mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
f739fcd831
As part of the main conversion a few files were missed. These files had
additional whitespace after the '*' and before the SPDX tag and my
previous regex was too strict. This time I did a grep for all SPDX tags
and then filtered out anything that matched the correct styles.
Fixes: 83d290c56f
("SPDX: Convert all of our single license tags to Linux Kernel style")
Reported-by: Heinrich Schuchardt <xypron.debian@gmx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
528 lines
14 KiB
C
528 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI application memory management
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#include <common.h>
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#include <efi_loader.h>
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#include <inttypes.h>
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#include <malloc.h>
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#include <watchdog.h>
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#include <asm/global_data.h>
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#include <linux/list_sort.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct efi_mem_list {
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struct list_head link;
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struct efi_mem_desc desc;
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};
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#define EFI_CARVE_NO_OVERLAP -1
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#define EFI_CARVE_LOOP_AGAIN -2
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#define EFI_CARVE_OVERLAPS_NONRAM -3
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/* This list contains all memory map items */
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LIST_HEAD(efi_mem);
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#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
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void *efi_bounce_buffer;
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#endif
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/*
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* U-Boot services each EFI AllocatePool request as a separate
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* (multiple) page allocation. We have to track the number of pages
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* to be able to free the correct amount later.
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* EFI requires 8 byte alignment for pool allocations, so we can
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* prepend each allocation with an 64 bit header tracking the
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* allocation size, and hand out the remainder to the caller.
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*/
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struct efi_pool_allocation {
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u64 num_pages;
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char data[] __aligned(ARCH_DMA_MINALIGN);
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};
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/*
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* Sorts the memory list from highest address to lowest address
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*
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* When allocating memory we should always start from the highest
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* address chunk, so sort the memory list such that the first list
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* iterator gets the highest address and goes lower from there.
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*/
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static int efi_mem_cmp(void *priv, struct list_head *a, struct list_head *b)
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{
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struct efi_mem_list *mema = list_entry(a, struct efi_mem_list, link);
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struct efi_mem_list *memb = list_entry(b, struct efi_mem_list, link);
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if (mema->desc.physical_start == memb->desc.physical_start)
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return 0;
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else if (mema->desc.physical_start < memb->desc.physical_start)
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return 1;
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else
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return -1;
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}
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static void efi_mem_sort(void)
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{
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list_sort(NULL, &efi_mem, efi_mem_cmp);
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}
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/*
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* Unmaps all memory occupied by the carve_desc region from the
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* list entry pointed to by map.
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*
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* Returns EFI_CARVE_NO_OVERLAP if the regions don't overlap.
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* Returns EFI_CARVE_OVERLAPS_NONRAM if the carve and map overlap,
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* and the map contains anything but free ram.
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* (only when overlap_only_ram is true)
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* Returns EFI_CARVE_LOOP_AGAIN if the mapping list should be traversed
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* again, as it has been altered
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* Returns the number of overlapping pages. The pages are removed from
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* the mapping list.
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*
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* In case of EFI_CARVE_OVERLAPS_NONRAM it is the callers responsibility
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* to readd the already carved out pages to the mapping.
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*/
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static int efi_mem_carve_out(struct efi_mem_list *map,
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struct efi_mem_desc *carve_desc,
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bool overlap_only_ram)
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{
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struct efi_mem_list *newmap;
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struct efi_mem_desc *map_desc = &map->desc;
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uint64_t map_start = map_desc->physical_start;
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uint64_t map_end = map_start + (map_desc->num_pages << EFI_PAGE_SHIFT);
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uint64_t carve_start = carve_desc->physical_start;
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uint64_t carve_end = carve_start +
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(carve_desc->num_pages << EFI_PAGE_SHIFT);
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/* check whether we're overlapping */
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if ((carve_end <= map_start) || (carve_start >= map_end))
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return EFI_CARVE_NO_OVERLAP;
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/* We're overlapping with non-RAM, warn the caller if desired */
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if (overlap_only_ram && (map_desc->type != EFI_CONVENTIONAL_MEMORY))
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return EFI_CARVE_OVERLAPS_NONRAM;
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/* Sanitize carve_start and carve_end to lie within our bounds */
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carve_start = max(carve_start, map_start);
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carve_end = min(carve_end, map_end);
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/* Carving at the beginning of our map? Just move it! */
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if (carve_start == map_start) {
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if (map_end == carve_end) {
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/* Full overlap, just remove map */
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list_del(&map->link);
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free(map);
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} else {
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map->desc.physical_start = carve_end;
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map->desc.num_pages = (map_end - carve_end)
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>> EFI_PAGE_SHIFT;
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}
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return (carve_end - carve_start) >> EFI_PAGE_SHIFT;
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}
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/*
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* Overlapping maps, just split the list map at carve_start,
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* it will get moved or removed in the next iteration.
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*
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* [ map_desc |__carve_start__| newmap ]
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*/
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/* Create a new map from [ carve_start ... map_end ] */
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newmap = calloc(1, sizeof(*newmap));
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newmap->desc = map->desc;
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newmap->desc.physical_start = carve_start;
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newmap->desc.num_pages = (map_end - carve_start) >> EFI_PAGE_SHIFT;
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/* Insert before current entry (descending address order) */
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list_add_tail(&newmap->link, &map->link);
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/* Shrink the map to [ map_start ... carve_start ] */
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map_desc->num_pages = (carve_start - map_start) >> EFI_PAGE_SHIFT;
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return EFI_CARVE_LOOP_AGAIN;
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}
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uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
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bool overlap_only_ram)
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{
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struct list_head *lhandle;
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struct efi_mem_list *newlist;
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bool carve_again;
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uint64_t carved_pages = 0;
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debug("%s: 0x%" PRIx64 " 0x%" PRIx64 " %d %s\n", __func__,
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start, pages, memory_type, overlap_only_ram ? "yes" : "no");
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if (!pages)
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return start;
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newlist = calloc(1, sizeof(*newlist));
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newlist->desc.type = memory_type;
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newlist->desc.physical_start = start;
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newlist->desc.virtual_start = start;
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newlist->desc.num_pages = pages;
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switch (memory_type) {
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case EFI_RUNTIME_SERVICES_CODE:
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case EFI_RUNTIME_SERVICES_DATA:
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newlist->desc.attribute = (1 << EFI_MEMORY_WB_SHIFT) |
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(1ULL << EFI_MEMORY_RUNTIME_SHIFT);
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break;
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case EFI_MMAP_IO:
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newlist->desc.attribute = 1ULL << EFI_MEMORY_RUNTIME_SHIFT;
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break;
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default:
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newlist->desc.attribute = 1 << EFI_MEMORY_WB_SHIFT;
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break;
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}
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/* Add our new map */
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do {
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carve_again = false;
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list_for_each(lhandle, &efi_mem) {
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struct efi_mem_list *lmem;
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int r;
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lmem = list_entry(lhandle, struct efi_mem_list, link);
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r = efi_mem_carve_out(lmem, &newlist->desc,
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overlap_only_ram);
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switch (r) {
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case EFI_CARVE_OVERLAPS_NONRAM:
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/*
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* The user requested to only have RAM overlaps,
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* but we hit a non-RAM region. Error out.
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*/
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return 0;
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case EFI_CARVE_NO_OVERLAP:
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/* Just ignore this list entry */
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break;
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case EFI_CARVE_LOOP_AGAIN:
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/*
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* We split an entry, but need to loop through
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* the list again to actually carve it.
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*/
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carve_again = true;
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break;
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default:
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/* We carved a number of pages */
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carved_pages += r;
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carve_again = true;
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break;
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}
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if (carve_again) {
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/* The list changed, we need to start over */
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break;
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}
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}
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} while (carve_again);
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if (overlap_only_ram && (carved_pages != pages)) {
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/*
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* The payload wanted to have RAM overlaps, but we overlapped
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* with an unallocated region. Error out.
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*/
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return 0;
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}
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/* Add our new map */
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list_add_tail(&newlist->link, &efi_mem);
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/* And make sure memory is listed in descending order */
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efi_mem_sort();
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return start;
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}
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static uint64_t efi_find_free_memory(uint64_t len, uint64_t max_addr)
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{
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struct list_head *lhandle;
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list_for_each(lhandle, &efi_mem) {
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struct efi_mem_list *lmem = list_entry(lhandle,
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struct efi_mem_list, link);
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struct efi_mem_desc *desc = &lmem->desc;
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uint64_t desc_len = desc->num_pages << EFI_PAGE_SHIFT;
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uint64_t desc_end = desc->physical_start + desc_len;
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uint64_t curmax = min(max_addr, desc_end);
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uint64_t ret = curmax - len;
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/* We only take memory from free RAM */
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if (desc->type != EFI_CONVENTIONAL_MEMORY)
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continue;
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/* Out of bounds for max_addr */
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if ((ret + len) > max_addr)
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continue;
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/* Out of bounds for upper map limit */
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if ((ret + len) > desc_end)
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continue;
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/* Out of bounds for lower map limit */
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if (ret < desc->physical_start)
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continue;
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/* Return the highest address in this map within bounds */
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return ret;
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}
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return 0;
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}
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/*
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* Allocate memory pages.
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*
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* @type type of allocation to be performed
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* @memory_type usage type of the allocated memory
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* @pages number of pages to be allocated
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* @memory allocated memory
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* @return status code
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*/
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efi_status_t efi_allocate_pages(int type, int memory_type,
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efi_uintn_t pages, uint64_t *memory)
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{
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u64 len = pages << EFI_PAGE_SHIFT;
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efi_status_t r = EFI_SUCCESS;
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uint64_t addr;
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switch (type) {
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case EFI_ALLOCATE_ANY_PAGES:
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/* Any page */
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addr = efi_find_free_memory(len, gd->start_addr_sp);
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if (!addr) {
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r = EFI_NOT_FOUND;
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break;
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}
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break;
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case EFI_ALLOCATE_MAX_ADDRESS:
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/* Max address */
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addr = efi_find_free_memory(len, *memory);
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if (!addr) {
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r = EFI_NOT_FOUND;
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break;
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}
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break;
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case EFI_ALLOCATE_ADDRESS:
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/* Exact address, reserve it. The addr is already in *memory. */
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addr = *memory;
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break;
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default:
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/* UEFI doesn't specify other allocation types */
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r = EFI_INVALID_PARAMETER;
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break;
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}
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if (r == EFI_SUCCESS) {
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uint64_t ret;
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/* Reserve that map in our memory maps */
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ret = efi_add_memory_map(addr, pages, memory_type, true);
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if (ret == addr) {
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*memory = addr;
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} else {
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/* Map would overlap, bail out */
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r = EFI_OUT_OF_RESOURCES;
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}
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}
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return r;
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}
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void *efi_alloc(uint64_t len, int memory_type)
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{
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uint64_t ret = 0;
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uint64_t pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
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efi_status_t r;
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r = efi_allocate_pages(0, memory_type, pages, &ret);
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if (r == EFI_SUCCESS)
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return (void*)(uintptr_t)ret;
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return NULL;
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}
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/*
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* Free memory pages.
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*
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* @memory start of the memory area to be freed
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* @pages number of pages to be freed
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* @return status code
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*/
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efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
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{
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uint64_t r = 0;
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r = efi_add_memory_map(memory, pages, EFI_CONVENTIONAL_MEMORY, false);
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/* Merging of adjacent free regions is missing */
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if (r == memory)
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return EFI_SUCCESS;
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return EFI_NOT_FOUND;
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}
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/*
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* Allocate memory from pool.
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*
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* @pool_type type of the pool from which memory is to be allocated
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* @size number of bytes to be allocated
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* @buffer allocated memory
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* @return status code
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*/
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efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size, void **buffer)
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{
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efi_status_t r;
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efi_physical_addr_t t;
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u64 num_pages = (size + sizeof(struct efi_pool_allocation) +
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EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
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if (size == 0) {
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*buffer = NULL;
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return EFI_SUCCESS;
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}
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r = efi_allocate_pages(0, pool_type, num_pages, &t);
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if (r == EFI_SUCCESS) {
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struct efi_pool_allocation *alloc = (void *)(uintptr_t)t;
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alloc->num_pages = num_pages;
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*buffer = alloc->data;
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}
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return r;
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}
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/*
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* Free memory from pool.
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*
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* @buffer start of memory to be freed
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* @return status code
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*/
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efi_status_t efi_free_pool(void *buffer)
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{
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efi_status_t r;
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struct efi_pool_allocation *alloc;
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if (buffer == NULL)
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return EFI_INVALID_PARAMETER;
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alloc = container_of(buffer, struct efi_pool_allocation, data);
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/* Sanity check, was the supplied address returned by allocate_pool */
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assert(((uintptr_t)alloc & EFI_PAGE_MASK) == 0);
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r = efi_free_pages((uintptr_t)alloc, alloc->num_pages);
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return r;
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}
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/*
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* Get map describing memory usage.
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*
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* @memory_map_size on entry the size, in bytes, of the memory map buffer,
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* on exit the size of the copied memory map
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* @memory_map buffer to which the memory map is written
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* @map_key key for the memory map
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* @descriptor_size size of an individual memory descriptor
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* @descriptor_version version number of the memory descriptor structure
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* @return status code
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*/
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efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
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struct efi_mem_desc *memory_map,
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efi_uintn_t *map_key,
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efi_uintn_t *descriptor_size,
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uint32_t *descriptor_version)
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{
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efi_uintn_t map_size = 0;
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int map_entries = 0;
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struct list_head *lhandle;
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efi_uintn_t provided_map_size = *memory_map_size;
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list_for_each(lhandle, &efi_mem)
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map_entries++;
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map_size = map_entries * sizeof(struct efi_mem_desc);
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*memory_map_size = map_size;
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if (provided_map_size < map_size)
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return EFI_BUFFER_TOO_SMALL;
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if (descriptor_size)
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*descriptor_size = sizeof(struct efi_mem_desc);
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if (descriptor_version)
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*descriptor_version = EFI_MEMORY_DESCRIPTOR_VERSION;
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/* Copy list into array */
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if (memory_map) {
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/* Return the list in ascending order */
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memory_map = &memory_map[map_entries - 1];
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list_for_each(lhandle, &efi_mem) {
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struct efi_mem_list *lmem;
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lmem = list_entry(lhandle, struct efi_mem_list, link);
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*memory_map = lmem->desc;
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memory_map--;
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}
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}
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*map_key = 0;
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return EFI_SUCCESS;
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}
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__weak void efi_add_known_memory(void)
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{
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int i;
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/* Add RAM */
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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u64 ram_start = gd->bd->bi_dram[i].start;
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u64 ram_size = gd->bd->bi_dram[i].size;
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u64 start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
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u64 pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
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efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
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false);
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}
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}
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int efi_memory_init(void)
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{
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unsigned long runtime_start, runtime_end, runtime_pages;
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unsigned long uboot_start, uboot_pages;
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unsigned long uboot_stack_size = 16 * 1024 * 1024;
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efi_add_known_memory();
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/* Add U-Boot */
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uboot_start = (gd->start_addr_sp - uboot_stack_size) & ~EFI_PAGE_MASK;
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uboot_pages = (gd->ram_top - uboot_start) >> EFI_PAGE_SHIFT;
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efi_add_memory_map(uboot_start, uboot_pages, EFI_LOADER_DATA, false);
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/* Add Runtime Services */
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runtime_start = (ulong)&__efi_runtime_start & ~EFI_PAGE_MASK;
|
|
runtime_end = (ulong)&__efi_runtime_stop;
|
|
runtime_end = (runtime_end + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
|
|
runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
|
|
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;
|
|
}
|