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