add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/xen/interface/hvm/start_info.h
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@@ -33,7 +33,7 @@
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  *    | magic          | Contains the magic value XEN_HVM_START_MAGIC_VALUE
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  *    |                | ("xEn3" with the 0x80 bit of the "E" set).
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  *  4 +----------------+
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- *    | version        | Version of this structure. Current version is 0. New
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+ *    | version        | Version of this structure. Current version is 1. New
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  *    |                | versions are guaranteed to be backwards-compatible.
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  *  8 +----------------+
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  *    | flags          | SIF_xxx flags.
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@@ -48,6 +48,15 @@
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  * 32 +----------------+
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  *    | rsdp_paddr     | Physical address of the RSDP ACPI data structure.
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  * 40 +----------------+
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+ *    | memmap_paddr   | Physical address of the (optional) memory map. Only
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+ *    |                | present in version 1 and newer of the structure.
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+ * 48 +----------------+
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+ *    | memmap_entries | Number of entries in the memory map table. Zero
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+ *    |                | if there is no memory map being provided. Only
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+ *    |                | present in version 1 and newer of the structure.
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+ * 52 +----------------+
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+ *    | reserved       | Version 1 and newer only.
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+ * 56 +----------------+
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  *
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  * The layout of each entry in the module structure is the following:
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  *
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@@ -62,12 +71,50 @@
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  *    | reserved       |
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  * 32 +----------------+
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  *
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+ * The layout of each entry in the memory map table is as follows:
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+ *
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+ *  0 +----------------+
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+ *    | addr           | Base address
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+ *  8 +----------------+
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+ *    | size           | Size of mapping in bytes
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+ * 16 +----------------+
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+ *    | type           | Type of mapping as defined between the hypervisor
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+ *    |                | and guest. See XEN_HVM_MEMMAP_TYPE_* values below.
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+ * 20 +----------------|
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+ *    | reserved       |
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+ * 24 +----------------+
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+ *
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  * The address and sizes are always a 64bit little endian unsigned integer.
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  *
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  * NB: Xen on x86 will always try to place all the data below the 4GiB
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  * boundary.
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+ *
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+ * Version numbers of the hvm_start_info structure have evolved like this:
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+ *
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+ * Version 0:  Initial implementation.
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+ *
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+ * Version 1:  Added the memmap_paddr/memmap_entries fields (plus 4 bytes of
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+ *             padding) to the end of the hvm_start_info struct. These new
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+ *             fields can be used to pass a memory map to the guest. The
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+ *             memory map is optional and so guests that understand version 1
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+ *             of the structure must check that memmap_entries is non-zero
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+ *             before trying to read the memory map.
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  */
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 #define XEN_HVM_START_MAGIC_VALUE 0x336ec578
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+
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+/*
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+ * The values used in the type field of the memory map table entries are
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+ * defined below and match the Address Range Types as defined in the "System
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+ * Address Map Interfaces" section of the ACPI Specification. Please refer to
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+ * section 15 in version 6.2 of the ACPI spec: http://uefi.org/specifications
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+ */
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+#define XEN_HVM_MEMMAP_TYPE_RAM       1
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+#define XEN_HVM_MEMMAP_TYPE_RESERVED  2
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+#define XEN_HVM_MEMMAP_TYPE_ACPI      3
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+#define XEN_HVM_MEMMAP_TYPE_NVS       4
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+#define XEN_HVM_MEMMAP_TYPE_UNUSABLE  5
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+#define XEN_HVM_MEMMAP_TYPE_DISABLED  6
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+#define XEN_HVM_MEMMAP_TYPE_PMEM      7
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 /*
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  * C representation of the x86/HVM start info layout.
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@@ -86,6 +133,13 @@
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     uint64_t cmdline_paddr;     /* Physical address of the command line.     */
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     uint64_t rsdp_paddr;        /* Physical address of the RSDP ACPI data    */
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                                 /* structure.                                */
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+    /* All following fields only present in version 1 and newer */
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+    uint64_t memmap_paddr;      /* Physical address of an array of           */
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+                                /* hvm_memmap_table_entry.                   */
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+    uint32_t memmap_entries;    /* Number of entries in the memmap table.    */
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+                                /* Value will be zero if there is no memory  */
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+                                /* map being provided.                       */
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+    uint32_t reserved;          /* Must be zero.                             */
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 };
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 struct hvm_modlist_entry {
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@@ -95,4 +149,11 @@
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     uint64_t reserved;
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 };
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+struct hvm_memmap_table_entry {
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+    uint64_t addr;              /* Base address of the memory region         */
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+    uint64_t size;              /* Size of the memory region in bytes        */
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+    uint32_t type;              /* Mapping type                              */
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+    uint32_t reserved;          /* Must be zero for Version 1.               */
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+};
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+
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 #endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */