[PATCH v3 11/27] lmb: reserve common areas during board init

[Sughosh Ganu]

The LMB module provides API's for allocating and reserving chunks of
memory which is then typically used for things like loading images for
booting. Reserve the portion of memory that is occupied by the U-Boot
image itself, and other parts of memory that might have been marked as
reserved in the board's DTB. When executing in SPL, reserve the
sections that get relocated to the ram memory, the stack and
the global data structure and also the bss.

Mark these regions of memory with the LMB_NOOVERWRITE flag to indicate
that these regions cannot be re-requested or overwritten.

Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
Changes since V2: None

 lib/lmb.c | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/lib/lmb.c b/lib/lmb.c
index b07235247f..f94f620a37 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -13,6 +13,7 @@
 #include <lmb.h>
 #include <log.h>
 #include <malloc.h>
+#include <spl.h>
 
 #include <asm/global_data.h>
 #include <asm/sections.h>
@@ -172,10 +173,11 @@ void arch_lmb_reserve_generic(ulong sp, ulong end, ulong align)
 		if (bank_end > end)
 			bank_end = end - 1;
 
-		lmb_reserve(sp, bank_end - sp + 1);
+		lmb_reserve_flags(sp, bank_end - sp + 1, LMB_NOOVERWRITE);
 
 		if (gd->flags & GD_FLG_SKIP_RELOC)
-			lmb_reserve((phys_addr_t)(uintptr_t)_start, gd->mon_len);
+			lmb_reserve_flags((phys_addr_t)(uintptr_t)_start,
+				    gd->mon_len, LMB_NOOVERWRITE);
 
 		break;
 	}
@@ -246,6 +248,30 @@ void lmb_init_and_reserve_range(phys_addr_t base, phys_size_t size,
 	lmb_reserve_common(fdt_blob);
 }
 
+static __maybe_unused void lmb_reserve_common_spl(void)
+{
+	phys_addr_t rsv_start;
+	phys_size_t rsv_size;
+
+	/*
+	 * Assume a SPL stack of 16KB. This must be
+	 * more than enough for the SPL stage.
+	 */
+	if (IS_ENABLED(CONFIG_SPL_STACK_R_ADDR)) {
+		rsv_start = gd->start_addr_sp - 16384;
+		rsv_size = 16384;
+		lmb_reserve_flags(rsv_start, rsv_size, LMB_NOOVERWRITE);
+	}
+
+	if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS)) {
+		/* Reserve the bss region */
+		rsv_start = (phys_addr_t)(uintptr_t)__bss_start;
+		rsv_size = (phys_addr_t)(uintptr_t)__bss_end -
+			(phys_addr_t)(uintptr_t)__bss_start;
+		lmb_reserve_flags(rsv_start, rsv_size, LMB_NOOVERWRITE);
+	}
+}
+
 /**
  * lmb_add_memory() - Add memory range for LMB allocations
  *
@@ -734,6 +760,12 @@ int lmb_init(void)
 
 	lmb_add_memory();
 
+	/* Reserve the U-Boot image region once U-Boot has relocated */
+	if (spl_phase() == PHASE_SPL)
+		lmb_reserve_common_spl();
+	else if (spl_phase() == PHASE_BOARD_R)
+		lmb_reserve_common((void *)gd->fdt_blob);
+
 	return 0;
 }
 
-- 
2.34.1