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Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c119
1 files changed, 56 insertions, 63 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e8ed9dc461fe..72ad3e1f56cf 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -14,7 +14,6 @@
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/memblock.h>
-#include <linux/sort.h>
#include <linux/fs.h>
#include <asm/cputype.h>
@@ -265,17 +264,17 @@ static struct mem_type mem_types[] = {
.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,
+ .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+ L_PTE_WRITE,
+ .prot_l1 = PMD_TYPE_TABLE,
+ .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
+ .domain = DOMAIN_KERNEL,
},
[MT_MEMORY_ITCM] = {
.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
- L_PTE_USER | L_PTE_EXEC,
+ L_PTE_WRITE | L_PTE_EXEC,
.prot_l1 = PMD_TYPE_TABLE,
- .domain = DOMAIN_IO,
+ .domain = DOMAIN_KERNEL,
},
};
@@ -310,9 +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.
@@ -406,13 +404,11 @@ 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.
@@ -436,22 +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].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;
-#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;
+ }
}
/*
@@ -747,13 +744,14 @@ static int __init early_vmalloc(char *arg)
}
early_param("vmalloc", early_vmalloc);
-phys_addr_t lowmem_end_addr;
+static phys_addr_t lowmem_limit __initdata = 0;
static void __init sanity_check_meminfo(void)
{
int i, j, highmem = 0;
- lowmem_end_addr = __pa(vmalloc_min - 1) + 1;
+ 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];
@@ -829,8 +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
@@ -840,7 +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",
@@ -856,6 +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.
@@ -871,10 +868,17 @@ 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));
}
@@ -991,37 +995,28 @@ static void __init kmap_init(void)
#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);
+ }
}
/*
@@ -1032,8 +1027,6 @@ 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();
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.