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No point in zeroing out the disk cache and the heap. Put those in a
.hugebss section which we align, but don't zero.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Use 128K for the heap, to allow TFTP buffers to be allocated there.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Add a few dprintf() statements to the core malloc/free which makes it
easier to track down bugs.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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a) initialize *all* the head nodes
b) the lowmem heap needs to be paragraph (16 byte) aligned
c) use a dedicated tag value for headnodes. The type code should be
removed and replaced with special tag values for head node and
free.
d) for libcom32 code called from the core, do NOT present a
usable bounce buffer; we should only ever use lmalloc/lfree.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Use a better malloc for the core. In particular, use the same core
that we should eventually be able to use for the entire system in
Syslinux 5 -- with module awareness, etc.
This code can also accommodate multiple heaps. Set up a separate heap
for lowmem; the intent is to use explicit lowmem allocations instead
of the static bounce buffer. The lowmem allocation is also exported
via the pmapi mechanism, so modules can safely allocate lowmem.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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