coreboot: introduce arch_payload_run()

The selfboot() function relied on global variables
within the selfboot.c compilation unit. Now that the
bounce buffer is a part of struct payload use a new
architecture-specific arch_payload_run() function
for jumping to the payload. selfboot() can then be
removed.

Change-Id: Icec74942e94599542148561b3311ce5096ac5ea5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5300
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/arch/armv7/boot.c

@@ -19,9 +19,10 @@
 
 #include <console/console.h>
 #include <arch/stages.h>
+#include <payload_loader.h>
 
-void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size)
+void arch_payload_run(const struct payload *payload)
 {
-	printk(BIOS_SPEW, "entry    = %p\n", entry);
-	stage_exit(entry);
+	printk(BIOS_SPEW, "entry    = %p\n", payload->entry);
+	stage_exit(payload->entry);
 }

src/arch/armv7/include/arch/stages.h

@@ -24,6 +24,5 @@ extern void main(void);
 
 void stage_entry(void) __attribute__((section(".text.stage_entry.armv7")));
 void stage_exit(void *);
-void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size);
 
 #endif

src/arch/x86/boot/boot.c

@@ -1,12 +1,12 @@
 #include <console/console.h>
 #include <arch/stages.h>
+#include <payload_loader.h>
 #include <ip_checksum.h>
 #include <string.h>
 
-#if CONFIG_RELOCATABLE_RAMSTAGE
 /* When the ramstage is relocatable the elf loading ensures an elf image cannot
  * be loaded over the ramstage code. */
-void jmp_to_elf_entry(void *entry, unsigned long unused1, unsigned long unused2)
+static void jmp_payload_no_bounce_buffer(void *entry)
 {
 	/* Jump to kernel */
 	__asm__ __volatile__(
@@ -22,8 +22,8 @@ void jmp_to_elf_entry(void *entry, unsigned long unused1, unsigned long unused2)
 		"r" (entry)
 		);
 }
-#else
-void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size)
+
+static void jmp_payload(void *entry, unsigned long buffer, unsigned long size)
 {
 	extern unsigned char _ram_seg, _eram_seg;
 	unsigned long lb_start, lb_size;
@@ -122,6 +122,12 @@ void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size)
 		"ri"(0), "ri" (0)
 		);
 }
-#endif /* CONFIG_RELOCATABLE_RAMSTAGE */
-
 
+void arch_payload_run(const struct payload *payload)
+{
+	if (IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE))
+		jmp_payload_no_bounce_buffer(payload->entry);
+	else
+		jmp_payload(payload->entry, (uintptr_t)payload->bounce.data,
+				payload->bounce.size);
+}

src/arch/x86/include/arch/stages.h

@@ -23,7 +23,6 @@
 #include <arch/cpu.h>
 
 void asmlinkage copy_and_run(void);
-void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size);
 
 static inline void stage_exit(void *entry)
 {

src/include/payload_loader.h

@@ -44,6 +44,9 @@ struct payload *payload_load(void);
 /* Run the loaded payload. */
 void payload_run(const struct payload *payload);
 
+/* architecture specific function to run payload. */
+void arch_payload_run(const struct payload *payload);
+
 /* Payload loading operations. */
 struct payload_loader_ops {
 	const char *name;
@@ -57,6 +60,5 @@ struct payload_loader_ops {
 /* Defined in src/lib/selfboot.c */
 struct lb_memory;
 void *selfload(struct lb_memory *mem, struct payload *payload);
-void selfboot(void *entry);
 
 #endif  /* PAYLOAD_LOADER_H */

src/lib/loaders/load_and_run_payload.c

@@ -93,5 +93,5 @@ void payload_run(const struct payload *payload)
 	 */
 	checkstack(_estack, 0);
 
-	selfboot(payload->entry);
+	arch_payload_run(payload);
 }

src/lib/selfboot.c

@@ -19,7 +19,6 @@
  */
 
 #include <arch/byteorder.h>
-#include <arch/stages.h>
 #include <console/console.h>
 #include <cpu/cpu.h>
 #include <boot/coreboot_tables.h>
@@ -526,9 +525,3 @@ void *selfload(struct lb_memory *mem, struct payload *payload)
 out:
 	return NULL;
 }
-
-void selfboot(void *entry)
-{
-	/* Jump to kernel */
-	jmp_to_elf_entry(entry, bounce_buffer, bounce_size);
-}