[coreboot-gerrit] Change in coreboot[master]: arch/arm: Enable booting Linux payloads

[Sam Lewis (Code Review)]

Sam Lewis has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/44376 )

Change subject: arch/arm: Enable booting Linux payloads
......................................................................

arch/arm: Enable booting Linux payloads

Enables booting in a Linux kernel payload with the calling convention
the kernel requires. As there is no method in coreboot to check the type
of payload being booted (Linux or otherwise) this assumes any payload is
a Linux payload.

Change-Id: If50c834c8f434bc02dee8f84370d1dbf8f9b69e2
Signed-off-by: Sam Lewis 
---
M src/arch/arm/boot.c
1 file changed, 16 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/44376/1

diff --git a/src/arch/arm/boot.c b/src/arch/arm/boot.c
index 8c876de..fc87f2c 100644
--- a/src/arch/arm/boot.c
+++ b/src/arch/arm/boot.c
@@ -3,12 +3,28 @@
 #include <arch/cache.h>
 #include <program_loading.h>

+static void run_linux_payload(struct prog *prog)
+{
+	void (*kernel_entry)(void *sbz, void *sbo, void *dtb);
+	void *fdt;
+
+	kernel_entry = prog_entry(prog);
+	fdt = prog_entry_arg(prog);
+	kernel_entry(0, (void *)~0, fdt);
+}
+
 void arch_prog_run(struct prog *prog)
 {
    void (*doit)(void *);

cache_sync_instructions();

+	if (ENV_RAMSTAGE && prog_type(prog) == PROG_PAYLOAD) {
+		dcache_mmu_disable();
+		run_linux_payload(prog);
+		return;
+	}
+
    doit = prog_entry(prog);
    doit(prog_entry_arg(prog));
 }