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 (grub_efi_physical_address_t address,
55 grub_efi_uintn_t pages)
57 grub_efi_allocate_type_t type;
58 grub_efi_status_t status;
59 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)
70 type = GRUB_EFI_ALLOCATE_MAX_ADDRESS;
71 address = GRUB_EFI_MAX_USABLE_ADDRESS;
74 type = GRUB_EFI_ALLOCATE_ADDRESS;
77 type = GRUB_EFI_ALLOCATE_ANY_PAGES;
79 type = GRUB_EFI_ALLOCATE_ADDRESS;
82 b = grub_efi_system_table->boot_services;
83 status = efi_call_4 (b->allocate_pages, type, GRUB_EFI_LOADER_DATA, pages, &address);
84 if (status != GRUB_EFI_SUCCESS)
89 /* Uggh, the address 0 was allocated... This is too annoying,
90 so reallocate another one. */
91 address = GRUB_EFI_MAX_USABLE_ADDRESS;
92 status = efi_call_4 (b->allocate_pages, type, GRUB_EFI_LOADER_DATA, pages, &address);
93 grub_efi_free_pages (0, pages);
94 if (status != GRUB_EFI_SUCCESS)
98 return (void *) ((grub_addr_t) address);
101 /* Free pages starting from ADDRESS. */
103 grub_efi_free_pages (grub_efi_physical_address_t address,
104 grub_efi_uintn_t pages)
106 grub_efi_boot_services_t *b;
108 b = grub_efi_system_table->boot_services;
109 efi_call_2 (b->free_pages, address, pages);
112 #if defined (__i386__) || defined (__x86_64__)
114 /* Helper for stop_broadcom. */
116 find_card (grub_pci_device_t dev, grub_pci_id_t pciid,
117 void *data __attribute__ ((unused)))
119 grub_pci_address_t addr;
121 grub_uint16_t pm_state;
123 if ((pciid & 0xffff) != GRUB_PCI_VENDOR_BROADCOM)
126 addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
127 if (grub_pci_read (addr) >> 24 != GRUB_PCI_CLASS_NETWORK)
129 cap = grub_pci_find_capability (dev, GRUB_PCI_CAP_POWER_MANAGEMENT);
132 addr = grub_pci_make_address (dev, cap + 4);
133 pm_state = grub_pci_read_word (addr);
134 pm_state = pm_state | 0x03;
135 grub_pci_write_word (addr, pm_state);
136 grub_pci_read_word (addr);
143 grub_pci_iterate (find_card, NULL);
149 grub_efi_finish_boot_services (grub_efi_uintn_t *outbuf_size, void *outbuf,
150 grub_efi_uintn_t *map_key,
151 grub_efi_uintn_t *efi_desc_size,
152 grub_efi_uint32_t *efi_desc_version)
154 grub_efi_boot_services_t *b;
155 grub_efi_status_t status;
157 #if defined (__i386__) || defined (__x86_64__)
158 const grub_uint16_t apple[] = { 'A', 'p', 'p', 'l', 'e' };
161 is_apple = (grub_memcmp (grub_efi_system_table->firmware_vendor,
162 apple, sizeof (apple)) == 0);
167 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
168 &finish_desc_size, &finish_desc_version) < 0)
169 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
171 if (outbuf && *outbuf_size < finish_mmap_size)
172 return grub_error (GRUB_ERR_IO, "memory map buffer is too small");
174 finish_mmap_buf = grub_malloc (finish_mmap_size);
175 if (!finish_mmap_buf)
178 if (grub_efi_get_memory_map (&finish_mmap_size, finish_mmap_buf, &finish_key,
179 &finish_desc_size, &finish_desc_version) <= 0)
181 grub_free (finish_mmap_buf);
182 return grub_error (GRUB_ERR_IO, "couldn't retrieve memory map");
185 b = grub_efi_system_table->boot_services;
186 status = efi_call_2 (b->exit_boot_services, grub_efi_image_handle,
188 if (status == GRUB_EFI_SUCCESS)
191 if (status != GRUB_EFI_INVALID_PARAMETER)
193 grub_free (finish_mmap_buf);
194 return grub_error (GRUB_ERR_IO, "couldn't terminate EFI services");
197 grub_free (finish_mmap_buf);
198 grub_printf ("Trying to terminate EFI services again\n");
200 grub_efi_is_finished = 1;
202 *outbuf_size = finish_mmap_size;
204 grub_memcpy (outbuf, finish_mmap_buf, finish_mmap_size);
206 *map_key = finish_key;
208 *efi_desc_size = finish_desc_size;
209 if (efi_desc_version)
210 *efi_desc_version = finish_desc_version;
212 #if defined (__i386__) || defined (__x86_64__)
217 return GRUB_ERR_NONE;
220 /* Get the memory map as defined in the EFI spec. Return 1 if successful,
221 return 0 if partial, or return -1 if an error occurs. */
223 grub_efi_get_memory_map (grub_efi_uintn_t *memory_map_size,
224 grub_efi_memory_descriptor_t *memory_map,
225 grub_efi_uintn_t *map_key,
226 grub_efi_uintn_t *descriptor_size,
227 grub_efi_uint32_t *descriptor_version)
229 grub_efi_status_t status;
230 grub_efi_boot_services_t *b;
231 grub_efi_uintn_t key;
232 grub_efi_uint32_t version;
233 grub_efi_uintn_t size;
235 if (grub_efi_is_finished)
238 if (*memory_map_size < finish_mmap_size)
240 grub_memcpy (memory_map, finish_mmap_buf, *memory_map_size);
245 grub_memcpy (memory_map, finish_mmap_buf, finish_mmap_size);
248 *memory_map_size = finish_mmap_size;
250 *map_key = finish_key;
252 *descriptor_size = finish_desc_size;
253 if (descriptor_version)
254 *descriptor_version = finish_desc_version;
258 /* Allow some parameters to be missing. */
261 if (! descriptor_version)
262 descriptor_version = &version;
263 if (! descriptor_size)
264 descriptor_size = &size;
266 b = grub_efi_system_table->boot_services;
267 status = efi_call_5 (b->get_memory_map, memory_map_size, memory_map, map_key,
268 descriptor_size, descriptor_version);
269 if (*descriptor_size == 0)
270 *descriptor_size = sizeof (grub_efi_memory_descriptor_t);
271 if (status == GRUB_EFI_SUCCESS)
273 else if (status == GRUB_EFI_BUFFER_TOO_SMALL)
279 /* Sort the memory map in place. */
281 sort_memory_map (grub_efi_memory_descriptor_t *memory_map,
282 grub_efi_uintn_t desc_size,
283 grub_efi_memory_descriptor_t *memory_map_end)
285 grub_efi_memory_descriptor_t *d1;
286 grub_efi_memory_descriptor_t *d2;
288 for (d1 = memory_map;
290 d1 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size))
292 grub_efi_memory_descriptor_t *max_desc = d1;
294 for (d2 = NEXT_MEMORY_DESCRIPTOR (d1, desc_size);
296 d2 = NEXT_MEMORY_DESCRIPTOR (d2, desc_size))
298 if (max_desc->num_pages < d2->num_pages)
304 grub_efi_memory_descriptor_t tmp;
313 /* Filter the descriptors. GRUB needs only available memory. */
314 static grub_efi_memory_descriptor_t *
315 filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
316 grub_efi_memory_descriptor_t *filtered_memory_map,
317 grub_efi_uintn_t desc_size,
318 grub_efi_memory_descriptor_t *memory_map_end)
320 grub_efi_memory_descriptor_t *desc;
321 grub_efi_memory_descriptor_t *filtered_desc;
323 for (desc = memory_map, filtered_desc = filtered_memory_map;
324 desc < memory_map_end;
325 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
327 if (desc->type == GRUB_EFI_CONVENTIONAL_MEMORY
329 && desc->physical_start <= GRUB_EFI_MAX_USABLE_ADDRESS
331 && desc->physical_start + PAGES_TO_BYTES (desc->num_pages) > 0x100000
332 && desc->num_pages != 0)
334 grub_memcpy (filtered_desc, desc, desc_size);
336 /* Avoid less than 1MB, because some loaders seem to be confused. */
337 if (desc->physical_start < 0x100000)
339 desc->num_pages -= BYTES_TO_PAGES (0x100000
340 - desc->physical_start);
341 desc->physical_start = 0x100000;
345 if (BYTES_TO_PAGES (filtered_desc->physical_start)
346 + filtered_desc->num_pages
347 > BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS))
348 filtered_desc->num_pages
349 = (BYTES_TO_PAGES_DOWN (GRUB_EFI_MAX_USABLE_ADDRESS)
350 - BYTES_TO_PAGES (filtered_desc->physical_start));
353 if (filtered_desc->num_pages == 0)
356 filtered_desc = NEXT_MEMORY_DESCRIPTOR (filtered_desc, desc_size);
360 return filtered_desc;
363 /* Return the total number of pages. */
364 static grub_efi_uint64_t
365 get_total_pages (grub_efi_memory_descriptor_t *memory_map,
366 grub_efi_uintn_t desc_size,
367 grub_efi_memory_descriptor_t *memory_map_end)
369 grub_efi_memory_descriptor_t *desc;
370 grub_efi_uint64_t total = 0;
372 for (desc = memory_map;
373 desc < memory_map_end;
374 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
375 total += desc->num_pages;
380 /* Add memory regions. */
382 add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
383 grub_efi_uintn_t desc_size,
384 grub_efi_memory_descriptor_t *memory_map_end,
385 grub_efi_uint64_t required_pages)
387 grub_efi_memory_descriptor_t *desc;
389 for (desc = memory_map;
390 desc < memory_map_end;
391 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
393 grub_efi_uint64_t pages;
394 grub_efi_physical_address_t start;
397 start = desc->physical_start;
398 pages = desc->num_pages;
399 if (pages > required_pages)
401 start += PAGES_TO_BYTES (pages - required_pages);
402 pages = required_pages;
405 addr = grub_efi_allocate_pages (start, pages);
407 grub_fatal ("cannot allocate conventional memory %p with %u pages",
408 (void *) ((grub_addr_t) start),
411 grub_mm_init_region (addr, PAGES_TO_BYTES (pages));
413 required_pages -= pages;
414 if (required_pages == 0)
418 if (required_pages > 0)
419 grub_fatal ("too little memory");
423 /* Print the memory map. */
425 print_memory_map (grub_efi_memory_descriptor_t *memory_map,
426 grub_efi_uintn_t desc_size,
427 grub_efi_memory_descriptor_t *memory_map_end)
429 grub_efi_memory_descriptor_t *desc;
432 for (desc = memory_map, i = 0;
433 desc < memory_map_end;
434 desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size), i++)
436 grub_printf ("MD: t=%x, p=%llx, v=%llx, n=%llx, a=%llx\n",
437 desc->type, desc->physical_start, desc->virtual_start,
438 desc->num_pages, desc->attribute);
444 grub_efi_mm_init (void)
446 grub_efi_memory_descriptor_t *memory_map;
447 grub_efi_memory_descriptor_t *memory_map_end;
448 grub_efi_memory_descriptor_t *filtered_memory_map;
449 grub_efi_memory_descriptor_t *filtered_memory_map_end;
450 grub_efi_uintn_t map_size;
451 grub_efi_uintn_t desc_size;
452 grub_efi_uint64_t total_pages;
453 grub_efi_uint64_t required_pages;
456 /* Prepare a memory region to store two memory maps. */
457 memory_map = grub_efi_allocate_pages (0,
458 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
460 grub_fatal ("cannot allocate memory");
462 /* Obtain descriptors for available memory. */
463 map_size = MEMORY_MAP_SIZE;
465 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0);
470 ((grub_efi_physical_address_t) ((grub_addr_t) memory_map),
471 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
473 /* Freeing/allocating operations may increase memory map size. */
474 map_size += desc_size * 32;
476 memory_map = grub_efi_allocate_pages (0, 2 * BYTES_TO_PAGES (map_size));
478 grub_fatal ("cannot allocate memory");
480 mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
485 grub_fatal ("cannot get memory map");
487 memory_map_end = NEXT_MEMORY_DESCRIPTOR (memory_map, map_size);
489 filtered_memory_map = memory_map_end;
491 filtered_memory_map_end = filter_memory_map (memory_map, filtered_memory_map,
492 desc_size, memory_map_end);
494 /* By default, request a quarter of the available memory. */
495 total_pages = get_total_pages (filtered_memory_map, desc_size,
496 filtered_memory_map_end);
497 required_pages = (total_pages >> 2);
498 if (required_pages < BYTES_TO_PAGES (MIN_HEAP_SIZE))
499 required_pages = BYTES_TO_PAGES (MIN_HEAP_SIZE);
500 else if (required_pages > BYTES_TO_PAGES (MAX_HEAP_SIZE))
501 required_pages = BYTES_TO_PAGES (MAX_HEAP_SIZE);
503 /* Sort the filtered descriptors, so that GRUB can allocate pages
504 from smaller regions. */
505 sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
507 /* Allocate memory regions for GRUB's memory management. */
508 add_memory_regions (filtered_memory_map, desc_size,
509 filtered_memory_map_end, required_pages);
513 map_size = MEMORY_MAP_SIZE;
515 if (grub_efi_get_memory_map (&map_size, memory_map, 0, &desc_size, 0) < 0)
516 grub_fatal ("cannot get memory map");
518 grub_printf ("printing memory map\n");
519 print_memory_map (memory_map, desc_size,
520 NEXT_MEMORY_DESCRIPTOR (memory_map, map_size));
521 grub_fatal ("Debug. ");
524 /* Release the memory maps. */
525 grub_efi_free_pages ((grub_addr_t) memory_map,
526 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));