Commit cb9d7707 authored by Linus Walleij's avatar Linus Walleij Committed by Russell King
Browse files

ARM: 6222/1: add memory types for the TCMs 



The earlier TCM memory regions were mapped as MT_MEMORY_UNCACHED
which doesn't really work on platforms supporting the new v6
features like the NX bit. Add unique MT_MEMORY_[I|D]TCM types
instead.

Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f159f4ed

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

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ struct map_desc { 
#define MT_MEMORY		9

#define MT_ROM			10

#define MT_MEMORY_NONCACHED	11

#define MT_MEMORY_DTCM		12

#define MT_MEMORY_ITCM		13



#ifdef CONFIG_MMU

extern void iotable_init(struct map_desc *, int);

arch/arm/kernel/tcm.c

+2 −3
Original line number Diff line number Diff line
@@ -13,7 +13,6 @@ 
#include <linux/ioport.h>

#include <linux/genalloc.h>

#include <linux/string.h> /* memcpy */

#include <asm/page.h> /* PAGE_SHIFT */

#include <asm/cputype.h>

#include <asm/mach/map.h>

#include <mach/memory.h>
@@ -53,7 +52,7 @@ static struct map_desc dtcm_iomap[] __initdata = { 
		.virtual	= DTCM_OFFSET,

		.pfn		= __phys_to_pfn(DTCM_OFFSET),

		.length		= (DTCM_END - DTCM_OFFSET + 1),

		.type		= MT_UNCACHED

		.type		= MT_MEMORY_DTCM

	}

};
@@ -62,7 +61,7 @@ static struct map_desc itcm_iomap[] __initdata = { 
		.virtual	= ITCM_OFFSET,

		.pfn		= __phys_to_pfn(ITCM_OFFSET),

		.length		= (ITCM_END - ITCM_OFFSET + 1),

		.type		= MT_UNCACHED

		.type		= MT_MEMORY_ITCM

	}

};

arch/arm/mm/mmu.c

+13 −0
Original line number Diff line number Diff line
@@ -258,6 +258,19 @@ static struct mem_type mem_types[] = { 
		.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,

		.domain    = DOMAIN_KERNEL,

	},

	[MT_MEMORY_DTCM] = {

		.prot_pte	= L_PTE_PRESENT | L_PTE_YOUNG |

		                  L_PTE_DIRTY | L_PTE_WRITE,

		.prot_l1	= PMD_TYPE_TABLE,

		.prot_sect	= PMD_TYPE_SECT | PMD_SECT_XN,

		.domain		= DOMAIN_KERNEL,

	},

	[MT_MEMORY_ITCM] = {

		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |

				L_PTE_USER | L_PTE_EXEC,

		.prot_l1   = PMD_TYPE_TABLE,

		.domain    = DOMAIN_IO,

	},

};



const struct mem_type *get_mem_type(unsigned int type)

CRA Git | Maintained and supported by SUSTech CRA and CCSE