[PATCHv6 3/3] memory: reserve from start_addr_sp to initial_relocaddr

[<rs@ti.com>]

From: Randolph Sapp <rs@ti.com>

Add a new global data struct member called initial_relocaddr. This
stores the original value of relocaddr, directly from setup_dest_addr.
This is specifically to avoid any adjustments made by other init
functions.

Reserve the memory from gd->start_addr_sp - CONFIG_STACK_SIZE to
gd->initial_relocaddr instead of gd->ram_top. This allows platform
specific relocation addresses to work without unnecessarily painting
over a large range.

Since PRAM comes out of this initial area up to initial_relocaddr, we no
longer need to account for it separately.

Signed-off-by: Randolph Sapp <rs@ti.com>
---
 common/board_f.c                  |  9 ++++++-
 include/asm-generic/global_data.h |  7 ++++++
 lib/efi_loader/efi_memory.c       |  2 +-
 lib/lmb.c                         | 39 +++++--------------------------
 4 files changed, 22 insertions(+), 35 deletions(-)

diff --git a/common/board_f.c b/common/board_f.c
index ce87c619e68..31c6eb725fb 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -330,6 +330,8 @@ __weak int arch_setup_dest_addr(void)
 
 static int setup_dest_addr(void)
 {
+	int ret;
+
 	debug("Monitor len: %08x\n", gd->mon_len);
 	/*
 	 * Ram is setup, size stored in gd !!
@@ -356,7 +358,12 @@ static int setup_dest_addr(void)
 	gd->relocaddr = gd->ram_top;
 	debug("Ram top: %08llX\n", (unsigned long long)gd->ram_top);
 
-	return arch_setup_dest_addr();
+	ret = arch_setup_dest_addr();
+	if (ret != 0)
+		return ret;
+
+	gd->initial_relocaddr = gd->relocaddr;
+	return ret;
 }
 
 #ifdef CFG_PRAM
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 745d2c3a966..6c60a79c2ab 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -107,6 +107,13 @@ struct global_data {
 	 * GDB using the 'add-symbol-file u-boot <relocaddr>' command.
 	 */
 	unsigned long relocaddr;
+	/**
+	 * @initial_relocaddr: end of memory currently in use by uboot
+	 *
+	 * This should be the original value of relocaddr before any other
+	 * allocations or reservations shift it.
+	 */
+	unsigned long initial_relocaddr;
 	/**
 	 * @irq_sp: IRQ stack pointer
 	 */
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 046a2bb4641..ece05c142f0 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -869,7 +869,7 @@ static void add_u_boot_and_runtime(void)
 	/* Add U-Boot */
 	uboot_start = ((uintptr_t)map_sysmem(gd->start_addr_sp, 0) -
 		       uboot_stack_size) & ~EFI_PAGE_MASK;
-	uboot_pages = ((uintptr_t)map_sysmem(gd->ram_top - 1, 0) -
+	uboot_pages = ((uintptr_t)map_sysmem(gd->initial_relocaddr, 0) -
 		       uboot_start + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
 	efi_update_memory_map(uboot_start, uboot_pages, EFI_BOOT_SERVICES_CODE,
 			      false, false);
diff --git a/lib/lmb.c b/lib/lmb.c
index 9a8c70b778a..e5d4d726ab1 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -534,46 +534,19 @@ static long lmb_reserve(phys_addr_t base, phys_size_t size, u32 flags)
 
 static void lmb_reserve_uboot_region(void)
 {
-	int bank;
-	ulong end, bank_end;
+	ulong size;
 	phys_addr_t rsv_start;
-	ulong pram = 0;
 
 	rsv_start = gd->start_addr_sp - CONFIG_STACK_SIZE;
-	end = gd->ram_top;
+	size = gd->initial_relocaddr - rsv_start;
 
-	/*
-	 * Reserve memory from aligned address below the bottom of U-Boot stack
-	 * until end of RAM area to prevent LMB from overwriting that memory.
-	 */
-	debug("## Current stack ends at 0x%08lx ", (ulong)rsv_start);
+	debug("## Current stack ends at 0x%08lx\n", (ulong)rsv_start);
 
-#ifdef CFG_PRAM
-	pram = env_get_ulong("pram", 10, CFG_PRAM);
-	pram = pram << 10; /* size is in kB */
-#endif
-
-	for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
-		if (!gd->bd->bi_dram[bank].size ||
-		    rsv_start < 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 (rsv_start > bank_end)
-			continue;
-		if (bank_end > end)
-			bank_end = end - 1;
+	lmb_reserve(rsv_start, size, LMB_NOOVERWRITE);
 
-		lmb_reserve(rsv_start, bank_end - rsv_start - pram + 1,
+	if (gd->flags & GD_FLG_SKIP_RELOC)
+		lmb_reserve((phys_addr_t)(uintptr_t)_start, gd->mon_len,
 			    LMB_NOOVERWRITE);
-
-		if (gd->flags & GD_FLG_SKIP_RELOC)
-			lmb_reserve((phys_addr_t)(uintptr_t)_start,
-				    gd->mon_len, LMB_NOOVERWRITE);
-
-		break;
-	}
 }
 
 static void lmb_reserve_common(void *fdt_blob)
-- 
2.54.0