x86: Add a way to add to the e820 memory table
Some boards want to reserve extra regions of memory. Add a 'chosen'
property to support this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index faa819f..a76497d 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -12,6 +12,7 @@
#include <asm/mrccache.h>
#include <asm/mtrr.h>
#include <asm/post.h>
+#include <dm/ofnode.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -92,6 +93,8 @@
unsigned int num_entries = 0;
const struct hob_header *hdr;
struct hob_res_desc *res_desc;
+ const fdt64_t *prop;
+ int size;
hdr = gd->arch.hob_list;
@@ -133,6 +136,20 @@
num_entries++;
}
+ prop = ofnode_read_chosen_prop("e820-entries", &size);
+ if (prop) {
+ int count = size / (sizeof(u64) * 3);
+ int i;
+
+ if (num_entries + count >= max_entries)
+ return -ENOSPC;
+ for (i = 0; i < count; i++, num_entries++, prop += 3) {
+ entries[num_entries].addr = fdt64_to_cpu(prop[0]);
+ entries[num_entries].size = fdt64_to_cpu(prop[1]);
+ entries[num_entries].type = fdt64_to_cpu(prop[2]);
+ }
+ }
+
return num_entries;
}
diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt
index d4dfc05..e5ba672 100644
--- a/doc/device-tree-bindings/chosen.txt
+++ b/doc/device-tree-bindings/chosen.txt
@@ -143,3 +143,21 @@
node to add. The ACPI information is written in this order.
If the ordering does not include all nodes, an error is generated.
+
+e820-entries
+------------
+
+This provides a way to add entries to the e820 table which tells the OS about
+the memory map. The property contains three sets of 64-bit values:
+
+ address - Start address of region
+ size - Size of region
+ flags - Flags (E820_...)
+
+Example:
+
+chosen {
+ e820-entries = /bits/ 64 <
+ IOMAP_P2SB_BAR IOMAP P2SB_SIZE E820_RESERVED
+ MCH_BASE_ADDRESS MCH_SIZE E820_RESERVED>;
+};