microblaze: Define arch_lmb_reserve
arch_lmb_reserve() protects U-Boot relocated code with stack not to be used
for image relocation.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/lib/bootm.c b/arch/microblaze/lib/bootm.c
index ec33294..a74f1d1 100644
--- a/arch/microblaze/lib/bootm.c
+++ b/arch/microblaze/lib/bootm.c
@@ -15,6 +15,47 @@
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong get_sp(void)
+{
+ ulong ret;
+
+ asm("addik %0, r1, 0" : "=r"(ret) : );
+ return ret;
+}
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+ ulong sp, bank_end;
+ int bank;
+
+ /*
+ * Booting a (Linux) kernel image
+ *
+ * Allocate space for command line and board info - the
+ * address should be as high as possible within the reach of
+ * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
+ * memory, which means far enough below the current stack
+ * pointer.
+ */
+ sp = get_sp();
+ debug("## Current stack ends at 0x%08lx ", sp);
+
+ /* adjust sp by 4K to be safe */
+ sp -= 4096;
+ for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
+ if (sp < gd->bd->bi_dram[bank].start)
+ continue;
+ bank_end = gd->bd->bi_dram[bank].start +
+ gd->bd->bi_dram[bank].size;
+ if (sp >= bank_end)
+ continue;
+ lmb_reserve(lmb, sp, bank_end - sp);
+ break;
+ }
+}
+
int do_bootm_linux(int flag, int argc, char * const argv[],
bootm_headers_t *images)
{