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 (file)
--- 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)
 {