riscv: add support to block smp in each stage

Each stage performs some basic initialization (stack, HLS etc) and then
call smp_pause to enter the single-threaded state. The main work of each
stage is executed in a single-threaded state, and the multi-threaded
state is restored by call smp_resume while booting the next stage.

Change-Id: I8d508c3d0f65a022010e74f8edad7ad2cfdc7dee
Signed-off-by: Xiang Wang <wxjstz@126.com>
Reviewed-on: https://review.coreboot.org/29024
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Philipp Hug <philipp@hug.cx>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/arch/riscv/boot.c b/src/arch/riscv/boot.c
index e1dc61955b..04fba07234 100644
--- a/src/arch/riscv/boot.c
+++ b/src/arch/riscv/boot.c
@@ -19,6 +19,7 @@
 #include <arch/encoding.h>
 #include <rules.h>
 #include <console/console.h>
+#include <arch/smp/smp.h>
 
 /*
  * A pointer to the Flattened Device Tree passed to coreboot by the boot ROM.
@@ -28,7 +29,7 @@
  */
 const void *rom_fdt;
 
-void arch_prog_run(struct prog *prog)
+static void do_arch_prog_run(struct prog *prog)
 {
 	void (*doit)(void *) = prog_entry(prog);
 	void riscvpayload(const void *fdt, void *payload);
@@ -48,3 +49,8 @@ void arch_prog_run(struct prog *prog)
 
 	doit(prog_entry_arg(prog));
 }
+
+void arch_prog_run(struct prog *prog)
+{
+	smp_resume((void (*)(void *))do_arch_prog_run, prog);
+}