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powerpc/8xx: Ensures RAM mapped with LTLB is seen as block mapped on 8xx. 

On the 8xx, the RAM mapped with LTLBs must be seen as block mapped,
just like areas mapped with BATs on standard PPC32.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2017-07-12 12:08:45 +02:00 committed by Michael Ellerman
parent 36992606ee
commit eef784bbe7
1 changed files with 11 additions and 2 deletions
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13
arch/powerpc/mm/8xx_mmu.c
View File

@ -22,8 +22,11 @@
extern int __map_without_ltlbs;
static unsigned long block_mapped_ram;
/*
* Return PA for this VA if it is in IMMR area, or 0
* Return PA for this VA if it is in an area mapped with LTLBs.
* Otherwise, returns 0
*/
phys_addr_t v_block_mapped(unsigned long va)
{
@ -33,11 +36,13 @@ phys_addr_t v_block_mapped(unsigned long va)
return 0;
if (va >= VIRT_IMMR_BASE && va < VIRT_IMMR_BASE + IMMR_SIZE)
return p + va - VIRT_IMMR_BASE;
if (va >= PAGE_OFFSET && va < PAGE_OFFSET + block_mapped_ram)
return __pa(va);
return 0;
}
/*
* Return VA for a given PA or 0 if not mapped
* Return VA for a given PA mapped with LTLBs or 0 if not mapped
*/
unsigned long p_block_mapped(phys_addr_t pa)
{
@ -47,6 +52,8 @@ unsigned long p_block_mapped(phys_addr_t pa)
return 0;
if (pa >= p && pa < p + IMMR_SIZE)
return VIRT_IMMR_BASE + pa - p;
if (pa < block_mapped_ram)
return (unsigned long)__va(pa);
return 0;
}
@ -133,6 +140,8 @@ unsigned long __init mmu_mapin_ram(unsigned long top)
if (mapped)
memblock_set_current_limit(mapped);
block_mapped_ram = mapped;
return mapped;
}