Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

[linux.git] / arch / arm64 / kernel / efi.c

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index de46b50f4cdf952087e77d473314e75728efeec0..4eeb17198cfaf598fd403b1e4040c77f5ee3068a 100644 (file)
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -127,7 +127,11 @@ static int __init uefi_init(void)
        table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables;
        config_tables = early_memremap(efi_to_phys(efi.systab->tables),
                                       table_size);
-
+       if (config_tables == NULL) {
+               pr_warn("Unable to map EFI config table array.\n");
+               retval = -ENOMEM;
+               goto out;
+       }
        retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
                                         sizeof(efi_config_table_64_t), NULL);
 
@@ -209,6 +213,14 @@ void __init efi_init(void)
                         PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
        memmap.phys_map = params.mmap;
        memmap.map = early_memremap(params.mmap, params.mmap_size);
+       if (memmap.map == NULL) {
+               /*
+               * If we are booting via UEFI, the UEFI memory map is the only
+               * description of memory we have, so there is little point in
+               * proceeding if we cannot access it.
+               */
+               panic("Unable to map EFI memory map.\n");
+       }
        memmap.map_end = memmap.map + params.mmap_size;
        memmap.desc_size = params.desc_size;
        memmap.desc_version = params.desc_ver;
@@ -224,8 +236,9 @@ static bool __init efi_virtmap_init(void)
 {
        efi_memory_desc_t *md;
 
+       init_new_context(NULL, &efi_mm);
+
        for_each_efi_memory_desc(&memmap, md) {
-               u64 paddr, npages, size;
                pgprot_t prot;
 
                if (!(md->attribute & EFI_MEMORY_RUNTIME))
@@ -233,11 +246,6 @@ static bool __init efi_virtmap_init(void)
                if (md->virt_addr == 0)
                        return false;
 
-               paddr = md->phys_addr;
-               npages = md->num_pages;
-               memrange_efi_to_native(&paddr, &npages);
-               size = npages << PAGE_SHIFT;
-
                pr_info("  EFI remap 0x%016llx => %p\n",
                        md->phys_addr, (void *)md->virt_addr);
 
@@ -254,7 +262,9 @@ static bool __init efi_virtmap_init(void)
                else
                        prot = PAGE_KERNEL;
 
-               create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, prot);
+               create_pgd_mapping(&efi_mm, md->phys_addr, md->virt_addr,
+                                  md->num_pages << EFI_PAGE_SHIFT, 
+                                  __pgprot(pgprot_val(prot) | PTE_NG));
        }
        return true;
 }
@@ -270,12 +280,12 @@ static int __init arm64_enable_runtime_services(void)
 
        if (!efi_enabled(EFI_BOOT)) {
                pr_info("EFI services will not be available.\n");
-               return -1;
+               return 0;
        }
 
        if (efi_runtime_disabled()) {
                pr_info("EFI runtime services will be disabled.\n");
-               return -1;
+               return 0;
        }
 
        pr_info("Remapping and enabling EFI services.\n");
@@ -285,7 +295,7 @@ static int __init arm64_enable_runtime_services(void)
                                                   mapsize);
        if (!memmap.map) {
                pr_err("Failed to remap EFI memory map\n");
-               return -1;
+               return -ENOMEM;
        }
        memmap.map_end = memmap.map + mapsize;
        efi.memmap = &memmap;
@@ -294,13 +304,13 @@ static int __init arm64_enable_runtime_services(void)
                                                   sizeof(efi_system_table_t));
        if (!efi.systab) {
                pr_err("Failed to remap EFI System Table\n");
-               return -1;
+               return -ENOMEM;
        }
        set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 
        if (!efi_virtmap_init()) {
                pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
-               return -1;
+               return -ENOMEM;
        }
 
        /* Set up runtime services function pointers */
@@ -329,14 +339,7 @@ core_initcall(arm64_dmi_init);
 
 static void efi_set_pgd(struct mm_struct *mm)
 {
-       if (mm == &init_mm)
-               cpu_set_reserved_ttbr0();
-       else
-               cpu_switch_mm(mm->pgd, mm);
-
-       local_flush_tlb_all();
-       if (icache_is_aivivt())
-               __local_flush_icache_all();
+       switch_mm(NULL, mm, NULL);
 }
 
 void efi_virtmap_load(void)