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Commit c7936206 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by ard
Browse files

ARM: implement create_mapping_late() for EFI use 



This implements create_mapping_late(), which we will use to populate
the UEFI Runtime Services page tables.

Tested-by: default avatarRyan Harkin <ryan.harkin@linaro.org>
Reviewed-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
parent b430e55b

arch/arm/include/asm/mach/map.h

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ enum { 
extern void iotable_init(struct map_desc *, int);

extern void vm_reserve_area_early(unsigned long addr, unsigned long size,

				  void *caller);

extern void create_mapping_late(struct mm_struct *mm, struct map_desc *md,

				bool ng);



#ifdef CONFIG_DEBUG_LL

extern void debug_ll_addr(unsigned long *paddr, unsigned long *vaddr);

arch/arm/mm/mmu.c

+20 −0
Original line number Diff line number Diff line
@@ -724,6 +724,14 @@ static void __init *early_alloc(unsigned long sz) 
	return early_alloc_aligned(sz, sz);

}



static void *__init late_alloc(unsigned long sz)

{

	void *ptr = (void *)__get_free_pages(PGALLOC_GFP, get_order(sz));



	BUG_ON(!ptr);

	return ptr;

}



static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr,

				unsigned long prot,

				void *(*alloc)(unsigned long sz))
@@ -960,6 +968,18 @@ static void __init create_mapping(struct map_desc *md) 
	__create_mapping(&init_mm, md, early_alloc, false);

}



void __init create_mapping_late(struct mm_struct *mm, struct map_desc *md,

				bool ng)

{

#ifdef CONFIG_ARM_LPAE

	pud_t *pud = pud_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);

	if (WARN_ON(!pud))

		return;

	pmd_alloc(mm, pud, 0);

#endif

	__create_mapping(mm, md, late_alloc, ng);

}



/*

 * Create the architecture specific mappings

 */