sandbox: implement reset
Up to now the sandbox would shutdown upon a cold reset request. Instead it
should be reset.
In our coding we use static variables like LIST_HEAD(efi_obj_list). A reset
can occur at any time, e.g. via an UEFI binary calling the reset service.
The only safe way to return to an initial state is to relaunch the U-Boot
binary.
The reset implementation uses execv() to relaunch U-Boot.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/include/asm/u-boot-sandbox.h b/arch/sandbox/include/asm/u-boot-sandbox.h
index 798d003..73b1897 100644
--- a/arch/sandbox/include/asm/u-boot-sandbox.h
+++ b/arch/sandbox/include/asm/u-boot-sandbox.h
@@ -84,6 +84,16 @@
*/
int sandbox_read_fdt_from_file(void);
+/**
+ * sandbox_reset() - reset sandbox
+ *
+ * This functions implements the cold reboot of the sandbox. It relaunches the
+ * U-Boot binary with the same command line parameters as the original call.
+ * The PID of the process stays the same. All file descriptors that have not
+ * been opened with O_CLOEXEC stay open including stdin, stdout, stderr.
+ */
+void sandbox_reset(void);
+
/* Exit sandbox (quit U-Boot) */
void sandbox_exit(void);