> On Nov 26, 2014, at 6:14 AM, Debabrata Chattopadhyay
> <debabrata.chattopadh...@pmcs.com> wrote:
>
> Hi,
>
> In our option ROM for our storage controller , I am trying to allocate some
> memory using BS->AllocatePool().I see that the call just hangs and never
> comes out.
>
> Basically , we have a structure like this :
>
> Struct A
> {
> //some elements
> void * ptr;
> //some elements
> };
>
> We are calling BS->Allocate pool with the arguments EfiBootServicesData,
> sizeof(struct A), (void **)&p where “p” is of type Struct A * p .
>
> This allocation is successful. The return value is success.
>
> Now again after this allocation we do another call to BS->AllocatePool().
> The argument passed this time are EfiBootServicesData, sizeof(struct B),(void
> **)&p->ptr . The intention is to later typecast p->ptr to struct *B and use
> it.
>
> This allocation just hangs inside AllocatePool function and control never
> come out of AllocatePool call.
>
> Can I get come pointers to debug this issue? Am I missing any finer point
> here ? memmap command shows ample amount of memory in the system . Addresses
> allocated in first allocation looks sane enough (0xFXXXXXXX range) .
> Also I have used a skeleton EFI driver to allocate huge amount of memory
> (around 30000 bytes at one time , running into 1000 loops) with a couple of
> structure similar to structs A and B above , passed to the Allocatepoo() in
> the same way as shown above. Allocation is successful in all the 1000 loops.
> Any ideas ?
>
Likely it is some memory corruption that is causing the hang. The bug could be
earlier in your driver?
The allocation will be prefixed with a POOL_HEAD and postfixed with a POOL_TAIL
structure. The pointer returned by AllocatePool points to POOL_HEAD.Data. So
you could dump out data around your other allocations to look for buffer over
run/underrun.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Core/Dxe/Mem/Pool.c
<https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Core/Dxe/Mem/Pool.c>
#define POOL_HEAD_SIGNATURE SIGNATURE_32('p','h','d','0')
typedef struct {
UINT32 Signature;
UINT32 Reserved;
EFI_MEMORY_TYPE Type;
UINTN Size;
CHAR8 Data[1];
} POOL_HEAD;
#define SIZE_OF_POOL_HEAD OFFSET_OF(POOL_HEAD,Data)
#define POOL_TAIL_SIGNATURE SIGNATURE_32('p','t','a','l')
typedef struct {
UINT32 Signature;
UINT32 Reserved;
UINTN Size;
} POOL_TAIL;
#define POOL_SHIFT 7
#define POOL_OVERHEAD (SIZE_OF_POOL_HEAD + sizeof(POOL_TAIL))
#define HEAD_TO_TAIL(a) \
((POOL_TAIL *) (((CHAR8 *) (a)) + (a)->Size - sizeof(POOL_TAIL)));
#define SIZE_TO_LIST(a) ((a) >> POOL_SHIFT)
#define LIST_TO_SIZE(a) ((a+1) << POOL_SHIFT)
#define MAX_POOL_LIST SIZE_TO_LIST(DEFAULT_PAGE_ALLOCATION)
#define MAX_POOL_SIZE (MAX_ADDRESS - POOL_OVERHEAD)
Thanks,
Andrew Fish
> BTW the platform is Itanium (so I am building an IPF version of our oprom) ,
> 64 bit machine. And the EDK is EDK 2.0. And system BIOS is confirming to
> UEFI 2.0.
>
> Regards
> Deb
>
>
>
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