1 // SPDX-License-Identifier: GPL-2.0-only
5  * This file contains the setup_arch() code, which handles the architecture-dependent
11 #include <linux/dma-map-ops.h>
23 #include <linux/usb/xhci-dbgp.h>
46 #include <asm/pci-direct.h>
58  * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
80  * These are the four main kernel memory regions, we put them into
177  * copy_edd() - Copy the BIOS EDD information
197 	size_t mask = align - 1;  in extend_brk()
224 				 _brk_end - _brk_start);  in reserve_brk()
274 	printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",  in relocate_initrd()
275 	       relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);  in relocate_initrd()
279 	printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"  in relocate_initrd()
280 		" [mem %#010llx-%#010llx]\n",  in relocate_initrd()
281 		ramdisk_image, ramdisk_image + ramdisk_size - 1,  in relocate_initrd()
282 		relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);  in relocate_initrd()
296 	memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);  in early_reserve_initrd()
312 	printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,  in reserve_initrd()
313 			ramdisk_end - 1);  in reserve_initrd()
325 	memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);  in reserve_initrd()
347 		data_len = data->len + sizeof(struct setup_data);  in parse_setup_data()
348 		data_type = data->type;  in parse_setup_data()
349 		pa_next = data->next;  in parse_setup_data()
377 		memblock_reserve(pa_data, sizeof(*data) + data->len);  in memblock_x86_reserve_range_setup_data()
379 		if (data->type == SETUP_INDIRECT &&  in memblock_x86_reserve_range_setup_data()
380 		    ((struct setup_indirect *)data->data)->type != SETUP_INDIRECT)  in memblock_x86_reserve_range_setup_data()
381 			memblock_reserve(((struct setup_indirect *)data->data)->addr,  in memblock_x86_reserve_range_setup_data()
382 					 ((struct setup_indirect *)data->data)->len);  in memblock_x86_reserve_range_setup_data()
384 		pa_data = data->next;  in memblock_x86_reserve_range_setup_data()
390  * --------- Crashkernel reservation ------------------------------
395 /* 16M alignment for crash kernel regions */
401  * Earlier 32-bits kernels would limit the kernel to the low 512 MB range
404  * 64-bit kdump kernels need to be restricted to be under 64 TB, which is
405  * the upper limit of system RAM in 4-level paging mode. Since the kdump
406  * jump could be from 5-level paging to 4-level paging, the jump will fail if
433 		 * -swiotlb size: user-specified with swiotlb= or default.  in reserve_crashkernel_low()
435 		 * -swiotlb overflow buffer: now hardcoded to 32k. We round it  in reserve_crashkernel_low()
438 		 * don't run out of DMA buffers for 32-bit devices.  in reserve_crashkernel_low()
451 		return -ENOMEM;  in reserve_crashkernel_low()
460 	crashk_low_res.end   = low_base + low_size - 1;  in reserve_crashkernel_low()
509 			pr_info("crashkernel reservation failed - No suitable area found.\n");  in reserve_crashkernel()
518 			pr_info("crashkernel reservation failed - memory is in use.\n");  in reserve_crashkernel()
534 	crashk_res.end   = crash_base + crash_size - 1;  in reserve_crashkernel()
661 	 * area (640Kb -> 1Mb) as RAM even though it is not.  in trim_bios_range()
664 	e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);  in trim_bios_range()
673 	u64 size = __pa_symbol(_end) - start;  in e820_add_kernel_range()
679 	 * exclude kernel range. If we really are running on top non-RAM,  in e820_add_kernel_range()
699 			 (unsigned long)__end_of_kernel_reserve - (unsigned long)_text);  in early_reserve_memory()
733 		pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",  in dump_kernel_offset()
737 			 MODULES_VADDR-1);  in dump_kernel_offset()
753  * setup_arch - architecture-specific boot-time initializations
847 	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;  in setup_arch()
858 	code_resource.end = __pa_symbol(_etext)-1;  in setup_arch()
860 	rodata_resource.end = __pa_symbol(__end_rodata)-1;  in setup_arch()
862 	data_resource.end = __pa_symbol(_edata)-1;  in setup_arch()
864 	bss_resource.end = __pa_symbol(__bss_stop)-1;  in setup_arch()
895 	 * Memory used by the kernel cannot be hot-removed because Linux  in setup_arch()
905 	 * node the kernel resides in as un-hotpluggable.  in setup_arch()
907 	 * Since on modern servers, one node could have double-digit  in setup_arch()
909 	 * image is also un-hotpluggable. So before SRAT is parsed, just  in setup_arch()
964 	 * partially used pages are not usable - thus  in setup_arch()
995 	/* How many end-of-memory variables you have, grandma! */  in setup_arch()
997 	if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))  in setup_arch()
1002 	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;  in setup_arch()
1006 	 * Find and reserve possible boot-time SMP configuration:  in setup_arch()
1049 	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",  in setup_arch()
1050 			(max_pfn_mapped<<PAGE_SHIFT) - 1);  in setup_arch()
1055 	 * there is not enough free memory under 1M, on EFI-enabled systems  in setup_arch()
1076 	 * auditing all the early-boot CR4 manipulation would be needed to  in setup_arch()
1087 	 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.  in setup_arch()
1100 			pr_info("Secure boot disabled\n");  in setup_arch()
1103 			pr_info("Secure boot enabled\n");  in setup_arch()
1106 			pr_info("Secure boot could not be determined\n");  in setup_arch()
1129 		hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);  in setup_arch()
1169 	 * get boot-time SMP configuration:  in setup_arch()
1206 	 * This needs to run before setup_local_APIC() which soft-disables the  in setup_arch()