[RFC PATCH 2/4] headers: introduce generalized boot info

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

The x86 and Arm architectures represent in memory the general boot information
and boot modules differently despite having commonality. The x86
representations are bound to the multiboot v1 structures while the Arm
representations are a slightly generalized meta-data container for the boot
material. The multiboot structure does not lend itself well to being expanded
to accommodate additional metadata, both general and boot module specific. The
Arm structures are not bound to an external specification and thus are able to
be expanded for solutions such as dom0less.

This commit introduces a set of structures patterned off the Arm structures to
represent the boot information in a manner that captures common data. The
structures provide an arch field to allow arch specific expansions to the
structures. The intended goal of these new common structures is to enable
commonality between the different architectures.  Specifically to enable
dom0less and hyperlaunch to have a common representation of boot-time
constructed domains.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/x86/include/asm/bootinfo.h | 45 ++++++++++++++++++++++++
 xen/include/xen/bootinfo.h          | 54 +++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 xen/arch/x86/include/asm/bootinfo.h
 create mode 100644 xen/include/xen/bootinfo.h

diff --git a/xen/arch/x86/include/asm/bootinfo.h 
b/xen/arch/x86/include/asm/bootinfo.h
new file mode 100644
index 0000000000..13e49f2b87
--- /dev/null
+++ b/xen/arch/x86/include/asm/bootinfo.h
@@ -0,0 +1,45 @@
+#ifndef __ARCH_X86_BOOTINFO_H__
+#define __ARCH_X86_BOOTINFO_H__
+
+/* unused for x86 */
+struct arch_bootstring { };
+
+struct __packed arch_bootmodule {
+#define BOOTMOD_FLAG_X86_RELOCATED      1U << 0
+    uint32_t flags;
+    uint32_t headroom;
+};
+
+struct __packed arch_boot_info {
+    uint32_t flags;
+#define BOOTINFO_FLAG_X86_MEMLIMITS    1U << 0
+#define BOOTINFO_FLAG_X86_BOOTDEV      1U << 1
+#define BOOTINFO_FLAG_X86_CMDLINE      1U << 2
+#define BOOTINFO_FLAG_X86_MODULES      1U << 3
+#define BOOTINFO_FLAG_X86_AOUT_SYMS    1U << 4
+#define BOOTINFO_FLAG_X86_ELF_SYMS     1U << 5
+#define BOOTINFO_FLAG_X86_MEMMAP       1U << 6
+#define BOOTINFO_FLAG_X86_DRIVES       1U << 7
+#define BOOTINFO_FLAG_X86_BIOSCONFIG   1U << 8
+#define BOOTINFO_FLAG_X86_LOADERNAME   1U << 9
+#define BOOTINFO_FLAG_X86_APM          1U << 10
+
+    char *boot_loader_name;
+
+    uint32_t mem_lower;
+    uint32_t mem_upper;
+
+    uint32_t mmap_length;
+    paddr_t mmap_addr;
+};
+
+struct __packed mb_memmap {
+    uint32_t size;
+    uint32_t base_addr_low;
+    uint32_t base_addr_high;
+    uint32_t length_low;
+    uint32_t length_high;
+    uint32_t type;
+};
+
+#endif
diff --git a/xen/include/xen/bootinfo.h b/xen/include/xen/bootinfo.h
new file mode 100644
index 0000000000..42b53a3ca6
--- /dev/null
+++ b/xen/include/xen/bootinfo.h
@@ -0,0 +1,54 @@
+#ifndef __XEN_BOOTINFO_H__
+#define __XEN_BOOTINFO_H__
+
+#include <xen/mm.h>
+#include <xen/types.h>
+
+#include <asm/bootinfo.h>
+
+typedef enum {
+    BOOTMOD_UNKNOWN,
+    BOOTMOD_XEN,
+    BOOTMOD_FDT,
+    BOOTMOD_KERNEL,
+    BOOTMOD_RAMDISK,
+    BOOTMOD_XSM,
+    BOOTMOD_UCODE,
+    BOOTMOD_GUEST_DTB,
+}  bootmodule_kind;
+
+typedef enum {
+    BOOTSTR_EMPTY,
+    BOOTSTR_STRING,
+    BOOTSTR_CMDLINE,
+} bootstring_kind;
+
+#define BOOTMOD_MAX_STRING 1024
+struct __packed boot_string {
+    bootstring_kind kind;
+    struct arch_bootstring *arch;
+
+    char bytes[BOOTMOD_MAX_STRING];
+    size_t len;
+};
+
+struct __packed boot_module {
+    bootmodule_kind kind;
+    paddr_t start;
+    mfn_t mfn;
+    size_t size;
+
+    struct arch_bootmodule *arch;
+    struct boot_string string;
+};
+
+struct __packed boot_info {
+    char *cmdline;
+
+    uint32_t nr_mods;
+    struct boot_module *mods;
+
+    struct arch_boot_info *arch;
+};
+
+#endif
-- 
2.20.1