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/******************************************************************************
* xeno/mm/hypervisor.c
*
* Update page tables via the hypervisor.
*
* Copyright (c) 2002, K A Fraser
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <asm/hypervisor.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#define QUEUE_SIZE 2048
static page_update_request_t update_queue[QUEUE_SIZE];
unsigned int pt_update_queue_idx = 0;
#define idx pt_update_queue_idx
#if PT_UPDATE_DEBUG > 0
page_update_debug_t update_debug_queue[QUEUE_SIZE] = {{0}};
#undef queue_l1_entry_update
#undef queue_l2_entry_update
static void DEBUG_allow_pt_reads(void)
{
pte_t *pte;
page_update_request_t update;
int i;
for ( i = idx-1; i >= 0; i-- )
{
pte = update_debug_queue[i].ptep;
if ( pte == NULL ) continue;
update_debug_queue[i].ptep = NULL;
update.ptr = phys_to_machine(__pa(pte));
update.val = update_debug_queue[i].pteval;
HYPERVISOR_pt_update(&update, 1);
}
}
static void DEBUG_disallow_pt_read(unsigned long pa)
{
pte_t *pte;
pmd_t *pmd;
pgd_t *pgd;
unsigned long pteval;
/*
* We may fault because of an already outstanding update.
* That's okay -- it'll get fixed up in the fault handler.
*/
page_update_request_t update;
unsigned long va = (unsigned long)__va(pa);
pgd = pgd_offset_k(va);
pmd = pmd_offset(pgd, va);
pte = pte_offset(pmd, va);
update.ptr = phys_to_machine(__pa(pte));
pteval = *(unsigned long *)pte;
update.val = pteval & ~_PAGE_PRESENT;
HYPERVISOR_pt_update(&update, 1);
update_debug_queue[idx].ptep = pte;
update_debug_queue[idx].pteval = pteval;
}
#endif
#if PT_UPDATE_DEBUG > 1
#undef queue_pt_switch
#undef queue_tlb_flush
#undef queue_invlpg
#undef queue_pgd_pin
#undef queue_pgd_unpin
#undef queue_pte_pin
#undef queue_pte_unpin
#endif
/*
* This is the current pagetable base pointer, which is updated
* on context switch.
*/
unsigned long pt_baseptr;
void _flush_page_update_queue(void)
{
if ( idx == 0 ) return;
#if PT_UPDATE_DEBUG > 1
printk("Flushing %d entries from pt update queue\n", idx);
#endif
#if PT_UPDATE_DEBUG > 0
DEBUG_allow_pt_reads();
#endif
HYPERVISOR_pt_update(update_queue, idx);
idx = 0;
}
static void increment_index(void)
{
if ( ++idx == QUEUE_SIZE ) _flush_page_update_queue();
}
void queue_l1_entry_update(unsigned long ptr, unsigned long val)
{
#if PT_UPDATE_DEBUG > 0
DEBUG_disallow_pt_read(ptr);
#endif
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].val = val;
increment_index();
}
void queue_l2_entry_update(unsigned long ptr, unsigned long val)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].val = val;
increment_index();
}
void queue_pt_switch(unsigned long ptr)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].ptr |= PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_NEW_BASEPTR;
increment_index();
}
void queue_tlb_flush(void)
{
update_queue[idx].ptr = PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_TLB_FLUSH;
increment_index();
}
void queue_invlpg(unsigned long ptr)
{
update_queue[idx].ptr = PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = ptr & PAGE_MASK;
update_queue[idx].val |= PGEXT_INVLPG;
increment_index();
}
void queue_pgd_pin(unsigned long ptr)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].ptr |= PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_PIN_L2_TABLE;
increment_index();
}
void queue_pgd_unpin(unsigned long ptr)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].ptr |= PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_UNPIN_TABLE;
increment_index();
}
void queue_pte_pin(unsigned long ptr)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].ptr |= PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_PIN_L1_TABLE;
increment_index();
}
void queue_pte_unpin(unsigned long ptr)
{
update_queue[idx].ptr = phys_to_machine(ptr);
update_queue[idx].ptr |= PGREQ_EXTENDED_COMMAND;
update_queue[idx].val = PGEXT_UNPIN_TABLE;
increment_index();
}
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