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Qemu system shutdown support

PATCH In review Thiemo Seufer 3 participants 4 messages May 15, 2006 – May 16, 2006 MIPS

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Thiemo Seufer

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#0 lore raw

PATCH 1/1 Qemu system shutdown support

Support for qemu system shutdown.

Signed-off-by Thiemo Seufer <[email protected]>
arch/mips/qemu/Makefile +1 -1
diff -urpN linux-orig/arch/mips/qemu/Makefile linux-work/arch/mips/qemu/Makefile
@@ -2,7 +2,7 @@
 # Makefile for Qemu specific kernel interface routines under Linux.
 #
 
-obj-y		= q-firmware.o q-irq.o q-mem.o q-setup.o
+obj-y		= q-firmware.o q-irq.o q-mem.o q-setup.o q-reset.o
 
 obj-$(CONFIG_VT) += q-vga.o
 obj-$(CONFIG_SMP) += q-smp.o
arch/mips/qemu/q-reset.c +34 -0
diff -urpN linux-orig/arch/mips/qemu/q-reset.c linux-work/arch/mips/qemu/q-reset.c
@@ -0,0 +1,34 @@
+#include <linux/config.h>
+
+#include <asm/io.h>
+#include <asm/reboot.h>
+#include <asm/cacheflush.h>
+#include <asm/qemu.h>
+
+static void qemu_machine_restart(char *command)
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_RESTART_REG;
+
+	set_c0_status(ST0_BEV | ST0_ERL);
+	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+	flush_cache_all();
+	write_c0_wired(0);
+	*reg = 42;
+	while (1)
+		cpu_wait();
+}
+
+static void qemu_machine_halt(void)
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_HALT_REG;
+
+	*reg = 42;
+	while (1)
+		cpu_wait();
+}
+
+void qemu_reboot_setup(void)
+{
+	_machine_restart = qemu_machine_restart;
+	_machine_halt = qemu_machine_halt;
+}
arch/mips/qemu/q-setup.c +3 -0
diff -urpN linux-orig/arch/mips/qemu/q-setup.c linux-work/arch/mips/qemu/q-setup.c
@@ -3,6 +3,7 @@
 #include <asm/time.h>
 
 extern void qvga_init(void);
+extern void qemu_reboot_setup(void);
 
 #define QEMU_PORT_BASE 0xb4000000
 

@@ -27,4 +28,6 @@ void __init plat_setup(void)
 	qvga_init();
 #endif
 	board_timer_setup = qemu_timer_setup;
+
+	qemu_reboot_setup();
 }
include/asm-mips/qemu.h +6 -0
diff -urpN linux-orig/include/asm-mips/qemu.h linux-work/include/asm-mips/qemu.h
@@ -21,4 +21,10 @@
  */
 #define QEMU_C0_COUNTER_CLOCK	100000000
 
+/*
+ * Magic qemu system control location.
+ */
+#define QEMU_RESTART_REG	0xBFBF0000
+#define QEMU_HALT_REG		0xBFBF0004
+
 #endif /* __ASM_QEMU_H */
#1 lore raw

arch/mips/qemu/q-reset.c line 10

Quoted 2 lines · Thiemo Seufer
arch/mips/qemu/q-reset.c +2 -0
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_RESTART_REG;

This should be a tab.

Signature · 2 lines
Martin Michlmayr
http://www.cyrius.com/
author
#2 lore raw
Quoted 5 lines · Martin Michlmayr

Review

Quoted 2 lines · Thiemo Seufer
(quoted diff) +2 -0
+{
+        volatile unsigned int *reg = (unsigned int *)QEMU_RESTART_REG;

This should be a tab.

Updated.

Support for qemu system shutdown.

Signed-off-by Thiemo Seufer <[email protected]>
arch/mips/qemu/Makefile +1 -1
diff -urpN linux-orig/arch/mips/qemu/Makefile linux-work/arch/mips/qemu/Makefile
@@ -2,7 +2,7 @@
 # Makefile for Qemu specific kernel interface routines under Linux.
 #
 
-obj-y		= q-firmware.o q-irq.o q-mem.o q-setup.o
+obj-y		= q-firmware.o q-irq.o q-mem.o q-setup.o q-reset.o
 
 obj-$(CONFIG_VT) += q-vga.o
 obj-$(CONFIG_SMP) += q-smp.o
arch/mips/qemu/q-reset.c +34 -0
diff -urpN linux-orig/arch/mips/qemu/q-reset.c linux-work/arch/mips/qemu/q-reset.c
@@ -0,0 +1,34 @@
+#include <linux/config.h>
+
+#include <asm/io.h>
+#include <asm/reboot.h>
+#include <asm/cacheflush.h>
+#include <asm/qemu.h>
+
+static void qemu_machine_restart(char *command)
+{
+	volatile unsigned int *reg = (unsigned int *)QEMU_RESTART_REG;
+
+	set_c0_status(ST0_BEV | ST0_ERL);
+	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+	flush_cache_all();
+	write_c0_wired(0);
+	*reg = 42;
+	while (1)
+		cpu_wait();
+}
+
+static void qemu_machine_halt(void)
+{
+	volatile unsigned int *reg = (unsigned int *)QEMU_HALT_REG;
+
+	*reg = 42;
+	while (1)
+		cpu_wait();
+}
+
+void qemu_reboot_setup(void)
+{
+	_machine_restart = qemu_machine_restart;
+	_machine_halt = qemu_machine_halt;
+}
arch/mips/qemu/q-setup.c +3 -0
diff -urpN linux-orig/arch/mips/qemu/q-setup.c linux-work/arch/mips/qemu/q-setup.c
@@ -3,6 +3,7 @@
 #include <asm/time.h>
 
 extern void qvga_init(void);
+extern void qemu_reboot_setup(void);
 
 #define QEMU_PORT_BASE 0xb4000000
 

@@ -27,4 +28,6 @@ void __init plat_setup(void)
 	qvga_init();
 #endif
 	board_timer_setup = qemu_timer_setup;
+
+	qemu_reboot_setup();
 }
include/asm-mips/qemu.h +6 -0
diff -urpN linux-orig/include/asm-mips/qemu.h linux-work/include/asm-mips/qemu.h
@@ -21,4 +21,10 @@
  */
 #define QEMU_C0_COUNTER_CLOCK	100000000
 
+/*
+ * Magic qemu system control location.
+ */
+#define QEMU_RESTART_REG	0xBFBF0000
+#define QEMU_HALT_REG		0xBFBF0004
+
 #endif /* __ASM_QEMU_H */