[Skiboot] [PATCH 1/3] core: Add support for cec_power_down() on mambo

[Michael Ellerman]

Currently when running on mambo OPAL_CEC_POWER_DOWN doesn't work, the
simulator keeps running.

We can use the magic mambo support instruction with the right opcode to
ask mambo to stop the simulation.

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 asm/misc.S         |  5 +++++
 core/platform.c    | 14 ++++++++++++--
 include/platform.h |  2 ++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/asm/misc.S b/asm/misc.S
index bbabebc3a803..5e47c9828205 100644
--- a/asm/misc.S
+++ b/asm/misc.S
@@ -69,3 +69,8 @@ mambo_write:
 	.long	0x000eaeb0
 	blr
 
+.global mambo_sim_exit
+mambo_sim_exit:
+	li	%r3, 31	/* aka. SimExitCode */
+	.long	0x000eaeb0
+	b	.
diff --git a/core/platform.c b/core/platform.c
index f93b141860cb..541fc6c186af 100644
--- a/core/platform.c
+++ b/core/platform.c
@@ -21,6 +21,7 @@
 #include <console.h>
 #include <timebase.h>
 #include <cpu.h>
+#include <chip.h>
 
 struct platform	platform;
 
@@ -59,9 +60,18 @@ static void generic_platform_init(void)
 	fake_rtc_init();
 }
 
+static int64_t generic_cec_power_down(uint64_t request __unused)
+{
+	if (chip_quirk(QUIRK_MAMBO_CALLOUTS))
+		mambo_sim_exit();
+
+	return OPAL_UNSUPPORTED;
+}
+
 static struct platform generic_platform = {
-	.name	= "generic",
-	.init	= generic_platform_init,
+	.name		= "generic",
+	.init		= generic_platform_init,
+	.cec_power_down	= generic_cec_power_down,
 };
 
 void probe_platform(void)
diff --git a/include/platform.h b/include/platform.h
index be5999ba344f..80aa8babbe43 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -177,4 +177,6 @@ extern int resource_loaded(enum resource_id id, uint32_t idx);
 
 extern int wait_for_resource_loaded(enum resource_id id, uint32_t idx);
 
+extern void mambo_sim_exit(void);
+
 #endif /* __PLATFORM_H */
-- 
2.1.0