wok annotate linld/stuff/src/MEMTOP.ASM @ rev 25697

dool: reduced size of package
author Hans-G?nter Theisgen
date Sun May 12 07:10:04 2024 +0100 (3 weeks ago)
parents 6b6d14c9f7e9
children
rev   line source
pascal@19515 1 ;***************************************************************
pascal@19515 2 ;****** This file is distributed under GPL
pascal@19515 3 ;***************************************************************
pascal@19515 4 ideal
pascal@24034 5 %PAGESIZE 255
pascal@19515 6 %crefref
pascal@19515 7 %noincl
pascal@19515 8 %nomacs
pascal@24019 9
pascal@24019 10 include "common.inc"
pascal@24019 11
pascal@19636 12 ifdef NO386
pascal@19636 13 p8086
pascal@19636 14 else
pascal@19515 15 p386
pascal@19636 16 endif
pascal@19515 17
pascal@23983 18 group DGROUP _TEXT
pascal@19515 19 assume cs:DGROUP,ds:DGROUP
pascal@19515 20
pascal@19515 21
pascal@19515 22 segment _TEXT byte public use16 'CODE'
pascal@19515 23
pascal@19515 24 ;***************************************************************
pascal@24579 25 ;u32 memtop();
pascal@19515 26 ;***************************************************************
pascal@24579 27 global _memtop:near
pascal@24579 28 proc _memtop near
pascal@19515 29 ;***************************************************************
pascal@24015 30 ;u32 memtop_e820()
pascal@24015 31 ;***************************************************************
pascal@24015 32 ; proc _memtop_e820 near
pascal@24015 33
pascal@24015 34 ifdef INT15_E820
pascal@24015 35
pascal@24015 36 struc e820 ;struct e820 {
pascal@24015 37 base dd ?,? ; 0 u64 base;
pascal@24015 38 length dd ?,? ; 8 u64 length;
pascal@24015 39 type db ?,?,?,? ;16 u32 type; 1=available
pascal@24015 40 ends e820 ;};
pascal@24015 41
pascal@24015 42 p386
pascal@24015 43 push ds
pascal@24015 44 pop es
pascal@24015 45 push di
pascal@24015 46 xor ebx,ebx
pascal@24015 47 @@e820lp:
pascal@24015 48 mov eax,0E820h
pascal@24015 49 mov edx,534D4150h ; 'SMAP'
pascal@24015 50 xor ecx,ecx
pascal@24015 51 mov cl,size e820
pascal@24015 52 extrn buf4k:byte
pascal@24015 53 mov di,offset buf4k
pascal@24015 54 int 15h
pascal@24015 55 jc @@err_e820
pascal@24015 56 ;cmp eax,534D4150h ; 'SMAP'
pascal@24015 57 ;jne @@err_e820
pascal@24015 58 cmp [(e820 di).type],1
pascal@24015 59 jnz @@notavail
pascal@24015 60 mov eax,[(e820 di).base]
pascal@24015 61 add eax,[(e820 di).length]
pascal@24015 62 push eax
pascal@24015 63 pop ax
pascal@24015 64 pop dx
pascal@24015 65 or dh,dh ; > 16M
pascal@24015 66 je @@notavail
pascal@24015 67 pop di
pascal@24015 68 ret
pascal@24015 69 @@notavail:
pascal@24015 70 or bx,bx
pascal@24015 71 jne @@e820lp
pascal@24015 72 @@err_e820:
pascal@24015 73 pop di
pascal@24015 74 endif
pascal@24015 75
pascal@24015 76 ; endp _memtop_e820
pascal@24015 77
pascal@24015 78 ;***************************************************************
pascal@19515 79 ;u32 memtop_e801()
pascal@19515 80 ;***************************************************************
pascal@19515 81 ; proc _memtop_e801 near
pascal@19515 82
pascal@19515 83 xor cx,cx ;fix to work around buggy
pascal@19515 84 xor dx,dx ; BIOSes which dont clear/set
pascal@24015 85 mov ax,0E801h ;ax=1kbs in 1-16M bx=64kbs above 16M extended
pascal@24015 86 int 15h ;cx=1kbs in 1-16M dx=64kbs above 16M configured
pascal@20453 87 xchg ax,cx ;kludge to handle BIOSes
pascal@20453 88 jcxz @@use_cxdx ; which report their extended
pascal@20453 89 ; memory in AX/BX rather than
pascal@20453 90 ; CX/DX. The spec I have read
pascal@19515 91 @@use_axbx: mov dx,bx ; seems to indicate AX/BX
pascal@19882 92 xchg ax,cx ; are more reasonable anyway...
pascal@20453 93 @@use_cxdx: ;now: dx=64k units above 16m
pascal@20453 94 ; ax=1k units above 1m below 16m (max 3c00h)
pascal@20510 95 or dx,dx
pascal@24015 96 jz @@below16M
pascal@19515 97 xor ax,ax ;ignore info on low 16M (assume full)
pascal@24015 98 inc dh ;account for low 16M
pascal@19515 99 ret
pascal@24015 100 @@below16M:
pascal@24015 101 or ax,ax
pascal@24015 102 jnz tokb ;dx=0 here, ax=kbs above 1m
pascal@19515 103 @@err:
pascal@19515 104 ; ret
pascal@19515 105 ; endp _memtop_e801
pascal@19515 106
pascal@19515 107
pascal@19515 108 ;***************************************************************
pascal@19515 109 ;u32 memtop_88()
pascal@19515 110 ;***************************************************************
pascal@19515 111 ; proc _memtop_88 near
pascal@19515 112
pascal@19515 113 mov ah,88h
pascal@19515 114 int 15h ;ax=kbs above 1m
pascal@24015 115 test ax,ax ; error: ax=0
pascal@20142 116 jnz tokb ;happens on big mem systems
pascal@19879 117
pascal@19879 118 ;***************************************************************
pascal@19879 119 ;u32 memtop_cmos()
pascal@19879 120 ;***************************************************************
pascal@19879 121
pascal@19879 122 ;memtop_cmos:
pascal@19879 123 pushf
pascal@19879 124 call rdcmos17
pascal@19879 125 popf
pascal@19515 126 tokb:
pascal@21757 127 mov cl,10 ;multiply by 1024
pascal@21757 128 ifndef NO386
pascal@21757 129 add ah,4h ;account for 1024 low kb
pascal@21757 130 setc dl ; (optimized to death)
pascal@21757 131 shld dx,ax,cl
pascal@21757 132 shl ax,cl ; (kbytes -> bytes)
pascal@21791 133 ret
pascal@21757 134 else
pascal@19634 135 xor dx,dx
pascal@19515 136 add ah,4h ;account for 1024 low kb
pascal@19515 137 adc dx,dx ; (optimized to death)
pascal@21791 138 db 0A9h ; test ax,0C28Ch
pascal@21791 139 global N_LXLSH@ES:near
pascal@21791 140 N_LXLSH@ES:
pascal@21791 141 mov dx,es
pascal@20142 142 global N_LXLSH@:near
pascal@20142 143 N_LXLSH@:
pascal@19883 144 mov ch,0
pascal@19515 145 @@lp:
pascal@19883 146 shl ax,1
pascal@19515 147 rcl dx,1
pascal@19515 148 loop @@lp
pascal@21791 149 ret
pascal@21791 150 global N_LXLSH@4:near
pascal@21791 151 N_LXLSH@4:
pascal@21791 152 xor dx,dx
pascal@21791 153 mov cl,4
pascal@21791 154 jmp N_LXLSH@
pascal@19515 155 endif
pascal@19883 156
pascal@19515 157 ; endp _memtop_88
pascal@19515 158
pascal@24579 159 ; proc _memtop near
pascal@19515 160
pascal@19515 161 ; call _memtop_e801
pascal@19515 162 ; jnz @@ok
pascal@19515 163 ; call _memtop_88
pascal@19515 164 ; jnz @@ok
pascal@19879 165 ; jmp memtop_cmos
pascal@19515 166
pascal@20142 167 rdcmos17: cli
pascal@20142 168 mov al,18h ; read bytes 17-18 from CMOS
pascal@19515 169 call @@rdcmos
pascal@19515 170 mov ah,al
pascal@19515 171 mov al,17h
pascal@19515 172 @@rdcmos: out 70h,al
pascal@19515 173 call @@ret
pascal@19515 174 in al,71h
pascal@19515 175 @@ret:
pascal@19515 176 ret
pascal@19515 177
pascal@19515 178
pascal@19515 179 ;***************************************************************
pascal@24579 180 ;u32 topload();
pascal@19515 181 ;***************************************************************
pascal@24579 182 global _topload:near
pascal@24579 183 _topload:
pascal@24579 184 call _memtop
pascal@19515 185 mov cx,40h ; min 4m
pascal@19515 186 ; If reported mem is ridiculously low, presume
pascal@19515 187 ; we had trouble detecting memory size
pascal@19515 188 cmp dx,cx
pascal@19515 189 jb @@set
pascal@23996 190 extrn _cmdnum:dword
pascal@23996 191 _topmem = _cmdnum+8
pascal@20528 192 mov cx,[word _topmem+2]
pascal@20528 193 inc cx ; jcxnz
pascal@20528 194 loop @@topmemset
pascal@20528 195 mov ch,10h ; default = max 256m
pascal@20528 196 @@topmemset:
pascal@19515 197 ; Kernel can have trouble with initrd at very high addr:
pascal@19515 198 ; limit mem top to 256m
pascal@19515 199 cmp dh,ch
pascal@19515 200 jb @@done
pascal@19515 201 @@set:
pascal@19515 202 xchg ax,cx
pascal@19515 203 cwd
pascal@19515 204 xchg ax,dx
pascal@19515 205 @@done:
pascal@19515 206 ; Round down to page boundary.
pascal@19515 207 ; Or else initrd's tail may end up in last, partial page.
pascal@19515 208 ; Kernel will refuse to use such initrd.
pascal@19515 209 and ax,0f000h
pascal@19515 210 ;@@ok:
pascal@19515 211 ret
pascal@19515 212
pascal@24579 213 endp _memtop
pascal@19515 214
pascal@19515 215 ;***************************************************************
pascal@19515 216 ;void hook_int15_88();
pascal@19515 217 ;***************************************************************
pascal@19515 218 global _hook_int15_88:near
pascal@19515 219 proc _hook_int15_88 near
pascal@19515 220
pascal@19515 221 ifndef xmm_hook
pascal@24013 222 ;mov ax,4300h
pascal@24013 223 ;int 2fh
pascal@24013 224 ;cmp al,80h ; 80h = XMS driver installed
pascal@24013 225 ;je @@skip
pascal@19515 226 endif
pascal@23983 227 saved15:
pascal@19883 228 xor bx,bx
pascal@19883 229 mov es,bx
pascal@19571 230 ifndef NO386
pascal@19876 231 push cs
pascal@19876 232 push offset int15_88
pascal@19876 233 pop eax
pascal@19883 234 xchg eax,[es:bx+15*4]
pascal@23983 235 mov [dword saved15],eax
pascal@19515 236 else
pascal@19876 237 mov ax,offset int15_88
pascal@23996 238 call saved15z
pascal@23996 239 mov ax,cs
pascal@23996 240 inc bx
pascal@23996 241 inc bx
pascal@23996 242 saved15z:
pascal@19883 243 xchg ax,[es:bx+15*4]
pascal@23996 244 mov [word bx+saved15],ax
pascal@19515 245 endif
pascal@21757 246 ;push ds
pascal@21757 247 ;pop es
pascal@19515 248 @@skip:
pascal@19515 249 ret
pascal@19515 250 int15_88:
pascal@19515 251 cmp ah,88h
pascal@19515 252 je @@do88
pascal@23983 253 jmp [dword saved15]
pascal@19515 254 @@do88:
pascal@19515 255 pushf
pascal@23983 256 call [dword saved15]
pascal@20510 257 or ax,ax
pascal@19515 258 jnz @@iret
pascal@19515 259
pascal@19515 260 ;****** Read extended mem size (CMOS bytes 17h,18h (lo,hi))
pascal@19515 261 call rdcmos17
pascal@19515 262 @@iret:
pascal@19515 263 iret
pascal@19515 264
pascal@19515 265 endp _hook_int15_88
pascal@19515 266
pascal@19515 267 ends _TEXT
pascal@19515 268
pascal@19515 269 end
pascal@19515 270
pascal@19515 271 ;###### END OF FILE ############################################