26,20 → 26,9 |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
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#include <arch/mm/tlb.h> |
#include <arch/types.h> |
#include <mm/tlb.h> |
#include <mm/frame.h> |
#include <mm/page.h> |
#include <mm/as.h> |
#include <arch.h> |
#include <print.h> |
#include <symtab.h> |
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static phte_t *phte; |
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/** Initialize Page Hash Table. |
* |
* Setup the Page Hash Table with no entries. |
47,198 → 36,14 |
*/ |
void tlb_arch_init(void) |
{ |
phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC)); |
phte =(phte_t *) PA2KA((__address) physical_phte); |
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ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0); |
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memsetb((__address) phte, 1 << PHT_BITS, 0); |
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asm volatile ( |
"mtsdr1 %0\n" |
: |
: "r" ((__address) physical_phte) |
"tlbia\n" |
); |
} |
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/** 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. |
* |
* @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(__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; |
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/* |
* Mapping not found in page tables. |
* Resort to higher-level page fault handler. |
*/ |
page_table_unlock(AS, true); |
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, true); |
pte = page_mapping_find(AS, badvaddr); |
ASSERT((pte) && (pte->p)); |
return pte; |
break; |
case AS_PF_DEFER: |
page_table_lock(AS, true); |
*pfcr = rc; |
return NULL; |
break; |
case AS_PF_FAULT: |
page_table_lock(AS, true); |
printf("Page fault.\n"); |
*pfcr = rc; |
return NULL; |
break; |
default: |
panic("unexpected rc (%d)\n", rc); |
break; |
} |
} |
} |
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static void pht_refill_fail(__address badvaddr, istate_t *istate) |
{ |
char *symbol = ""; |
char *sym2 = ""; |
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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); |
} |
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/** 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) |
{ |
asid_t asid; |
__address badvaddr; |
pte_t *pte; |
__u32 page; |
__u32 api; |
__u32 vsid; |
__u32 hash; |
__u32 i; |
int pfcr; |
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if (data) { |
asm volatile ( |
"mfdar %0\n" |
: "=r" (badvaddr) |
); |
} else |
badvaddr = istate->pc; |
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spinlock_lock(&AS->lock); |
asid = AS->asid; |
spinlock_unlock(&AS->lock); |
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page_table_lock(AS, true); |
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pte = find_mapping_and_check(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, true); |
return; |
default: |
panic("Unexpected pfrc (%d)\n", pfcr); |
break; |
} |
} |
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/* Record access to PTE */ |
pte->a = 1; |
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page = (badvaddr >> 12) & 0xffff; |
api = (badvaddr >> 22) & 0x3f; |
asm volatile ( |
"mfsrin %0, %1\n" |
: "=r" (vsid) |
: "r" (badvaddr) |
); |
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/* Primary hash (xor) */ |
hash = ((vsid ^ page) & 0x3ff) << 3; |
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/* Find invalid PTE in PTEG */ |
for (i = 0; i < 8; i++) { |
if (!phte[hash + i].v) |
break; |
} |
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// TODO: Check access/change bits, secondary hash |
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if (i == 8) |
i = page % 8; |
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phte[hash + i].v = 1; |
phte[hash + i].vsid = vsid; |
phte[hash + i].h = 0; |
phte[hash + i].api = api; |
phte[hash + i].rpn = pte->pfn; |
phte[hash + i].r = 0; |
phte[hash + i].c = 0; |
phte[hash + i].pp = 2; // FIXME |
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page_table_unlock(AS, true); |
return; |
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fail: |
page_table_unlock(AS, true); |
pht_refill_fail(badvaddr, istate); |
} |
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void tlb_invalidate_all(void) |
{ |
ipl_t ipl; |
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ipl = interrupts_disable(); |
memsetb((__address) phte, 1 << PHT_BITS, 0); |
interrupts_restore(ipl); |
} |
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