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arm64 updates for 4.1:

Browse Source 
The main change here is a significant head.S rework that allows us to
 boot on machines with physical memory at a really high address without
 having to increase our mapped VA range. Other changes include:
 
 - AES performance boost for Cortex-A57
 - AArch32 (compat) userspace with 64k pages
 - Cortex-A53 erratum workaround for #845719
 - defconfig updates (new platforms, PCI, ...)
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Will Deacon:
 "Here are the core arm64 updates for 4.1.

  Highlights include a significant rework to head.S (allowing us to boot
  on machines with physical memory at a really high address), an AES
  performance boost on Cortex-A57 and the ability to run a 32-bit
  userspace with 64k pages (although this requires said userspace to be
  built with a recent binutils).

  The head.S rework spilt over into KVM, so there are some changes under
  arch/arm/ which have been acked by Marc Zyngier (KVM co-maintainer).
  In particular, the linker script changes caused us some issues in
  -next, so there are a few merge commits where we had to apply fixes on
  top of a stable branch.

  Other changes include:

   - AES performance boost for Cortex-A57
   - AArch32 (compat) userspace with 64k pages
   - Cortex-A53 erratum workaround for #845719
   - defconfig updates (new platforms, PCI, ...)"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (39 commits)
  arm64: fix midr range for Cortex-A57 erratum 832075
  arm64: errata: add workaround for cortex-a53 erratum #845719
  arm64: Use bool function return values of true/false not 1/0
  arm64: defconfig: updates for 4.1
  arm64: Extract feature parsing code from cpu_errata.c
  arm64: alternative: Allow immediate branch as alternative instruction
  arm64: insn: Add aarch64_insn_decode_immediate
  ARM: kvm: round HYP section to page size instead of log2 upper bound
  ARM: kvm: assert on HYP section boundaries not actual code size
  arm64: head.S: ensure idmap_t0sz is visible
  arm64: pmu: add support for interrupt-affinity property
  dt: pmu: extend ARM PMU binding to allow for explicit interrupt affinity
  arm64: head.S: ensure visibility of page tables
  arm64: KVM: use ID map with increased VA range if required
  arm64: mm: increase VA range of identity map
  ARM: kvm: implement replacement for ld's LOG2CEIL()
  arm64: proc: remove unused cpu_get_pgd macro
  arm64: enforce x1|x2|x3 == 0 upon kernel entry as per boot protocol
  arm64: remove __calc_phys_offset
  arm64: merge __enable_mmu and __turn_mmu_on
  ...
This commit is contained in:
Linus Torvalds 2015-04-16 13:58:29 -05:00
commit 714d8e7e27
45 changed files with 748 additions and 409 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/devicetree/bindings/arm/pmu.txt
View File

@ -26,6 +26,13 @@ Required properties:
Optional properties:
- interrupt-affinity : Valid only when using SPIs, specifies a list of phandles
to CPU nodes corresponding directly to the affinity of
the SPIs listed in the interrupts property.
This property should be present when there is more than
a single SPI.
- qcom,no-pc-write : Indicates that this PMU doesn't support the 0xc and 0xd
events.

10
arch/arm/include/asm/kvm_mmu.h
View File

@ -269,6 +269,16 @@ static inline void __kvm_flush_dcache_pud(pud_t pud)
void kvm_set_way_flush(struct kvm_vcpu *vcpu);
void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
static inline bool __kvm_cpu_uses_extended_idmap(void)
{
return false;
}
static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
pgd_t *hyp_pgd,
pgd_t *merged_hyp_pgd,
unsigned long hyp_idmap_start) { }
#endif /* !__ASSEMBLY__ */
#endif /* __ARM_KVM_MMU_H__ */

11
arch/arm/kernel/vmlinux.lds.S
View File

@ -11,7 +11,7 @@
#ifdef CONFIG_ARM_KERNMEM_PERMS
#include <asm/pgtable.h>
#endif
#define PROC_INFO \
. = ALIGN(4); \
VMLINUX_SYMBOL(__proc_info_begin) = .; \
@ -23,7 +23,7 @@
VMLINUX_SYMBOL(__idmap_text_start) = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .; \
. = ALIGN(32); \
. = ALIGN(PAGE_SIZE); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
@ -343,8 +343,11 @@ SECTIONS
*/
ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
/*
* The HYP init code can't be more than a page long.
* The HYP init code can't be more than a page long,
* and should not cross a page boundary.
* The above comment applies as well.
*/
ASSERT(((__hyp_idmap_text_end - __hyp_idmap_text_start) <= PAGE_SIZE), "HYP init code too big")
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
"HYP init code too big or misaligned")

69
arch/arm/kvm/mmu.c
View File

@ -35,9 +35,9 @@ extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
static pgd_t *boot_hyp_pgd;
static pgd_t *hyp_pgd;
static pgd_t *merged_hyp_pgd;
static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
static void *init_bounce_page;
static unsigned long hyp_idmap_start;
static unsigned long hyp_idmap_end;
static phys_addr_t hyp_idmap_vector;
@ -405,9 +405,6 @@ void free_boot_hyp_pgd(void)
if (hyp_pgd)
unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
free_page((unsigned long)init_bounce_page);
init_bounce_page = NULL;
mutex_unlock(&kvm_hyp_pgd_mutex);
}
@ -438,6 +435,11 @@ void free_hyp_pgds(void)
free_pages((unsigned long)hyp_pgd, hyp_pgd_order);
hyp_pgd = NULL;
}
if (merged_hyp_pgd) {
clear_page(merged_hyp_pgd);
free_page((unsigned long)merged_hyp_pgd);
merged_hyp_pgd = NULL;
}
mutex_unlock(&kvm_hyp_pgd_mutex);
}
@ -1622,12 +1624,18 @@ void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
phys_addr_t kvm_mmu_get_httbr(void)
{
return virt_to_phys(hyp_pgd);
if (__kvm_cpu_uses_extended_idmap())
return virt_to_phys(merged_hyp_pgd);
else
return virt_to_phys(hyp_pgd);
}
phys_addr_t kvm_mmu_get_boot_httbr(void)
{
return virt_to_phys(boot_hyp_pgd);
if (__kvm_cpu_uses_extended_idmap())
return virt_to_phys(merged_hyp_pgd);
else
return virt_to_phys(boot_hyp_pgd);
}
phys_addr_t kvm_get_idmap_vector(void)
@ -1643,39 +1651,11 @@ int kvm_mmu_init(void)
hyp_idmap_end = kvm_virt_to_phys(__hyp_idmap_text_end);
hyp_idmap_vector = kvm_virt_to_phys(__kvm_hyp_init);
if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) {
/*
* Our init code is crossing a page boundary. Allocate
* a bounce page, copy the code over and use that.
*/
size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
phys_addr_t phys_base;
init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
if (!init_bounce_page) {
kvm_err("Couldn't allocate HYP init bounce page\n");
err = -ENOMEM;
goto out;
}
memcpy(init_bounce_page, __hyp_idmap_text_start, len);
/*
* Warning: the code we just copied to the bounce page
* must be flushed to the point of coherency.
* Otherwise, the data may be sitting in L2, and HYP
* mode won't be able to observe it as it runs with
* caches off at that point.
*/
kvm_flush_dcache_to_poc(init_bounce_page, len);
phys_base = kvm_virt_to_phys(init_bounce_page);
hyp_idmap_vector += phys_base - hyp_idmap_start;
hyp_idmap_start = phys_base;
hyp_idmap_end = phys_base + len;
kvm_info("Using HYP init bounce page @%lx\n",
(unsigned long)phys_base);
}
/*
* We rely on the linker script to ensure at build time that the HYP
* init code does not cross a page boundary.
*/
BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK);
hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order);
@ -1698,6 +1678,17 @@ int kvm_mmu_init(void)
goto out;
}
if (__kvm_cpu_uses_extended_idmap()) {
merged_hyp_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
if (!merged_hyp_pgd) {
kvm_err("Failed to allocate extra HYP pgd\n");
goto out;
}
__kvm_extend_hypmap(boot_hyp_pgd, hyp_pgd, merged_hyp_pgd,
hyp_idmap_start);
return 0;
}
/* Map the very same page at the trampoline VA */
err = __create_hyp_mappings(boot_hyp_pgd,
TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,

35
arch/arm64/Kconfig
View File

@ -368,6 +368,27 @@ config ARM64_ERRATUM_832075
If unsure, say Y.
config ARM64_ERRATUM_845719
bool "Cortex-A53: 845719: a load might read incorrect data"
depends on COMPAT
default y
help
This option adds an alternative code sequence to work around ARM
erratum 845719 on Cortex-A53 parts up to r0p4.
When running a compat (AArch32) userspace on an affected Cortex-A53
part, a load at EL0 from a virtual address that matches the bottom 32
bits of the virtual address used by a recent load at (AArch64) EL1
might return incorrect data.
The workaround is to write the contextidr_el1 register on exception
return to a 32-bit task.
Please note that this does not necessarily enable the workaround,
as it depends on the alternative framework, which will only patch
the kernel if an affected CPU is detected.
If unsure, say Y.
endmenu
@ -455,8 +476,8 @@ config SCHED_SMT
places. If unsure say N here.
config NR_CPUS
int "Maximum number of CPUs (2-64)"
range 2 64
int "Maximum number of CPUs (2-4096)"
range 2 4096
depends on SMP
# These have to remain sorted largest to smallest
default "64"
@ -470,6 +491,10 @@ config HOTPLUG_CPU
source kernel/Kconfig.preempt
config UP_LATE_INIT
def_bool y
depends on !SMP
config HZ
int
default 100
@ -670,7 +695,7 @@ source "fs/Kconfig.binfmt"
config COMPAT
bool "Kernel support for 32-bit EL0"
depends on !ARM64_64K_PAGES
depends on !ARM64_64K_PAGES || EXPERT
select COMPAT_BINFMT_ELF
select HAVE_UID16
select OLD_SIGSUSPEND3
@ -681,6 +706,10 @@ config COMPAT
the user helper functions, VFP support and the ptrace interface are
handled appropriately by the kernel.
If you also enabled CONFIG_ARM64_64K_PAGES, please be aware that you
will only be able to execute AArch32 binaries that were compiled with
64k aligned segments.
If you want to execute 32-bit userspace applications, say Y.
config SYSVIPC_COMPAT

2
arch/arm64/Makefile
View File

@ -48,7 +48,7 @@ core-$(CONFIG_KVM) += arch/arm64/kvm/
core-$(CONFIG_XEN) += arch/arm64/xen/
core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
libs-y := arch/arm64/lib/ $(libs-y)
libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/
core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
# Default target when executing plain make
KBUILD_IMAGE := Image.gz

14
arch/arm64/configs/defconfig
View File

@ -31,8 +31,12 @@ CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_BLK_DEV_BSG is not set
# CONFIG_IOSCHED_DEADLINE is not set
CONFIG_ARCH_EXYNOS7=y
CONFIG_ARCH_FSL_LS2085A=y
CONFIG_ARCH_MEDIATEK=y
CONFIG_ARCH_SEATTLE=y
CONFIG_ARCH_TEGRA=y
CONFIG_ARCH_TEGRA_132_SOC=y
CONFIG_ARCH_THUNDER=y
CONFIG_ARCH_VEXPRESS=y
CONFIG_ARCH_XGENE=y
@ -62,6 +66,7 @@ CONFIG_BPF_JIT=y
# CONFIG_WIRELESS is not set
CONFIG_NET_9P=y
CONFIG_NET_9P_VIRTIO=y
# CONFIG_TEGRA_AHB is not set
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
@ -81,6 +86,7 @@ CONFIG_NETDEVICES=y
CONFIG_TUN=y
CONFIG_VIRTIO_NET=y
CONFIG_NET_XGENE=y
CONFIG_SKY2=y
CONFIG_SMC91X=y
CONFIG_SMSC911X=y
# CONFIG_WLAN is not set
@ -100,6 +106,8 @@ CONFIG_SPI=y
CONFIG_SPI_PL022=y
CONFIG_GPIO_PL061=y
CONFIG_GPIO_XGENE=y
CONFIG_POWER_RESET_XGENE=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_REGULATOR=y
CONFIG_REGULATOR_FIXED_VOLTAGE=y
@ -112,10 +120,10 @@ CONFIG_LOGO=y
CONFIG_USB=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_HCD_PLATFORM=y
CONFIG_USB_ISP1760_HCD=y
CONFIG_USB_OHCI_HCD=y
CONFIG_USB_OHCI_HCD_PLATFORM=y
CONFIG_USB_STORAGE=y
CONFIG_USB_ISP1760=y
CONFIG_USB_ULPI=y
CONFIG_MMC=y
CONFIG_MMC_ARMMMCI=y
@ -125,6 +133,7 @@ CONFIG_MMC_SPI=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_EFI=y
CONFIG_RTC_DRV_XGENE=y
CONFIG_VIRTIO_PCI=y
CONFIG_VIRTIO_BALLOON=y
CONFIG_VIRTIO_MMIO=y
# CONFIG_IOMMU_SUPPORT is not set
@ -143,8 +152,10 @@ CONFIG_CUSE=y
CONFIG_VFAT_FS=y
CONFIG_TMPFS=y
CONFIG_HUGETLBFS=y
CONFIG_EFIVAR_FS=y
# CONFIG_MISC_FILESYSTEMS is not set
CONFIG_NFS_FS=y
CONFIG_NFS_V4=y
CONFIG_ROOT_NFS=y
CONFIG_9P_FS=y
CONFIG_NLS_CODEPAGE_437=y
@ -159,7 +170,6 @@ CONFIG_LOCKUP_DETECTOR=y
# CONFIG_SCHED_DEBUG is not set
# CONFIG_DEBUG_PREEMPT is not set
# CONFIG_FTRACE is not set
CONFIG_KEYS=y
CONFIG_SECURITY=y
CONFIG_CRYPTO_ANSI_CPRNG=y
CONFIG_ARM64_CRYPTO=y

12
arch/arm64/crypto/aes-ce-ccm-core.S
View File

@ -101,19 +101,19 @@ ENTRY(ce_aes_ccm_final)
0: mov v4.16b, v3.16b
1: ld1 {v5.2d}, [x2], #16 /* load next round key */
aese v0.16b, v4.16b
aese v1.16b, v4.16b
aesmc v0.16b, v0.16b
aese v1.16b, v4.16b
aesmc v1.16b, v1.16b
2: ld1 {v3.2d}, [x2], #16 /* load next round key */
aese v0.16b, v5.16b
aese v1.16b, v5.16b
aesmc v0.16b, v0.16b
aese v1.16b, v5.16b
aesmc v1.16b, v1.16b
3: ld1 {v4.2d}, [x2], #16 /* load next round key */
subs w3, w3, #3
aese v0.16b, v3.16b
aese v1.16b, v3.16b
aesmc v0.16b, v0.16b
aese v1.16b, v3.16b
aesmc v1.16b, v1.16b
bpl 1b
aese v0.16b, v4.16b
@ -146,19 +146,19 @@ ENDPROC(ce_aes_ccm_final)
ld1 {v5.2d}, [x10], #16 /* load 2nd round key */
2: /* inner loop: 3 rounds, 2x interleaved */
aese v0.16b, v4.16b
aese v1.16b, v4.16b
aesmc v0.16b, v0.16b
aese v1.16b, v4.16b
aesmc v1.16b, v1.16b
3: ld1 {v3.2d}, [x10], #16 /* load next round key */
aese v0.16b, v5.16b
aese v1.16b, v5.16b
aesmc v0.16b, v0.16b
aese v1.16b, v5.16b
aesmc v1.16b, v1.16b
4: ld1 {v4.2d}, [x10], #16 /* load next round key */
subs w7, w7, #3
aese v0.16b, v3.16b
aese v1.16b, v3.16b
aesmc v0.16b, v0.16b
aese v1.16b, v3.16b
aesmc v1.16b, v1.16b
ld1 {v5.2d}, [x10], #16 /* load next round key */
bpl 2b

10
arch/arm64/crypto/aes-ce.S
View File

@ -45,18 +45,14 @@
.macro do_enc_Nx, de, mc, k, i0, i1, i2, i3
aes\de \i0\().16b, \k\().16b
.ifnb \i1
aes\de \i1\().16b, \k\().16b
.ifnb \i3
aes\de \i2\().16b, \k\().16b
aes\de \i3\().16b, \k\().16b
.endif
.endif
aes\mc \i0\().16b, \i0\().16b
.ifnb \i1
aes\de \i1\().16b, \k\().16b
aes\mc \i1\().16b, \i1\().16b
.ifnb \i3
aes\de \i2\().16b, \k\().16b
aes\mc \i2\().16b, \i2\().16b
aes\de \i3\().16b, \k\().16b
aes\mc \i3\().16b, \i3\().16b
.endif
.endif

48
arch/arm64/include/asm/assembler.h
View File

@ -159,4 +159,52 @@ lr .req x30 // link register
orr \rd, \lbits, \hbits, lsl #32
.endm
/*
* Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
* <symbol> is within the range +/- 4 GB of the PC.
*/
/*
* @dst: destination register (64 bit wide)
* @sym: name of the symbol
* @tmp: optional scratch register to be used if <dst> == sp, which
* is not allowed in an adrp instruction
*/
.macro adr_l, dst, sym, tmp=
.ifb \tmp
adrp \dst, \sym
add \dst, \dst, :lo12:\sym
.else
adrp \tmp, \sym
add \dst, \tmp, :lo12:\sym
.endif
.endm
/*
* @dst: destination register (32 or 64 bit wide)
* @sym: name of the symbol
* @tmp: optional 64-bit scratch register to be used if <dst> is a
* 32-bit wide register, in which case it cannot be used to hold
* the address
*/
.macro ldr_l, dst, sym, tmp=
.ifb \tmp
adrp \dst, \sym
ldr \dst, [\dst, :lo12:\sym]
.else
adrp \tmp, \sym
ldr \dst, [\tmp, :lo12:\sym]
.endif
.endm
/*
* @src: source register (32 or 64 bit wide)
* @sym: name of the symbol
* @tmp: mandatory 64-bit scratch register to calculate the address
* while <src> needs to be preserved.
*/
.macro str_l, src, sym, tmp
adrp \tmp, \sym
str \src, [\tmp, :lo12:\sym]
.endm
#endif /* __ASM_ASSEMBLER_H */

18
arch/arm64/include/asm/cpufeature.h
View File

@ -23,11 +23,24 @@
#define ARM64_WORKAROUND_CLEAN_CACHE 0
#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
#define ARM64_WORKAROUND_845719 2
#define ARM64_NCAPS 2
#define ARM64_NCAPS 3
#ifndef __ASSEMBLY__
struct arm64_cpu_capabilities {
const char *desc;
u16 capability;
bool (*matches)(const struct arm64_cpu_capabilities *);
union {
struct { /* To be used for erratum handling only */
u32 midr_model;
u32 midr_range_min, midr_range_max;
};
};
};
extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
static inline bool cpu_have_feature(unsigned int num)
@ -51,7 +64,10 @@ static inline void cpus_set_cap(unsigned int num)
__set_bit(num, cpu_hwcaps);
}
void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
const char *info);
void check_local_cpu_errata(void);
void check_local_cpu_features(void);
bool cpu_supports_mixed_endian_el0(void);
bool system_supports_mixed_endian_el0(void);

30
arch/arm64/include/asm/cputable.h
View File

@ -1,30 +0,0 @@
/*
* arch/arm64/include/asm/cputable.h
*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_CPUTABLE_H
#define __ASM_CPUTABLE_H
struct cpu_info {
unsigned int cpu_id_val;
unsigned int cpu_id_mask;
const char *cpu_name;
unsigned long (*cpu_setup)(void);
};
extern struct cpu_info *lookup_processor_type(unsigned int);
#endif

2
arch/arm64/include/asm/dma-mapping.h
View File

@ -97,7 +97,7 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
return 0;
return false;
return addr + size - 1 <= *dev->dma_mask;
}

2
arch/arm64/include/asm/fixmap.h
View File

@ -33,6 +33,7 @@
enum fixed_addresses {
FIX_HOLE,
FIX_EARLYCON_MEM_BASE,
FIX_TEXT_POKE0,
__end_of_permanent_fixed_addresses,
/*
@ -49,7 +50,6 @@ enum fixed_addresses {
FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
FIX_TEXT_POKE0,
__end_of_fixed_addresses
};

1
arch/arm64/include/asm/insn.h
View File

@ -285,6 +285,7 @@ bool aarch64_insn_is_nop(u32 insn);
int aarch64_insn_read(void *addr, u32 *insnp);
int aarch64_insn_write(void *addr, u32 insn);
enum aarch64_insn_encoding_class aarch64_get_insn_class(u32 insn);
u64 aarch64_insn_decode_immediate(enum aarch64_insn_imm_type type, u32 insn);
u32 aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
u32 insn, u64 imm);
u32 aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr,

33
arch/arm64/include/asm/kvm_mmu.h
View File

@ -68,6 +68,8 @@
#include <asm/pgalloc.h>
#include <asm/cachetype.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET)
@ -269,5 +271,36 @@ static inline void __kvm_flush_dcache_pud(pud_t pud)
void kvm_set_way_flush(struct kvm_vcpu *vcpu);
void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
static inline bool __kvm_cpu_uses_extended_idmap(void)
{
return __cpu_uses_extended_idmap();
}
static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
pgd_t *hyp_pgd,
pgd_t *merged_hyp_pgd,
unsigned long hyp_idmap_start)
{
int idmap_idx;
/*
* Use the first entry to access the HYP mappings. It is
* guaranteed to be free, otherwise we wouldn't use an
* extended idmap.
*/
VM_BUG_ON(pgd_val(merged_hyp_pgd[0]));
merged_hyp_pgd[0] = __pgd(__pa(hyp_pgd) | PMD_TYPE_TABLE);
/*
* Create another extended level entry that points to the boot HYP map,
* which contains an ID mapping of the HYP init code. We essentially
* merge the boot and runtime HYP maps by doing so, but they don't
* overlap anyway, so this is fine.
*/
idmap_idx = hyp_idmap_start >> VA_BITS;
VM_BUG_ON(pgd_val(merged_hyp_pgd[idmap_idx]));
merged_hyp_pgd[idmap_idx] = __pgd(__pa(boot_hyp_pgd) | PMD_TYPE_TABLE);
}
#endif /* __ASSEMBLY__ */
#endif /* __ARM64_KVM_MMU_H__ */

43
arch/arm64/include/asm/mmu_context.h
View File

@ -64,6 +64,49 @@ static inline void cpu_set_reserved_ttbr0(void)
: "r" (ttbr));
}
/*
* TCR.T0SZ value to use when the ID map is active. Usually equals
* TCR_T0SZ(VA_BITS), unless system RAM is positioned very high in
* physical memory, in which case it will be smaller.
*/
extern u64 idmap_t0sz;
static inline bool __cpu_uses_extended_idmap(void)
{
return (!IS_ENABLED(CONFIG_ARM64_VA_BITS_48) &&
unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS)));
}
static inline void __cpu_set_tcr_t0sz(u64 t0sz)
{
unsigned long tcr;
if (__cpu_uses_extended_idmap())
asm volatile (
" mrs %0, tcr_el1 ;"
" bfi %0, %1, %2, %3 ;"
" msr tcr_el1, %0 ;"
" isb"
: "=&r" (tcr)
: "r"(t0sz), "I"(TCR_T0SZ_OFFSET), "I"(TCR_TxSZ_WIDTH));
}
/*
* Set TCR.T0SZ to the value appropriate for activating the identity map.
*/
static inline void cpu_set_idmap_tcr_t0sz(void)
{
__cpu_set_tcr_t0sz(idmap_t0sz);
}
/*
* Set TCR.T0SZ to its default value (based on VA_BITS)
*/
static inline void cpu_set_default_tcr_t0sz(void)
{
__cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS));
}
static inline void switch_new_context(struct mm_struct *mm)
{
unsigned long flags;

6
arch/arm64/include/asm/page.h
View File

@ -33,7 +33,9 @@
* image. Both require pgd, pud (4 levels only) and pmd tables to (section)
* map the kernel. With the 64K page configuration, swapper and idmap need to
* map to pte level. The swapper also maps the FDT (see __create_page_tables
* for more information).
* for more information). Note that the number of ID map translation levels
* could be increased on the fly if system RAM is out of reach for the default
* VA range, so 3 pages are reserved in all cases.
*/
#ifdef CONFIG_ARM64_64K_PAGES
#define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
@ -42,7 +44,7 @@
#endif
#define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE)
#define IDMAP_DIR_SIZE (SWAPPER_DIR_SIZE)
#define IDMAP_DIR_SIZE (3 * PAGE_SIZE)
#ifndef __ASSEMBLY__

7
arch/arm64/include/asm/pgtable-hwdef.h
View File

@ -143,7 +143,12 @@
/*
* TCR flags.
*/
#define TCR_TxSZ(x) (((UL(64) - (x)) << 16) | ((UL(64) - (x)) << 0))
#define TCR_T0SZ_OFFSET 0
#define TCR_T1SZ_OFFSET 16
#define TCR_T0SZ(x) ((UL(64) - (x)) << TCR_T0SZ_OFFSET)
#define TCR_T1SZ(x) ((UL(64) - (x)) << TCR_T1SZ_OFFSET)
#define TCR_TxSZ(x) (TCR_T0SZ(x) | TCR_T1SZ(x))
#define TCR_TxSZ_WIDTH 6
#define TCR_IRGN_NC ((UL(0) << 8) | (UL(0) << 24))
#define TCR_IRGN_WBWA ((UL(1) << 8) | (UL(1) << 24))
#define TCR_IRGN_WT ((UL(2) << 8) | (UL(2) << 24))

1
arch/arm64/include/asm/pmu.h
View File

@ -44,6 +44,7 @@ struct pmu_hw_events {
struct arm_pmu {
struct pmu pmu;
cpumask_t active_irqs;
int *irq_affinity;
const char *name;
irqreturn_t (*handle_irq)(int irq_num, void *dev);
void (*enable)(struct hw_perf_event *evt, int idx);

9
arch/arm64/include/asm/proc-fns.h
View File

@ -45,15 +45,6 @@ do { \
cpu_do_switch_mm(virt_to_phys(pgd),mm); \
} while (0)
#define cpu_get_pgd() \
({ \
unsigned long pg; \
asm("mrs %0, ttbr0_el1\n" \
: "=r" (pg)); \
pg &= ~0xffff000000003ffful; \
(pgd_t *)phys_to_virt(pg); \
})
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __ASM_PROCFNS_H */

6
arch/arm64/include/asm/processor.h
View File

@ -127,7 +127,11 @@ extern void release_thread(struct task_struct *);
unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
static inline void cpu_relax(void)
{
asm volatile("yield" ::: "memory");
}
#define cpu_relax_lowlatency() cpu_relax()
/* Thread switching */

2
arch/arm64/include/asm/smp_plat.h
View File

@ -40,4 +40,6 @@ static inline u32 mpidr_hash_size(void)
extern u64 __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
void __init do_post_cpus_up_work(void);
#endif /* __ASM_SMP_PLAT_H */

2
arch/arm64/include/asm/unistd32.h
View File

@ -406,7 +406,7 @@ __SYSCALL(__NR_vfork, sys_vfork)
#define __NR_ugetrlimit 191 /* SuS compliant getrlimit */
__SYSCALL(__NR_ugetrlimit, compat_sys_getrlimit) /* SuS compliant getrlimit */
#define __NR_mmap2 192
__SYSCALL(__NR_mmap2, sys_mmap_pgoff)
__SYSCALL(__NR_mmap2, compat_sys_mmap2_wrapper)
#define __NR_truncate64 193
__SYSCALL(__NR_truncate64, compat_sys_truncate64_wrapper)
#define __NR_ftruncate64 194

4
arch/arm64/kernel/Makefile
View File

@ -12,12 +12,12 @@ CFLAGS_REMOVE_insn.o = -pg
CFLAGS_REMOVE_return_address.o = -pg
# Object file lists.
arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \
arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
entry-fpsimd.o process.o ptrace.o setup.o signal.o \
sys.o stacktrace.o time.o traps.o io.o vdso.o \
hyp-stub.o psci.o psci-call.o cpu_ops.o insn.o \
return_address.o cpuinfo.o cpu_errata.o \
alternative.o cacheinfo.o
cpufeature.o alternative.o cacheinfo.o
arm64-obj-$(CONFIG_COMPAT) += sys32.o kuser32.o signal32.o \
sys_compat.o entry32.o \

55
arch/arm64/kernel/alternative.c
View File

@ -24,6 +24,7 @@
#include <asm/cacheflush.h>
#include <asm/alternative.h>
#include <asm/cpufeature.h>
#include <asm/insn.h>
#include <linux/stop_machine.h>
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
@ -33,6 +34,48 @@ struct alt_region {
struct alt_instr *end;
};
/*
* Decode the imm field of a b/bl instruction, and return the byte
* offset as a signed value (so it can be used when computing a new
* branch target).
*/
static s32 get_branch_offset(u32 insn)
{
s32 imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_26, insn);
/* sign-extend the immediate before turning it into a byte offset */
return (imm << 6) >> 4;
}
static u32 get_alt_insn(u8 *insnptr, u8 *altinsnptr)
{
u32 insn;
aarch64_insn_read(altinsnptr, &insn);
/* Stop the world on instructions we don't support... */
BUG_ON(aarch64_insn_is_cbz(insn));
BUG_ON(aarch64_insn_is_cbnz(insn));
BUG_ON(aarch64_insn_is_bcond(insn));
/* ... and there is probably more. */
if (aarch64_insn_is_b(insn) || aarch64_insn_is_bl(insn)) {
enum aarch64_insn_branch_type type;
unsigned long target;
if (aarch64_insn_is_b(insn))
type = AARCH64_INSN_BRANCH_NOLINK;
else
type = AARCH64_INSN_BRANCH_LINK;
target = (unsigned long)altinsnptr + get_branch_offset(insn);
insn = aarch64_insn_gen_branch_imm((unsigned long)insnptr,
target, type);
}
return insn;
}
static int __apply_alternatives(void *alt_region)
{
struct alt_instr *alt;
@ -40,16 +83,24 @@ static int __apply_alternatives(void *alt_region)
u8 *origptr, *replptr;
for (alt = region->begin; alt < region->end; alt++) {
u32 insn;
int i;
if (!cpus_have_cap(alt->cpufeature))
continue;
BUG_ON(alt->alt_len > alt->orig_len);
BUG_ON(alt->alt_len != alt->orig_len);
pr_info_once("patching kernel code\n");
origptr = (u8 *)&alt->orig_offset + alt->orig_offset;
replptr = (u8 *)&alt->alt_offset + alt->alt_offset;
memcpy(origptr, replptr, alt->alt_len);
for (i = 0; i < alt->alt_len; i += sizeof(insn)) {
insn = get_alt_insn(origptr + i, replptr + i);
aarch64_insn_write(origptr + i, insn);
}
flush_icache_range((uintptr_t)origptr,
(uintptr_t)(origptr + alt->alt_len));
}

4
arch/arm64/kernel/asm-offsets.c
View File

@ -24,7 +24,6 @@
#include <linux/kvm_host.h>
#include <asm/thread_info.h>
#include <asm/memory.h>
#include <asm/cputable.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>
#include <asm/vdso_datapage.h>
@ -70,9 +69,6 @@ int main(void)
BLANK();
DEFINE(PAGE_SZ, PAGE_SIZE);
BLANK();
DEFINE(CPU_INFO_SZ, sizeof(struct cpu_info));
DEFINE(CPU_INFO_SETUP, offsetof(struct cpu_info, cpu_setup));
BLANK();
DEFINE(DMA_BIDIRECTIONAL, DMA_BIDIRECTIONAL);
DEFINE(DMA_TO_DEVICE, DMA_TO_DEVICE);
DEFINE(DMA_FROM_DEVICE, DMA_FROM_DEVICE);

47
arch/arm64/kernel/cpu_errata.c
View File

@ -16,8 +16,6 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) "alternatives: " fmt
#include <linux/types.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
@ -26,27 +24,11 @@
#define MIDR_CORTEX_A53 MIDR_CPU_PART(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53)
#define MIDR_CORTEX_A57 MIDR_CPU_PART(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A57)
/*
* Add a struct or another datatype to the union below if you need
* different means to detect an affected CPU.
*/
struct arm64_cpu_capabilities {
const char *desc;
u16 capability;
bool (*is_affected)(struct arm64_cpu_capabilities *);
union {
struct {
u32 midr_model;
u32 midr_range_min, midr_range_max;
};
};
};
#define CPU_MODEL_MASK (MIDR_IMPLEMENTOR_MASK | MIDR_PARTNUM_MASK | \
MIDR_ARCHITECTURE_MASK)
static bool __maybe_unused
is_affected_midr_range(struct arm64_cpu_capabilities *entry)
is_affected_midr_range(const struct arm64_cpu_capabilities *entry)
{
u32 midr = read_cpuid_id();
@ -59,12 +41,12 @@ is_affected_midr_range(struct arm64_cpu_capabilities *entry)
}
#define MIDR_RANGE(model, min, max) \
.is_affected = is_affected_midr_range, \
.matches = is_affected_midr_range, \
.midr_model = model, \
.midr_range_min = min, \
.midr_range_max = max
struct arm64_cpu_capabilities arm64_errata[] = {
const struct arm64_cpu_capabilities arm64_errata[] = {
#if defined(CONFIG_ARM64_ERRATUM_826319) || \
defined(CONFIG_ARM64_ERRATUM_827319) || \
defined(CONFIG_ARM64_ERRATUM_824069)
@ -88,7 +70,16 @@ struct arm64_cpu_capabilities arm64_errata[] = {
/* Cortex-A57 r0p0 - r1p2 */
.desc = "ARM erratum 832075",
.capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
MIDR_RANGE(MIDR_CORTEX_A57, 0x00, 0x12),
MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
(1 << MIDR_VARIANT_SHIFT) | 2),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_845719
{
/* Cortex-A53 r0p[01234] */
.desc = "ARM erratum 845719",
.capability = ARM64_WORKAROUND_845719,
MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x04),
},
#endif
{
@ -97,15 +88,5 @@ struct arm64_cpu_capabilities arm64_errata[] = {
void check_local_cpu_errata(void)
{
struct arm64_cpu_capabilities *cpus = arm64_errata;
int i;
for (i = 0; cpus[i].desc; i++) {
if (!cpus[i].is_affected(&cpus[i]))
continue;
if (!cpus_have_cap(cpus[i].capability))
pr_info("enabling workaround for %s\n", cpus[i].desc);
cpus_set_cap(cpus[i].capability);
}
check_cpu_capabilities(arm64_errata, "enabling workaround for");
}

47
arch/arm64/kernel/cpufeature.c Normal file
View File

@ -0,0 +1,47 @@
/*
* Contains CPU feature definitions
*
* Copyright (C) 2015 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) "alternatives: " fmt
#include <linux/types.h>
#include <asm/cpu.h>
#include <asm/cpufeature.h>
static const struct arm64_cpu_capabilities arm64_features[] = {
{},
};
void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
const char *info)
{
int i;
for (i = 0; caps[i].desc; i++) {
if (!caps[i].matches(&caps[i]))
continue;
if (!cpus_have_cap(caps[i].capability))
pr_info("%s %s\n", info, caps[i].desc);
cpus_set_cap(caps[i].capability);
}
}
void check_local_cpu_features(void)
{
check_cpu_capabilities(arm64_features, "detected feature");
}

1
arch/arm64/kernel/cpuinfo.c
View File

@ -236,6 +236,7 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info)
cpuinfo_detect_icache_policy(info);
check_local_cpu_errata();
check_local_cpu_features();
update_cpu_features(info);
}

33
arch/arm64/kernel/cputable.c
View File

@ -1,33 +0,0 @@
/*
* arch/arm64/kernel/cputable.c
*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/init.h>
#include <asm/cputable.h>
extern unsigned long __cpu_setup(void);
struct cpu_info cpu_table[] = {
{
.cpu_id_val = 0x000f0000,
.cpu_id_mask = 0x000f0000,
.cpu_name = "AArch64 Processor",
.cpu_setup = __cpu_setup,
},
{ /* Empty */ },
};

20
arch/arm64/kernel/entry.S
View File

@ -21,8 +21,10 @@
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/alternative-asm.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/cpufeature.h>
#include <asm/errno.h>
#include <asm/esr.h>
#include <asm/thread_info.h>
@ -120,6 +122,24 @@
ct_user_enter
ldr x23, [sp, #S_SP] // load return stack pointer
msr sp_el0, x23
#ifdef CONFIG_ARM64_ERRATUM_845719
alternative_insn \
"nop", \
"tbz x22, #4, 1f", \
ARM64_WORKAROUND_845719
#ifdef CONFIG_PID_IN_CONTEXTIDR
alternative_insn \
"nop; nop", \
"mrs x29, contextidr_el1; msr contextidr_el1, x29; 1:", \
ARM64_WORKAROUND_845719
#else
alternative_insn \
"nop", \
"msr contextidr_el1, xzr; 1:", \
ARM64_WORKAROUND_845719
#endif
#endif
.endif
msr elr_el1, x21 // set up the return data
msr spsr_el1, x22

18
arch/arm64/kernel/entry32.S
View File

@ -19,9 +19,12 @@
*/
#include <linux/linkage.h>
#include <linux/const.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/page.h>
/*
* System call wrappers for the AArch32 compatibility layer.
@ -53,6 +56,21 @@ ENTRY(compat_sys_fstatfs64_wrapper)
b compat_sys_fstatfs64
ENDPROC(compat_sys_fstatfs64_wrapper)
/*
* Note: off_4k (w5) is always in units of 4K. If we can't do the
* requested offset because it is not page-aligned, we return -EINVAL.
*/
ENTRY(compat_sys_mmap2_wrapper)
#if PAGE_SHIFT > 12
tst w5, #~PAGE_MASK >> 12
b.ne 1f
lsr w5, w5, #PAGE_SHIFT - 12
#endif
b sys_mmap_pgoff
1: mov x0, #-EINVAL
ret
ENDPROC(compat_sys_mmap2_wrapper)
/*
* Wrappers for AArch32 syscalls that either take 64-bit parameters
* in registers or that take 32-bit parameters which require sign

261
arch/arm64/kernel/head.S
View File

@ -36,7 +36,7 @@
#include <asm/page.h>
#include <asm/virt.h>
#define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET)
#define __PHYS_OFFSET (KERNEL_START - TEXT_OFFSET)
#if (TEXT_OFFSET & 0xfff) != 0
#error TEXT_OFFSET must be at least 4KB aligned
@ -46,13 +46,6 @@
#error TEXT_OFFSET must be less than 2MB
#endif
.macro pgtbl, ttb0, ttb1, virt_to_phys
ldr \ttb1, =swapper_pg_dir
ldr \ttb0, =idmap_pg_dir
add \ttb1, \ttb1, \virt_to_phys
add \ttb0, \ttb0, \virt_to_phys
.endm
#ifdef CONFIG_ARM64_64K_PAGES
#define BLOCK_SHIFT PAGE_SHIFT
#define BLOCK_SIZE PAGE_SIZE
@ -63,7 +56,7 @@
#define TABLE_SHIFT PUD_SHIFT
#endif
#define KERNEL_START KERNEL_RAM_VADDR
#define KERNEL_START _text
#define KERNEL_END _end
/*
@ -240,39 +233,42 @@ section_table:
#endif
ENTRY(stext)
mov x21, x0 // x21=FDT
bl preserve_boot_args
bl el2_setup // Drop to EL1, w20=cpu_boot_mode
bl __calc_phys_offset // x24=PHYS_OFFSET, x28=PHYS_OFFSET-PAGE_OFFSET
adrp x24, __PHYS_OFFSET
bl set_cpu_boot_mode_flag
mrs x22, midr_el1 // x22=cpuid
mov x0, x22
bl lookup_processor_type
mov x23, x0 // x23=current cpu_table
/*
* __error_p may end up out of range for cbz if text areas are
* aligned up to section sizes.
*/
cbnz x23, 1f // invalid processor (x23=0)?
b __error_p
1:
bl __vet_fdt
bl __create_page_tables // x25=TTBR0, x26=TTBR1
/*
* The following calls CPU specific code in a position independent
* manner. See arch/arm64/mm/proc.S for details. x23 = base of
* cpu_info structure selected by lookup_processor_type above.
* The following calls CPU setup code, see arch/arm64/mm/proc.S for
* details.
* On return, the CPU will be ready for the MMU to be turned on and
* the TCR will have been set.
*/
ldr x27, __switch_data // address to jump to after
ldr x27, =__mmap_switched // address to jump to after
// MMU has been enabled
adrp lr, __enable_mmu // return (PIC) address
add lr, lr, #:lo12:__enable_mmu
ldr x12, [x23, #CPU_INFO_SETUP]
add x12, x12, x28 // __virt_to_phys
br x12 // initialise processor
adr_l lr, __enable_mmu // return (PIC) address
b __cpu_setup // initialise processor
ENDPROC(stext)
/*
* Preserve the arguments passed by the bootloader in x0 .. x3
*/
preserve_boot_args:
mov x21, x0 // x21=FDT
adr_l x0, boot_args // record the contents of
stp x21, x1, [x0] // x0 .. x3 at kernel entry
stp x2, x3, [x0, #16]
dmb sy // needed before dc ivac with
// MMU off
add x1, x0, #0x20 // 4 x 8 bytes
b __inval_cache_range // tail call
ENDPROC(preserve_boot_args)
/*
* Determine validity of the x21 FDT pointer.
* The dtb must be 8-byte aligned and live in the first 512M of memory.
@ -356,7 +352,8 @@ ENDPROC(__vet_fdt)
* - pgd entry for fixed mappings (TTBR1)
*/
__create_page_tables:
pgtbl x25, x26, x28 // idmap_pg_dir and swapper_pg_dir addresses
adrp x25, idmap_pg_dir
adrp x26, swapper_pg_dir
mov x27, lr
/*
@ -385,12 +382,50 @@ __create_page_tables:
* Create the identity mapping.
*/
mov x0, x25 // idmap_pg_dir
ldr x3, =KERNEL_START
add x3, x3, x28 // __pa(KERNEL_START)
adrp x3, KERNEL_START // __pa(KERNEL_START)
#ifndef CONFIG_ARM64_VA_BITS_48
#define EXTRA_SHIFT (PGDIR_SHIFT + PAGE_SHIFT - 3)
#define EXTRA_PTRS (1 << (48 - EXTRA_SHIFT))
/*
* If VA_BITS < 48, it may be too small to allow for an ID mapping to be
* created that covers system RAM if that is located sufficiently high
* in the physical address space. So for the ID map, use an extended
* virtual range in that case, by configuring an additional translation
* level.
* First, we have to verify our assumption that the current value of
* VA_BITS was chosen such that all translation levels are fully
* utilised, and that lowering T0SZ will always result in an additional
* translation level to be configured.
*/
#if VA_BITS != EXTRA_SHIFT
#error "Mismatch between VA_BITS and page size/number of translation levels"
#endif
/*
* Calculate the maximum allowed value for TCR_EL1.T0SZ so that the
* entire kernel image can be ID mapped. As T0SZ == (64 - #bits used),
* this number conveniently equals the number of leading zeroes in
* the physical address of KERNEL_END.
*/
adrp x5, KERNEL_END
clz x5, x5
cmp x5, TCR_T0SZ(VA_BITS) // default T0SZ small enough?
b.ge 1f // .. then skip additional level
adr_l x6, idmap_t0sz
str x5, [x6]
dmb sy
dc ivac, x6 // Invalidate potentially stale cache line
create_table_entry x0, x3, EXTRA_SHIFT, EXTRA_PTRS, x5, x6
1:
#endif
create_pgd_entry x0, x3, x5, x6
ldr x6, =KERNEL_END
mov x5, x3 // __pa(KERNEL_START)
add x6, x6, x28 // __pa(KERNEL_END)
adr_l x6, KERNEL_END // __pa(KERNEL_END)
create_block_map x0, x7, x3, x5, x6
/*
@ -399,7 +434,7 @@ __create_page_tables:
mov x0, x26 // swapper_pg_dir
mov x5, #PAGE_OFFSET
create_pgd_entry x0, x5, x3, x6
ldr x6, =KERNEL_END
ldr x6, =KERNEL_END // __va(KERNEL_END)
mov x3, x24 // phys offset
create_block_map x0, x7, x3, x5, x6
@ -426,6 +461,7 @@ __create_page_tables:
*/
mov x0, x25
add x1, x26, #SWAPPER_DIR_SIZE
dmb sy
bl __inval_cache_range
mov lr, x27
@ -433,37 +469,22 @@ __create_page_tables:
ENDPROC(__create_page_tables)
.ltorg
.align 3
.type __switch_data, %object
__switch_data:
.quad __mmap_switched
.quad __bss_start // x6
.quad __bss_stop // x7
.quad processor_id // x4
.quad __fdt_pointer // x5
.quad memstart_addr // x6
.quad init_thread_union + THREAD_START_SP // sp
/*
* The following fragment of code is executed with the MMU on in MMU mode, and
* uses absolute addresses; this is not position independent.
* The following fragment of code is executed with the MMU enabled.
*/
.set initial_sp, init_thread_union + THREAD_START_SP
__mmap_switched:
adr x3, __switch_data + 8
adr_l x6, __bss_start
adr_l x7, __bss_stop
ldp x6, x7, [x3], #16
1: cmp x6, x7
b.hs 2f
str xzr, [x6], #8 // Clear BSS
b 1b
2:
ldp x4, x5, [x3], #16
ldr x6, [x3], #8
ldr x16, [x3]
mov sp, x16
str x22, [x4] // Save processor ID
str x21, [x5] // Save FDT pointer
str x24, [x6] // Save PHYS_OFFSET
adr_l sp, initial_sp, x4
str_l x21, __fdt_pointer, x5 // Save FDT pointer
str_l x24, memstart_addr, x6 // Save PHYS_OFFSET
mov x29, #0
b start_kernel
ENDPROC(__mmap_switched)
@ -566,8 +587,7 @@ ENDPROC(el2_setup)
* in x20. See arch/arm64/include/asm/virt.h for more info.
*/
ENTRY(set_cpu_boot_mode_flag)
ldr x1, =__boot_cpu_mode // Compute __boot_cpu_mode
add x1, x1, x28
adr_l x1, __boot_cpu_mode
cmp w20, #BOOT_CPU_MODE_EL2
b.ne 1f
add x1, x1, #4
@ -588,29 +608,21 @@ ENDPROC(set_cpu_boot_mode_flag)
.align L1_CACHE_SHIFT
ENTRY(__boot_cpu_mode)
.long BOOT_CPU_MODE_EL2
.long 0
.long BOOT_CPU_MODE_EL1
.popsection
#ifdef CONFIG_SMP
.align 3
1: .quad .
.quad secondary_holding_pen_release
/*
* This provides a "holding pen" for platforms to hold all secondary
* cores are held until we're ready for them to initialise.
*/
ENTRY(secondary_holding_pen)
bl el2_setup // Drop to EL1, w20=cpu_boot_mode
bl __calc_phys_offset // x24=PHYS_OFFSET, x28=PHYS_OFFSET-PAGE_OFFSET
bl set_cpu_boot_mode_flag
mrs x0, mpidr_el1
ldr x1, =MPIDR_HWID_BITMASK
and x0, x0, x1
adr x1, 1b
ldp x2, x3, [x1]
sub x1, x1, x2
add x3, x3, x1
adr_l x3, secondary_holding_pen_release
pen: ldr x4, [x3]
cmp x4, x0
b.eq secondary_startup
@ -624,7 +636,6 @@ ENDPROC(secondary_holding_pen)
*/
ENTRY(secondary_entry)
bl el2_setup // Drop to EL1
bl __calc_phys_offset // x24=PHYS_OFFSET, x28=PHYS_OFFSET-PAGE_OFFSET
bl set_cpu_boot_mode_flag
b secondary_startup
ENDPROC(secondary_entry)
@ -633,16 +644,9 @@ ENTRY(secondary_startup)
/*
* Common entry point for secondary CPUs.
*/
mrs x22, midr_el1 // x22=cpuid
mov x0, x22
bl lookup_processor_type
mov x23, x0 // x23=current cpu_table
cbz x23, __error_p // invalid processor (x23=0)?
pgtbl x25, x26, x28 // x25=TTBR0, x26=TTBR1
ldr x12, [x23, #CPU_INFO_SETUP]
add x12, x12, x28 // __virt_to_phys
blr x12 // initialise processor
adrp x25, idmap_pg_dir
adrp x26, swapper_pg_dir
bl __cpu_setup // initialise processor
ldr x21, =secondary_data
ldr x27, =__secondary_switched // address to jump to after enabling the MMU
@ -658,11 +662,12 @@ ENDPROC(__secondary_switched)
#endif /* CONFIG_SMP */
/*
* Setup common bits before finally enabling the MMU. Essentially this is just
* loading the page table pointer and vector base registers.
* Enable the MMU.
*
* On entry to this code, x0 must contain the SCTLR_EL1 value for turning on
* the MMU.
* x0 = SCTLR_EL1 value for turning on the MMU.
* x27 = *virtual* address to jump to upon completion
*
* other registers depend on the function called upon completion
*/
__enable_mmu:
ldr x5, =vectors
@ -670,89 +675,7 @@ __enable_mmu:
msr ttbr0_el1, x25 // load TTBR0
msr ttbr1_el1, x26 // load TTBR1
isb
b __turn_mmu_on
ENDPROC(__enable_mmu)
/*
* Enable the MMU. This completely changes the structure of the visible memory
* space. You will not be able to trace execution through this.
*
* x0 = system control register
* x27 = *virtual* address to jump to upon completion
*
* other registers depend on the function called upon completion
*
* We align the entire function to the smallest power of two larger than it to
* ensure it fits within a single block map entry. Otherwise were PHYS_OFFSET
* close to the end of a 512MB or 1GB block we might require an additional
* table to map the entire function.
*/
.align 4
__turn_mmu_on:
msr sctlr_el1, x0
isb
br x27
ENDPROC(__turn_mmu_on)
/*
* Calculate the start of physical memory.
*/
__calc_phys_offset:
adr x0, 1f
ldp x1, x2, [x0]
sub x28, x0, x1 // x28 = PHYS_OFFSET - PAGE_OFFSET
add x24, x2, x28 // x24 = PHYS_OFFSET
ret
ENDPROC(__calc_phys_offset)
.align 3
1: .quad .
.quad PAGE_OFFSET
/*
* Exception handling. Something went wrong and we can't proceed. We ought to
* tell the user, but since we don't have any guarantee that we're even
* running on the right architecture, we do virtually nothing.
*/
__error_p:
ENDPROC(__error_p)
__error:
1: nop
b 1b
ENDPROC(__error)
/*
* This function gets the processor ID in w0 and searches the cpu_table[] for
* a match. It returns a pointer to the struct cpu_info it found. The
* cpu_table[] must end with an empty (all zeros) structure.
*
* This routine can be called via C code and it needs to work with the MMU
* both disabled and enabled (the offset is calculated automatically).
*/
ENTRY(lookup_processor_type)
adr x1, __lookup_processor_type_data
ldp x2, x3, [x1]
sub x1, x1, x2 // get offset between VA and PA
add x3, x3, x1 // convert VA to PA
1:
ldp w5, w6, [x3] // load cpu_id_val and cpu_id_mask
cbz w5, 2f // end of list?
and w6, w6, w0
cmp w5, w6
b.eq 3f
add x3, x3, #CPU_INFO_SZ
b 1b
2:
mov x3, #0 // unknown processor
3:
mov x0, x3
ret
ENDPROC(lookup_processor_type)
.align 3
.type __lookup_processor_type_data, %object
__lookup_processor_type_data:
.quad .
.quad cpu_table
.size __lookup_processor_type_data, . - __lookup_processor_type_data
ENDPROC(__enable_mmu)

81
arch/arm64/kernel/insn.c
View File

@ -265,23 +265,13 @@ int __kprobes aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt)
return aarch64_insn_patch_text_sync(addrs, insns, cnt);
}
u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
u32 insn, u64 imm)
static int __kprobes aarch64_get_imm_shift_mask(enum aarch64_insn_imm_type type,
u32 *maskp, int *shiftp)
{
u32 immlo, immhi, lomask, himask, mask;
u32 mask;
int shift;
switch (type) {
case AARCH64_INSN_IMM_ADR:
lomask = 0x3;
himask = 0x7ffff;
immlo = imm & lomask;
imm >>= 2;
immhi = imm & himask;
imm = (immlo << 24) | (immhi);
mask = (lomask << 24) | (himask);
shift = 5;
break;
case AARCH64_INSN_IMM_26:
mask = BIT(26) - 1;
shift = 0;
@ -320,9 +310,68 @@ u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
shift = 16;
break;
default:
pr_err("aarch64_insn_encode_immediate: unknown immediate encoding %d\n",
type);
return 0;
return -EINVAL;
}
*maskp = mask;
*shiftp = shift;
return 0;
}
#define ADR_IMM_HILOSPLIT 2
#define ADR_IMM_SIZE SZ_2M
#define ADR_IMM_LOMASK ((1 << ADR_IMM_HILOSPLIT) - 1)
#define ADR_IMM_HIMASK ((ADR_IMM_SIZE >> ADR_IMM_HILOSPLIT) - 1)
#define ADR_IMM_LOSHIFT 29
#define ADR_IMM_HISHIFT 5
u64 aarch64_insn_decode_immediate(enum aarch64_insn_imm_type type, u32 insn)
{
u32 immlo, immhi, mask;
int shift;
switch (type) {
case AARCH64_INSN_IMM_ADR:
shift = 0;
immlo = (insn >> ADR_IMM_LOSHIFT) & ADR_IMM_LOMASK;
immhi = (insn >> ADR_IMM_HISHIFT) & ADR_IMM_HIMASK;
insn = (immhi << ADR_IMM_HILOSPLIT) | immlo;
mask = ADR_IMM_SIZE - 1;
break;
default:
if (aarch64_get_imm_shift_mask(type, &mask, &shift) < 0) {
pr_err("aarch64_insn_decode_immediate: unknown immediate encoding %d\n",
type);
return 0;
}
}
return (insn >> shift) & mask;
}
u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type,
u32 insn, u64 imm)
{
u32 immlo, immhi, mask;
int shift;
switch (type) {
case AARCH64_INSN_IMM_ADR:
shift = 0;
immlo = (imm & ADR_IMM_LOMASK) << ADR_IMM_LOSHIFT;
imm >>= ADR_IMM_HILOSPLIT;
immhi = (imm & ADR_IMM_HIMASK) << ADR_IMM_HISHIFT;
imm = immlo | immhi;
mask = ((ADR_IMM_LOMASK << ADR_IMM_LOSHIFT) |
(ADR_IMM_HIMASK << ADR_IMM_HISHIFT));
break;
default:
if (aarch64_get_imm_shift_mask(type, &mask, &shift) < 0) {
pr_err("aarch64_insn_encode_immediate: unknown immediate encoding %d\n",
type);
return 0;
}
}
/* Update the immediate field. */

78
arch/arm64/kernel/perf_event.c
View File

@ -25,8 +25,10 @@
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
@ -322,22 +324,31 @@ out:
}
static int
validate_event(struct pmu_hw_events *hw_events,
struct perf_event *event)
validate_event(struct pmu *pmu, struct pmu_hw_events *hw_events,
struct perf_event *event)
{
struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
struct arm_pmu *armpmu;
struct hw_perf_event fake_event = event->hw;
struct pmu *leader_pmu = event->group_leader->pmu;
if (is_software_event(event))
return 1;
/*
* Reject groups spanning multiple HW PMUs (e.g. CPU + CCI). The
* core perf code won't check that the pmu->ctx == leader->ctx
* until after pmu->event_init(event).
*/
if (event->pmu != pmu)
return 0;
if (event->pmu != leader_pmu || event->state < PERF_EVENT_STATE_OFF)
return 1;
if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
return 1;
armpmu = to_arm_pmu(event->pmu);
return armpmu->get_event_idx(hw_events, &fake_event) >= 0;
}
@ -355,15 +366,15 @@ validate_group(struct perf_event *event)
memset(fake_used_mask, 0, sizeof(fake_used_mask));
fake_pmu.used_mask = fake_used_mask;
if (!validate_event(&fake_pmu, leader))
if (!validate_event(event->pmu, &fake_pmu, leader))
return -EINVAL;
list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
if (!validate_event(&fake_pmu, sibling))
if (!validate_event(event->pmu, &fake_pmu, sibling))
return -EINVAL;
}
if (!validate_event(&fake_pmu, event))
if (!validate_event(event->pmu, &fake_pmu, event))
return -EINVAL;
return 0;
@ -396,7 +407,12 @@ armpmu_release_hardware(struct arm_pmu *armpmu)
free_percpu_irq(irq, &cpu_hw_events);
} else {
for (i = 0; i < irqs; ++i) {
if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
int cpu = i;
if (armpmu->irq_affinity)
cpu = armpmu->irq_affinity[i];
if (!cpumask_test_and_clear_cpu(cpu, &armpmu->active_irqs))
continue;
irq = platform_get_irq(pmu_device, i);
if (irq > 0)
@ -450,19 +466,24 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
on_each_cpu(armpmu_enable_percpu_irq, &irq, 1);
} else {
for (i = 0; i < irqs; ++i) {
int cpu = i;
err = 0;
irq = platform_get_irq(pmu_device, i);
if (irq <= 0)
continue;
if (armpmu->irq_affinity)
cpu = armpmu->irq_affinity[i];
/*
* If we have a single PMU interrupt that we can't shift,
* assume that we're running on a uniprocessor machine and
* continue. Otherwise, continue without this interrupt.
*/
if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
if (irq_set_affinity(irq, cpumask_of(cpu)) && irqs > 1) {
pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
irq, i);
irq, cpu);
continue;
}
@ -476,7 +497,7 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
return err;
}
cpumask_set_cpu(i, &armpmu->active_irqs);
cpumask_set_cpu(cpu, &armpmu->active_irqs);
}
}
@ -1289,9 +1310,46 @@ static const struct of_device_id armpmu_of_device_ids[] = {
static int armpmu_device_probe(struct platform_device *pdev)
{
int i, *irqs;
if (!cpu_pmu)
return -ENODEV;
irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
if (!irqs)
return -ENOMEM;
for (i = 0; i < pdev->num_resources; ++i) {
struct device_node *dn;
int cpu;
dn = of_parse_phandle(pdev->dev.of_node, "interrupt-affinity",
i);
if (!dn) {
pr_warn("Failed to parse %s/interrupt-affinity[%d]\n",
of_node_full_name(dn), i);
break;
}
for_each_possible_cpu(cpu)
if (arch_find_n_match_cpu_physical_id(dn, cpu, NULL))
break;
of_node_put(dn);
if (cpu >= nr_cpu_ids) {
pr_warn("Failed to find logical CPU for %s\n",
dn->name);
break;
}
irqs[i] = cpu;
}
if (i == pdev->num_resources)
cpu_pmu->irq_affinity = irqs;
else
kfree(irqs);
cpu_pmu->plat_device = pdev;
return 0;
}

55
arch/arm64/kernel/setup.c
View File

@ -50,7 +50,6 @@
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/cpufeature.h>
#include <asm/cpu_ops.h>
#include <asm/sections.h>
@ -62,9 +61,7 @@
#include <asm/memblock.h>
#include <asm/psci.h>
#include <asm/efi.h>
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
#include <asm/virt.h>
unsigned long elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
@ -83,7 +80,6 @@ unsigned int compat_elf_hwcap2 __read_mostly;
DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);
static const char *cpu_name;
phys_addr_t __fdt_pointer __initdata;
/*
@ -119,6 +115,11 @@ void __init early_print(const char *str, ...)
printk("%s", buf);
}
/*
* The recorded values of x0 .. x3 upon kernel entry.
*/
u64 __cacheline_aligned boot_args[4];
void __init smp_setup_processor_id(void)
{
u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
@ -207,24 +208,38 @@ static void __init smp_build_mpidr_hash(void)
}
#endif
static void __init hyp_mode_check(void)
{
if (is_hyp_mode_available())
pr_info("CPU: All CPU(s) started at EL2\n");
else if (is_hyp_mode_mismatched())
WARN_TAINT(1, TAINT_CPU_OUT_OF_SPEC,
"CPU: CPUs started in inconsistent modes");
else
pr_info("CPU: All CPU(s) started at EL1\n");
}
void __init do_post_cpus_up_work(void)
{
hyp_mode_check();
apply_alternatives_all();
}
#ifdef CONFIG_UP_LATE_INIT
void __init up_late_init(void)
{
do_post_cpus_up_work();
}
#endif /* CONFIG_UP_LATE_INIT */
static void __init setup_processor(void)
{
struct cpu_info *cpu_info;
u64 features, block;
u32 cwg;
int cls;
cpu_info = lookup_processor_type(read_cpuid_id());
if (!cpu_info) {
printk("CPU configuration botched (ID %08x), unable to continue.\n",
read_cpuid_id());
while (1);
}
cpu_name = cpu_info->cpu_name;
printk("CPU: %s [%08x] revision %d\n",
cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
printk("CPU: AArch64 Processor [%08x] revision %d\n",
read_cpuid_id(), read_cpuid_id() & 15);
sprintf(init_utsname()->machine, ELF_PLATFORM);
elf_hwcap = 0;
@ -402,6 +417,12 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &dummy_con;
#endif
#endif
if (boot_args[1] || boot_args[2] || boot_args[3]) {
pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
"\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
"This indicates a broken bootloader or old kernel\n",
boot_args[1], boot_args[2], boot_args[3]);
}
}
static int __init arm64_device_init(void)

3
arch/arm64/kernel/smp.c
View File

@ -151,6 +151,7 @@ asmlinkage void secondary_start_kernel(void)
*/
cpu_set_reserved_ttbr0();
flush_tlb_all();
cpu_set_default_tcr_t0sz();
preempt_disable();
trace_hardirqs_off();
@ -309,7 +310,7 @@ void cpu_die(void)
void __init smp_cpus_done(unsigned int max_cpus)
{
pr_info("SMP: Total of %d processors activated.\n", num_online_cpus());
apply_alternatives_all();
do_post_cpus_up_work();
}
void __init smp_prepare_boot_cpu(void)

1
arch/arm64/kernel/sys32.c
View File

@ -37,6 +37,7 @@ asmlinkage long compat_sys_readahead_wrapper(void);
asmlinkage long compat_sys_fadvise64_64_wrapper(void);
asmlinkage long compat_sys_sync_file_range2_wrapper(void);
asmlinkage long compat_sys_fallocate_wrapper(void);
asmlinkage long compat_sys_mmap2_wrapper(void);
#undef __SYSCALL
#define __SYSCALL(nr, sym) [nr] = sym,

17
arch/arm64/kernel/vmlinux.lds.S
View File

@ -23,10 +23,14 @@ jiffies = jiffies_64;
#define HYPERVISOR_TEXT \
/* \
* Force the alignment to be compatible with \
* the vectors requirements \
* Align to 4 KB so that \
* a) the HYP vector table is at its minimum \
* alignment of 2048 bytes \
* b) the HYP init code will not cross a page \
* boundary if its size does not exceed \
* 4 KB (see related ASSERT() below) \
*/ \
. = ALIGN(2048); \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \
@ -163,10 +167,11 @@ SECTIONS
}
/*
* The HYP init code can't be more than a page long.
* The HYP init code can't be more than a page long,
* and should not cross a page boundary.
*/
ASSERT(((__hyp_idmap_text_start + PAGE_SIZE) > __hyp_idmap_text_end),
"HYP init code too big")
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"HYP init code too big or misaligned")
/*
* If padding is applied before .head.text, virt<->phys conversions will fail.

25
arch/arm64/kvm/hyp-init.S
View File

@ -20,6 +20,7 @@
#include <asm/assembler.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
#include <asm/pgtable-hwdef.h>
.text
.pushsection .hyp.idmap.text, "ax"
@ -65,6 +66,25 @@ __do_hyp_init:
and x4, x4, x5
ldr x5, =TCR_EL2_FLAGS
orr x4, x4, x5
#ifndef CONFIG_ARM64_VA_BITS_48
/*
* If we are running with VA_BITS < 48, we may be running with an extra
* level of translation in the ID map. This is only the case if system
* RAM is out of range for the currently configured page size and number
* of translation levels, in which case we will also need the extra
* level for the HYP ID map, or we won't be able to enable the EL2 MMU.
*
* However, at EL2, there is only one TTBR register, and we can't switch
* between translation tables *and* update TCR_EL2.T0SZ at the same
* time. Bottom line: we need the extra level in *both* our translation
* tables.
*
* So use the same T0SZ value we use for the ID map.
*/
ldr_l x5, idmap_t0sz
bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
#endif
msr tcr_el2, x4
ldr x4, =VTCR_EL2_FLAGS
@ -91,6 +111,10 @@ __do_hyp_init:
msr sctlr_el2, x4
isb
/* Skip the trampoline dance if we merged the boot and runtime PGDs */
cmp x0, x1
b.eq merged
/* MMU is now enabled. Get ready for the trampoline dance */
ldr x4, =TRAMPOLINE_VA
adr x5, target
@ -105,6 +129,7 @@ target: /* We're now in the trampoline code, switch page tables */
tlbi alle2
dsb sy
merged:
/* Set the stack and new vectors */
kern_hyp_va x2
mov sp, x2

12
arch/arm64/mm/mmu.c
View File

@ -40,6 +40,8 @@
#include "mm.h"
u64 idmap_t0sz = TCR_T0SZ(VA_BITS);
/*
* Empty_zero_page is a special page that is used for zero-initialized data
* and COW.
@ -454,6 +456,7 @@ void __init paging_init(void)
*/
cpu_set_reserved_ttbr0();
flush_tlb_all();
cpu_set_default_tcr_t0sz();
}
/*
@ -461,8 +464,10 @@ void __init paging_init(void)
*/
void setup_mm_for_reboot(void)
{
cpu_switch_mm(idmap_pg_dir, &init_mm);
cpu_set_reserved_ttbr0();
flush_tlb_all();
cpu_set_idmap_tcr_t0sz();
cpu_switch_mm(idmap_pg_dir, &init_mm);
}
/*
@ -627,10 +632,7 @@ void __set_fixmap(enum fixed_addresses idx,
unsigned long addr = __fix_to_virt(idx);
pte_t *pte;
if (idx >= __end_of_fixed_addresses) {
BUG();
return;
}
BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
pte = fixmap_pte(addr);

2
arch/arm64/mm/pageattr.c
View File

@ -73,7 +73,6 @@ int set_memory_ro(unsigned long addr, int numpages)
__pgprot(PTE_RDONLY),
__pgprot(PTE_WRITE));
}
EXPORT_SYMBOL_GPL(set_memory_ro);
int set_memory_rw(unsigned long addr, int numpages)
{
@ -81,7 +80,6 @@ int set_memory_rw(unsigned long addr, int numpages)
__pgprot(PTE_WRITE),
__pgprot(PTE_RDONLY));
}
EXPORT_SYMBOL_GPL(set_memory_rw);
int set_memory_nx(unsigned long addr, int numpages)
{

10
arch/arm64/mm/proc-macros.S
View File

@ -52,3 +52,13 @@
mov \reg, #4 // bytes per word
lsl \reg, \reg, \tmp // actual cache line size
.endm
/*
* tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
*/
.macro tcr_set_idmap_t0sz, valreg, tmpreg
#ifndef CONFIG_ARM64_VA_BITS_48
ldr_l \tmpreg, idmap_t0sz
bfi \valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
#endif
.endm

3
arch/arm64/mm/proc.S
View File

@ -156,6 +156,7 @@ ENTRY(cpu_do_resume)
msr cpacr_el1, x6
msr ttbr0_el1, x1
msr ttbr1_el1, x7
tcr_set_idmap_t0sz x8, x7
msr tcr_el1, x8
msr vbar_el1, x9
msr mdscr_el1, x10
@ -233,6 +234,8 @@ ENTRY(__cpu_setup)
*/
ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
TCR_TG_FLAGS | TCR_ASID16 | TCR_TBI0
tcr_set_idmap_t0sz x10, x9
/*
* Read the PARange bits from ID_AA64MMFR0_EL1 and set the IPS bits in
* TCR_EL1.