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memory verification

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2516 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nick 2001-10-28 16:57:04 +00:00
parent 696a43cbfa
commit 2b88e5ff5c
1 changed files with 78 additions and 6 deletions
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84
linux/vbelib.c
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@ -17,6 +17,34 @@
static struct VesaProtModeInterface vbe_pm_info;
static inline int VERR(void *p)
{
register int retval;
__asm __volatile(
"xorl %0, %0\n\t"
"verr %1\n\t"
"setnz %b0"
:"=r"(retval)
:"m"(*(unsigned char *)p)
:"memory");
return retval;
}
#if 0
static inline int VERW(void *p)
{
register int retval;
__asm __volatile(
"xorl %0, %0\n\t"
"verw %1\n\t"
"setnz %b0"
:"=r"(retval)
:"m"(*(unsigned char *)p)
:"memory");
return retval;
}
#endif
#define HAVE_VERBOSE_VAR 1
#ifdef HAVE_VERBOSE_VAR
@ -80,6 +108,36 @@ int vbeInit( void )
int vbeDestroy( void ) { return VBE_OK; }
static int check_str(unsigned char *str)
{
size_t i;
int null_found = 0;
for(i = 0;i < 256;i++)
{
if(VERR(&str[i]))
{
if(!str[i]) { null_found = 1; break; }
}
else break;
}
return null_found;
}
static int check_wrd(unsigned short *str)
{
size_t i;
int ffff_found = 0;
for(i = 0;i < 1024;i++)
{
if(VERR(&str[i]))
{
if(str[i] == 0xffff) { ffff_found = 1; break; }
}
else break;
}
return ffff_found;
}
static void print_str(unsigned char *str)
{
size_t i;
@ -125,51 +183,60 @@ int vbeGetControllerInfo(struct VbeInfoBlock *data)
fpdata.seg = (unsigned long)(data->OemStringPtr) >> 16;
fpdata.off = (unsigned long)(data->OemStringPtr) & 0xffff;
data->OemStringPtr = PhysToVirt(fpdata);
if(!check_str(data->OemStringPtr)) data->OemStringPtr = NULL;
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: OemStringPtr=%04X:%04X => %p\n",fpdata.seg,fpdata.off,data->OemStringPtr);
print_str(data->OemStringPtr);
if(data->OemStringPtr) print_str(data->OemStringPtr);
}
#endif
fpdata.seg = (unsigned long)(data->VideoModePtr) >> 16;
fpdata.off = (unsigned long)(data->VideoModePtr) & 0xffff;
data->VideoModePtr = PhysToVirt(fpdata);
if(!check_wrd(data->VideoModePtr))
{
data->VideoModePtr = NULL;
retval = VBE_BROKEN_BIOS;
}
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: VideoModePtr=%04X:%04X => %p\n",fpdata.seg,fpdata.off,data->VideoModePtr);
print_wrd(data->VideoModePtr);
if(data->VideoModePtr) print_wrd(data->VideoModePtr);
}
#endif
fpdata.seg = (unsigned long)(data->OemVendorNamePtr) >> 16;
fpdata.off = (unsigned long)(data->OemVendorNamePtr) & 0xffff;
data->OemVendorNamePtr = PhysToVirt(fpdata);
if(!check_str(data->OemVendorNamePtr)) data->OemVendorNamePtr = NULL;
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: OemVendorNamePtr=%04X:%04X => %p\n",fpdata.seg,fpdata.off,data->OemVendorNamePtr);
print_str(data->OemVendorNamePtr);
if(data->OemVendorNamePtr) print_str(data->OemVendorNamePtr);
}
#endif
fpdata.seg = (unsigned long)(data->OemProductNamePtr) >> 16;
fpdata.off = (unsigned long)(data->OemProductNamePtr) & 0xffff;
data->OemProductNamePtr = PhysToVirt(fpdata);
if(!check_str(data->OemProductNamePtr)) data->OemProductNamePtr = NULL;
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: OemProductNamePtr=%04X:%04X => %p\n",fpdata.seg,fpdata.off,data->OemProductNamePtr);
print_str(data->OemProductNamePtr);
if(data->OemVendorNamePtr) print_str(data->OemProductNamePtr);
}
#endif
fpdata.seg = (unsigned long)(data->OemProductRevPtr) >> 16;
fpdata.off = (unsigned long)(data->OemProductRevPtr) & 0xffff;
data->OemProductRevPtr = PhysToVirt(fpdata);
if(!check_str(data->OemProductRevPtr)) data->OemProductRevPtr = NULL;
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: OemProductRevPtr=%04X:%04X => %p\n",fpdata.seg,fpdata.off,data->OemProductRevPtr);
print_str(data->OemProductRevPtr);
if(data->OemProductRevPtr) print_str(data->OemProductRevPtr);
}
#endif
}
@ -375,11 +442,16 @@ int vbeGetProtModeInfo(struct VesaProtModeInterface *pm_info)
if(verbose > 1) printf("vbelib: SetPaletteData=%04X:%04X => %p\n",r.es,info_offset+rm_info->SetPaletteData,pm_info->SetPaletteData);
#endif
pm_info->iopl_ports = PhysToVirtSO(r.es,info_offset+rm_info->iopl_ports);
if(!check_wrd(pm_info->iopl_ports))
{
pm_info->iopl_ports = NULL;
retval = VBE_BROKEN_BIOS;
}
#ifdef HAVE_VERBOSE_VAR
if(verbose > 1)
{
printf("vbelib: iopl_ports=%04X:%04X => %p\n",r.es,info_offset+rm_info->iopl_ports,pm_info->iopl_ports);
print_wrd(pm_info->iopl_ports);
if(pm_info->iopl_ports) print_wrd(pm_info->iopl_ports);
}
#endif
}