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

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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: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2010-07-12 21:50:59 +01:00 committed by Russell King
parent f159f4ed55
commit cb9d7707cd
3 changed files with 17 additions and 3 deletions
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2
arch/arm/include/asm/mach/map.h
View File

@ -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);

5
arch/arm/kernel/tcm.c
View File

@ -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
}
};

13
arch/arm/mm/mmu.c
View File

@ -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)