Mxalloc() allocates a block of memory according to specified preferences.

68 (0x44)

Available from GEMDOS version 0.19.

amount specifies the length (in bytes) of the block requested. As with Malloc(), specifying -1L for amount will return the size of the largest block of memory available. With modes 0 or 1, the size of the largest block of available RAM from the specified type of RAM is returned. Modes 2 and 3 return the size of the largest available block or whichever type of RAM had the largest block.
mode is a 16 bits wide bit array which specifies the type of memory requested as follows:

Bit	Meaning
0-1	Bits 0-1 represent a possible value of 0-3 representing the type of RAM to allocate as follows: Name Value Meaning MX_STRAM 0 Allocate only ST-RAM MX_TTRAM 1 Allocate only TT-RAM MX_PREFSTRAM 2 Allocate either, preferring ST-RAM MX_PREFTTRAM 3 Allocate either, preferring TT-RAM
2	Not used (should be set to 0).
3	If set, refer to bits 4-7 for memory protection advice, otherwise default to protection specified in program header. This bit is only valid in the presence of MiNT.
4-7	Bits 4-7 represent a possible value of 0-7 representing the memory protection mode to place on the allocated block of memory. Currently valid values are: Name Value Meaning MX_HEADER 0 Refer to Program Header MX_PRIVATE 1 Private MX_GLOBAL 2 Global MX_SUPERVISOR 3 Supervisor Mode Only Access MX_READABLE 4 Read Only Access These bits are only consulted if bit 3 is set and MiNT is present.
8-15	Not used (should be set to 0).

	move.w	mode,-(sp)
	move.l	amount,-(sp)
	move.w	#$44,-(sp)
	trap	#1
	addq.l	#8,sp

Mxalloc() returns NULL if the request could not be granted or a valid pointer to the start of the block allocated otherwise.

Mxalloc() should be used instead of Malloc() whenever it is available.

Malloc(), Mfree(), MemoryManagement