1 /* mm.c - generic EFI memory management */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2006,2007,2008,2009 Free Software Foundation, Inc.
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
20 #include <grub/misc.h>
22 #include <grub/efi/api.h>
23 #include <grub/efi/efi.h>
24 #include <grub/cpu/efi/memory.h>
26 #if defined (__i386__) || defined (__x86_64__)
30 #define NEXT_MEMORY_DESCRIPTOR(desc, size) \
31 ((grub_efi_memory_descriptor_t *) ((char *) (desc) + (size)))
33 #define BYTES_TO_PAGES(bytes) (((bytes) + 0xfff) >> 12)
34 #define BYTES_TO_PAGES_DOWN(bytes) ((bytes) >> 12)
35 #define PAGES_TO_BYTES(pages) ((pages) << 12)
37 /* The size of a memory map obtained from the firmware. This must be
38 a multiplier of 4KB. */
39 #define MEMORY_MAP_SIZE 0x3000
41 /* The minimum and maximum heap size for GRUB itself. */
42 #define MIN_HEAP_SIZE 0x100000
43 #define MAX_HEAP_SIZE (1600 * 0x100000)
45 static void *finish_mmap_buf = 0;
46 static grub_efi_uintn_t finish_mmap_size = 0;
47 static grub_efi_uintn_t finish_key = 0;
48 static grub_efi_uintn_t finish_desc_size;
49 static grub_efi_uint32_t finish_desc_version;
50 int grub_efi_is_finished = 0;
52 /* Allocate pages. Return the pointer to the first of allocated pages. */
54 grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
55 grub_efi_uintn_t pages,
56 grub_efi_allocate_type_t alloctype,
57 grub_efi_memory_type_t memtype)
59 grub_efi_status_t status;
60 grub_efi_boot_services_t *b;
62 /* Limit the memory access to less than 4GB for 32-bit platforms. */
63 if (address > GRUB_EFI_MAX_USABLE_ADDRESS)
66 b = grub_efi_system_table->boot_services;
67 status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
68 if (status != GRUB_EFI_SUCCESS)
73 /* Uggh, the address 0 was allocated... This is too annoying,
74 so reallocate another one. */
75 address = GRUB_EFI_MAX_USABLE_ADDRESS;
76 status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
77 grub_efi_free_pages (0, pages);
78 if (status != GRUB_EFI_SUCCESS)
82 return (void *) ((grub_addr_t) address);
86 grub_efi_allocate_pages (grub_efi_physical_address_t address,
87 grub_efi_uintn_t pages)
89 grub_efi_allocate_type_t alloctype;
93 alloctype = GRUB_EFI_ALLOCATE_MAX_ADDRESS;
94 address = GRUB_EFI_MAX_USABLE_ADDRESS;
97 alloctype = GRUB_EFI_ALLOCATE_ADDRESS;
99 return grub_efi_allocate_pages_real (address, pages, alloctype,
100 GRUB_EFI_LOADER_DATA);
103 /* Free pages starting from ADDRESS. */
105 grub_efi_free_pages (grub_efi_physical_address_t address,
106 grub_efi_uintn_t pages)
108 grub_efi_boot_services_t *b;
110 b = grub_efi_system_table->boot_services;
111 efi_call_2 (b->free_pages, address, pages);
114 #if defined (__i386__) || defined (__x86_64__)
116 /* Helper for stop_broadcom. */
118 find_card (grub_pci_device_t dev, grub_pci_id_t pciid,
119 void *data __attribute__ ((unused)))
121 grub_pci_address_t addr;
123 grub_uint16_t pm_state;
125 if ((pciid & 0xffff) != GRUB_PCI_VENDOR_BROADCOM)
128 addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
129 if (grub_pci_read (addr) >> 24 != GRUB_PCI_CLASS_NETWORK)
131 cap = grub_pci_find_capability (dev, GRUB_PCI_CAP_POWER_MANAGEMENT);
134 addr = grub_pci_make_address (dev, cap + 4);
135 pm_state = grub_pci_read_word (addr);
136 pm_state = pm_state | 0x03;
137 grub_pci_write_word (addr, pm_state);
138 grub_pci_read_word (addr);
145 grub_pci_iterate (find_card, NULL);
151 grub_efi_finish_boot_services (grub_efi_uintn_t *outbuf_size, void *outbuf,
152 grub_efi_uintn_t *map_key,
153 grub_efi_uintn_t *efi_desc_size,
154 grub_efi_uint32_t *efi_desc_version)
156 grub_efi_boot_services_t *b;
157 grub_efi_status_t status;
159 #if defined (__i386__) || defined (__x86_64__)
160 const grub_uint16_t apple[] = { 'A', 'p', 'p', 'l', 'e' };
163 is_apple = (grub_memcmp (grub_efi_system_table->firmware_vendor,
164 apple, sizeof (apple)) == 0);
169 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
170 &finish_desc_size, &finish_desc_version) < 0)
171 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
173 if (outbuf && *outbuf_size < finish_mmap_size)
174 return grub_error (GRUB_ERR_IO, "memory map buffer is too small");
176 finish_mmap_buf = grub_malloc (finish_mmap_size);
177 if (!finish_mmap_buf)
180 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
181 &finish_desc_size, &finish_desc_version) <= 0)
183 grub_free (finish_mmap_buf);
184 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
187 b = grub_efi_system_table->boot_services;
188 status = efi_call_2 (b->exit_boot_services, grub_efi_image_handle,
190 if (status == GRUB_EFI_SUCCESS)
193 if (status != GRUB_EFI_INVALID_PARAMETER)
195 grub_free (finish_mmap_buf);
196 return grub_error (GRUB_ERR_IO, "couldn't terminate EFI services");
199 grub_free (finish_mmap_buf);
200 grub_printf ("Trying to terminate EFI services again\n");
202 grub_efi_is_finished = 1;
204 *outbuf_size = finish_mmap_size;
206 grub_memcpy (outbuf, finish_mmap_buf, finish_mmap_size);
208 *map_key = finish_key;
210 *efi_desc_size = finish_desc_size;
211 if (efi_desc_version)
212 *efi_desc_version = finish_desc_version;
214 #if defined (__i386__) || defined (__x86_64__)
219 return GRUB_ERR_NONE;
222 /* Get the memory map as defined in the EFI spec. Return 1 if successful,
223 return 0 if partial, or return -1 if an error occurs. */
225 grub_efi_get_memory_map (grub_efi_uintn_t *memory_map_size,
226 grub_efi_memory_descriptor_t *memory_map,
227 grub_efi_uintn_t *map_key,
228 grub_efi_uintn_t *descriptor_size,
229 grub_efi_uint32_t *descriptor_version)
231 grub_efi_status_t status;
232 grub_efi_boot_services_t *b;
233 grub_efi_uintn_t key;
234 grub_efi_uint32_t version;
235 grub_efi_uintn_t size;
237 if (grub_efi_is_finished)
240 if (*memory_map_size < finish_mmap_size)
242 grub_memcpy (memory_map, finish_mmap_buf, *memory_map_size);
247 grub_memcpy (memory_map, finish_mmap_buf, finish_mmap_size);
250 *memory_map_size = finish_mmap_size;
252 *map_key = finish_key;
254 *descriptor_size = finish_desc_size;
255 if (descriptor_version)
256 *descriptor_version = finish_desc_version;
260 /* Allow some parameters to be missing. */
263 if (! descriptor_version)
264 descriptor_version = &version;
265 if (! descriptor_size)
266 descriptor_size = &size;
268 b = grub_efi_system_table->boot_services;
269 status = efi_call_5 (b->get_memory_map, memory_map_size, memory_map, map_key,
270 descriptor_size, descriptor_version);
271 if (*descriptor_size == 0)
272 *descriptor_size = sizeof (grub_efi_memory_descriptor_t);
273 if (status == GRUB_EFI_SUCCESS)
275 else if (status == GRUB_EFI_BUFFER_TOO_SMALL)
281 /* Sort the memory map in place. */
283 sort_memory_map (grub_efi_memory_descriptor_t *memory_map,
284 grub_efi_uintn_t desc_size,
285 grub_efi_memory_descriptor_t *memory_map_end)
287 grub_efi_memory_descriptor_t *d1;
288 grub_efi_memory_descriptor_t *d2;
290 for (d1 = memory_map;
292 d1 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size))
294 grub_efi_memory_descriptor_t *max_desc = d1;
296 for (d2 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size);
298 d2 = NEXT_MEMORY_DESCRIPTOR (d2, desc_size))
300 if (max_desc->num_pages < d2->num_pages)
306 grub_efi_memory_descriptor_t tmp;
315 /* Filter the descriptors. GRUB needs only available memory. */
316 static grub_efi_memory_descriptor_t *
317 filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
318 grub_efi_memory_descriptor_t *filtered_memory_map,
319 grub_efi_uintn_t desc_size,
320 grub_efi_memory_descriptor_t *memory_map_end)
322 grub_efi_memory_descriptor_t *desc;
323 grub_efi_memory_descriptor_t *filtered_desc;
325 for (desc = memory_map, filtered_desc = filtered_memory_map;
326 desc < memory_map_end;
327 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
329 if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
331 && desc->physical_start <= GRUB_EFI_MAX_USABLE_ADDRESS
333 && desc->physical_start + PAGES_TO_BYTES (desc->num_pages) > 0x100000
334 && desc->num_pages != 0)
336 grub_memcpy (filtered_desc, desc, desc_size);
338 /* Avoid less than 1MB, because some loaders seem to be confused. */
339 if (desc->physical_start < 0x100000)
341 desc->num_pages -= BYTES_TO_PAGES (0x100000
342 - desc->physical_start);
343 desc->physical_start = 0x100000;
347 if (BYTES_TO_PAGES (filtered_desc->physical_start)
348 + filtered_desc->num_pages
349 > BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS))
350 filtered_desc->num_pages
351 = (BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS)
352 - BYTES_TO_PAGES (filtered_desc->physical_start));
355 if (filtered_desc->num_pages == 0)
358 filtered_desc = NEXT_MEMORY_DESCRIPTOR (filtered_desc, desc_size);
362 return filtered_desc;
365 /* Return the total number of pages. */
366 static grub_efi_uint64_t
367 get_total_pages (grub_efi_memory_descriptor_t *memory_map,
368 grub_efi_uintn_t desc_size,
369 grub_efi_memory_descriptor_t *memory_map_end)
371 grub_efi_memory_descriptor_t *desc;
372 grub_efi_uint64_t total = 0;
374 for (desc = memory_map;
375 desc < memory_map_end;
376 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
377 total += desc->num_pages;
382 /* Add memory regions. */
384 add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
385 grub_efi_uintn_t desc_size,
386 grub_efi_memory_descriptor_t *memory_map_end,
387 grub_efi_uint64_t required_pages)
389 grub_efi_memory_descriptor_t *desc;
391 for (desc = memory_map;
392 desc < memory_map_end;
393 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
395 grub_efi_uint64_t pages;
396 grub_efi_physical_address_t start;
399 start = desc->physical_start;
400 pages = desc->num_pages;
401 if (pages > required_pages)
403 start += PAGES_TO_BYTES (pages - required_pages);
404 pages = required_pages;
407 addr = grub_efi_allocate_pages (start, pages);
409 grub_fatal ("cannot allocate conventional memory %p with %u pages",
410 (void *) ((grub_addr_t) start),
413 grub_mm_init_region (addr, PAGES_TO_BYTES (pages));
415 required_pages -= pages;
416 if (required_pages == 0)
420 if (required_pages > 0)
421 grub_fatal ("too little memory");
425 /* Print the memory map. */
427 print_memory_map (grub_efi_memory_descriptor_t *memory_map,
428 grub_efi_uintn_t desc_size,
429 grub_efi_memory_descriptor_t *memory_map_end)
431 grub_efi_memory_descriptor_t *desc;
434 for (desc = memory_map, i = 0;
435 desc < memory_map_end;
436 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size), i++)
438 grub_printf ("MD: t=%x, p=%llx, v=%llx, n=%llx, a=%llx\n",
439 desc->type, desc->physical_start, desc->virtual_start,
440 desc->num_pages, desc->attribute);
446 grub_efi_mm_init (void)
448 grub_efi_memory_descriptor_t *memory_map;
449 grub_efi_memory_descriptor_t *memory_map_end;
450 grub_efi_memory_descriptor_t *filtered_memory_map;
451 grub_efi_memory_descriptor_t *filtered_memory_map_end;
452 grub_efi_uintn_t map_size;
453 grub_efi_uintn_t desc_size;
454 grub_efi_uint64_t total_pages;
455 grub_efi_uint64_t required_pages;
458 /* Prepare a memory region to store two memory maps. */
459 memory_map = grub_efi_allocate_pages (0,
460 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
462 grub_fatal ("cannot allocate memory");
464 /* Obtain descriptors for available memory. */
465 map_size = MEMORY_MAP_SIZE;
467 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0);
472 ((grub_efi_physical_address_t) ((grub_addr_t) memory_map),
473 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
475 /* Freeing/allocating operations may increase memory map size. */
476 map_size += desc_size * 32;
478 memory_map = grub_efi_allocate_pages (0, 2 * BYTES_TO_PAGES (map_size));
480 grub_fatal ("cannot allocate memory");
482 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
487 grub_fatal ("cannot get memory map");
489 memory_map_end = NEXT_MEMORY_DESCRIPTOR (memory_map, map_size);
491 filtered_memory_map = memory_map_end;
493 filtered_memory_map_end = filter_memory_map (memory_map, filtered_memory_map,
494 desc_size, memory_map_end);
496 /* By default, request a quarter of the available memory. */
497 total_pages = get_total_pages (filtered_memory_map, desc_size,
498 filtered_memory_map_end);
499 required_pages = (total_pages >> 2);
500 if (required_pages < BYTES_TO_PAGES (MIN_HEAP_SIZE))
501 required_pages = BYTES_TO_PAGES (MIN_HEAP_SIZE);
502 else if (required_pages > BYTES_TO_PAGES (MAX_HEAP_SIZE))
503 required_pages = BYTES_TO_PAGES (MAX_HEAP_SIZE);
505 /* Sort the filtered descriptors, so that GRUB can allocate pages
506 from smaller regions. */
507 sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
509 /* Allocate memory regions for GRUB's memory management. */
510 add_memory_regions (filtered_memory_map, desc_size,
511 filtered_memory_map_end, required_pages);
515 map_size = MEMORY_MAP_SIZE;
517 if (grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0) < 0)
518 grub_fatal ("cannot get memory map");
520 grub_printf ("printing memory map\n");
521 print_memory_map (memory_map, desc_size,
522 NEXT_MEMORY_DESCRIPTOR (memory_map, map_size));
523 grub_fatal ("Debug. ");
526 /* Release the memory maps. */
527 grub_efi_free_pages ((grub_addr_t) memory_map,
528 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));