From: Nadav Har'El <n...@scylladb.com>
Committer: GitHub <nore...@github.com>
Branch: master
Merge pull request #842 from sa-kib/aarch64-xen-v2
[RFC][V2] aarch64: basic Xen support
Reviewed-by: Nadav Har'El <n...@scylladb.com>
---
diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -338,7 +338,7 @@ CFLAGS = -std=gnu99 $(COMMON)
CFLAGS += -I libc/stdio -I libc/internal -I libc/arch/$(arch) \
-Wno-missing-braces -Wno-parentheses -Wno-unused-but-set-variable
-ASFLAGS = -g $(autodepend) -DASSEMBLY
+ASFLAGS = -g $(autodepend) -D__ASSEMBLY__
$(out)/fs/vfs/main.o: CXXFLAGS += -Wno-sign-compare -Wno-write-strings
@@ -822,6 +822,7 @@ endif # x64
ifeq ($(arch),aarch64)
drivers += drivers/pl011.o
+drivers += drivers/xenconsole.o
drivers += drivers/virtio.o
drivers += drivers/virtio-vring.o
drivers += drivers/virtio-rng.o
@@ -850,6 +851,7 @@ objects += arch/$(arch)/pci.o
objects += arch/$(arch)/msi.o
objects += arch/$(arch)/power.o
objects += arch/$(arch)/feexcept.o
+objects += arch/$(arch)/xen.o
$(out)/arch/x64/string-ssse3.o: CXXFLAGS += -mssse3
@@ -858,6 +860,7 @@ objects += arch/$(arch)/psci.o
objects += arch/$(arch)/arm-clock.o
objects += arch/$(arch)/gic.o
objects += arch/$(arch)/arch-dtb.o
+objects += arch/$(arch)/hypercall.o
objects += $(libfdt)
endif
@@ -869,7 +872,6 @@ objects += arch/x64/ioapic.o
objects += arch/x64/apic.o
objects += arch/x64/apic-clock.o
objects += arch/x64/entry-xen.o
-objects += arch/x64/xen.o
objects += arch/x64/xen_intr.o
objects += core/sampler.o
objects += $(acpi)
diff --git a/arch/aarch64/arch-dtb.cc b/arch/aarch64/arch-dtb.cc
--- a/arch/aarch64/arch-dtb.cc
+++ b/arch/aarch64/arch-dtb.cc
@@ -362,7 +362,6 @@ static int dtb_get_pci_node()
goto out;
}
- abort("dtb_get_pci_node: no CAM or ECAM node found.\n");
out:
return dtb_pci_node;
}
@@ -570,3 +569,11 @@ bool dtb_get_pci_irqmap(u32 *bdfs, int *irq_ids, int n)
}
return true;
}
+
+bool dtb_get_vmm_is_xen()
+{
+ if (fdt_check_header(dtb) != 0)
+ return false; /* broken header will be handled later */
+
+ return fdt_node_offset_by_compatible(dtb, -1, "xen,xen") >= 0;
+}
diff --git a/arch/aarch64/arch-dtb.hh b/arch/aarch64/arch-dtb.hh
--- a/arch/aarch64/arch-dtb.hh
+++ b/arch/aarch64/arch-dtb.hh
@@ -131,4 +131,11 @@ bool dtb_get_pci_irqmap(u32 *bdfs, int *irq_ids, int
n);
#define DTB_PHYSHI_D_SH 11
#define DTB_PHYSHI_F_SH 8
+/* bool dtb_get_vmm_is_xen();
+ *
+ * Returns true if Xen hypervisor is detected.
+ */
+
+bool dtb_get_vmm_is_xen();
+
#endif /* ARCH_DTB_HH */
diff --git a/arch/aarch64/arch-mmu.hh b/arch/aarch64/arch-mmu.hh
--- a/arch/aarch64/arch-mmu.hh
+++ b/arch/aarch64/arch-mmu.hh
@@ -19,7 +19,7 @@
namespace mmu {
constexpr int max_phys_addr_size = 48;
// device_range_* are used only for debug purpose
-constexpr int device_range_start = 0x8000000;
+constexpr int device_range_start = 0x3000000;
constexpr int device_range_stop = 0x40000000;
extern u64 mem_addr; /* set by the dtb_setup constructor */
diff --git a/arch/aarch64/arch-setup.cc b/arch/aarch64/arch-setup.cc
--- a/arch/aarch64/arch-setup.cc
+++ b/arch/aarch64/arch-setup.cc
@@ -19,6 +19,7 @@
#include "arch-mmu.hh"
#include "arch-dtb.hh"
+#include "xen.hh"
#include "drivers/console.hh"
#include "drivers/pl011.hh"
@@ -39,6 +40,36 @@ void setup_temporary_phys_map()
mmu::flush_tlb_all();
}
+void arch_setup_pci()
+{
+ pci::set_pci_ecam(dtb_get_pci_is_ecam());
+
+ /* linear_map [TTBR0 - PCI config space] */
+ u64 pci_cfg;
+ size_t pci_cfg_len;
+ if (!dtb_get_pci_cfg(&pci_cfg, &pci_cfg_len))
+ return;
+
+ pci::set_pci_cfg(pci_cfg, pci_cfg_len);
+ pci_cfg = pci::get_pci_cfg(&pci_cfg_len);
+ mmu::linear_map((void *)pci_cfg, (mmu::phys)pci_cfg, pci_cfg_len,
+ mmu::page_size, mmu::mattr::dev);
+
+ /* linear_map [TTBR0 - PCI I/O and memory ranges] */
+ u64 ranges[2]; size_t ranges_len[2];
+ if (!dtb_get_pci_ranges(ranges, ranges_len, 2)) {
+ abort("arch-setup: failed to get PCI ranges.\n");
+ }
+ pci::set_pci_io(ranges[0], ranges_len[0]);
+ pci::set_pci_mem(ranges[1], ranges_len[1]);
+ ranges[0] = pci::get_pci_io(&ranges_len[0]);
+ ranges[1] = pci::get_pci_mem(&ranges_len[1]);
+ mmu::linear_map((void *)ranges[0], (mmu::phys)ranges[0], ranges_len[0],
+ mmu::page_size, mmu::mattr::dev);
+ mmu::linear_map((void *)ranges[1], (mmu::phys)ranges[1], ranges_len[1],
+ mmu::page_size, mmu::mattr::dev);
+}
+
void arch_setup_free_memory()
{
setup_temporary_phys_map();
@@ -60,10 +91,12 @@ void arch_setup_free_memory()
mmu::linear_map((void *)mmu::mem_addr, (mmu::phys)mmu::mem_addr,
addr - mmu::mem_addr);
- /* linear_map [TTBR0 - UART] */
- addr = (mmu::phys)console::arch_early_console.get_base_addr();
- mmu::linear_map((void *)addr, addr, 0x1000, mmu::page_size,
- mmu::mattr::dev);
+ if (!is_xen()) {
+ /* linear_map [TTBR0 - UART] */
+ addr = (mmu::phys)console::aarch64_console.pl011.get_base_addr();
+ mmu::linear_map((void *)addr, addr, 0x1000, mmu::page_size,
+ mmu::mattr::dev);
+ }
/* linear_map [TTBR0 - GIC DIST and GIC CPU] */
u64 dist, cpu;
@@ -77,32 +110,7 @@ void arch_setup_free_memory()
mmu::linear_map((void *)cpu, (mmu::phys)cpu, cpu_len, mmu::page_size,
mmu::mattr::dev);
- pci::set_pci_ecam(dtb_get_pci_is_ecam());
-
- /* linear_map [TTBR0 - PCI config space] */
- u64 pci_cfg;
- size_t pci_cfg_len;
- if (!dtb_get_pci_cfg(&pci_cfg, &pci_cfg_len)) {
- abort("arch-setup: failed to get PCI configuration.\n");
- }
- pci::set_pci_cfg(pci_cfg, pci_cfg_len);
- pci_cfg = pci::get_pci_cfg(&pci_cfg_len);
- mmu::linear_map((void *)pci_cfg, (mmu::phys)pci_cfg, pci_cfg_len,
- mmu::page_size, mmu::mattr::dev);
-
- /* linear_map [TTBR0 - PCI I/O and memory ranges] */
- u64 ranges[2]; size_t ranges_len[2];
- if (!dtb_get_pci_ranges(ranges, ranges_len, 2)) {
- abort("arch-setup: failed to get PCI ranges.\n");
- }
- pci::set_pci_io(ranges[0], ranges_len[0]);
- pci::set_pci_mem(ranges[1], ranges_len[1]);
- ranges[0] = pci::get_pci_io(&ranges_len[0]);
- ranges[1] = pci::get_pci_mem(&ranges_len[1]);
- mmu::linear_map((void *)ranges[0], (mmu::phys)ranges[0], ranges_len[0],
- mmu::page_size, mmu::mattr::dev);
- mmu::linear_map((void *)ranges[1], (mmu::phys)ranges[1], ranges_len[1],
- mmu::page_size, mmu::mattr::dev);
+ arch_setup_pci();
mmu::switch_to_runtime_page_tables();
@@ -152,8 +160,11 @@ void arch_init_drivers()
pci::dump_pci_irqmap();
// Enumerate PCI devices
- pci::pci_device_enumeration();
- boot_time.event("pci enumerated");
+ size_t pci_cfg_len;
+ if (pci::get_pci_cfg(&pci_cfg_len)) {
+ pci::pci_device_enumeration();
+ boot_time.event("pci enumerated");
+ }
// Initialize all drivers
hw::driver_manager* drvman = hw::driver_manager::instance();
@@ -167,15 +178,23 @@ void arch_init_drivers()
void arch_init_early_console()
{
+ if (is_xen()) {
+ new (&console::aarch64_console.xen) console::XEN_Console();
+ console::arch_early_console = console::aarch64_console.xen;
+ return;
+ }
+
+ new (&console::aarch64_console.pl011) console::PL011_Console();
+ console::arch_early_console = console::aarch64_console.pl011;
int irqid;
u64 addr = dtb_get_uart(&irqid);
if (!addr) {
/* keep using default addresses */
return;
}
- console::arch_early_console.set_base_addr(addr);
- console::arch_early_console.set_irqid(irqid);
+ console::aarch64_console.pl011.set_base_addr(addr);
+ console::aarch64_console.pl011.set_irqid(irqid);
}
bool arch_setup_console(std::string opt_console)
diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
--- a/arch/aarch64/boot.S
+++ b/arch/aarch64/boot.S
@@ -31,6 +31,9 @@ start_elf:
str x5, [x1, #:lo12:dtb]
mov x29, xzr
+ bl init_xen
+
+ mov x29, xzr
bl premain
adrp x3, __argc
diff --git a/arch/aarch64/early-console.cc b/arch/aarch64/early-console.cc
--- a/arch/aarch64/early-console.cc
+++ b/arch/aarch64/early-console.cc
@@ -5,11 +5,14 @@
* BSD license as described in the LICENSE file in the top-level directory.
*/
-#include "drivers/pl011.hh"
#include <osv/prio.hh>
+#include "early-console.hh"
+#include "xen.hh"
+
namespace console {
-PL011_Console arch_early_console
__attribute__((init_priority((int)init_prio::console)));
+union AARCH64_Console aarch64_console;
+console_driver & arch_early_console = aarch64_console.pl011;
}
diff --git a/arch/aarch64/early-console.hh b/arch/aarch64/early-console.hh
--- a/arch/aarch64/early-console.hh
+++ b/arch/aarch64/early-console.hh
@@ -8,11 +8,22 @@
#ifndef EARLY_CONSOLE_HH
#define EARLY_CONSOLE_HH
-#include "drivers/pl011.hh"
+#include <drivers/console-driver.hh>
+#include <drivers/pl011.hh>
+#include <drivers/xenconsole.hh>
namespace console {
-extern PL011_Console arch_early_console;
+union AARCH64_Console {
+ PL011_Console pl011;
+ XEN_Console xen;
+
+ AARCH64_Console() {}; /* placement new is used to initialize object */
+ ~AARCH64_Console() {}; /* won't ever be called */
+};
+
+extern AARCH64_Console aarch64_console;
+extern console_driver & arch_early_console;
}
diff --git a/arch/aarch64/hypercall.S b/arch/aarch64/hypercall.S
--- a/arch/aarch64/hypercall.S
+++ b/arch/aarch64/hypercall.S
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include <xen/interface/xen.h>
+
+#define _hypercall(call) \
+ .align 16; \
+ .globl HYPERVISOR_##call; \
+ .type HYPERVISOR_##call , "function"; \
+ HYPERVISOR_##call: \
+ mov x16, #__HYPERVISOR_##call; \
+ hvc 0xEA1; \
+ ret;
+
+.text
+_hypercall(sched_op)
+_hypercall(memory_op)
+_hypercall(multicall)
+_hypercall(event_channel_op)
+_hypercall(xen_version)
+_hypercall(console_io)
+_hypercall(physdev_op)
+_hypercall(grant_table_op)
+_hypercall(vcpu_op)
+_hypercall(platform_op_raw)
+_hypercall(hvm_op)
diff --git a/arch/aarch64/preboot.S b/arch/aarch64/preboot.S
--- a/arch/aarch64/preboot.S
+++ b/arch/aarch64/preboot.S
@@ -11,6 +11,30 @@ target = . + 0x10000
.text
.align 16
+_head:
+ /* Image header expected by Linux boot-loaders, see
+ * Documentation/arm64/booting.txt in Linux tree for format description
+ */
+ b prestart // jump to actual prestart
+ .long 0 // reserved
+ .long 0x00080000 // image load offset
+ .long 0x00000000
+ .long 0 // unused image size -- already known by
+ .long 0 // image loader, thus ignored
+ .long 0 // unused informative flags, Xen/QEMU
+ .long 0 // image loaders ignore this field
+ .long 0 // reserved
+ .long 0 // reserved
+ .long 0 // reserved
+ .long 0 // reserved
+ .long 0 // reserved
+ .long 0 // reserved
+ .byte 0x41 // magic number, "ARM\x64"
+ .byte 0x52
+ .byte 0x4d
+ .byte 0x64
+ .long 0 // reserved
+
.globl prestart
prestart: // x4 = 0x40080000 set by qemu bootloader
mov x5, x0 /* save device tree blob addr */
diff --git a/arch/aarch64/xen.cc b/arch/aarch64/xen.cc
--- a/arch/aarch64/xen.cc
+++ b/arch/aarch64/xen.cc
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include <osv/types.h>
+#include <xen/interface/xen.h>
+
+#include "arch-dtb.hh"
+#include "xen.hh"
+
+shared_info_t *HYPERVISOR_shared_info;
+
+namespace xen {
+
+shared_info_t dummy_info;
+
+}
+
+extern "C" {
+
+void init_xen()
+{
+ HYPERVISOR_shared_info = nullptr;
+ if (dtb_get_vmm_is_xen()) {
+ /* set valid pointer just to know we're under Xen.
+ * Real shared page will be set up later, when page allocator
works.
+ */
+ HYPERVISOR_shared_info = &xen::dummy_info;
+ }
+}
+}
diff --git a/arch/aarch64/xen.hh b/arch/aarch64/xen.hh
--- a/arch/aarch64/xen.hh
+++ b/arch/aarch64/xen.hh
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#ifndef XEN_HH
+#define XEN_HH
+#include <xen/interface/xen.h>
+
+extern "C" shared_info_t *HYPERVISOR_shared_info;
+
+#define is_xen() (HYPERVISOR_shared_info != nullptr)
+
+#endif /* XEN_HH */
diff --git a/bsd/aarch64/machine/xen/hypercall.h
b/bsd/aarch64/machine/xen/hypercall.h
--- a/bsd/aarch64/machine/xen/hypercall.h
+++ b/bsd/aarch64/machine/xen/hypercall.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#ifndef __MACHINE_XEN_HYPERCALL_H__
+#define __MACHINE_XEN_HYPERCALL_H__
+
+#include <xen/interface/xen.h>
+
+#define ENOXENSYS 38
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int HYPERVISOR_sched_op(int cmd, void *arg);
+int HYPERVISOR_memory_op(unsigned int cmd, void *arg);
+int HYPERVISOR_multicall(multicall_entry_t *call_list, unsigned int
nr_calls);
+int HYPERVISOR_event_channel_op(int cmd, void *arg);
+int HYPERVISOR_xen_version(int cmd, void *arg);
+int HYPERVISOR_console_io(int cmd, unsigned int count, char *str);
+int HYPERVISOR_physdev_op(int cmd, void *arg);
+int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int
count);
+int HYPERVISOR_vcpu_op(int cmd, unsigned int vcpuid, void *extra_args);
+int HYPERVISOR_platform_op_raw(struct xen_platform_op *platform_op);
+unsigned long HYPERVISOR_hvm_op(int op, void *arg);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+static inline int
+HYPERVISOR_platform_op(struct xen_platform_op *platform_op)
+{
+ platform_op->interface_version = XENPF_INTERFACE_VERSION;
+ return HYPERVISOR_platform_op_raw(platform_op);
+}
+
+static inline int
+HYPERVISOR_suspend(unsigned long mfn)
+{
+ struct sched_shutdown sched_shutdown = {
+ .reason = SHUTDOWN_suspend
+ };
+
+ return HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
+}
+
+static inline int
+HYPERVISOR_sched_op_compat(
+ int cmd, unsigned long arg)
+{
+ abort();
+}
+
+static inline int
+HYPERVISOR_update_va_mapping(
+ unsigned long va, uint64_t new_val, unsigned long flags)
+{
+ abort();
+}
+
+static inline int
+HYPERVISOR_mmu_update(
+ mmu_update_t *req, unsigned int count, unsigned int *success_count,
+ domid_t domid)
+{
+ abort();
+}
+#endif /* __MACHINE_XEN_HYPERCALL_H__ */
diff --git a/bsd/sys/xen/hypervisor.h b/bsd/sys/xen/hypervisor.h
--- a/bsd/sys/xen/hypervisor.h
+++ b/bsd/sys/xen/hypervisor.h
@@ -58,9 +58,9 @@ extern start_info_t *xen_start_info;
extern uint64_t get_system_time(int ticks);
static inline int
-HYPERVISOR_console_write(char *str, int count)
+HYPERVISOR_console_write(const char *str, int count)
{
- return HYPERVISOR_console_io(CONSOLEIO_write, count, str);
+ return HYPERVISOR_console_io(CONSOLEIO_write, count,
const_cast<char*>(str));
}
static inline void HYPERVISOR_crash(void) __dead2;
diff --git a/bsd/sys/xen/interface/arch-aarch64.h
b/bsd/sys/xen/interface/arch-aarch64.h
--- a/bsd/sys/xen/interface/arch-aarch64.h
+++ b/bsd/sys/xen/interface/arch-aarch64.h
@@ -0,0 +1,52 @@
+/*
+ * arch-aarch64.h
+ *
+ * based on arch-x86/xen.h
+ *
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+
+*/
+
+#include "xen.h"
+
+#ifndef __XEN_PUBLIC_ARCH_AARCH64_H__
+#define __XEN_PUBLIC_ARCH_AARCH64_H__
+
+#define ___DEFINE_XEN_GUEST_HANDLE(name, type)
\
+ typedef struct { type *p; } __guest_handle_##name
+
+#define __DEFINE_XEN_GUEST_HANDLE(name, type) \
+ ___DEFINE_XEN_GUEST_HANDLE(name, type); \
+ ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
+
+#define DEFINE_XEN_GUEST_HANDLE(name) __DEFINE_XEN_GUEST_HANDLE(name,
name)
+#define XEN_GUEST_HANDLE(name) __guest_handle_##name
+
+#define __HYPERVISOR_platform_op_raw __HYPERVISOR_platform_op
+
+/* Maximum number of virtual CPUs in multi-processor guests. */
+#define MAX_VIRT_CPUS 1
+
+#ifndef __ASSEMBLY__
+typedef uint64_t xen_pfn_t;
+#define PRI_xen_pfn "llx"
+typedef uint64_t xen_ulong_t;
+#define PRI_xen_ulong "llx"
+
+struct arch_vcpu_info {
+};
+typedef struct arch_vcpu_info arch_vcpu_info_t;
+
+struct arch_shared_info {
+};
+
+typedef struct arch_shared_info arch_shared_info_t;
+
+typedef unsigned long xen_callback_t;
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __XEN_PUBLIC_ARCH_AARCH64_H__ */
diff --git a/bsd/sys/xen/interface/xen.h b/bsd/sys/xen/interface/xen.h
--- a/bsd/sys/xen/interface/xen.h
+++ b/bsd/sys/xen/interface/xen.h
@@ -33,6 +33,8 @@
#include "arch-x86/xen.h"
#elif defined(__ia64__)
#include "arch-ia64.h"
+#elif defined(__aarch64__)
+#include "arch-aarch64.h"
#else
#error "Unsupported architecture"
#endif
diff --git a/compiler/include/intrinsics.hh b/compiler/include/intrinsics.hh
--- a/compiler/include/intrinsics.hh
+++ b/compiler/include/intrinsics.hh
@@ -2,7 +2,7 @@
#ifndef COMPILER_INTRINSICS_HH
#define COMPILER_INTRINSICS_HH
-#ifndef ASSEMBLY
+#ifndef __ASSEMBLY__
#if __GNUC__ == 4 && __GNUC_MINOR__ < 8
diff --git a/drivers/xenconsole.cc b/drivers/xenconsole.cc
--- a/drivers/xenconsole.cc
+++ b/drivers/xenconsole.cc
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include <bsd/porting/netport.h> /* __dead2 defined here */
+#include <xen/hypervisor.h>
+
+#include "xenconsole.hh"
+
+namespace console {
+
+void XEN_Console::write(const char *str, size_t len) {
+ HYPERVISOR_console_write(str, len);
+}
+
+void XEN_Console::dev_start()
+{
+}
+
+void XEN_Console::flush()
+{
+}
+
+bool XEN_Console::input_ready()
+{
+ return false; /*TODO: support input */
+}
+
+char XEN_Console::readch() {
+ return '\0'; /*TODO: support input */
+}
+
+}
diff --git a/drivers/xenconsole.hh b/drivers/xenconsole.hh
--- a/drivers/xenconsole.hh
+++ b/drivers/xenconsole.hh
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 Sergiy Kibrik <sergiy.kib...@globallogic.com>
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#ifndef XEN_CONSOLE_HH
+#define XEN_CONSOLE_HH
+
+#include "console-driver.hh"
+#include "exceptions.hh"
+#include <osv/interrupt.hh>
+
+namespace console {
+
+class XEN_Console : public console_driver {
+public:
+ virtual void write(const char *str, size_t len);
+ virtual void flush();
+ virtual bool input_ready();
+ virtual char readch();
+
+private:
+ virtual void dev_start();
+ virtual const char *thread_name() { return "xen-input"; }
+};
+
+}
+
+#endif /* XEN_CONSOLE_HH */
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