first commit

Based on x86/bios from lkvm

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/include/e820.h b/include/e820.h
new file mode 100644
index 0000000..1dfd18f
--- /dev/null
+++ b/include/e820.h
@@ -0,0 +1,66 @@
+#ifndef _UAPI_ASM_X86_E820_H
+#define _UAPI_ASM_X86_E820_H
+
+#define SMAP    0x534d4150	/* ASCII "SMAP" */
+#define E820MAP	0x2d0		/* our map */
+#define E820MAX	128		/* number of entries in E820MAP */
+
+/*
+ * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
+ * constrained space in the zeropage.  If we have more nodes than
+ * that, and if we've booted off EFI firmware, then the EFI tables
+ * passed us from the EFI firmware can list more nodes.  Size our
+ * internal memory map tables to have room for these additional
+ * nodes, based on up to three entries per node for which the
+ * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
+ * plus E820MAX, allowing space for the possible duplicate E820
+ * entries that might need room in the same arrays, prior to the
+ * call to sanitize_e820_map() to remove duplicates.  The allowance
+ * of three memory map entries per node is "enough" entries for
+ * the initial hardware platform motivating this mechanism to make
+ * use of additional EFI map entries.  Future platforms may want
+ * to allow more than three entries per node or otherwise refine
+ * this size.
+ */
+
+#define E820_X_MAX E820MAX
+
+#define E820NR	0x1e8		/* # entries in E820MAP */
+
+#define E820_RAM	1
+#define E820_RESERVED	2
+#define E820_ACPI	3
+#define E820_NVS	4
+#define E820_UNUSABLE	5
+
+
+/*
+ * reserved RAM used by kernel itself
+ * if CONFIG_INTEL_TXT is enabled, memory of this type will be
+ * included in the S3 integrity calculation and so should not include
+ * any memory that BIOS might alter over the S3 transition
+ */
+#define E820_RESERVED_KERN        128
+
+struct e820entry {
+	uint64_t addr;	/* start of memory segment */
+	uint64_t size;	/* size of memory segment */
+	uint32_t type;	/* type of memory segment */
+} __attribute__((packed));
+
+struct e820map {
+	uint32_t nr_map;
+	struct e820entry map[E820_X_MAX];
+};
+
+#define ISA_START_ADDRESS	0xa0000
+#define ISA_END_ADDRESS		0x100000
+
+#define BIOS_BEGIN		0x000a0000
+#define BIOS_END		0x00100000
+
+#define BIOS_ROM_BASE		0xffe00000
+#define BIOS_ROM_END		0xffffffff
+
+
+#endif /* _UAPI_ASM_X86_E820_H */