code wiki / (root) / nx_x86.nx

nx_x86.nx

buildroot/runtime/nx_x86.nx

15942 B405 linesdepth 0pulls 0 transitivereach 4 importersview sourcekind librarytopic x86

docs dependencies structs consts functions

about

nx_x86.nx -- Implements a 16-bit real-mode x86 CPU skeleton for running COM-style programs and DOS interrupts.

dependencies 0 imports · 4 importers

imports: none

imported by: nx_x86_dos_gate.nxnx_x86_dosfs_gate.nxnx_x86_gate.nxnx_x86_modrm_gate.nx

structs

none

consts

2	const O_MAGIC_65536: i64 = 65536
3	const O_MAGIC_65535: i64 = 65535
14	const O_MEM: i64 = 0 // 65536 guest bytes (one real-mode segment)
15	const O_REGS: i64 = 65536 // 8 GP regs (i64, hold 16-bit values) -> 65600
16	const O_IP: i64 = 65600
17	const O_ZF: i64 = 65608
18	const O_CF: i64 = 65616
19	const O_SF: i64 = 65624
20	const O_MM: i64 = 65632 // 4-i64 ModR/M decode scratch (reg, is_reg, ea) -- avoids per-step alloc
21	const O_CON: i64 = 65664 // 4096-byte console output buffer (DOS INT 21h writes here)
22	const O_CON_LEN: i64 = 69760 // console length cursor
23	const O_EXIT: i64 = 69768 // set by INT 21h AH=4Ch (program terminate)
24	const O_FSNAME: i64 = 69776 // Nishi-DOS sovereign FS: one file's name (ASCIIZ)
25	const O_FSLEN: i64 = 69792 // its byte length
26	const O_FSDATA: i64 = 69800 // its bytes (up to 4096)
27	const O_HOPEN: i64 = 73896 // 8 file-handle open flags
28	const O_HPOS: i64 = 73960 // 8 file-handle byte positions

functions

30	func x86_reset(base: i64) -> i64 called by 4: main main main main
49	func x86_load(base: i64, addr: i64, byte: i64) -> i64 called by 5: main main load_ab main main
56	func x86_setzsf(base: i64, res: i64) -> i64 called by 1: x86_step
65	func x86_rd16(base: i64, ea: i64) -> i64 called by 2: x86_peek16 x86_rm_get
69	func x86_wr16(base: i64, ea: i64, v: i64) -> i64 called by 1: x86_rm_set
75	func x86_peek16(base: i64, addr: i64) -> i64 { return x86_rd16(base, addr) } // gate/IO read called by 2: main main calls 1: x86_rd16
79	func x86_modrm(base: i64, ip: i64, mm: *i64) -> i64 called by 1: x86_step
117	func x86_rm_get(base: i64, mm: *i64) -> i64 called by 1: x86_step calls 1: x86_rd16
121	func x86_rm_set(base: i64, mm: *i64, v: i64) -> i64 called by 1: x86_step calls 1: x86_wr16
128	func x86_set_r8(base: i64, r: i64, v: i64) -> i64 called by 1: x86_step
136	func x86_fs_put(base: i64, name: u8, data: u8, len: i64) -> i64 called by 1: main
149	func x86_fs_nameeq(base: i64, off: i64) -> i64 called by 1: x86_dos_int21
164	func x86_dos_int21(base: i64) -> i64 called by 1: x86_step calls 1: x86_fs_nameeq
230	func x86_con_len(base: i64) -> i64 { let c: i64 = (base + O_CON_LEN) as i64; return c[0] } called by 2: main main
231	func x86_con_byte(base: i64, i: i64) -> i64 { let con: u8 = (base + O_CON) as u8; return con[i] as i64 } called by 2: main main
234	func x86_step(base: i64) -> i64 called by 1: x86_run calls 6: x86_setzsf x86_modrm x86_rm_set x86_rm_get x86_set_r8 x86_dos_int21
392	func x86_run(base: i64, cap: i64) -> i64 called by 4: main main main main calls 1: x86_step
401	func x86_reg(base: i64, r: i64) -> i64 { let regs: i64 = (base + O_REGS) as i64; return regs[r & 7] } called by 3: main main main
402	func x86_ip(base: i64) -> i64 { let ipp: i64 = (base + O_IP) as i64; return ipp[0] }
403	func x86_zf(base: i64) -> i64 { let z: i64 = (base + O_ZF) as i64; return z[0] } called by 1: main
404	func x86_cf(base: i64) -> i64 { let c: i64 = (base + O_CF) as i64; return c[0] }
405	func x86_sf(base: i64) -> i64 { let s: i64 = (base + O_SF) as i64; return s[0] }