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/* fhandler_mem.cc. See fhandler.h for a description of the fhandler classes.
Copyright 1999, 2000 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <sys/termios.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <ntdef.h>
#include "autoload.h"
#include "cygheap.h"
#include "cygerrno.h"
#include "fhandler.h"
#include "path.h"
extern "C" {
NTSTATUS NTAPI NtMapViewOfSection(HANDLE,HANDLE,PVOID*,ULONG,ULONG,
PLARGE_INTEGER,PULONG,SECTION_INHERIT,
ULONG,ULONG);
NTSTATUS NTAPI NtOpenSection(PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES);
NTSTATUS NTAPI NtUnmapViewOfSection(HANDLE,PVOID);
VOID NTAPI RtlInitUnicodeString(PUNICODE_STRING,PCWSTR);
ULONG NTAPI RtlNtStatusToDosError(NTSTATUS);
}
/**********************************************************************/
/* fhandler_dev_mem */
fhandler_dev_mem::fhandler_dev_mem (const char *name, int)
: fhandler_base (FH_MEM, name),
pos(0UL)
{
}
fhandler_dev_mem::~fhandler_dev_mem (void)
{
}
int
fhandler_dev_mem::open (const char *, int flags, mode_t)
{
if (os_being_run != winNT)
{
set_errno (ENOENT);
debug_printf ("/dev/mem is accessible under NT/W2K only");
return 0;
}
UNICODE_STRING memstr;
RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes(&attr, &memstr, OBJ_CASE_INSENSITIVE, NULL, NULL);
if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
set_access (SECTION_MAP_READ);
else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
set_access (SECTION_MAP_WRITE);
else
set_access (SECTION_MAP_READ | SECTION_MAP_WRITE);
HANDLE mem;
NTSTATUS ret = NtOpenSection (&mem, get_access (), &attr);
if (!NT_SUCCESS(ret))
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
set_io_handle (NULL);
return 0;
}
set_io_handle (mem);
return 1;
}
int
fhandler_dev_mem::write (const void *ptr, size_t len)
{
set_errno (ENOSYS);
return -1;
}
int
fhandler_dev_mem::read (void *ptr, size_t ulen)
{
if (!ulen)
return 0;
PHYSICAL_ADDRESS phys;
NTSTATUS ret;
void *viewmem = NULL;
DWORD len = ulen + 4095;
phys.QuadPart = (ULONGLONG) pos;
if ((ret = NtMapViewOfSection (get_handle (),
INVALID_HANDLE_VALUE,
&viewmem,
0L,
len,
&phys,
&len,
ViewShare,
0,
PAGE_READONLY)) != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
return -1;
}
memcpy (ptr, (char *) viewmem + (pos - phys.QuadPart), ulen);
if (!NT_SUCCESS(ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, viewmem)))
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
return -1;
}
pos += ulen;
return ulen;
}
int
fhandler_dev_mem::close (void)
{
return fhandler_base::close ();
}
off_t
fhandler_dev_mem::lseek (off_t offset, int whence)
{
switch (whence)
{
case SEEK_SET:
pos = offset;
break;
case SEEK_CUR:
pos += offset;
break;
case SEEK_END:
pos = 0;
pos -= offset;
break;
default:
set_errno (EINVAL);
return (off_t) -1;
}
return pos;
}
int
fhandler_dev_mem::fstat (struct stat *buf)
{
if (!buf)
{
set_errno (EINVAL);
return -1;
}
memset (buf, 0, sizeof *buf);
buf->st_mode = S_IFCHR;
if (os_being_run != winNT)
buf->st_mode |= S_IRUSR | S_IWUSR |
S_IRGRP | S_IWGRP |
S_IROTH | S_IWOTH;
buf->st_nlink = 1;
buf->st_blksize = 4096;
buf->st_dev = buf->st_rdev = get_device () << 8;
return 0;
}
int
fhandler_dev_mem::dup (fhandler_base *child)
{
set_errno (ENOSYS);
return -1;
}
void
fhandler_dev_mem::dump ()
{
paranoid_printf("here, fhandler_dev_mem");
}
extern "C" {
LoadDLLinitfunc (ntdll)
{
HANDLE h;
static NO_COPY LONG here = -1L;
while (InterlockedIncrement (&here))
{
InterlockedDecrement (&here);
small_printf ("Multiple tries to read ntdll.dll\n");
Sleep (0);
}
if (ntdll_handle)
/* nothing to do */;
else if ((h = LoadLibrary ("ntdll.dll")) != NULL)
ntdll_handle = h;
else if (!ntdll_handle)
api_fatal ("could not load ntdll.dll, %E");
InterlockedDecrement (&here);
return 0;
}
static void dummy_autoload (void) __attribute__ ((unused));
static void
dummy_autoload (void)
{
LoadDLLinit (ntdll)
LoadDLLfuncEx (NtMapViewOfSection, 40, ntdll, 1)
LoadDLLfuncEx (NtOpenSection, 12, ntdll, 1)
LoadDLLfuncEx (NtUnmapViewOfSection, 8, ntdll, 1)
LoadDLLfuncEx (RtlInitUnicodeString, 8, ntdll, 1)
LoadDLLfuncEx (RtlNtStatusToDosError, 4, ntdll, 1)
}
}
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