wok-6.x annotate linld/stuff/src/JUMP.ASM @ rev 20485

linld: fix memcpy32 (16 low mem case)
author Pascal Bellard <pascal.bellard@slitaz.org>
date Tue Oct 23 08:25:49 2018 +0200 (2018-10-23)
parents 81a3d87e0965
children d7919052f62f
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@20475 95 global sssp
pascal@19903 96 ifdef NO386
pascal@20475 97 sssp:
pascal@19903 98 extrn _topseg:near
pascal@19903 99 call near _topseg
pascal@20483 100 mov cl,4
pascal@20475 101 mov [word sssp+2],ax
pascal@19903 102 xchg ax,bx
pascal@20473 103 mov ax,[_heap_top]
pascal@19903 104 shr ax,cl
pascal@19903 105 else
pascal@20142 106 p386
pascal@20473 107 mov ax,[_heap_top]
pascal@20475 108 ;shr ax,4
pascal@20475 109 db 0C1h,0E8h
pascal@20475 110 sssp:
pascal@20475 111 db 4
pascal@20475 112 mov bx,9000h
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@19900 128 extrn _csip:dword
pascal@19900 129 push [dword _csip]
pascal@19636 130 extrn _rm_size:word
pascal@19636 131 mov si,offset _rm_size ; _rm_size, _pm_high, _rm_buf
pascal@19636 132 lodsw
pascal@19636 133 xchg ax,cx ; _rm_size
pascal@19636 134 lodsb ; _pm_high
pascal@19636 135 mov si,[si] ; _rm_buf
pascal@19571 136 xor di,di
pascal@19571 137 ;cld
pascal@19571 138 rep
pascal@19571 139 movsb
pascal@19571 140 extrn _cmdline:word
pascal@19571 141 mov si,[_cmdline]
pascal@19571 142 mov di,8000h
pascal@19571 143 mov ch,10h ; 4k
pascal@19571 144 rep
pascal@19571 145 movsb
pascal@20481 146 ifdef NO386
pascal@20481 147 add bh,9
pascal@19637 148 push bx ; topseg()+0x0900
pascal@19637 149 else
pascal@19905 150 push 9800h+(4096/16) ; 4096 bytes for cmdline
pascal@19637 151 endif
pascal@20485 152 cmp al,cl ; load high ?
pascal@20485 153 pushf
pascal@19515 154 ; finish loading
pascal@19515 155 extrn @last_ditch$qv:near
pascal@19515 156 call @last_ditch$qv
pascal@20485 157 dos_shutdown ; clear di; ds=0
pascal@20485 158 push cs
pascal@20485 159 pop ds
pascal@20485 160 popf
pascal@19515 161 ; self move
pascal@19571 162 ;cld
pascal@19538 163 pop es ; min 2048 bytes for stack
pascal@20485 164 jne @@isbzimage
pascal@20481 165 mov cx,offset movedend
pascal@19538 166 xor si,si ; A000 -9000 -0800(>movedend)
pascal@19515 167 rep
pascal@19515 168 movsb
pascal@20485 169 mov ax,[word _imgs+2+2] ; get pm->fallback high word
pascal@20484 170 push es
pascal@20484 171 call near @@isbzimage ; pop cs ; ds=es=ss
pascal@20477 172
pascal@20477 173 ; prepare memcpy32 size & srcofs param to move zImage pm
pascal@20477 174 mov dx,8
pascal@20477 175 cmp ax,dx ; buf > 80000h ?
pascal@20477 176 ja @@bufhigh
pascal@20477 177 sub dx,ax
pascal@20477 178 inc dx ; up to 90000h-1
pascal@20477 179 @@bufhigh:
pascal@20477 180 push dx ; size hi
pascal@20477 181 push cx ; size lo=up to 512k
pascal@20477 182 push ax ; src ofs ho = pm.fallback
pascal@20477 183
pascal@19538 184 ;in al,70h
pascal@19538 185 ;or al,80h ; disable NMI
pascal@19538 186 ;out 70h,al
pascal@20477 187
pascal@20485 188 xor di,di
pascal@20481 189 push di ; src ofs lo
pascal@20481 190 push di ; src seg=0
pascal@19636 191 ifdef NO386
pascal@20481 192 inc di
pascal@20481 193 push di ; dst ofs hi
pascal@20481 194 dec di
pascal@19636 195 else
pascal@20477 196 push 1 ; dst ofs hi
pascal@19636 197 endif
pascal@20481 198 push di ; dst ofs lo : 64k
pascal@19515 199 extrn _memcpy32:near
pascal@19515 200 call _memcpy32
pascal@19538 201 add sp,14
pascal@19515 202
pascal@19515 203 ifndef noelks
pascal@19515 204 ifndef NO386
pascal@19515 205 cmp [dword 1E6h],'SKLE'
pascal@20473 206 jne @@notelks
pascal@20481 207 xor si,si
pascal@19515 208 else
pascal@20481 209 mov si,1E6h
pascal@20481 210 lodsw
pascal@20481 211 cmp ax,'LE'
pascal@19905 212 jne @@notelks
pascal@20481 213 lodsw
pascal@20481 214 xor ax,'SK'
pascal@20473 215 jne @@notelks
pascal@20481 216 xchg ax,si
pascal@19515 217 endif
pascal@20481 218 push es
pascal@20481 219 pop ss
pascal@20481 220 mov cx,120h ; CS=0120
pascal@20481 221 push cx
pascal@20481 222 push si ; IP=0000
pascal@20481 223 mov cl,0 ; DS=ES=SS=0100
pascal@20475 224 mov es,cx
pascal@20475 225 mov ch,05h ; 500h mini
pascal@19515 226 rep
pascal@19515 227 movsw
pascal@19905 228 @@notelks:
pascal@19515 229 endif
pascal@19905 230 @@isbzimage:
pascal@19515 231 push ss
pascal@19515 232 pop ds
pascal@20475 233 push ss
pascal@20475 234 pop es
pascal@19636 235 ifndef NO386
pascal@19515 236 push ss
pascal@19515 237 pop fs
pascal@19515 238 push ss
pascal@19515 239 pop gs
pascal@19636 240 endif
pascal@19515 241 assume nothing
pascal@19515 242 assume cs:DGROUP
pascal@19515 243 retf
pascal@19515 244
pascal@20473 245 step19code
pascal@20477 246
pascal@20477 247 endp _boot_kernel
pascal@20477 248
pascal@19515 249 movedend:
pascal@19515 250
pascal@19515 251 ends _TEXT
pascal@19515 252
pascal@19515 253 end
pascal@19515 254
pascal@19515 255 ;###### END OF FILE ############################################