efi: libstub: simplify efi_get_memory_map() and struct efi_boot_memmap

Currently, struct efi_boot_memmap is a struct that is passed around
between callers of efi_get_memory_map() and the users of the resulting
data, and which carries pointers to various variables whose values are
provided by the EFI GetMemoryMap() boot service.

This is overly complex, and it is much easier to carry these values in
the struct itself. So turn the struct into one that carries these data
items directly, including a flex array for the variable number of EFI
memory descriptors that the boot service may return.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
index 577173ee1f83d4eebca0100e2941cd47e3ae34b2..83b5ae3721ea0534b376799d574c3df36b269744 100644 (file)
--- a/drivers/firmware/efi/libstub/arm64-stub.c
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -42,26 +42,17 @@ efi_status_t check_platform_features(void)
  */
 static bool check_image_region(u64 base, u64 size)
 {
-       unsigned long map_size, desc_size, buff_size;
-       efi_memory_desc_t *memory_map;
-       struct efi_boot_memmap map;
+       struct efi_boot_memmap *map;
        efi_status_t status;
        bool ret = false;
        int map_offset;
 
-       map.map =       &memory_map;
-       map.map_size =  &map_size;
-       map.desc_size = &desc_size;
-       map.desc_ver =  NULL;
-       map.key_ptr =   NULL;
-       map.buff_size = &buff_size;
-
        status = efi_get_memory_map(&map);
        if (status != EFI_SUCCESS)
                return false;
 
-       for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
-               efi_memory_desc_t *md = (void *)memory_map + map_offset;
+       for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
+               efi_memory_desc_t *md = (void *)map->map + map_offset;
                u64 end = md->phys_addr + md->num_pages * EFI_PAGE_SIZE;
 
                /*
@@ -74,7 +65,7 @@ static bool check_image_region(u64 base, u64 size)
                }
        }
 
-       efi_bs_call(free_pool, memory_map);
+       efi_bs_call(free_pool, map);
 
        return ret;
 }

diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 3d972061c1b0d30b9d07b450daf51a4a4f32fb01..85c68aa836734eae52470bd085c579c963a88079 100644 (file)
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -419,7 +419,6 @@ char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
 /**
  * efi_exit_boot_services() - Exit boot services
  * @handle:    handle of the exiting image
- * @map:       pointer to receive the memory map
  * @priv:      argument to be passed to @priv_func
  * @priv_func: function to process the memory map before exiting boot services
  *
@@ -432,14 +431,13 @@ char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
  *
  * Return:     status code
  */
-efi_status_t efi_exit_boot_services(void *handle,
-                                   struct efi_boot_memmap *map,
-                                   void *priv,
+efi_status_t efi_exit_boot_services(void *handle, void *priv,
                                    efi_exit_boot_map_processing priv_func)
 {
+       struct efi_boot_memmap *map;
        efi_status_t status;
 
-       status = efi_get_memory_map(map);
+       status = efi_get_memory_map(&map);
 
        if (status != EFI_SUCCESS)
                goto fail;
@@ -451,7 +449,7 @@ efi_status_t efi_exit_boot_services(void *handle,
        if (efi_disable_pci_dma)
                efi_pci_disable_bridge_busmaster();
 
-       status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
+       status = efi_bs_call(exit_boot_services, handle, map->map_key);
 
        if (status == EFI_INVALID_PARAMETER) {
                /*
@@ -467,13 +465,13 @@ efi_status_t efi_exit_boot_services(void *handle,
                 * buffer should account for any changes in the map so the call
                 * to get_memory_map() is expected to succeed here.
                 */
-               *map->map_size = *map->buff_size;
+               map->map_size = map->buff_size;
                status = efi_bs_call(get_memory_map,
-                                    map->map_size,
-                                    *map->map,
-                                    map->key_ptr,
-                                    map->desc_size,
-                                    map->desc_ver);
+                                    &map->map_size,
+                                    &map->map,
+                                    &map->map_key,
+                                    &map->desc_size,
+                                    &map->desc_ver);
 
                /* exit_boot_services() was called, thus cannot free */
                if (status != EFI_SUCCESS)
@@ -484,7 +482,7 @@ efi_status_t efi_exit_boot_services(void *handle,
                if (status != EFI_SUCCESS)
                        goto fail;
 
-               status = efi_bs_call(exit_boot_services, handle, *map->key_ptr);
+               status = efi_bs_call(exit_boot_services, handle, map->map_key);
        }
 
        /* exit_boot_services() was called, thus cannot free */
@@ -494,7 +492,7 @@ efi_status_t efi_exit_boot_services(void *handle,
        return EFI_SUCCESS;
 
 free_map:
-       efi_bs_call(free_pool, *map->map);
+       efi_bs_call(free_pool, map);
 fail:
        return status;
 }

diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index e9d466822b67083d9ba43c46fe48119ba71734af..ed32055f03400cf49703bac0339d67bf5dc8886f 100644 (file)
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -160,15 +160,6 @@ void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
  */
 #define EFI_MMAP_NR_SLACK_SLOTS        8
 
-struct efi_boot_memmap {
-       efi_memory_desc_t       **map;
-       unsigned long           *map_size;
-       unsigned long           *desc_size;
-       u32                     *desc_ver;
-       unsigned long           *key_ptr;
-       unsigned long           *buff_size;
-};
-
 typedef struct efi_generic_dev_path efi_device_path_protocol_t;
 
 typedef void *efi_event_t;
@@ -850,9 +841,7 @@ typedef efi_status_t (*efi_exit_boot_map_processing)(
        struct efi_boot_memmap *map,
        void *priv);
 
-efi_status_t efi_exit_boot_services(void *handle,
-                                   struct efi_boot_memmap *map,
-                                   void *priv,
+efi_status_t efi_exit_boot_services(void *handle, void *priv,
                                    efi_exit_boot_map_processing priv_func);
 
 efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
@@ -891,7 +880,7 @@ void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_si
 
 char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len);
 
-efi_status_t efi_get_memory_map(struct efi_boot_memmap *map);
+efi_status_t efi_get_memory_map(struct efi_boot_memmap **map);
 
 efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
                                unsigned long max);

diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index 5a283c64fb3ca8de86f2c0172daa2430065349c6..9c912e6ef0db987f5d93ad45f79e16ea032e5c56 100644 (file)
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -170,25 +170,25 @@ static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
        if (node < 0)
                return EFI_LOAD_ERROR;
 
-       fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
+       fdt_val64 = cpu_to_fdt64((unsigned long)map->map);
 
        err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
        if (err)
                return EFI_LOAD_ERROR;
 
-       fdt_val32 = cpu_to_fdt32(*map->map_size);
+       fdt_val32 = cpu_to_fdt32(map->map_size);
 
        err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
        if (err)
                return EFI_LOAD_ERROR;
 
-       fdt_val32 = cpu_to_fdt32(*map->desc_size);
+       fdt_val32 = cpu_to_fdt32(map->desc_size);
 
        err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
        if (err)
                return EFI_LOAD_ERROR;
 
-       fdt_val32 = cpu_to_fdt32(*map->desc_ver);
+       fdt_val32 = cpu_to_fdt32(map->desc_ver);
 
        err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
        if (err)
@@ -198,21 +198,24 @@ static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
 }
 
 struct exit_boot_struct {
+       struct efi_boot_memmap  *boot_memmap;
        efi_memory_desc_t       *runtime_map;
        int                     runtime_entry_count;
        void                    *new_fdt_addr;
 };
 
-static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
-                                  void *priv)
+static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
 {
        struct exit_boot_struct *p = priv;
+
+       p->boot_memmap = map;
+
        /*
         * Update the memory map with virtual addresses. The function will also
         * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
         * entries so that we can pass it straight to SetVirtualAddressMap()
         */
-       efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
+       efi_get_virtmap(map->map, map->map_size, map->desc_size,
                        p->runtime_map, &p->runtime_entry_count);
 
        return update_fdt_memmap(p->new_fdt_addr, map);
@@ -243,20 +246,11 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
                                            unsigned long fdt_addr,
                                            unsigned long fdt_size)
 {
-       unsigned long map_size, desc_size, buff_size;
+       unsigned long desc_size;
        u32 desc_ver;
-       unsigned long mmap_key;
-       efi_memory_desc_t *memory_map;
        efi_status_t status;
-       struct efi_boot_memmap map;
        struct exit_boot_struct priv;
 
-       map.map_size    = &map_size;
-       map.desc_size   = &desc_size;
-       map.desc_ver    = &desc_ver;
-       map.key_ptr     = &mmap_key;
-       map.buff_size   = &buff_size;
-
        if (!efi_novamap) {
                status = efi_alloc_virtmap(&priv.runtime_map, &desc_size,
                                           &desc_ver);
@@ -268,7 +262,6 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 
        efi_info("Exiting boot services...\n");
 
-       map.map = &memory_map;
        status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, ULONG_MAX);
        if (status != EFI_SUCCESS) {
                efi_err("Unable to allocate memory for new device tree.\n");
@@ -286,7 +279,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
 
        priv.new_fdt_addr = (void *)*new_fdt_addr;
 
-       status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
+       status = efi_exit_boot_services(handle, &priv, exit_boot_func);
 
        if (status == EFI_SUCCESS) {
                efi_set_virtual_address_map_t *svam;
@@ -305,6 +298,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
                 * incoming kernel but proceed normally otherwise.
                 */
                if (status != EFI_SUCCESS) {
+                       efi_memory_desc_t *p;
                        int l;
 
                        /*
@@ -313,8 +307,9 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
                         * the incoming kernel that no virtual translation has
                         * been installed.
                         */
-                       for (l = 0; l < map_size; l += desc_size) {
-                               efi_memory_desc_t *p = (void *)memory_map + l;
+                       for (l = 0; l < priv.boot_memmap->map_size;
+                            l += priv.boot_memmap->desc_size) {
+                               p = (void *)priv.boot_memmap->map + l;
 
                                if (p->attribute & EFI_MEMORY_RUNTIME)
                                        p->virt_addr = 0;

diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
index feef8d4be113b653d8216347ed81e7beaf55396e..c92b7dbc6dfe6d820817cc4f326627d927606858 100644 (file)
--- a/drivers/firmware/efi/libstub/mem.c
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -5,71 +5,45 @@
 
 #include "efistub.h"
 
-static inline bool mmap_has_headroom(unsigned long buff_size,
-                                    unsigned long map_size,
-                                    unsigned long desc_size)
-{
-       unsigned long slack = buff_size - map_size;
-
-       return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS;
-}
-
 /**
  * efi_get_memory_map() - get memory map
- * @map:       on return pointer to memory map
+ * @map:               pointer to memory map pointer to which to assign the
+ *                     newly allocated memory map
  *
  * Retrieve the UEFI memory map. The allocated memory leaves room for
  * up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.
  *
  * Return:     status code
  */
-efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
+efi_status_t efi_get_memory_map(struct efi_boot_memmap **map)
 {
-       efi_memory_desc_t *m = NULL;
+       struct efi_boot_memmap *m, tmp;
        efi_status_t status;
-       unsigned long key;
-       u32 desc_version;
+       unsigned long size;
 
-       *map->desc_size =       sizeof(*m);
-       *map->map_size =        *map->desc_size * 32;
-       *map->buff_size =       *map->map_size;
-again:
-       status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
-                            *map->map_size, (void **)&m);
+       tmp.map_size = 0;
+       status = efi_bs_call(get_memory_map, &tmp.map_size, NULL, &tmp.map_key,
+                            &tmp.desc_size, &tmp.desc_ver);
+       if (status != EFI_BUFFER_TOO_SMALL)
+               return EFI_LOAD_ERROR;
+
+       size = tmp.map_size + tmp.desc_size * EFI_MMAP_NR_SLACK_SLOTS;
+       status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*m) + size,
+                            (void **)&m);
        if (status != EFI_SUCCESS)
-               goto fail;
+               return status;
 
-       *map->desc_size = 0;
-       key = 0;
-       status = efi_bs_call(get_memory_map, map->map_size, m,
-                            &key, map->desc_size, &desc_version);
-       if (status == EFI_BUFFER_TOO_SMALL ||
-           !mmap_has_headroom(*map->buff_size, *map->map_size,
-                              *map->desc_size)) {
-               efi_bs_call(free_pool, m);
-               /*
-                * Make sure there is some entries of headroom so that the
-                * buffer can be reused for a new map after allocations are
-                * no longer permitted.  Its unlikely that the map will grow to
-                * exceed this headroom once we are ready to trigger
-                * ExitBootServices()
-                */
-               *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS;
-               *map->buff_size = *map->map_size;
-               goto again;
-       }
+       m->buff_size = m->map_size = size;
+       status = efi_bs_call(get_memory_map, &m->map_size, m->map, &m->map_key,
+                            &m->desc_size, &m->desc_ver);
+       if (status != EFI_SUCCESS)
+               goto free_map;
 
-       if (status == EFI_SUCCESS) {
-               if (map->key_ptr)
-                       *map->key_ptr = key;
-               if (map->desc_ver)
-                       *map->desc_ver = desc_version;
-       } else {
-               efi_bs_call(free_pool, m);
-       }
+       *map = m;
+       return EFI_SUCCESS;
 
-fail:
-       *map->map = m;
+free_map:
+       efi_bs_call(free_pool, m);
        return status;
 }
 

diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c
index 715f374791542bb477bdbb9e613862c6c5b861c7..5d6000c717ccbf0f8092668fd49d7aed936d2ad5 100644 (file)
--- a/drivers/firmware/efi/libstub/randomalloc.c
+++ b/drivers/firmware/efi/libstub/randomalloc.c
@@ -55,20 +55,11 @@ efi_status_t efi_random_alloc(unsigned long size,
                              unsigned long *addr,
                              unsigned long random_seed)
 {
-       unsigned long map_size, desc_size, total_slots = 0, target_slot;
+       unsigned long total_slots = 0, target_slot;
        unsigned long total_mirrored_slots = 0;
-       unsigned long buff_size;
+       struct efi_boot_memmap *map;
        efi_status_t status;
-       efi_memory_desc_t *memory_map;
        int map_offset;
-       struct efi_boot_memmap map;
-
-       map.map =       &memory_map;
-       map.map_size =  &map_size;
-       map.desc_size = &desc_size;
-       map.desc_ver =  NULL;
-       map.key_ptr =   NULL;
-       map.buff_size = &buff_size;
 
        status = efi_get_memory_map(&map);
        if (status != EFI_SUCCESS)
@@ -80,8 +71,8 @@ efi_status_t efi_random_alloc(unsigned long size,
        size = round_up(size, EFI_ALLOC_ALIGN);
 
        /* count the suitable slots in each memory map entry */
-       for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
-               efi_memory_desc_t *md = (void *)memory_map + map_offset;
+       for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
+               efi_memory_desc_t *md = (void *)map->map + map_offset;
                unsigned long slots;
 
                slots = get_entry_num_slots(md, size, ilog2(align));
@@ -109,8 +100,8 @@ efi_status_t efi_random_alloc(unsigned long size,
         * to calculate the randomly chosen address, and allocate it directly
         * using EFI_ALLOCATE_ADDRESS.
         */
-       for (map_offset = 0; map_offset < map_size; map_offset += desc_size) {
-               efi_memory_desc_t *md = (void *)memory_map + map_offset;
+       for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
+               efi_memory_desc_t *md = (void *)map->map + map_offset;
                efi_physical_addr_t target;
                unsigned long pages;
 
@@ -133,7 +124,7 @@ efi_status_t efi_random_alloc(unsigned long size,
                break;
        }
 
-       efi_bs_call(free_pool, memory_map);
+       efi_bs_call(free_pool, map);
 
        return status;
 }

diff --git a/drivers/firmware/efi/libstub/relocate.c b/drivers/firmware/efi/libstub/relocate.c
index 8ee9eb2b90392d993431bba9972923cc4c293683..cd80db33ab1e759a5da61710581172b3d61bfe60 100644 (file)
--- a/drivers/firmware/efi/libstub/relocate.c
+++ b/drivers/firmware/efi/libstub/relocate.c
@@ -23,21 +23,12 @@
 efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
                                 unsigned long *addr, unsigned long min)
 {
-       unsigned long map_size, desc_size, buff_size;
-       efi_memory_desc_t *map;
+       struct efi_boot_memmap *map;
        efi_status_t status;
        unsigned long nr_pages;
        int i;
-       struct efi_boot_memmap boot_map;
 
-       boot_map.map            = ↦
-       boot_map.map_size       = &map_size;
-       boot_map.desc_size      = &desc_size;
-       boot_map.desc_ver       = NULL;
-       boot_map.key_ptr        = NULL;
-       boot_map.buff_size      = &buff_size;
-
-       status = efi_get_memory_map(&boot_map);
+       status = efi_get_memory_map(&map);
        if (status != EFI_SUCCESS)
                goto fail;
 
@@ -52,12 +43,12 @@ efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
 
        size = round_up(size, EFI_ALLOC_ALIGN);
        nr_pages = size / EFI_PAGE_SIZE;
-       for (i = 0; i < map_size / desc_size; i++) {
+       for (i = 0; i < map->map_size / map->desc_size; i++) {
                efi_memory_desc_t *desc;
-               unsigned long m = (unsigned long)map;
+               unsigned long m = (unsigned long)map->map;
                u64 start, end;
 
-               desc = efi_early_memdesc_ptr(m, desc_size, i);
+               desc = efi_early_memdesc_ptr(m, map->desc_size, i);
 
                if (desc->type != EFI_CONVENTIONAL_MEMORY)
                        continue;
@@ -87,7 +78,7 @@ efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
                }
        }
 
-       if (i == map_size / desc_size)
+       if (i == map->map_size / map->desc_size)
                status = EFI_NOT_FOUND;
 
        efi_bs_call(free_pool, map);

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index 05ae8bcc9d671e46bb350d0193c866c54f22bb3d..1ae1e7e576b9f31f8129b4b105187a2d23233980 100644 (file)
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -716,32 +716,22 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
 
        efi_set_u64_split((unsigned long)efi_system_table,
                          &p->efi->efi_systab, &p->efi->efi_systab_hi);
-       p->efi->efi_memdesc_size        = *map->desc_size;
-       p->efi->efi_memdesc_version     = *map->desc_ver;
-       efi_set_u64_split((unsigned long)*map->map,
+       p->efi->efi_memdesc_size        = map->desc_size;
+       p->efi->efi_memdesc_version     = map->desc_ver;
+       efi_set_u64_split((unsigned long)map->map,
                          &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
-       p->efi->efi_memmap_size         = *map->map_size;
+       p->efi->efi_memmap_size         = map->map_size;
 
        return EFI_SUCCESS;
 }
 
 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
 {
-       unsigned long map_sz, key, desc_size, buff_size;
-       efi_memory_desc_t *mem_map;
        struct setup_data *e820ext = NULL;
        __u32 e820ext_size = 0;
        efi_status_t status;
-       __u32 desc_version;
-       struct efi_boot_memmap map;
        struct exit_boot_struct priv;
 
-       map.map                 = &mem_map;
-       map.map_size            = &map_sz;
-       map.desc_size           = &desc_size;
-       map.desc_ver            = &desc_version;
-       map.key_ptr             = &key;
-       map.buff_size           = &buff_size;
        priv.boot_params        = boot_params;
        priv.efi                = &boot_params->efi_info;
 
@@ -750,7 +740,7 @@ static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
                return status;
 
        /* Might as well exit boot services now */
-       status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
+       status = efi_exit_boot_services(handle, &priv, exit_boot_func);
        if (status != EFI_SUCCESS)
                return status;
 

diff --git a/include/linux/efi.h b/include/linux/efi.h
index d2b84c2fec39f0268324d1a38a73ed67786973c9..f1b3e0d1b3faecf51567e2580c2529bbd870c4ca 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -518,6 +518,15 @@ typedef union {
        efi_system_table_32_t mixed_mode;
 } efi_system_table_t;
 
+struct efi_boot_memmap {
+       unsigned long           map_size;
+       unsigned long           desc_size;
+       u32                     desc_ver;
+       unsigned long           map_key;
+       unsigned long           buff_size;
+       efi_memory_desc_t       map[];
+};
+
 /*
  * Architecture independent structure for describing a memory map for the
  * benefit of efi_memmap_init_early(), and for passing context between