wok view linld/stuff/src/JUMP.ASM @ rev 20510
Up acl-dev (2.2.53)
| author | Pascal Bellard <pascal.bellard@slitaz.org> |
|---|---|
| date | Wed Oct 31 15:13:42 2018 +0100 (2018-10-31) |
| parents | 81a3d87e0965 |
| children | d7919052f62f |
line source
1 ;***************************************************************
2 ;****** This file is distributed under GPL
3 ;***************************************************************
4 ideal
5 %crefref
6 %noincl
7 %nomacs
8 ifdef NO386
9 p8086
10 else
11 p386
12 endif
14 group DGROUP _TEXT,_DATA,_BSS
15 assume cs:DGROUP,ds:DGROUP
17 segment _DATA byte public use16 'DATA'
19 overflow db "Loaded too close to 9000:0",0
21 ends _DATA
23 segment _BSS byte public use16 'BSS'
25 global _imgs:dword
27 ends _BSS
30 segment _TEXT byte public use16 'CODE'
32 ;***************************************************************
33 ;void dos_shutdown()
34 ;***************************************************************
36 macro dos_shutdown
37 xor di,di
38 mov ds,di
39 ifndef NO386
40 push [dword di+4] ; save step
41 mov [word di+4],offset step19
42 else
43 mov ax,offset step19
44 xchg ax,[word di+4]
45 push [word di+6]
46 push ax ; save step
47 endif
48 mov [word cs:sssp],sp
49 ;cmp [byte di+7],0F0h
50 ;jnc notdos
51 mov [di+6],cs
52 pushf
53 pushf
54 pop ax
55 inc ah ; set TF
56 push ax
57 popf
58 call [dword di+4*19h]
59 notdos:
60 ifndef NO386
61 lss sp,[dword cs:sssp]
62 else
63 lds ax,[dword cs:sssp]
64 push ds
65 pop ss
66 xchg ax,sp
67 endif
68 xor di,di
69 mov ds,di
70 pop [dword di+4] ; restore step
71 endm
72 macro step19code
73 step19:
74 push di
75 push ds
76 mov di,sp
77 lds di,[dword ss:di+4] ; read cs:ip
78 cmp [word di],19CDh ; int 19h ?
79 pop ds
80 pop di
81 je notdos
82 iret
83 endm
86 ;***************************************************************
87 ;void boot_kernel();
88 ;****** Never returns
89 ;***************************************************************
90 global _boot_kernel:near
91 proc _boot_kernel near
93 p8086
94 extrn _heap_top:word
95 global sssp
96 ifdef NO386
97 sssp:
98 extrn _topseg:near
99 call near _topseg
100 mov cl,4
101 mov [word sssp+2],ax
102 xchg ax,bx
103 mov ax,[_heap_top]
104 shr ax,cl
105 else
106 p386
107 mov ax,[_heap_top]
108 ;shr ax,4
109 db 0C1h,0E8h
110 sssp:
111 db 4
112 mov bx,9000h
113 endif
114 mov es,bx
115 mov dx,cs
116 add ax,dx
117 cmp ax,bx
118 jb @@nooverflow
119 ; Oops! We can stomp on our toes... better stop now
120 mov bx,offset overflow
121 extrn die:near
122 call near die
123 @@nooverflow:
124 ;cli ; we start doing destructive things to DOS
125 push es
126 pop ss
127 mov sp,0A000h
128 extrn _csip:dword
129 push [dword _csip]
130 extrn _rm_size:word
131 mov si,offset _rm_size ; _rm_size, _pm_high, _rm_buf
132 lodsw
133 xchg ax,cx ; _rm_size
134 lodsb ; _pm_high
135 mov si,[si] ; _rm_buf
136 xor di,di
137 ;cld
138 rep
139 movsb
140 extrn _cmdline:word
141 mov si,[_cmdline]
142 mov di,8000h
143 mov ch,10h ; 4k
144 rep
145 movsb
146 ifdef NO386
147 add bh,9
148 push bx ; topseg()+0x0900
149 else
150 push 9800h+(4096/16) ; 4096 bytes for cmdline
151 endif
152 cmp al,cl ; load high ?
153 pushf
154 ; finish loading
155 extrn @last_ditch$qv:near
156 call @last_ditch$qv
157 dos_shutdown ; clear di; ds=0
158 push cs
159 pop ds
160 popf
161 ; self move
162 ;cld
163 pop es ; min 2048 bytes for stack
164 jne @@isbzimage
165 mov cx,offset movedend
166 xor si,si ; A000 -9000 -0800(>movedend)
167 rep
168 movsb
169 mov ax,[word _imgs+2+2] ; get pm->fallback high word
170 push es
171 call near @@isbzimage ; pop cs ; ds=es=ss
173 ; prepare memcpy32 size & srcofs param to move zImage pm
174 mov dx,8
175 cmp ax,dx ; buf > 80000h ?
176 ja @@bufhigh
177 sub dx,ax
178 inc dx ; up to 90000h-1
179 @@bufhigh:
180 push dx ; size hi
181 push cx ; size lo=up to 512k
182 push ax ; src ofs ho = pm.fallback
184 ;in al,70h
185 ;or al,80h ; disable NMI
186 ;out 70h,al
188 xor di,di
189 push di ; src ofs lo
190 push di ; src seg=0
191 ifdef NO386
192 inc di
193 push di ; dst ofs hi
194 dec di
195 else
196 push 1 ; dst ofs hi
197 endif
198 push di ; dst ofs lo : 64k
199 extrn _memcpy32:near
200 call _memcpy32
201 add sp,14
203 ifndef noelks
204 ifndef NO386
205 cmp [dword 1E6h],'SKLE'
206 jne @@notelks
207 xor si,si
208 else
209 mov si,1E6h
210 lodsw
211 cmp ax,'LE'
212 jne @@notelks
213 lodsw
214 xor ax,'SK'
215 jne @@notelks
216 xchg ax,si
217 endif
218 push es
219 pop ss
220 mov cx,120h ; CS=0120
221 push cx
222 push si ; IP=0000
223 mov cl,0 ; DS=ES=SS=0100
224 mov es,cx
225 mov ch,05h ; 500h mini
226 rep
227 movsw
228 @@notelks:
229 endif
230 @@isbzimage:
231 push ss
232 pop ds
233 push ss
234 pop es
235 ifndef NO386
236 push ss
237 pop fs
238 push ss
239 pop gs
240 endif
241 assume nothing
242 assume cs:DGROUP
243 retf
245 step19code
247 endp _boot_kernel
249 movedend:
251 ends _TEXT
253 end
255 ;###### END OF FILE ############################################