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[ARM] Set bit 4 on section mappings correctly depending on CPU 

On some CPUs, bit 4 of section mappings means "update the
cache when written to".  On others, this bit is required to
be one, and others it's required to be zero.  Finally, on
ARMv6 and above, setting it turns on "no execute" and prevents
speculative prefetches.

With all these combinations, no one value fits all CPUs, so we
have to pick a value depending on the CPU type, and the area
we're mapping.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-06-29 18:24:21 +01:00 committed by Russell King
parent 326764a85b
commit 8799ee9f49
20 changed files with 147 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/kernel/asm-offsets.c
View File

@ -105,6 +105,7 @@ int main(void)
BLANK();
DEFINE(PROC_INFO_SZ, sizeof(struct proc_info_list));
DEFINE(PROCINFO_INITFUNC, offsetof(struct proc_info_list, __cpu_flush));
DEFINE(PROCINFO_MMUFLAGS, offsetof(struct proc_info_list, __cpu_mmu_flags));
DEFINE(PROCINFO_MM_MMUFLAGS, offsetof(struct proc_info_list, __cpu_mm_mmu_flags));
DEFINE(PROCINFO_IO_MMUFLAGS, offsetof(struct proc_info_list, __cpu_io_mmu_flags));
return 0;
}

5
arch/arm/kernel/head.S
View File

@ -221,7 +221,7 @@ __create_page_tables:
teq r0, r6
bne 1b
ldr r7, [r10, #PROCINFO_MMUFLAGS] @ mmuflags
ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags
/*
* Create identity mapping for first MB of kernel to
@ -272,8 +272,7 @@ __create_page_tables:
#endif
#ifdef CONFIG_DEBUG_LL
bic r7, r7, #0x0c @ turn off cacheable
@ and bufferable bits
ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
/*
* Map in IO space for serial debugging.
* This allows debug messages to be output

37
arch/arm/mm/mm-armv.c
View File

@ -303,16 +303,16 @@ static struct mem_types mem_types[] __initdata = {
.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_UNCACHED |
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED |
PMD_SECT_AP_WRITE,
.domain = DOMAIN_IO,
},
[MT_CACHECLEAN] = {
.prot_sect = PMD_TYPE_SECT,
.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
.domain = DOMAIN_KERNEL,
},
[MT_MINICLEAN] = {
.prot_sect = PMD_TYPE_SECT | PMD_SECT_MINICACHE,
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_MINICACHE,
.domain = DOMAIN_KERNEL,
},
[MT_LOW_VECTORS] = {
@ -328,25 +328,25 @@ static struct mem_types mem_types[] __initdata = {
.domain = DOMAIN_USER,
},
[MT_MEMORY] = {
.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_AP_WRITE,
.domain = DOMAIN_KERNEL,
},
[MT_ROM] = {
.prot_sect = PMD_TYPE_SECT,
.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
.domain = DOMAIN_KERNEL,
},
[MT_IXP2000_DEVICE] = { /* IXP2400 requires XCB=101 for on-chip I/O */
.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_UNCACHED |
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED |
PMD_SECT_AP_WRITE | PMD_SECT_BUFFERABLE |
PMD_SECT_TEX(1),
.domain = DOMAIN_IO,
},
[MT_NONSHARED_DEVICE] = {
.prot_l1 = PMD_TYPE_TABLE,
.prot_sect = PMD_TYPE_SECT | PMD_SECT_NONSHARED_DEV |
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_NONSHARED_DEV |
PMD_SECT_AP_WRITE,
.domain = DOMAIN_IO,
}
@ -376,14 +376,21 @@ void __init build_mem_type_table(void)
ecc_mask = 0;
}
if (cpu_arch <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale()) {
for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
/*
* Xscale must not have PMD bit 4 set for section mappings.
*/
if (cpu_is_xscale())
for (i = 0; i < ARRAY_SIZE(mem_types); i++)
mem_types[i].prot_sect &= ~PMD_BIT4;
/*
* ARMv5 and lower, excluding Xscale, bit 4 must be set for
* page tables.
*/
if (cpu_arch < CPU_ARCH_ARMv6 && !cpu_is_xscale())
for (i = 0; i < ARRAY_SIZE(mem_types); i++)
if (mem_types[i].prot_l1)
mem_types[i].prot_l1 |= PMD_BIT4;
if (mem_types[i].prot_sect)
mem_types[i].prot_sect |= PMD_BIT4;
}
}
cp = &cache_policies[cachepolicy];
kern_pgprot = user_pgprot = cp->pte;
@ -407,8 +414,8 @@ void __init build_mem_type_table(void)
* bit 4 becomes XN which we must clear for the
* kernel memory mapping.
*/
mem_types[MT_MEMORY].prot_sect &= ~PMD_BIT4;
mem_types[MT_ROM].prot_sect &= ~PMD_BIT4;
mem_types[MT_MEMORY].prot_sect &= ~PMD_SECT_XN;
mem_types[MT_ROM].prot_sect &= ~PMD_SECT_XN;
/*
* Mark cache clean areas and XIP ROM read only

3
arch/arm/mm/proc-arm1020.S
View File

@ -524,6 +524,9 @@ cpu_arm1020_name:
__arm1020_proc_info:
.long 0x4104a200 @ ARM 1020T (Architecture v5T)
.long 0xff0ffff0
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ

4
arch/arm/mm/proc-arm1020e.S
View File

@ -488,6 +488,10 @@ cpu_arm1020e_name:
__arm1020e_proc_info:
.long 0x4105a200 @ ARM 1020TE (Architecture v5TE)
.long 0xff0ffff0
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \

4
arch/arm/mm/proc-arm1022.S
View File

@ -471,6 +471,10 @@ cpu_arm1022_name:
__arm1022_proc_info:
.long 0x4105a220 @ ARM 1022E (v5TE)
.long 0xff0ffff0
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \

4
arch/arm/mm/proc-arm1026.S
View File

@ -467,6 +467,10 @@ cpu_arm1026_name:
__arm1026_proc_info:
.long 0x4106a260 @ ARM 1026EJ-S (v5TEJ)
.long 0xff0ffff0
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \

16
arch/arm/mm/proc-arm6_7.S
View File

@ -355,6 +355,10 @@ __arm6_proc_info:
.long 0x41560600
.long 0xfffffff0
.long 0x00000c1e
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm6_setup
.long cpu_arch_name
.long cpu_elf_name
@ -371,6 +375,10 @@ __arm610_proc_info:
.long 0x41560610
.long 0xfffffff0
.long 0x00000c1e
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm6_setup
.long cpu_arch_name
.long cpu_elf_name
@ -387,6 +395,10 @@ __arm7_proc_info:
.long 0x41007000
.long 0xffffff00
.long 0x00000c1e
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm7_setup
.long cpu_arch_name
.long cpu_elf_name
@ -408,6 +420,10 @@ __arm710_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm7_setup
.long cpu_arch_name
.long cpu_elf_name

8
arch/arm/mm/proc-arm720.S
View File

@ -246,6 +246,10 @@ __arm710_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm710_setup @ cpu_flush
.long cpu_arch_name @ arch_name
.long cpu_elf_name @ elf_name
@ -267,6 +271,10 @@ __arm720_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm720_setup @ cpu_flush
.long cpu_arch_name @ arch_name
.long cpu_elf_name @ elf_name

4
arch/arm/mm/proc-arm920.S
View File

@ -461,6 +461,10 @@ __arm920_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm920_setup
.long cpu_arch_name
.long cpu_elf_name

4
arch/arm/mm/proc-arm922.S
View File

@ -465,6 +465,10 @@ __arm922_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm922_setup
.long cpu_arch_name
.long cpu_elf_name

8
arch/arm/mm/proc-arm925.S
View File

@ -522,6 +522,10 @@ cpu_arm925_name:
__arm925_proc_info:
.long 0x54029250
.long 0xfffffff0
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
@ -541,6 +545,10 @@ __arm925_proc_info:
__arm915_proc_info:
.long 0x54029150
.long 0xfffffff0
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \

4
arch/arm/mm/proc-arm926.S
View File

@ -477,6 +477,10 @@ __arm926_proc_info:
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_BIT4 | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __arm926_setup
.long cpu_arch_name
.long cpu_elf_name

3
arch/arm/mm/proc-sa110.S
View File

@ -255,6 +255,9 @@ __sa110_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __sa110_setup
.long cpu_arch_name
.long cpu_elf_name

6
arch/arm/mm/proc-sa1100.S
View File

@ -276,6 +276,9 @@ __sa1100_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __sa1100_setup
.long cpu_arch_name
.long cpu_elf_name
@ -296,6 +299,9 @@ __sa1110_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __sa1100_setup
.long cpu_arch_name
.long cpu_elf_name

4
arch/arm/mm/proc-v6.S
View File

@ -269,6 +269,10 @@ __v6_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_XN | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __v6_setup
.long cpu_arch_name
.long cpu_elf_name

9
arch/arm/mm/proc-xsc3.S
View File

@ -487,7 +487,14 @@ cpu_xsc3_name:
__xsc3_proc_info:
.long 0x69056000
.long 0xffffe000
.long 0x00000c0e
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xsc3_setup
.long cpu_arch_name
.long cpu_elf_name

39
arch/arm/mm/proc-xscale.S
View File

@ -595,6 +595,9 @@ __80200_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -615,6 +618,9 @@ __8032x_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -635,6 +641,9 @@ __8033x_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -655,6 +664,9 @@ __pxa250_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -675,6 +687,9 @@ __pxa210_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -695,6 +710,9 @@ __ixp2400_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -715,6 +733,9 @@ __ixp2800_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -735,6 +756,9 @@ __ixp42x_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -750,7 +774,14 @@ __ixp42x_proc_info:
__ixp46x_proc_info:
.long 0x69054200
.long 0xffffff00
.long 0x00000c0e
.long PMD_TYPE_SECT | \
PMD_SECT_BUFFERABLE | \
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -771,6 +802,9 @@ __pxa255_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name
@ -791,6 +825,9 @@ __pxa270_proc_info:
PMD_SECT_CACHEABLE | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
.long PMD_TYPE_SECT | \
PMD_SECT_AP_WRITE | \
PMD_SECT_AP_READ
b __xscale_setup
.long cpu_arch_name
.long cpu_elf_name

1
include/asm-arm/pgtable-hwdef.h
View File

@ -28,6 +28,7 @@
*/
#define PMD_SECT_BUFFERABLE (1 << 2)
#define PMD_SECT_CACHEABLE (1 << 3)
#define PMD_SECT_XN (1 << 4) /* v6 */
#define PMD_SECT_AP_WRITE (1 << 10)
#define PMD_SECT_AP_READ (1 << 11)
#define PMD_SECT_TEX(x) ((x) << 12) /* v5 */

3
include/asm-arm/procinfo.h
View File

@ -29,7 +29,8 @@ struct processor;
struct proc_info_list {
unsigned int cpu_val;
unsigned int cpu_mask;
unsigned long __cpu_mmu_flags; /* used by head.S */
unsigned long __cpu_mm_mmu_flags; /* used by head.S */
unsigned long __cpu_io_mmu_flags; /* used by head.S */
unsigned long __cpu_flush; /* used by head.S */
const char *arch_name;
const char *elf_name;