215 lines
2.8 KiB
ArmAsm
215 lines
2.8 KiB
ArmAsm
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//
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// Helper functions for various LOAD/VERIFY/SAVE routine variants (IEC / U64 / etc.)
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//
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lvs_handle_byte_load_verify:
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ldy VERCKK
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bne lvs_handle_byte_verify
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// As with our BASIC, we want to enable LOADing
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// anywhere in memory, including over the IO space.
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// Thus we have to use a helper routine in low memory
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// to do the memory access
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#if CONFIG_MEMORY_MODEL_60K
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// Save byte under ROMs and IO if required
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php
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sei
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ldx #$33
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stx $01
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ldy #0
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sta (STAL),y
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ldx #$37
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stx $01
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plp
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#else
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ldy #0
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sta (STAL),y
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#endif
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// FALLTROUGH
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lvs_handle_byte_load_verify_end:
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clc
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rts
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lvs_handle_byte_verify:
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#if CONFIG_MEMORY_MODEL_60K
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// Store byte for comparing
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sta TBTCNT
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// Retrieve byte from under ROMs and IO if required
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php
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sei
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ldx #$33
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stx $01
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ldy #0
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lda (STAL),y
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ldx #$37
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stx $01
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plp
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// Compare with stored byte
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cmp TBTCNT
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#else
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ldy #0
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cmp (STAL),y
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#endif
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beq lvs_handle_byte_load_verify_end
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sec
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rts
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lvs_advance_pointer:
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// Advance pointer
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inc STAL+0
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bne !+
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inc STAL+1
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!:
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rts
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lvs_display_searching_for:
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lda MSGFLG
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bpl lvs_display_end
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ldx #__MSG_KERNAL_SEARCHING_FOR
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jsr print_kernal_message
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ldy #$00
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!:
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cpy FNLEN
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beq lvs_display_end
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#if CONFIG_MEMORY_MODEL_60K
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ldx #<FNADDR+0
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jsr peek_under_roms
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#else // CONFIG_MEMORY_MODEL_38K
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lda (FNADDR),y
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#endif
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jsr JCHROUT
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iny
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jmp !-
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lvs_display_end:
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rts
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lvs_display_loading_verifying:
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// Display LOADING / VERIFYING and start address
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lda MSGFLG
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bpl lvs_display_end
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ldx #__MSG_KERNAL_LOADING
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lda VERCKK
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beq !+
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ldx #__MSG_KERNAL_VERIFYING
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!:
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jsr print_kernal_message
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// FALLTHROUGH
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lvs_display_start_addr:
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ldx #__MSG_KERNAL_FROM_HEX
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!:
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jsr print_kernal_message
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lda STAL+1
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jsr print_hex_byte
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lda STAL+0
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jmp print_hex_byte
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lvs_display_done:
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// Display end address
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lda MSGFLG
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bpl lvs_display_end
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ldx #__MSG_KERNAL_TO_HEX
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jmp !-
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lvs_display_saving:
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// Display SAVING and file name
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lda MSGFLG
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bpl lvs_display_end
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ldx #__MSG_KERNAL_SAVING
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jsr print_kernal_message
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ldy #$00
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!:
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cpy FNLEN
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beq !+
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lda (FNADDR), y
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jsr JCHROUT
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iny
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bne !- // jump alwayys
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!:
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jsr print_return
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rts
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lvs_error_end:
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sec
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rts
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lvs_return_last_address:
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// Return last address - Compute's Mapping the 64 says without the '+1',
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// checked (short test program) on original ROMs that this is really the case
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ldx STAL+0
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ldy STAL+1
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// FALLTHROUGH
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lvs_success_end:
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clc
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rts
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lvs_device_not_found_error:
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jsr kernalstatus_DEVICE_NOT_FOUND
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jmp kernalerror_DEVICE_NOT_FOUND
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lvs_illegal_device_number:
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jsr kernalstatus_DEVICE_NOT_FOUND
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jmp kernalerror_ILLEGAL_DEVICE_NUMBER
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lvs_load_verify_error:
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// XXX should we really return BASIC error code here?
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lda VERCKK
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bne lvs_verify_error
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lda #B_ERR_LOAD
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bne lvs_error_end
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// FALLTHROUGH
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lvs_verify_error:
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lda #B_ERR_VERIFY
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sec
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rts
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