.data
.text
- .define UART_BASE, 0x1000
- .define UART_STATUS, UART_BASE+0x4
- .define UART_RECV, UART_BASE+0x8
- .define UART_TRANS, UART_BASE+0xC
- .define UART_BAUD, UART_BASE+0x10
-
- .define UART_TRANS_EMPTY, 0
- .define UART_RECV_NEW, 1
-
- .define TIMEOUT_START, 0x13371337
- .define DEFAULT_PROG_START, 0x200
- .define STACKSTART, 0x500 ; FIXME
-;-----
-main:
- ; setup stackframe
- ldil r15, STACKSTART@lo
- ldih r15, STACKSTART@hi
- movst r15
+ .define UART_BASE, 0x2000
+ .define UART_STATUS, 0x0
+ .define UART_RECV, 0xc
+ .define UART_TRANS, 0x8
- ldil r3, TIMEOUT_START@lo
- ldih r3, TIMEOUT_START@hi
+ .define UART_TRANS_EMPTY, 0x1
+ .define UART_RECV_NEW, 0x2
-timeout_loop:
- ldil r3, UART_STATUS@lo
- ldih r3, UART_STATUS@hi
- ldw r3, 0(r3)
- andx r3, 1 << UART_RECV_NEW
- brzs+ next; branch if zero
+;-----
+start:
+ br+ main
+ br+ main
+ ret
+
+main:
+ ldi r10, UART_BASE@lo
+ ldih r10, UART_BASE@hi
+poll:
+ ldw r3, UART_STATUS(r10)
+ andx r3, UART_RECV_NEW
+ brzs+ poll; branch if zero
call recv_byte
; we received the enter bootrom sign
+ xor r1, r1, r1
cmpi r0, 0x48 ; 'H'
breq- bt_H
-
-next:
- subi r3, r3, 1
- brnz+ timeout_loop
-
- ; call to default entry point
- ldil r0, DEFAULT_PROG_START@lo
- ldih r0, DEFAULT_PROG_START@hi
- brr r0
+ br poll ; else
;-----
send_byte:
- ldil r3, UART_STATUS@lo
- ldih r3, UART_STATUS@hi
- ldw r3, 0(r3)
- andx r3, 1 << UART_TRANS_EMPTY
- brzs+ send_byte ; branch if zero
- ldil r3, UART_TRANS@lo
- ldih r3, UART_TRANS@hi
- stb r1, 0(r3)
+ ldw r3, UART_STATUS(r10)
+ andx r3, UART_TRANS_EMPTY
+ brnz+ send_byte ; branch if not zero
+ stb r1, UART_TRANS(r10)
ret
;-----
;-----
recv_byte:
- ldil r3, UART_STATUS@lo
- ldih r3, UART_STATUS@hi
- ldw r3, 0(r3)
- andx r3, 1 << UART_RECV_NEW
- brzs+ send_byte ; branch if zero
- ldil r3, UART_RECV@lo
- ldih r3, UART_RECV@hi
- ldb r0, 0(r3)
+ ldw r3, UART_STATUS(r10)
+ andx r3, UART_RECV_NEW
+ brzs+ recv_byte; branch if zero
+ xor r0, r0, r0
+ ldb r0, UART_RECV(r10)
ret
;-----
recv_word:
- ldisl r0, 0x0
+ xor r0, r0, r0
+ xor r1, r1, r1
call recv_byte
- or r0, r0, r1
+ or r1, r0, r1
call recv_byte
lls r1, r1, 8
- or r0, r0, r1
+ or r1, r0, r1
call recv_byte
- lls r1, r1, 16
- or r0, r0, r1
+ lls r1, r1, 8
+ or r1, r0, r1
call recv_byte
- lls r1, r1, 24
- or r0, r0, r1
+ lls r1, r1, 8
+ or r1, r0, r1
+
+ addi r0, r1, 0
ret
;-----
bootrom:
+ br tehend
call recv_byte
+ xor r1, r1, r1
cmpi r0, 0x57 ; 'W'
breq- bt_W
; FALL THROUGH ;)
bt_H:
- ldisl r1, 0x4f ; 'O'
+ ldi r1, 0x4f ; 'O'
call send_byte
- br bootrom
+ ; br bootrom ; FIXME
+ br tehend
bt_W:
call recv_word ; receive addr
mov r6, r0
call recv_word ; receive instr
stx r0, 0(r6)
- ldisl r1, 0x44 ; 'D'
+ ldi r1, 0x44 ; 'D'
call send_byte
br bootrom
bt_R:
call recv_word ; receive addr
mov r2, r0
- ldisl r1, 0x46 ; 'F'
+ ldi r1, 0x46 ; 'F'
call send_byte
ldx r1, 0(r2)
call send_word
mov r6, r0
call recv_word ; receive data
stw r0, 0(r6)
- ldisl r1, 0x41 ; 'A'
+ ldi r1, 0x41 ; 'A'
call send_byte
br bootrom
bt_T:
call recv_word ; receive addr
mov r2, r0
- ldisl r1, 0x47 ; 'G'
+ ldi r1, 0x47 ; 'G'
call send_byte
ldw r1, 0(r2)
call send_word
call recv_word
brr r0
-; 102 instr. please update after modification
+tehend:
-- when "00000000111" => data_out <= x"e7a00004";
-- when "00000001000" => data_out <= x"e7280004";
-- -- when "00000001001" => data_out <= x"eb7ffb81";
- when "0000000" => data_out <= x"eb000183"; -- br+ main
- when "0000001" => data_out <= x"eb000487"; -- call+ uartrdy
+ when "0000000" => data_out <= x"eb000183"; -- br+ main
+ when "0000001" => data_out <= x"eb000103"; -- br+ main
when "0000010" => data_out <= x"eb000008"; -- ret
- when "0000011" => data_out <= x"ed090058"; -- ldi r1, 0x200b
- when "0000100" => data_out <= x"ed110060"; -- ldi r2, 0x200c
- when "0000101" => data_out <= x"ed190080"; -- ldi r3, 0x2010
- when "0000110" => data_out <= x"ed210120"; -- ldi r4, 0x2024
- when "0000111" => data_out <= x"ed280018"; -- ldi r5, 3
- when "0001000" => data_out <= x"e7aa0000"; -- stw r5, 0(r4)
- when "0001001" => data_out <= x"eb7ffb83"; -- br+ start
- when "0001010" => data_out <= x"e7390000"; -- ldw r7, 0(r2)
- when "0001011" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0001100" => data_out <= x"ed500208"; -- ldi r10, 0x41
- when "0001101" => data_out <= x"e7d08000"; -- stw r10, 0(r1)
- when "0001110" => data_out <= x"ed4101a0"; -- ldi r8, 0x2034
- when "0001111" => data_out <= x"ed4901c0"; -- ldi r9, 0x2038
- when "0010000" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0010001" => data_out <= x"e45dd800"; -- xor r11, r11, r11
- when "0010010" => data_out <= x"ed500000"; -- ldi r10, 0
- when "0010011" => data_out <= x"e7d40000"; -- stw r10, 0(r8)
- when "0010100" => data_out <= x"ed580c18"; -- ldi r11, 0x0183
- when "0010101" => data_out <= x"ed5f5802"; -- ldih r11, 0xeb00
- when "0010110" => data_out <= x"e7dc8000"; -- stw r11, 0(r9)
- when "0010111" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0011000" => data_out <= x"ed500008"; -- ldi r10, 1
- when "0011001" => data_out <= x"e7d40000"; -- stw r10, 0(r8)
- when "0011010" => data_out <= x"ed580838"; -- ldi r11, 0x107
- when "0011011" => data_out <= x"ed5f5802"; -- ldih r11, 0xeb00
- when "0011100" => data_out <= x"e7dc8000"; -- stw r11, 0(r9)
- when "0011101" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0011110" => data_out <= x"ed500010"; -- ldi r10, 2
- when "0011111" => data_out <= x"e7d40000"; -- stw r10, 0(r8)
- when "0100000" => data_out <= x"ed580040"; -- ldi r11, 0x8
- when "0100001" => data_out <= x"ed5f5802"; -- ldih r11, 0xeb00
- when "0100010" => data_out <= x"e7dc8000"; -- stw r11, 0(r9)
- when "0100011" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0100100" => data_out <= x"ed500020"; -- ldi r10, 4
- when "0100101" => data_out <= x"e7d40000"; -- stw r10, 0(r8)
- when "0100110" => data_out <= x"ed5c0000"; -- ldi r11, 0x8000
- when "0100111" => data_out <= x"ed5f3dc2"; -- ldih r11, 0xe7b8
- when "0101000" => data_out <= x"e7dc8000"; -- stw r11, 0(r9)
- when "0101001" => data_out <= x"e4555000"; -- xor r10, r10, r10
- when "0101010" => data_out <= x"ed500028"; -- ldi r10, 5
- when "0101011" => data_out <= x"e7d40000"; -- stw r10, 0(r8)
- when "0101100" => data_out <= x"ed580018"; -- ldi r11, 0x3
- when "0101101" => data_out <= x"ed5f5802"; -- ldih r11, 0xeb00
- when "0101110" => data_out <= x"e7dc8000"; -- stw r11, 0(r9)
+ when "0000011" => data_out <= x"ed510000"; -- ldi r10, UART_BASE@lo
+ when "0000100" => data_out <= x"ed500002"; -- ldih r10, UART_BASE@hi
+ when "0000101" => data_out <= x"e71d0000"; -- ldw r3, UART_STATUS(r10)
+ when "0000110" => data_out <= x"e2980010"; -- andx r3, UART_RECV_NEW
+ when "0000111" => data_out <= x"1b7fff03"; -- brzs+ poll
+ when "0001000" => data_out <= x"eb000985"; -- call recv_byte
+ when "0001001" => data_out <= x"e4088800"; -- xor r1, r1, r1
+ when "0001010" => data_out <= x"ec800240"; -- cmpi r0, 0x48
+ when "0001011" => data_out <= x"1b001901"; -- breq- bt_H
+ when "0001100" => data_out <= x"eb7ffc81"; -- br poll
+ when "0001101" => data_out <= x"e71d0000"; -- ldw r3, UART_STATUS(r10)
+ when "0001110" => data_out <= x"e2980008"; -- andx r3, UART_TRANS_EMPTY
+ when "0001111" => data_out <= x"0b7fff03"; -- brnz+ send_byte
+ when "0010000" => data_out <= x"e98d0008"; -- stb r1, UART_TRANS(r10)
+ when "0010001" => data_out <= x"eb000008"; -- ret
+ when "0010010" => data_out <= x"e5008008"; -- lrs r0, r1, 0
+ when "0010011" => data_out <= x"eb7ffd05"; -- call send_byte
+ when "0010100" => data_out <= x"e500a008"; -- lrs r0, r1, 8
+ when "0010101" => data_out <= x"eb7ffc05"; -- call send_byte
+ when "0010110" => data_out <= x"e500c008"; -- lrs r0, r1, 16
+ when "0010111" => data_out <= x"eb7ffb05"; -- call send_byte
+ when "0011000" => data_out <= x"e500e008"; -- lrs r0, r1, 24
+ when "0011001" => data_out <= x"eb7ffa05"; -- call send_byte
+ when "0011010" => data_out <= x"eb000008"; -- ret
+ when "0011011" => data_out <= x"e71d0000"; -- ldw r3, UART_STATUS(r10)
+ when "0011100" => data_out <= x"e2980010"; -- andx r3, UART_RECV_NEW
+ when "0011101" => data_out <= x"1b7fff03"; -- brzs+ recv_byte
+ when "0011110" => data_out <= x"e4000000"; -- xor r0, r0, r0
+ when "0011111" => data_out <= x"e905000c"; -- ldb r0, UART_RECV(r10)
+ when "0100000" => data_out <= x"eb000008"; -- ret
+ when "0100001" => data_out <= x"e4000000"; -- xor r0, r0, r0
+ when "0100010" => data_out <= x"e4088800"; -- xor r1, r1, r1
+ when "0100011" => data_out <= x"eb7ffc05"; -- call recv_byte
+ when "0100100" => data_out <= x"e3080800"; -- or r1, r0, r1
+ when "0100101" => data_out <= x"eb7ffb05"; -- call recv_byte
+ when "0100110" => data_out <= x"e508a000"; -- lls r1, r1, 8
+ when "0100111" => data_out <= x"e3080800"; -- or r1, r0, r1
+ when "0101000" => data_out <= x"eb7ff985"; -- call recv_byte
+ when "0101001" => data_out <= x"e508a000"; -- lls r1, r1, 8
+ when "0101010" => data_out <= x"e3080800"; -- or r1, r0, r1
+ when "0101011" => data_out <= x"eb7ff805"; -- call recv_byte
+ when "0101100" => data_out <= x"e508a000"; -- lls r1, r1, 8
+ when "0101101" => data_out <= x"e3080800"; -- or r1, r0, r1
+ when "0101110" => data_out <= x"e1008000"; -- addi r0, r1, 0
+ when "0101111" => data_out <= x"eb000008"; -- ret
+ when "0110000" => data_out <= x"eb001701"; -- br tehend
+ when "0110001" => data_out <= x"eb7ff505"; -- call recv_byte
+ when "0110010" => data_out <= x"e4088800"; -- xor r1, r1, r1
+ when "0110011" => data_out <= x"ec8002b8"; -- cmpi r0, 0x57
+ when "0110100" => data_out <= x"1b000601"; -- breq- bt_W
+ when "0110101" => data_out <= x"ec800290"; -- cmpi r0, 0x52
+ when "0110110" => data_out <= x"1b000881"; -- breq- bt_R
+ when "0110111" => data_out <= x"ec800288"; -- cmpi r0, 0x51
+ when "0111000" => data_out <= x"1b000b01"; -- breq- bt_Q
+ when "0111001" => data_out <= x"ec8002a0"; -- cmpi r0, 0x54
+ when "0111010" => data_out <= x"1b000d81"; -- breq- bt_T
+ when "0111011" => data_out <= x"ec800250"; -- cmpi r0, 0x4a
+ when "0111100" => data_out <= x"1b001001"; -- breq- bt_J
+ when "0111101" => data_out <= x"ed080278"; -- ldi r1, 0x4f
+ when "0111110" => data_out <= x"eb7fe785"; -- call send_byte
+ when "0111111" => data_out <= x"eb000f81"; -- br tehend
+ when "1000000" => data_out <= x"eb7ff085"; -- call recv_word
+ when "1000001" => data_out <= x"e1300000"; -- mov r6, r0
+ when "1000010" => data_out <= x"eb7fef85"; -- call recv_word
+ when "1000011" => data_out <= x"ea830000"; -- stx r0, 0(r6)
+ when "1000100" => data_out <= x"ed080220"; -- ldi r1, 0x44
+ when "1000101" => data_out <= x"eb7fe405"; -- call send_byte
+ when "1000110" => data_out <= x"eb7ff501"; -- br bootrom
+ when "1000111" => data_out <= x"eb7fed05"; -- call recv_word
+ when "1001000" => data_out <= x"e1100000"; -- mov r2, r0
+ when "1001001" => data_out <= x"ed080230"; -- ldi r1, 0x46
+ when "1001010" => data_out <= x"eb7fe185"; -- call send_byte
+ when "1001011" => data_out <= x"ea090000"; -- ldx r1, 0(r2)
+ when "1001100" => data_out <= x"eb7fe305"; -- call send_word
+ when "1001101" => data_out <= x"eb7ff181"; -- br bootrom
+ when "1001110" => data_out <= x"eb7fe985"; -- call recv_word
+ when "1001111" => data_out <= x"e1300000"; -- mov r6, r0
+ when "1010000" => data_out <= x"eb7fe885"; -- call recv_word
+ when "1010001" => data_out <= x"e7830000"; -- stw r0, 0(r6)
+ when "1010010" => data_out <= x"ed080208"; -- ldi r1, 0x41
+ when "1010011" => data_out <= x"eb7fdd05"; -- call send_byte
+ when "1010100" => data_out <= x"eb7fee01"; -- br bootrom
+ when "1010101" => data_out <= x"eb7fe605"; -- call recv_word
+ when "1010110" => data_out <= x"e1100000"; -- mov r2, r0
+ when "1010111" => data_out <= x"ed080238"; -- ldi r1, 0x47
+ when "1011000" => data_out <= x"eb7fda85"; -- call send_byte
+ when "1011001" => data_out <= x"e7090000"; -- ldw r1, 0(r2)
+ when "1011010" => data_out <= x"eb7fdc05"; -- call send_word
+ when "1011011" => data_out <= x"eb7fea81"; -- br bootrom
+ when "1011100" => data_out <= x"eb7fe285"; -- call recv_word
+ when "1011101" => data_out <= x"eb800000"; -- brr r0
-- just nop until rom end!
when others => data_out <= x"fd000000";
end case;