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-rw-r--r--arch/arm/mm/mmu.c302
1 files changed, 133 insertions, 169 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 285894171186..72ad3e1f56cf 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -11,13 +11,12 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
-#include <linux/sort.h>
+#include <linux/memblock.h>
+#include <linux/fs.h>
#include <asm/cputype.h>
-#include <asm/mach-types.h>
#include <asm/sections.h>
#include <asm/cachetype.h>
#include <asm/setup.h>
@@ -247,6 +246,9 @@ static struct mem_type mem_types[] = {
.domain = DOMAIN_USER,
},
[MT_MEMORY] = {
+ .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+ L_PTE_WRITE | L_PTE_EXEC,
+ .prot_l1 = PMD_TYPE_TABLE,
.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
.domain = DOMAIN_KERNEL,
},
@@ -255,9 +257,25 @@ static struct mem_type mem_types[] = {
.domain = DOMAIN_KERNEL,
},
[MT_MEMORY_NONCACHED] = {
+ .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+ L_PTE_WRITE | L_PTE_EXEC | L_PTE_MT_BUFFERABLE,
+ .prot_l1 = PMD_TYPE_TABLE,
.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_WRITE | L_PTE_EXEC,
+ .prot_l1 = PMD_TYPE_TABLE,
+ .domain = DOMAIN_KERNEL,
+ },
};
const struct mem_type *get_mem_type(unsigned int type)
@@ -291,9 +309,8 @@ static void __init build_mem_type_table(void)
cachepolicy = CPOLICY_WRITEBACK;
ecc_mask = 0;
}
-#ifdef CONFIG_SMP
- cachepolicy = CPOLICY_WRITEALLOC;
-#endif
+ if (is_smp())
+ cachepolicy = CPOLICY_WRITEALLOC;
/*
* Strip out features not present on earlier architectures.
@@ -387,21 +404,22 @@ static void __init build_mem_type_table(void)
cp = &cache_policies[cachepolicy];
vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
-#ifndef CONFIG_SMP
/*
* Only use write-through for non-SMP systems
*/
- if (cpu_arch >= CPU_ARCH_ARMv5 && cachepolicy > CPOLICY_WRITETHROUGH)
+ if (!is_smp() && cpu_arch >= CPU_ARCH_ARMv5 && cachepolicy > CPOLICY_WRITETHROUGH)
vecs_pgprot = cache_policies[CPOLICY_WRITETHROUGH].pte;
-#endif
/*
* Enable CPU-specific coherency if supported.
* (Only available on XSC3 at the moment.)
*/
- if (arch_is_coherent() && cpu_is_xsc3())
+ if (arch_is_coherent() && cpu_is_xsc3()) {
mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
-
+ mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
+ mem_types[MT_MEMORY_NONCACHED].prot_pte |= L_PTE_SHARED;
+ }
/*
* ARMv6 and above have extended page tables.
*/
@@ -414,20 +432,23 @@ static void __init build_mem_type_table(void)
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;
-#ifdef CONFIG_SMP
- /*
- * Mark memory with the "shared" attribute for SMP systems
- */
- user_pgprot |= L_PTE_SHARED;
- kern_pgprot |= L_PTE_SHARED;
- vecs_pgprot |= L_PTE_SHARED;
- mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_S;
- mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_SHARED;
- mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_S;
- mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED;
- mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
- mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
-#endif
+ if (is_smp()) {
+ /*
+ * Mark memory with the "shared" attribute
+ * for SMP systems
+ */
+ user_pgprot |= L_PTE_SHARED;
+ kern_pgprot |= L_PTE_SHARED;
+ vecs_pgprot |= L_PTE_SHARED;
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_S;
+ mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_SHARED;
+ mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_S;
+ mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED;
+ mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
+ mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
+ mem_types[MT_MEMORY_NONCACHED].prot_pte |= L_PTE_SHARED;
+ }
}
/*
@@ -463,6 +484,8 @@ static void __init build_mem_type_table(void)
mem_types[MT_LOW_VECTORS].prot_l1 |= ecc_mask;
mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask;
mem_types[MT_MEMORY].prot_sect |= ecc_mask | cp->pmd;
+ mem_types[MT_MEMORY].prot_pte |= kern_pgprot;
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |= ecc_mask;
mem_types[MT_ROM].prot_sect |= cp->pmd;
switch (cp->pmd) {
@@ -486,20 +509,43 @@ static void __init build_mem_type_table(void)
}
}
+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+ if (!pfn_valid(pfn))
+ return pgprot_noncached(vma_prot);
+ else if (file->f_flags & O_SYNC)
+ return pgprot_writecombine(vma_prot);
+ return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);
+#endif
+
#define vectors_base() (vectors_high() ? 0xffff0000 : 0)
-static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
- unsigned long end, unsigned long pfn,
- const struct mem_type *type)
+static void __init *early_alloc(unsigned long sz)
{
- pte_t *pte;
+ void *ptr = __va(memblock_alloc(sz, sz));
+ memset(ptr, 0, sz);
+ return ptr;
+}
+static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot)
+{
if (pmd_none(*pmd)) {
- pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
- __pmd_populate(pmd, __pa(pte) | type->prot_l1);
+ pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t));
+ __pmd_populate(pmd, __pa(pte) | prot);
}
+ BUG_ON(pmd_bad(*pmd));
+ return pte_offset_kernel(pmd, addr);
+}
- pte = pte_offset_kernel(pmd, addr);
+static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
+ unsigned long end, unsigned long pfn,
+ const struct mem_type *type)
+{
+ pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1);
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
pfn++;
@@ -668,7 +714,7 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
create_mapping(io_desc + i);
}
-static unsigned long __initdata vmalloc_reserve = SZ_128M;
+static void * __initdata vmalloc_min = (void *)(VMALLOC_END - SZ_128M);
/*
* vmalloc=size forces the vmalloc area to be exactly 'size'
@@ -677,7 +723,7 @@ static unsigned long __initdata vmalloc_reserve = SZ_128M;
*/
static int __init early_vmalloc(char *arg)
{
- vmalloc_reserve = memparse(arg, NULL);
+ unsigned long vmalloc_reserve = memparse(arg, NULL);
if (vmalloc_reserve < SZ_16M) {
vmalloc_reserve = SZ_16M;
@@ -692,22 +738,27 @@ static int __init early_vmalloc(char *arg)
"vmalloc area is too big, limiting to %luMB\n",
vmalloc_reserve >> 20);
}
+
+ vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve);
return 0;
}
early_param("vmalloc", early_vmalloc);
-#define VMALLOC_MIN (void *)(VMALLOC_END - vmalloc_reserve)
+static phys_addr_t lowmem_limit __initdata = 0;
static void __init sanity_check_meminfo(void)
{
int i, j, highmem = 0;
+ lowmem_limit = __pa(vmalloc_min - 1) + 1;
+ memblock_set_current_limit(lowmem_limit);
+
for (i = 0, j = 0; i < meminfo.nr_banks; i++) {
struct membank *bank = &meminfo.bank[j];
*bank = meminfo.bank[i];
#ifdef CONFIG_HIGHMEM
- if (__va(bank->start) > VMALLOC_MIN ||
+ if (__va(bank->start) > vmalloc_min ||
__va(bank->start) < (void *)PAGE_OFFSET)
highmem = 1;
@@ -717,8 +768,8 @@ static void __init sanity_check_meminfo(void)
* Split those memory banks which are partially overlapping
* the vmalloc area greatly simplifying things later.
*/
- if (__va(bank->start) < VMALLOC_MIN &&
- bank->size > VMALLOC_MIN - __va(bank->start)) {
+ if (__va(bank->start) < vmalloc_min &&
+ bank->size > vmalloc_min - __va(bank->start)) {
if (meminfo.nr_banks >= NR_BANKS) {
printk(KERN_CRIT "NR_BANKS too low, "
"ignoring high memory\n");
@@ -727,12 +778,12 @@ static void __init sanity_check_meminfo(void)
(meminfo.nr_banks - i) * sizeof(*bank));
meminfo.nr_banks++;
i++;
- bank[1].size -= VMALLOC_MIN - __va(bank->start);
- bank[1].start = __pa(VMALLOC_MIN - 1) + 1;
+ bank[1].size -= vmalloc_min - __va(bank->start);
+ bank[1].start = __pa(vmalloc_min - 1) + 1;
bank[1].highmem = highmem = 1;
j++;
}
- bank->size = VMALLOC_MIN - __va(bank->start);
+ bank->size = vmalloc_min - __va(bank->start);
}
#else
bank->highmem = highmem;
@@ -741,7 +792,7 @@ static void __init sanity_check_meminfo(void)
* Check whether this memory bank would entirely overlap
* the vmalloc area.
*/
- if (__va(bank->start) >= VMALLOC_MIN ||
+ if (__va(bank->start) >= vmalloc_min ||
__va(bank->start) < (void *)PAGE_OFFSET) {
printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
"(vmalloc region overlap).\n",
@@ -753,9 +804,9 @@ static void __init sanity_check_meminfo(void)
* Check whether this memory bank would partially overlap
* the vmalloc area.
*/
- if (__va(bank->start + bank->size) > VMALLOC_MIN ||
+ if (__va(bank->start + bank->size) > vmalloc_min ||
__va(bank->start + bank->size) < __va(bank->start)) {
- unsigned long newsize = VMALLOC_MIN - __va(bank->start);
+ unsigned long newsize = vmalloc_min - __va(bank->start);
printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx "
"to -%.8lx (vmalloc region overlap).\n",
bank->start, bank->start + bank->size - 1,
@@ -776,8 +827,7 @@ static void __init sanity_check_meminfo(void)
* rather difficult.
*/
reason = "with VIPT aliasing cache";
-#ifdef CONFIG_SMP
- } else if (tlb_ops_need_broadcast()) {
+ } else if (is_smp() && tlb_ops_need_broadcast()) {
/*
* kmap_high needs to occasionally flush TLB entries,
* however, if the TLB entries need to be broadcast
@@ -787,7 +837,6 @@ static void __init sanity_check_meminfo(void)
* (must not be called with irqs off)
*/
reason = "without hardware TLB ops broadcasting";
-#endif
}
if (reason) {
printk(KERN_CRIT "HIGHMEM is not supported %s, ignoring high memory\n",
@@ -803,6 +852,7 @@ static void __init sanity_check_meminfo(void)
static inline void prepare_page_table(void)
{
unsigned long addr;
+ phys_addr_t end;
/*
* Clear out all the mappings below the kernel image.
@@ -818,110 +868,39 @@ static inline void prepare_page_table(void)
pmd_clear(pmd_off_k(addr));
/*
+ * Find the end of the first block of lowmem.
+ */
+ end = memblock.memory.regions[0].base + memblock.memory.regions[0].size;
+ if (end >= lowmem_limit)
+ end = lowmem_limit;
+
+ /*
* Clear out all the kernel space mappings, except for the first
* memory bank, up to the end of the vmalloc region.
*/
- for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0]));
+ for (addr = __phys_to_virt(end);
addr < VMALLOC_END; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
}
/*
- * Reserve the various regions of node 0
+ * Reserve the special regions of memory
*/
-void __init reserve_node_zero(pg_data_t *pgdat)
+void __init arm_mm_memblock_reserve(void)
{
- unsigned long res_size = 0;
-
- /*
- * Register the kernel text and data with bootmem.
- * Note that this can only be in node 0.
- */
-#ifdef CONFIG_XIP_KERNEL
- reserve_bootmem_node(pgdat, __pa(_data), _end - _data,
- BOOTMEM_DEFAULT);
-#else
- reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext,
- BOOTMEM_DEFAULT);
-#endif
-
/*
* Reserve the page tables. These are already in use,
* and can only be in node 0.
*/
- reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
- PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT);
-
- /*
- * Hmm... This should go elsewhere, but we really really need to
- * stop things allocating the low memory; ideally we need a better
- * implementation of GFP_DMA which does not assume that DMA-able
- * memory starts at zero.
- */
- if (machine_is_integrator() || machine_is_cintegrator())
- res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
-
- /*
- * These should likewise go elsewhere. They pre-reserve the
- * screen memory region at the start of main system memory.
- */
- if (machine_is_edb7211())
- res_size = 0x00020000;
- if (machine_is_p720t())
- res_size = 0x00014000;
-
- /* H1940, RX3715 and RX1950 need to reserve this for suspend */
-
- if (machine_is_h1940() || machine_is_rx3715()
- || machine_is_rx1950()) {
- reserve_bootmem_node(pgdat, 0x30003000, 0x1000,
- BOOTMEM_DEFAULT);
- reserve_bootmem_node(pgdat, 0x30081000, 0x1000,
- BOOTMEM_DEFAULT);
- }
-
- if (machine_is_palmld() || machine_is_palmtx()) {
- reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
- BOOTMEM_EXCLUSIVE);
- reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
- BOOTMEM_EXCLUSIVE);
- }
-
- if (machine_is_treo680() || machine_is_centro()) {
- reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
- BOOTMEM_EXCLUSIVE);
- reserve_bootmem_node(pgdat, 0xa2000000, 0x1000,
- BOOTMEM_EXCLUSIVE);
- }
-
- if (machine_is_palmt5())
- reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
- BOOTMEM_EXCLUSIVE);
-
- /*
- * U300 - This platform family can share physical memory
- * between two ARM cpus, one running Linux and the other
- * running another OS.
- */
- if (machine_is_u300()) {
-#ifdef CONFIG_MACH_U300_SINGLE_RAM
-#if ((CONFIG_MACH_U300_ACCESS_MEM_SIZE & 1) == 1) && \
- CONFIG_MACH_U300_2MB_ALIGNMENT_FIX
- res_size = 0x00100000;
-#endif
-#endif
- }
+ memblock_reserve(__pa(swapper_pg_dir), PTRS_PER_PGD * sizeof(pgd_t));
#ifdef CONFIG_SA1111
/*
* Because of the SA1111 DMA bug, we want to preserve our
* precious DMA-able memory...
*/
- res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+ memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
#endif
- if (res_size)
- reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size,
- BOOTMEM_DEFAULT);
}
/*
@@ -940,7 +919,7 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
/*
* Allocate the vector page early.
*/
- vectors = alloc_bootmem_low_pages(PAGE_SIZE);
+ vectors = early_alloc(PAGE_SIZE);
for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
@@ -1011,45 +990,33 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
static void __init kmap_init(void)
{
#ifdef CONFIG_HIGHMEM
- pmd_t *pmd = pmd_off_k(PKMAP_BASE);
- pte_t *pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
- BUG_ON(!pmd_none(*pmd) || !pte);
- __pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE);
- pkmap_page_table = pte + PTRS_PER_PTE;
+ pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE),
+ PKMAP_BASE, _PAGE_KERNEL_TABLE);
#endif
}
-static inline void map_memory_bank(struct membank *bank)
-{
- struct map_desc map;
-
- map.pfn = bank_pfn_start(bank);
- map.virtual = __phys_to_virt(bank_phys_start(bank));
- map.length = bank_phys_size(bank);
- map.type = MT_MEMORY;
-
- create_mapping(&map);
-}
-
static void __init map_lowmem(void)
{
- struct meminfo *mi = &meminfo;
- int i;
+ struct memblock_region *reg;
/* Map all the lowmem memory banks. */
- for (i = 0; i < mi->nr_banks; i++) {
- struct membank *bank = &mi->bank[i];
+ for_each_memblock(memory, reg) {
+ phys_addr_t start = reg->base;
+ phys_addr_t end = start + reg->size;
+ struct map_desc map;
+
+ if (end > lowmem_limit)
+ end = lowmem_limit;
+ if (start >= end)
+ break;
- if (!bank->highmem)
- map_memory_bank(bank);
- }
-}
+ map.pfn = __phys_to_pfn(start);
+ map.virtual = __phys_to_virt(start);
+ map.length = end - start;
+ map.type = MT_MEMORY;
-static int __init meminfo_cmp(const void *_a, const void *_b)
-{
- const struct membank *a = _a, *b = _b;
- long cmp = bank_pfn_start(a) - bank_pfn_start(b);
- return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
+ create_mapping(&map);
+ }
}
/*
@@ -1060,23 +1027,20 @@ void __init paging_init(struct machine_desc *mdesc)
{
void *zero_page;
- sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
-
build_mem_type_table();
sanity_check_meminfo();
prepare_page_table();
map_lowmem();
- bootmem_init();
devicemaps_init(mdesc);
kmap_init();
top_pmd = pmd_off_k(0xffff0000);
- /*
- * allocate the zero page. Note that this always succeeds and
- * returns a zeroed result.
- */
- zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
+ /* allocate the zero page. */
+ zero_page = early_alloc(PAGE_SIZE);
+
+ bootmem_init();
+
empty_zero_page = virt_to_page(zero_page);
__flush_dcache_page(NULL, empty_zero_page);
}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-18 14:47:45 +0200