29,11 → 29,268 |
#include <arch/mm/page.h> |
#include <genarch/mm/page_pt.h> |
#include <arch/mm/frame.h> |
#include <arch/asm.h> |
#include <mm/frame.h> |
#include <mm/page.h> |
#include <mm/as.h> |
#include <arch.h> |
#include <arch/types.h> |
#include <arch/exception.h> |
#include <align.h> |
#include <config.h> |
#include <print.h> |
#include <symtab.h> |
|
static phte_t *phte; |
|
|
/** Try to find PTE for faulting address |
* |
* Try to find PTE for faulting address. |
* The as->lock must be held on entry to this function |
* if lock is true. |
* |
* @param as Address space. |
* @param lock Lock/unlock the address space. |
* @param badvaddr Faulting virtual address. |
* @param istate Pointer to interrupted state. |
* @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
* @return PTE on success, NULL otherwise. |
* |
*/ |
static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, istate_t *istate, int *pfcr) |
{ |
/* |
* Check if the mapping exists in page tables. |
*/ |
pte_t *pte = page_mapping_find(as, badvaddr); |
if ((pte) && (pte->p)) { |
/* |
* Mapping found in page tables. |
* Immediately succeed. |
*/ |
return pte; |
} else { |
int rc; |
|
/* |
* Mapping not found in page tables. |
* Resort to higher-level page fault handler. |
*/ |
page_table_unlock(as, lock); |
switch (rc = as_page_fault(badvaddr, istate)) { |
case AS_PF_OK: |
/* |
* The higher-level page fault handler succeeded, |
* The mapping ought to be in place. |
*/ |
page_table_lock(as, lock); |
pte = page_mapping_find(as, badvaddr); |
ASSERT((pte) && (pte->p)); |
return pte; |
case AS_PF_DEFER: |
page_table_lock(as, lock); |
*pfcr = rc; |
return NULL; |
case AS_PF_FAULT: |
page_table_lock(as, lock); |
printf("Page fault.\n"); |
*pfcr = rc; |
return NULL; |
default: |
panic("unexpected rc (%d)\n", rc); |
} |
} |
} |
|
|
static void pht_refill_fail(__address badvaddr, istate_t *istate) |
{ |
char *symbol = ""; |
char *sym2 = ""; |
|
char *s = get_symtab_entry(istate->pc); |
if (s) |
symbol = s; |
s = get_symtab_entry(istate->lr); |
if (s) |
sym2 = s; |
panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2); |
} |
|
|
static void pht_insert(const __address vaddr, const pfn_t pfn) |
{ |
__u32 page = (vaddr >> 12) & 0xffff; |
__u32 api = (vaddr >> 22) & 0x3f; |
__u32 vsid; |
|
asm volatile ( |
"mfsrin %0, %1\n" |
: "=r" (vsid) |
: "r" (vaddr) |
); |
|
/* Primary hash (xor) */ |
__u32 h = 0; |
__u32 hash = vsid ^ page; |
__u32 base = (hash & 0x3ff) << 3; |
__u32 i; |
bool found = false; |
|
/* Find unused or colliding |
PTE in PTEG */ |
for (i = 0; i < 8; i++) { |
if ((!phte[base + i].v) || ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) { |
found = true; |
break; |
} |
} |
|
if (!found) { |
/* Secondary hash (not) */ |
__u32 base2 = (~hash & 0x3ff) << 3; |
|
/* Find unused or colliding |
PTE in PTEG */ |
for (i = 0; i < 8; i++) { |
if ((!phte[base2 + i].v) || ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) { |
found = true; |
base = base2; |
h = 1; |
break; |
} |
} |
|
if (!found) { |
// TODO: A/C precedence groups |
i = page % 8; |
} |
} |
|
phte[base + i].v = 1; |
phte[base + i].vsid = vsid; |
phte[base + i].h = h; |
phte[base + i].api = api; |
phte[base + i].rpn = pfn; |
phte[base + i].r = 0; |
phte[base + i].c = 0; |
phte[base + i].pp = 2; // FIXME |
} |
|
|
/** Process Instruction/Data Storage Interrupt |
* |
* @param data True if Data Storage Interrupt. |
* @param istate Interrupted register context. |
* |
*/ |
void pht_refill(bool data, istate_t *istate) |
{ |
__address badvaddr; |
pte_t *pte; |
int pfcr; |
as_t *as; |
bool lock; |
|
if (AS == NULL) { |
as = AS_KERNEL; |
lock = false; |
} else { |
as = AS; |
lock = true; |
} |
|
if (data) { |
asm volatile ( |
"mfdar %0\n" |
: "=r" (badvaddr) |
); |
} else |
badvaddr = istate->pc; |
|
page_table_lock(as, lock); |
|
pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr); |
if (!pte) { |
switch (pfcr) { |
case AS_PF_FAULT: |
goto fail; |
break; |
case AS_PF_DEFER: |
/* |
* The page fault came during copy_from_uspace() |
* or copy_to_uspace(). |
*/ |
page_table_unlock(as, lock); |
return; |
default: |
panic("Unexpected pfrc (%d)\n", pfcr); |
} |
} |
|
pte->a = 1; /* Record access to PTE */ |
pht_insert(badvaddr, pte->pfn); |
|
page_table_unlock(as, lock); |
return; |
|
fail: |
page_table_unlock(as, lock); |
pht_refill_fail(badvaddr, istate); |
} |
|
|
void pht_init(void) |
{ |
memsetb((__address) phte, 1 << PHT_BITS, 0); |
} |
|
|
void page_arch_init(void) |
{ |
if (config.cpu_active == 1) { |
page_mapping_operations = &pt_mapping_operations; |
|
__address cur; |
int flags; |
|
/* Frames below 128 MB are mapped using BAT, |
map rest of the physical memory */ |
for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) { |
flags = PAGE_CACHEABLE; |
if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
flags |= PAGE_GLOBAL; |
page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
} |
|
/* Allocate page hash table */ |
phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC)); |
phte = (phte_t *) PA2KA((__address) physical_phte); |
|
ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0); |
pht_init(); |
|
asm volatile ( |
"mtsdr1 %0\n" |
: |
: "r" ((__address) physical_phte) |
); |
} |
} |
|
|
__address hw_map(__address physaddr, size_t size) |
{ |
if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) |
panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
|
__address virtaddr = PA2KA(last_frame); |
pfn_t i; |
for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE); |
|
last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
|
return virtaddr; |
} |