^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Extensible Firmware Interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Based on Extensible Firmware Interface Specification version 2.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2013, 2014 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mm_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/preempt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/rbtree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/rwsem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/mmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/ptdump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static struct ptdump_info efi_ptdump_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .mm = &efi_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .markers = (struct addr_marker[]){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) { 0, "UEFI runtime start" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) { DEFAULT_MAP_WINDOW_64, "UEFI runtime end" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) { -1, NULL }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .base_addr = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int __init ptdump_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (efi_enabled(EFI_RUNTIME_SERVICES))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) device_initcall(ptdump_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static bool __init efi_virtmap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) efi_memory_desc_t *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) efi_mm.pgd = pgd_alloc(&efi_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) mm_init_cpumask(&efi_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) init_new_context(NULL, &efi_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) for_each_efi_memory_desc(md) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) phys_addr_t phys = md->phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (!(md->attribute & EFI_MEMORY_RUNTIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (md->virt_addr == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ret = efi_create_mapping(&efi_mm, md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) &phys, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * non-early mapping of the UEFI system table and virtual mappings for all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * EFI_MEMORY_RUNTIME regions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int __init arm_enable_runtime_services(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) u64 mapsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!efi_enabled(EFI_BOOT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pr_info("EFI services will not be available.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) efi_memmap_unmap();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) pr_err("Failed to remap EFI memory map\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (efi_soft_reserve_enabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) efi_memory_desc_t *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for_each_efi_memory_desc(md) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int md_size = md->num_pages << EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (!(md->attribute & EFI_MEMORY_SP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) res = kzalloc(sizeof(*res), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (WARN_ON(!res))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) res->start = md->phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) res->end = md->phys_addr + md_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) res->name = "Soft Reserved";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) res->flags = IORESOURCE_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) res->desc = IORES_DESC_SOFT_RESERVED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) insert_resource(&iomem_resource, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (efi_runtime_disabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pr_info("EFI runtime services will be disabled.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (efi_enabled(EFI_RUNTIME_SERVICES)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) pr_info("EFI runtime services access via paravirt.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) pr_info("Remapping and enabling EFI services.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (!efi_virtmap_init()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* Set up runtime services function pointers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) efi_native_runtime_setup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) early_initcall(arm_enable_runtime_services);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) void efi_virtmap_load(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) efi_set_pgd(&efi_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) void efi_virtmap_unload(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) efi_set_pgd(current->active_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static int __init arm_dmi_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * On arm64/ARM, DMI depends on UEFI, and dmi_setup() needs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * be called early because dmi_id_init(), which is an arch_initcall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * itself, depends on dmi_scan_machine() having been called already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) dmi_setup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) core_initcall(arm_dmi_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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