wok annotate linld/stuff/src/JUMP.ASM @ rev 20745

azpainter: update WGET_URL
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sun Feb 10 10:35:42 2019 +0100 (2019-02-10)
parents af959ebf1305
children cbcb33ee9044
rev   line source
pascal@19515 1 ;***************************************************************
pascal@19515 2 ;****** This file is distributed under GPL
pascal@19515 3 ;***************************************************************
pascal@19515 4 ideal
pascal@19515 5 %crefref
pascal@19515 6 %noincl
pascal@19515 7 %nomacs
pascal@19636 8 ifdef NO386
pascal@19636 9 p8086
pascal@19636 10 else
pascal@19515 11 p386
pascal@19636 12 endif
pascal@19515 13
pascal@19903 14 group DGROUP _TEXT,_DATA,_BSS
pascal@19515 15 assume cs:DGROUP,ds:DGROUP
pascal@19515 16
pascal@19903 17 segment _DATA byte public use16 'DATA'
pascal@19903 18
pascal@19903 19 overflow db "Loaded too close to 9000:0",0
pascal@19903 20
pascal@19903 21 ends _DATA
pascal@19903 22
pascal@19515 23 segment _BSS byte public use16 'BSS'
pascal@19515 24
pascal@19899 25 global _imgs:dword
pascal@19515 26
pascal@19515 27 ends _BSS
pascal@19515 28
pascal@19515 29
pascal@19515 30 segment _TEXT byte public use16 'CODE'
pascal@19515 31
pascal@19905 32 ;***************************************************************
pascal@20473 33 ;void dos_shutdown()
pascal@20473 34 ;***************************************************************
pascal@20473 35
pascal@20473 36 macro dos_shutdown
pascal@20481 37 xor di,di
pascal@20481 38 mov ds,di
pascal@20473 39 ifndef NO386
pascal@20481 40 push [dword di+4] ; save step
pascal@20481 41 mov [word di+4],offset step19
pascal@20473 42 else
pascal@20473 43 mov ax,offset step19
pascal@20481 44 xchg ax,[word di+4]
pascal@20481 45 push [word di+6]
pascal@20473 46 push ax ; save step
pascal@20473 47 endif
pascal@20473 48 mov [word cs:sssp],sp
pascal@20481 49 ;cmp [byte di+7],0F0h
pascal@20473 50 ;jnc notdos
pascal@20481 51 mov [di+6],cs
pascal@20473 52 pushf
pascal@20473 53 pushf
pascal@20473 54 pop ax
pascal@20473 55 inc ah ; set TF
pascal@20473 56 push ax
pascal@20473 57 popf
pascal@20481 58 call [dword di+4*19h]
pascal@20473 59 notdos:
pascal@20473 60 ifndef NO386
pascal@20473 61 lss sp,[dword cs:sssp]
pascal@20473 62 else
pascal@20473 63 lds ax,[dword cs:sssp]
pascal@20473 64 push ds
pascal@20473 65 pop ss
pascal@20473 66 xchg ax,sp
pascal@20473 67 endif
pascal@20481 68 xor di,di
pascal@20481 69 mov ds,di
pascal@20481 70 pop [dword di+4] ; restore step
pascal@20473 71 endm
pascal@20473 72 macro step19code
pascal@20473 73 step19:
pascal@20481 74 push di
pascal@20473 75 push ds
pascal@20481 76 mov di,sp
pascal@20481 77 lds di,[dword ss:di+4] ; read cs:ip
pascal@20481 78 cmp [word di],19CDh ; int 19h ?
pascal@20473 79 pop ds
pascal@20481 80 pop di
pascal@20473 81 je notdos
pascal@20473 82 iret
pascal@20473 83 endm
pascal@20473 84
pascal@20473 85
pascal@20473 86 ;***************************************************************
pascal@19905 87 ;void boot_kernel();
pascal@19905 88 ;****** Never returns
pascal@19905 89 ;***************************************************************
pascal@19903 90 global _boot_kernel:near
pascal@19905 91 proc _boot_kernel near
pascal@19905 92
pascal@20142 93 p8086
pascal@19903 94 extrn _heap_top:word
pascal@20527 95 global sssp:dword
pascal@19903 96 ifdef NO386
pascal@19903 97 extrn _topseg:near
pascal@19903 98 call near _topseg
pascal@20483 99 mov cl,4
pascal@20527 100 org $-4
pascal@20527 101 sssp dd ?
pascal@20475 102 mov [word sssp+2],ax
pascal@19903 103 xchg ax,bx
pascal@20473 104 mov ax,[_heap_top]
pascal@19903 105 shr ax,cl
pascal@19903 106 else
pascal@20142 107 p386
pascal@20473 108 mov ax,[_heap_top]
pascal@20520 109 shr ax,4
pascal@20475 110 mov bx,9000h
pascal@20520 111 org $-4
pascal@20520 112 sssp dd ?
pascal@19903 113 endif
pascal@20473 114 mov es,bx
pascal@19903 115 mov dx,cs
pascal@19903 116 add ax,dx
pascal@19903 117 cmp ax,bx
pascal@19905 118 jb @@nooverflow
pascal@19903 119 ; Oops! We can stomp on our toes... better stop now
pascal@19903 120 mov bx,offset overflow
pascal@19903 121 extrn die:near
pascal@20427 122 call near die
pascal@19905 123 @@nooverflow:
pascal@20473 124 ;cli ; we start doing destructive things to DOS
pascal@19571 125 push es
pascal@19571 126 pop ss
pascal@19571 127 mov sp,0A000h
pascal@19636 128 extrn _rm_size:word
pascal@20745 129 ifdef NO386
pascal@20745 130 mov si,offset _rm_size-2 ; _rm_size, _pm_high, _rm_buf
pascal@20745 131 lodsw
pascal@20745 132 push ax ; _csip high
pascal@20745 133 push [word si-4] ; _csip low
pascal@20745 134 else
pascal@20745 135 extrn _csip:dword;
pascal@20745 136 push [dword _csip] ; _csip
pascal@19636 137 mov si,offset _rm_size ; _rm_size, _pm_high, _rm_buf
pascal@20745 138 endif
pascal@19636 139 lodsw
pascal@19636 140 xchg ax,cx ; _rm_size
pascal@19636 141 lodsb ; _pm_high
pascal@19636 142 mov si,[si] ; _rm_buf
pascal@19571 143 xor di,di
pascal@19571 144 ;cld
pascal@19571 145 rep
pascal@19571 146 movsb
pascal@19571 147 extrn _cmdline:word
pascal@19571 148 mov si,[_cmdline]
pascal@19571 149 mov di,8000h
pascal@19571 150 mov ch,10h ; 4k
pascal@19571 151 rep
pascal@19571 152 movsb
pascal@20481 153 ifdef NO386
pascal@20481 154 add bh,9
pascal@19637 155 push bx ; topseg()+0x0900
pascal@19637 156 else
pascal@19905 157 push 9800h+(4096/16) ; 4096 bytes for cmdline
pascal@19637 158 endif
pascal@20485 159 cmp al,cl ; load high ?
pascal@20485 160 pushf
pascal@19515 161 ; finish loading
pascal@19515 162 extrn @last_ditch$qv:near
pascal@19515 163 call @last_ditch$qv
pascal@20485 164 dos_shutdown ; clear di; ds=0
pascal@20485 165 push cs
pascal@20485 166 pop ds
pascal@20485 167 popf
pascal@19515 168 ; self move
pascal@19571 169 ;cld
pascal@19538 170 pop es ; min 2048 bytes for stack
pascal@20485 171 jne @@isbzimage
pascal@20534 172 extrn gdt_data
pascal@20534 173 mov cx,offset gdt_data+8
pascal@19538 174 xor si,si ; A000 -9000 -0800(>movedend)
pascal@19515 175 rep
pascal@19515 176 movsb
pascal@20485 177 mov ax,[word _imgs+2+2] ; get pm->fallback high word
pascal@20484 178 push es
pascal@20484 179 call near @@isbzimage ; pop cs ; ds=es=ss
pascal@20477 180
pascal@20477 181 ; prepare memcpy32 size & srcofs param to move zImage pm
pascal@20477 182 mov dx,8
pascal@20477 183 cmp ax,dx ; buf > 80000h ?
pascal@20477 184 ja @@bufhigh
pascal@20477 185 sub dx,ax
pascal@20477 186 inc dx ; up to 90000h-1
pascal@20477 187 @@bufhigh:
pascal@20477 188 push dx ; size hi
pascal@20477 189 push cx ; size lo=up to 512k
pascal@20477 190 push ax ; src ofs ho = pm.fallback
pascal@20477 191
pascal@19538 192 ;in al,70h
pascal@19538 193 ;or al,80h ; disable NMI
pascal@19538 194 ;out 70h,al
pascal@20477 195
pascal@20485 196 xor di,di
pascal@20481 197 push di ; src ofs lo
pascal@20481 198 push di ; src seg=0
pascal@19636 199 ifdef NO386
pascal@20481 200 inc di
pascal@20481 201 push di ; dst ofs hi
pascal@20481 202 dec di
pascal@19636 203 else
pascal@20477 204 push 1 ; dst ofs hi
pascal@19636 205 endif
pascal@20481 206 push di ; dst ofs lo : 64k
pascal@20528 207 extrn memcpy32:near
pascal@20528 208 call memcpy32
pascal@19515 209
pascal@19515 210 ifndef noelks
pascal@19515 211 ifndef NO386
pascal@19515 212 cmp [dword 1E6h],'SKLE'
pascal@20473 213 jne @@notelks
pascal@20481 214 xor si,si
pascal@19515 215 else
pascal@20481 216 mov si,1E6h
pascal@20481 217 lodsw
pascal@20481 218 cmp ax,'LE'
pascal@19905 219 jne @@notelks
pascal@20481 220 lodsw
pascal@20481 221 xor ax,'SK'
pascal@20473 222 jne @@notelks
pascal@20481 223 xchg ax,si
pascal@19515 224 endif
pascal@20481 225 push es
pascal@20481 226 pop ss
pascal@20481 227 mov cx,120h ; CS=0120
pascal@20481 228 push cx
pascal@20481 229 push si ; IP=0000
pascal@20481 230 mov cl,0 ; DS=ES=SS=0100
pascal@20475 231 mov es,cx
pascal@20475 232 mov ch,05h ; 500h mini
pascal@19515 233 rep
pascal@19515 234 movsw
pascal@19905 235 @@notelks:
pascal@19515 236 endif
pascal@19905 237 @@isbzimage:
pascal@19515 238 push ss
pascal@19515 239 pop ds
pascal@20475 240 push ss
pascal@20475 241 pop es
pascal@19636 242 ifndef NO386
pascal@19515 243 push ss
pascal@19515 244 pop fs
pascal@19515 245 push ss
pascal@19515 246 pop gs
pascal@19636 247 endif
pascal@19515 248 assume nothing
pascal@19515 249 assume cs:DGROUP
pascal@19515 250 retf
pascal@19515 251
pascal@20473 252 step19code
pascal@20477 253
pascal@20477 254 endp _boot_kernel
pascal@20477 255
pascal@19515 256 movedend:
pascal@19515 257
pascal@19515 258 ends _TEXT
pascal@19515 259
pascal@19515 260 end
pascal@19515 261
pascal@19515 262 ;###### END OF FILE ############################################