Re: [RFC PATCH v1 10/18] x86/efi: Access EFI related tables in the clear

[Matt Fleming <matt@codeblueprint.co.uk>]

On Mon, 13 Jun, at 01:03:22PM, Matt Fleming wrote:
> 
> Would we need a new function? Couldn't we just have a new
> FIXMAP_PAGE_* constant? e.g. would something like this work?
> 
> ---
> 
> enum memremap_owner {
> 	KERNEL_DATA = 0,
> 	BOOT_DATA,
> };
> 
> void __init *
> early_memremap(resource_size_t phys_addr, unsigned long size,
> 	       enum memremap_owner owner)
> {
> 	pgprot_t prot;
> 
> 	switch (owner) {
> 	case BOOT_DATA:
> 		prot = FIXMAP_PAGE_BOOT;
> 		break;
> 	case KERNEL_DATA:	/* FALLTHROUGH */
> 	default:
> 		prot = FIXMAP_PAGE_NORMAL;
> 		
> 	}
> 
> 	return (__force void *)__early_ioremap(phys_addr, size, prot);
> }

Although it occurs to me that if there's a trivial 1:1 mapping between
memremap_owner and FIXMAP_PAGE_* we might as well just add a new
early_memremap_boot() that uses the correct FIXMAP_PAGE_* constant,
akin to early_memremap_ro().