diff options
Diffstat (limited to 'bootblocks/i86_funcs.c')
| -rw-r--r-- | bootblocks/i86_funcs.c | 65 |
1 files changed, 59 insertions, 6 deletions
diff --git a/bootblocks/i86_funcs.c b/bootblocks/i86_funcs.c index dd9ec33..2112141 100644 --- a/bootblocks/i86_funcs.c +++ b/bootblocks/i86_funcs.c @@ -122,7 +122,6 @@ void mem_check() main_mem_top = 16384; return; /* If not standalone don't try */ #else - { #asm int 0x12 ! Amount of boot memory mov cl,#6 @@ -144,12 +143,66 @@ got_ext: mov [_main_mem_top],ax #endasm - } - if( main_mem_top == 0xFFFFL ) - { - /* It say 64Mb-1k - Hmmmm I think it might be 128! */ - } + /* Rest are big memory for 80386+ */ + if( x86 < 3 ) return; + + /* Try int $15 EAX=$E820 */ + { + struct e820_dat { + unsigned long base_lo, base_hi; + unsigned long len_lo, len_hi; + long addr_type; + } e820_item; + long epoll = 0; + + do + { + e820_item.addr_type = 0; +#asm + mov eax,#$E820 + mov ebx,.mem_check.epoll[bp] + mov ecx,#20 + mov edx,#$534D4150 + push ds + pop es + lea di,.mem_check.e820_item[bp] + int $15 + jnc got_e820 + xor ebx,ebx +got_e820: + mov .mem_check.epoll[bp],ebx +#endasm + if (e820_item.addr_type == 1 + && e820_item.base_hi == 0 + && e820_item.base_lo == 0x100000L) + { + /* XXX Later ... */ + if (e820_item.len_hi) main_mem_top = 0x40000; + else + main_mem_top = (e820_item.len_lo >> 10); + return; + } + } + while(epoll); + } + + /* Try int $15 EAX=$E801 */ + { + unsigned int mem_64, mem_16; /* For int $15,AX=$E801 */ +#asm + mov ax,#$E801 + int $15 + jc no_e801 + mov .mem_check.mem_16[bp],ax + mov .mem_check.mem_64[bp],bx +#endasm + main_mem_top = ((unsigned long)mem_64<<6) + mem_16; +#asm +no_e801: +#endasm + } + #endif } |