Use of dynamic memory

[Volker Augustin]

Hello,
Is there a way to allocate a huge block of memory in the high memory area?
I just wrote "malloc" and "free" to handle the use of an already allocated 
block of memory. For example, I could allocate a static char array of fixed 
size and then use "malloc" and "free" to access this memory area dynamically.
But I don't know how much memory there is available to grub. I tried allocating 
a block of 10000 bytes (worked) and a block of 1000000 bytes (failed).

Volker