mirror of
https://github.com/cc65/cc65.git
synced 2024-11-07 06:05:50 +00:00
121 lines
2.9 KiB
ArmAsm
121 lines
2.9 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 2012-07-22
|
|
;
|
|
; unsigned char __fastcall__ em_load_driver (const char* name)
|
|
; /* Load an extended memory driver and return an error code */
|
|
|
|
|
|
.include "em-kernel.inc"
|
|
.include "em-error.inc"
|
|
.include "modload.inc"
|
|
.include "fcntl.inc"
|
|
|
|
.import pushax
|
|
.import pusha0
|
|
.import incsp2
|
|
.import _open
|
|
.import _read
|
|
.import _close
|
|
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Variables
|
|
|
|
.data
|
|
|
|
ctrl: .addr _read
|
|
.res 2 ; CALLERDATA
|
|
.res 2 ; MODULE
|
|
.res 2 ; MODULE_SIZE
|
|
.res 2 ; MODULE_ID
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Code
|
|
|
|
.code
|
|
|
|
.proc _em_load_driver
|
|
|
|
; Check if we do already have a driver loaded. This is an error. Do not
|
|
; touch A/X because they contain the file name.
|
|
|
|
ldy _em_drv
|
|
bne @L0
|
|
ldy _em_drv+1
|
|
beq @L1
|
|
@L0: lda #EM_ERR_INSTALLED
|
|
bne @L4
|
|
|
|
; Push the name onto the C stack and open the file. The parameter will get
|
|
; removed by open().
|
|
; ctrl.callerdata = open (name, O_RDONLY);
|
|
|
|
@L1: jsr pushax
|
|
lda #<O_RDONLY
|
|
jsr pusha0
|
|
ldy #4 ; Argument size
|
|
jsr _open
|
|
sta ctrl + MOD_CTRL::CALLERDATA
|
|
stx ctrl + MOD_CTRL::CALLERDATA+1
|
|
|
|
; if (ctrl.callerdata >= 0) {
|
|
|
|
txa
|
|
bmi @L3
|
|
|
|
; /* Load the module */
|
|
; Res = mod_load (&ctrl);
|
|
|
|
lda #<ctrl
|
|
ldx #>ctrl
|
|
jsr _mod_load
|
|
pha
|
|
|
|
; /* Close the input file */
|
|
; close (ctrl.callerdata);
|
|
|
|
lda ctrl + MOD_CTRL::CALLERDATA
|
|
ldx ctrl + MOD_CTRL::CALLERDATA+1
|
|
jsr _close
|
|
|
|
; /* Check the return code */
|
|
; if (Res == MLOAD_OK) {
|
|
|
|
pla
|
|
bne @L3
|
|
|
|
; Check the driver signature, install the driver.
|
|
; Res = em_install (ctrl.module);
|
|
|
|
lda ctrl + MOD_CTRL::MODULE
|
|
ldx ctrl + MOD_CTRL::MODULE+1
|
|
jsr _em_install
|
|
|
|
; If em_install was successful, we're done
|
|
|
|
tax
|
|
beq @L2
|
|
|
|
; The driver didn't install correctly. Remove it from memory and return the
|
|
; error code.
|
|
|
|
pha ; Save the error code
|
|
lda _em_drv
|
|
ldx _em_drv+1
|
|
jsr _mod_free ; Free the driver memory
|
|
jsr em_clear_ptr ; Clear em_drv
|
|
pla ; Restore the error code
|
|
ldx #0 ; We must return an int
|
|
@L2: rts ; Done
|
|
|
|
; Open or mod_load failed. Return an error code.
|
|
|
|
@L3: lda #<EM_ERR_CANNOT_LOAD
|
|
@L4: ldx #0
|
|
rts
|
|
|
|
.endproc
|
|
|
|
|