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#include <xen/bitops.h>
#include <xen/init.h>
#include <xen/irq.h>
#include <xen/pmap.h>
#include <asm/pmap.h>
#include <asm/fixmap.h>
/*
* Simple mapping infrastructure to map / unmap pages in fixed map.
* This is used to set the page table before the map domain page infrastructure
* is initialized.
*
* This structure is not protected by any locks, so it must not be used after
* smp bring-up.
*/
/* Bitmap to track which slot is used */
static __initdata DECLARE_BITMAP(inuse, NUM_FIX_PMAP);
void *__init pmap_map(mfn_t mfn)
{
unsigned int idx;
unsigned int slot;
ASSERT(system_state < SYS_STATE_smp_boot);
ASSERT(!in_irq());
idx = find_first_zero_bit(inuse, NUM_FIX_PMAP);
if ( idx == NUM_FIX_PMAP )
panic("Out of PMAP slots\n");
__set_bit(idx, inuse);
slot = idx + FIXMAP_PMAP_BEGIN;
ASSERT(slot >= FIXMAP_PMAP_BEGIN && slot <= FIXMAP_PMAP_END);
/*
* We cannot use set_fixmap() here. We use PMAP when the domain map
* page infrastructure is not yet initialized, so map_pages_to_xen() called
* by set_fixmap() needs to map pages on demand, which then calls pmap()
* again, resulting in a loop. Modify the PTEs directly instead. The same
* is true for pmap_unmap().
*/
arch_pmap_map(slot, mfn);
return fix_to_virt(slot);
}
void __init pmap_unmap(const void *p)
{
unsigned int idx;
unsigned int slot = virt_to_fix((unsigned long)p);
ASSERT(system_state < SYS_STATE_smp_boot);
ASSERT(slot >= FIXMAP_PMAP_BEGIN && slot <= FIXMAP_PMAP_END);
ASSERT(!in_irq());
idx = slot - FIXMAP_PMAP_BEGIN;
__clear_bit(idx, inuse);
arch_pmap_unmap(slot);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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