[Minios-devel] [UNIKRAFT PATCHv6 29/37] plat/x86: Implement system_off for x86

[Wei Chen <wei.chen@xxxxxxx>]

Implement system_off for x86 can make shutdown.c become
architecture independent.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
 plat/common/include/x86/cpu.h |  1 +
 plat/common/x86/cpu_native.c  | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/plat/common/include/x86/cpu.h b/plat/common/include/x86/cpu.h
index 104f53e..04d8731 100644
--- a/plat/common/include/x86/cpu.h
+++ b/plat/common/include/x86/cpu.h
@@ -31,6 +31,7 @@
 
 
 void halt(void);
+void system_off(void);
 
 static inline void cpuid(__u32 leaf, __u32 *eax, __u32 *ebx,
                __u32 *ecx, __u32 *edx)
diff --git a/plat/common/x86/cpu_native.c b/plat/common/x86/cpu_native.c
index 0330a20..57ea3a2 100644
--- a/plat/common/x86/cpu_native.c
+++ b/plat/common/x86/cpu_native.c
@@ -47,3 +47,14 @@ unsigned long read_cr2(void)
 
        return cr2;
 }
+
+void system_off(void)
+{
+       /*
+        * Poke the QEMU "isa-debug-exit" device to "shutdown". Should be
+        * harmless if it is not present. This is used to enable automated
+        * tests on virtio.  Note that the actual QEMU exit() status will
+        * be 83 ('S', 41 << 1 | 1).
+        */
+       outw(0x501, 41);
+}
-- 
2.17.1


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