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sparc: Access kernel TSB using physical addressing when possible.

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On sun4v this is basically required since we point the hypervisor and
the TSB walking hardware at these tables using physical addressing
too.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-08-05 00:53:57 -07:00
parent a61b582954
commit 9076d0e7e0
4 changed files with 85 additions and 40 deletions
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40
arch/sparc/mm/init_64.c
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@ -1597,6 +1597,42 @@ static void __init tsb_phys_patch(void)
static struct hv_tsb_descr ktsb_descr[NUM_KTSB_DESCR];
extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
static void patch_one_ktsb_phys(unsigned int *start, unsigned int *end, unsigned long pa)
{
pa >>= KTSB_PHYS_SHIFT;
while (start < end) {
unsigned int *ia = (unsigned int *)(unsigned long)*start;
ia[0] = (ia[0] & ~0x3fffff) | (pa >> 10);
__asm__ __volatile__("flush %0" : : "r" (ia));
ia[1] = (ia[1] & ~0x3ff) | (pa & 0x3ff);
__asm__ __volatile__("flush %0" : : "r" (ia + 1));
start++;
}
}
static void ktsb_phys_patch(void)
{
extern unsigned int __swapper_tsb_phys_patch;
extern unsigned int __swapper_tsb_phys_patch_end;
extern unsigned int __swapper_4m_tsb_phys_patch;
extern unsigned int __swapper_4m_tsb_phys_patch_end;
unsigned long ktsb_pa;
ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);
patch_one_ktsb_phys(&__swapper_tsb_phys_patch,
&__swapper_tsb_phys_patch_end, ktsb_pa);
#ifndef CONFIG_DEBUG_PAGEALLOC
ktsb_pa = (kern_base +
((unsigned long)&swapper_4m_tsb[0] - KERNBASE));
patch_one_ktsb_phys(&__swapper_4m_tsb_phys_patch,
&__swapper_4m_tsb_phys_patch_end, ktsb_pa);
#endif
}
static void __init sun4v_ktsb_init(void)
{
unsigned long ktsb_pa;
@ -1716,8 +1752,10 @@ void __init paging_init(void)
sun4u_pgprot_init();
if (tlb_type == cheetah_plus ||
tlb_type == hypervisor)
tlb_type == hypervisor) {
tsb_phys_patch();
ktsb_phys_patch();
}
if (tlb_type == hypervisor) {
sun4v_patch_tlb_handlers();