Add two small functions:
efi_merge_regions and efi_map_regions, efi_enter_virtual_mode
calls them instead of embedding two long for loop.
v1->v2:
refresh; coding style fixes.
Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
---
arch/x86/platform/efi/efi.c | 107 +++++++++++++++++++++++++-------------------
1 file changed, 63 insertions(+), 44 deletions(-)
--- linux-2.6.orig/arch/x86/platform/efi/efi.c
+++ linux-2.6/arch/x86/platform/efi/efi.c
@@ -773,44 +773,12 @@ void __init old_map_region(efi_memory_de
(unsigned long long)md->phys_addr);
}
-/*
- * This function will switch the EFI runtime services to virtual mode.
- * Essentially, we look through the EFI memmap and map every region that
- * has the runtime attribute bit set in its memory descriptor into the
- * ->trampoline_pgd page table using a top-down VA allocation scheme.
- *
- * The old method which used to update that memory descriptor with the
- * virtual address obtained from ioremap() is still supported when the
- * kernel is booted with efi=old_map on its command line. Same old
- * method enabled the runtime services to be called without having to
- * thunk back into physical mode for every invocation.
- *
- * The new method does a pagetable switch in a preemption-safe manner
- * so that we're in a different address space when calling a runtime
- * function. For function arguments passing we do copy the PGDs of the
- * kernel page table into ->trampoline_pgd prior to each call.
- */
-void __init efi_enter_virtual_mode(void)
+/* Merge contiguous regions of the same type and attribute */
+static void efi_merge_regions(void)
{
+ void *p;
efi_memory_desc_t *md, *prev_md = NULL;
- void *p, *new_memmap = NULL;
- unsigned long size;
- efi_status_t status;
- u64 end, systab;
- int count = 0;
-
- efi.systab = NULL;
-
- /*
- * We don't do virtual mode, since we don't do runtime services, on
- * non-native EFI
- */
- if (!efi_is_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) {
u64 prev_size;
md = p;
@@ -837,6 +805,18 @@ void __init efi_enter_virtual_mode(void)
prev_md = md;
}
+}
+
+/*
+ * Map efi memory ranges for runtime serivce
+ * Return the new memmap with updated virtual addrresses.
+ */
+static void efi_map_regions(void **new_memmap, int *count)
+{
+ efi_memory_desc_t *md;
+ void *p;
+ unsigned long size;
+ u64 end, systab;
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
md = p;
@@ -860,17 +840,59 @@ void __init efi_enter_virtual_mode(void)
efi.systab = (efi_system_table_t *) (unsigned long) systab;
}
- new_memmap = krealloc(new_memmap,
- (count + 1) * memmap.desc_size,
- GFP_KERNEL);
- if (!new_memmap)
+ *new_memmap = krealloc(*new_memmap,
+ (*count + 1) * memmap.desc_size,
+ GFP_KERNEL);
+ if (!*new_memmap)
goto err_out;
- memcpy(new_memmap + (count * memmap.desc_size), md,
+ memcpy(*new_memmap + (*count * memmap.desc_size), md,
memmap.desc_size);
- count++;
+ (*count)++;
}
+err_out:
+ pr_err("Error reallocating memory, EFI runtime non-functional!\n");
+}
+
+/*
+ * This function will switch the EFI runtime services to virtual mode.
+ * Essentially, we look through the EFI memmap and map every region that
+ * has the runtime attribute bit set in its memory descriptor into the
+ * ->trampoline_pgd page table using a top-down VA allocation scheme.
+ *
+ * The old method which used to update that memory descriptor with the
+ * virtual address obtained from ioremap() is still supported when the
+ * kernel is booted with efi=old_map on its command line. Same old
+ * method enabled the runtime services to be called without having to
+ * thunk back into physical mode for every invocation.
+ *
+ * The new method does a pagetable switch in a preemption-safe manner
+ * so that we're in a different address space when calling a runtime
+ * function. For function arguments passing we do copy the PGDs of the
+ * kernel page table into ->trampoline_pgd prior to each call.
+ */
+void __init efi_enter_virtual_mode(void)
+{
+ efi_status_t status;
+ void *p, *new_memmap = NULL;
+ int count = 0;
+
+ efi.systab = NULL;
+
+ /*
+ * We don't do virtual mode, since we don't do runtime services, on
+ * non-native EFI
+ */
+ if (!efi_is_native()) {
+ efi_unmap_memmap();
+ return;
+ }
+
+ efi_merge_regions();
+
+ efi_map_regions(&new_memmap, &count);
+
BUG_ON(!efi.systab);
efi_setup_page_tables();
@@ -922,9 +944,6 @@ void __init efi_enter_virtual_mode(void)
0, NULL);
return;
-
- err_out:
- pr_err("Error reallocating memory, EFI runtime non-functional!\n");
}
/*
--
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