collapseos/blk/753

: OP1 CREATE C, DOES> C@ A, ;
0xac OP1 LODSB,      0xfa OP1 CLI,       0xfb OP1 STI,
0xf4 OP1 HLT,        0xfc OP1 CLD,       0xfd OP1 STD,
( no argument, jumps with relative addrs are special )
0xeb OP1 JMPs,       0xe9 OP1 JMPn,      0x74 OP1 JZ,
                     0xe8 OP1 CALLn,
: MOVri, SWAP 0xb0 OR A, A, ;
: MOVxi, SWAP 0xb8 OR A, SPLITB A, A, ;
: MOVsx, 0x8e A, SWAP 3 LSHIFT OR 0xc0 OR A, ;
: INT, 0xcd A, A, ;
: JMPr, 0xff A, 7 AND 0xe0 OR A, ;
: JMPf, ( seg off ) 0xea A, SPLITB A, A, SPLITB A, A, ;
: OPrr CREATE C, DOES> C@ A, 3 LSHIFT OR 0xc0 OR A, ;
0x31 OPrr XORxx,     0x08 OPrr ORrr,
8086asm: tidy up a bit 2020-06-14 06:21:56 +10:00			`: OP1 CREATE C, DOES> C@ A, ;`
			`0xac OP1 LODSB, 0xfa OP1 CLI, 0xfb OP1 STI,`
			`0xf4 OP1 HLT, 0xfc OP1 CLD, 0xfd OP1 STD,`
pcat: use a far jump to boot into the OS Unless I misunderstood, this is supposed to set CS. This would make all SREG have the same value. This allows us to remove BIN( offset from os.bin. I've tried booting to offset 0, but it didn't seem to work. Let's settle for 0x8000. 512kb of system RAM is way more than we need anyways. 2020-06-14 10:06:51 +10:00			`( no argument, jumps with relative addrs are special )`
8086asm: tidy up a bit 2020-06-14 06:21:56 +10:00			`0xeb OP1 JMPs, 0xe9 OP1 JMPn, 0x74 OP1 JZ,`
pcat: begin structuring around words 2020-06-15 04:15:44 +10:00			`0xe8 OP1 CALLn,`
8086asm: first steps 2020-06-13 00:49:27 +10:00			`: MOVri, SWAP 0xb0 OR A, A, ;`
8086asm: clarify operands and fix stupidities 2020-06-14 07:58:42 +10:00			`: MOVxi, SWAP 0xb8 OR A, SPLITB A, A, ;`
			`: MOVsx, 0x8e A, SWAP 3 LSHIFT OR 0xc0 OR A, ;`
8086asm: add 8-bit JMP, MOVrI, INT, Verified against nasm with equivalent code. 2020-06-13 01:29:00 +10:00			`: INT, 0xcd A, A, ;`
pcat: separate MBR code and OS code MBR code now strictly loads OS code into memory and jumps into it. Now, I've got to consolidate my assembler code, modrm logic is messed up. 2020-06-14 05:35:16 +10:00			`: JMPr, 0xff A, 7 AND 0xe0 OR A, ;`
pcat: use a far jump to boot into the OS Unless I misunderstood, this is supposed to set CS. This would make all SREG have the same value. This allows us to remove BIN( offset from os.bin. I've tried booting to offset 0, but it didn't seem to work. Let's settle for 0x8000. 512kb of system RAM is way more than we need anyways. 2020-06-14 10:06:51 +10:00			`: JMPf, ( seg off ) 0xea A, SPLITB A, A, SPLITB A, A, ;`
8086asm: clarify operands and fix stupidities 2020-06-14 07:58:42 +10:00			`: OPrr CREATE C, DOES> C@ A, 3 LSHIFT OR 0xc0 OR A, ;`
			`0x31 OPrr XORxx, 0x08 OPrr ORrr,`