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libc/winsup/cygwin/fhandler_mem.cc

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/* fhandler_mem.cc. See fhandler.h for a description of the fhandler classes.
Copyright 2000, 2001 Red Hat, Inc.
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 <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <ntdef.h>
#include "cygerrno.h"
#include "fhandler.h"
#include "ntdll.h"
/**********************************************************************/
/* fhandler_dev_mem */
fhandler_dev_mem::fhandler_dev_mem (const char *name, int nunit)
: fhandler_base (FH_MEM, name),
unit (nunit)
{
/* Reading physical memory only supported on NT/W2K. */
if (os_being_run != winNT)
{
mem_size = 0;
return;
}
if (unit == 1) /* /dev/mem */
{
NTSTATUS ret;
SYSTEM_BASIC_INFORMATION sbi;
if ((ret = NtQuerySystemInformation (SystemBasicInformation, (PVOID) &sbi,
sizeof sbi, NULL)) != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
debug_printf("NtQuerySystemInformation: ret = %d, Dos(ret) = %d",
ret, RtlNtStatusToDosError (ret));
mem_size = 0;
}
else
mem_size = sbi.PhysicalPageSize * sbi.NumberOfPhysicalPages;
debug_printf ("MemSize: %d MB", mem_size >> 20);
}
else if (unit == 2) /* /dev/kmem - Not yet supported */
{
mem_size = 0;
debug_printf ("KMemSize: %d MB", mem_size >> 20);
}
else if (unit == 4) /* /dev/port == First 64K of /dev/mem */
{
mem_size = 65536;
debug_printf ("PortSize: 64 KB");
}
else
{
mem_size = 0;
debug_printf ("Illegal minor number!!!");
}
}
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 ("%s is accessible under NT/W2K only",
unit == 1 ? "/dev/mem" :
unit == 2 ? "/dev/kmem" :
"/dev/port");
return 0;
}
/* Check for illegal flags. */
if (flags & (O_APPEND | O_TRUNC | O_EXCL))
{
set_errno (EINVAL);
return 0;
}
UNICODE_STRING memstr;
RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes(&attr, &memstr,
OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
NULL, NULL);
ACCESS_MASK section_access;
if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
{
set_access (GENERIC_READ);
section_access = SECTION_MAP_READ;
}
else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
{
set_access (GENERIC_WRITE);
section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
}
else
{
set_access (GENERIC_READ | GENERIC_WRITE);
section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
}
HANDLE mem;
NTSTATUS ret = NtOpenSection (&mem, section_access, &attr);
if (!NT_SUCCESS(ret))
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
set_io_handle (NULL);
return 0;
}
set_io_handle (mem);
set_open_status ();
return 1;
}
int
fhandler_dev_mem::write (const void *ptr, size_t ulen)
{
if (!ulen || pos >= mem_size)
return 0;
if (!(get_access () & GENERIC_WRITE))
{
set_errno (EINVAL);
return -1;
}
if (pos + ulen > mem_size)
ulen = mem_size - pos;
PHYSICAL_ADDRESS phys;
NTSTATUS ret;
void *viewmem = NULL;
DWORD len = ulen + getpagesize () - 1;
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 ((char *) viewmem + (pos - phys.QuadPart), ptr, 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::read (void *ptr, size_t ulen)
{
if (!ulen || pos >= mem_size)
return 0;
if (!(get_access () & GENERIC_READ))
{
set_errno (EINVAL);
return -1;
}
if (pos + ulen > mem_size)
ulen = mem_size - pos;
PHYSICAL_ADDRESS phys;
NTSTATUS ret;
void *viewmem = NULL;
DWORD len = ulen + getpagesize () - 1;
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 = mem_size;
pos += offset;
break;
default:
set_errno (EINVAL);
return (off_t) -1;
}
if (pos > mem_size)
{
set_errno (EINVAL);
return (off_t) -1;
}
return pos;
}
HANDLE
fhandler_dev_mem::mmap (caddr_t *addr, size_t len, DWORD access,
int flags, off_t off)
{
if ((DWORD) off >= mem_size
|| (DWORD) len >= mem_size
|| (DWORD) off + len >= mem_size)
{
set_errno (EINVAL);
syscall_printf ("-1 = mmap(): illegal parameter, set EINVAL");
return INVALID_HANDLE_VALUE;
}
UNICODE_STRING memstr;
RtlInitUnicodeString (&memstr, L"\\device\\physicalmemory");
OBJECT_ATTRIBUTES attr;
InitializeObjectAttributes(&attr, &memstr,
OBJ_CASE_INSENSITIVE | OBJ_INHERIT,
NULL, NULL);
ACCESS_MASK section_access;
ULONG protect;
if (access & FILE_MAP_COPY)
{
section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
protect = PAGE_WRITECOPY;
}
else if (access & FILE_MAP_WRITE)
{
section_access = SECTION_MAP_READ | SECTION_MAP_WRITE;
protect = PAGE_READWRITE;
}
else
{
section_access = SECTION_MAP_READ;
protect = PAGE_READONLY;
}
HANDLE h;
NTSTATUS ret = NtOpenSection (&h, section_access, &attr);
if (!NT_SUCCESS(ret))
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
syscall_printf ("-1 = mmap(): NtOpenSection failed with %E");
return INVALID_HANDLE_VALUE;
}
PHYSICAL_ADDRESS phys;
void *base = *addr;
DWORD dlen = len;
phys.QuadPart = (ULONGLONG) off;
if ((ret = NtMapViewOfSection (h,
INVALID_HANDLE_VALUE,
&base,
0L,
dlen,
&phys,
&dlen,
ViewShare /*??*/,
0,
protect)) != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
syscall_printf ("-1 = mmap(): NtMapViewOfSection failed with %E");
return INVALID_HANDLE_VALUE;
}
if ((flags & MAP_FIXED) && base != *addr)
{
set_errno (EINVAL);
syscall_printf ("-1 = mmap(): address shift with MAP_FIXED given");
NtUnmapViewOfSection (INVALID_HANDLE_VALUE, base);
return INVALID_HANDLE_VALUE;
}
*addr = (caddr_t) base;
return h;
}
int
fhandler_dev_mem::munmap (HANDLE h, caddr_t addr, size_t len)
{
NTSTATUS ret;
if (!NT_SUCCESS(ret = NtUnmapViewOfSection (INVALID_HANDLE_VALUE, addr)))
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
return -1;
}
CloseHandle (h);
return 0;
}
int
fhandler_dev_mem::msync (HANDLE h, caddr_t addr, size_t len, int flags)
{
return 0;
}
BOOL
fhandler_dev_mem::fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
DWORD size, void *address)
{
DWORD ret;
PHYSICAL_ADDRESS phys;
void *base = address;
DWORD dlen = size;
ULONG protect;
if (access & FILE_MAP_COPY)
protect = PAGE_WRITECOPY;
else if (access & FILE_MAP_WRITE)
protect = PAGE_READWRITE;
else
protect = PAGE_READONLY;
phys.QuadPart = (ULONGLONG) offset;
if ((ret = NtMapViewOfSection (h,
INVALID_HANDLE_VALUE,
&base,
0L,
dlen,
&phys,
&dlen,
ViewShare /*??*/,
0,
protect)) != STATUS_SUCCESS)
{
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
syscall_printf ("-1 = fixup_mmap_after_fork(): NtMapViewOfSection failed with %E");
return FALSE;
}
return base == address;
}
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 = getpagesize ();
buf->st_dev = buf->st_rdev = get_device () << 8 | (unit & 0xff);
return 0;
}
int
fhandler_dev_mem::dup (fhandler_base *child)
{
int ret = fhandler_base::dup (child);
if (! ret)
{
fhandler_dev_mem *fhc = (fhandler_dev_mem *) child;
fhc->mem_size = mem_size;
fhc->pos = pos;
}
return ret;
}
void
fhandler_dev_mem::dump ()
{
paranoid_printf("here, fhandler_dev_mem");
}
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