81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
#include <u.h>
|
|
#include "dat.h"
|
|
#include "fn.h"
|
|
|
|
#define IOMEM_BEGIN 0x0A0000
|
|
#define IOMEM_END 0x100000
|
|
|
|
enum{
|
|
MAP_END = 0x00,
|
|
MAP_FREE = 0x01,
|
|
MAP_RES = 0x02,
|
|
MAP_ACPI_RECLAM = 0x03,
|
|
MAP_ACPI_NVS = 0x04,
|
|
};
|
|
|
|
static BIOSmmap*
|
|
int15_E820(BIOSmmap *m)
|
|
{
|
|
int rc, sig, off = 0;
|
|
do{
|
|
BIOSreg.es = ((uint)(m) >> 4);
|
|
__asm volatile("int $0x35; setc %b1"
|
|
: "=a" (sig), "=d" (rc), "=b" (off)
|
|
: "0" (0xE820), "1" (0x534d4150), "b" (off),
|
|
"c" (sizeof(*m)), "D" (((uint)m) & 0xf)
|
|
: "cc", "memory");
|
|
|
|
off = BIOSreg.bx;
|
|
if(rc &0xff || sig !=0x534d4150){
|
|
break;
|
|
if(m->type == 0)
|
|
m->type = MAP_RES;
|
|
}
|
|
m++;
|
|
}while(off);
|
|
return m;
|
|
}
|
|
|
|
static void
|
|
dumpmem(BIOSmmap *m)
|
|
{
|
|
ulong tot = 0;
|
|
|
|
for(BIOSmmap *p=m; p->type != MAP_END; ++p){
|
|
print("MEM % 2ud type %ud size % 10udKB at %08x:%08x\n",
|
|
p-m, p->type, (uint)(p->size/1024), (uint)(p->addr>>32), (uint)p->addr);
|
|
if(p->type == MAP_FREE)
|
|
tot += p->size/1024;
|
|
}
|
|
print("RAM low:%udKB high:%udKB\n", cnvmem, extmem);
|
|
print("Total free memory: %udKB\n", tot);
|
|
}
|
|
|
|
static int
|
|
isa20done(void)
|
|
{
|
|
register char *a = (char *)0x100000;
|
|
register char *b = (char *)0x000000;
|
|
|
|
return *a != *b;
|
|
}
|
|
|
|
void
|
|
memprobe(void)
|
|
{
|
|
BIOSmmap *m;
|
|
|
|
cnvmem = extmem = 0;
|
|
m = int15_E820(biosmmap);
|
|
m->type = MAP_END;
|
|
for(m = biosmmap; m->type != MAP_END; ++m){
|
|
if(m->type != MAP_FREE || m->size <= 0)
|
|
continue;
|
|
if(m->addr < IOMEM_BEGIN)
|
|
cnvmem = MAX(cnvmem, m->addr + m->size)/1024;
|
|
if(m->addr >= IOMEM_END)
|
|
extmem += m->size/1024;
|
|
}
|
|
dumpmem(biosmmap);
|
|
print("A20:%s\n", isa20done() ? "ok" : "no");
|
|
} |