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Date: Thu, 11 Sep 2008 09:13:33 -0500
From: Cliff Wickman <cpw@....com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu
Subject: [PATCH] x86: efi vendor_reserved memory type
From: Cliff Wickman <cpw@....com>
Add an EFI_VENDOR_RESERVED memory type.
This supports memory available only to special devices. Such memory will
not be used as general RAM by the OS.
And add a method for a device driver to locate that memory. The walk()
function scans the EFI memory map and does a callback to a specified
function for each memory area of a specified type.
efi_memmap_walk_vr() is made available for a module to scan for
type EFI_VENDOR_RESERVED.
A UV driver will be posted later that will use these routines.
Diffed against 2.6.27-rc1-mm1-dirty
Signed-off-by: Cliff Wickman <cpw@....com>
---
arch/x86/kernel/efi.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/efi.h | 3 ++-
2 files changed, 38 insertions(+), 1 deletion(-)
Index: linux/arch/x86/kernel/efi.c
===================================================================
--- linux.orig/arch/x86/kernel/efi.c
+++ linux/arch/x86/kernel/efi.c
@@ -568,3 +568,39 @@ u64 efi_mem_attributes(unsigned long phy
}
return 0;
}
+
+static void
+walk(efi_freemem_callback_t callback, void *arg, int type)
+{
+ efi_memory_desc_t *md;
+ void *p;
+ int size;
+
+ /*
+ * memmap.map is zeroed in efi_enter_virtual_mode()
+ * but we can use the physical address (phys_map)
+ */
+ size = memmap.nr_map*memmap.desc_size;
+ for (p = memmap.phys_map; p < memmap.phys_map+size;
+ p += memmap.desc_size) {
+ md = (efi_memory_desc_t *)__va(p);
+ if (md->type != type)
+ continue;
+ if ((*callback)(md->phys_addr,
+ md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
+ arg) < 0)
+ return;
+ }
+}
+
+/*
+ * Walk the EFI memory map and call "callback" once for each EFI memory
+ * descriptor of type VENDOR_RESERVED.
+ */
+void
+efi_memmap_walk_vr(efi_freemem_callback_t callback, void *arg)
+{
+ walk(callback, arg, EFI_VENDOR_RESERVED);
+}
+
+EXPORT_SYMBOL_GPL(efi_memmap_walk_vr);
Index: linux/include/linux/efi.h
===================================================================
--- linux.orig/include/linux/efi.h
+++ linux/include/linux/efi.h
@@ -77,7 +77,8 @@ typedef struct {
#define EFI_MEMORY_MAPPED_IO 11
#define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
#define EFI_PAL_CODE 13
-#define EFI_MAX_MEMORY_TYPE 14
+#define EFI_VENDOR_RESERVED 14
+#define EFI_MAX_MEMORY_TYPE 15
/* Attribute values: */
#define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
--
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