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This new function, xen_debug_putc(), is intended to be used to enable CONFIG_DEBUG_UART on xen guest. Please note that the underlying functionality in Xen is available only when Xen is configured with !NDEBUG but is much simpler than a generic HYPERVISOR_console_io(). Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Peng Fan <peng.fan@nxp.com>
28 lines
843 B
C
28 lines
843 B
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* hypercall.h
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*
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* Linux-specific hypervisor handling.
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*
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* Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
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*/
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#ifndef _ASM_ARM_XEN_HYPERCALL_H
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#define _ASM_ARM_XEN_HYPERCALL_H
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#include <xen/interface/xen.h>
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int HYPERVISOR_xen_version(int cmd, void *arg);
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int HYPERVISOR_console_io(int cmd, int count, char *str);
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int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count);
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int HYPERVISOR_sched_op(int cmd, void *arg);
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int HYPERVISOR_event_channel_op(int cmd, void *arg);
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unsigned long HYPERVISOR_hvm_op(int op, void *arg);
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int HYPERVISOR_memory_op(unsigned int cmd, void *arg);
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static inline void xen_debug_putc(int c)
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{
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register int v __asm__ ("x0") = c;
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__asm__ __volatile__("hvc 0xfffe" : "=r" (v) : "0" (v));
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}
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#endif /* _ASM_ARM_XEN_HYPERCALL_H */
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