9921a9SGerald Schaefer if (__boot_data_preserved_end - __boot_data_preserved_start != vmlinux.bootdata_preserved_size) 98bf9921a9SGerald Schaefer error(".boot.preserved.data section size mismatch"); 99bf9921a9SGerald Schaefer memcpy((void *)vmlinux.bootdata_preserved_off, __boot_data_preserved_start, vmlinux.bootdata_preserved_size); 100d1b52a43SVasily Gorbik } 101d1b52a43SVasily Gorbik 102805bc0bcSGerald Schaefer static void handle_relocs(unsigned long offset) 103805bc0bcSGerald Schaefer { 104805bc0bcSGerald Schaefer Elf64_Rela *rela_start, *rela_end, *rela; 105805bc0bcSGerald Schaefer int r_type, r_sym, rc; 106805bc0bcSGerald Schaefer Elf64_Addr loc, val; 107805bc0bcSGerald Schaefer Elf64_Sym *dynsym; 108805bc0bcSGerald Schaefer 109805bc0bcSGerald Schaefer rela_start = (Elf64_Rela *) vmlinux.rela_dyn_start; 110805bc0bcSGerald Schaefer rela_end = (Elf64_Rela *) vmlinux.rela_dyn_end; 111805bc0bcSGerald Schaefer dynsym = (Elf64_Sym *) vmlinux.dynsym_start; 112805bc0bcSGerald Schaefer for (rela = rela_start; rela < rela_end; rela++) { 113805bc0bcSGerald Schaefer loc = rela->r_offset + offset; 114ac49303dSGerald Schaefer val = rela->r_addend; 115805bc0bcSGerald Schaefer r_sym = ELF64_R_SYM(rela->r_info); 116ac49303dSGerald Schaefer if (r_sym) { 117ac49303dSGerald Schaefer if (dynsym[r_sym].st_shndx != SHN_UNDEF) 118ac49303dSGerald Schaefer val += dynsym[r_sym].st_value + offset; 119ac49303dSGerald Schaefer } else { 120ac49303dSGerald Schaefer /* 121ac49303dSGerald Schaefer * 0 == undefined symbol table index (STN_UNDEF), 122ac49303dSGerald Schaefer * used for R_390_RELATIVE, only add KASLR offset 123ac49303dSGerald Schaefer */ 124ac49303dSGerald Schaefer val += offset; 125ac49303dSGerald Schaefer } 126805bc0bcSGerald Schaefer r_type = ELF64_R_TYPE(rela->r_info); 127805bc0bcSGerald Schaefer rc = arch_kexec_do_relocs(r_type, (void *) loc, val, 0); 128805bc0bcSGerald Schaefer if (rc) 129805bc0bcSGerald Schaefer error("Unknown relocation type"); 130805bc0bcSGerald Schaefer } 131805bc0bcSGerald Schaefer } 132805bc0bcSGerald Schaefer 133980d5f9aSAlexander Egorenkov /* 13473045a08SVasily Gorbik * Merge information from several sources into a single ident_map_size value. 13573045a08SVasily Gorbik * "ident_map_size" represents the upper limit of physical memory we may ever 13673045a08SVasily Gorbik * reach. It might not be all online memory, but also include standby (offline) 13773045a08SVasily Gorbik * memory. "ident_map_size" could be lower then actual standby or even online 13873045a08SVasily Gorbik * memory present, due to limiting factors. We should never go above this limit. 13973045a08SVasily Gorbik * It is the size of our identity mapping. 14073045a08SVasily Gorbik * 14173045a08SVasily Gorbik * Consider the following factors: 14273045a08SVasily Gorbik * 1. max_physmem_end - end of physical memory online or standby. 14373045a08SVasily Gorbik * Always <= end of the last online memory block (get_mem_detect_end()). 14473045a08SVasily Gorbik * 2. CONFIG_MAX_PHYSMEM_BITS - the maximum size of physical memory the 14573045a08SVasily Gorbik * kernel is able to support. 14673045a08SVasily Gorbik * 3. "mem=" kernel command line option which limits physical memory usage. 14773045a08SVasily Gorbik * 4. OLDMEM_BASE which is a kdump memory limit when the kernel is executed as 14873045a08SVasily Gorbik * crash kernel. 14973045a08SVasily Gorbik * 5. "hsa" size which is a memory limit when the kernel is executed during 15073045a08SVasily Gorbik * zfcp/nvme dump. 15173045a08SVasily Gorbik */ 15273045a08SVasily Gorbik static void setup_ident_map_size(unsigned long max_physmem_end) 15373045a08SVasily Gorbik { 15473045a08SVasily Gorbik unsigned long hsa_size; 15573045a08SVasily Gorbik 15673045a08SVasily Gorbik ident_map_size = max_physmem_end; 15773045a08SVasily Gorbik if (memory_limit) 15873045a08SVasily Gorbik ident_map_size = min(ident_map_size, memory_limit); 15973045a08SVasily Gorbik ident_map_size = min(ident_map_size, 1UL << MAX_PHYSMEM_BITS); 16073045a08SVasily Gorbik 16173045a08SVasily Gorbik #ifdef CONFIG_CRASH_DUMP 162e9e7870fSAlexander Egorenkov if (oldmem_data.start) { 16373045a08SVasily Gorbik kaslr_enabled = 0; 164e9e7870fSAlexander Egorenkov ident_map_size = min(ident_map_size, oldmem_data.size); 16573045a08SVasily Gorbik } else if (ipl_block_valid && is_ipl_block_dump()) { 16673045a08SVasily Gorbik kaslr_enabled = 0; 16773045a08SVasily Gorbik if (!sclp_early_get_hsa_size(&hsa_size) && hsa_size) 16873045a08SVasily Gorbik ident_map_size = min(ident_map_size, hsa_size); 16973045a08SVasily Gorbik } 17073045a08SVasily Gorbik #endif 17173045a08SVasily Gorbik } 17273045a08SVasily Gorbik 173bb1520d5SAlexander Gordeev static unsigned long setup_kernel_memory_layout(void) 1740c4f2623SVasily Gorbik { 1759a39abb7SVasily Gorbik unsigned long vmemmap_start; 176bb1520d5SAlexander Gordeev unsigned long asce_limit; 1770c4f2623SVasily Gorbik unsigned long rte_size; 1780c4f2623SVasily Gorbik unsigned long pages; 17957ad19bcSAlexander Gordeev unsigned long vmax; 1800c4f2623SVasily Gorbik 1810c4f2623SVasily Gorbik pages = ident_map_size / PAGE_SIZE; 1820c4f2623SVasily Gorbik /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 1830c4f2623SVasily Gorbik vmemmap_size = SECTION_ALIGN_UP(pages) * sizeof(struct page); 1840c4f2623SVasily Gorbik 1850c4f2623SVasily Gorbik /* choose kernel address space layout: 4 or 3 levels. */ 1869a39abb7SVasily Gorbik vmemmap_start = round_up(ident_map_size, _REGION3_SIZE); 1870c4f2623SVasily Gorbik if (IS_ENABLED(CONFIG_KASAN) || 1880c4f2623SVasily Gorbik vmalloc_size > _REGION2_SIZE || 1899a39abb7SVasily Gorbik vmemmap_start + vmemmap_size + vmalloc_size + MODULES_LEN > 1909a39abb7SVasily Gorbik _REGION2_SIZE) { 191bb1520d5SAlexander Gordeev asce_limit = _REGION1_SIZE; 1929a39abb7SVasily Gorbik rte_size = _REGION2_SIZE; 1939a39abb7SVasily Gorbik } else { 194bb1520d5SAlexander Gordeev asce_limit = _REGION2_SIZE; 1959a39abb7SVasily Gorbik rte_size = _REGION3_SIZE; 1969a39abb7SVasily Gorbik } 1970c4f2623SVasily Gorbik /* 1980c4f2623SVasily Gorbik * forcing modules and vmalloc area under the ultravisor 1990c4f2623SVasily Gorbik * secure storage limit, so that any vmalloc allocation 2000c4f2623SVasily Gorbik * we do could be used to back secure guest storage. 2010c4f2623SVasily Gorbik */ 202bb1520d5SAlexander Gordeev vmax = adjust_to_uv_max(asce_limit); 2030c4f2623SVasily Gorbik #ifdef CONFIG_KASAN 2040c4f2623SVasily Gorbik /* force vmalloc and modules below kasan shadow */ 20557ad19bcSAlexander Gordeev vmax = min(vmax, KASAN_SHADOW_START); 2060c4f2623SVasily Gorbik #endif 2072f0e8aaeSAlexander Gordeev __memcpy_real_area = round_down(vmax - PAGE_SIZE, PAGE_SIZE); 2082f0e8aaeSAlexander Gordeev __abs_lowcore = round_down(__memcpy_real_area - ABS_LOWCORE_MAP_SIZE, 2092f0e8aaeSAlexander Gordeev sizeof(struct lowcore)); 2104df29d2bSAlexander Gordeev MODULES_END = round_down(__abs_lowcore, _SEGMENT_SIZE); 2110c4f2623SVasily Gorbik MODULES_VADDR = MODULES_END - MODULES_LEN; 2120c4f2623SVasily Gorbik VMALLOC_END = MODULES_VADDR; 2130c4f2623SVasily Gorbik 2149a39abb7SVasily Gorbik /* allow vmalloc area to occupy up to about 1/2 of the rest virtual space left */ 2159a39abb7SVasily Gorbik vmalloc_size = min(vmalloc_size, round_down(VMALLOC_END / 2, _REGION3_SIZE)); 2160c4f2623SVasily Gorbik VMALLOC_START = VMALLOC_END - vmalloc_size; 2170c4f2623SVasily Gorbik 2189a39abb7SVasily Gorbik /* split remaining virtual space between 1:1 mapping & vmemmap array */ 2199a39abb7SVasily Gorbik pages = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 2200c4f2623SVasily Gorbik pages = SECTION_ALIGN_UP(pages); 2219a39abb7SVasily Gorbik /* keep vmemmap_start aligned to a top level region table entry */ 2229a39abb7SVasily Gorbik vmemmap_start = round_down(VMALLOC_START - pages * sizeof(struct page), rte_size); 2239a39abb7SVasily Gorbik /* vmemmap_start is the future VMEM_MAX_PHYS, make sure it is within MAX_PHYSMEM */ 2249a39abb7SVasily Gorbik vmemmap_start = min(vmemmap_start, 1UL << MAX_PHYSMEM_BITS); 2259a39abb7SVasily Gorbik /* make sure identity map doesn't overlay with vmemmap */ 2269a39abb7SVasily Gorbik ident_map_size = min(ident_map_size, vmemmap_start); 2270c4f2623SVasily Gorbik vmemmap_size = SECTION_ALIGN_UP(ident_map_size / PAGE_SIZE) * sizeof(struct page); 2289a39abb7SVasily Gorbik /* make sure vmemmap doesn't overlay with vmalloc area */ 2299a39abb7SVasily Gorbik VMALLOC_START = max(vmemmap_start + vmemmap_size, VMALLOC_START); 2309a39abb7SVasily Gorbik vmemmap = (struct page *)vmemmap_start; 231bb1520d5SAlexander Gordeev 232bb1520d5SAlexander Gordeev return asce_limit; 2330c4f2623SVasily Gorbik } 2340c4f2623SVasily Gorbik 23573045a08SVasily Gorbik /* 236980d5f9aSAlexander Egorenkov * This function clears the BSS section of the decompressed Linux kernel and NOT the decompressor's. 237980d5f9aSAlexander Egorenkov */ 2382e83e0ebSVasily Gorbik static void clear_bss_section(void) 2392e83e0ebSVasily Gorbik { 2402e83e0ebSVasily Gorbik memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size); 2412e83e0ebSVasily Gorbik } 2422e83e0ebSVasily Gorbik 24390178c19SHeiko Carstens /* 24490178c19SHeiko Carstens * Set vmalloc area size to an 8th of (potential) physical memory 24590178c19SHeiko Carstens * size, unless size has been set by kernel command line parameter. 24690178c19SHeiko Carstens */ 24790178c19SHeiko Carstens static void setup_vmalloc_size(void) 24890178c19SHeiko Carstens { 24990178c19SHeiko Carstens unsigned long size; 25090178c19SHeiko Carstens 25190178c19SHeiko Carstens if (vmalloc_size_set) 25290178c19SHeiko Carstens return; 25373045a08SVasily Gorbik size = round_up(ident_map_size / 8, _SEGMENT_SIZE); 25490178c19SHeiko Carstens vmalloc_size = max(size, vmalloc_size); 25590178c19SHeiko Carstens } 25690178c19SHeiko Carstens 257e8f06683SAlexander Gordeev static void offset_vmlinux_info(unsigned long offset) 258e8f06683SAlexander Gordeev { 259e8f06683SAlexander Gordeev vmlinux.default_lma += offset; 260e8f06683SAlexander Gordeev *(unsigned long *)(&vmlinux.entry) += offset; 261e8f06683SAlexander Gordeev vmlinux.bootdata_off += offset; 262e8f06683SAlexander Gordeev vmlinux.bootdata_preserved_off += offset; 263e8f06683SAlexander Gordeev vmlinux.rela_dyn_start += offset; 264e8f06683SAlexander Gordeev vmlinux.rela_dyn_end += offset; 265e8f06683SAlexander Gordeev vmlinux.dynsym_start += offset; 266bb1520d5SAlexander Gordeev vmlinux.init_mm_off += offset; 267bb1520d5SAlexander Gordeev vmlinux.swapper_pg_dir_off += offset; 268bb1520d5SAlexander Gordeev vmlinux.invalid_pg_dir_off += offset; 269e8f06683SAlexander Gordeev } 270e8f06683SAlexander Gordeev 271e3ec8e0fSAlexander Gordeev static unsigned long reserve_amode31(unsigned long safe_addr) 272e3ec8e0fSAlexander Gordeev { 273e3ec8e0fSAlexander Gordeev __amode31_base = PAGE_ALIGN(safe_addr); 274e3ec8e0fSAlexander Gordeev return safe_addr + vmlinux.amode31_size; 275e3ec8e0fSAlexander Gordeev } 276e3ec8e0fSAlexander Gordeev 2778f75582aSVasily Gorbik void startup_kernel(void) 2788f75582aSVasily Gorbik { 27922476f47SVasily Gorbik unsigned long max_physmem_end; 280b2d24b97SGerald Schaefer unsigned long random_lma; 2819641b8ccSMartin Schwidefsky unsigned long safe_addr; 282bb1520d5SAlexander Gordeev unsigned long asce_limit; 283369f91c3SVasily Gorbik void *img; 284bb1520d5SAlexander Gordeev psw_t psw; 2858f75582aSVasily Gorbik 28684733284SAlexander Egorenkov initrd_data.start = parmarea.initrd_start; 28784733284SAlexander Egorenkov initrd_data.size = parmarea.initrd_size; 288e9e7870fSAlexander Egorenkov oldmem_data.start = parmarea.oldmem_base; 289e9e7870fSAlexander Egorenkov oldmem_data.size = parmarea.oldmem_size; 29084733284SAlexander Egorenkov 291d7e7fbbaSVasily Gorbik setup_lpp(); 29249698745SVasily Gorbik store_ipl_parmblock(); 2939641b8ccSMartin Schwidefsky safe_addr = mem_safe_offset(); 294e3ec8e0fSAlexander Gordeev safe_addr = reserve_amode31(safe_addr); 2959641b8ccSMartin Schwidefsky safe_addr = read_ipl_report(safe_addr); 2969641b8ccSMartin Schwidefsky uv_query_info(); 29722476f47SVasily Gorbik safe_addr = rescue_initrd(safe_addr); 2989641b8ccSMartin Schwidefsky sclp_early_read_info(); 29949698745SVasily Gorbik setup_boot_command_line(); 300b5e80459SVasily Gorbik parse_boot_command_line(); 301*d1725ca6SVasily Gorbik detect_facilities(); 30242c89439SAlexander Egorenkov sanitize_prot_virt_host(); 30322476f47SVasily Gorbik max_physmem_end = detect_memory(&safe_addr); 30422476f47SVasily Gorbik setup_ident_map_size(max_physmem_end); 30590178c19SHeiko Carstens setup_vmalloc_size(); 306bb1520d5SAlexander Gordeev asce_limit = setup_kernel_memory_layout(); 307bf64f051SVasily Gorbik mem_detect_truncate(ident_map_size); 308b2d24b97SGerald Schaefer 309b2d24b97SGerald Schaefer if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) { 310b2d24b97SGerald Schaefer random_lma = get_random_base(safe_addr); 311b2d24b97SGerald Schaefer if (random_lma) { 312b2d24b97SGerald Schaefer __kaslr_offset = random_lma - vmlinux.default_lma; 313b2d24b97SGerald Schaefer img = (void *)vmlinux.default_lma; 314e8f06683SAlexander Gordeev offset_vmlinux_info(__kaslr_offset); 315b2d24b97SGerald Schaefer } 316b2d24b97SGerald Schaefer } 317b2d24b97SGerald Schaefer 3188f75582aSVasily Gorbik if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) { 319369f91c3SVasily Gorbik img = decompress_kernel(); 320369f91c3SVasily Gorbik memmove((void *)vmlinux.default_lma, img, vmlinux.image_size); 321b2d24b97SGerald Schaefer } else if (__kaslr_offset) 322b2d24b97SGerald Schaefer memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size); 323b2d24b97SGerald Schaefer 324bb1520d5SAlexander Gordeev /* 325bb1520d5SAlexander Gordeev * The order of the following operations is important: 326bb1520d5SAlexander Gordeev * 327bb1520d5SAlexander Gordeev * - handle_relocs() must follow clear_bss_section() to establish static 328bb1520d5SAlexander Gordeev * memory references to data in .bss to be used by setup_vmem() 329bb1520d5SAlexander Gordeev * (i.e init_mm.pgd) 330bb1520d5SAlexander Gordeev * 331bb1520d5SAlexander Gordeev * - setup_vmem() must follow handle_relocs() to be able using 332bb1520d5SAlexander Gordeev * static memory references to data in .bss (i.e init_mm.pgd) 333bb1520d5SAlexander Gordeev * 334bb1520d5SAlexander Gordeev * - copy_bootdata() must follow setup_vmem() to propagate changes to 335bb1520d5SAlexander Gordeev * bootdata made by setup_vmem() 336bb1520d5SAlexander Gordeev */ 3372e83e0ebSVasily Gorbik clear_bss_section(); 338b2d24b97SGerald Schaefer handle_relocs(__kaslr_offset); 339bf64f051SVasily Gorbik setup_vmem(asce_limit); 340bb1520d5SAlexander Gordeev copy_bootdata(); 341b2d24b97SGerald Schaefer 342b2d24b97SGerald Schaefer if (__kaslr_offset) { 343a9f2f686SGerald Schaefer /* 344a9f2f686SGerald Schaefer * Save KASLR offset for early dumps, before vmcore_info is set. 345a9f2f686SGerald Schaefer * Mark as uneven to distinguish from real vmcore_info pointer. 346a9f2f686SGerald Schaefer */ 347a9f2f686SGerald Schaefer S390_lowcore.vmcore_info = __kaslr_offset | 0x1UL; 348b2d24b97SGerald Schaefer /* Clear non-relocated kernel */ 349b2d24b97SGerald Schaefer if (IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) 350b2d24b97SGerald Schaefer memset(img, 0, vmlinux.image_size); 351b2d24b97SGerald Schaefer } 352bb1520d5SAlexander Gordeev 353bb1520d5SAlexander Gordeev /* 354bb1520d5SAlexander Gordeev * Jump to the decompressed kernel entry point and switch DAT mode on. 355bb1520d5SAlexander Gordeev */ 356bb1520d5SAlexander Gordeev psw.addr = vmlinux.entry; 357bb1520d5SAlexander Gordeev psw.mask = PSW_KERNEL_BITS; 358bb1520d5SAlexander Gordeev __load_psw(psw); 3598f75582aSVasily Gorbik } 360