x86: Drop -Wa,--divide

Fix up all the code that is using / to use >> for divisions instead.

Change-Id: I8a6deb0aa090e0df71d90a5509c911b295833cea
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10819
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/amd/car/cache_as_ram.inc

@@ -240,15 +240,15 @@ clear_fixed_var_mtrr_out:
  * windowoffset is the 32k-aligned window into CAR size.
  */
 .macro simplemask carsize, windowoffset
-	.set gas_bug_workaround,(((\carsize - \windowoffset) / 0x1000) - 4)
+	.set gas_bug_workaround,(((\carsize - \windowoffset) >> 12) - 4)
 	extractmask gas_bug_workaround, %eax
-	.set gas_bug_workaround,(((\carsize - \windowoffset) / 0x1000))
+	.set gas_bug_workaround,(((\carsize - \windowoffset) >> 12))
 	extractmask gas_bug_workaround, %edx
 	/*
 	 * Without the gas bug workaround, the entire macro would consist
 	 * only of the two lines below:
-	 *   extractmask (((\carsize - \windowoffset) / 0x1000) - 4), %eax
-	 *   extractmask (((\carsize - \windowoffset) / 0x1000)), %edx
+	 *   extractmask (((\carsize - \windowoffset) >> 12) - 4), %eax
+	 *   extractmask (((\carsize - \windowoffset) >> 12)), %edx
 	 */
 .endm
 

src/cpu/amd/geode_gx2/cache_as_ram.inc

@@ -166,7 +166,7 @@ done_cache_as_ram_main:
 	/* We now run over the stack-in-cache, copying it back to itself to invalidate the cache */
 
 	push   %edi
-	mov    $(CONFIG_DCACHE_RAM_SIZE/4),%ecx
+	mov    $(CONFIG_DCACHE_RAM_SIZE >> 2),%ecx
 	push   %esi
 	mov    $(CONFIG_DCACHE_RAM_BASE),%edi
 	mov    %edi,%esi

src/cpu/amd/geode_lx/cache_as_ram.inc

@@ -192,7 +192,7 @@ done_cache_as_ram_main:
 	 * copying it back to itself to invalidate the cache */
 
 	push   %edi
-	mov    $(CONFIG_DCACHE_RAM_SIZE/4),%ecx
+	mov    $(CONFIG_DCACHE_RAM_SIZE >> 2),%ecx
 	push   %esi
 	mov    $(CONFIG_DCACHE_RAM_BASE),%edi
 	mov    %edi,%esi