wok annotate linld/stuff/src/_BEG.ASM @ rev 22312

get-LibreOffice: look for available versions
author Pascal Bellard <pascal.bellard@slitaz.org>
date Thu Nov 14 10:49:19 2019 +0100 (2019-11-14)
parents f0896fb1b287
children 56ee356284c6
rev   line source
pascal@19515 1 ;***************************************************************
pascal@19515 2 ;****** This file is distributed under GPL
pascal@19515 3 ;***************************************************************
pascal@19515 4 ideal
pascal@21984 5 %PAGESIZE 1000
pascal@19515 6 %crefref
pascal@19515 7 %noincl
pascal@19515 8 %nomacs
pascal@19636 9 p8086
pascal@19515 10
pascal@19515 11 group DGROUP _TEXT,_DATA,_BSS
pascal@19515 12 assume cs:DGROUP,ds:DGROUP
pascal@19515 13
pascal@19515 14 segment _TEXT byte public use16 'CODE'
pascal@20451 15 ends _TEXT
pascal@20451 16
pascal@20451 17 segment _DATA byte public use16 'DATA'
pascal@20451 18 global _data_start:byte
pascal@20451 19 label _data_start byte
pascal@20451 20 ifndef NO386
pascal@22183 21 msg_badcpu db "I need 386+ CPU in real mode w/o paging"
pascal@22183 22 db " or "
pascal@22183 23 msg_badmapping db "under VCPI 4.0+ manager with low 640k 1:1 mapping"
pascal@22183 24 global _vcpi:byte
pascal@22183 25 _vcpi db 0
pascal@20451 26 endif
pascal@20451 27
pascal@20451 28 ends _DATA
pascal@20451 29
pascal@20451 30 segment _BSS byte public use16 'BSS'
pascal@21757 31
pascal@20451 32 global _bss_start:byte
pascal@20451 33 label _bss_start byte
pascal@22312 34 global stktop:byte
pascal@22183 35 ifdef NO386
pascal@22183 36 global _cpu386:byte
pascal@22183 37 _cpu386 db ?
pascal@22183 38 org $-1
pascal@22183 39 endif
pascal@20451 40 global _cpu_features:dword
pascal@20451 41 _cpu_features dd ?
pascal@20451 42 ends _BSS
pascal@20451 43
pascal@20451 44 segment _TEXT byte public use16 'CODE'
pascal@19515 45
pascal@19825 46 macro cpuid
pascal@19825 47 db 0fh,0A2h
pascal@19825 48 endm
pascal@19825 49
pascal@19515 50 org 100h
pascal@19515 51 global _text_start:byte
pascal@19515 52 label _text_start byte
pascal@19546 53
pascal@19515 54 ;***************************************************************
pascal@19515 55 ; clear bss
pascal@19515 56 ;***************************************************************
pascal@21757 57 mov sp,offset stktop
pascal@22179 58 mov si,offset _bss_start
pascal@20457 59 mov bx, 0F000h ; cld ; cli & empty string
pascal@19515 60 clearbss:
pascal@22312 61 mov [si],bl ; clear bss + heap
pascal@20426 62 inc si
pascal@19546 63 jne clearbss
pascal@19546 64
pascal@19546 65 ;***************************************************************
pascal@19546 66 ; check CPU
pascal@19546 67 ;***************************************************************
pascal@19546 68
pascal@19546 69 ; Check for oldies
pascal@19873 70 push bx ; < 286 : flags[12..15] are forced 1
pascal@19873 71 popf ; = 286 : flags[12..15] are forced 0
pascal@19873 72 pushf ; > 286 : only flags[15] is forced 0
pascal@19873 73 pop dx
pascal@20451 74 add dh,bh ; NS=386+, S+NC=286, S+C=86/186
pascal@20451 75 ifndef NO386
pascal@19873 76 mov bx,offset msg_badcpu
pascal@22183 77 js godie ;it is not a 386+, die
pascal@20451 78 else
pascal@22183 79 js endcpu86 ;it is not a 386+, try ELKS & co
pascal@19546 80 endif
pascal@19636 81 p386
pascal@19546 82 ; Check for vm
pascal@19546 83 smsw ax ;SMSW cannot be trapped! :-)
pascal@19571 84 and al,1 ;MSW_PE
pascal@19546 85 ; We're in vm
pascal@20457 86 jnz check_vcpi
pascal@20457 87
pascal@20457 88 check_rm_paging:
pascal@20457 89 ; It's a 386 in real mode, chk for paging (crazy but possible)
pascal@20457 90 mov eax,cr0
pascal@20457 91 inc eax ;CR0_PG to S
pascal@20457 92 jns endcpu386
pascal@22183 93 ifndef NO386
pascal@20457 94 p8086
pascal@20457 95 extrn die:near
pascal@20457 96 godie:
pascal@22183 97 no_vcpi:
pascal@20457 98 call near die
pascal@22183 99 else
pascal@22183 100 jmp endcpu86
pascal@22183 101 endif
pascal@19546 102
pascal@19546 103 ;***************************************************************
pascal@19546 104 ; checks for vcpi
pascal@19546 105 ;***************************************************************
pascal@19546 106 label check_vcpi near
pascal@20457 107 p386
pascal@19546 108 push ds
pascal@19546 109 ; Check whether it is safe to call 67h (we trust only known EMM managers)
pascal@20426 110 push si
pascal@19546 111 pop ds
pascal@19546 112 mov ds,[word 67h*4+2]
pascal@20426 113 cmp [dword si+10+4],'0XXX'
pascal@19546 114 jne skip
pascal@19825 115 ;mov eax,'XMME'
pascal@20426 116 ;xor eax,[dword si+10]
pascal@19546 117 ; QMME also works (as told by <J.S.Peatfield@damtp.cambridge.ac.uk>)
pascal@19825 118 ;shl eax,8
pascal@19825 119 mov ax,'ME'
pascal@20426 120 xor ax,[word si+10]
pascal@19546 121 skip:
pascal@19546 122 pop ds
pascal@19546 123 jne no_vcpi
pascal@19546 124
pascal@19546 125 ; Check emm manager status and version
pascal@19571 126 ;mov ah,40h ; get status
pascal@19571 127 ;int 67h
pascal@22203 128 ;inc ax
pascal@22203 129 ;js no_vcpi
pascal@19546 130 mov ah,46h ; get version
pascal@19546 131 int 67h
pascal@22204 132 cmp ax,40h ; version must be >= 4.0
pascal@22203 133 jl no_vcpi ; btw check ax.15
pascal@19546 134 ; Check vcpi manager status
pascal@19546 135 ;;mov ax,5A01h ; ALLOCATE RAW PAGES
pascal@19546 136 ;;mov bx,4
pascal@19546 137 ;;int 67h
pascal@22203 138 ;;inc ax
pascal@22203 139 ;;js no_vcpi
pascal@19546 140 ;;push dx ;$ save handle
pascal@19546 141 mov ax,0DE00h ; check for vcpi present
pascal@19546 142 int 67h
pascal@19546 143 test ah,ah
pascal@19571 144 jnz no_vcpi
pascal@19546 145 is386vcpi:
pascal@19546 146 extrn prepare_vcpi:near
pascal@19546 147 call prepare_vcpi
pascal@19546 148 ; get_vcpi_interface() || die("VCPI: low 640k: need 1:1 mapping");
pascal@19546 149 ;extrn _get_vcpi_interface:near
pascal@19546 150 ;call _get_vcpi_interface
pascal@22183 151 ifndef NO386
pascal@19546 152 mov bx,offset msg_badmapping
pascal@20457 153 jnz no_vcpi
pascal@22183 154 dec [byte bx+_vcpi-msg_badmapping]
pascal@22183 155 else
pascal@22183 156 jnz no_vcpi
pascal@22183 157 extrn _vcpi:byte
pascal@22183 158 dec [byte _vcpi]
pascal@22183 159 endif
pascal@20457 160 endcpu386:
pascal@20457 161 pushfd
pascal@20457 162 pop dx
pascal@20457 163 pop ax
pascal@20457 164 mov bl,al
pascal@20457 165 xor al,20h ; toggle CPUID feature bit 21
pascal@20457 166 push ax
pascal@20457 167 push dx
pascal@20457 168 popfd
pascal@20457 169 pushfd
pascal@22203 170 pop dx ; dx.1=flags.1=1
pascal@20457 171 pop ax
pascal@20457 172 xor al,bl ; clear C
pascal@20457 173 je @@no_cpuid ; CPUID feature bit changed ?
pascal@20457 174 mov eax,80000001h ; Extended Processor Info and Feature Bits
pascal@20457 175 cpuid
pascal@22183 176 ifdef NO386
pascal@22204 177 mov dl,-1 ; set 386 flag
pascal@22203 178 db 66h ; mov [_cpu_features],edx
pascal@22203 179 @@no_cpuid:
pascal@22203 180 mov [word _cpu_features],dx ; dl != 0
pascal@22203 181 no_vcpi:
pascal@22203 182 else
pascal@20457 183 mov [_cpu_features],edx
pascal@20457 184 @@no_cpuid:
pascal@22203 185 endif
pascal@20457 186 endcpu86:
pascal@19636 187 p8086
pascal@19546 188
pascal@19515 189 ;***************************************************************
pascal@19515 190 ; build argv & argc
pascal@19515 191 ;***************************************************************
pascal@22203 192 extrn _bss_end:word
pascal@22203 193 mov di,offset _bss_end
pascal@22203 194 global _heap_top
pascal@22203 195 org $-2
pascal@22203 196 _heap_top dw ?
pascal@19546 197 ;xor ax,ax
pascal@19546 198 ;push ax ; envp (already cleared)
pascal@19546 199 ;mov [word di],ax ; argv[0] = 0 (idem)
pascal@19515 200 mov si,80h
pascal@19515 201 lodsb
pascal@19515 202 cmp al,7Eh
pascal@19515 203 jbe alok
pascal@19515 204 mov al,7Eh
pascal@19515 205 alok:
pascal@19546 206 cbw
pascal@19515 207 xchg ax,bx
pascal@19515 208 mov [bx+si],bh ; set eos
pascal@19515 209 argbuild:
pascal@20160 210 ifdef DEBUG
pascal@20142 211 p386
pascal@20142 212 pusha
pascal@20142 213 mov bx,si
pascal@20142 214 extrn puts:near
pascal@20142 215 call puts
pascal@20142 216 popa
pascal@20160 217 endif
pascal@19515 218 mov bx,2 ; argc * 2
pascal@19515 219 argeos:
pascal@20451 220 mov cx,1 ; look for a start of string
pascal@19515 221 mov [byte si-1],bh ; mark eos
pascal@19515 222 mov ah,20h ; space will be eos
pascal@19515 223 arglp:
pascal@19515 224 lodsb
pascal@19515 225 cmp al,0h
pascal@19515 226 je argdone
pascal@19515 227 cmp al,20h
pascal@19515 228 jb argeos
pascal@19515 229 cmp al,ah
pascal@19515 230 je argeos
pascal@19515 231 cmp al,27h
pascal@19515 232 je isargstr
pascal@19515 233 cmp al,22h
pascal@19515 234 je isargstr
pascal@20451 235 jcxz arglp ; not start of string
pascal@19515 236 dec si
pascal@19884 237 ;jmp newarg
pascal@20451 238 db 0BAh ; mov dx,im opcode
pascal@19515 239 isargstr:
pascal@19515 240 mov ah,al ; expected eos
pascal@19515 241 newarg:
pascal@19515 242 mov [word bx+di],si ; argv[argc++] = si
pascal@19515 243 inc bx
pascal@19515 244 inc bx
pascal@20451 245 dec cx
pascal@19515 246 jmp arglp
pascal@19515 247 argdone:
pascal@19515 248 ;mov [word bx+di],0 ; argv[argc] = 0
pascal@19546 249 lea ax,[bx+di+2]
pascal@19546 250 mov [_heap_top],ax
pascal@19515 251 push di ; argv
pascal@19515 252 shr bx,1
pascal@19515 253 push bx ; argc
pascal@19515 254 ifndef filearg
pascal@19515 255 mov bx,[di+2] ; argv[1]
pascal@20528 256 extrn openargs:near
pascal@20528 257 call near openargs
pascal@19515 258 jc argend
pascal@19515 259 pop bx ; trash argc, argv >> 1Kb !
pascal@19546 260 global read_cmdline:near
pascal@20528 261 pop cx ; sizemax=argv
pascal@19546 262 read_cmdline:
pascal@20528 263 mov dx,di
pascal@20528 264 push dx
pascal@19515 265 push ax
pascal@20528 266 xchg ax,bx
pascal@20528 267 extrn @read$cxdxbx:near ; read(fd=bx,buffer=dx,size=cx)
pascal@20528 268 call near @read$cxdxbx
pascal@19515 269 pop bx ; fd for close
pascal@19515 270 pop si ; si=buffer=argv
pascal@19515 271 add di,ax
pascal@19515 272 extrn close:near
pascal@19515 273 call near close
pascal@19515 274 jmp argbuild
pascal@19515 275 argend:
pascal@19515 276 endif
pascal@19515 277
pascal@19515 278 ;***************************************************************
pascal@21757 279 extrn _main:near
pascal@21757 280 call _main
pascal@21757 281 ;never return
pascal@19538 282
pascal@19515 283 ;***************************************************************
pascal@21757 284
pascal@19515 285 ends _TEXT
pascal@19515 286
pascal@19515 287
pascal@19515 288 end _text_start
pascal@19515 289
pascal@19515 290 ;###### END OF FILE ############################################