Tear out old heap code, replace with code that simply allocates memory

for use by malloc().

This breaks the image-loading code (which previously used the heap to
allocate the buffer for downloading the image), but that's not a major
concern since I'm going to tear out all the image formats within the next
couple of days anyway.  Byebye, NBI!  :)

src/include/gpxe/heap.h

@@ -0,0 +1,15 @@
+#ifndef _GPXE_HEAP_H
+#define _GPXE_HEAP_H
+
+/**
+ * @file
+ *
+ * Heap
+ *
+ */
+
+extern char heap[];
+
+extern void init_heap ( void );
+
+#endif /* _GPXE_HEAP_H */

src/include/heap.h

@@ -1,92 +0,0 @@
-#ifndef HEAP_H
-#define HEAP_H
-
-/*
- * Allocate a block with specified (physical) alignment
- *
- * "align" must be a power of 2.
- *
- * Note that "align" affects the alignment of the physical address,
- * not the virtual address.  This is almost certainly what you want.
- *
- */
-extern void * emalloc ( size_t size, unsigned int align );
-
-/*
- * Allocate all remaining space on the heap
- *
- */
-extern void * emalloc_all ( size_t *size );
-
-/*
- * Free a block.
- *
- * The caller must ensure that the block being freed is the last (most
- * recent) block allocated on the heap, otherwise heap corruption will
- * occur.
- *
- */
-extern void efree ( void *ptr );
-
-/*
- * Free all allocated blocks on the heap
- *
- */
-extern void efree_all ( void );
-
-/*
- * Resize a block.
- *
- * The caller must ensure that the block being resized is the last
- * (most recent) block allocated on the heap, otherwise heap
- * corruption will occur.
- *
- */
-extern void * erealloc ( void *ptr, size_t size );
-
-/*
- * Allocate, free, and resize blocks without caring about alignment
- *
- */
-static inline void * malloc ( size_t size ) {
-	return emalloc ( size, sizeof ( void * ) );
-}
-
-static inline void free ( void *ptr ) {
-	efree ( ptr );
-}
-
-static inline void * realloc ( void *ptr, size_t size ) {
-	return erealloc ( ptr, size );
-}
-
-/*
- * Legacy API calls
- *
- */
-static inline void * allot ( size_t size ) {
-	return emalloc ( size, sizeof ( void * ) );
-}
-
-static inline void forget ( void *ptr ) {
-	efree ( ptr );
-}
-
-static inline void * allot2 ( size_t size, uint32_t mask ) {
-	return emalloc ( size, mask + 1 );
-}
-
-static inline void forget2 ( void *ptr ) {
-	efree ( ptr );
-}
-
-/*
- * Heap markers.  osloader.c and other code may wish to know the heap
- * location, without necessarily wanting to drag in heap.o.  We
- * therefore declare these as shared (i.e. common) symbols.
- *
- */
-physaddr_t heap_ptr __asm__ ( "_shared_heap_ptr" );
-physaddr_t heap_end __asm__ ( "_shared_heap_end" );
-
-#endif /* HEAP_H */