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path: root/drivers/firmware/efi/arm-runtime.c
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Diffstat (limited to 'drivers/firmware/efi/arm-runtime.c')
-rw-r--r--drivers/firmware/efi/arm-runtime.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 16c7d2a71156..771750df6b7d 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -42,10 +42,12 @@ static struct mm_struct efi_mm = {
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
+ bool systab_found;
efi_mm.pgd = pgd_alloc(&efi_mm);
init_new_context(NULL, &efi_mm);
+ systab_found = false;
for_each_efi_memory_desc(&memmap, md) {
phys_addr_t phys = md->phys_addr;
int ret;
@@ -64,8 +66,20 @@ static bool __init efi_virtmap_init(void)
&phys, ret);
return false;
}
+ /*
+ * If this entry covers the address of the UEFI system table,
+ * calculate and record its virtual address.
+ */
+ if (efi_system_table >= phys &&
+ efi_system_table < phys + (md->num_pages * EFI_PAGE_SIZE)) {
+ efi.systab = (void *)(unsigned long)(efi_system_table -
+ phys + md->virt_addr);
+ systab_found = true;
+ }
}
- return true;
+ if (!systab_found)
+ pr_err("No virtual mapping found for the UEFI System Table\n");
+ return systab_found;
}
/*
@@ -99,15 +113,8 @@ static int __init arm_enable_runtime_services(void)
memmap.map_end = memmap.map + mapsize;
efi.memmap = &memmap;
- efi.systab = (__force void *)ioremap_cache(efi_system_table,
- sizeof(efi_system_table_t));
- if (!efi.systab) {
- pr_err("Failed to remap EFI System Table\n");
- return -ENOMEM;
- }
-
if (!efi_virtmap_init()) {
- pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
+ pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
return -ENOMEM;
}
@@ -115,8 +122,6 @@ static int __init arm_enable_runtime_services(void)
efi_native_runtime_setup();
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
- efi.runtime_version = efi.systab->hdr.revision;
-
return 0;
}
early_initcall(arm_enable_runtime_services);