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;
53 * We need to roll back EFI allocations on exit. Remember allocations that
56 struct efi_allocation;
57 struct efi_allocation {
58 grub_efi_physical_address_t address;
59 grub_efi_uint64_t pages;
60 struct efi_allocation *next;
62 static struct efi_allocation *efi_allocated_memory;
65 grub_efi_store_alloc (grub_efi_physical_address_t address,
66 grub_efi_uintn_t pages)
68 grub_efi_boot_services_t *b;
69 struct efi_allocation *alloc;
70 grub_efi_status_t status;
72 b = grub_efi_system_table->boot_services;
73 status = efi_call_3 (b->allocate_pool, GRUB_EFI_LOADER_DATA,
74 sizeof(*alloc), (void**)&alloc);
76 if (status == GRUB_EFI_SUCCESS)
78 alloc->next = efi_allocated_memory;
79 alloc->address = address;
81 efi_allocated_memory = alloc;
84 grub_printf ("Could not malloc memory to remember EFI allocation. "
85 "Exiting GRUB won't free all memory.\n");
89 grub_efi_drop_alloc (grub_efi_physical_address_t address,
90 grub_efi_uintn_t pages)
92 struct efi_allocation *ea, *eap;
93 grub_efi_boot_services_t *b;
95 b = grub_efi_system_table->boot_services;
97 for (eap = NULL, ea = efi_allocated_memory; ea; eap = ea, ea = ea->next)
99 if (ea->address != address || ea->pages != pages)
102 /* Remove the current entry from the list. */
104 eap->next = ea->next;
106 efi_allocated_memory = ea->next;
108 /* Then free the memory backing it. */
109 efi_call_1 (b->free_pool, ea);
111 /* And leave, we're done. */
116 /* Allocate pages. Return the pointer to the first of allocated pages. */
118 grub_efi_allocate_pages_real (grub_efi_physical_address_t address,
119 grub_efi_uintn_t pages,
120 grub_efi_allocate_type_t alloctype,
121 grub_efi_memory_type_t memtype)
123 grub_efi_status_t status;
124 grub_efi_boot_services_t *b;
126 /* Limit the memory access to less than 4GB for 32-bit platforms. */
127 if (address > GRUB_EFI_MAX_USABLE_ADDRESS)
130 b = grub_efi_system_table->boot_services;
131 status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
132 if (status != GRUB_EFI_SUCCESS)
137 /* Uggh, the address 0 was allocated... This is too annoying,
138 so reallocate another one. */
139 address = GRUB_EFI_MAX_USABLE_ADDRESS;
140 status = efi_call_4 (b->allocate_pages, alloctype, memtype, pages, &address);
141 grub_efi_free_pages (0, pages);
142 if (status != GRUB_EFI_SUCCESS)
146 grub_efi_store_alloc (address, pages);
148 return (void *) ((grub_addr_t) address);
152 grub_efi_allocate_any_pages (grub_efi_uintn_t pages)
154 return grub_efi_allocate_pages_real (GRUB_EFI_MAX_USABLE_ADDRESS,
155 pages, GRUB_EFI_ALLOCATE_MAX_ADDRESS,
156 GRUB_EFI_LOADER_DATA);
160 grub_efi_allocate_fixed (grub_efi_physical_address_t address,
161 grub_efi_uintn_t pages)
163 return grub_efi_allocate_pages_real (address, pages,
164 GRUB_EFI_ALLOCATE_ADDRESS,
165 GRUB_EFI_LOADER_DATA);
168 /* Free pages starting from ADDRESS. */
170 grub_efi_free_pages (grub_efi_physical_address_t address,
171 grub_efi_uintn_t pages)
173 grub_efi_boot_services_t *b;
175 b = grub_efi_system_table->boot_services;
176 efi_call_2 (b->free_pages, address, pages);
178 grub_efi_drop_alloc (address, pages);
181 #if defined (__i386__) || defined (__x86_64__)
183 /* Helper for stop_broadcom. */
185 find_card (grub_pci_device_t dev, grub_pci_id_t pciid,
186 void *data __attribute__ ((unused)))
188 grub_pci_address_t addr;
190 grub_uint16_t pm_state;
192 if ((pciid & 0xffff) != GRUB_PCI_VENDOR_BROADCOM)
195 addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
196 if (grub_pci_read (addr) >> 24 != GRUB_PCI_CLASS_NETWORK)
198 cap = grub_pci_find_capability (dev, GRUB_PCI_CAP_POWER_MANAGEMENT);
201 addr = grub_pci_make_address (dev, cap + 4);
202 pm_state = grub_pci_read_word (addr);
203 pm_state = pm_state | 0x03;
204 grub_pci_write_word (addr, pm_state);
205 grub_pci_read_word (addr);
212 grub_pci_iterate (find_card, NULL);
218 grub_efi_finish_boot_services (grub_efi_uintn_t *outbuf_size, void *outbuf,
219 grub_efi_uintn_t *map_key,
220 grub_efi_uintn_t *efi_desc_size,
221 grub_efi_uint32_t *efi_desc_version)
223 grub_efi_boot_services_t *b;
224 grub_efi_status_t status;
226 #if defined (__i386__) || defined (__x86_64__)
227 const grub_uint16_t apple[] = { 'A', 'p', 'p', 'l', 'e' };
230 is_apple = (grub_memcmp (grub_efi_system_table->firmware_vendor,
231 apple, sizeof (apple)) == 0);
236 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
237 &finish_desc_size, &finish_desc_version) < 0)
238 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
240 if (outbuf && *outbuf_size < finish_mmap_size)
241 return grub_error (GRUB_ERR_IO, "memory map buffer is too small");
243 finish_mmap_buf = grub_malloc (finish_mmap_size);
244 if (!finish_mmap_buf)
247 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
248 &finish_desc_size, &finish_desc_version) <= 0)
250 grub_free (finish_mmap_buf);
251 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
254 b = grub_efi_system_table->boot_services;
255 status = efi_call_2 (b->exit_boot_services, grub_efi_image_handle,
257 if (status == GRUB_EFI_SUCCESS)
260 if (status != GRUB_EFI_INVALID_PARAMETER)
262 grub_free (finish_mmap_buf);
263 return grub_error (GRUB_ERR_IO, "couldn't terminate EFI services");
266 grub_free (finish_mmap_buf);
267 grub_printf ("Trying to terminate EFI services again\n");
269 grub_efi_is_finished = 1;
271 *outbuf_size = finish_mmap_size;
273 grub_memcpy (outbuf, finish_mmap_buf, finish_mmap_size);
275 *map_key = finish_key;
277 *efi_desc_size = finish_desc_size;
278 if (efi_desc_version)
279 *efi_desc_version = finish_desc_version;
281 #if defined (__i386__) || defined (__x86_64__)
286 return GRUB_ERR_NONE;
289 /* Get the memory map as defined in the EFI spec. Return 1 if successful,
290 return 0 if partial, or return -1 if an error occurs. */
292 grub_efi_get_memory_map (grub_efi_uintn_t *memory_map_size,
293 grub_efi_memory_descriptor_t *memory_map,
294 grub_efi_uintn_t *map_key,
295 grub_efi_uintn_t *descriptor_size,
296 grub_efi_uint32_t *descriptor_version)
298 grub_efi_status_t status;
299 grub_efi_boot_services_t *b;
300 grub_efi_uintn_t key;
301 grub_efi_uint32_t version;
302 grub_efi_uintn_t size;
304 if (grub_efi_is_finished)
307 if (*memory_map_size < finish_mmap_size)
309 grub_memcpy (memory_map, finish_mmap_buf, *memory_map_size);
314 grub_memcpy (memory_map, finish_mmap_buf, finish_mmap_size);
317 *memory_map_size = finish_mmap_size;
319 *map_key = finish_key;
321 *descriptor_size = finish_desc_size;
322 if (descriptor_version)
323 *descriptor_version = finish_desc_version;
327 /* Allow some parameters to be missing. */
330 if (! descriptor_version)
331 descriptor_version = &version;
332 if (! descriptor_size)
333 descriptor_size = &size;
335 b = grub_efi_system_table->boot_services;
336 status = efi_call_5 (b->get_memory_map, memory_map_size, memory_map, map_key,
337 descriptor_size, descriptor_version);
338 if (*descriptor_size == 0)
339 *descriptor_size = sizeof (grub_efi_memory_descriptor_t);
340 if (status == GRUB_EFI_SUCCESS)
342 else if (status == GRUB_EFI_BUFFER_TOO_SMALL)
348 /* Sort the memory map in place. */
350 sort_memory_map (grub_efi_memory_descriptor_t *memory_map,
351 grub_efi_uintn_t desc_size,
352 grub_efi_memory_descriptor_t *memory_map_end)
354 grub_efi_memory_descriptor_t *d1;
355 grub_efi_memory_descriptor_t *d2;
357 for (d1 = memory_map;
359 d1 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size))
361 grub_efi_memory_descriptor_t *max_desc = d1;
363 for (d2 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size);
365 d2 = NEXT_MEMORY_DESCRIPTOR (d2, desc_size))
367 if (max_desc->num_pages < d2->num_pages)
373 grub_efi_memory_descriptor_t tmp;
382 /* Filter the descriptors. GRUB needs only available memory. */
383 static grub_efi_memory_descriptor_t *
384 filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
385 grub_efi_memory_descriptor_t *filtered_memory_map,
386 grub_efi_uintn_t desc_size,
387 grub_efi_memory_descriptor_t *memory_map_end)
389 grub_efi_memory_descriptor_t *desc;
390 grub_efi_memory_descriptor_t *filtered_desc;
392 for (desc = memory_map, filtered_desc = filtered_memory_map;
393 desc < memory_map_end;
394 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
396 if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
398 && desc->physical_start <= GRUB_EFI_MAX_USABLE_ADDRESS
400 && desc->physical_start + PAGES_TO_BYTES (desc->num_pages) > 0x100000
401 && desc->num_pages != 0)
403 grub_memcpy (filtered_desc, desc, desc_size);
405 /* Avoid less than 1MB, because some loaders seem to be confused. */
406 if (desc->physical_start < 0x100000)
408 desc->num_pages -= BYTES_TO_PAGES (0x100000
409 - desc->physical_start);
410 desc->physical_start = 0x100000;
414 if (BYTES_TO_PAGES (filtered_desc->physical_start)
415 + filtered_desc->num_pages
416 > BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS))
417 filtered_desc->num_pages
418 = (BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS)
419 - BYTES_TO_PAGES (filtered_desc->physical_start));
422 if (filtered_desc->num_pages == 0)
425 filtered_desc = NEXT_MEMORY_DESCRIPTOR (filtered_desc, desc_size);
429 return filtered_desc;
432 /* Return the total number of pages. */
433 static grub_efi_uint64_t
434 get_total_pages (grub_efi_memory_descriptor_t *memory_map,
435 grub_efi_uintn_t desc_size,
436 grub_efi_memory_descriptor_t *memory_map_end)
438 grub_efi_memory_descriptor_t *desc;
439 grub_efi_uint64_t total = 0;
441 for (desc = memory_map;
442 desc < memory_map_end;
443 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
444 total += desc->num_pages;
449 /* Add memory regions. */
451 add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
452 grub_efi_uintn_t desc_size,
453 grub_efi_memory_descriptor_t *memory_map_end,
454 grub_efi_uint64_t required_pages)
456 grub_efi_memory_descriptor_t *desc;
458 for (desc = memory_map;
459 desc < memory_map_end;
460 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
462 grub_efi_uint64_t pages;
463 grub_efi_physical_address_t start;
466 start = desc->physical_start;
467 pages = desc->num_pages;
468 if (pages > required_pages)
470 start += PAGES_TO_BYTES (pages - required_pages);
471 pages = required_pages;
474 addr = grub_efi_allocate_pages_real (start, pages,
475 GRUB_EFI_ALLOCATE_ADDRESS,
476 GRUB_EFI_LOADER_CODE);
478 grub_fatal ("cannot allocate conventional memory %p with %u pages",
479 (void *) ((grub_addr_t) start),
482 grub_mm_init_region (addr, PAGES_TO_BYTES (pages));
484 required_pages -= pages;
485 if (required_pages == 0)
489 if (required_pages > 0)
490 grub_fatal ("too little memory");
494 grub_efi_memory_fini (void)
497 * Free all stale allocations. grub_efi_free_pages() will remove
498 * the found entry from the list and it will always find the first
499 * list entry (efi_allocated_memory is the list start). Hence we
500 * remove all entries from the list until none is left altogether.
502 while (efi_allocated_memory)
503 grub_efi_free_pages (efi_allocated_memory->address,
504 efi_allocated_memory->pages);
508 /* Print the memory map. */
510 print_memory_map (grub_efi_memory_descriptor_t *memory_map,
511 grub_efi_uintn_t desc_size,
512 grub_efi_memory_descriptor_t *memory_map_end)
514 grub_efi_memory_descriptor_t *desc;
517 for (desc = memory_map, i = 0;
518 desc < memory_map_end;
519 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size), i++)
521 grub_printf ("MD: t=%x, p=%llx, v=%llx, n=%llx, a=%llx\n",
522 desc->type, desc->physical_start, desc->virtual_start,
523 desc->num_pages, desc->attribute);
529 grub_efi_mm_init (void)
531 grub_efi_memory_descriptor_t *memory_map;
532 grub_efi_memory_descriptor_t *memory_map_end;
533 grub_efi_memory_descriptor_t *filtered_memory_map;
534 grub_efi_memory_descriptor_t *filtered_memory_map_end;
535 grub_efi_uintn_t map_size;
536 grub_efi_uintn_t desc_size;
537 grub_efi_uint64_t total_pages;
538 grub_efi_uint64_t required_pages;
541 /* Prepare a memory region to store two memory maps. */
542 memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
544 grub_fatal ("cannot allocate memory");
546 /* Obtain descriptors for available memory. */
547 map_size = MEMORY_MAP_SIZE;
549 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0);
554 ((grub_efi_physical_address_t) ((grub_addr_t) memory_map),
555 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
557 /* Freeing/allocating operations may increase memory map size. */
558 map_size += desc_size * 32;
560 memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (map_size));
562 grub_fatal ("cannot allocate memory");
564 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
569 grub_fatal ("cannot get memory map");
571 memory_map_end = NEXT_MEMORY_DESCRIPTOR (memory_map, map_size);
573 filtered_memory_map = memory_map_end;
575 filtered_memory_map_end = filter_memory_map (memory_map, filtered_memory_map,
576 desc_size, memory_map_end);
578 /* By default, request a quarter of the available memory. */
579 total_pages = get_total_pages (filtered_memory_map, desc_size,
580 filtered_memory_map_end);
581 required_pages = (total_pages >> 2);
582 if (required_pages < BYTES_TO_PAGES (MIN_HEAP_SIZE))
583 required_pages = BYTES_TO_PAGES (MIN_HEAP_SIZE);
584 else if (required_pages > BYTES_TO_PAGES (MAX_HEAP_SIZE))
585 required_pages = BYTES_TO_PAGES (MAX_HEAP_SIZE);
587 /* Sort the filtered descriptors, so that GRUB can allocate pages
588 from smaller regions. */
589 sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
591 /* Allocate memory regions for GRUB's memory management. */
592 add_memory_regions (filtered_memory_map, desc_size,
593 filtered_memory_map_end, required_pages);
597 map_size = MEMORY_MAP_SIZE;
599 if (grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0) < 0)
600 grub_fatal ("cannot get memory map");
602 grub_printf ("printing memory map\n");
603 print_memory_map (memory_map, desc_size,
604 NEXT_MEMORY_DESCRIPTOR (memory_map, map_size));
605 grub_fatal ("Debug. ");
608 /* Release the memory maps. */
609 grub_efi_free_pages ((grub_addr_t) memory_map,
610 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));