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* fhandler.h (fhandler_dev_mem): Erase member `init_phase' and 

member function `init'.
        * fhandler_mem.cc: Add typedefs for NT internal data types
        `SYSTEM_INFORMATION_CLASS' and `SYSTEM_BASIC_INFORMATION'.
        Add prototype for `NtQuerySystemInformation' function.
        (fhandler_dev_mem::fhandler_dev_mem): Takes over initialization task
        from `init'. Use `NtQuerySystemInformation' function to evaluate the
        size of physical memory instead of interval search.
        (fhandler_dev_mem::init): Eliminated.
        (fhandler_dev_mem::open): Don't call `init'.
        (fhandler_dev_mem::read): Eliminate check for `init_phase'.
        (dummy_autoload): Add load statement for `NtQuerySystemInformation'.
This commit is contained in:
Corinna Vinschen 2000-10-09 13:19:41 +00:00
parent b9e7a2b666
commit 42f1b6c544
3 changed files with 62 additions and 36 deletions
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15
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,18 @@
Mon Oct 9 15:11:00 2000 Corinna Vinschen <corinna@vinschen.de>
* fhandler.h (fhandler_dev_mem): Erase member `init_phase' and
member function `init'.
* fhandler_mem.cc: Add typedefs for NT internal data types
`SYSTEM_INFORMATION_CLASS' and `SYSTEM_BASIC_INFORMATION'.
Add prototype for `NtQuerySystemInformation' function.
(fhandler_dev_mem::fhandler_dev_mem): Takes over initialization task
from `init'. Use `NtQuerySystemInformation' function to evaluate the
size of physical memory instead of interval search.
(fhandler_dev_mem::init): Eliminated.
(fhandler_dev_mem::open): Don't call `init'.
(fhandler_dev_mem::read): Eliminate check for `init_phase'.
(dummy_autoload): Add load statement for `NtQuerySystemInformation'.
Sun Oct 8 22:38:40 2000 Christopher Faylor <cgf@cygnus.com>
* dtable.cc (set_std_handle): Use std_consts array to control

3
winsup/cygwin/fhandler.h
View File

@ -776,9 +776,6 @@ protected:
int unit;
DWORD mem_size;
DWORD pos;
bool init_phase;
void init (void);
public:
fhandler_dev_mem (const char *name, int unit);

80
winsup/cygwin/fhandler_mem.cc
View File

@ -22,10 +22,36 @@
#include "fhandler.h"
#include "path.h"
/*
* The following both data structures aren't defined anywhere in the Microsoft
* header files. Taken from the book "Windows NT/2000 Native API Reference"
* by Gary Nebbett.
*/
typedef enum _SYSTEM_INFORMATION_CLASS {
SystemBasicInformation = 0
/* Dropped each other since not used here. */
} SYSTEM_INFORMATION_CLASS;
typedef struct _SYSTEM_BASIC_INFORMATION {
ULONG Unknown;
ULONG MaximumIncrement;
ULONG PhysicalPageSize;
ULONG NumberOfPhysicalPages;
ULONG LowestPhysicalPage;
ULONG HighestPhysicalPage;
ULONG AllocationGranularity;
ULONG LowestUserAddress;
ULONG HighestUserAddress;
ULONG ActiveProcessors;
ULONG NumberProcessors;
} SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
extern "C" {
NTSTATUS NTAPI NtMapViewOfSection(HANDLE,HANDLE,PVOID*,ULONG,ULONG,
PLARGE_INTEGER,PULONG,SECTION_INHERIT,
ULONG,ULONG);
PLARGE_INTEGER,PULONG,SECTION_INHERIT,
ULONG,ULONG);
NTSTATUS NTAPI NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS,
PVOID,ULONG,PULONG);
NTSTATUS NTAPI NtOpenSection(PHANDLE,ACCESS_MASK,POBJECT_ATTRIBUTES);
NTSTATUS NTAPI NtUnmapViewOfSection(HANDLE,PVOID);
VOID NTAPI RtlInitUnicodeString(PUNICODE_STRING,PCWSTR);
@ -37,37 +63,22 @@ ULONG NTAPI RtlNtStatusToDosError(NTSTATUS);
fhandler_dev_mem::fhandler_dev_mem (const char *name, int nunit)
: fhandler_base (FH_MEM, name),
unit (nunit),
init_phase (false)
{
}
fhandler_dev_mem::~fhandler_dev_mem (void)
{
}
void
fhandler_dev_mem::init ()
unit (nunit)
{
if (unit == 1) /* /dev/mem */
{
long page_size = getpagesize ();
char buf[1];
init_phase = true;
mem_size = pos = 1 << 30;
for (off_t afct = 1 << 29; afct >= page_size; afct >>= 1)
NTSTATUS ret;
SYSTEM_BASIC_INFORMATION sbi;
if ((ret = NtQuerySystemInformation (SystemBasicInformation, (PVOID) &sbi,
sizeof sbi, NULL)) != STATUS_SUCCESS)
{
if (read (buf, 1) > 0)
pos += afct;
else
{
if (pos < mem_size)
mem_size = pos;
pos -= afct;
}
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
debug_printf("NtQuerySystemInformation: ret = %d, Dos(ret) = %d",
ret, RtlNtStatusToDosError (ret));
mem_size = 0;
}
pos = 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 */
@ -82,9 +93,13 @@ fhandler_dev_mem::init ()
}
else
{
debug_printf ("Illegal unit!!!");
mem_size = 0;
debug_printf ("Illegal minor number!!!");
}
init_phase = false;
}
fhandler_dev_mem::~fhandler_dev_mem (void)
{
}
int
@ -140,7 +155,6 @@ fhandler_dev_mem::open (const char *, int flags, mode_t)
}
set_io_handle (mem);
init ();
return 1;
}
@ -224,8 +238,7 @@ fhandler_dev_mem::read (void *ptr, size_t ulen)
0,
PAGE_READONLY)) != STATUS_SUCCESS)
{
if (!init_phase) /* Don't want to flood debug output with init crap. */
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
__seterrno_from_win_error (RtlNtStatusToDosError (ret));
return -1;
}
@ -453,6 +466,7 @@ dummy_autoload (void)
LoadDLLinit (ntdll)
LoadDLLfuncEx (NtMapViewOfSection, 40, ntdll, 1)
LoadDLLfuncEx (NtOpenSection, 12, ntdll, 1)
LoadDLLfuncEx (NtQuerySystemInformation, 16, ntdll, 1)
LoadDLLfuncEx (NtUnmapViewOfSection, 8, ntdll, 1)
LoadDLLfuncEx (RtlInitUnicodeString, 8, ntdll, 1)
LoadDLLfuncEx (RtlNtStatusToDosError, 4, ntdll, 1)