| biosmem.c (43561) | biosmem.c (53207) |
|---|---|
| 1/* 2 * mjs copyright | 1/* 2 * mjs copyright |
| 3 * 4 * $FreeBSD: head/sys/boot/pc98/libpc98/biosmem.c 53207 1999-11-16 00:42:18Z nyan $ |
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| 3 */ 4 5/* 6 * Obtain memory configuration information from the BIOS 7 * 8 * Note that we don't try too hard here; knowing the size of 9 * base memory and extended memory out to 16 or 64M is enough for 10 * the requirements of the bootstrap. --- 25 unchanged lines hidden (view full) --- 36 37/* 38 * Return extended memory size in kB 39 */ 40int 41getextmem(void) 42{ 43 int extkb; | 5 */ 6 7/* 8 * Obtain memory configuration information from the BIOS 9 * 10 * Note that we don't try too hard here; knowing the size of 11 * base memory and extended memory out to 16 or 64M is enough for 12 * the requirements of the bootstrap. --- 25 unchanged lines hidden (view full) --- 38 39/* 40 * Return extended memory size in kB 41 */ 42int 43getextmem(void) 44{ 45 int extkb; |
| 44 | 46 |
| 45#ifdef PC98 46 extkb = *(u_char *)PTOV(0xA1401)*128 + *(unsigned short *)PTOV(0xA1594)*1024; 47#else 48 v86.ctl = 0; 49 v86.addr = 0x15; /* int 0x15 function 0x88*/ 50 v86.eax = 0x8800; 51 v86int(); 52 extkb = v86.eax & 0xffff; 53#endif | 47#ifdef PC98 48 extkb = *(u_char *)PTOV(0xA1401)*128 + *(unsigned short *)PTOV(0xA1594)*1024; 49#else 50 v86.ctl = 0; 51 v86.addr = 0x15; /* int 0x15 function 0x88*/ 52 v86.eax = 0x8800; 53 v86int(); 54 extkb = v86.eax & 0xffff; 55#endif |
| 56 |
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| 54 /* Set memtop to actual top or 16M, whicheve is less */ 55 memtop = min((0x100000 + (extkb * 1024)), (16 * 1024 * 1024)); 56 57 return(extkb); 58} 59 | 57 /* Set memtop to actual top or 16M, whicheve is less */ 58 memtop = min((0x100000 + (extkb * 1024)), (16 * 1024 * 1024)); 59 60 return(extkb); 61} 62 |