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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@vivier.eu>
Link: https://lore.kernel.org/r/20220406201523.243733-5-laurent@vivier.eu
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Laurent Vivier 2022-04-06 22:15:23 +02:00 committed by Geert Uytterhoeven
parent c92e7ef164
commit 05d51e42df
19 changed files with 595 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/m68k/Kbuild
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@ -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/

17
arch/m68k/Kconfig.machine
View File

@ -149,6 +149,23 @@ 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 GENERIC_CLOCKEVENTS
select GOLDFISH
select GOLDFISH_TIMER
select GOLDFISH_TTY
select M68040
select MMU_MOTOROLA if MMU
select RTC_CLASS
select RTC_DRV_GOLDFISH
select TTY
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

68
arch/m68k/configs/virt_defconfig Normal file
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@ -0,0 +1,68 @@
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_SOUND=y
CONFIG_SND=y
CONFIG_SND_VIRTIO=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

2
arch/m68k/include/asm/config.h
View File

@ -17,6 +17,7 @@ extern int mac_parse_bootinfo(const struct bi_record *record);
extern int mvme147_parse_bootinfo(const struct bi_record *record);
extern int mvme16x_parse_bootinfo(const struct bi_record *record);
extern int q40_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_apollo(void);
@ -29,5 +30,6 @@ extern void config_mvme16x(void);
extern void config_q40(void);
extern void config_sun3(void);
extern void config_sun3x(void);
extern void config_virt(void);
#endif /* _M68K_CONFIG_H */

3
arch/m68k/include/asm/io.h
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@ -8,6 +8,9 @@
#include <asm/io_mm.h>
#endif
#define gf_ioread32 ioread32be
#define gf_iowrite32 iowrite32be
#include <asm-generic/io.h>
#endif /* _M68K_IO_H */

3
arch/m68k/include/asm/irq.h
View File

@ -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

7
arch/m68k/include/asm/pgtable_mm.h
View File

@ -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

44
arch/m68k/include/asm/setup.h
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@ -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

25
arch/m68k/include/asm/virt.h Normal file
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@ -0,0 +1,25 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VIRT_H
#define __ASM_VIRT_H
#define NUM_VIRT_SOURCES 200
struct virt_booter_device_data {
u32 mmio;
u32 irq;
};
struct virt_booter_data {
u32 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);
#endif

18
arch/m68k/include/uapi/asm/bootinfo-virt.h Normal file
View File

@ -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 */

1
arch/m68k/include/uapi/asm/bootinfo.h
View File

@ -83,6 +83,7 @@ struct mem_info {
#define MACH_SUN3X 11
#define MACH_M54XX 12
#define MACH_M5441X 13
#define MACH_VIRT 14
/*

1
arch/m68k/kernel/Makefile
View File

@ -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

31
arch/m68k/kernel/head.S
View File

@ -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
movel %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 */

7
arch/m68k/kernel/setup_mm.c
View File

@ -181,6 +181,8 @@ 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;
}
@ -311,6 +313,11 @@ 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");

21
arch/m68k/mm/kmap.c
View File

@ -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;
@ -293,17 +299,20 @@ 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 (MACH_IS_AMIGA &&
((unsigned long)addr >= 0x40000000) &&
((unsigned long)addr < 0x60000000))
return;
#endif
#ifdef 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);

6
arch/m68k/virt/Makefile Normal file
View File

@ -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

130
arch/m68k/virt/config.c Normal file
View File

@ -0,0 +1,130 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/serial_core.h>
#include <clocksource/timer-goldfish.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;
#define VIRT_CTRL_REG_FEATURES 0x00
#define VIRT_CTRL_REG_CMD 0x04
static struct resource ctrlres;
enum {
CMD_NOOP,
CMD_RESET,
CMD_HALT,
CMD_PANIC,
};
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)
{
void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
iowrite32be(CMD_HALT, base + VIRT_CTRL_REG_CMD);
local_irq_disable();
while (1)
;
}
static void virt_reset(void)
{
void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
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;
}
static void __init virt_sched_init(void)
{
goldfish_timer_init(virt_bi_data.rtc.irq,
(void __iomem *)virt_bi_data.rtc.mmio);
}
void __init config_virt(void)
{
char earlycon[24];
snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08x",
virt_bi_data.tty.mmio);
setup_earlycon(earlycon);
ctrlres = (struct resource)
DEFINE_RES_MEM_NAMED(virt_bi_data.ctrl.mmio, 0x100,
"virtctrl");
if (request_resource(&iomem_resource, &ctrlres)) {
pr_err("Cannot allocate virt controller resource\n");
return;
}
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;
}

155
arch/m68k/virt/ints.c Normal file
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@ -0,0 +1,155 @@
// 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 <linux/ioport.h>
#include <asm/hwtest.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/virt.h>
#define GFPIC_REG_IRQ_PENDING 0x04
#define GFPIC_REG_IRQ_DISABLE_ALL 0x08
#define GFPIC_REG_IRQ_DISABLE 0x0c
#define GFPIC_REG_IRQ_ENABLE 0x10
extern void show_registers(struct pt_regs *regs);
static struct resource picres[6];
static const char *picname[6] = {
"goldfish_pic.0",
"goldfish_pic.1",
"goldfish_pic.2",
"goldfish_pic.3",
"goldfish_pic.4",
"goldfish_pic.5"
};
/*
* 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-timer
* IRQ #2 -> goldfish-rtc
* IRQ #3 to IRQ #32 -> unused
* CPU IRQ #7 -> NMI
*/
static u32 gfpic_read(int pic, int reg)
{
void __iomem *base = (void __iomem *)(virt_bi_data.pic.mmio +
pic * 0x1000);
return ioread32be(base + reg);
}
static void gfpic_write(u32 value, int pic, int reg)
{
void __iomem *base = (void __iomem *)(virt_bi_data.pic.mmio +
pic * 0x1000);
iowrite32be(value, base + reg);
}
#define GF_PIC(irq) ((irq - IRQ_USER) / 32)
#define GF_IRQ(irq) ((irq - IRQ_USER) % 32)
static void virt_irq_enable(struct irq_data *data)
{
gfpic_write(BIT(GF_IRQ(data->irq)), GF_PIC(data->irq),
GFPIC_REG_IRQ_ENABLE);
}
static void virt_irq_disable(struct irq_data *data)
{
gfpic_write(BIT(GF_IRQ(data->irq)), GF_PIC(data->irq),
GFPIC_REG_IRQ_DISABLE);
}
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 int in_nmi;
if (READ_ONCE(in_nmi))
return IRQ_HANDLED;
WRITE_ONCE(in_nmi, 1);
pr_warn("Non-Maskable Interrupt\n");
show_registers(get_irq_regs());
WRITE_ONCE(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;
unsigned int irq_num;
unsigned int pic = desc->irq_data.irq - 1;
irq_pending = gfpic_read(pic, GFPIC_REG_IRQ_PENDING);
irq_num = IRQ_USER + pic * 32;
do {
if (irq_pending & 1)
generic_handle_irq(irq_num);
++irq_num;
irq_pending >>= 1;
} while (irq_pending);
}
void __init virt_init_IRQ(void)
{
unsigned 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++) {
picres[i] = (struct resource)
DEFINE_RES_MEM_NAMED(virt_bi_data.pic.mmio + i * 0x1000,
0x1000, picname[i]);
if (request_resource(&iomem_resource, &picres[i])) {
pr_err("Cannot allocate %s resource\n", picname[i]);
return;
}
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");
}

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arch/m68k/virt/platform.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/memblock.h>
#include <asm/virt.h>
#include <asm/irq.h>
#define VIRTIO_BUS_NB 128
static int __init virt_virtio_init(unsigned 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),
};
struct platform_device *pdev;
unsigned 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);