u32
getfakesysmemmap (u32 n, u64 *base, u64 *len, u32 *type)
{
u32 r;
r = getsysmemmap (n, base, len, type);
if (*type == SYSMEMMAP_TYPE_AVAILABLE) {
if (*base == realmodemem_base)
*len = realmodemem_fakelimit - realmodemem_base + 1;
if (*base == e820_vmm_base)
*len = e820_vmm_fake_len;
if (*base > e820_vmm_base && *base < e820_vmm_end)
*type = SYSMEMMAP_TYPE_RESERVED;
}
return r;
}
static void
install_int0x15_hook (void)
{
u64 int0x15_code, int0x15_data, int0x15_base;
u64 int0x15_vector_phys = 0x15 * 4;
int count, len1, len2, i;
struct e820_data *q;
u64 b1, l1, b2, l2;
u32 n, nn1, nn2;
u32 t1, t2;
void *p;
len1 = guest_int0x15_hook_end - guest_int0x15_hook;
int0x15_code = alloc_realmodemem (len1);
count = 0;
for (n = 0, nn1 = 1; nn1; n = nn1) {
nn1 = getfakesysmemmap (n, &b1, &l1, &t1);
nn2 = getsysmemmap (n, &b2, &l2, &t2);
if (nn1 == nn2 && b1 == b2 && l1 == l2 && t1 == t2)
continue;
count++;
}
len2 = count * sizeof (struct e820_data);
int0x15_data = alloc_realmodemem (len2);
if (int0x15_data > int0x15_code)
int0x15_base = int0x15_code;
else
int0x15_base = int0x15_data;
int0x15_base &= 0xFFFF0;
/* save old interrupt vector */
read_hphys_l (int0x15_vector_phys, &guest_int0x15_orig, 0);
/* write parameters properly */
guest_int0x15_e801_fake_ax = e801_fake_ax;
guest_int0x15_e801_fake_bx = e801_fake_bx;
guest_int0x15_e820_data_minus0x18 = int0x15_data - int0x15_base - 0x18;
guest_int0x15_e820_end = int0x15_data + len2 - int0x15_base;
/* copy the program code */
p = mapmem_hphys (int0x15_code, len1, MAPMEM_WRITE);
memcpy (p, guest_int0x15_hook, len1);
unmapmem (p, len1);
/* create e820_data */
q = mapmem_hphys (int0x15_data, len2, MAPMEM_WRITE);
i = 0;
for (n = 0, nn1 = 1; nn1; n = nn1) {
nn1 = getfakesysmemmap (n, &b1, &l1, &t1);
nn2 = getsysmemmap (n, &b2, &l2, &t2);
if (nn1 == nn2 && b1 == b2 && l1 == l2 && t1 == t2)
continue;
ASSERT (i < count);
q[i].n = n;
q[i].nn = nn1;
q[i].base = b1;
q[i].len = l1;
q[i].type = t1;
i++;
}
unmapmem (q, len2);
/* set interrupt vector */
write_hphys_l (int0x15_vector_phys, (int0x15_code - int0x15_base) |
(int0x15_base << 12), 0);
}