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/******************************************************************************
* kernel.c
*
* Copyright (c) 2002-2005 K A Fraser
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/version.h>
#include <xen/sched.h>
#include <xen/shadow.h>
#include <xen/guest_access.h>
#include <asm/current.h>
#include <public/nmi.h>
#include <public/version.h>
int tainted;
void cmdline_parse(char *cmdline)
{
char opt[100], *optval, *p = cmdline, *q;
struct kernel_param *param;
if ( p == NULL )
return;
/* Skip whitespace and the image name. */
while ( *p == ' ' )
p++;
if ( (p = strchr(p, ' ')) == NULL )
return;
for ( ; ; )
{
/* Skip whitespace. */
while ( *p == ' ' )
p++;
if ( *p == '\0' )
break;
/* Grab the next whitespace-delimited option. */
q = opt;
while ( (*p != ' ') && (*p != '\0') )
{
if ( (q-opt) < (sizeof(opt)-1) ) /* avoid overflow */
*q++ = *p;
p++;
}
*q = '\0';
/* Search for value part of a key=value option. */
optval = strchr(opt, '=');
if ( optval != NULL )
*optval++ = '\0'; /* nul-terminate the option value */
else
optval = q; /* default option value is empty string */
for ( param = &__setup_start; param <= &__setup_end; param++ )
{
if ( strcmp(param->name, opt ) != 0 )
continue;
switch ( param->type )
{
case OPT_STR:
strncpy(param->var, optval, param->len);
((char *)param->var)[param->len-1] = '\0';
break;
case OPT_UINT:
*(unsigned int *)param->var =
simple_strtol(optval, (char **)&optval, 0);
break;
case OPT_BOOL:
*(int *)param->var = 1;
break;
case OPT_CUSTOM:
((void (*)(char *))param->var)(optval);
break;
}
}
}
}
/**
* print_tainted - return a string to represent the kernel taint state.
*
* 'S' - SMP with CPUs not designed for SMP.
* 'M' - Machine had a machine check experience.
* 'B' - System has hit bad_page.
*
* The string is overwritten by the next call to print_taint().
*/
char *print_tainted(char *str)
{
if ( tainted )
{
snprintf(str, TAINT_STRING_MAX_LEN, "Tainted: %c%c%c%c",
tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
tainted & TAINT_BAD_PAGE ? 'B' : ' ',
tainted & TAINT_SYNC_CONSOLE ? 'C' : ' ');
}
else
{
snprintf(str, TAINT_STRING_MAX_LEN, "Not tainted");
}
return str;
}
void add_taint(unsigned flag)
{
tainted |= flag;
}
/*
* Simple hypercalls.
*/
long do_xen_version(int cmd, XEN_GUEST_HANDLE(void) arg)
{
switch ( cmd )
{
case XENVER_version:
{
return (xen_major_version() << 16) | xen_minor_version();
}
case XENVER_extraversion:
{
xen_extraversion_t extraversion;
safe_strcpy(extraversion, xen_extra_version());
if ( copy_to_guest(arg, (char *)extraversion, sizeof(extraversion)) )
return -EFAULT;
return 0;
}
case XENVER_compile_info:
{
struct xen_compile_info info;
safe_strcpy(info.compiler, xen_compiler());
safe_strcpy(info.compile_by, xen_compile_by());
safe_strcpy(info.compile_domain, xen_compile_domain());
safe_strcpy(info.compile_date, xen_compile_date());
if ( copy_to_guest(arg, &info, 1) )
return -EFAULT;
return 0;
}
case XENVER_capabilities:
{
xen_capabilities_info_t info;
extern void arch_get_xen_caps(xen_capabilities_info_t info);
memset(info, 0, sizeof(info));
arch_get_xen_caps(info);
if ( copy_to_guest(arg, (char *)info, sizeof(info)) )
return -EFAULT;
return 0;
}
case XENVER_platform_parameters:
{
xen_platform_parameters_t params = {
.virt_start = HYPERVISOR_VIRT_START
};
if ( copy_to_guest(arg, ¶ms, 1) )
return -EFAULT;
return 0;
}
case XENVER_changeset:
{
xen_changeset_info_t chgset;
safe_strcpy(chgset, xen_changeset());
if ( copy_to_guest(arg, (char *)chgset, sizeof(chgset)) )
return -EFAULT;
return 0;
}
case XENVER_get_features:
{
xen_feature_info_t fi;
struct domain *d = current->domain;
if ( copy_from_guest(&fi, arg, 1) )
return -EFAULT;
switch ( fi.submap_idx )
{
case 0:
fi.submap = 0;
if ( VM_ASSIST(d, VMASST_TYPE_pae_extended_cr3) )
fi.submap |= (1U << XENFEAT_pae_pgdir_above_4gb);
if ( shadow_mode_translate(current->domain) )
fi.submap |=
(1U << XENFEAT_writable_page_tables) |
(1U << XENFEAT_auto_translated_physmap);
if ( supervisor_mode_kernel )
fi.submap |= 1U << XENFEAT_supervisor_mode_kernel;
break;
default:
return -EINVAL;
}
if ( copy_to_guest(arg, &fi, 1) )
return -EFAULT;
return 0;
}
case XENVER_pagesize:
{
return (!guest_handle_is_null(arg) ? -EINVAL : PAGE_SIZE);
}
case XENVER_guest_handle:
{
if ( copy_to_guest(arg, (char *)current->domain->handle,
sizeof(current->domain->handle)) )
return -EFAULT;
return 0;
}
}
return -ENOSYS;
}
long register_guest_nmi_callback(unsigned long address)
{
struct vcpu *v = current;
struct domain *d = current->domain;
if ( (d->domain_id != 0) || (v->vcpu_id != 0) )
return -EINVAL;
v->nmi_addr = address;
#ifdef CONFIG_X86
/*
* If no handler was registered we can 'lose the NMI edge'. Re-assert it
* now.
*/
if ( d->shared_info->arch.nmi_reason != 0 )
set_bit(_VCPUF_nmi_pending, &v->vcpu_flags);
#endif
return 0;
}
long unregister_guest_nmi_callback(void)
{
struct vcpu *v = current;
v->nmi_addr = 0;
return 0;
}
long do_nmi_op(unsigned int cmd, XEN_GUEST_HANDLE(void) arg)
{
struct xennmi_callback cb;
long rc = 0;
switch ( cmd )
{
case XENNMI_register_callback:
rc = -EFAULT;
if ( copy_from_guest(&cb, arg, 1) )
break;
rc = register_guest_nmi_callback(cb.handler_address);
break;
case XENNMI_unregister_callback:
rc = unregister_guest_nmi_callback();
break;
default:
rc = -ENOSYS;
break;
}
return rc;
}
long do_vm_assist(unsigned int cmd, unsigned int type)
{
return vm_assist(current->domain, cmd, type);
}
long do_ni_hypercall(void)
{
/* No-op hypercall. */
return -ENOSYS;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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