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TRDOS 386 Kernel v2.0.0 - 31/12/2017
6
TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0
1 ; ****************************************************************************
2 ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0
3 ; ----------------------------------------------------------------------------
4 ; Last Update: 31/12/2017
5 ; ----------------------------------------------------------------------------
6 ; Beginning: 04/01/2016
7 ; ----------------------------------------------------------------------------
8 ; Assembler: NASM version 2.11 (trdos386.s)
9 ; ----------------------------------------------------------------------------
10 ; Turkish Rational DOS
11 ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
12 ;
13 ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
14 ; unix386.s (03/01/2016)
15 ;
16 ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
17 ; TRDOS2.ASM (09/11/2011)
18 ;
19 ; Derived from 'IBM PC-XT-286' BIOS source code (1986)
20 ; ****************************************************************************
21 ; nasm trdos386.s -l trdos386.txt -o TRDOS386.SYS
22
23
24 KLOADequ 10000h ; Kernel loading address
25 ; NOTE: Retro UNIX 8086 v1 /boot code loads kernel at 1000h:0000h
26 KCODEequ 08h; Code segment descriptor (ring 0)
27 KDATAequ 10h; Data segment descriptor (ring 0)
28 ; 19/03/2015
29 UCODEequ 1Bh ; 18h + 3h (ring 3)
30 UDATAequ 23h ; 20h + 3h (ring 3)
31 ; 24/03/2015
32 TSSequ 28h; Task state segment descriptor (ring 0)
33 ; 19/03/2015
34 COREequ 400000h ; Start of USER's virtual/linear address space
35 ; (at the end of the 1st 4MB)
36 ECOREequ 0FFC00000h ; End of USER's virtual address space (4GB - 4MB)
37 ; ULIMIT = (ECORE/4096) - 1 = 0FFBFFh (in GDT)
38
39 ;; 27/12/2013
40 ;KEND equ KLOAD + 65536 ; (28/12/2013) (end of kernel space)
41 ; 04/07/2016
42 KEND equ KERNELFSIZE + KLOAD
43
44
45 ; IBM PC/AT BIOS ----- 10/06/85 (postequ.inc)
46 ;--------- CMOS TABLE LOCATION ADDRESS'S -------------------------------------
47 CMOS_SECONDSEQU00H; SECONDS (BCD)
48 CMOS_SEC_ALARMEQU01H; SECONDS ALARM (BCD)
49 CMOS_MINUTESEQU02H; MINUTES (BCD)
50 CMOS_MIN_ALARMEQU03H; MINUTES ALARM (BCD)
51 CMOS_HOURSEQU04H; HOURS (BCD
52 CMOS_HR_ALARMEQU005H; HOURS ALARM (BCD)
53 CMOS_DAY_WEEKEQU06H; DAY OF THE WEEK (BCD)
54 CMOS_DAY_MONTHEQU07H; DAY OF THE MONTH (BCD)
55 CMOS_MONTHEQU08H; MONTH (BCD)
56 CMOS_YEAREQU09H; YEAR (TWO DIGITS) (BCD)
57 CMOS_CENTURYEQU32H; DATE CENTURY BYTE (BCD)
58 CMOS_REG_AEQU0AH; STATUS REGISTER A
59 CMOS_REG_BEQU00BH; STATUS REGISTER B ALARM
60 CMOS_REG_CEQU00CH; STATUS REGISTER C FLAGS
61 CMOS_REG_DEQU0DH; STATUS REGISTER D BATTERY
62 CMOS_SHUT_DOWNEQU0FH; SHUTDOWN STATUS COMMAND BYTE
63 ;----------------------------------------
64 ;CMOS EQUATES FOR THIS SYSTEM;
65 ;-----------------------------------------------------------------------------
66 CMOS_PORTEQU070H; I/O ADDRESS OF CMOS ADDRESS PORT
67 CMOS_DATAEQU071H; I/O ADDRESS OF CMOS DATA PORT
68 NMIEQU10000000B; DISABLE NMI INTERRUPTS MASK -
69 ; HIGH BIT OF CMOS LOCATION ADDRESS
70
71 ; Memory Allocation Table Address
72 ; 05/11/2014
73 ; 31/10/2014
74 MEM_ALLOC_TBLequ100000h; Memory Allocation Table at the end of
75 ; the 1st 1 MB memory space.
76 ; (This address must be aligned
77 ; on 128 KB boundary, if it will be
78 ; changed later.)
79 ; ((lower 17 bits of 32 bit M.A.T.
80 ; address must be ZERO)).
81 ; ((((Reason: 32 bit allocation
82 ; instructions, dword steps)))
83 ; (((byte >> 12 --> page >> 5)))
84 ;04/11/2014
85 PDE_A_PRESENTequ1; Present flag for PDE
86 PDE_A_WRITEequ 2; Writable (write permission) flag
87 PDE_A_USERequ4; User (non-system/kernel) page flag
88 ;
89 PTE_A_PRESENTequ1; Present flag for PTE (bit 0)
90 PTE_A_WRITEequ 2; Writable (write permission) flag (bit 1)
91 PTE_A_USERequ4; User (non-system/kernel) page flag (bit 2)
92 PTE_A_ACCESS equ32; Accessed flag (bit 5) ; 09/03/2015
93
94 ; 17/02/2015 (unix386.s)
95 ; 10/12/2014 - 30/12/2014 (0B000h -> 9000h) (dsectrm2.s)
96 DPT_SEGM equ 09000h ; FDPT segment (EDD v1.1, EDD v3)
97 ;
98 HD0_DPT equ 0 ; Disk parameter table address for hd0
99 HD1_DPT equ 32 ; Disk parameter table address for hd1
100 HD2_DPT equ 64 ; Disk parameter table address for hd2
101 HD3_DPT equ 96 ; Disk parameter table address for hd3
102
103
104 ; FDPT (Phoenix, Enhanced Disk Drive Specification v1.1, v3.0)
105 ; (HDPT: Programmer's Guide to the AMIBIOS, 1993)
106 ;
107 FDPT_CYLSequ 0 ; 1 word, number of cylinders
108 FDPT_HDSequ 2 ; 1 byte, number of heads
109 FDPT_TTequ 3 ; 1 byte, A0h = translated FDPT with logical values
110 ; otherwise it is standard FDPT with physical values
111 FDPT_PCMPequ 5 ; 1 word, starting write precompensation cylinder
112 ; (obsolete for IDE/ATA drives)
113 FDPT_CBequ 8 ; 1 byte, drive control byte
114 ; Bits 7-6 : Enable or disable retries (00h = enable)
115 ; Bit 5: 1 = Defect map is located at last cyl. + 1
116 ; Bit 4 : Reserved. Always 0
117 ; Bit 3 : Set to 1 if more than 8 heads
118 ; Bit 2-0 : Reserved. Alsways 0
119 FDPT_LZequ 12 ; 1 word, landing zone (obsolete for IDE/ATA drives)
120 FDPT_SPTequ 14 ; 1 byte, sectors per track
121
122 ; Floppy Drive Parameters Table (Programmer's Guide to the AMIBIOS, 1993)
123 ; (11 bytes long) will be used by diskette handler/bios
124 ; which is derived from IBM PC-AT BIOS (DISKETTE.ASM, 21/04/1986).
125
126 ; 01/02/2016
127 Logical_DOSDisks equ 90000h + 100h ; 26*256 = 6656 bytes
128 Directory_Buffer equ 80000h ; max = 64K Bytes
129 FAT_Buffer equ 91C00h ; 1536 bytes (3 sectors)
130 ; 15/02/2016
131 Cluster_Buffer equ 70000h ; max = 64K Bytes ; buffer for file read & write
132 ; 11/04/2016
133 Env_Page: equ 93000h ; 512 bytes (4096 bytes)
134 Env_Page_Size equ 512 ; (4096 bytes)
135 ; 30/07/2016
136 Video_Pg_Backup equ 98000h ; Mode 3h, video page backup (32K, 8 pages)
137
138 [BITS 16] ; We need 16-bit intructions for Real mode
139
140 [ORG 0]
141 ; 12/11/2014
142 ; Save boot drive number (that is default root drive)
143 00000000 8816[F25C] mov[boot_drv], dl ; physical drv number
144
145 ; Determine installed memory
146 ; 31/10/2014
147 ;
148 00000004 B801E8 movax, 0E801h ; Get memory size
149 00000007 CD15 int15h ; for large configurations
150 00000009 7308 jncshort chk_ms
151 0000000B B488 movah, 88h ; Get extended memory size
152 0000000D CD15 int15h
153 ;
154 ;moval, 17h; Extended memory (1K blocks) low byte
155 ;out70h, al ; select CMOS register
156 ;inal, 71h ; read data (1 byte)
157 ;movcl, al
158 ;moval, 18h ; Extended memory (1K blocks) high byte
159 ;out70h, al ; select CMOS register
160 ;inal, 71h ; read data (1 byte)
161 ;movch, al
162 ;
163 0000000F 89C1 movcx, ax
164 00000011 31D2 xordx, dx
165 chk_ms:
166 00000013 890E[EE5C] mov[mem_1m_1k], cx
167 00000017 8916[F05C] mov[mem_16m_64k], dx
168 ; 05/11/2014
169 ;anddx, dx
170 ;jzshort L2
171 0000001B 81F90004 cmp cx, 1024
172 0000001F 7351 jnbshort L0
173 ; insufficient memory_error
174 ; Minimum 2 MB memory is needed...
175 ; 05/11/2014
176 ; (real mode error printing)
177 00000021 FB sti
178 00000022 BE[3600] movsi, msg_out_of_memory
179 00000025 BB0700 movbx, 7
180 00000028 B40E movah, 0Eh; write tty
181 oom_1:
182 0000002A AC lodsb
183 0000002B 08C0 oral, al
184 0000002D 7404 jzshort oom_2
185 0000002F CD10 int10h
186 00000031 EBF7 jmpshort oom_1
187 oom_2:
188 00000033 F4 hlt
189 00000034 EBFD jmpshort oom_2
190
191 ; 20/02/2017
192 ; 05/11/2014
193 msg_out_of_memory:
194 00000036 070D0A db 07h, 0Dh, 0Ah
195 00000039 496E73756666696369- db 'Insufficient memory !'
195 00000042 656E74206D656D6F72-
195 0000004B 792021
196 0000004E 0D0A db0Dh, 0Ah
197 _int13h_48h_buffer: ; 07/07/2016
198 00000050 284D696E696D756D20- db'(Minimum 2MB memory is needed.)'
198 00000059 324D42206D656D6F72-
198 00000062 79206973206E656564-
198 0000006B 65642E29
199 0000006F 0D0A00 db0Dh, 0Ah, 0
200 ;
201
202 L0:
203 %include 'diskinit.s' ; 07/03/2015
1 <1> ; ****************************************************************************
2 <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskinit.s
3 <1> ; ----------------------------------------------------------------------------
4 <1> ; Last Update: 09/07/2016
5 <1> ; ----------------------------------------------------------------------------
6 <1> ; Beginning: 24/01/2016
7 <1> ; ----------------------------------------------------------------------------
8 <1> ; Assembler: NASM version 2.11 (trdos386.s)
9 <1> ; ----------------------------------------------------------------------------
10 <1> ; Turkish Rational DOS
11 <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
12 <1> ;
13 <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
14 <1> ; diskinit.inc (10/07/2015)
15 <1> ;
16 <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986)
17 <1> ; ****************************************************************************
18 <1>
19 <1> ; Retro UNIX 386 v1 Kernel - DISKINIT.INC
20 <1> ; Last Modification: 10/07/2015
21 <1>
22 <1> ; DISK I/O SYSTEM INITIALIZATION - Erdogan Tan (Retro UNIX 386 v1 project)
23 <1>
24 <1> ; ///////// DISK I/O SYSTEM STRUCTURE INITIALIZATION ///////////////
25 <1>
26 <1> ; 10/12/2014 - 02/02/2015 - dsectrm2.s
27 <1> ;L0:
28 <1> ; 12/11/2014 (Retro UNIX 386 v1 - beginning)
29 <1> ; Detecting disk drives... (by help of ROM-BIOS)
30 00000072 BA7F00 <1> movdx, 7Fh
31 <1> L1:
32 00000075 FEC2 <1> incdl
33 00000077 B441 <1> movah, 41h ; Check extensions present
34 <1> ; Phoenix EDD v1.1 - EDD v3
35 00000079 BBAA55 <1> movbx, 55AAh
36 0000007C CD13 <1> int 13h
37 0000007E 721A <1> jcshort L2
38 <1>
39 00000080 81FB55AA <1> cmpbx, 0AA55h
40 00000084 7514 <1> jneshort L2
41 00000086 FE06[F55C] <1> incbyte [hdc]; count of hard disks (EDD present)
42 0000008A 8816[F45C] <1> mov [last_drv], dl ; last hard disk number
43 0000008E BB[785C] <1> movbx, hd0_type - 80h
44 00000091 01D3 <1> addbx, dx
45 00000093 880F <1> mov[bx], cl ; Interface support bit map in CX
46 <1> ; Bit 0 - 1, Fixed disk access subset ready
47 <1> ; Bit 1 - 1, Drv locking and ejecting ready
48 <1> ; Bit 2 - 1, Enhanced Disk Drive Support
49 <1> ; (EDD) ready (DPTE ready)
50 <1> ; Bit 3 - 1, 64bit extensions are present
51 <1> ; (EDD-3)
52 <1> ; Bit 4 to 15 - 0, Reserved
53 00000095 80FA83 <1> cmpdl, 83h ; drive number < 83h
54 00000098 72DB <1> jbshort L1
55 <1> L2:
56 <1> ; 23/11/2014
57 <1> ; 19/11/2014
58 0000009A 30D2 <1> xordl, dl ; 0
59 <1> ; 04/02/2016 (esi -> si)
60 0000009C BE[F65C] <1> movsi, fd0_type
61 <1> L3:
62 <1> ; 14/01/2015
63 0000009F 8816[F35C] <1> mov[drv], dl
64 <1> ;
65 000000A3 B408 <1> mov ah, 08h ; Return drive parameters
66 000000A5 CD13 <1> int13h
67 000000A7 7210 <1> jcshort L4
68 <1> ; BL = drive type (for floppy drives)
69 <1> ; DL = number of floppy drives
70 <1> ;
71 <1> ; ES:DI = Address of DPT from BIOS
72 <1> ;
73 000000A9 881C <1> mov[si], bl ; Drive type
74 <1> ; 4 = 1.44 MB, 80 track, 3 1/2"
75 <1> ; 14/01/2015
76 000000AB E8BC01 <1> callset_disk_parms
77 <1> ; 10/12/2014
78 000000AE 81FE[F65C] <1> cmpsi, fd0_type
79 000000B2 7705 <1> jashort L4
80 000000B4 46 <1> incsi ; fd1_type
81 000000B5 B201 <1> movdl, 1
82 000000B7 EBE6 <1> jmpshort L3
83 <1> L4:
84 <1> ; Older BIOS (INT 13h, AH = 48h is not available)
85 000000B9 B27F <1> movdl, 7Fh
86 <1> ; 24/12/2014 (Temporary)
87 000000BB 803E[F55C]00 <1> cmpbyte [hdc], 0 ; EDD present or not ?
88 000000C0 0F879000 <1> ja L10 ; yes, all fixed disk operations
89 <1> ; will be performed according to
90 <1> ; present EDD specification
91 <1> L6:
92 000000C4 FEC2 <1> inc dl
93 000000C6 8816[F35C] <1> mov [drv], dl
94 000000CA 8816[F45C] <1> mov [last_drv], dl ; 14/01/2015
95 000000CE B408 <1> mov ah, 08h ; Return drive parameters
96 000000D0 CD13 <1> int13h; (conventional function)
97 000000D2 0F828601 <1> jc L13; fixed disk drive not ready
98 000000D6 8816[F55C] <1> mov [hdc], dl ; number of drives
99 <1> ;; 14/01/2013
100 <1> ;;pushcx
101 000000DA E88D01 <1> callset_disk_parms
102 <1> ;;popcx
103 <1> ;
104 <1> ;;andcl, 3Fh ; sectors per track (bits 0-6)
105 000000DD 8A16[F35C] <1> mov dl, [drv]
106 000000E1 BB0401 <1> movbx, 65*4 ; hd0 parameters table (INT 41h)
107 000000E4 80FA80 <1> cmpdl, 80h
108 000000E7 7603 <1> jnashort L7
109 000000E9 83C314 <1> addbx, 5*4 ; hd1 parameters table (INT 46h)
110 <1> L7:
111 000000EC 31C0 <1> xorax, ax
112 000000EE 8ED8 <1> movds, ax
113 000000F0 8B37 <1> mov si, [bx]
114 000000F2 8B4702 <1> mov ax, [bx+2]
115 000000F5 8ED8 <1> movds, ax
116 000000F7 3A4C0E <1> cmp cl, [si+FDPT_SPT] ; sectors per track
117 000000FA 0F855A01 <1> jne L12 ; invalid FDPT
118 000000FE BF0000 <1> movdi, HD0_DPT
119 00000101 80FA80 <1> cmpdl, 80h
120 00000104 7603 <1> jnashort L8
121 00000106 BF2000 <1> movdi, HD1_DPT
122 <1> L8:
123 <1> ; 30/12/2014
124 00000109 B80090 <1> movax, DPT_SEGM
125 0000010C 8EC0 <1> moves, ax
126 <1> ; 24/12/2014
127 0000010E B90800 <1> movcx, 8
128 00000111 F3A5 <1> repmovsw ; copy 16 bytes to the kernel's DPT location
129 00000113 8CC8 <1> movax, cs
130 00000115 8ED8 <1> movds, ax
131 <1> ; 02/02/2015
132 00000117 8A0E[F35C] <1> mov cl, [drv]
133 0000011B 88CB <1> movbl, cl
134 0000011D B8F001 <1> movax, 1F0h
135 00000120 80E301 <1> andbl, 1
136 00000123 7406 <1> jzshort L9
137 00000125 C0E304 <1> shlbl, 4
138 00000128 2D8000 <1> subax, 1F0h-170h
139 <1> L9:
140 0000012B AB <1> stosw; I/O PORT Base Address (1F0h, 170h)
141 0000012C 050602 <1> addax, 206h
142 0000012F AB <1> stosw; CONTROL PORT Address (3F6h, 376h)
143 00000130 88D8 <1> moval, bl
144 00000132 04A0 <1> addal, 0A0h
145 00000134 AA <1> stosb; Device/Head Register upper nibble
146 <1> ;
147 00000135 FE06[F35C] <1> incbyte [drv]
148 00000139 BB[785C] <1> movbx, hd0_type - 80h
149 0000013C 01CB <1> addbx, cx
150 0000013E 800F80 <1> or byte [bx], 80h ; present sign (when lower nibble is 0)
151 00000141 A0[F55C] <1> moval, [hdc]
152 00000144 FEC8 <1> decal
153 00000146 0F841201 <1> jz L13
154 0000014A 80FA80 <1> cmpdl, 80h
155 0000014D 0F8673FF <1> jna L6
156 00000151 E90801 <1> jmp L13
157 <1> L10:
158 00000154 FEC2 <1> inc dl
159 <1> ; 25/12/2014
160 00000156 8816[F35C] <1> mov[drv], dl
161 0000015A B408 <1> mov ah, 08h ; Return drive parameters
162 0000015C CD13 <1> int13h; (conventional function)
163 0000015E 0F82FA00 <1> jc L13
164 <1> ; 14/01/2015
165 00000162 8A16[F35C] <1> movdl, [drv]
166 00000166 52 <1> pushdx
167 00000167 51 <1> pushcx
168 00000168 E8FF00 <1> callset_disk_parms
169 0000016B 59 <1> popcx
170 0000016C 5A <1> popdx
171 <1> ; 06/07/2016 (BugFix for >64K kernel files)
172 <1> ; 04/02/2016 (esi -> si)
173 <1> ;movsi, _end ; 30 byte temporary buffer address
174 <1> ; ; at the '_end' of kernel.
175 <1> ;movword [si], 30
176 <1> ; 06/07/2016
177 0000016D BE[5000] <1> movsi, _int13h_48h_buffer
178 <1> ; 09/07/2016
179 00000170 B81E00 <1> movax, 001Eh
180 00000173 8824 <1> mov[si], ah ; 0
181 00000175 46 <1> incsi
182 00000176 8904 <1> movword [si], ax
183 <1> ; word [si] = 30
184 <1> ;
185 00000178 B448 <1> movah, 48h ; Get drive parameters (EDD function)
186 0000017A CD13 <1> int13h
187 0000017C 0F82DC00 <1> jc L13
188 <1> ; 04/02/2016 (ebx -> bx)
189 <1> ; 14/01/2015
190 00000180 28FF <1> subbh, bh
191 00000182 88D3 <1> movbl, dl
192 00000184 80EB80 <1> subbl, 80h
193 00000187 81C3[F85C] <1> addbx, hd0_type
194 0000018B 8A07 <1> mov al, [bx]
195 0000018D 0C80 <1> oral, 80h
196 0000018F 8807 <1> mov [bx], al
197 00000191 81EB[F65C] <1> subbx, hd0_type - 2 ; 15/01/2015
198 00000195 81C3[425D] <1> addbx, drv.status
199 00000199 8807 <1> mov[bx], al
200 <1> ; 04/02/2016 (eax -> ax)
201 0000019B 8B4410 <1> movax, [si+16]
202 0000019E 854412 <1> testax, [si+18]
203 000001A1 7412 <1> jzshort L10_A0h
204 <1> ; 'CHS only' disks on EDD system
205 <1> ; are reported with ZERO disk size
206 000001A3 81EB[425D] <1> subbx, drv.status
207 000001A7 C1E302 <1> shlbx, 2
208 000001AA 81C3[265D] <1> addbx, drv.size ; disk size (in sectors)
209 000001AE 8907 <1> mov[bx], ax
210 000001B0 8B4412 <1> movax, [si+18]
211 000001B3 8907 <1> mov[bx], ax
212 <1>
213 <1> L10_A0h: ; Jump here to fix a ZERO (LBA) disk size problem
214 <1> ; for CHS disks (28/02/2015)
215 <1> ; 30/12/2014
216 000001B5 BF0000 <1> movdi, HD0_DPT
217 000001B8 88D0 <1> moval, dl
218 000001BA 83E003 <1> and ax, 3
219 000001BD C0E005 <1> shlal, 5 ; *32
220 000001C0 01C7 <1> add di, ax
221 000001C2 B80090 <1> movax, DPT_SEGM
222 000001C5 8EC0 <1> moves, ax
223 <1> ;
224 000001C7 88E8 <1> moval, ch; max. cylinder number (bits 0-7)
225 000001C9 88CC <1> movah, cl
226 000001CB C0EC06 <1> shrah, 6; max. cylinder number (bits 8-9)
227 000001CE 40 <1> incax; logical cylinders (limit 1024)
228 000001CF AB <1> stosw
229 000001D0 88F0 <1> moval, dh; max. head number
230 000001D2 FEC0 <1> incal
231 000001D4 AA <1> stosb; logical heads (limits 256)
232 000001D5 B0A0 <1> moval, 0A0h ; Indicates translated table
233 000001D7 AA <1> stosb
234 000001D8 8A440C <1> moval, [si+12]
235 000001DB AA <1> stosb ; physical sectors per track
236 000001DC 31C0 <1> xorax, ax
237 <1> ;decax ; 02/01/2015
238 000001DE AB <1> stosw ; precompensation (obsolete)
239 <1> ;xoral, al ; 02/01/2015
240 000001DF AA <1> stosb ; reserved
241 000001E0 B008 <1> moval, 8 ; drive control byte
242 <1> ; (do not disable retries,
243 <1> ; more than 8 heads)
244 000001E2 AA <1> stosb
245 000001E3 8B4404 <1> movax, [si+4]
246 000001E6 AB <1> stosw ; physical number of cylinders
247 <1> ;pushax ; 02/01/2015
248 000001E7 8A4408 <1> moval, [si+8]
249 000001EA AA <1> stosb ; physical num. of heads (limit 16)
250 000001EB 29C0 <1> sub ax, ax
251 <1> ;popax ; 02/01/2015
252 000001ED AB <1> stosw ; landing zone (obsolete)
253 000001EE 88C8 <1> moval, cl ; logical sectors per track (limit 63)
254 000001F0 243F <1> and al, 3Fh
255 000001F2 AA <1> stosb
256 <1> ;subal, al ; checksum
257 <1> ;stosb
258 <1> ;
259 000001F3 83C61A <1> addsi, 26 ; (BIOS) DPTE address pointer
260 000001F6 AD <1> lodsw
261 000001F7 50 <1> pushax ; (BIOS) DPTE offset
262 000001F8 AD <1> lodsw
263 000001F9 50 <1> pushax ; (BIOS) DPTE segment
264 <1> ;
265 <1> ; checksum calculation
266 000001FA 89FE <1> movsi, di
267 000001FC 06 <1> pushes
268 000001FD 1F <1> popds
269 <1> ;movcx, 16
270 000001FE B90F00 <1> mov cx, 15
271 00000201 29CE <1> subsi, cx
272 00000203 30E4 <1> xorah, ah
273 <1> ;delcl
274 <1> L11:
275 00000205 AC <1> lodsb
276 00000206 00C4 <1> addah, al
277 00000208 E2FB <1> loopL11
278 <1> ;
279 0000020A 88E0 <1> moval, ah
280 0000020C F6D8 <1> negal; -x+x = 0
281 0000020E AA <1> stosb; put checksum in byte 15 of the tbl
282 <1> ;
283 0000020F 1F <1> popds; (BIOS) DPTE segment
284 00000210 5E <1> popsi; (BIOS) DPTE offset
285 <1> ;
286 <1> ; 23/02/2015
287 00000211 57 <1> pushdi
288 <1> ; ES:DI points to DPTE (FDPTE) location
289 <1> ;movcx, 8
290 00000212 B108 <1> movcl, 8
291 00000214 F3A5 <1> repmovsw
292 <1> ;
293 <1> ; 23/02/2015
294 <1> ; (P)ATA drive and LBA validation
295 <1> ; (invalidating SATA drives and setting
296 <1> ; CHS type I/O for old type fixed disks)
297 00000216 5B <1> popbx
298 00000217 8CC8 <1> movax, cs
299 00000219 8ED8 <1> movds, ax
300 0000021B 268B07 <1> movax, [es:bx]
301 0000021E 3DF001 <1> cmpax, 1F0h
302 00000221 7418 <1> jeshort L11a
303 00000223 3D7001 <1> cmpax, 170h
304 00000226 7413 <1> jeshort L11a
305 <1> ; invalidation
306 <1> ; (because base port address is not 1F0h or 170h)
307 00000228 30FF <1> xorbh, bh
308 0000022A 88D3 <1> movbl, dl
309 0000022C 80EB80 <1> subbl, 80h
310 0000022F C687[F85C]00 <1> movbyte [bx+hd0_type], 0 ; not a valid disk drive !
311 00000234 808F[445D]F0 <1> or byte [bx+drv.status+2], 0F0h ; (failure sign)
312 00000239 EB14 <1> jmpshort L11b
313 <1> L11a:
314 <1> ; LBA validation
315 0000023B 268A4704 <1> moval, [es:bx+4] ; Head register upper nibble
316 0000023F A840 <1> testal, 40h ; LBA bit (bit 6)
317 00000241 750C <1> jnzshort L11b ; LBA type I/O is OK! (E0h or F0h)
318 <1> ; force CHS type I/O for this drive (A0h or B0h)
319 00000243 28FF <1> subbh, bh
320 00000245 88D3 <1> movbl, dl
321 00000247 80EB80 <1> subbl, 80h ; 26/02/2015
322 0000024A 80A7[445D]FE <1> and byte [bx+drv.status+2], 0FEh ; clear bit 0
323 <1> ; bit 0 = LBA ready bit
324 <1> ; 'diskio' procedure will check this bit !
325 <1> L11b:
326 0000024F 3A16[F45C] <1> cmpdl, [last_drv] ; 25/12/2014
327 00000253 7307 <1> jnb short L13
328 00000255 E9FCFE <1> jmp L10
329 <1> L12:
330 <1> ; Restore data registers
331 00000258 8CC8 <1> movax, cs
332 0000025A 8ED8 <1> movds, ax
333 <1> L13:
334 <1> ; 13/12/2014
335 0000025C 0E <1> pushcs
336 0000025D 07 <1> popes
337 <1> L14:
338 0000025E B411 <1> mov ah, 11h
339 00000260 CD16 <1> int 16h
340 00000262 7466 <1> jz short L16 ; no keys in keyboard buffer
341 00000264 B010 <1> moval, 10h
342 00000266 CD16 <1> int 16h
343 00000268 EBF4 <1> jmp short L14
344 <1>
345 <1> set_disk_parms:
346 <1> ; 04/02/2016 (ebx -> bx)
347 <1> ; 10/07/2015
348 <1> ; 14/01/2015
349 <1> ;pushbx
350 0000026A 28FF <1> subbh, bh
351 0000026C 8A1E[F35C] <1> movbl, [drv]
352 00000270 80FB80 <1> cmpbl, 80h
353 00000273 7203 <1> jbshort sdp0
354 00000275 80EB7E <1> subbl, 7Eh
355 <1> sdp0:
356 00000278 81C3[425D] <1> addbx, drv.status
357 0000027C C60780 <1> movbyte [bx], 80h ; 'Present' flag
358 <1> ;
359 0000027F 88E8 <1> moval, ch ; last cylinder (bits 0-7)
360 00000281 88CC <1> movah, cl ;
361 00000283 C0EC06 <1> shrah, 6 ; last cylinder (bits 8-9)
362 00000286 81EB[425D] <1> subbx, drv.status
363 0000028A D0E3 <1> shlbl, 1
364 0000028C 81C3[FC5C] <1> addbx, drv.cylinders
365 00000290 40 <1> incax ; convert max. cyl number to cyl count
366 00000291 8907 <1> mov[bx], ax
367 00000293 50 <1> pushax ; ** cylinders
368 00000294 81EB[FC5C] <1> subbx, drv.cylinders
369 00000298 81C3[0A5D] <1> addbx, drv.heads
370 0000029C 30E4 <1> xorah, ah
371 0000029E 88F0 <1> moval, dh ; heads
372 000002A0 40 <1> incax
373 000002A1 8907 <1> mov[bx], ax
374 000002A3 81EB[0A5D] <1> sub bx, drv.heads
375 000002A7 81C3[185D] <1> add bx, drv.spt
376 000002AB 30ED <1> xorch, ch
377 000002AD 80E13F <1> andcl, 3Fh; sectors (bits 0-6)
378 000002B0 890F <1> mov[bx], cx
379 000002B2 81EB[185D] <1> sub bx, drv.spt
380 000002B6 D1E3 <1> shlbx, 1
381 000002B8 81C3[265D] <1> addbx, drv.size ; disk size (in sectors)
382 <1> ; LBA size = cylinders * heads * secpertrack
383 000002BC F7E1 <1> mulcx
384 000002BE 89C2 <1> movdx, ax; heads*spt
385 000002C0 58 <1> popax ; ** cylinders
386 000002C1 48 <1> decax ; 1 cylinder reserved (!?)
387 000002C2 F7E2 <1> muldx ; cylinders * (heads*spt)
388 000002C4 8907 <1> mov[bx], ax
389 000002C6 895702 <1> mov[bx+2], dx
390 <1> ;
391 <1> ;popbx
392 000002C9 C3 <1> retn
393 <1>
394 <1> L16:; 28/05/2016
204
205 ; 10/11/2014
206 000002CA FA cli; Disable interrupts (clear interrupt flag)
207 ; Reset Interrupt MASK Registers (Master&Slave)
208 ;moval, 0FFh; mask off all interrupts
209 ;out21h, al; on master PIC (8259)
210 ;jmp $+2 ; (delay)
211 ;out0A1h, al; on slave PIC (8259)
212 ;
213 ; Disable NMI
214 000002CB B080 mov al, 80h
215 000002CD E670 out 70h, al; set bit 7 to 1 for disabling NMI
216 ;23/02/2015
217 ;nop;
218 ;inal, 71h; read in 71h just after writing out to 70h
219 ; for preventing unknown state (!?)
220 ;
221 ; 20/08/2014
222 ; Moving the kernel 64 KB back (to physical address 0)
223 ; DS = CS = 1000h
224 ; 05/11/2014
225 000002CF 31C0 xorax, ax
226 000002D1 8EC0 moves, ax ; ES = 0
227 ;
228 ; 04/07/2016 - TRDOS 386 (64K - 128K kernel)
229 000002D3 31F6 xorsi, si
230 000002D5 31FF xordi, di
231 000002D7 B90040 movcx, 16384
232 000002DA F366A5 repmovsd
233 ;
234 000002DD 06 pushes ; 0
235 000002DE 68[E202] pushL17
236 000002E1 CB retf
237 L17:
238 000002E2 B90010 movcx, 1000h
239 000002E5 8EC1 moves, cx ; 1000h
240 000002E7 01C9 addcx, cx
241 000002E9 8ED9 movds, cx ; 2000h
242 000002EB 29F6 subsi, si
243 000002ED 29FF subdi, di
244 000002EF B90040 movcx, 16384
245 000002F2 F366A5 repmovsd
246
247 ; Turn off the floppy drive motor
248 000002F5 BAF203 mov dx, 3F2h
249 000002F8 EE out dx, al ; 0 ; 31/12/2013
250
251 ; Enable access to memory above one megabyte
252 L18:
253 000002F9 E464 inal, 64h
254 000002FB A802 testal, 2
255 000002FD 75FA jnz short L18
256 000002FF B0D1 moval, 0D1h; Write output port
257 00000301 E664 out64h, al
258 L19:
259 00000303 E464 inal, 64h
260 00000305 A802 testal, 2
261 00000307 75FA jnz short L19
262 00000309 B0DF moval, 0DFh; Enable A20 line
263 0000030B E660 out60h, al
264 ;L20:
265 ;
266 ; Load global descriptor table register
267
268 ;mov ax, cs
269 ;mov ds, ax
270
271 0000030D 2E0F0116[605C] lgdt [cs:gdtd]
272
273 00000313 0F20C0 mov eax, cr0
274 ; or eax, 1
275 00000316 40 inc ax
276 00000317 0F22C0 mov cr0, eax
277
278 ; Jump to 32 bit code
279
280 0000031A 66 db 66h ; Prefix for 32-bit
281 0000031B EA db 0EAh ; Opcode for far jump
282 0000031C [22030000] dd StartPM ; Offset to start, 32-bit
283 ; (1000h:StartPM = StartPM + 10000h)
284 00000320 0800 dw KCODE; This is the selector for CODE32_DESCRIPTOR,
285 ; assuming that StartPM resides in code32
286
287 ; 20/02/2017
288
289
290 [BITS 32]
291
292 StartPM:
293 ; Kernel Base Address = 0 ; 30/12/2013
294 00000322 66B81000 mov ax, KDATA ; Save data segment identifier
295 00000326 8ED8 mov ds, ax ; Move a valid data segment into DS register
296 00000328 8EC0 mov es, ax ; Move data segment into ES register
297 0000032A 8EE0 mov fs, ax ; Move data segment into FS register
298 0000032C 8EE8 mov gs, ax ; Move data segment into GS register
299 0000032E 8ED0 mov ss, ax ; Move data segment into SS register
300 00000330 BC00000900 mov esp, 90000h ; Move the stack pointer to 090000h
301
302 clear_bss: ; Clear uninitialized data area
303 ; 11/03/2015
304 00000335 31C0 xor eax, eax ; 0
305 00000337 B9136F0000 mov ecx, (bss_end - bss_start)/4
306 ;shr ecx, 2 ; bss section is already aligned for double words
307 0000033C BF[4E550100] mov edi, bss_start
308 00000341 F3AB rep stosd
309
310 memory_init:
311 ; Initialize memory allocation table and page tables
312 ; 16/11/2014
313 ; 15/11/2014
314 ; 07/11/2014
315 ; 06/11/2014
316 ; 05/11/2014
317 ; 04/11/2014
318 ; 31/10/2014 (Retro UNIX 386 v1 - Beginning)
319 ;
320 ;xoreax, eax
321 ;xor ecx, ecx
322 00000343 B108 movcl, 8
323 00000345 BF00001000 movedi, MEM_ALLOC_TBL
324 0000034A F3AB repstosd ; clear Memory Allocation Table
325 ; for the first 1 MB memory
326 ;
327 0000034C 668B0D[EE5C0000] movcx, [mem_1m_1k] ; Number of contiguous KB between
328 ; 1 and 16 MB, max. 3C00h = 15 MB.
329 00000353 66C1E902 shrcx, 2 ; convert 1 KB count to 4 KB count
330 00000357 890D[40580100] mov[free_pages], ecx
331 0000035D 668B15[F05C0000] movdx, [mem_16m_64k] ; Number of contiguous 64 KB blocks
332 ; between 16 MB and 4 GB.
333 00000364 6609D2 ordx, dx
334 00000367 7413 jzshort mi_0
335 ;
336 00000369 6689D0 movax, dx
337 0000036C C1E004 shleax, 4 ; 64 KB -> 4 KB (page count)
338 0000036F 0105[40580100] add[free_pages], eax
339 00000375 0500100000 addeax, 4096 ; 16 MB = 4096 pages
340 0000037A EB07 jmpshort mi_1
341 mi_0:
342 0000037C 6689C8 movax, cx
343 0000037F 66050001 addax, 256 ; add 256 pages for the first 1 MB
344 mi_1:
345 00000383 A3[3C580100] mov[memory_size], eax ; Total available memory in pages
346 ; 1 alloc. tbl. bit = 1 memory page
347 ; 32 allocation bits = 32 mem. pages
348 ;
349 00000388 05FF7F0000 addeax, 32767 ; 32768 memory pages per 1 M.A.T. page
350 0000038D C1E80F shreax, 15 ; ((32768 * x) + y) pages (y < 32768)
351 ; --> x + 1 M.A.T. pages, if y > 0
352 ; --> x M.A.T. pages, if y = 0
353 00000390 66A3[50580100] mov[mat_size], ax ; Memory Alloc. Table Size in pages
354 00000396 C1E00C shleax, 12 ; 1 M.A.T. page = 4096 bytes
355 ; ; Max. 32 M.A.T. pages (4 GB memory)
356 00000399 89C3 movebx, eax ; M.A.T. size in bytes
357 ; Set/Calculate Kernel's Page Directory Address
358 0000039B 81C300001000 addebx, MEM_ALLOC_TBL
359 000003A1 891D[38580100] mov[k_page_dir], ebx ; Kernel's Page Directory address
360 ; just after the last M.A.T. page
361 ;
362 000003A7 83E804 subeax, 4 ; convert M.A.T. size to offset value
363 000003AA A3[48580100] mov[last_page], eax ; last page ofset in the M.A.T.
364 ; ; (allocation status search must be
365 ; stopped after here)
366 000003AF 31C0 xoreax, eax
367 000003B1 48 deceax ; FFFFFFFFh (set all bits to 1)
368 000003B2 6651 pushcx
369 000003B4 C1E905 shrecx, 5 ; convert 1 - 16 MB page count to
370 ; count of 32 allocation bits
371 000003B7 F3AB repstosd
372 000003B9 6659 popcx
373 000003BB 40 inceax ; 0
374 000003BC 80E11F andcl, 31 ; remain bits
375 000003BF 7412 jzshort mi_4
376 000003C1 8907 mov[edi], eax ; reset
377 mi_2:
378 000003C3 0FAB07 bts[edi], eax ; 06/11/2014
379 000003C6 FEC9 deccl
380 000003C8 7404 jzshort mi_3
381 000003CA FEC0 incal
382 000003CC EBF5 jmpshort mi_2
383 mi_3:
384 000003CE 28C0 subal, al ; 0
385 000003D0 83C704 addedi, 4 ; 15/11/2014
386 mi_4:
387 000003D3 6609D2 ordx, dx ; check 16M to 4G memory space
388 000003D6 7421 jzshort mi_6 ; max. 16 MB memory, no more...
389 ;
390 000003D8 B900021000 movecx, MEM_ALLOC_TBL + 512 ; End of first 16 MB memory
391 ;
392 000003DD 29F9 subecx, edi ; displacement (to end of 16 MB)
393 000003DF 7406 jzshort mi_5 ; jump if EDI points to
394 ; end of first 16 MB
395 000003E1 D1E9 shrecx, 1 ; convert to dword count
396 000003E3 D1E9 shrecx, 1 ; (shift 2 bits right)
397 000003E5 F3AB rep stosd ; reset all bits for reserved pages
398 ; (memory hole under 16 MB)
399 mi_5:
400 000003E7 6689D1 movcx, dx ; count of 64 KB memory blocks
401 000003EA D1E9 shrecx, 1 ; 1 alloc. dword per 128 KB memory
402 000003EC 9C pushf ; 16/11/2014
403 000003ED 48 deceax ; FFFFFFFFh (set all bits to 1)
404 000003EE F3AB repstosd
405 000003F0 40 inceax ; 0
406 000003F1 9D popf ; 16/11/2014
407 000003F2 7305 jncshort mi_6
408 000003F4 6648 decax ; eax = 0000FFFFh
409 000003F6 AB stosd
410 000003F7 6640 incax ; 0
411 mi_6:
412 000003F9 39DF cmpedi, ebx ; check if EDI points to
413 000003FB 730A jnbshort mi_7 ; end of memory allocation table
414 ; ; (>= MEM_ALLOC_TBL + 4906)
415 000003FD 89D9 movecx, ebx ; end of memory allocation table
416 000003FF 29F9 subecx, edi ; convert displacement/offset
417 00000401 D1E9 shrecx, 1 ; to dword count
418 00000403 D1E9 shrecx, 1 ; (shift 2 bits right)
419 00000405 F3AB rep stosd ; reset all remain M.A.T. bits
420 mi_7:
421 ; Reset M.A.T. bits in M.A.T. (allocate M.A.T. pages)
422 00000407 BA00001000 movedx, MEM_ALLOC_TBL
423 ;subebx, edx ; Mem. Alloc. Tbl. size in bytes
424 ;shrebx, 12 ; Mem. Alloc. Tbl. size in pages
425 0000040C 668B0D[50580100] movcx, [mat_size] ; Mem. Alloc. Tbl. size in pages
426 00000413 89D7 movedi, edx
427 00000415 C1EF0F shredi, 15 ; convert M.A.T. address to
428 ; byte offset in M.A.T.
429 ; (1 M.A.T. byte points to
430 ; 32768 bytes)
431 ; Note: MEM_ALLOC_TBL address
432 ; must be aligned on 128 KB
433 ; boundary!
434 00000418 01D7 addedi, edx ; points to M.A.T.'s itself
435 ; eax = 0
436 0000041A 290D[40580100] sub[free_pages], ecx ; 07/11/2014
437 mi_8:
438 00000420 0FB307 btr[edi], eax ; clear bit 0 to bit x (1 to 31)
439 ;decbl
440 00000423 FEC9 deccl
441 00000425 7404 jzshort mi_9
442 00000427 FEC0 incal
443 00000429 EBF5 jmpshort mi_8
444 mi_9:
445 ;
446 ; Reset Kernel's Page Dir. and Page Table bits in M.A.T.
447 ;(allocate pages for system page tables)
448
449 ; edx = MEM_ALLOC_TBL
450 0000042B 8B0D[3C580100] movecx, [memory_size] ; memory size in pages (PTEs)
451 00000431 81C1FF030000 addecx, 1023 ; round up (1024 PTEs per table)
452 00000437 C1E90A shrecx, 10 ; convert memory page count to
453 ; page table count (PDE count)
454 ;
455 0000043A 51 pushecx ; (**) PDE count (<= 1024)
456 ;
457 0000043B 41 incecx ; +1 for kernel page directory
458 ;
459 0000043C 290D[40580100] sub[free_pages], ecx ; 07/11/2014
460 ;
461 00000442 8B35[38580100] movesi, [k_page_dir] ; Kernel's Page Directory address
462 00000448 C1EE0C shresi, 12 ; convert to page number
463 mi_10:
464 0000044B 89F0 moveax, esi ; allocation bit offset
465 0000044D 89C3 movebx, eax
466 0000044F C1EB03 shrebx, 3 ; convert to alloc. byte offset
467 00000452 80E3FC andbl, 0FCh ; clear bit 0 and bit 1
468 ; to align on dword boundary
469 00000455 83E01F andeax, 31 ; set allocation bit position
470 ; (bit 0 to bit 31)
471 ;
472 00000458 01D3 addebx, edx ; offset in M.A.T. + M.A.T. address
473 ;
474 0000045A 0FB303 btr [ebx], eax ; reset relevant bit (0 to 31)
475 ;
476 0000045D 46 incesi ; next page table
477 0000045E E2EB loopmi_10 ; allocate next kernel page table
478 ; (ecx = page table count + 1)
479 ;
480 00000460 59 popecx ; (**) PDE count (= pg. tbl. count)
481 ;
482 ; Initialize Kernel Page Directory and Kernel Page Tables
483 ;
484 ; Initialize Kernel's Page Directory
485 00000461 8B3D[38580100] movedi, [k_page_dir]
486 00000467 89F8 moveax, edi
487 00000469 0C03 oral, PDE_A_PRESENT + PDE_A_WRITE
488 ; supervisor + read&write + present
489 0000046B 89CA movedx, ecx ; (**) PDE count (= pg. tbl. count)
490 mi_11:
491 0000046D 0500100000 addeax, 4096; Add page size (PGSZ)
492 ; EAX points to next page table
493 00000472 AB stosd
494 00000473 E2F8 loopmi_11
495 00000475 29C0 subeax, eax; Empty PDE
496 00000477 66B90004 movcx, 1024; Entry count (PGSZ/4)
497 0000047B 29D1 subecx, edx
498 0000047D 7402 jzshort mi_12
499 0000047F F3AB repstosd ; clear remain (empty) PDEs
500 ;
501 ; Initialization of Kernel's Page Directory is OK, here.
502 mi_12:
503 ; Initialize Kernel's Page Tables
504 ;
505 ; (EDI points to address of page table 0)
506 ; eax = 0
507 00000481 8B0D[3C580100] movecx, [memory_size] ; memory size in pages
508 00000487 89CA movedx, ecx; (***)
509 00000489 B003 moval, PTE_A_PRESENT + PTE_A_WRITE
510 ; supervisor + read&write + present
511 mi_13:
512 0000048B AB stosd
513 0000048C 0500100000 addeax, 4096
514 00000491 E2F8 loopmi_13
515 00000493 6681E2FF03 anddx, 1023; (***)
516 00000498 740B jzshort mi_14
517 0000049A 66B90004 movcx, 1024
518 0000049E 6629D1 subcx, dx; from dx (<= 1023) to 1024
519 000004A1 31C0 xoreax, eax
520 000004A3 F3AB repstosd; clear remain (empty) PTEs
521 ; of the last page table
522 mi_14:
523 ; Initialization of Kernel's Page Tables is OK, here.
524 ;
525 000004A5 89F8 moveax, edi; end of the last page table page
526 ; (beginging of user space pages)
527 000004A7 C1E80F shreax, 15; convert to M.A.T. byte offset
528 000004AA 24FC andal, 0FCh; clear bit 0 and bit 1 for
529 ; aligning on dword boundary
530
531 000004AC A3[4C580100] mov[first_page], eax
532 000004B1 A3[44580100] mov[next_page], eax ; The first free page pointer
533 ; for user programs
534 ; (Offset in Mem. Alloc. Tbl.)
535 ;
536 ; Linear/FLAT (1 to 1) memory paging for the kernel is OK, here.
537 ;
538
539 ; Enable paging
540 ;
541 000004B6 A1[38580100] mov eax, [k_page_dir]
542 000004BB 0F22D8 movcr3, eax
543 000004BE 0F20C0 moveax, cr0
544 000004C1 0D00000080 oreax, 80000000h; set paging bit (bit 31)
545 000004C6 0F22C0 movcr0, eax
546 ;jmp KCODE:StartPMP
547
548 000004C9 EA db 0EAh ; Opcode for far jump
549 000004CA [D0040000] dd StartPMP; 32 bit offset
550 000004CE 0800 dw KCODE; kernel code segment descriptor
551
552
553 StartPMP:
554 ; 06/11//2014
555 ; Clear video page 0
556 ;
557 ; Temporary Code
558 ;
559 000004D0 B9E8030000 movecx, 80*25/2
560 000004D5 BF00800B00 movedi, 0B8000h
561 ; 30/01/2016
562 ;xoreax, eax; black background, black fore color
563 000004DA B800070007 moveax, 07000700h ; black background, light gray fore color
564 000004DF F3AB repstosd
565
566 ; 19/08/2014
567 ; Kernel Base Address = 0
568 ; It is mapped to (physically) 0 in the page table.
569 ; So, here is exactly 'StartPMP' address.
570
571 ; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
572 000004E1 BE[8D190100] movesi, starting_msg
573 ;; 14/08/2015 (kernel version message will appear
574 ;; when protected mode and paging is enabled)
575 000004E6 BF00800B00 movedi, 0B8000h ; 27/08/2014
576 000004EB B40A movah, 0Ah ; Black background, light green forecolor
577 ; 20/08/2014
578 000004ED E88F010000 callprintk
579
580 ; 'UNIX v7/x86' source code by Robert Nordier (1999)
581 ; // Set IRQ offsets
582 ;
583 ; Linux (v0.12) source code by Linus Torvalds (1991)
584 ;
585 ;; ICW1
586 000004F2 B011 moval, 11h; Initialization sequence
587 000004F4 E620 out20h, al; 8259A-1
588 ; jmp $+2
589 000004F6 E6A0 out0A0h, al; 8259A-2
590 ;; ICW2
591 000004F8 B020 moval, 20h; Start of hardware ints (20h)
592 000004FA E621 out21h, al;for 8259A-1
593 ; jmp $+2
594 000004FC B028 moval, 28h; Start of hardware ints (28h)
595 000004FE E6A1 out0A1h, al; for 8259A-2
596 ;
597 00000500 B004 moval, 04h;; ICW3
598 00000502 E621 out21h, al; IRQ2 of 8259A-1 (master)
599 ; jmp $+2
600 00000504 B002 moval, 02h; is 8259A-2 (slave)
601 00000506 E6A1 out0A1h, al;
602 ;; ICW4
603 00000508 B001 moval, 01h ;
604 0000050A E621 out21h, al; 8086 mode, normal EOI
605 ; jmp $+2
606 0000050C E6A1 out0A1h, al;for both chips.
607
608 ;moval, 0FFh; mask off all interrupts for now
609 ;out21h, al
610 ;; jmp $+2
611 ;out0A1h, al
612
613 ; 02/04/2015
614 ; 26/03/2015 System call (INT 30h) modification
615 ; DPL = 3 (Interrupt service routine can be called from user mode)
616 ;
617 ;; Linux (v0.12) source code by Linus Torvalds (1991)
618 ; setup_idt:
619 ;
620 ;; 16/02/2015
621 ;;mov dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
622 ; 21/08/2014 (timer_int)
623 0000050E BE[50160100] movesi, ilist
624 00000513 8D3D[50550100] leaedi, [idt]
625 ; 26/03/2015
626 00000519 B930000000 movecx, 48; 48 hardware interrupts (INT 0 to INT 2Fh)
627 ; 02/04/2015
628 0000051E BB00000800 movebx, 80000h
629 rp_sidt1:
630 00000523 AD lodsd
631 00000524 89C2 movedx, eax
632 00000526 66BA008E movdx, 8E00h
633 0000052A 6689C3 movbx, ax
634 0000052D 89D8 moveax, ebx; /* selector = 0x0008 = cs */
635 ; /* interrupt gate - dpl=0, present */
636 0000052F AB stosd; selector & offset bits 0-15
637 00000530 89D0 moveax, edx
638 00000532 AB stosd; attributes & offset bits 16-23
639 00000533 E2EE looprp_sidt1
640 ; 15/04/2016
641 ; TRDOS 386 (TRDOS v2.0) /// 32 sofware interrupts ///
642 ;movcl, 16 ; 16 software interrupts (INT 30h to INT 3Fh)
643 00000535 B120 movcl, 32 ; 32 software interrupts (INT 30h to INT 4Fh)
644 rp_sidt2:
645 00000537 AD lodsd
646 00000538 21C0 andeax, eax
647 0000053A 7413 jzshort rp_sidt3
648 0000053C 89C2 movedx, eax
649 0000053E 66BA00EE movdx, 0EE00h; P=1b/DPL=11b/01110b
650 00000542 6689C3 movbx, ax
651 00000545 89D8 moveax, ebx; selector & offset bits 0-15
652 00000547 AB stosd
653 00000548 89D0 moveax, edx
654 0000054A AB stosd
655 0000054B E2EA looprp_sidt2
656 0000054D EB16 jmpshort sidt_OK
657 rp_sidt3:
658 0000054F B8[AA0A0000] moveax, ignore_int
659 00000554 89C2 movedx, eax
660 00000556 66BA00EE movdx, 0EE00h; P=1b/DPL=11b/01110b
661 0000055A 6689C3 movbx, ax
662 0000055D 89D8 moveax, ebx; selector & offset bits 0-15
663 rp_sidt4:
664 0000055F AB stosd
665 00000560 92 xchgeax, edx
666 00000561 AB stosd
667 00000562 92 xchgedx, eax
668 00000563 E2FA looprp_sidt4
669 sidt_OK:
670 00000565 0F011D[665C0000] lidt [idtd]
671 ;
672 ; TSS descriptor setup ; 24/03/2015
673 0000056C B8[D0570100] moveax, task_state_segment
674 00000571 66A3[5A5C0000] mov[gdt_tss0], ax
675 00000577 C1C010 roleax, 16
676 0000057A A2[5C5C0000] mov[gdt_tss1], al
677 0000057F 8825[5F5C0000] mov[gdt_tss2], ah
678 00000585 66C705[36580100]68- movword [tss.IOPB], tss_end - task_state_segment
678 0000058D 00
679 ;
680 ; IO Map Base address (When this address points
681 ; to end of the TSS, CPU does not use IO port
682 ; permission bit map for RING 3 IO permissions,
683 ; access to any IO ports in ring 3 will be forbidden.)
684 ;
685 ;mov[tss.esp0], esp ; TSS offset 4
686 ;movword [tss.ss0], KDATA ; TSS offset 8 (SS)
687 0000058E 66B82800 movax, TSS ; It is needed when an interrupt
688 ; occurs (or a system call -software INT- is requested)
689 ; while cpu running in ring 3 (in user mode).
690 ; (Kernel stack pointer and segment will be loaded
691 ; from offset 4 and 8 of the TSS, by the CPU.)
692 00000592 0F00D8 ltrax ; Load task register
693 ;
694 esp0_set0:
695 ; 30/07/2015
696 00000595 8B0D[3C580100] mov ecx, [memory_size] ; memory size in pages
697 0000059B C1E10C shl ecx, 12 ; convert page count to byte count
698 0000059E 81F900004000 cmpecx, CORE ; beginning of user's memory space (400000h)
699 ; (kernel mode virtual address)
700 000005A4 7605 jnashort esp0_set1
701 ;
702 ; If available memory > CORE (end of the 1st 4 MB)
703 ; set stack pointer to CORE
704 ;(Because, PDE 0 is reserved for kernel space in user's page directory)
705 ;(PDE 0 points to page table of the 1st 4 MB virtual address space)
706 000005A6 B900004000 movecx, CORE
707 esp0_set1:
708 000005AB 89CC movesp, ecx ; top of kernel stack (**tss.esp0**)
709 esp0_set_ok:
710 ; 30/07/2015 (**tss.esp0**)
711 000005AD 8925[D4570100] mov[tss.esp0], esp
712 000005B3 66C705[D8570100]10- mov word [tss.ss0], KDATA
712 000005BB 00
713 ; 14/08/2015
714 ; 10/11/2014 (Retro UNIX 386 v1 - Erdogan Tan)
715 ;
716 ;cli; Disable interrupts (for CPU)
717 ; (CPU will not handle hardware interrupts, except NMI!)
718 ;
719 000005BC 30C0 xoral, al; Enable all hardware interrupts!
720 000005BE E621 out21h, al; (IBM PC-AT compatibility)
721 000005C0 EB00 jmp $+2; (All conventional PC-AT hardware
722 000005C2 E6A1 out0A1h, al; interrupts will be in use.)
723 ; (Even if related hardware component
724 ; does not exist!)
725 ; Enable NMI
726 000005C4 B07F moval, 7Fh; Clear bit 7 to enable NMI (again)
727 000005C6 E670 out 70h, al
728 ; 23/02/2015
729 000005C8 90 nop
730 000005C9 E471 inal, 71h; read in 71h just after writing out to 70h
731 ; for preventing unknown state (!?)
732 ;
733 ; Only a NMI can occur here... (Before a 'STI' instruction)
734 ;
735 ; 02/09/2014
736 000005CB 6631DB xorbx, bx
737 000005CE 66BA0002 movdx, 0200h; Row 2, column 0 ; 07/03/2015
738 000005D2 E871170000 call_set_cpos; 24/01/2016
739 ;
740 ; 06/11/2014
741 000005D7 E8782C0000 callmemory_info
742 ; 14/08/2015
743 ;call getch ; 28/02/2015
744 drv_init:
745 000005DC FB sti; Enable Interrupts
746 ; 06/02/2015
747 000005DD 8B15[F85C0000] movedx, [hd0_type] ; hd0, hd1, hd2, hd3
748 000005E3 668B1D[F65C0000] movbx, [fd0_type] ; fd0, fd1
749 ; 22/02/2015
750 000005EA 6621DB andbx, bx
751 000005ED 751C jnzshort di1
752 ;
753 000005EF 09D2 or edx, edx
754 000005F1 752A jnzshort di2
755 ;
756 setup_error:
757 000005F3 BE[56190100] mov esi, setup_error_msg
758 psem:
759 000005F8 AC lodsb
760 000005F9 08C0 oral, al
761 ;jzshort haltx ; 22/02/2015
762 000005FB 7427 jzshort di3
763 000005FD 56 pushesi
764 ; 13/05/2016
765 000005FE BB07000000 movebx, 7; Black background,
766 ; light gray forecolor
767 ; Video page 0 (BH=0)
768 00000603 E8AA160000 call_write_tty
769 00000608 5E popesi
770 00000609 EBED jmpshort psem
771
772 di1:
773 ; supress 'jmp short T6'
774 ; (activate fdc motor control code)
775 0000060B 66C705[EB060000]90- movword [T5], 9090h ; nop
775 00000613 90
776 ;
777 ;movax, int_0Eh; IRQ 6 handler
778 ;movdi, 0Eh*4; IRQ 6 vector
779 ;stosw
780 ;mov ax, cs
781 ;stosw
782 ;; 16/02/2015
783 ;;mov dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
784 ;
785 00000614 E8AF3B0000 CALLDSKETTE_SETUP; Initialize Floppy Disks
786 ;
787 00000619 09D2 oredx, edx
788 0000061B 7407 jz short di3
789 di2:
790 0000061D E8EC3B0000 call DISK_SETUP; Initialize Fixed Disks
791 00000622 72CF jc short setup_error
792 di3:
793 00000624 E8FF2B0000 callsetup_rtc_int; 22/05/2015 (dsectrpm.s)
794 ;
795 00000629 E8BE110100 calldisplay_disks ; 07/03/2015 (Temporary)
796 ;haltx:
797 ; 14/08/2015
798 ;callgetch ; 22/02/2015
799 ;sti; Enable interrupts (for CPU)
800 ;; 29/01/2016
801 ;subah, ah ; read time count
802 ;callint1Ah
803 ;movedx, ecx ; 18.2 * seconds
804 ;md_info_msg_wait1:
805 ;; 29/01/2016
806 ;movah, 1
807 ;callint16h
808 ;jzshort md_info_msg_wait2
809 ;xorah, ah ; 0
810 ; call int16h
811 ;jmp short md_info_msg_ok
812 ;md_info_msg_wait2:
813 ;subah, ah ; read time count
814 ;callint1Ah
815 ;cmpedx, ecx ; ; 18.2 * seconds
816 ;jnashort md_info_msg_wait3
817 ;xchg edx, ecx
818 ;md_info_msg_wait3:
819 ;subecx, edx
820 ;cmpecx, 127 ; 7 seconds (18.2 * 7)
821 ;jbshort md_info_msg_wait1
822 ;md_info_msg_ok:
823 ; 08/09/2016
824 0000062E 0F20C0 moveax, cr0
825 00000631 A810 testal, 10h ; Bit 4, ET (Extension Type)
826 00000633 7408 jzshort sysinit
827 ; 27/02/2017
828 00000635 FE05[F8650100] incbyte [fpready]
829 ; 80387 (FPU) is ready
830 0000063B DBE3 fninit ; Initialize Floating-Point Unit
831 sysinit:
832 ; 30/06/2015
833 0000063D E80C5C0000 callsys_init
834 ;
835 ;jmp cpu_reset ; 22/02/2015
836 hang:
837 ; 23/02/2015
838 ;sti; Enable interrupts
839 00000642 F4 hlt
840 ;
841 ;nop
842 ;; 03/12/2014
843 ;; 28/08/