Message-Id: <20220112213901.2178667-3-laurent@vivier.eu>
Date:   Wed, 12 Jan 2022 22:39:00 +0100
From:   Laurent Vivier <laurent@...ier.eu>
To:     linux-kernel@...r.kernel.org
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-rtc@...r.kernel.org, Laurent Vivier <laurent@...ier.eu>
Subject: [PATCH v4 2/3] m68k: introduce a virtual m68k machine

This machine allows to have up to 3.2 GiB and 128 Virtio devices.

It is based on android goldfish devices.

Signed-off-by: Laurent Vivier <laurent@...ier.eu>
---
 arch/m68k/Kbuild                           |   1 +
 arch/m68k/Kconfig.machine                  |  16 +++
 arch/m68k/configs/virt_defconfig           |  65 +++++++++++
 arch/m68k/include/asm/config.h             |   2 +
 arch/m68k/include/asm/irq.h                |   3 +-
 arch/m68k/include/asm/pgtable_mm.h         |   7 ++
 arch/m68k/include/asm/setup.h              |  44 ++++++--
 arch/m68k/include/asm/virt.h               |  26 +++++
 arch/m68k/include/uapi/asm/bootinfo-virt.h |  18 ++++
 arch/m68k/include/uapi/asm/bootinfo.h      |   1 +
 arch/m68k/kernel/Makefile                  |   1 +
 arch/m68k/kernel/head.S                    |  31 ++++++
 arch/m68k/kernel/setup_mm.c                |   7 ++
 arch/m68k/mm/kmap.c                        |  23 ++--
 arch/m68k/virt/Makefile                    |   6 ++
 arch/m68k/virt/config.c                    | 112 +++++++++++++++++++
 arch/m68k/virt/ints.c                      | 120 +++++++++++++++++++++
 arch/m68k/virt/platform.c                  |  72 +++++++++++++
 arch/m68k/virt/timer.c                     |  90 ++++++++++++++++
 19 files changed, 627 insertions(+), 18 deletions(-)
 create mode 100644 arch/m68k/configs/virt_defconfig
 create mode 100644 arch/m68k/include/asm/virt.h
 create mode 100644 arch/m68k/include/uapi/asm/bootinfo-virt.h
 create mode 100644 arch/m68k/virt/Makefile
 create mode 100644 arch/m68k/virt/config.c
 create mode 100644 arch/m68k/virt/ints.c
 create mode 100644 arch/m68k/virt/platform.c
 create mode 100644 arch/m68k/virt/timer.c

diff --git a/arch/m68k/Kbuild b/arch/m68k/Kbuild
index 18abb35c26a1..7762af9f6def 100644
--- a/arch/m68k/Kbuild
+++ b/arch/m68k/Kbuild
@@ -17,3 +17,4 @@ obj-$(CONFIG_M68060)		+= ifpsp060/
 obj-$(CONFIG_M68KFPU_EMU)	+= math-emu/
 obj-$(CONFIG_M68000)		+= 68000/
 obj-$(CONFIG_COLDFIRE)		+= coldfire/
+obj-$(CONFIG_VIRT)		+= virt/
diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
index eeab4f3e6c19..769c5b38fe16 100644
--- a/arch/m68k/Kconfig.machine
+++ b/arch/m68k/Kconfig.machine
@@ -149,6 +149,22 @@ config SUN3
 
 	  If you don't want to compile a kernel exclusively for a Sun 3, say N.
 
+config VIRT
+	bool "Virtual M68k Machine support"
+	depends on MMU
+	select LEGACY_TIMER_TICK
+	select M68040
+	select MMU_MOTOROLA if MMU
+	select GOLDFISH
+	select GOLDFISH_TTY
+	select TTY
+	select RTC_CLASS
+	select RTC_DRV_GOLDFISH
+	select VIRTIO_MMIO
+	help
+	  This options enable a pure virtual machine based on m68k,
+	  VIRTIO MMIO devices and GOLDFISH interfaces (TTY, RTC, PIC)
+
 config PILOT
 	bool
 
diff --git a/arch/m68k/configs/virt_defconfig b/arch/m68k/configs/virt_defconfig
new file mode 100644
index 000000000000..462e51ef69eb
--- /dev/null
+++ b/arch/m68k/configs/virt_defconfig
@@ -0,0 +1,65 @@
+CONFIG_LOCALVERSION="-virt"
+CONFIG_SYSVIPC=y
+CONFIG_CGROUPS=y
+CONFIG_BLK_CGROUP=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_CGROUP_PIDS=y
+CONFIG_CGROUP_RDMA=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_VIRT=y
+CONFIG_PROC_HARDWARE=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_AMIGA_PARTITION=y
+CONFIG_ATARI_PARTITION=y
+CONFIG_MAC_PARTITION=y
+CONFIG_BSD_DISKLABEL=y
+CONFIG_MINIX_SUBPARTITION=y
+CONFIG_SOLARIS_X86_PARTITION=y
+CONFIG_UNIXWARE_DISKLABEL=y
+CONFIG_LDM_PARTITION=y
+CONFIG_LDM_DEBUG=y
+CONFIG_SUN_PARTITION=y
+CONFIG_SYSV68_PARTITION=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_CGROUP_NET_PRIO=y
+CONFIG_CGROUP_NET_CLASSID=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
+CONFIG_DEVTMPFS=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SR=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_HW_RANDOM_VIRTIO=y
+CONFIG_DRM=y
+CONFIG_DRM_VIRTIO_GPU=y
+CONFIG_FB=y
+CONFIG_VIRT_DRIVERS=y
+CONFIG_VIRTIO_INPUT=y
+CONFIG_EXT4_FS=y
+CONFIG_AUTOFS_FS=y
+CONFIG_ISO9660_FS=y
+CONFIG_JOLIET=y
+CONFIG_ZISOFS=y
+CONFIG_UDF_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_9P_FS=y
+CONFIG_9P_FS_POSIX_ACL=y
+CONFIG_9P_FS_SECURITY=y
+CONFIG_EARLY_PRINTK=y
diff --git a/arch/m68k/include/asm/config.h b/arch/m68k/include/asm/config.h
index aae61070628b..b9dacc52f2c8 100644
--- a/arch/m68k/include/asm/config.h
+++ b/arch/m68k/include/asm/config.h
@@ -17,6 +17,7 @@ extern int mvme16x_parse_bootinfo(const struct bi_record *record);
 extern int mvme147_parse_bootinfo(const struct bi_record *record);
 extern int hp300_parse_bootinfo(const struct bi_record *record);
 extern int apollo_parse_bootinfo(const struct bi_record *record);
+extern int virt_parse_bootinfo(const struct bi_record *record);
 
 extern void config_amiga(void);
 extern void config_atari(void);
@@ -29,5 +30,6 @@ extern void config_bvme6000(void);
 extern void config_hp300(void);
 extern void config_q40(void);
 extern void config_sun3x(void);
+extern void config_virt(void);
 
 #endif /* _M68K_CONFIG_H */
diff --git a/arch/m68k/include/asm/irq.h b/arch/m68k/include/asm/irq.h
index 91dd493791d7..7829e955ca04 100644
--- a/arch/m68k/include/asm/irq.h
+++ b/arch/m68k/include/asm/irq.h
@@ -12,7 +12,8 @@
  */
 #if defined(CONFIG_COLDFIRE)
 #define NR_IRQS 256
-#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
+#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || \
+      defined(CONFIG_SUN3X) || defined(CONFIG_VIRT)
 #define NR_IRQS 200
 #elif defined(CONFIG_ATARI)
 #define NR_IRQS 141
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index 143ba7de9bda..9b4e2fe2ac82 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -80,6 +80,9 @@
 #elif defined(CONFIG_COLDFIRE)
 #define KMAP_START	0xe0000000
 #define KMAP_END	0xf0000000
+#elif defined(CONFIG_VIRT)
+#define	KMAP_START	0xdf000000
+#define	KMAP_END	0xff000000
 #else
 #define	KMAP_START	0xd0000000
 #define	KMAP_END	0xf0000000
@@ -92,6 +95,10 @@ extern unsigned long m68k_vmalloc_end;
 #elif defined(CONFIG_COLDFIRE)
 #define VMALLOC_START	0xd0000000
 #define VMALLOC_END	0xe0000000
+#elif defined(CONFIG_VIRT)
+#define VMALLOC_OFFSET	PAGE_SIZE
+#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_END     KMAP_START
 #else
 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 8MB value just means that there will be a 8MB "hole" after the
diff --git a/arch/m68k/include/asm/setup.h b/arch/m68k/include/asm/setup.h
index 8f2023f8c1c4..2c99477aaf89 100644
--- a/arch/m68k/include/asm/setup.h
+++ b/arch/m68k/include/asm/setup.h
@@ -37,7 +37,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_ATARI) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                      \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                  \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_AMIGA (m68k_machtype == MACH_AMIGA)
 #else
 #  define MACH_AMIGA_ONLY
@@ -50,7 +51,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                      \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                  \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_ATARI (m68k_machtype == MACH_ATARI)
 #else
 #  define MACH_ATARI_ONLY
@@ -63,7 +65,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_ATARI) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)                 \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                        \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                    \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MAC (m68k_machtype == MACH_MAC)
 #else
 #  define MACH_MAC_ONLY
@@ -84,7 +87,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)              \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_APOLLO (m68k_machtype == MACH_APOLLO)
 #else
 #  define MACH_APOLLO_ONLY
@@ -97,7 +101,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MVME147 (m68k_machtype == MACH_MVME147)
 #else
 #  define MACH_MVME147_ONLY
@@ -110,7 +115,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MVME16x (m68k_machtype == MACH_MVME16x)
 #else
 #  define MACH_MVME16x_ONLY
@@ -123,7 +129,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_BVME6000 (m68k_machtype == MACH_BVME6000)
 #else
 #  define MACH_BVME6000_ONLY
@@ -136,7 +143,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_Q40) \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_HP300 (m68k_machtype == MACH_HP300)
 #else
 #  define MACH_HP300_ONLY
@@ -149,7 +157,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_Q40 (m68k_machtype == MACH_Q40)
 #else
 #  define MACH_Q40_ONLY
@@ -162,7 +171,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
-	|| defined(CONFIG_Q40) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_Q40) || defined(CONFIG_MVME147)                   \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_SUN3X (m68k_machtype == MACH_SUN3X)
 #else
 #  define CONFIG_SUN3X_ONLY
@@ -170,6 +180,20 @@ extern unsigned long m68k_machtype;
 #  define MACH_TYPE (MACH_SUN3X)
 #endif
 
+#if !defined(CONFIG_VIRT)
+#  define MACH_IS_VIRT (0)
+#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
+	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
+	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
+	|| defined(CONFIG_Q40) || defined(CONFIG_SUN3X)                     \
+	|| defined(CONFIG_MVME147)
+#  define MACH_IS_VIRT (m68k_machtype == MACH_VIRT)
+#else
+#  define MACH_VIRT_ONLY
+#  define MACH_IS_VIRT (1)
+#  define MACH_TYPE (MACH_VIRT)
+#endif
+
 #ifndef MACH_TYPE
 #  define MACH_TYPE (m68k_machtype)
 #endif
diff --git a/arch/m68k/include/asm/virt.h b/arch/m68k/include/asm/virt.h
new file mode 100644
index 000000000000..2795a70f709b
--- /dev/null
+++ b/arch/m68k/include/asm/virt.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_VIRT_H
+#define __ASM_VIRT_H
+
+#define NUM_VIRT_SOURCES 200
+
+struct virt_booter_device_data {
+	unsigned long mmio;
+	unsigned long irq;
+};
+
+struct virt_booter_data {
+	unsigned long qemu_version;
+	struct virt_booter_device_data pic;
+	struct virt_booter_device_data rtc;
+	struct virt_booter_device_data tty;
+	struct virt_booter_device_data ctrl;
+	struct virt_booter_device_data virtio;
+};
+
+extern struct virt_booter_data virt_bi_data;
+
+extern void __init virt_init_IRQ(void);
+extern void __init virt_sched_init(void);
+
+#endif
diff --git a/arch/m68k/include/uapi/asm/bootinfo-virt.h b/arch/m68k/include/uapi/asm/bootinfo-virt.h
new file mode 100644
index 000000000000..ab17fd9d200d
--- /dev/null
+++ b/arch/m68k/include/uapi/asm/bootinfo-virt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * asm/bootinfo-virt.h -- Virtual-m68k-specific boot information definitions
+ */
+
+#ifndef _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+#define _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+
+#define BI_VIRT_QEMU_VERSION	0x8000
+#define BI_VIRT_GF_PIC_BASE	0x8001
+#define BI_VIRT_GF_RTC_BASE	0x8002
+#define BI_VIRT_GF_TTY_BASE	0x8003
+#define BI_VIRT_VIRTIO_BASE	0x8004
+#define BI_VIRT_CTRL_BASE       0x8005
+
+#define VIRT_BOOTI_VERSION	MK_BI_VERSION(2, 0)
+
+#endif /* _UAPI_ASM_M68K_BOOTINFO_MAC_H */
diff --git a/arch/m68k/include/uapi/asm/bootinfo.h b/arch/m68k/include/uapi/asm/bootinfo.h
index 38d3140381fa..203d9cbf9630 100644
--- a/arch/m68k/include/uapi/asm/bootinfo.h
+++ b/arch/m68k/include/uapi/asm/bootinfo.h
@@ -83,6 +83,7 @@ struct mem_info {
 #define MACH_SUN3X		11
 #define MACH_M54XX		12
 #define MACH_M5441X		13
+#define MACH_VIRT		14
 
 
     /*
diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile
index dbac7f8743fc..c0833da6a2ca 100644
--- a/arch/m68k/kernel/Makefile
+++ b/arch/m68k/kernel/Makefile
@@ -11,6 +11,7 @@ extra-$(CONFIG_VME)	:= head.o
 extra-$(CONFIG_HP300)	:= head.o
 extra-$(CONFIG_Q40)	:= head.o
 extra-$(CONFIG_SUN3X)	:= head.o
+extra-$(CONFIG_VIRT)	:= head.o
 extra-$(CONFIG_SUN3)	:= sun3-head.o
 extra-y			+= vmlinux.lds
 
diff --git a/arch/m68k/kernel/head.S b/arch/m68k/kernel/head.S
index 493c95db0e51..ca9ccf23de86 100644
--- a/arch/m68k/kernel/head.S
+++ b/arch/m68k/kernel/head.S
@@ -262,6 +262,7 @@
 #include <asm/bootinfo-hp300.h>
 #include <asm/bootinfo-mac.h>
 #include <asm/bootinfo-q40.h>
+#include <asm/bootinfo-virt.h>
 #include <asm/bootinfo-vme.h>
 #include <asm/setup.h>
 #include <asm/entry.h>
@@ -534,6 +535,7 @@ func_define	putn,1
 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
+#define is_not_virt(lab) cmpl &MACH_VIRT,%pc@(m68k_machtype); jne lab
 
 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
 			jeq 42f; \
@@ -647,6 +649,14 @@ ENTRY(__start)
 L(test_notmac):
 #endif /* CONFIG_MAC */
 
+#ifdef CONFIG_VIRT
+	is_not_virt(L(test_notvirt))
+
+	get_bi_record BI_VIRT_GF_TTY_BASE
+	lea	%pc@(L(virt_gf_tty_base)),%a1
+	movel	%a0@,%a1@
+L(test_notvirt):
+#endif /* CONFIG_VIRT */
 
 /*
  * There are ultimately two pieces of information we want for all kinds of
@@ -1237,6 +1247,13 @@ L(mmu_init_not_mac):
 L(notsun3x):
 #endif
 
+#ifdef CONFIG_VIRT
+	is_not_virt(L(novirt))
+	mmu_map_tt	#1,#0xFF000000,#0x01000000,#_PAGE_NOCACHE_S
+	jbra    L(mmu_init_done)
+L(novirt):
+#endif
+
 #ifdef CONFIG_APOLLO
 	is_not_apollo(L(notapollo))
 
@@ -3186,6 +3203,14 @@ func_start	serial_putc,%d0/%d1/%a0/%a1
 3:
 #endif
 
+#ifdef CONFIG_VIRT
+	is_not_virt(1f)
+
+	movel L(virt_gf_tty_base),%a1
+	moveb %d0,%a1@(GF_PUT_CHAR)
+1:
+#endif
+
 L(serial_putc_done):
 func_return	serial_putc
 
@@ -3865,3 +3890,9 @@ q40_mem_cptr:
 L(q40_do_debug):
 	.long	0
 #endif
+
+#if defined(CONFIG_VIRT)
+GF_PUT_CHAR = 0x00
+L(virt_gf_tty_base):
+	.long 0
+#endif /* CONFIG_VIRT */
diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 226dc3750397..b4ece3b05504 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -182,6 +182,8 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record)
 				unknown = hp300_parse_bootinfo(record);
 			else if (MACH_IS_APOLLO)
 				unknown = apollo_parse_bootinfo(record);
+			else if (MACH_IS_VIRT)
+				unknown = virt_parse_bootinfo(record);
 			else
 				unknown = 1;
 		}
@@ -312,6 +314,11 @@ void __init setup_arch(char **cmdline_p)
 		cf_mmu_context_init();
 		config_BSP(NULL, 0);
 		break;
+#endif
+#ifdef CONFIG_VIRT
+	case MACH_VIRT:
+		config_virt();
+		break;
 #endif
 	default:
 		panic("No configuration setup");
diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
index 20ddf71b43d0..39729f40d106 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -179,6 +179,12 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
 			return (void __iomem *)physaddr;
 	}
 #endif
+#ifdef CONFIG_VIRT
+	if (MACH_IS_VIRT) {
+		if (physaddr >= 0xff000000 && cacheflag == IOMAP_NOCACHE_SER)
+			return (void __iomem *)physaddr;
+	}
+#endif
 #ifdef CONFIG_COLDFIRE
 	if (__cf_internalio(physaddr))
 		return (void __iomem *) physaddr;
@@ -292,18 +298,21 @@ EXPORT_SYMBOL(__ioremap);
  */
 void iounmap(void __iomem *addr)
 {
-#ifdef CONFIG_AMIGA
-	if ((!MACH_IS_AMIGA) ||
-	    (((unsigned long)addr < 0x40000000) ||
-	     ((unsigned long)addr > 0x60000000)))
-			free_io_area((__force void *)addr);
-#else
+#if defined(CONFIG_AMIGA)
+	if (MACH_IS_AMIGA &&
+	    ((unsigned long)addr >= 0x40000000) &&
+	    ((unsigned long)addr < 0x60000000))
+		return;
+#endif
+#if defined(CONFIG_VIRT)
+	if (MACH_IS_VIRT && (unsigned long)addr >= 0xff000000)
+		return;
+#endif
 #ifdef CONFIG_COLDFIRE
 	if (cf_internalio(addr))
 		return;
 #endif
 	free_io_area((__force void *)addr);
-#endif
 }
 EXPORT_SYMBOL(iounmap);
 
diff --git a/arch/m68k/virt/Makefile b/arch/m68k/virt/Makefile
new file mode 100644
index 000000000000..40420fc886bb
--- /dev/null
+++ b/arch/m68k/virt/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Linux arch/m68k/virt source directory
+#
+
+obj-y		:= config.o ints.o platform.o timer.o
diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c
new file mode 100644
index 000000000000..3b1ac40c77bc
--- /dev/null
+++ b/arch/m68k/virt/config.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/serial_core.h>
+
+#include <asm/bootinfo.h>
+#include <asm/bootinfo-virt.h>
+#include <asm/byteorder.h>
+#include <asm/machdep.h>
+#include <asm/virt.h>
+#include <asm/config.h>
+
+struct virt_booter_data virt_bi_data;
+
+struct virt_ctrl {
+	u32 features;
+	u32 cmd;
+};
+
+enum {
+	CMD_NOOP,
+	CMD_RESET,
+	CMD_HALT,
+	CMD_PANIC,
+};
+
+#define virt_ctrl ((volatile struct virt_ctrl *)virt_bi_data.ctrl.mmio)
+
+static void virt_get_model(char *str)
+{
+	/* str is 80 characters long */
+	sprintf(str, "QEMU Virtual M68K Machine (%u.%u.%u)",
+		(u8)(virt_bi_data.qemu_version >> 24),
+		(u8)(virt_bi_data.qemu_version >> 16),
+		(u8)(virt_bi_data.qemu_version >> 8));
+}
+
+static void virt_halt(void)
+{
+	virt_ctrl->cmd = CMD_HALT;
+	local_irq_disable();
+	while (1)
+		;
+}
+
+static void virt_reset(void)
+{
+	virt_ctrl->cmd = CMD_RESET;
+	local_irq_disable();
+	while (1)
+		;
+}
+
+/*
+ * Parse a virtual-m68k-specific record in the bootinfo
+ */
+
+int __init virt_parse_bootinfo(const struct bi_record *record)
+{
+	int unknown = 0;
+	const void *data = record->data;
+
+	switch (be16_to_cpu(record->tag)) {
+	case BI_VIRT_QEMU_VERSION:
+		virt_bi_data.qemu_version = be32_to_cpup(data);
+		break;
+	case BI_VIRT_GF_PIC_BASE:
+		virt_bi_data.pic.mmio = be32_to_cpup(data);
+		data += 4;
+		virt_bi_data.pic.irq = be32_to_cpup(data);
+		break;
+	case BI_VIRT_GF_RTC_BASE:
+		virt_bi_data.rtc.mmio = be32_to_cpup(data);
+		data += 4;
+		virt_bi_data.rtc.irq = be32_to_cpup(data);
+		break;
+	case BI_VIRT_GF_TTY_BASE:
+		virt_bi_data.tty.mmio = be32_to_cpup(data);
+		data += 4;
+		virt_bi_data.tty.irq = be32_to_cpup(data);
+		break;
+	case BI_VIRT_CTRL_BASE:
+		virt_bi_data.ctrl.mmio = be32_to_cpup(data);
+		data += 4;
+		virt_bi_data.ctrl.irq = be32_to_cpup(data);
+		break;
+	case BI_VIRT_VIRTIO_BASE:
+		virt_bi_data.virtio.mmio = be32_to_cpup(data);
+		data += 4;
+		virt_bi_data.virtio.irq = be32_to_cpup(data);
+		break;
+	default:
+		unknown = 1;
+		break;
+	}
+	return unknown;
+}
+
+void __init config_virt(void)
+{
+	char earlycon[24];
+
+	snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08lx",
+		 virt_bi_data.tty.mmio);
+	setup_earlycon(earlycon);
+
+	mach_init_IRQ = virt_init_IRQ;
+	mach_sched_init = virt_sched_init;
+	mach_get_model = virt_get_model;
+	mach_reset = virt_reset;
+	mach_halt = virt_halt;
+	mach_power_off = virt_halt;
+}
diff --git a/arch/m68k/virt/ints.c b/arch/m68k/virt/ints.c
new file mode 100644
index 000000000000..7b2827f84b09
--- /dev/null
+++ b/arch/m68k/virt/ints.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/types.h>
+
+#include <asm/hwtest.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/virt.h>
+
+struct goldfish_pic {
+	u32 status;
+	u32 irq_pending;
+	u32 irq_diable_all;
+	u32 disable;
+	u32 enable;
+	u32 pad[1019];
+};
+
+extern void show_registers(struct pt_regs *);
+
+#define gf_pic ((volatile struct goldfish_pic *)virt_bi_data.pic.mmio)
+
+#define GF_PIC(irq) (gf_pic[(irq - IRQ_USER) / 32])
+#define GF_IRQ(irq) ((irq - IRQ_USER) % 32)
+
+static void virt_irq_enable(struct irq_data *data)
+{
+	GF_PIC(data->irq).enable = 1 << GF_IRQ(data->irq);
+}
+
+static void virt_irq_disable(struct irq_data *data)
+{
+	GF_PIC(data->irq).disable = 1 << GF_IRQ(data->irq);
+}
+
+static unsigned int virt_irq_startup(struct irq_data *data)
+{
+	virt_irq_enable(data);
+	return 0;
+}
+
+static irqreturn_t virt_nmi_handler(int irq, void *dev_id)
+{
+	static volatile int in_nmi;
+
+	if (in_nmi)
+		return IRQ_HANDLED;
+	in_nmi = 1;
+
+	pr_warn("Non-Maskable Interrupt\n");
+	show_registers(get_irq_regs());
+
+	in_nmi = 0;
+	return IRQ_HANDLED;
+}
+
+static struct irq_chip virt_irq_chip = {
+	.name		= "virt",
+	.irq_enable	= virt_irq_enable,
+	.irq_disable	= virt_irq_disable,
+	.irq_startup	= virt_irq_startup,
+	.irq_shutdown	= virt_irq_disable,
+};
+
+static void goldfish_pic_irq(struct irq_desc *desc)
+{
+	u32 irq_pending;
+	int irq_num;
+
+	irq_pending = gf_pic[desc->irq_data.irq - 1].irq_pending;
+	irq_num = IRQ_USER + (desc->irq_data.irq - 1) * 32;
+
+	do {
+		if (irq_pending & 1)
+			generic_handle_irq(irq_num);
+		++irq_num;
+		irq_pending >>= 1;
+	} while (irq_pending);
+}
+
+/*
+ * 6 goldfish-pic for CPU IRQ #1 to IRQ #6
+ * CPU IRQ #1 -> PIC #1
+ *               IRQ #1 to IRQ #31 -> unused
+ *               IRQ #32 -> goldfish-tty
+ * CPU IRQ #2 -> PIC #2
+ *               IRQ #1 to IRQ #32 -> virtio-mmio from 1 to 32
+ * CPU IRQ #3 -> PIC #3
+ *               IRQ #1 to IRQ #32 -> virtio-mmio from 33 to 64
+ * CPU IRQ #4 -> PIC #4
+ *               IRQ #1 to IRQ #32 -> virtio-mmio from 65 to 96
+ * CPU IRQ #5 -> PIC #5
+ *               IRQ #1 to IRQ #32 -> virtio-mmio from 97 to 128
+ * CPU IRQ #6 -> PIC #6
+ *               IRQ #1 -> goldfish-rtc
+ *               IRQ #2 to IRQ #32 -> unused
+ * CPU IRQ #7 -> NMI
+ */
+void __init virt_init_IRQ(void)
+{
+	int i;
+
+	m68k_setup_irq_controller(&virt_irq_chip, handle_simple_irq, IRQ_USER,
+				  NUM_VIRT_SOURCES - IRQ_USER);
+
+	for (i = 0; i < 6; i++) {
+		irq_set_chained_handler(virt_bi_data.pic.irq + i,
+					goldfish_pic_irq);
+	}
+
+	if (request_irq(IRQ_AUTO_7, virt_nmi_handler, 0, "NMI",
+			virt_nmi_handler))
+		pr_err("Couldn't register NMI\n");
+}
diff --git a/arch/m68k/virt/platform.c b/arch/m68k/virt/platform.c
new file mode 100644
index 000000000000..c16158e7a9ca
--- /dev/null
+++ b/arch/m68k/virt/platform.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <asm/virt.h>
+#include <asm/irq.h>
+
+#define VIRTIO_BUS_NB	128
+
+static int __init virt_virtio_init(int id)
+{
+	const struct resource res[] = {
+		DEFINE_RES_MEM(virt_bi_data.virtio.mmio + id * 0x200, 0x200),
+		DEFINE_RES_IRQ(virt_bi_data.virtio.irq + id),
+	};
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_simple("virtio-mmio", id,
+					       res, ARRAY_SIZE(res));
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	return 0;
+}
+
+static int __init virt_platform_init(void)
+{
+	const struct resource goldfish_tty_res[] = {
+		DEFINE_RES_MEM(virt_bi_data.tty.mmio, 1),
+		DEFINE_RES_IRQ(virt_bi_data.tty.irq),
+	};
+	/* this is the second gf-rtc, the first one is used by the scheduler */
+	const struct resource goldfish_rtc_res[] = {
+		DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
+		DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
+	};
+	extern unsigned long min_low_pfn;
+	struct platform_device *pdev;
+	int i;
+
+	if (!MACH_IS_VIRT)
+		return -ENODEV;
+
+	/* We need this to have DMA'able memory provided to goldfish-tty */
+	min_low_pfn = 0;
+
+	pdev = platform_device_register_simple("goldfish_tty",
+					       PLATFORM_DEVID_NONE,
+					       goldfish_tty_res,
+					       ARRAY_SIZE(goldfish_tty_res));
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	pdev = platform_device_register_simple("goldfish_rtc",
+					       PLATFORM_DEVID_NONE,
+					       goldfish_rtc_res,
+					       ARRAY_SIZE(goldfish_rtc_res));
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	for (i = 0; i < VIRTIO_BUS_NB; i++) {
+		int err;
+
+		err = virt_virtio_init(i);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+arch_initcall(virt_platform_init);
diff --git a/arch/m68k/virt/timer.c b/arch/m68k/virt/timer.c
new file mode 100644
index 000000000000..843bf6ed7e1a
--- /dev/null
+++ b/arch/m68k/virt/timer.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/clocksource.h>
+#include <asm/virt.h>
+
+struct goldfish_timer {
+	u32 time_low;
+	u32 time_high;
+	u32 alarm_low;
+	u32 alarm_high;
+	u32 irq_enabled;
+	u32 clear_alarm;
+	u32 alarm_status;
+	u32 clear_interrupt;
+};
+
+#define gf_timer ((volatile struct goldfish_timer *)virt_bi_data.rtc.mmio)
+
+static u64 goldfish_timer_read(struct clocksource *cs)
+{
+	u64 ticks;
+
+	/*
+	 * time_low: get low bits of current time and update time_high
+	 * time_high: get high bits of time at last time_low read
+	 */
+	ticks = gf_timer->time_low;
+	ticks += (u64)gf_timer->time_high << 32;
+
+	return ticks;
+}
+
+static struct clocksource goldfish_timer = {
+	.name		= "goldfish_timer",
+	.rating		= 400,
+	.read		= goldfish_timer_read,
+	.mask		= CLOCKSOURCE_MASK(64),
+	.flags		= 0,
+	.max_idle_ns	= LONG_MAX,
+};
+
+static irqreturn_t golfish_timer_handler(int irq, void *dev_id)
+{
+	u64 now;
+
+	gf_timer->clear_interrupt = 1;
+
+	now = goldfish_timer_read(NULL);
+
+	legacy_timer_tick(1);
+
+	now += NSEC_PER_SEC / HZ;
+	gf_timer->alarm_high = upper_32_bits(now);
+	gf_timer->alarm_low = lower_32_bits(now);
+
+	return IRQ_HANDLED;
+}
+
+void __init virt_sched_init(void)
+{
+	static struct resource sched_res;
+	u64 now;
+
+	sched_res.name  = "goldfish_timer";
+	sched_res.start = virt_bi_data.rtc.mmio;
+	sched_res.end   = virt_bi_data.rtc.mmio + 0xfff;
+
+	if (request_resource(&iomem_resource, &sched_res)) {
+		pr_err("Cannot allocate goldfish-timer resource\n");
+		return;
+	}
+
+	if (request_irq(virt_bi_data.rtc.irq, golfish_timer_handler, IRQF_TIMER,
+			"timer", NULL)) {
+		pr_err("Couldn't register timer interrupt\n");
+		return;
+	}
+
+	now = goldfish_timer_read(NULL);
+	now += NSEC_PER_SEC / HZ;
+
+	gf_timer->clear_interrupt = 1;
+	gf_timer->alarm_high = upper_32_bits(now);
+	gf_timer->alarm_low = lower_32_bits(now);
+	gf_timer->irq_enabled = 1;
+
+	clocksource_register_hz(&goldfish_timer, NSEC_PER_SEC);
+}
-- 
2.34.1

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