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https://github.com/brain-hackers/u-boot-brain
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![Andreas Färber](/assets/img/avatar_default.png)
jetson-tk1 has 2 GB of RAM at 0x80000000, causing gd->ram_top to be zero. Handle this by either avoiding ram_top or by using the same type as ram_top to reverse the overflow effect. Cc: Alexander Graf <agraf@suse.de> Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Alexander Graf <agraf@suse.de>
354 lines
8.8 KiB
C
354 lines
8.8 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* #define DEBUG_EFI */
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#include <common.h>
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#include <efi_loader.h>
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#include <malloc.h>
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#include <asm/global_data.h>
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#include <libfdt_env.h>
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#include <linux/list_sort.h>
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#include <inttypes.h>
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#include <watchdog.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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/* This list contains all memory map items */
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LIST_HEAD(efi_mem);
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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 1 if carving was performed or 0 if the regions don't overlap.
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* Returns -1 if it would affect non-RAM regions but overlap_only_ram is set.
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* Carving is only guaranteed to complete when all regions return 0.
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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 0;
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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 -1;
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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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}
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map_desc->physical_start = carve_end;
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map_desc->num_pages = (map_end - carve_end) >> EFI_PAGE_SHIFT;
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return 1;
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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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list_add_tail(&newmap->link, &efi_mem);
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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 1;
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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 do_carving;
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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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do_carving = 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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if (r < 0) {
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return 0;
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} else if (r) {
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do_carving = true;
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break;
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}
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}
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} while (do_carving);
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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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efi_status_t efi_allocate_pages(int type, int memory_type,
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unsigned long 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 0:
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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 1:
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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 2:
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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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efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
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{
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/* We don't free, let's cross our fingers we have plenty RAM */
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return EFI_SUCCESS;
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}
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efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
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struct efi_mem_desc *memory_map,
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unsigned long *map_key,
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unsigned long *descriptor_size,
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uint32_t *descriptor_version)
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{
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ulong map_size = 0;
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int map_entries = 0;
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struct list_head *lhandle;
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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 (descriptor_size)
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*descriptor_size = sizeof(struct efi_mem_desc);
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if (*memory_map_size < map_size)
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return EFI_BUFFER_TOO_SMALL;
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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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return EFI_SUCCESS;
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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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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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/* 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;
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runtime_end = (ulong)&__efi_runtime_stop;
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runtime_end = (runtime_end + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
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runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
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efi_add_memory_map(runtime_start, runtime_pages,
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EFI_RUNTIME_SERVICES_CODE, false);
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return 0;
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}
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