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Diffstat (limited to 'arch/x86/platform/efi/efi.c')
-rw-r--r--arch/x86/platform/efi/efi.c66
1 files changed, 53 insertions, 13 deletions
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 92660edaa1e..aded2a91162 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -31,6 +31,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/efi.h>
+#include <linux/efi-bgrt.h>
#include <linux/export.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
@@ -419,10 +420,21 @@ void __init efi_reserve_boot_services(void)
}
}
-static void __init efi_free_boot_services(void)
+static void __init efi_unmap_memmap(void)
+{
+ if (memmap.map) {
+ early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
+ memmap.map = NULL;
+ }
+}
+
+void __init efi_free_boot_services(void)
{
void *p;
+ if (!efi_native)
+ return;
+
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p;
unsigned long long start = md->phys_addr;
@@ -438,6 +450,8 @@ static void __init efi_free_boot_services(void)
free_bootmem_late(start, size);
}
+
+ efi_unmap_memmap();
}
static int __init efi_systab_init(void *phys)
@@ -732,6 +746,11 @@ void __init efi_init(void)
#endif
}
+void __init efi_late_init(void)
+{
+ efi_bgrt_init();
+}
+
void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
{
u64 addr, npages;
@@ -764,6 +783,34 @@ static void __init runtime_code_page_mkexec(void)
}
/*
+ * We can't ioremap data in EFI boot services RAM, because we've already mapped
+ * it as RAM. So, look it up in the existing EFI memory map instead. Only
+ * callable after efi_enter_virtual_mode and before efi_free_boot_services.
+ */
+void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
+{
+ void *p;
+ if (WARN_ON(!memmap.map))
+ return NULL;
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ efi_memory_desc_t *md = p;
+ u64 size = md->num_pages << EFI_PAGE_SHIFT;
+ u64 end = md->phys_addr + size;
+ if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
+ md->type != EFI_BOOT_SERVICES_CODE &&
+ md->type != EFI_BOOT_SERVICES_DATA)
+ continue;
+ if (!md->virt_addr)
+ continue;
+ if (phys_addr >= md->phys_addr && phys_addr < end) {
+ phys_addr += md->virt_addr - md->phys_addr;
+ return (__force void __iomem *)(unsigned long)phys_addr;
+ }
+ }
+ return NULL;
+}
+
+/*
* This function will switch the EFI runtime services to virtual mode.
* Essentially, look through the EFI memmap and map every region that
* has the runtime attribute bit set in its memory descriptor and update
@@ -787,8 +834,10 @@ void __init efi_enter_virtual_mode(void)
* non-native EFI
*/
- if (!efi_native)
- goto out;
+ if (!efi_native) {
+ efi_unmap_memmap();
+ return;
+ }
/* Merge contiguous regions of the same type and attribute */
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
@@ -878,18 +927,12 @@ void __init efi_enter_virtual_mode(void)
}
/*
- * Thankfully, it does seem that no runtime services other than
- * SetVirtualAddressMap() will touch boot services code, so we can
- * get rid of it all at this point
- */
- efi_free_boot_services();
-
- /*
* Now that EFI is in virtual mode, update the function
* pointers in the runtime service table to the new virtual addresses.
*
* Call EFI services through wrapper functions.
*/
+ efi.runtime_version = efi_systab.fw_revision;
efi.get_time = virt_efi_get_time;
efi.set_time = virt_efi_set_time;
efi.get_wakeup_time = virt_efi_get_wakeup_time;
@@ -906,9 +949,6 @@ void __init efi_enter_virtual_mode(void)
if (__supported_pte_mask & _PAGE_NX)
runtime_code_page_mkexec();
-out:
- early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
- memmap.map = NULL;
kfree(new_memmap);
}