* SPDX-License-Identifier: GPL-2.0+
*/
-/* #define DEBUG_EFI */
-
#include <common.h>
#include <efi_loader.h>
#include <malloc.h>
struct efi_mem_desc desc;
};
+#define EFI_CARVE_NO_OVERLAP -1
+#define EFI_CARVE_LOOP_AGAIN -2
+#define EFI_CARVE_OVERLAPS_NONRAM -3
+
/* This list contains all memory map items */
LIST_HEAD(efi_mem);
+#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
+void *efi_bounce_buffer;
+#endif
+
+/*
+ * U-Boot services each EFI AllocatePool request as a separate
+ * (multiple) page allocation. We have to track the number of pages
+ * to be able to free the correct amount later.
+ * EFI requires 8 byte alignment for pool allocations, so we can
+ * prepend each allocation with an 64 bit header tracking the
+ * allocation size, and hand out the remainder to the caller.
+ */
+struct efi_pool_allocation {
+ u64 num_pages;
+ char data[] __aligned(ARCH_DMA_MINALIGN);
+};
+
/*
* Sorts the memory list from highest address to lowest address
*
* Unmaps all memory occupied by the carve_desc region from the
* list entry pointed to by map.
*
- * Returns 1 if carving was performed or 0 if the regions don't overlap.
- * Returns -1 if it would affect non-RAM regions but overlap_only_ram is set.
- * Carving is only guaranteed to complete when all regions return 0.
+ * Returns EFI_CARVE_NO_OVERLAP if the regions don't overlap.
+ * Returns EFI_CARVE_OVERLAPS_NONRAM if the carve and map overlap,
+ * and the map contains anything but free ram.
+ * (only when overlap_only_ram is true)
+ * Returns EFI_CARVE_LOOP_AGAIN if the mapping list should be traversed
+ * again, as it has been altered
+ * Returns the number of overlapping pages. The pages are removed from
+ * the mapping list.
+ *
+ * In case of EFI_CARVE_OVERLAPS_NONRAM it is the callers responsibility
+ * to readd the already carved out pages to the mapping.
*/
static int efi_mem_carve_out(struct efi_mem_list *map,
struct efi_mem_desc *carve_desc,
/* check whether we're overlapping */
if ((carve_end <= map_start) || (carve_start >= map_end))
- return 0;
+ return EFI_CARVE_NO_OVERLAP;
/* We're overlapping with non-RAM, warn the caller if desired */
if (overlap_only_ram && (map_desc->type != EFI_CONVENTIONAL_MEMORY))
- return -1;
+ return EFI_CARVE_OVERLAPS_NONRAM;
/* Sanitize carve_start and carve_end to lie within our bounds */
carve_start = max(carve_start, map_start);
if (map_end == carve_end) {
/* Full overlap, just remove map */
list_del(&map->link);
+ free(map);
+ } else {
+ map->desc.physical_start = carve_end;
+ map->desc.num_pages = (map_end - carve_end)
+ >> EFI_PAGE_SHIFT;
}
- map_desc->physical_start = carve_end;
- map_desc->num_pages = (map_end - carve_end) >> EFI_PAGE_SHIFT;
- return 1;
+ return (carve_end - carve_start) >> EFI_PAGE_SHIFT;
}
/*
newmap->desc = map->desc;
newmap->desc.physical_start = carve_start;
newmap->desc.num_pages = (map_end - carve_start) >> EFI_PAGE_SHIFT;
- list_add_tail(&newmap->link, &efi_mem);
+ /* Insert before current entry (descending address order) */
+ list_add_tail(&newmap->link, &map->link);
/* Shrink the map to [ map_start ... carve_start ] */
map_desc->num_pages = (carve_start - map_start) >> EFI_PAGE_SHIFT;
- return 1;
+ return EFI_CARVE_LOOP_AGAIN;
}
uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
{
struct list_head *lhandle;
struct efi_mem_list *newlist;
- bool do_carving;
+ bool carve_again;
+ uint64_t carved_pages = 0;
+
+ debug("%s: 0x%" PRIx64 " 0x%" PRIx64 " %d %s\n", __func__,
+ start, pages, memory_type, overlap_only_ram ? "yes" : "no");
if (!pages)
return start;
/* Add our new map */
do {
- do_carving = false;
+ carve_again = false;
list_for_each(lhandle, &efi_mem) {
struct efi_mem_list *lmem;
int r;
lmem = list_entry(lhandle, struct efi_mem_list, link);
r = efi_mem_carve_out(lmem, &newlist->desc,
overlap_only_ram);
- if (r < 0) {
+ switch (r) {
+ case EFI_CARVE_OVERLAPS_NONRAM:
+ /*
+ * The user requested to only have RAM overlaps,
+ * but we hit a non-RAM region. Error out.
+ */
return 0;
- } else if (r) {
- do_carving = true;
+ case EFI_CARVE_NO_OVERLAP:
+ /* Just ignore this list entry */
+ break;
+ case EFI_CARVE_LOOP_AGAIN:
+ /*
+ * We split an entry, but need to loop through
+ * the list again to actually carve it.
+ */
+ carve_again = true;
+ break;
+ default:
+ /* We carved a number of pages */
+ carved_pages += r;
+ carve_again = true;
+ break;
+ }
+
+ if (carve_again) {
+ /* The list changed, we need to start over */
break;
}
}
- } while (do_carving);
+ } while (carve_again);
+
+ if (overlap_only_ram && (carved_pages != pages)) {
+ /*
+ * The payload wanted to have RAM overlaps, but we overlapped
+ * with an unallocated region. Error out.
+ */
+ return 0;
+ }
/* Add our new map */
list_add_tail(&newlist->link, &efi_mem);
return 0;
}
+/*
+ * Allocate memory pages.
+ *
+ * @type type of allocation to be performed
+ * @memory_type usage type of the allocated memory
+ * @pages number of pages to be allocated
+ * @memory allocated memory
+ * @return status code
+ */
efi_status_t efi_allocate_pages(int type, int memory_type,
- unsigned long pages, uint64_t *memory)
+ efi_uintn_t pages, uint64_t *memory)
{
u64 len = pages << EFI_PAGE_SHIFT;
efi_status_t r = EFI_SUCCESS;
return NULL;
}
-efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
+/*
+ * Free memory pages.
+ *
+ * @memory start of the memory area to be freed
+ * @pages number of pages to be freed
+ * @return status code
+ */
+efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
{
- /* We don't free, let's cross our fingers we have plenty RAM */
- return EFI_SUCCESS;
+ uint64_t r = 0;
+
+ r = efi_add_memory_map(memory, pages, EFI_CONVENTIONAL_MEMORY, false);
+ /* Merging of adjacent free regions is missing */
+
+ if (r == memory)
+ return EFI_SUCCESS;
+
+ return EFI_NOT_FOUND;
}
-efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
- struct efi_mem_desc *memory_map,
- unsigned long *map_key,
- unsigned long *descriptor_size,
- uint32_t *descriptor_version)
+/*
+ * Allocate memory from pool.
+ *
+ * @pool_type type of the pool from which memory is to be allocated
+ * @size number of bytes to be allocated
+ * @buffer allocated memory
+ * @return status code
+ */
+efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size, void **buffer)
{
- ulong map_size = 0;
+ efi_status_t r;
+ efi_physical_addr_t t;
+ u64 num_pages = (size + sizeof(struct efi_pool_allocation) +
+ EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
+
+ if (size == 0) {
+ *buffer = NULL;
+ return EFI_SUCCESS;
+ }
+
+ r = efi_allocate_pages(0, pool_type, num_pages, &t);
+
+ if (r == EFI_SUCCESS) {
+ struct efi_pool_allocation *alloc = (void *)(uintptr_t)t;
+ alloc->num_pages = num_pages;
+ *buffer = alloc->data;
+ }
+
+ return r;
+}
+
+/*
+ * Free memory from pool.
+ *
+ * @buffer start of memory to be freed
+ * @return status code
+ */
+efi_status_t efi_free_pool(void *buffer)
+{
+ efi_status_t r;
+ struct efi_pool_allocation *alloc;
+
+ if (buffer == NULL)
+ return EFI_INVALID_PARAMETER;
+
+ alloc = container_of(buffer, struct efi_pool_allocation, data);
+ /* Sanity check, was the supplied address returned by allocate_pool */
+ assert(((uintptr_t)alloc & EFI_PAGE_MASK) == 0);
+
+ r = efi_free_pages((uintptr_t)alloc, alloc->num_pages);
+
+ return r;
+}
+
+/*
+ * Get map describing memory usage.
+ *
+ * @memory_map_size on entry the size, in bytes, of the memory map buffer,
+ * on exit the size of the copied memory map
+ * @memory_map buffer to which the memory map is written
+ * @map_key key for the memory map
+ * @descriptor_size size of an individual memory descriptor
+ * @descriptor_version version number of the memory descriptor structure
+ * @return status code
+ */
+efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
+ struct efi_mem_desc *memory_map,
+ efi_uintn_t *map_key,
+ efi_uintn_t *descriptor_size,
+ uint32_t *descriptor_version)
+{
+ efi_uintn_t map_size = 0;
int map_entries = 0;
struct list_head *lhandle;
+ efi_uintn_t provided_map_size = *memory_map_size;
list_for_each(lhandle, &efi_mem)
map_entries++;
*memory_map_size = map_size;
+ if (provided_map_size < map_size)
+ return EFI_BUFFER_TOO_SMALL;
+
if (descriptor_size)
*descriptor_size = sizeof(struct efi_mem_desc);
- if (*memory_map_size < map_size)
- return EFI_BUFFER_TOO_SMALL;
+ if (descriptor_version)
+ *descriptor_version = EFI_MEMORY_DESCRIPTOR_VERSION;
/* Copy list into array */
if (memory_map) {
}
}
+ *map_key = 0;
+
return EFI_SUCCESS;
}
-int efi_memory_init(void)
+__weak void efi_add_known_memory(void)
{
- unsigned long runtime_start, runtime_end, runtime_pages;
- unsigned long uboot_start, uboot_pages;
- unsigned long uboot_stack_size = 16 * 1024 * 1024;
int i;
/* Add RAM */
efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
false);
}
+}
+
+int efi_memory_init(void)
+{
+ unsigned long runtime_start, runtime_end, runtime_pages;
+ unsigned long uboot_start, uboot_pages;
+ unsigned long uboot_stack_size = 16 * 1024 * 1024;
+
+ efi_add_known_memory();
/* Add U-Boot */
uboot_start = (gd->start_addr_sp - uboot_stack_size) & ~EFI_PAGE_MASK;
efi_add_memory_map(runtime_start, runtime_pages,
EFI_RUNTIME_SERVICES_CODE, false);
+#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
+ /* Request a 32bit 64MB bounce buffer region */
+ uint64_t efi_bounce_buffer_addr = 0xffffffff;
+
+ if (efi_allocate_pages(1, EFI_LOADER_DATA,
+ (64 * 1024 * 1024) >> EFI_PAGE_SHIFT,
+ &efi_bounce_buffer_addr) != EFI_SUCCESS)
+ return -1;
+
+ efi_bounce_buffer = (void*)(uintptr_t)efi_bounce_buffer_addr;
+#endif
+
return 0;
}
projects / people / ms / u-boot.git / blobdiff