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lmb: add and reserve memory above ram_top

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U-Boot does not use memory above ram_top. However, this memory does
need to get registered as part of the memory map, so that subsystems
like EFI pass it on to the operating system as part of the EFI memory
map. Add memory above ram_top and reserve it with the LMB_NOOVERWRITE
flag so that it does not get allocated or re-used.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Suggested-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Sughosh Ganu 2024-10-15 21:07:05 +05:30 • committed by Tom Rini
parent 3c6896ad2f
commit eb052cbb89
1 changed files with 9 additions and 10 deletions
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19
lib/lmb.c
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@ -281,7 +281,6 @@ void lmb_add_memory(void)
{
int i;
phys_size_t size;
phys_addr_t rgn_top;
u64 ram_top = gd->ram_top;
struct bd_info *bd = gd->bd;
@ -292,16 +291,16 @@ void lmb_add_memory(void)
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
size = bd->bi_dram[i].size;
if (size) {
if (bd->bi_dram[i].start > ram_top)
continue;
rgn_top = bd->bi_dram[i].start +
bd->bi_dram[i].size;
if (rgn_top > ram_top)
size -= rgn_top - ram_top;
lmb_add(bd->bi_dram[i].start, size);
/*
* Reserve memory above ram_top as
* no-overwrite so that it cannot be
* allocated
*/
if (bd->bi_dram[i].start >= ram_top)
lmb_reserve_flags(bd->bi_dram[i].start, size,
LMB_NOOVERWRITE);
}
}
}