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[Xen-devel] [PATCH for-4.5 V8 4/4] Add ARM EFI boot support



This patch adds EFI boot support for ARM based on the previous refactoring of
the x86 EFI boot code.  All ARM specific code is in the ARM efi-boot.h header
file, with the main EFI entry point common/efi/boot.c.  The PE/COFF header is
open-coded in head.S, which allows us to have a single binary be both an EFI
executable and a normal arm64 IMAGE file. There is currently no PE/COFF
toolchain support for arm64, so it is not possible to create the PE/COFF header
in the same manner as on x86.  This also simplifies the build as compared to
x86, as we always build the same executable, whereas x86 builds 2.  An ARM
version of efi-bind.h is added, which is based on the x86_64 version with the
x86 specific portions removed.  The Makefile in common/efi is different for x86
and ARM, as for ARM we always build in EFI support.
NR_MEM_BANKS is increased, as memory regions are now added from the UEFI memory 
map,
rather than memory banks from a DTB.  The UEFI memory map may be fragmented so 
a larger
number of regions will be used.

Signed-off-by: Roy Franz <roy.franz@xxxxxxxxxx>
---
 xen/arch/arm/Makefile               |   1 +
 xen/arch/arm/arm64/head.S           | 150 +++++++++-
 xen/arch/arm/efi/Makefile           |   4 +
 xen/arch/arm/efi/efi-boot.h         | 575 ++++++++++++++++++++++++++++++++++++
 xen/arch/arm/xen.lds.S              |   1 +
 xen/common/efi/boot.c               |  17 +-
 xen/common/efi/efi.h                |   2 +
 xen/common/efi/runtime.c            |  16 +-
 xen/include/asm-arm/arm64/efibind.h | 216 ++++++++++++++
 xen/include/asm-arm/efibind.h       |   2 +
 xen/include/asm-arm/setup.h         |   2 +-
 11 files changed, 977 insertions(+), 9 deletions(-)
 create mode 100644 xen/arch/arm/efi/Makefile
 create mode 100644 xen/arch/arm/efi/efi-boot.h
 create mode 100644 xen/include/asm-arm/arm64/efibind.h
 create mode 100644 xen/include/asm-arm/efibind.h

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index e557cac..f330302 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -1,6 +1,7 @@
 subdir-$(arm32) += arm32
 subdir-$(arm64) += arm64
 subdir-y += platforms
+subdir-$(arm64) += efi
 
 obj-$(EARLY_PRINTK) += early_printk.o
 obj-y += cpu.o
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index d22af1c..7650abe 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -24,6 +24,8 @@
 #include <asm/page.h>
 #include <asm/asm_defns.h>
 #include <asm/early_printk.h>
+#include <efi/efierr.h>
+#include <asm/arm64/efibind.h>
 
 #define PT_PT     0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
 #define PT_MEM    0xf7d /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=0 P=1 */
@@ -104,8 +106,14 @@ GLOBAL(start)
         /*
          * DO NOT MODIFY. Image header expected by Linux boot-loaders.
          */
-        b       real_start           /* branch to kernel start, magic */
-        .long   0                    /* reserved */
+efi_head:
+        /*
+         * This add instruction has no meaningful effect except that
+         * its opcode forms the magic "MZ" signature of a PE/COFF file
+         * that is required for UEFI applications.
+         */
+        add     x13, x18, #0x16
+        b       real_start           /* branch to kernel start */
         .quad   0                    /* Image load offset from start of RAM */
         .quad   0                    /* reserved */
         .quad   0                    /* reserved */
@@ -116,8 +124,113 @@ GLOBAL(start)
         .byte   0x52
         .byte   0x4d
         .byte   0x64
-        .word   0                    /* reserved */
+        .long   pe_header - efi_head        /* Offset to the PE header. */
+
+        /*
+         * Add the PE/COFF header to the file.  The address of this header
+         * is at offset 0x3c in the file, and is part of Linux "Image"
+         * header.  The arm64 Linux Image format is designed to support
+         * being both an 'Image' format binary and a PE/COFF binary.
+         * The PE/COFF format is defined by Microsoft, and is available
+         * from: http://msdn.microsoft.com/en-us/gg463119.aspx
+         * Version 8.3 adds support for arm64 and UEFI usage.
+         */
+
+        .align  3
+pe_header:
+        .ascii  "PE"
+        .short  0
+coff_header:
+        .short  0xaa64                          /* AArch64 */
+        .short  2                               /* nr_sections */
+        .long   0                               /* TimeDateStamp */
+        .long   0                               /* PointerToSymbolTable */
+        .long   1                               /* NumberOfSymbols */
+        .short  section_table - optional_header /* SizeOfOptionalHeader */
+        .short  0x206                           /* Characteristics. */
+                                                /* IMAGE_FILE_DEBUG_STRIPPED | 
*/
+                                                /* IMAGE_FILE_EXECUTABLE_IMAGE 
| */
+                                                /* 
IMAGE_FILE_LINE_NUMS_STRIPPED */
+optional_header:
+        .short  0x20b                           /* PE32+ format */
+        .byte   0x02                            /* MajorLinkerVersion */
+        .byte   0x14                            /* MinorLinkerVersion */
+        .long   _end - real_start               /* SizeOfCode */
+        .long   0                               /* SizeOfInitializedData */
+        .long   0                               /* SizeOfUninitializedData */
+        .long   efi_start - efi_head            /* AddressOfEntryPoint */
+        .long   real_start - efi_head           /* BaseOfCode */
+
+extra_header_fields:
+        .quad   0                               /* ImageBase */
+        .long   0x1000                          /* SectionAlignment (4 KByte) 
*/
+        .long   0x8                             /* FileAlignment */
+        .short  0                               /* MajorOperatingSystemVersion 
*/
+        .short  0                               /* MinorOperatingSystemVersion 
*/
+        .short  0                               /* MajorImageVersion */
+        .short  0                               /* MinorImageVersion */
+        .short  0                               /* MajorSubsystemVersion */
+        .short  0                               /* MinorSubsystemVersion */
+        .long   0                               /* Win32VersionValue */
+
+        .long   _end - efi_head                 /* SizeOfImage */
+
+        /* Everything before the kernel image is considered part of the header 
*/
+        .long   real_start - efi_head           /* SizeOfHeaders */
+        .long   0                               /* CheckSum */
+        .short  0xa                             /* Subsystem (EFI application) 
*/
+        .short  0                               /* DllCharacteristics */
+        .quad   0                               /* SizeOfStackReserve */
+        .quad   0                               /* SizeOfStackCommit */
+        .quad   0                               /* SizeOfHeapReserve */
+        .quad   0                               /* SizeOfHeapCommit */
+        .long   0                               /* LoaderFlags */
+        .long   0x6                             /* NumberOfRvaAndSizes */
+
+        .quad   0                               /* ExportTable */
+        .quad   0                               /* ImportTable */
+        .quad   0                               /* ResourceTable */
+        .quad   0                               /* ExceptionTable */
+        .quad   0                               /* CertificationTable */
+        .quad   0                               /* BaseRelocationTable */
+
+        /* Section table */
+section_table:
 
+        /*
+         * The EFI application loader requires a relocation section
+         * because EFI applications must be relocatable.  This is a
+         * dummy section as far as we are concerned.
+         */
+        .ascii  ".reloc"
+        .byte   0
+        .byte   0                               /* end of 0 padding of section 
name */
+        .long   0
+        .long   0
+        .long   0                               /* SizeOfRawData */
+        .long   0                               /* PointerToRawData */
+        .long   0                               /* PointerToRelocations */
+        .long   0                               /* PointerToLineNumbers */
+        .short  0                               /* NumberOfRelocations */
+        .short  0                               /* NumberOfLineNumbers */
+        .long   0x42100040                      /* Characteristics (section 
flags) */
+
+
+        .ascii  ".text"
+        .byte   0
+        .byte   0
+        .byte   0                               /* end of 0 padding of section 
name */
+        .long   _end - real_start               /* VirtualSize */
+        .long   real_start - efi_head           /* VirtualAddress */
+        .long   __init_end_efi - real_start     /* SizeOfRawData */
+        .long   real_start - efi_head           /* PointerToRawData */
+
+        .long   0                /* PointerToRelocations (0 for executables) */
+        .long   0                /* PointerToLineNumbers (0 for executables) */
+        .short  0                /* NumberOfRelocations  (0 for executables) */
+        .short  0                /* NumberOfLineNumbers  (0 for executables) */
+        .long   0xe0500020       /* Characteristics (section flags) */
+        .align  5
 real_start:
         msr   DAIFSet, 0xf           /* Disable all interrupts */
 
@@ -621,6 +734,37 @@ putn:   ret
 ENTRY(lookup_processor_type)
         mov  x0, #0
         ret
+/*
+ *  Function to transition from EFI loader in C, to Xen entry point.
+ *  void noreturn efi_xen_start(void *fdt_ptr);
+ */
+ENTRY(efi_xen_start)
+        /*
+         * Turn off cache and MMU as Xen expects. EFI enables them, but also
+         * mandates a 1:1 (unity) VA->PA mapping, so we can turn off the
+         * MMU while executing EFI code before entering Xen.
+         * The EFI loader calls this to start Xen.
+         * Preserve x0 (fdf pointer) across call to __flush_dcache_all,
+         * restore for entry into Xen.
+         */
+        mov   x20, x0
+        bl    __flush_dcache_all
+        ic    ialluis
+
+        /* Turn off Dcache and MMU */
+        mrs   x0, sctlr_el2
+        bic   x0, x0, #1 << 0        /* clear SCTLR.M */
+        bic   x0, x0, #1 << 2        /* clear SCTLR.C */
+        msr   sctlr_el2, x0
+        isb
+
+        /* Jump to Xen entry point */
+        mov   x0, x20
+        mov   x1, xzr
+        mov   x2, xzr
+        mov   x3, xzr
+        b     real_start
+ENDPROC(efi_xen_start)
 
 /*
  * Local variables:
diff --git a/xen/arch/arm/efi/Makefile b/xen/arch/arm/efi/Makefile
new file mode 100644
index 0000000..e8a93e3
--- /dev/null
+++ b/xen/arch/arm/efi/Makefile
@@ -0,0 +1,4 @@
+CFLAGS += -fshort-wchar
+
+obj-y +=  boot.init.o runtime.o
+
diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
new file mode 100644
index 0000000..61cb13a
--- /dev/null
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -0,0 +1,575 @@
+/*
+ * Architecture specific implementation for EFI boot code.  This file
+ * is intended to be included by common/efi/boot.c _only_, and
+ * therefore can define arch specific global variables.
+ */
+#include <xen/device_tree.h>
+#include <xen/libfdt/libfdt.h>
+#include <asm/setup.h>
+
+void noreturn efi_xen_start(void *fdt_ptr);
+
+#define DEVICE_TREE_GUID \
+{0xb1b621d5, 0xf19c, 0x41a5, {0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0}}
+
+static struct file __initdata dtbfile;
+static void __initdata *fdt;
+static void __initdata *memmap;
+
+static int __init setup_chosen_node(void *fdt, int *addr_cells, int 
*size_cells)
+{
+    int node;
+    const struct fdt_property *prop;
+    int len;
+    uint32_t val;
+
+    if ( !fdt || !addr_cells || !size_cells )
+        return -1;
+
+    /* locate chosen node, which is where we add Xen module info. */
+    node = fdt_subnode_offset(fdt, 0, "chosen");
+    if ( node < 0 )
+    {
+        node = fdt_add_subnode(fdt, 0, "chosen");
+        if ( node < 0 )
+            return node;
+    }
+
+    /* Get or set #address-cells and #size-cells */
+    prop = fdt_get_property(fdt, node, "#address-cells", &len);
+    if ( !prop )
+    {
+        val = cpu_to_fdt32(2);
+        if ( fdt_setprop(fdt, node, "#address-cells", &val, sizeof(val)) )
+            return -1;
+        *addr_cells = 2;
+    }
+    else
+        *addr_cells = fdt32_to_cpu(*((uint32_t *)prop->data));
+
+    prop = fdt_get_property(fdt, node, "#size-cells", &len);
+    if ( !prop )
+    {
+        val = cpu_to_fdt32(2);
+        if ( fdt_setprop(fdt, node, "#size-cells", &val, sizeof(val)) )
+            return -1;
+        *size_cells = 2;
+    }
+    else
+        *size_cells = fdt32_to_cpu(*((uint32_t *)prop->data));
+
+    /*
+     * Make sure ranges is empty if it exists, otherwise create empty ranges
+     * property.
+     */
+    prop = fdt_get_property(fdt, node, "ranges", &len);
+    if ( !prop )
+    {
+        val = cpu_to_fdt32(0);
+        if ( fdt_setprop(fdt, node, "ranges", &val, 0) )
+            return -1;
+    }
+    else if ( fdt32_to_cpu(prop->len) )
+            return -1;  /* Non-empty ranges property */
+    return node;
+}
+
+/*
+ * Set a single 'reg' property taking into account the
+ * configured addr and size cell sizes.
+ */
+static int __init fdt_set_reg(void *fdt, int node, int addr_cells,
+                              int size_cells, uint64_t addr, uint64_t len)
+{
+    __be32 val[4]; /* At most 2 64 bit values to be stored */
+    __be32 *cellp;
+
+    /*
+     * Make sure that the values provided can be represented in
+     * the reg property, and sizes are valid.
+     */
+    if ( addr_cells < 1 || addr_cells > 2 || size_cells < 1 || size_cells > 2 )
+        return -1;
+    if ( addr_cells == 1 && (addr >> 32) )
+        return -1;
+    if ( size_cells == 1 && (len >> 32) )
+        return -1;
+
+    cellp = (__be32 *)val;
+    dt_set_cell(&cellp, addr_cells, addr);
+    dt_set_cell(&cellp, size_cells, len);
+
+    return(fdt_setprop(fdt, node, "reg", val, sizeof(*cellp) * (cellp - val)));
+}
+
+static void __init *lookup_fdt_config_table(EFI_SYSTEM_TABLE *sys_table)
+{
+    const EFI_GUID fdt_guid = DEVICE_TREE_GUID;
+    EFI_CONFIGURATION_TABLE *tables;
+    void *fdt = NULL;
+    int i;
+
+    tables = sys_table->ConfigurationTable;
+    for ( i = 0; i < sys_table->NumberOfTableEntries; i++ )
+    {
+        if ( match_guid(&tables[i].VendorGuid, &fdt_guid) )
+        {
+            fdt = tables[i].VendorTable;
+            break;
+        }
+    }
+    return fdt;
+}
+
+static EFI_STATUS __init efi_process_memory_map_bootinfo(EFI_MEMORY_DESCRIPTOR 
*map,
+                                                UINTN mmap_size,
+                                                UINTN desc_size)
+{
+    int Index;
+    int i = 0;
+    EFI_MEMORY_DESCRIPTOR *desc_ptr = map;
+
+    for ( Index = 0; Index < (mmap_size / desc_size); Index++ )
+    {
+        if ( desc_ptr->Type == EfiConventionalMemory
+             || desc_ptr->Type == EfiBootServicesCode
+             || desc_ptr->Type == EfiBootServicesData )
+        {
+            bootinfo.mem.bank[i].start = desc_ptr->PhysicalStart;
+            bootinfo.mem.bank[i].size = desc_ptr->NumberOfPages * 
EFI_PAGE_SIZE;
+            if ( ++i >= NR_MEM_BANKS )
+            {
+                PrintStr(L"Warning: All ");
+                DisplayUint(NR_MEM_BANKS, -1);
+                PrintStr(L" bootinfo mem banks exhausted.\r\n");
+                break;
+            }
+        }
+        desc_ptr = NextMemoryDescriptor(desc_ptr, desc_size);
+    }
+
+    bootinfo.mem.nr_banks = i;
+    return EFI_SUCCESS;
+}
+
+/*
+ * Add the FDT nodes for the standard EFI information, which consist
+ * of the System table address, the address of the final EFI memory map,
+ * and memory map information.
+ */
+EFI_STATUS __init fdt_add_uefi_nodes(EFI_SYSTEM_TABLE *sys_table,
+                                            void *fdt,
+                                            EFI_MEMORY_DESCRIPTOR *memory_map,
+                                            UINTN map_size,
+                                            UINTN desc_size,
+                                            UINT32 desc_ver)
+{
+    int node;
+    int status;
+    u32 fdt_val32;
+    u64 fdt_val64;
+    int prev;
+    int num_rsv;
+
+    /*
+     * Delete any memory nodes present.  The EFI memory map is the only
+     * memory description provided to Xen.
+     */
+    prev = 0;
+    for (;;)
+    {
+        const char *type;
+        int len;
+
+        node = fdt_next_node(fdt, prev, NULL);
+        if ( node < 0 )
+            break;
+
+        type = fdt_getprop(fdt, node, "device_type", &len);
+        if ( type && strncmp(type, "memory", len) == 0 )
+        {
+            fdt_del_node(fdt, node);
+            continue;
+        }
+
+        prev = node;
+    }
+
+   /*
+    * Delete all memory reserve map entries. When booting via UEFI,
+    * kernel will use the UEFI memory map to find reserved regions.
+    */
+   num_rsv = fdt_num_mem_rsv(fdt);
+   while ( num_rsv-- > 0 )
+       fdt_del_mem_rsv(fdt, num_rsv);
+
+    /* Add FDT entries for EFI runtime services in chosen node. */
+    node = fdt_subnode_offset(fdt, 0, "chosen");
+    if ( node < 0 )
+    {
+        node = fdt_add_subnode(fdt, 0, "chosen");
+        if ( node < 0 )
+        {
+            status = node; /* node is error code when negative */
+            goto fdt_set_fail;
+        }
+    }
+
+    fdt_val64 = cpu_to_fdt64((u64)(uintptr_t)sys_table);
+    status = fdt_setprop(fdt, node, "linux,uefi-system-table",
+                         &fdt_val64, sizeof(fdt_val64));
+    if ( status )
+        goto fdt_set_fail;
+
+    fdt_val64 = cpu_to_fdt64((u64)(uintptr_t)memory_map);
+    status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
+                         &fdt_val64,  sizeof(fdt_val64));
+    if ( status )
+        goto fdt_set_fail;
+
+    fdt_val32 = cpu_to_fdt32(map_size);
+    status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
+                         &fdt_val32,  sizeof(fdt_val32));
+    if ( status )
+        goto fdt_set_fail;
+
+    fdt_val32 = cpu_to_fdt32(desc_size);
+    status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
+                         &fdt_val32, sizeof(fdt_val32));
+    if ( status )
+        goto fdt_set_fail;
+
+    fdt_val32 = cpu_to_fdt32(desc_ver);
+    status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
+                         &fdt_val32, sizeof(fdt_val32));
+    if ( status )
+        goto fdt_set_fail;
+
+    return EFI_SUCCESS;
+
+fdt_set_fail:
+    if ( status == -FDT_ERR_NOSPACE )
+        return EFI_BUFFER_TOO_SMALL;
+
+    return EFI_LOAD_ERROR;
+}
+
+/*
+ * Allocates new memory for a larger FDT, and frees existing memory if
+ * struct file size is non-zero.  Updates file struct with new memory
+ * address/size for later freeing.  If fdtfile.ptr is NULL, an empty FDT
+ * is created.
+ */
+static void __init *fdt_increase_size(struct file *fdtfile, int add_size)
+{
+    EFI_STATUS status;
+    EFI_PHYSICAL_ADDRESS fdt_addr;
+    int fdt_size;
+    int pages;
+    void *new_fdt;
+
+    if ( fdtfile->ptr )
+        fdt_size = fdt_totalsize(fdtfile->ptr);
+    else
+        fdt_size = 0;
+
+    pages = PFN_UP(fdt_size + add_size);
+    status = efi_bs->AllocatePages(AllocateAnyPages, EfiLoaderData,
+                                   pages, &fdt_addr);
+
+    if ( status != EFI_SUCCESS )
+        return NULL;
+
+    new_fdt = (void *)fdt_addr;
+
+    if ( fdt_size )
+    {
+        if ( fdt_open_into(dtbfile.ptr, new_fdt, pages * EFI_PAGE_SIZE) )
+            return NULL;
+    }
+    else
+    {
+        /*
+         * Create an empty FDT if not provided one, which is the expected case
+         * when booted from the UEFI shell on an ACPI only system.  We will use
+         * the FDT to pass the EFI information to Xen, as well as nodes for
+         * any modules the stub loads.  The ACPI tables are part of the UEFI
+         * system table that is passed in the FDT.
+         */
+        if ( fdt_create_empty_tree(new_fdt, pages * EFI_PAGE_SIZE) )
+            return NULL;
+    }
+
+    /*
+     * Now that we have the new FDT allocated and copied, free the
+     * original and update the struct file so that the error handling
+     * code will free it.  If the original FDT came from a configuration
+     * table, we don't own that memory and can't free it.
+     */
+    if ( dtbfile.size )
+        efi_bs->FreePages(dtbfile.addr, PFN_UP(dtbfile.size));
+
+    /* Update 'file' info for new memory so we clean it up on error exits */
+    dtbfile.addr = fdt_addr;
+    dtbfile.size = pages * EFI_PAGE_SIZE;
+    return new_fdt;
+}
+
+static void __init efi_arch_relocate_image(unsigned long delta)
+{
+}
+
+static void __init efi_arch_process_memory_map(EFI_SYSTEM_TABLE *SystemTable,
+                                               void *map,
+                                               UINTN map_size,
+                                               UINTN desc_size,
+                                               UINT32 desc_ver)
+{
+    EFI_STATUS status;
+
+    status = efi_process_memory_map_bootinfo(map, map_size, desc_size);
+    if ( EFI_ERROR(status) )
+        blexit(L"EFI memory map processing failed");
+
+    status = fdt_add_uefi_nodes(SystemTable, fdt, map, map_size, desc_size,
+                                desc_ver);
+    if ( EFI_ERROR(status) )
+        PrintErrMesg(L"Updating FDT failed\r\n", status);
+}
+
+static void __init efi_arch_pre_exit_boot(void)
+{
+}
+
+static void __init efi_arch_post_exit_boot(void)
+{
+    efi_xen_start(fdt);
+}
+
+static void __init efi_arch_cfg_file_early(EFI_FILE_HANDLE dir_handle, char 
*section)
+{
+    union string name;
+
+    /*
+     * The DTB must be processed before any other entries in the configuration
+     * file, as the DTB is updated as modules are loaded.
+     */
+    name.s = get_value(&cfg, section, "dtb");
+    if ( name.s )
+    {
+        split_string(name.s);
+        read_file(dir_handle, s2w(&name), &dtbfile, NULL);
+            blexit(NULL);
+        efi_bs->FreePool(name.w);
+    }
+    fdt = fdt_increase_size(&dtbfile, cfg.size + EFI_PAGE_SIZE);
+    if ( !fdt )
+        blexit(L"Unable to create new FDT");
+}
+
+static void __init efi_arch_cfg_file_late(EFI_FILE_HANDLE dir_handle, char 
*section)
+{
+}
+
+static void *__init efi_arch_allocate_mmap_buffer(UINTN map_size)
+{
+    void *ptr;
+    EFI_STATUS status;
+
+    status = efi_bs->AllocatePool(EfiLoaderData, map_size + EFI_PAGE_SIZE, 
&ptr);
+    if ( status != EFI_SUCCESS )
+        return NULL;
+    return ptr;
+}
+
+static void __init efi_arch_edd(void)
+{
+}
+
+static void __init efi_arch_memory_setup(void)
+{
+}
+
+static void __init efi_arch_handle_cmdline(CHAR16 *image_name,
+                                           CHAR16 *cmdline_options,
+                                           char *cfgfile_options)
+{
+    union string name;
+    char *buf;
+    EFI_STATUS status;
+    int prop_len;
+    int chosen;
+
+    /* locate chosen node, which is where we add Xen module info. */
+    chosen = fdt_subnode_offset(fdt, 0, "chosen");
+    if ( chosen < 0 )
+        blexit(L"Unable to find chosen node");
+
+    status = efi_bs->AllocatePool(EfiBootServicesData, EFI_PAGE_SIZE, (void 
**)&buf);
+    if ( EFI_ERROR(status) )
+        PrintErrMesg(L"Unable to allocate string buffer\r\n", status);
+
+    if ( image_name )
+    {
+        name.w = image_name;
+        w2s(&name);
+    }
+    else
+        name.s = "xen";
+
+    prop_len = 0;
+    prop_len += snprintf(buf + prop_len,
+                           EFI_PAGE_SIZE - prop_len, "%s", name.s);
+    if ( prop_len >= EFI_PAGE_SIZE )
+        blexit(L"FDT string overflow");
+
+    if ( cfgfile_options )
+    {
+        prop_len += snprintf(buf + prop_len,
+                               EFI_PAGE_SIZE - prop_len, " %s", 
cfgfile_options);
+        if ( prop_len >= EFI_PAGE_SIZE )
+            blexit(L"FDT string overflow");
+    }
+
+    if ( cmdline_options )
+    {
+        name.w = cmdline_options;
+        w2s(&name);
+    }
+    else
+        name.s = NULL;
+
+    if ( name.s )
+    {
+        prop_len += snprintf(buf + prop_len,
+                               EFI_PAGE_SIZE - prop_len, " %s", name.s);
+        if ( prop_len >= EFI_PAGE_SIZE )
+            blexit(L"FDT string overflow");
+    }
+
+    if ( fdt_setprop_string(fdt, chosen, "xen,xen-bootargs", buf) < 0 )
+        blexit(L"Unable to set xen,xen-bootargs property.");
+
+    efi_bs->FreePool(buf);
+}
+
+static void __init efi_arch_handle_module(struct file *file, const CHAR16 
*name,
+                                          char *options)
+{
+    int node;
+    int chosen;
+    int addr_len, size_len;
+
+    if ( file == &dtbfile )
+        return;
+    chosen = setup_chosen_node(fdt, &addr_len, &size_len);
+    if ( chosen < 0 )
+        blexit(L"Unable to setup chosen node");
+
+    if ( file == &ramdisk )
+    {
+        char ramdisk_compat[] = "multiboot,ramdisk\0multiboot,module";
+        node = fdt_add_subnode(fdt, chosen, "ramdisk");
+        if ( node < 0 )
+            blexit(L"Unable to add ramdisk FDT node.");
+        if ( fdt_setprop(fdt, node, "compatible", ramdisk_compat,
+                         sizeof(ramdisk_compat)) < 0 )
+            blexit(L"Unable to set compatible property.");
+        if ( fdt_set_reg(fdt, node, addr_len, size_len, ramdisk.addr,
+                    ramdisk.size) < 0 )
+            blexit(L"Unable to set reg property.");
+    }
+    else if ( file == &xsm )
+    {
+        char xsm_compat[] = "xen,xsm-policy\0multiboot,module";
+        node = fdt_add_subnode(fdt, chosen, "xsm");
+        if ( node < 0 )
+            blexit(L"Unable to add xsm FDT node.");
+        if ( fdt_setprop(fdt, node, "compatible", xsm_compat,
+                         sizeof(xsm_compat)) < 0 )
+            blexit(L"Unable to set compatible property.");
+        if ( fdt_set_reg(fdt, node, addr_len, size_len, xsm.addr,
+                    xsm.size) < 0 )
+            blexit(L"Unable to set reg property.");
+    }
+    else if ( file == &kernel )
+    {
+        char kernel_compat[] = "multiboot,kernel\0multiboot,module";
+        node = fdt_add_subnode(fdt, chosen, "kernel");
+        if ( node < 0 )
+            blexit(L"Unable to add dom0 FDT node.");
+        if ( fdt_setprop(fdt, node, "compatible", kernel_compat,
+                         sizeof(kernel_compat)) < 0 )
+            blexit(L"Unable to set compatible property.");
+        if ( options && fdt_setprop_string(fdt, node, "bootargs", options) < 0 
)
+            blexit(L"Unable to set bootargs property.");
+        if ( fdt_set_reg(fdt, node, addr_len, size_len, kernel.addr,
+                         kernel.size) < 0 )
+            blexit(L"Unable to set reg property.");
+    }
+    else
+        blexit(L"Unknown module type");
+}
+
+static void __init efi_arch_cpu(void)
+{
+}
+
+static void __init efi_arch_blexit(void)
+{
+    if ( dtbfile.addr && dtbfile.size )
+        efi_bs->FreePages(dtbfile.addr, PFN_UP(dtbfile.size));
+    if ( memmap )
+        efi_bs->FreePool(memmap);
+}
+
+static void __init efi_arch_load_addr_check(EFI_LOADED_IMAGE *loaded_image)
+{
+    if ( (unsigned long)loaded_image->ImageBase & ((1 << 12) - 1) )
+        blexit(L"Xen must be loaded at a 4 KByte boundary.");
+}
+
+static bool_t __init efi_arch_use_config_file(EFI_SYSTEM_TABLE *SystemTable)
+{
+    /*
+     * For arm, we may get a device tree from GRUB (or other bootloader)
+     * that contains modules that have already been loaded into memory.  In
+     * this case, we do not use a configuration file, and rely on the
+     * bootloader to have loaded all required modules and appropriate
+     * options.
+     */
+
+    fdt = lookup_fdt_config_table(SystemTable);
+    dtbfile.ptr = fdt;
+    dtbfile.size = 0;  /* Config table memory can't be freed, so set size to 0 
*/
+    if ( !fdt || fdt_node_offset_by_compatible(fdt, 0, "multiboot,module") < 0 
)
+    {
+        /*
+         * We either have no FDT, or one without modules, so we must have a
+         * Xen EFI configuration file to specify modules.  (dom0 required)
+         */
+        return 1;
+    }
+    PrintStr(L"Using modules provided by bootloader in FDT\r\n");
+    /* We have modules already defined in fdt, just add space. */
+    fdt = fdt_increase_size(&dtbfile, EFI_PAGE_SIZE);
+    return 0;
+}
+
+static void __init efi_arch_console_init(UINTN cols, UINTN rows)
+{
+}
+
+static void __init efi_arch_video_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop,
+                                       UINTN info_size,
+                                       EFI_GRAPHICS_OUTPUT_MODE_INFORMATION 
*mode_info)
+{
+}
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index 079e085..d8b0cfe 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -135,6 +135,7 @@ SECTIONS
        *(.xsm_initcall.init)
        __xsm_initcall_end = .;
   } :text
+  __init_end_efi = .;
   . = ALIGN(STACK_SIZE);
   __init_end = .;
 
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 3d3d76b..c6c0658 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -18,9 +18,17 @@
 #include <xen/string.h>
 #include <xen/stringify.h>
 #include <xen/vga.h>
+#ifdef CONFIG_X86
+/*
+ * Keep this arch-specific modified include in the common file, as moving
+ * it to the arch specific include file would obscure that special care is
+ * taken to include it with __ASSEMBLY__ defined.
+ */
 #define __ASSEMBLY__ /* avoid pulling in ACPI stuff (conflicts with EFI) */
 #include <asm/fixmap.h>
 #undef __ASSEMBLY__
+#endif
+#include <xen/bitops.h>
 
 /* Using SetVirtualAddressMap() is incompatible with kexec: */
 #undef USE_SET_VIRTUAL_ADDRESS_MAP
@@ -66,6 +74,7 @@ static bool_t read_file(EFI_FILE_HANDLE dir_handle, CHAR16 
*name,
                         struct file *file, char *options);
 static size_t wstrlen(const CHAR16 * s);
 static int set_color(u32 mask, int bpp, u8 *pos, u8 *sz);
+static bool_t match_guid(const EFI_GUID *guid1, const EFI_GUID *guid2);
 
 static EFI_BOOT_SERVICES *__initdata efi_bs;
 static EFI_HANDLE __initdata efi_ih;
@@ -121,7 +130,7 @@ static void __init DisplayUint(UINT64 Val, INTN Width)
     PrintStr(PrintString);
 }
 
-static size_t __init wstrlen(const CHAR16 *s)
+static size_t __init __maybe_unused wstrlen(const CHAR16 *s)
 {
     const CHAR16 *sc;
 
@@ -661,7 +670,7 @@ static void __init setup_efi_pci(void)
     efi_bs->FreePool(handles);
 }
 
-static int __init set_color(u32 mask, int bpp, u8 *pos, u8 *sz)
+static int __init __maybe_unused set_color(u32 mask, int bpp, u8 *pos, u8 *sz)
 {
    if ( bpp < 0 )
        return bpp;
@@ -986,8 +995,10 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
               efi.smbios = (long)efi_ct[i].VendorTable;
     }
 
+#ifndef CONFIG_ARM /* TODO - disabled until implemented on ARM */
     if (efi.smbios != EFI_INVALID_TABLE_ADDR)
         dmi_efi_get_table((void *)(long)efi.smbios);
+#endif
 
     /* Collect PCI ROM contents. */
     setup_efi_pci();
@@ -1058,6 +1069,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
     for( ; ; ); /* not reached */
 }
 
+#ifndef CONFIG_ARM /* TODO - runtime service support */
 #ifndef USE_SET_VIRTUAL_ADDRESS_MAP
 static __init void copy_mapping(unsigned long mfn, unsigned long end,
                                 bool_t (*is_valid)(unsigned long smfn,
@@ -1283,3 +1295,4 @@ void __init efi_init_memory(void)
         efi_l4_pgtable[i] = idle_pg_table[i];
 #endif
 }
+#endif
diff --git a/xen/common/efi/efi.h b/xen/common/efi/efi.h
index a80d5f1..bee3b77 100644
--- a/xen/common/efi/efi.h
+++ b/xen/common/efi/efi.h
@@ -28,7 +28,9 @@ extern EFI_RUNTIME_SERVICES *efi_rs;
 extern UINTN efi_memmap_size, efi_mdesc_size;
 extern void *efi_memmap;
 
+#ifdef CONFIG_X86
 extern l4_pgentry_t *efi_l4_pgtable;
+#endif
 
 extern const struct efi_pci_rom *efi_pci_roms;
 
diff --git a/xen/common/efi/runtime.c b/xen/common/efi/runtime.c
index 166852d..6acdcec 100644
--- a/xen/common/efi/runtime.c
+++ b/xen/common/efi/runtime.c
@@ -4,17 +4,23 @@
 #include <xen/guest_access.h>
 #include <xen/irq.h>
 #include <xen/time.h>
+#ifdef CONFIG_X86
 #include <asm/mc146818rtc.h>
+#endif
 
 DEFINE_XEN_GUEST_HANDLE(CHAR16);
 
 #ifndef COMPAT
 
+#ifdef CONFIG_ARM  /* Disabled until runtime services implemented */
+const bool_t efi_enabled = 0;
+#else
 # include <asm/i387.h>
 # include <asm/xstate.h>
 # include <public/platform.h>
 
 const bool_t efi_enabled = 1;
+#endif
 
 unsigned int __read_mostly efi_num_ct;
 EFI_CONFIGURATION_TABLE *__read_mostly efi_ct;
@@ -24,7 +30,6 @@ unsigned int __read_mostly efi_fw_revision;
 const CHAR16 *__read_mostly efi_fw_vendor;
 
 EFI_RUNTIME_SERVICES *__read_mostly efi_rs;
-static DEFINE_SPINLOCK(efi_rs_lock);
 
 UINTN __read_mostly efi_memmap_size;
 UINTN __read_mostly efi_mdesc_size;
@@ -41,10 +46,12 @@ struct efi __read_mostly efi = {
        .smbios = EFI_INVALID_TABLE_ADDR,
 };
 
-l4_pgentry_t *__read_mostly efi_l4_pgtable;
-
 const struct efi_pci_rom *__read_mostly efi_pci_roms;
 
+#ifndef CONFIG_ARM /* TODO - disabled until implemented on ARM */
+static DEFINE_SPINLOCK(efi_rs_lock);
+l4_pgentry_t *__read_mostly efi_l4_pgtable;
+
 unsigned long efi_rs_enter(void)
 {
     static const u16 fcw = FCW_DEFAULT;
@@ -134,8 +141,10 @@ void efi_reset_system(bool_t warm)
     printk(XENLOG_WARNING "EFI: could not reset system (%#lx)\n", status);
 }
 
+#endif /* CONFIG_ARM */
 #endif
 
+#ifndef CONFIG_ARM /* TODO - disabled until implemented on ARM */
 int efi_get_info(uint32_t idx, union xenpf_efi_info *info)
 {
     unsigned int i, n;
@@ -545,3 +554,4 @@ int efi_runtime_call(struct xenpf_efi_runtime_call *op)
 
     return rc;
 }
+#endif
diff --git a/xen/include/asm-arm/arm64/efibind.h 
b/xen/include/asm-arm/arm64/efibind.h
new file mode 100644
index 0000000..2b0bf40
--- /dev/null
+++ b/xen/include/asm-arm/arm64/efibind.h
@@ -0,0 +1,216 @@
+/*++
+
+Copyright (c) 1998  Intel Corporation
+
+Module Name:
+
+    efefind.h
+
+Abstract:
+
+    EFI to compile bindings
+
+
+
+
+Revision History
+
+--*/
+
+#ifndef __GNUC__
+#pragma pack()
+#endif
+
+#define EFIERR(a)           (0x8000000000000000 | a)
+#define EFI_ERROR_MASK      0x8000000000000000
+#define EFIERR_OEM(a)       (0xc000000000000000 | a)
+
+#define BAD_POINTER         0xFBFBFBFBFBFBFBFB
+#define MAX_ADDRESS         0xFFFFFFFFFFFFFFFF
+
+#define EFI_STUB_ERROR      MAX_ADDRESS
+
+#ifndef __ASSEMBLY__
+//
+// Basic int types of various widths
+//
+
+#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L )
+
+    // No ANSI C 1999/2000 stdint.h integer width declarations
+
+    #if defined(__GNUC__)
+        typedef unsigned long long  uint64_t __attribute__((aligned (8)));
+        typedef long long           int64_t __attribute__((aligned (8)));
+        typedef unsigned int        uint32_t;
+        typedef int                 int32_t;
+        typedef unsigned short      uint16_t;
+        typedef short               int16_t;
+        typedef unsigned char       uint8_t;
+        typedef char                int8_t;
+    #elif defined(UNIX_LP64)
+
+        /*  Use LP64 programming model from C_FLAGS for integer width 
declarations */
+
+       typedef unsigned long       uint64_t;
+       typedef long                int64_t;
+       typedef unsigned int        uint32_t;
+       typedef int                 int32_t;
+       typedef unsigned short      uint16_t;
+       typedef short               int16_t;
+       typedef unsigned char       uint8_t;
+       typedef char                int8_t;
+    #else
+
+       /*  Assume P64 programming model from C_FLAGS for integer width 
declarations */
+
+       typedef unsigned long long  uint64_t __attribute__((aligned (8)));
+       typedef long long           int64_t __attribute__((aligned (8)));
+       typedef unsigned int        uint32_t;
+       typedef int                 int32_t;
+       typedef unsigned short      uint16_t;
+       typedef short               int16_t;
+       typedef unsigned char       uint8_t;
+       typedef char                int8_t;
+    #endif
+#endif
+
+//
+// Basic EFI types of various widths
+//
+
+#ifndef __WCHAR_TYPE__
+# define __WCHAR_TYPE__ short
+#endif
+
+typedef uint64_t   UINT64;
+typedef int64_t    INT64;
+
+#ifndef _BASETSD_H_
+    typedef uint32_t   UINT32;
+    typedef int32_t    INT32;
+#endif
+
+typedef uint16_t   UINT16;
+typedef int16_t    INT16;
+typedef uint8_t    UINT8;
+typedef int8_t     INT8;
+typedef __WCHAR_TYPE__ WCHAR;
+
+#undef VOID
+#define VOID    void
+
+
+typedef int64_t    INTN;
+typedef uint64_t   UINTN;
+
+#define POST_CODE(_Data)
+
+
+#define BREAKPOINT()        while (TRUE);    // Make it hang on Bios[Dbg]32
+
+//
+// Pointers must be aligned to these address to function
+//
+
+#define MIN_ALIGNMENT_SIZE  4
+
+#define ALIGN_VARIABLE(Value ,Adjustment) \
+            (UINTN)Adjustment = 0; \
+            if((UINTN)Value % MIN_ALIGNMENT_SIZE) \
+                (UINTN)Adjustment = MIN_ALIGNMENT_SIZE - ((UINTN)Value % 
MIN_ALIGNMENT_SIZE); \
+            Value = (UINTN)Value + (UINTN)Adjustment
+
+
+//
+// Define macros to build data structure signatures from characters.
+//
+
+#define EFI_SIGNATURE_16(A,B)             ((A) | (B<<8))
+#define EFI_SIGNATURE_32(A,B,C,D)         (EFI_SIGNATURE_16(A,B)     | 
(EFI_SIGNATURE_16(C,D)     << 16))
+#define EFI_SIGNATURE_64(A,B,C,D,E,F,G,H) (EFI_SIGNATURE_32(A,B,C,D) | 
((UINT64)(EFI_SIGNATURE_32(E,F,G,H)) << 32))
+
+#define EXPORTAPI
+
+
+//
+// EFIAPI - prototype calling convention for EFI function pointers
+// BOOTSERVICE - prototype for implementation of a boot service interface
+// RUNTIMESERVICE - prototype for implementation of a runtime service interface
+// RUNTIMEFUNCTION - prototype for implementation of a runtime function that 
is not a service
+// RUNTIME_CODE - pragma macro for declaring runtime code
+//
+
+#ifndef EFIAPI                  // Forces EFI calling conventions reguardless 
of compiler options
+        #define EFIAPI          // Substitute expresion to force C calling 
convention
+#endif
+
+#define BOOTSERVICE
+//#define RUNTIMESERVICE(proto,a)    alloc_text("rtcode",a); proto a
+//#define RUNTIMEFUNCTION(proto,a)   alloc_text("rtcode",a); proto a
+#define RUNTIMESERVICE
+#define RUNTIMEFUNCTION
+
+
+#define RUNTIME_CODE(a)         alloc_text("rtcode", a)
+#define BEGIN_RUNTIME_DATA()    data_seg("rtdata")
+#define END_RUNTIME_DATA()      data_seg("")
+
+#define VOLATILE    volatile
+
+#define MEMORY_FENCE()
+
+
+//
+// When build similiar to FW, then link everything together as
+// one big module.
+//
+
+#define EFI_DRIVER_ENTRY_POINT(InitFunction)    \
+    UINTN                                       \
+    InitializeDriver (                          \
+        VOID    *ImageHandle,                   \
+        VOID    *SystemTable                    \
+        )                                       \
+    {                                           \
+        return InitFunction(ImageHandle,        \
+                SystemTable);                   \
+    }                                           \
+                                                \
+    EFI_STATUS efi_main(                        \
+        EFI_HANDLE image,                       \
+        EFI_SYSTEM_TABLE *systab                \
+        ) __attribute__((weak,                  \
+                alias ("InitializeDriver")));
+
+#define LOAD_INTERNAL_DRIVER(_if, type, name, entry)    \
+        (_if)->LoadInternal(type, name, entry)
+
+
+//
+// Some compilers don't support the forward reference construct:
+//  typedef struct XXXXX
+//
+// The following macro provide a workaround for such cases.
+//
+#ifdef NO_INTERFACE_DECL
+#define INTERFACE_DECL(x)
+#else
+#ifdef __GNUC__
+#define INTERFACE_DECL(x) struct x
+#else
+#define INTERFACE_DECL(x) typedef struct x
+#endif
+#endif
+
+#endif
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/efibind.h b/xen/include/asm-arm/efibind.h
new file mode 100644
index 0000000..09dca7a
--- /dev/null
+++ b/xen/include/asm-arm/efibind.h
@@ -0,0 +1,2 @@
+#include <xen/types.h>
+#include <asm/arm64/efibind.h>
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index 36e5704..ba5a67d 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -3,7 +3,7 @@
 
 #include <public/version.h>
 
-#define NR_MEM_BANKS 8
+#define NR_MEM_BANKS 64
 
 #define MAX_MODULES 5 /* Current maximum useful modules */
 
-- 
2.1.0


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