mirror of
https://git.proxmox.com/git/grub2
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120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/relocator.h>
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#include <grub/relocator_private.h>
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#include <grub/memory.h>
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#include <grub/efi/efi.h>
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#include <grub/efi/api.h>
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#include <grub/term.h>
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#define NEXT_MEMORY_DESCRIPTOR(desc, size) \
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((grub_efi_memory_descriptor_t *) ((char *) (desc) + (size)))
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unsigned
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grub_relocator_firmware_get_max_events (void)
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{
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grub_efi_uintn_t mmapsize = 0, descriptor_size = 0;
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grub_efi_uint32_t descriptor_version = 0;
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grub_efi_uintn_t key;
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grub_efi_get_memory_map (&mmapsize, NULL, &key, &descriptor_size,
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&descriptor_version);
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/* Since grub_relocator_firmware_fill_events uses malloc
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we need some reserve. Hence +10. */
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return 2 * (mmapsize / descriptor_size + 10);
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}
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unsigned
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grub_relocator_firmware_fill_events (struct grub_relocator_mmap_event *events)
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{
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grub_efi_uintn_t mmapsize = 0, desc_size = 0;
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grub_efi_uint32_t descriptor_version = 0;
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grub_efi_memory_descriptor_t *descs = NULL;
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grub_efi_uintn_t key;
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int counter = 0;
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grub_efi_memory_descriptor_t *desc;
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grub_efi_get_memory_map (&mmapsize, NULL, &key, &desc_size,
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&descriptor_version);
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descs = grub_malloc (mmapsize);
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if (!descs)
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return 0;
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grub_efi_get_memory_map (&mmapsize, descs, &key, &desc_size,
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&descriptor_version);
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for (desc = descs;
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(char *) desc < ((char *) descs + mmapsize);
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desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
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{
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grub_uint64_t start = desc->physical_start;
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grub_uint64_t end = desc->physical_start + (desc->num_pages << 12);
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/* post-4G addresses are never supported on 32-bit EFI.
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Moreover it has been reported that some 64-bit EFI contrary to the
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spec don't map post-4G pages. So if you enable post-4G allocations,
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map pages manually or check that they are mapped.
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*/
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if (end >= 0x100000000ULL)
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end = 0x100000000ULL;
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if (end <= start)
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continue;
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if (desc->type != GRUB_EFI_CONVENTIONAL_MEMORY)
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continue;
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events[counter].type = REG_FIRMWARE_START;
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events[counter].pos = start;
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counter++;
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events[counter].type = REG_FIRMWARE_END;
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events[counter].pos = end;
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counter++;
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}
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return counter;
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}
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int
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grub_relocator_firmware_alloc_region (grub_addr_t start, grub_size_t size)
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{
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grub_efi_boot_services_t *b;
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grub_efi_physical_address_t address = start;
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grub_efi_status_t status;
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if (grub_efi_is_finished)
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return 1;
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#ifdef DEBUG_RELOCATOR_NOMEM_DPRINTF
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grub_dprintf ("relocator", "EFI alloc: %llx, %llx\n",
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(unsigned long long) start, (unsigned long long) size);
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#endif
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b = grub_efi_system_table->boot_services;
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status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_ADDRESS,
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GRUB_EFI_LOADER_DATA, size >> 12, &address);
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return (status == GRUB_EFI_SUCCESS);
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}
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void
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grub_relocator_firmware_free_region (grub_addr_t start, grub_size_t size)
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{
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grub_efi_boot_services_t *b;
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if (grub_efi_is_finished)
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return;
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b = grub_efi_system_table->boot_services;
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efi_call_2 (b->free_pages, start, size >> 12);
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}
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