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[v4,55/59] x86: Add a way to add to the e820 memory table

Message ID 20200922124521.v4.55.I76d2863227979dc3dd80af26759ff2ef51dc5553@changeid
State Accepted
Commit 70c202c480b8dadd27dbfb723f0cede1fb0e0d0c
Delegated to: Bin Meng
Headers show
Series dm: Add programatic generation of ACPI tables (part D) | expand

Commit Message

Simon Glass Sept. 22, 2020, 6:45 p.m. UTC 
Some boards want to reserve extra regions of memory. Add a 'chosen'
property to support this.

Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

 arch/x86/lib/fsp/fsp_dram.c         | 17 +++++++++++++++++
 doc/device-tree-bindings/chosen.txt | 18 ++++++++++++++++++
 2 files changed, 35 insertions(+)
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Patch

diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index faa819fab4b..a76497d4e01 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 install_e820_map(unsigned int max_entries,
 	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 @@  unsigned int install_e820_map(unsigned int max_entries,
 		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 d4dfc05847b..e5ba6720ce1 100644
--- a/doc/device-tree-bindings/chosen.txt
+++ b/doc/device-tree-bindings/chosen.txt
@@ -143,3 +143,21 @@  This provides the ordering to use when writing device data to the ACPI SSDT
 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>;
+};