ORCA-C/MM.asm

116 lines
3.2 KiB
NASM

mcopy mm.macros
****************************************************************
*
* Calloc - Allocate memory from a pool and set it to 0.
*
* Inputs:
* bytes - number of bytes to allocate
* useGlobalPool - should the memory come from the global
* (or local) pool
*
* Outputs:
* ptr - points to the first byte of the allocated memory
*
****************************************************************
*
Calloc start cc
ptr equ 0 pointer to reserved memory
subroutine (2:bytes),4
ph2 bytes reserve the memory
jsl Malloc
sta ptr save the pointer to the memory
stx ptr+2
lda bytes if there are an odd number of bytes then
tay
lsr a
bcc lb1
short M zero the first byte
lda #0
dey
sta [ptr],Y
long M
lb1 tyx done if there are no more bytes
beq lb4
lda #0
dey branch if the next word is the zeroth
dey
beq lb3
lb2 sta [ptr],Y zero full words
dey
dey
bne lb2
lb3 sta [ptr] zero the last word
lb4 return 4:ptr return the pointer
end
****************************************************************
*
* GCalloc - Allocate and clear memory from the global pool.
*
* Inputs:
* bytes - number of bytes to allocate
*
* Outputs:
* ptr - points to the first byte of the allocated memory
*
****************************************************************
*
GCalloc start cc
ptr equ 0 pointer to reserved memory
subroutine (2:bytes),4
ph2 bytes reserve the memory
jsl GMalloc
sta ptr save the pointer to the memory
stx ptr+2
lda bytes if there are an odd number of bytes then
tay
lsr a
bcc lb1
short M zero the first byte
lda #0
dey
sta [ptr],Y
long M
lb1 tyx done if there are no more bytes
beq lb4
lda #0
dey branch if the next word is the zeroth
dey
beq lb3
lb2 sta [ptr],Y zero full words
dey
dey
bne lb2
lb3 sta [ptr] zero the last word
lb4 return 4:ptr return the pointer
end
****************************************************************
*
* Malloc - Allocate memory from a pool.
*
* Inputs:
* bytes - number of bytes to allocate
* useGlobalPool - should the memory come from the global
* (or local) pool
*
* Outputs:
* ptr - points to the first byte of the allocated memory
*
****************************************************************
*
Malloc start cc
lda |useGlobalPool
jne GMalloc
jmp LMalloc
end