mirror of https://gitee.com/openkylin/linux.git
474 lines
11 KiB
C
474 lines
11 KiB
C
/*
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* Extensible Firmware Interface
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*
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* Based on Extensible Firmware Interface Specification version 2.4
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*
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* Copyright (C) 2013, 2014 Linaro Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/efi.h>
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#include <linux/export.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/cacheflush.h>
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#include <asm/efi.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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struct efi_memory_map memmap;
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static efi_runtime_services_t *runtime;
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static u64 efi_system_table;
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static int uefi_debug __initdata;
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static int __init uefi_debug_setup(char *str)
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{
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uefi_debug = 1;
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return 0;
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}
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early_param("uefi_debug", uefi_debug_setup);
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static int __init is_normal_ram(efi_memory_desc_t *md)
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{
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if (md->attribute & EFI_MEMORY_WB)
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return 1;
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return 0;
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}
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static void __init efi_setup_idmap(void)
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{
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struct memblock_region *r;
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efi_memory_desc_t *md;
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u64 paddr, npages, size;
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for_each_memblock(memory, r)
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create_id_mapping(r->base, r->size, 0);
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/* map runtime io spaces */
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for_each_efi_memory_desc(&memmap, md) {
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if (!(md->attribute & EFI_MEMORY_RUNTIME) || is_normal_ram(md))
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continue;
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paddr = md->phys_addr;
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npages = md->num_pages;
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memrange_efi_to_native(&paddr, &npages);
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size = npages << PAGE_SHIFT;
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create_id_mapping(paddr, size, 1);
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}
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}
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static int __init uefi_init(void)
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{
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efi_char16_t *c16;
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char vendor[100] = "unknown";
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int i, retval;
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efi.systab = early_memremap(efi_system_table,
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sizeof(efi_system_table_t));
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if (efi.systab == NULL) {
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pr_warn("Unable to map EFI system table.\n");
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return -ENOMEM;
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}
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set_bit(EFI_BOOT, &efi.flags);
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set_bit(EFI_64BIT, &efi.flags);
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/*
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* Verify the EFI Table
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*/
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if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
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pr_err("System table signature incorrect\n");
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retval = -EINVAL;
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goto out;
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}
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if ((efi.systab->hdr.revision >> 16) < 2)
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pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff);
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/* Show what we know for posterity */
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c16 = early_memremap(efi.systab->fw_vendor,
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sizeof(vendor));
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if (c16) {
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for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
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vendor[i] = c16[i];
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vendor[i] = '\0';
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early_memunmap(c16, sizeof(vendor));
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}
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pr_info("EFI v%u.%.02u by %s\n",
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efi.systab->hdr.revision >> 16,
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efi.systab->hdr.revision & 0xffff, vendor);
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retval = efi_config_init(NULL);
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if (retval == 0)
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set_bit(EFI_CONFIG_TABLES, &efi.flags);
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out:
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early_memunmap(efi.systab, sizeof(efi_system_table_t));
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return retval;
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}
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/*
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* Return true for RAM regions we want to permanently reserve.
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*/
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static __init int is_reserve_region(efi_memory_desc_t *md)
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{
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if (!is_normal_ram(md))
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return 0;
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if (md->attribute & EFI_MEMORY_RUNTIME)
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return 1;
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if (md->type == EFI_ACPI_RECLAIM_MEMORY ||
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md->type == EFI_RESERVED_TYPE)
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return 1;
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return 0;
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}
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static __init void reserve_regions(void)
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{
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efi_memory_desc_t *md;
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u64 paddr, npages, size;
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if (uefi_debug)
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pr_info("Processing EFI memory map:\n");
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for_each_efi_memory_desc(&memmap, md) {
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paddr = md->phys_addr;
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npages = md->num_pages;
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if (uefi_debug) {
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char buf[64];
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pr_info(" 0x%012llx-0x%012llx %s",
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paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
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efi_md_typeattr_format(buf, sizeof(buf), md));
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}
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memrange_efi_to_native(&paddr, &npages);
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size = npages << PAGE_SHIFT;
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if (is_normal_ram(md))
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early_init_dt_add_memory_arch(paddr, size);
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if (is_reserve_region(md) ||
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md->type == EFI_BOOT_SERVICES_CODE ||
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md->type == EFI_BOOT_SERVICES_DATA) {
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memblock_reserve(paddr, size);
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if (uefi_debug)
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pr_cont("*");
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}
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if (uefi_debug)
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pr_cont("\n");
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}
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set_bit(EFI_MEMMAP, &efi.flags);
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}
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static u64 __init free_one_region(u64 start, u64 end)
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{
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u64 size = end - start;
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if (uefi_debug)
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pr_info(" EFI freeing: 0x%012llx-0x%012llx\n", start, end - 1);
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free_bootmem_late(start, size);
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return size;
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}
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static u64 __init free_region(u64 start, u64 end)
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{
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u64 map_start, map_end, total = 0;
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if (end <= start)
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return total;
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map_start = (u64)memmap.phys_map;
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map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map));
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map_start &= PAGE_MASK;
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if (start < map_end && end > map_start) {
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/* region overlaps UEFI memmap */
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if (start < map_start)
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total += free_one_region(start, map_start);
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if (map_end < end)
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total += free_one_region(map_end, end);
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} else
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total += free_one_region(start, end);
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return total;
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}
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static void __init free_boot_services(void)
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{
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u64 total_freed = 0;
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u64 keep_end, free_start, free_end;
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efi_memory_desc_t *md;
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/*
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* If kernel uses larger pages than UEFI, we have to be careful
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* not to inadvertantly free memory we want to keep if there is
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* overlap at the kernel page size alignment. We do not want to
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* free is_reserve_region() memory nor the UEFI memmap itself.
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*
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* The memory map is sorted, so we keep track of the end of
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* any previous region we want to keep, remember any region
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* we want to free and defer freeing it until we encounter
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* the next region we want to keep. This way, before freeing
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* it, we can clip it as needed to avoid freeing memory we
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* want to keep for UEFI.
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*/
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keep_end = 0;
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free_start = 0;
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for_each_efi_memory_desc(&memmap, md) {
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u64 paddr, npages, size;
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if (is_reserve_region(md)) {
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/*
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* We don't want to free any memory from this region.
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*/
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if (free_start) {
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/* adjust free_end then free region */
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if (free_end > md->phys_addr)
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free_end -= PAGE_SIZE;
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total_freed += free_region(free_start, free_end);
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free_start = 0;
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}
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keep_end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
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continue;
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}
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if (md->type != EFI_BOOT_SERVICES_CODE &&
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md->type != EFI_BOOT_SERVICES_DATA) {
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/* no need to free this region */
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continue;
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}
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/*
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* We want to free memory from this region.
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*/
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paddr = md->phys_addr;
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npages = md->num_pages;
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memrange_efi_to_native(&paddr, &npages);
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size = npages << PAGE_SHIFT;
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if (free_start) {
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if (paddr <= free_end)
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free_end = paddr + size;
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else {
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total_freed += free_region(free_start, free_end);
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free_start = paddr;
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free_end = paddr + size;
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}
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} else {
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free_start = paddr;
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free_end = paddr + size;
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}
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if (free_start < keep_end) {
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free_start += PAGE_SIZE;
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if (free_start >= free_end)
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free_start = 0;
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}
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}
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if (free_start)
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total_freed += free_region(free_start, free_end);
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if (total_freed)
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pr_info("Freed 0x%llx bytes of EFI boot services memory",
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total_freed);
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}
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void __init efi_init(void)
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{
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struct efi_fdt_params params;
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/* Grab UEFI information placed in FDT by stub */
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if (!efi_get_fdt_params(¶ms, uefi_debug))
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return;
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efi_system_table = params.system_table;
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memblock_reserve(params.mmap & PAGE_MASK,
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PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
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memmap.phys_map = (void *)params.mmap;
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memmap.map = early_memremap(params.mmap, params.mmap_size);
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memmap.map_end = memmap.map + params.mmap_size;
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memmap.desc_size = params.desc_size;
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memmap.desc_version = params.desc_ver;
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if (uefi_init() < 0)
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return;
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reserve_regions();
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}
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void __init efi_idmap_init(void)
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{
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if (!efi_enabled(EFI_BOOT))
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return;
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/* boot time idmap_pg_dir is incomplete, so fill in missing parts */
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efi_setup_idmap();
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}
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static int __init remap_region(efi_memory_desc_t *md, void **new)
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{
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u64 paddr, vaddr, npages, size;
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paddr = md->phys_addr;
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npages = md->num_pages;
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memrange_efi_to_native(&paddr, &npages);
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size = npages << PAGE_SHIFT;
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if (is_normal_ram(md))
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vaddr = (__force u64)ioremap_cache(paddr, size);
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else
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vaddr = (__force u64)ioremap(paddr, size);
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if (!vaddr) {
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pr_err("Unable to remap 0x%llx pages @ %p\n",
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npages, (void *)paddr);
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return 0;
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}
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/* adjust for any rounding when EFI and system pagesize differs */
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md->virt_addr = vaddr + (md->phys_addr - paddr);
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if (uefi_debug)
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pr_info(" EFI remap 0x%012llx => %p\n",
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md->phys_addr, (void *)md->virt_addr);
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memcpy(*new, md, memmap.desc_size);
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*new += memmap.desc_size;
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return 1;
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}
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/*
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* Switch UEFI from an identity map to a kernel virtual map
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*/
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static int __init arm64_enter_virtual_mode(void)
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{
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efi_memory_desc_t *md;
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phys_addr_t virtmap_phys;
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void *virtmap, *virt_md;
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efi_status_t status;
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u64 mapsize;
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int count = 0;
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unsigned long flags;
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if (!efi_enabled(EFI_BOOT)) {
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pr_info("EFI services will not be available.\n");
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return -1;
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}
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mapsize = memmap.map_end - memmap.map;
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early_memunmap(memmap.map, mapsize);
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if (efi_runtime_disabled()) {
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pr_info("EFI runtime services will be disabled.\n");
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return -1;
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}
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pr_info("Remapping and enabling EFI services.\n");
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/* replace early memmap mapping with permanent mapping */
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memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
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mapsize);
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memmap.map_end = memmap.map + mapsize;
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efi.memmap = &memmap;
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/* Map the runtime regions */
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virtmap = kmalloc(mapsize, GFP_KERNEL);
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if (!virtmap) {
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pr_err("Failed to allocate EFI virtual memmap\n");
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return -1;
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}
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virtmap_phys = virt_to_phys(virtmap);
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virt_md = virtmap;
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for_each_efi_memory_desc(&memmap, md) {
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if (!(md->attribute & EFI_MEMORY_RUNTIME))
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continue;
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if (!remap_region(md, &virt_md))
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goto err_unmap;
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++count;
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}
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efi.systab = (__force void *)efi_lookup_mapped_addr(efi_system_table);
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if (!efi.systab) {
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/*
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* If we have no virtual mapping for the System Table at this
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* point, the memory map doesn't cover the physical offset where
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* it resides. This means the System Table will be inaccessible
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* to Runtime Services themselves once the virtual mapping is
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* installed.
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*/
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pr_err("Failed to remap EFI System Table -- buggy firmware?\n");
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goto err_unmap;
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}
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set_bit(EFI_SYSTEM_TABLES, &efi.flags);
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local_irq_save(flags);
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cpu_switch_mm(idmap_pg_dir, &init_mm);
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/* Call SetVirtualAddressMap with the physical address of the map */
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runtime = efi.systab->runtime;
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efi.set_virtual_address_map = runtime->set_virtual_address_map;
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status = efi.set_virtual_address_map(count * memmap.desc_size,
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memmap.desc_size,
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memmap.desc_version,
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(efi_memory_desc_t *)virtmap_phys);
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cpu_set_reserved_ttbr0();
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flush_tlb_all();
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local_irq_restore(flags);
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kfree(virtmap);
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free_boot_services();
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if (status != EFI_SUCCESS) {
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pr_err("Failed to set EFI virtual address map! [%lx]\n",
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status);
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return -1;
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}
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/* Set up runtime services function pointers */
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runtime = efi.systab->runtime;
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efi_native_runtime_setup();
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set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
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efi.runtime_version = efi.systab->hdr.revision;
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return 0;
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err_unmap:
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/* unmap all mappings that succeeded: there are 'count' of those */
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for (virt_md = virtmap; count--; virt_md += memmap.desc_size) {
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md = virt_md;
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iounmap((__force void __iomem *)md->virt_addr);
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}
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kfree(virtmap);
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return -1;
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}
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early_initcall(arm64_enter_virtual_mode);
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