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lmb: Add generic arch_lmb_reserve_generic()

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The arc/arm/m68k/microblaze/mips/ppc arch_lmb_reserve() implementations
are all mostly the same, except for a couple of details. Implement a
generic arch_lmb_reserve_generic() function which can be parametrized
enough to cater for those differences between architectures. This can
also be parametrized enough so it can handle cases where U-Boot is not
relocated to the end of DRAM e.g. because there is some other reserved
memory past U-Boot (e.g. unmovable firmware for coprocessor), it is not
relocated at all, and other such use cases.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Alexey Brodkin <alexey.brodkin@synopsys.com>
Cc: Angelo Dureghello <angelo@sysam.it>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Cc: Hai Pham <hai.pham.ud@renesas.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Wolfgang Denk <wd@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Marek Vasut 2021-09-10 22:47:09 +02:00 committed by Tom Rini
parent cfa1971977
commit 1274698d13
2 changed files with 36 additions and 0 deletions
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1
include/lmb.h
View file

@ -122,6 +122,7 @@ lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
void board_lmb_reserve(struct lmb *lmb);
void arch_lmb_reserve(struct lmb *lmb);
void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align);
/* Low level functions */

35
lib/lmb.c
View file

@ -12,6 +12,10 @@
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
#define LMB_ALLOC_ANYWHERE 0
static void lmb_dump_region(struct lmb_region *rgn, char *name)
@ -113,6 +117,37 @@ void lmb_init(struct lmb *lmb)
lmb->reserved.cnt = 0;
}
void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align)
{
ulong bank_end;
int bank;
/*
* Reserve memory from aligned address below the bottom of U-Boot stack
* until end of U-Boot area using LMB to prevent U-Boot from overwriting
* that memory.
*/
debug("## Current stack ends at 0x%08lx ", sp);
/* adjust sp by 4K to be safe */
sp -= align;
for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
if (!gd->bd->bi_dram[bank].size ||
sp < gd->bd->bi_dram[bank].start)
continue;
/* Watch out for RAM at end of address space! */
bank_end = gd->bd->bi_dram[bank].start +
gd->bd->bi_dram[bank].size - 1;
if (sp > bank_end)
continue;
if (bank_end > end)
bank_end = end - 1;
lmb_reserve(lmb, sp, bank_end - sp + 1);
break;
}
}
static void lmb_reserve_common(struct lmb *lmb, void *fdt_blob)
{
arch_lmb_reserve(lmb);