Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / armv7 / cpu.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/armv7/cpu.c b/qemu/roms/u-boot/arch/arm/cpu/armv7/cpu.c
new file mode 100644 (file)
index 0000000..01cdb7e
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/armv7/cpu.c
@@ -0,0 +1,70 @@
+/*
+ * (C) Copyright 2008 Texas Insturments
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/system.h>
+#include <asm/cache.h>
+#include <asm/armv7.h>
+#include <linux/compiler.h>
+
+void __weak cpu_cache_initialization(void){}
+
+int cleanup_before_linux(void)
+{
+       /*
+        * this function is called just before we call linux
+        * it prepares the processor for linux
+        *
+        * we turn off caches etc ...
+        */
+#ifndef CONFIG_SPL_BUILD
+       disable_interrupts();
+#endif
+
+       /*
+        * Turn off I-cache and invalidate it
+        */
+       icache_disable();
+       invalidate_icache_all();
+
+       /*
+        * turn off D-cache
+        * dcache_disable() in turn flushes the d-cache and disables MMU
+        */
+       dcache_disable();
+       v7_outer_cache_disable();
+
+       /*
+        * After D-cache is flushed and before it is disabled there may
+        * be some new valid entries brought into the cache. We are sure
+        * that these lines are not dirty and will not affect our execution.
+        * (because unwinding the call-stack and setting a bit in CP15 SCTRL
+        * is all we did during this. We have not pushed anything on to the
+        * stack. Neither have we affected any static data)
+        * So just invalidate the entire d-cache again to avoid coherency
+        * problems for kernel
+        */
+       invalidate_dcache_all();
+
+       /*
+        * Some CPU need more cache attention before starting the kernel.
+        */
+       cpu_cache_initialization();
+
+       return 0;
+}