wok annotate linld/stuff/src/MEMTOP.ASM @ rev 20451

Add python-click python-itsdangerous & python-flask
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sat Sep 29 15:27:00 2018 +0200 (2018-09-29)
parents 04feaffdc0d9
children 46b511e941a7
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@20451 14 group DGROUP _TEXT,_BSS
pascal@19515 15 assume cs:DGROUP,ds:DGROUP
pascal@19515 16
pascal@19515 17
pascal@19515 18 segment _BSS byte public use16 'BSS'
pascal@19515 19
pascal@19515 20 saved15 dd ?
pascal@19515 21
pascal@19515 22 ends _BSS
pascal@19515 23
pascal@19515 24
pascal@19515 25 segment _TEXT byte public use16 'CODE'
pascal@19515 26
pascal@19515 27 ;***************************************************************
pascal@19515 28 ;u32 memtopz();
pascal@19515 29 ;***************************************************************
pascal@19515 30 global _memtopz:near
pascal@19515 31 proc _memtopz near
pascal@19515 32 ;***************************************************************
pascal@19515 33 ;u32 memtop_e801()
pascal@19515 34 ;***************************************************************
pascal@19515 35 ; proc _memtop_e801 near
pascal@19515 36
pascal@19515 37 xor cx,cx ;fix to work around buggy
pascal@19515 38 xor dx,dx ; BIOSes which dont clear/set
pascal@19515 39 stc ; carry on pass/error of
pascal@19515 40 mov ax,0E801h
pascal@19515 41 int 15h
pascal@19515 42 jc @@err
pascal@19882 43 xchg ax,cx
pascal@19882 44 push ax ;kludge to handle BIOSes
pascal@19882 45 or ax,dx ; which report their extended
pascal@19882 46 pop ax ; memory in AX/BX rather than
pascal@19515 47 jnz @@use_cxdx ; CX/DX. The spec I have read
pascal@19515 48 @@use_axbx: mov dx,bx ; seems to indicate AX/BX
pascal@19882 49 xchg ax,cx ; are more reasonable anyway...
pascal@19882 50 @@use_cxdx: ;now: dx=64k units above 16m
pascal@19515 51 ; ax=1k units above 1m below 16m (max 3c00h)
pascal@19515 52 test dx,dx
pascal@19515 53 jz tokb ;dx=0 here, ax=kbs above 1m
pascal@19515 54 xor ax,ax ;ignore info on low 16M (assume full)
pascal@19515 55 ;add dx,100h ;account for low 16M
pascal@19515 56 inc dh ;account for low 16M (optimized)
pascal@19515 57 ret
pascal@19515 58 @@err:
pascal@19515 59 ; xor ax,ax
pascal@19515 60 ; cwd
pascal@19515 61 ; ret
pascal@19515 62 ; endp _memtop_e801
pascal@19515 63
pascal@19515 64
pascal@19515 65 ;***************************************************************
pascal@19515 66 ;u32 memtop_88()
pascal@19515 67 ;***************************************************************
pascal@19515 68 ; proc _memtop_88 near
pascal@19515 69
pascal@19515 70 mov ah,88h
pascal@19515 71 int 15h ;ax=kbs above 1m
pascal@20142 72 cmc ; error: cf=1 or ax=0
pascal@20142 73 sbb dx,dx
pascal@20142 74 and ax,dx ;
pascal@20142 75 jnz tokb ;happens on big mem systems
pascal@19879 76
pascal@19879 77 ;***************************************************************
pascal@19879 78 ;u32 memtop_cmos()
pascal@19879 79 ;***************************************************************
pascal@19879 80
pascal@19879 81 ;memtop_cmos:
pascal@19879 82 pushf
pascal@19879 83 call rdcmos17
pascal@19879 84 popf
pascal@19515 85 tokb:
pascal@19634 86 xor dx,dx
pascal@19515 87 add ah,4h ;account for 1024 low kb
pascal@19515 88 adc dx,dx ; (optimized to death)
pascal@19883 89 mov cl,10 ;multiply by 1024
pascal@19515 90 ifndef NO386
pascal@19883 91 shld dx,ax,cl
pascal@19883 92 shl ax,cl ; (kbytes -> bytes)
pascal@19515 93 else
pascal@20142 94 global N_LXLSH@:near
pascal@20142 95 N_LXLSH@:
pascal@19883 96 mov ch,0
pascal@19515 97 @@lp:
pascal@19883 98 shl ax,1
pascal@19515 99 rcl dx,1
pascal@19515 100 loop @@lp
pascal@19515 101 endif
pascal@19883 102 ret
pascal@19883 103
pascal@19515 104 ; endp _memtop_88
pascal@19515 105
pascal@19884 106 ifdef NO386
pascal@19884 107 global N_LXURSH@:near
pascal@19884 108 global N_LXURSH@4:near
pascal@19884 109 ; proc N_LXURSH@4 near
pascal@19884 110 N_LXURSH@4:
pascal@19884 111 mov cl,4
pascal@19884 112 N_LXURSH@:
pascal@19884 113 mov ch,0
pascal@19884 114 @@loop:
pascal@19884 115 shr dx,1
pascal@19884 116 rcr ax,1
pascal@19884 117 loop @@loop
pascal@19884 118 ret
pascal@19884 119
pascal@19884 120 ; endp N_LXURSH@4
pascal@19884 121
pascal@19884 122 endif
pascal@19884 123
pascal@19884 124
pascal@19515 125 ; proc _memtopz near
pascal@19515 126
pascal@19515 127 ; call _memtop_e801
pascal@19515 128 ; jnz @@ok
pascal@19515 129 ; call _memtop_88
pascal@19515 130 ; jnz @@ok
pascal@19879 131 ; jmp memtop_cmos
pascal@19515 132
pascal@20142 133 rdcmos17: cli
pascal@20142 134 mov al,18h ; read bytes 17-18 from CMOS
pascal@19515 135 call @@rdcmos
pascal@19515 136 mov ah,al
pascal@19515 137 mov al,17h
pascal@19515 138 @@rdcmos: out 70h,al
pascal@19515 139 call @@ret
pascal@19515 140 in al,71h
pascal@19515 141 @@ret:
pascal@19515 142 ret
pascal@19515 143
pascal@19515 144
pascal@19515 145 ;***************************************************************
pascal@19515 146 ;u32 memtop();
pascal@19515 147 ;***************************************************************
pascal@19515 148 global _memtop:near
pascal@19515 149 _memtop:
pascal@19515 150 call _memtopz
pascal@19515 151 mov cx,40h ; min 4m
pascal@19515 152 ; If reported mem is ridiculously low, presume
pascal@19515 153 ; we had trouble detecting memory size
pascal@19515 154 cmp dx,cx
pascal@19515 155 jb @@set
pascal@20451 156 extrn _topmem:dword
pascal@19515 157 mov cx,[word _topmem+2] ; max 256m ?
pascal@19515 158 ; Kernel can have trouble with initrd at very high addr:
pascal@19515 159 ; limit mem top to 256m
pascal@19515 160 cmp dh,ch
pascal@19515 161 jb @@done
pascal@19515 162 @@set:
pascal@19515 163 xchg ax,cx
pascal@19515 164 cwd
pascal@19515 165 xchg ax,dx
pascal@19515 166 @@done:
pascal@19515 167 ; Round down to page boundary.
pascal@19515 168 ; Or else initrd's tail may end up in last, partial page.
pascal@19515 169 ; Kernel will refuse to use such initrd.
pascal@19515 170 and ax,0f000h
pascal@19515 171 ;@@ok:
pascal@19515 172 ret
pascal@19515 173
pascal@19515 174 endp _memtopz
pascal@19515 175
pascal@19515 176 ;***************************************************************
pascal@19515 177 ;void hook_int15_88();
pascal@19515 178 ;***************************************************************
pascal@19515 179 global _hook_int15_88:near
pascal@19515 180 proc _hook_int15_88 near
pascal@19515 181
pascal@19515 182 ifndef xmm_hook
pascal@19515 183 mov ax,4300h
pascal@19515 184 int 2fh
pascal@19571 185 cmp al,80h ; 80h = XMS driver installed
pascal@19515 186 je @@skip
pascal@19515 187 endif
pascal@19883 188 xor bx,bx
pascal@19883 189 mov es,bx
pascal@19571 190 ifndef NO386
pascal@19876 191 push cs
pascal@19876 192 push offset int15_88
pascal@19876 193 pop eax
pascal@19883 194 xchg eax,[es:bx+15*4]
pascal@19515 195 mov [saved15],eax
pascal@19515 196 else
pascal@19876 197 mov ax,offset int15_88
pascal@19883 198 xchg ax,[es:bx+15*4]
pascal@19515 199 mov [word saved15],ax
pascal@19876 200 mov ax,cs
pascal@19883 201 xchg ax,[es:bx+15*4+2]
pascal@19515 202 mov [word saved15+2],ax
pascal@19515 203 endif
pascal@19515 204 @@skip:
pascal@19515 205 ret
pascal@19515 206 int15_88:
pascal@19515 207 cmp ah,88h
pascal@19515 208 je @@do88
pascal@19876 209 @@jmp_saved15:
pascal@19515 210 jmp [saved15]
pascal@19515 211 @@do88:
pascal@19515 212 pushf
pascal@19876 213 call @@jmp_saved15
pascal@19515 214 test ax,ax
pascal@19515 215 jnz @@iret
pascal@19515 216
pascal@19515 217 ;****** Read extended mem size (CMOS bytes 17h,18h (lo,hi))
pascal@19515 218 call rdcmos17
pascal@19515 219 @@iret:
pascal@19515 220 iret
pascal@19515 221
pascal@19515 222 endp _hook_int15_88
pascal@19515 223
pascal@19515 224 ends _TEXT
pascal@19515 225
pascal@19515 226 end
pascal@19515 227
pascal@19515 228 ;###### END OF FILE ############################################