/*
* Bolt the kernel addr space into the HPT
*/
static void __init iSeries_bolt_kernel(unsigned long saddr, unsigned long eaddr)
{
unsigned long pa;
unsigned long mode_rw = _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX;
HPTE hpte;
for (pa = saddr; pa < eaddr ;pa += PAGE_SIZE) {
unsigned long ea = (unsigned long)__va(pa);
unsigned long vsid = get_kernel_vsid(ea);
unsigned long va = (vsid << 28) | (pa & 0xfffffff);
unsigned long vpn = va >> PAGE_SHIFT;
unsigned long slot = HvCallHpt_findValid(&hpte, vpn);
/* Make non-kernel text non-executable */
if (!in_kernel_text(ea))
mode_rw |= HW_NO_EXEC;
if (hpte.dw0.dw0.v) {
/* HPTE exists, so just bolt it */
HvCallHpt_setSwBits(slot, 0x10, 0);
/* And make sure the pp bits are correct */
HvCallHpt_setPp(slot, PP_RWXX);
} else
/* No HPTE exists, so create a new bolted one */
iSeries_make_pte(va, phys_to_abs(pa), mode_rw);
}
}
long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
unsigned long pa, unsigned long rflags,
unsigned long vflags, int psize)
{
long slot;
struct hash_pte lhpte;
int secondary = 0;
BUG_ON(psize != MMU_PAGE_4K);
/*
* The hypervisor tries both primary and secondary.
* If we are being called to insert in the secondary,
* it means we have already tried both primary and secondary,
* so we return failure immediately.
*/
if (vflags & HPTE_V_SECONDARY)
return -1;
iSeries_hlock(hpte_group);
slot = HvCallHpt_findValid(&lhpte, va >> HW_PAGE_SHIFT);
if (unlikely(lhpte.v & HPTE_V_VALID)) {
if (vflags & HPTE_V_BOLTED) {
HvCallHpt_setSwBits(slot, 0x10, 0);
HvCallHpt_setPp(slot, PP_RWXX);
iSeries_hunlock(hpte_group);
if (slot < 0)
return 0x8 | (slot & 7);
else
return slot & 7;
}
BUG();
}
if (slot == -1) { /* No available entry found in either group */
iSeries_hunlock(hpte_group);
return -1;
}
if (slot < 0) { /* MSB set means secondary group */
vflags |= HPTE_V_SECONDARY;
secondary = 1;
slot &= 0x7fffffffffffffff;
}
lhpte.v = hpte_encode_v(va, MMU_PAGE_4K) | vflags | HPTE_V_VALID;
lhpte.r = hpte_encode_r(phys_to_abs(pa), MMU_PAGE_4K) | rflags;
/* Now fill in the actual HPTE */
HvCallHpt_addValidate(slot, secondary, &lhpte);
iSeries_hunlock(hpte_group);
return (secondary << 3) | (slot & 7);
}
/*
* Update the page protection bits. Intended to be used to create
* guard pages for kernel data structures on pages which are bolted
* in the HPT. Assumes pages being operated on will not be stolen.
* Does not work on large pages.
*
* No need to lock here because we should be the only user.
*/
static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea)
{
unsigned long vsid,va,vpn;
long slot;
vsid = get_kernel_vsid(ea);
va = (vsid << 28) | (ea & 0x0fffffff);
vpn = va >> PAGE_SHIFT;
slot = iSeries_hpte_find(vpn);
if (slot == -1)
panic("updateboltedpp: Could not find page to bolt\n");
HvCallHpt_setPp(slot, newpp);
}
/*
* The HyperVisor expects the "flags" argument in this form:
* bits 0..59 : reserved
* bit 60 : N
* bits 61..63 : PP2,PP1,PP0
*/
static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
unsigned long va, int large, int local)
{
HPTE hpte;
unsigned long avpn = va >> 23;
iSeries_hlock(slot);
HvCallHpt_get(&hpte, slot);
if ((hpte.dw0.dw0.avpn == avpn) && (hpte.dw0.dw0.v)) {
HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
iSeries_hunlock(slot);
return 0;
}
iSeries_hunlock(slot);
return -1;
}
/*
* The HyperVisor expects the "flags" argument in this form:
* bits 0..59 : reserved
* bit 60 : N
* bits 61..63 : PP2,PP1,PP0
*/
static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
unsigned long va, int psize, int local)
{
struct hash_pte hpte;
unsigned long want_v;
iSeries_hlock(slot);
HvCallHpt_get(&hpte, slot);
want_v = hpte_encode_v(va, MMU_PAGE_4K);
if (HPTE_V_COMPARE(hpte.v, want_v) && (hpte.v & HPTE_V_VALID)) {
/*
* Hypervisor expects bits as NPPP, which is
* different from how they are mapped in our PP.
*/
HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
iSeries_hunlock(slot);
return 0;
}
iSeries_hunlock(slot);
return -1;
}