ARM: LPAE: MMU setup for the 3-level page table format (1b6ba46b) · Commits · 戴 / test

arch/arm/kernel/head.S

+43 −2

Original line number	Diff line number	Diff line
		@@ -39,8 +39,14 @@
		#error KERNEL_RAM_VADDR must start at 0xXXXX8000
		#endif

		#ifdef CONFIG_ARM_LPAE
		/* LPAE requires an additional page for the PGD */
		#define PG_DIR_SIZE 0x5000
		#define PMD_ORDER 3
		#else
		#define PG_DIR_SIZE 0x4000
		#define PMD_ORDER 2
		#endif

		.globl swapper_pg_dir
		.equ swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE
		@@ -164,6 +170,25 @@ __create_page_tables:
		teq r0, r6
		bne 1b

		#ifdef CONFIG_ARM_LPAE
		/*
		* Build the PGD table (first level) to point to the PMD table. A PGD
		* entry is 64-bit wide.
		*/
		mov r0, r4
		add r3, r4, #0x1000 @ first PMD table address
		orr r3, r3, #3 @ PGD block type
		mov r6, #4 @ PTRS_PER_PGD
		mov r7, #1 << (55 - 32) @ L_PGD_SWAPPER
		1: str r3, [r0], #4 @ set bottom PGD entry bits
		str r7, [r0], #4 @ set top PGD entry bits
		add r3, r3, #0x1000 @ next PMD table
		subs r6, r6, #1
		bne 1b

		add r4, r4, #0x1000 @ point to the PMD tables
		#endif

		ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags

		/*
		@@ -219,8 +244,8 @@ __create_page_tables:
		#endif

		/*
		* Then map boot params address in r2 or
		* the first 1MB of ram if boot params address is not specified.
		* Then map boot params address in r2 or the first 1MB (2MB with LPAE)
		* of ram if boot params address is not specified.
		*/
		mov r0, r2, lsr #SECTION_SHIFT
		movs r0, r0, lsl #SECTION_SHIFT
		@@ -251,7 +276,15 @@ __create_page_tables:
		mov r3, r7, lsr #SECTION_SHIFT
		ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
		orr r3, r7, r3, lsl #SECTION_SHIFT
		#ifdef CONFIG_ARM_LPAE
		mov r7, #1 << (54 - 32) @ XN
		#else
		orr r3, r3, #PMD_SECT_XN
		#endif
		1: str r3, [r0], #4
		#ifdef CONFIG_ARM_LPAE
		str r7, [r0], #4
		#endif
		add r3, r3, #1 << SECTION_SHIFT
		cmp r0, r6
		blo 1b
		@@ -282,6 +315,9 @@ __create_page_tables:
		add r0, r4, #0xd8000000 >> (SECTION_SHIFT - PMD_ORDER)
		str r3, [r0]
		#endif
		#endif
		#ifdef CONFIG_ARM_LPAE
		sub r4, r4, #0x1000 @ point to the PGD table
		#endif
		mov pc, lr
		ENDPROC(__create_page_tables)
		@@ -374,12 +410,17 @@ __enable_mmu:
		#ifdef CONFIG_CPU_ICACHE_DISABLE
		bic r0, r0, #CR_I
		#endif
		#ifdef CONFIG_ARM_LPAE
		mov r5, #0
		mcrr p15, 0, r4, r5, c2 @ load TTBR0
		#else
		mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) \| \
		domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) \| \
		domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) \| \
		domain_val(DOMAIN_IO, DOMAIN_CLIENT))
		mcr p15, 0, r5, c3, c0, 0 @ load domain access register
		mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
		#endif
		b __turn_mmu_on
		ENDPROC(__enable_mmu)

arch/arm/mm/mmu.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -150,6 +150,7 @@ static int __init early_nowrite(char *__unused)
		}
		early_param("nowb", early_nowrite);

		#ifndef CONFIG_ARM_LPAE
		static int __init early_ecc(char *p)
		{
		if (memcmp(p, "on", 2) == 0)
		@@ -159,6 +160,7 @@ static int __init early_ecc(char *p)
		return 0;
		}
		early_param("ecc", early_ecc);
		#endif

		static int __init noalign_setup(char *__unused)
		{
		@@ -228,10 +230,12 @@ static struct mem_type mem_types[] = {
		.prot_sect = PMD_TYPE_SECT \| PMD_SECT_XN,
		.domain = DOMAIN_KERNEL,
		},
		#ifndef CONFIG_ARM_LPAE
		[MT_MINICLEAN] = {
		.prot_sect = PMD_TYPE_SECT \| PMD_SECT_XN \| PMD_SECT_MINICACHE,
		.domain = DOMAIN_KERNEL,
		},
		#endif
		[MT_LOW_VECTORS] = {
		.prot_pte = L_PTE_PRESENT \| L_PTE_YOUNG \| L_PTE_DIRTY \|
		L_PTE_RDONLY,
		@@ -429,6 +433,7 @@ static void __init build_mem_type_table(void)
		* ARMv6 and above have extended page tables.
		*/
		if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
		#ifndef CONFIG_ARM_LPAE
		/*
		* Mark cache clean areas and XIP ROM read only
		* from SVC mode and no access from userspace.
		@@ -436,6 +441,7 @@ static void __init build_mem_type_table(void)
		mem_types[MT_ROM].prot_sect \|= PMD_SECT_APX\|PMD_SECT_AP_WRITE;
		mem_types[MT_MINICLEAN].prot_sect \|= PMD_SECT_APX\|PMD_SECT_AP_WRITE;
		mem_types[MT_CACHECLEAN].prot_sect \|= PMD_SECT_APX\|PMD_SECT_AP_WRITE;
		#endif

		if (is_smp()) {
		/*
		@@ -474,6 +480,18 @@ static void __init build_mem_type_table(void)
		mem_types[MT_MEMORY_NONCACHED].prot_sect \|= PMD_SECT_BUFFERABLE;
		}

		#ifdef CONFIG_ARM_LPAE
		/*
		* Do not generate access flag faults for the kernel mappings.
		*/
		for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
		mem_types[i].prot_pte \|= PTE_EXT_AF;
		mem_types[i].prot_sect \|= PMD_SECT_AF;
		}
		kern_pgprot \|= PTE_EXT_AF;
		vecs_pgprot \|= PTE_EXT_AF;
		#endif

		for (i = 0; i < 16; i++) {
		unsigned long v = pgprot_val(protection_map[i]);
		protection_map[i] = __pgprot(v \| user_pgprot);
		@@ -572,8 +590,10 @@ static void __init alloc_init_section(pud_t *pud, unsigned long addr,
		if (((addr \| end \| phys) & ~SECTION_MASK) == 0) {
		pmd_t *p = pmd;

		#ifndef CONFIG_ARM_LPAE
		if (addr & SECTION_SIZE)
		pmd++;
		#endif

		do {
		*pmd = __pmd(phys \| type->prot_sect);
		@@ -603,6 +623,7 @@ static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
		} while (pud++, addr = next, addr != end);
		}

		#ifndef CONFIG_ARM_LPAE
		static void __init create_36bit_mapping(struct map_desc *md,
		const struct mem_type *type)
		{
		@@ -662,6 +683,7 @@ static void __init create_36bit_mapping(struct map_desc *md,
		pgd += SUPERSECTION_SIZE >> PGDIR_SHIFT;
		} while (addr != end);
		}
		#endif /* !CONFIG_ARM_LPAE */

		/*
		* Create the page directory entries and any necessary
		@@ -693,6 +715,7 @@ static void __init create_mapping(struct map_desc *md)

		type = &mem_types[md->type];

		#ifndef CONFIG_ARM_LPAE
		/*
		* Catch 36-bit addresses
		*/
		@@ -700,6 +723,7 @@ static void __init create_mapping(struct map_desc *md)
		create_36bit_mapping(md, type);
		return;
		}
		#endif

		addr = md->virtual & PAGE_MASK;
		phys = __pfn_to_phys(md->pfn);
		@@ -897,7 +921,13 @@ static inline void prepare_page_table(void)
		pmd_clear(pmd_off_k(addr));
		}

		#ifdef CONFIG_ARM_LPAE
		/* the first page is reserved for pgd */
		#define SWAPPER_PG_DIR_SIZE (PAGE_SIZE + \
		PTRS_PER_PGD * PTRS_PER_PMD * sizeof(pmd_t))
		#else
		#define SWAPPER_PG_DIR_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
		#endif

		/*
		* Reserve the special regions of memory

arch/arm/mm/proc-macros.S

+3 −2

Original line number	Diff line number	Diff line
		@@ -91,7 +91,8 @@
		#if L_PTE_SHARED != PTE_EXT_SHARED
		#error PTE shared bit mismatch
		#endif
		#if (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
		#if !defined (CONFIG_ARM_LPAE) && \
		(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
		L_PTE_FILE+L_PTE_PRESENT) > L_PTE_SHARED
		#error Invalid Linux PTE bit settings
		#endif

arch/arm/mm/proc-v7-3level.S

0 → 100644

+150 −0

Original line number	Diff line number	Diff line
		/*
		* arch/arm/mm/proc-v7-3level.S
		*
		* Copyright (C) 2001 Deep Blue Solutions Ltd.
		* Copyright (C) 2011 ARM Ltd.
		* Author: Catalin Marinas <catalin.marinas@arm.com>
		* based on arch/arm/mm/proc-v7-2level.S
		*
		* 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, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#define TTB_IRGN_NC (0 << 8)
		#define TTB_IRGN_WBWA (1 << 8)
		#define TTB_IRGN_WT (2 << 8)
		#define TTB_IRGN_WB (3 << 8)
		#define TTB_RGN_NC (0 << 10)
		#define TTB_RGN_OC_WBWA (1 << 10)
		#define TTB_RGN_OC_WT (2 << 10)
		#define TTB_RGN_OC_WB (3 << 10)
		#define TTB_S (3 << 12)
		#define TTB_EAE (1 << 31)

		/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
		#define TTB_FLAGS_UP (TTB_IRGN_WB\|TTB_RGN_OC_WB)
		#define PMD_FLAGS_UP (PMD_SECT_WB)

		/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
		#define TTB_FLAGS_SMP (TTB_IRGN_WBWA\|TTB_S\|TTB_RGN_OC_WBWA)
		#define PMD_FLAGS_SMP (PMD_SECT_WBWA\|PMD_SECT_S)

		/*
		* cpu_v7_switch_mm(pgd_phys, tsk)
		*
		* Set the translation table base pointer to be pgd_phys (physical address of
		* the new TTB).
		*/
		ENTRY(cpu_v7_switch_mm)
		#ifdef CONFIG_MMU
		ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
		and r3, r1, #0xff
		mov r3, r3, lsl #(48 - 32) @ ASID
		mcrr p15, 0, r0, r3, c2 @ set TTB 0
		isb
		#endif
		mov pc, lr
		ENDPROC(cpu_v7_switch_mm)

		/*
		* cpu_v7_set_pte_ext(ptep, pte)
		*
		* Set a level 2 translation table entry.
		* - ptep - pointer to level 3 translation table entry
		* - pte - PTE value to store (64-bit in r2 and r3)
		*/
		ENTRY(cpu_v7_set_pte_ext)
		#ifdef CONFIG_MMU
		tst r2, #L_PTE_PRESENT
		beq 1f
		tst r3, #1 << (55 - 32) @ L_PTE_DIRTY
		orreq r2, #L_PTE_RDONLY
		1: strd r2, r3, [r0]
		mcr p15, 0, r0, c7, c10, 1 @ flush_pte
		#endif
		mov pc, lr
		ENDPROC(cpu_v7_set_pte_ext)

		/*
		* Memory region attributes for LPAE (defined in pgtable-3level.h):
		*
		* n = AttrIndx[2:0]
		*
		* n MAIR
		* UNCACHED 000 00000000
		* BUFFERABLE 001 01000100
		* DEV_WC 001 01000100
		* WRITETHROUGH 010 10101010
		* WRITEBACK 011 11101110
		* DEV_CACHED 011 11101110
		* DEV_SHARED 100 00000100
		* DEV_NONSHARED 100 00000100
		* unused 101
		* unused 110
		* WRITEALLOC 111 11111111
		*/
		.equ PRRR, 0xeeaa4400 @ MAIR0
		.equ NMRR, 0xff000004 @ MAIR1

		/*
		* Macro for setting up the TTBRx and TTBCR registers.
		* - \ttbr1 updated.
		*/
		.macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp
		ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address
		cmp \ttbr1, \tmp @ PHYS_OFFSET > PAGE_OFFSET? (branch below)
		mrc p15, 0, \tmp, c2, c0, 2 @ TTB control register
		orr \tmp, \tmp, #TTB_EAE
		ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP)
		ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP)
		ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16)
		ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16)
		/*
		* TTBR0/TTBR1 split (PAGE_OFFSET):
		* 0x40000000: T0SZ = 2, T1SZ = 0 (not used)
		* 0x80000000: T0SZ = 0, T1SZ = 1
		* 0xc0000000: T0SZ = 0, T1SZ = 2
		*
		* Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise
		* booting secondary CPUs would end up using TTBR1 for the identity
		* mapping set up in TTBR0.
		*/
		bhi 9001f @ PHYS_OFFSET > PAGE_OFFSET?
		orr \tmp, \tmp, #(((PAGE_OFFSET >> 30) - 1) << 16) @ TTBCR.T1SZ
		#if defined CONFIG_VMSPLIT_2G
		/* PAGE_OFFSET == 0x80000000, T1SZ == 1 */
		add \ttbr1, \ttbr1, #1 << 4 @ skip two L1 entries
		#elif defined CONFIG_VMSPLIT_3G
		/* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */
		add \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip pgd+3*pmd
		#endif
		/* CONFIG_VMSPLIT_1G does not need TTBR1 adjustment */
		9001: mcr p15, 0, \tmp, c2, c0, 2 @ TTB control register
		mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1
		.endm

		__CPUINIT

		/*
		* AT
		* TFR EV X F IHD LR S
		* .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
		* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
		* 11 0 110 1 0011 1100 .111 1101 < we want
		*/
		.align 2
		.type v7_crval, #object
		v7_crval:
		crval clear=0x0120c302, mmuset=0x30c23c7d, ucset=0x00c01c7c

		.previous

arch/arm/mm/proc-v7.S

+17 −8

Original line number	Diff line number	Diff line
		@@ -19,7 +19,11 @@

		#include "proc-macros.S"

		#ifdef CONFIG_ARM_LPAE
		#include "proc-v7-3level.S"
		#else
		#include "proc-v7-2level.S"
		#endif

		ENTRY(cpu_v7_proc_init)
		mov pc, lr
		@@ -87,7 +91,7 @@ ENDPROC(cpu_v7_dcache_clean_area)

		/* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
		.globl cpu_v7_suspend_size
		.equ cpu_v7_suspend_size, 4 * 7
		.equ cpu_v7_suspend_size, 4 * 8
		#ifdef CONFIG_ARM_CPU_SUSPEND
		ENTRY(cpu_v7_do_suspend)
		stmfd sp!, {r4 - r10, lr}
		@@ -96,10 +100,11 @@ ENTRY(cpu_v7_do_suspend)
		stmia r0!, {r4 - r5}
		mrc p15, 0, r6, c3, c0, 0 @ Domain ID
		mrc p15, 0, r7, c2, c0, 1 @ TTB 1
		mrc p15, 0, r11, c2, c0, 2 @ TTB control register
		mrc p15, 0, r8, c1, c0, 0 @ Control register
		mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register
		mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control
		stmia r0, {r6 - r10}
		stmia r0, {r6 - r11}
		ldmfd sp!, {r4 - r10, pc}
		ENDPROC(cpu_v7_do_suspend)

		@@ -111,13 +116,15 @@ ENTRY(cpu_v7_do_resume)
		ldmia r0!, {r4 - r5}
		mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
		mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID
		ldmia r0, {r6 - r10}
		ldmia r0, {r6 - r11}
		mcr p15, 0, r6, c3, c0, 0 @ Domain ID
		#ifndef CONFIG_ARM_LPAE
		ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP)
		ALT_UP(orr r1, r1, #TTB_FLAGS_UP)
		#endif
		mcr p15, 0, r1, c2, c0, 0 @ TTB 0
		mcr p15, 0, r7, c2, c0, 1 @ TTB 1
		mcr p15, 0, ip, c2, c0, 2 @ TTB control register
		mcr p15, 0, r11, c2, c0, 2 @ TTB control register
		mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register
		teq r4, r9 @ Is it already set?
		mcrne p15, 0, r9, c1, c0, 1 @ No, so write it
		@@ -291,11 +298,11 @@ __v7_setup_stack:
		*/
		.macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
		ALT_SMP(.long PMD_TYPE_SECT \| PMD_SECT_AP_WRITE \| PMD_SECT_AP_READ \| \
		PMD_FLAGS_SMP \| \mm_mmuflags)
		PMD_SECT_AF \| PMD_FLAGS_SMP \| \mm_mmuflags)
		ALT_UP(.long PMD_TYPE_SECT \| PMD_SECT_AP_WRITE \| PMD_SECT_AP_READ \| \
		PMD_FLAGS_UP \| \mm_mmuflags)
		.long PMD_TYPE_SECT \| PMD_SECT_XN \| PMD_SECT_AP_WRITE \| \
		PMD_SECT_AP_READ \| \io_mmuflags
		PMD_SECT_AF \| PMD_FLAGS_UP \| \mm_mmuflags)
		.long PMD_TYPE_SECT \| PMD_SECT_AP_WRITE \| \
		PMD_SECT_AP_READ \| PMD_SECT_AF \| \io_mmuflags
		W(b) \initfunc
		.long cpu_arch_name
		.long cpu_elf_name
		@@ -308,6 +315,7 @@ __v7_setup_stack:
		.long v7_cache_fns
		.endm

		#ifndef CONFIG_ARM_LPAE
		/*
		* ARM Ltd. Cortex A5 processor.
		*/
		@@ -327,6 +335,7 @@ __v7_ca9mp_proc_info:
		.long 0xff0ffff0
		__v7_proc __v7_ca9mp_setup
		.size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
		#endif /* CONFIG_ARM_LPAE */

		/*
		* ARM Ltd. Cortex A15 processor.

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