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[ARM] Move rest of MMU setup code from mm-armv.c to mmu.c
If we're going to have mmu.c for code which is specific to the MMU machines, we might as well move the other MMU initialisation specific code from mm-armv.c into this new file. This also allows us to make some functions static. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
Russell King
parent
d111e8f964
commit
ae8f154129
@ -9,137 +9,15 @@
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*
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* Page table sludge for ARM v3 and v4 processor architectures.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/nodemask.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#include <asm/tlbflush.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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#define CPOLICY_UNCACHED 0
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#define CPOLICY_BUFFERED 1
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#define CPOLICY_WRITETHROUGH 2
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#define CPOLICY_WRITEBACK 3
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#define CPOLICY_WRITEALLOC 4
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static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK;
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static unsigned int ecc_mask __initdata = 0;
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pgprot_t pgprot_kernel;
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EXPORT_SYMBOL(pgprot_kernel);
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struct cachepolicy {
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const char policy[16];
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unsigned int cr_mask;
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unsigned int pmd;
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unsigned int pte;
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};
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static struct cachepolicy cache_policies[] __initdata = {
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{
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.policy = "uncached",
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.cr_mask = CR_W|CR_C,
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.pmd = PMD_SECT_UNCACHED,
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.pte = 0,
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}, {
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.policy = "buffered",
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.cr_mask = CR_C,
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.pmd = PMD_SECT_BUFFERED,
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.pte = PTE_BUFFERABLE,
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}, {
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.policy = "writethrough",
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.cr_mask = 0,
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.pmd = PMD_SECT_WT,
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.pte = PTE_CACHEABLE,
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}, {
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.policy = "writeback",
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.cr_mask = 0,
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.pmd = PMD_SECT_WB,
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.pte = PTE_BUFFERABLE|PTE_CACHEABLE,
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}, {
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.policy = "writealloc",
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.cr_mask = 0,
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.pmd = PMD_SECT_WBWA,
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.pte = PTE_BUFFERABLE|PTE_CACHEABLE,
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}
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};
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/*
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* These are useful for identifing cache coherency
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* problems by allowing the cache or the cache and
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* writebuffer to be turned off. (Note: the write
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* buffer should not be on and the cache off).
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*/
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static void __init early_cachepolicy(char **p)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
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int len = strlen(cache_policies[i].policy);
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if (memcmp(*p, cache_policies[i].policy, len) == 0) {
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cachepolicy = i;
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cr_alignment &= ~cache_policies[i].cr_mask;
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cr_no_alignment &= ~cache_policies[i].cr_mask;
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*p += len;
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break;
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}
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}
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if (i == ARRAY_SIZE(cache_policies))
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printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n");
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flush_cache_all();
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set_cr(cr_alignment);
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}
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static void __init early_nocache(char **__unused)
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{
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char *p = "buffered";
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printk(KERN_WARNING "nocache is deprecated; use cachepolicy=%s\n", p);
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early_cachepolicy(&p);
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}
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static void __init early_nowrite(char **__unused)
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{
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char *p = "uncached";
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printk(KERN_WARNING "nowb is deprecated; use cachepolicy=%s\n", p);
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early_cachepolicy(&p);
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}
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static void __init early_ecc(char **p)
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{
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if (memcmp(*p, "on", 2) == 0) {
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ecc_mask = PMD_PROTECTION;
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*p += 2;
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} else if (memcmp(*p, "off", 3) == 0) {
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ecc_mask = 0;
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*p += 3;
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}
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}
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__early_param("nocache", early_nocache);
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__early_param("nowb", early_nowrite);
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__early_param("cachepolicy=", early_cachepolicy);
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__early_param("ecc=", early_ecc);
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static int __init noalign_setup(char *__unused)
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{
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cr_alignment &= ~CR_A;
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cr_no_alignment &= ~CR_A;
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set_cr(cr_alignment);
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return 1;
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}
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__setup("noalign", noalign_setup);
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#define FIRST_KERNEL_PGD_NR (FIRST_USER_PGD_NR + USER_PTRS_PER_PGD)
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/*
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@ -223,431 +101,3 @@ void free_pgd_slow(pgd_t *pgd)
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free:
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free_pages((unsigned long) pgd, 2);
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}
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/*
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* Create a SECTION PGD between VIRT and PHYS in domain
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* DOMAIN with protection PROT. This operates on half-
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* pgdir entry increments.
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*/
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static inline void
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alloc_init_section(unsigned long virt, unsigned long phys, int prot)
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{
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pmd_t *pmdp = pmd_off_k(virt);
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if (virt & (1 << 20))
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pmdp++;
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*pmdp = __pmd(phys | prot);
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flush_pmd_entry(pmdp);
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}
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/*
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* Create a SUPER SECTION PGD between VIRT and PHYS with protection PROT
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*/
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static inline void
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alloc_init_supersection(unsigned long virt, unsigned long phys, int prot)
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{
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int i;
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for (i = 0; i < 16; i += 1) {
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alloc_init_section(virt, phys, prot | PMD_SECT_SUPER);
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virt += (PGDIR_SIZE / 2);
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}
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}
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/*
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* Add a PAGE mapping between VIRT and PHYS in domain
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* DOMAIN with protection PROT. Note that due to the
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* way we map the PTEs, we must allocate two PTE_SIZE'd
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* blocks - one for the Linux pte table, and one for
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* the hardware pte table.
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*/
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static inline void
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alloc_init_page(unsigned long virt, unsigned long phys, unsigned int prot_l1, pgprot_t prot)
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{
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pmd_t *pmdp = pmd_off_k(virt);
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pte_t *ptep;
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if (pmd_none(*pmdp)) {
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ptep = alloc_bootmem_low_pages(2 * PTRS_PER_PTE *
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sizeof(pte_t));
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__pmd_populate(pmdp, __pa(ptep) | prot_l1);
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}
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ptep = pte_offset_kernel(pmdp, virt);
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set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
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}
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struct mem_types {
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unsigned int prot_pte;
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unsigned int prot_l1;
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unsigned int prot_sect;
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unsigned int domain;
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};
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static struct mem_types mem_types[] __initdata = {
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[MT_DEVICE] = {
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.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
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L_PTE_WRITE,
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.prot_l1 = PMD_TYPE_TABLE,
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED |
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PMD_SECT_AP_WRITE,
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.domain = DOMAIN_IO,
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},
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[MT_CACHECLEAN] = {
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
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.domain = DOMAIN_KERNEL,
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},
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[MT_MINICLEAN] = {
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_MINICACHE,
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.domain = DOMAIN_KERNEL,
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},
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[MT_LOW_VECTORS] = {
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.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
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L_PTE_EXEC,
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.prot_l1 = PMD_TYPE_TABLE,
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.domain = DOMAIN_USER,
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},
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[MT_HIGH_VECTORS] = {
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.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
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L_PTE_USER | L_PTE_EXEC,
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.prot_l1 = PMD_TYPE_TABLE,
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.domain = DOMAIN_USER,
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},
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[MT_MEMORY] = {
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_AP_WRITE,
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.domain = DOMAIN_KERNEL,
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},
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[MT_ROM] = {
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
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.domain = DOMAIN_KERNEL,
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},
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[MT_IXP2000_DEVICE] = { /* IXP2400 requires XCB=101 for on-chip I/O */
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.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
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L_PTE_WRITE,
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.prot_l1 = PMD_TYPE_TABLE,
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED |
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PMD_SECT_AP_WRITE | PMD_SECT_BUFFERABLE |
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PMD_SECT_TEX(1),
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.domain = DOMAIN_IO,
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},
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[MT_NONSHARED_DEVICE] = {
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.prot_l1 = PMD_TYPE_TABLE,
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.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_NONSHARED_DEV |
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PMD_SECT_AP_WRITE,
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.domain = DOMAIN_IO,
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}
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};
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/*
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* Adjust the PMD section entries according to the CPU in use.
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*/
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void __init build_mem_type_table(void)
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{
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struct cachepolicy *cp;
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unsigned int cr = get_cr();
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unsigned int user_pgprot, kern_pgprot;
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int cpu_arch = cpu_architecture();
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int i;
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#if defined(CONFIG_CPU_DCACHE_DISABLE)
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if (cachepolicy > CPOLICY_BUFFERED)
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cachepolicy = CPOLICY_BUFFERED;
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#elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
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if (cachepolicy > CPOLICY_WRITETHROUGH)
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cachepolicy = CPOLICY_WRITETHROUGH;
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#endif
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if (cpu_arch < CPU_ARCH_ARMv5) {
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if (cachepolicy >= CPOLICY_WRITEALLOC)
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cachepolicy = CPOLICY_WRITEBACK;
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ecc_mask = 0;
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}
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/*
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* Xscale must not have PMD bit 4 set for section mappings.
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*/
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if (cpu_is_xscale())
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for (i = 0; i < ARRAY_SIZE(mem_types); i++)
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mem_types[i].prot_sect &= ~PMD_BIT4;
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/*
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* ARMv5 and lower, excluding Xscale, bit 4 must be set for
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* page tables.
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*/
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if (cpu_arch < CPU_ARCH_ARMv6 && !cpu_is_xscale())
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for (i = 0; i < ARRAY_SIZE(mem_types); i++)
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if (mem_types[i].prot_l1)
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mem_types[i].prot_l1 |= PMD_BIT4;
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cp = &cache_policies[cachepolicy];
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kern_pgprot = user_pgprot = cp->pte;
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/*
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* Enable CPU-specific coherency if supported.
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* (Only available on XSC3 at the moment.)
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*/
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if (arch_is_coherent()) {
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if (cpu_is_xsc3()) {
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mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
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mem_types[MT_MEMORY].prot_pte |= L_PTE_COHERENT;
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}
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}
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/*
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* ARMv6 and above have extended page tables.
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*/
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if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
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/*
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* bit 4 becomes XN which we must clear for the
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* kernel memory mapping.
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*/
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mem_types[MT_MEMORY].prot_sect &= ~PMD_SECT_XN;
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mem_types[MT_ROM].prot_sect &= ~PMD_SECT_XN;
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/*
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* Mark cache clean areas and XIP ROM read only
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* from SVC mode and no access from userspace.
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*/
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mem_types[MT_ROM].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
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mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
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mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
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/*
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* Mark the device area as "shared device"
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*/
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mem_types[MT_DEVICE].prot_pte |= L_PTE_BUFFERABLE;
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mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
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/*
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* User pages need to be mapped with the ASID
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* (iow, non-global)
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*/
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user_pgprot |= L_PTE_ASID;
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#ifdef CONFIG_SMP
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/*
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* Mark memory with the "shared" attribute for SMP systems
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*/
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user_pgprot |= L_PTE_SHARED;
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kern_pgprot |= L_PTE_SHARED;
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mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
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#endif
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}
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for (i = 0; i < 16; i++) {
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unsigned long v = pgprot_val(protection_map[i]);
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v = (v & ~(L_PTE_BUFFERABLE|L_PTE_CACHEABLE)) | user_pgprot;
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protection_map[i] = __pgprot(v);
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}
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mem_types[MT_LOW_VECTORS].prot_pte |= kern_pgprot;
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mem_types[MT_HIGH_VECTORS].prot_pte |= kern_pgprot;
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if (cpu_arch >= CPU_ARCH_ARMv5) {
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#ifndef CONFIG_SMP
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/*
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* Only use write-through for non-SMP systems
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*/
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mem_types[MT_LOW_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
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mem_types[MT_HIGH_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
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#endif
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} else {
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mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1);
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}
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pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |
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L_PTE_DIRTY | L_PTE_WRITE |
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L_PTE_EXEC | kern_pgprot);
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mem_types[MT_LOW_VECTORS].prot_l1 |= ecc_mask;
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mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask;
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mem_types[MT_MEMORY].prot_sect |= ecc_mask | cp->pmd;
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mem_types[MT_ROM].prot_sect |= cp->pmd;
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switch (cp->pmd) {
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case PMD_SECT_WT:
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mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WT;
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break;
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case PMD_SECT_WB:
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case PMD_SECT_WBWA:
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mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WB;
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break;
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}
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printk("Memory policy: ECC %sabled, Data cache %s\n",
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ecc_mask ? "en" : "dis", cp->policy);
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}
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#define vectors_base() (vectors_high() ? 0xffff0000 : 0)
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/*
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* Create the page directory entries and any necessary
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* page tables for the mapping specified by `md'. We
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* are able to cope here with varying sizes and address
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* offsets, and we take full advantage of sections and
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* supersections.
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*/
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void __init create_mapping(struct map_desc *md)
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{
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unsigned long virt, length;
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int prot_sect, prot_l1, domain;
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pgprot_t prot_pte;
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unsigned long off = (u32)__pfn_to_phys(md->pfn);
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if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
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printk(KERN_WARNING "BUG: not creating mapping for "
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"0x%08llx at 0x%08lx in user region\n",
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__pfn_to_phys((u64)md->pfn), md->virtual);
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return;
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}
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if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
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md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) {
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printk(KERN_WARNING "BUG: mapping for 0x%08llx at 0x%08lx "
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"overlaps vmalloc space\n",
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__pfn_to_phys((u64)md->pfn), md->virtual);
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}
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domain = mem_types[md->type].domain;
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prot_pte = __pgprot(mem_types[md->type].prot_pte);
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prot_l1 = mem_types[md->type].prot_l1 | PMD_DOMAIN(domain);
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prot_sect = mem_types[md->type].prot_sect | PMD_DOMAIN(domain);
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/*
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* Catch 36-bit addresses
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*/
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if(md->pfn >= 0x100000) {
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if(domain) {
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printk(KERN_ERR "MM: invalid domain in supersection "
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"mapping for 0x%08llx at 0x%08lx\n",
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__pfn_to_phys((u64)md->pfn), md->virtual);
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return;
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}
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if((md->virtual | md->length | __pfn_to_phys(md->pfn))
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& ~SUPERSECTION_MASK) {
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printk(KERN_ERR "MM: cannot create mapping for "
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"0x%08llx at 0x%08lx invalid alignment\n",
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||||
__pfn_to_phys((u64)md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Shift bits [35:32] of address into bits [23:20] of PMD
|
||||
* (See ARMv6 spec).
|
||||
*/
|
||||
off |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);
|
||||
}
|
||||
|
||||
virt = md->virtual;
|
||||
off -= virt;
|
||||
length = md->length;
|
||||
|
||||
if (mem_types[md->type].prot_l1 == 0 &&
|
||||
(virt & 0xfffff || (virt + off) & 0xfffff || (virt + length) & 0xfffff)) {
|
||||
printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not "
|
||||
"be mapped using pages, ignoring.\n",
|
||||
__pfn_to_phys(md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
|
||||
while ((virt & 0xfffff || (virt + off) & 0xfffff) && length >= PAGE_SIZE) {
|
||||
alloc_init_page(virt, virt + off, prot_l1, prot_pte);
|
||||
|
||||
virt += PAGE_SIZE;
|
||||
length -= PAGE_SIZE;
|
||||
}
|
||||
|
||||
/* N.B. ARMv6 supersections are only defined to work with domain 0.
|
||||
* Since domain assignments can in fact be arbitrary, the
|
||||
* 'domain == 0' check below is required to insure that ARMv6
|
||||
* supersections are only allocated for domain 0 regardless
|
||||
* of the actual domain assignments in use.
|
||||
*/
|
||||
if ((cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3())
|
||||
&& domain == 0) {
|
||||
/*
|
||||
* Align to supersection boundary if !high pages.
|
||||
* High pages have already been checked for proper
|
||||
* alignment above and they will fail the SUPSERSECTION_MASK
|
||||
* check because of the way the address is encoded into
|
||||
* offset.
|
||||
*/
|
||||
if (md->pfn <= 0x100000) {
|
||||
while ((virt & ~SUPERSECTION_MASK ||
|
||||
(virt + off) & ~SUPERSECTION_MASK) &&
|
||||
length >= (PGDIR_SIZE / 2)) {
|
||||
alloc_init_section(virt, virt + off, prot_sect);
|
||||
|
||||
virt += (PGDIR_SIZE / 2);
|
||||
length -= (PGDIR_SIZE / 2);
|
||||
}
|
||||
}
|
||||
|
||||
while (length >= SUPERSECTION_SIZE) {
|
||||
alloc_init_supersection(virt, virt + off, prot_sect);
|
||||
|
||||
virt += SUPERSECTION_SIZE;
|
||||
length -= SUPERSECTION_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A section mapping covers half a "pgdir" entry.
|
||||
*/
|
||||
while (length >= (PGDIR_SIZE / 2)) {
|
||||
alloc_init_section(virt, virt + off, prot_sect);
|
||||
|
||||
virt += (PGDIR_SIZE / 2);
|
||||
length -= (PGDIR_SIZE / 2);
|
||||
}
|
||||
|
||||
while (length >= PAGE_SIZE) {
|
||||
alloc_init_page(virt, virt + off, prot_l1, prot_pte);
|
||||
|
||||
virt += PAGE_SIZE;
|
||||
length -= PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* In order to soft-boot, we need to insert a 1:1 mapping in place of
|
||||
* the user-mode pages. This will then ensure that we have predictable
|
||||
* results when turning the mmu off
|
||||
*/
|
||||
void setup_mm_for_reboot(char mode)
|
||||
{
|
||||
unsigned long base_pmdval;
|
||||
pgd_t *pgd;
|
||||
int i;
|
||||
|
||||
if (current->mm && current->mm->pgd)
|
||||
pgd = current->mm->pgd;
|
||||
else
|
||||
pgd = init_mm.pgd;
|
||||
|
||||
base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT;
|
||||
if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
|
||||
base_pmdval |= PMD_BIT4;
|
||||
|
||||
for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) {
|
||||
unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval;
|
||||
pmd_t *pmd;
|
||||
|
||||
pmd = pmd_off(pgd, i << PGDIR_SHIFT);
|
||||
pmd[0] = __pmd(pmdval);
|
||||
pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1)));
|
||||
flush_pmd_entry(pmd);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the architecture specific mappings
|
||||
*/
|
||||
void __init iotable_init(struct map_desc *io_desc, int nr)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < nr; i++)
|
||||
create_mapping(io_desc + i);
|
||||
}
|
||||
|
||||
@ -17,7 +17,6 @@ struct map_desc;
|
||||
struct meminfo;
|
||||
struct pglist_data;
|
||||
|
||||
void __init build_mem_type_table(void);
|
||||
void __init create_mapping(struct map_desc *md);
|
||||
void __init bootmem_init(struct meminfo *mi);
|
||||
void reserve_node_zero(struct pglist_data *pgdat);
|
||||
|
||||
@ -7,6 +7,7 @@
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/init.h>
|
||||
@ -40,6 +41,516 @@ struct page *empty_zero_page;
|
||||
*/
|
||||
pmd_t *top_pmd;
|
||||
|
||||
#define CPOLICY_UNCACHED 0
|
||||
#define CPOLICY_BUFFERED 1
|
||||
#define CPOLICY_WRITETHROUGH 2
|
||||
#define CPOLICY_WRITEBACK 3
|
||||
#define CPOLICY_WRITEALLOC 4
|
||||
|
||||
static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK;
|
||||
static unsigned int ecc_mask __initdata = 0;
|
||||
pgprot_t pgprot_kernel;
|
||||
|
||||
EXPORT_SYMBOL(pgprot_kernel);
|
||||
|
||||
struct cachepolicy {
|
||||
const char policy[16];
|
||||
unsigned int cr_mask;
|
||||
unsigned int pmd;
|
||||
unsigned int pte;
|
||||
};
|
||||
|
||||
static struct cachepolicy cache_policies[] __initdata = {
|
||||
{
|
||||
.policy = "uncached",
|
||||
.cr_mask = CR_W|CR_C,
|
||||
.pmd = PMD_SECT_UNCACHED,
|
||||
.pte = 0,
|
||||
}, {
|
||||
.policy = "buffered",
|
||||
.cr_mask = CR_C,
|
||||
.pmd = PMD_SECT_BUFFERED,
|
||||
.pte = PTE_BUFFERABLE,
|
||||
}, {
|
||||
.policy = "writethrough",
|
||||
.cr_mask = 0,
|
||||
.pmd = PMD_SECT_WT,
|
||||
.pte = PTE_CACHEABLE,
|
||||
}, {
|
||||
.policy = "writeback",
|
||||
.cr_mask = 0,
|
||||
.pmd = PMD_SECT_WB,
|
||||
.pte = PTE_BUFFERABLE|PTE_CACHEABLE,
|
||||
}, {
|
||||
.policy = "writealloc",
|
||||
.cr_mask = 0,
|
||||
.pmd = PMD_SECT_WBWA,
|
||||
.pte = PTE_BUFFERABLE|PTE_CACHEABLE,
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* These are useful for identifing cache coherency
|
||||
* problems by allowing the cache or the cache and
|
||||
* writebuffer to be turned off. (Note: the write
|
||||
* buffer should not be on and the cache off).
|
||||
*/
|
||||
static void __init early_cachepolicy(char **p)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
|
||||
int len = strlen(cache_policies[i].policy);
|
||||
|
||||
if (memcmp(*p, cache_policies[i].policy, len) == 0) {
|
||||
cachepolicy = i;
|
||||
cr_alignment &= ~cache_policies[i].cr_mask;
|
||||
cr_no_alignment &= ~cache_policies[i].cr_mask;
|
||||
*p += len;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (i == ARRAY_SIZE(cache_policies))
|
||||
printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n");
|
||||
flush_cache_all();
|
||||
set_cr(cr_alignment);
|
||||
}
|
||||
__early_param("cachepolicy=", early_cachepolicy);
|
||||
|
||||
static void __init early_nocache(char **__unused)
|
||||
{
|
||||
char *p = "buffered";
|
||||
printk(KERN_WARNING "nocache is deprecated; use cachepolicy=%s\n", p);
|
||||
early_cachepolicy(&p);
|
||||
}
|
||||
__early_param("nocache", early_nocache);
|
||||
|
||||
static void __init early_nowrite(char **__unused)
|
||||
{
|
||||
char *p = "uncached";
|
||||
printk(KERN_WARNING "nowb is deprecated; use cachepolicy=%s\n", p);
|
||||
early_cachepolicy(&p);
|
||||
}
|
||||
__early_param("nowb", early_nowrite);
|
||||
|
||||
static void __init early_ecc(char **p)
|
||||
{
|
||||
if (memcmp(*p, "on", 2) == 0) {
|
||||
ecc_mask = PMD_PROTECTION;
|
||||
*p += 2;
|
||||
} else if (memcmp(*p, "off", 3) == 0) {
|
||||
ecc_mask = 0;
|
||||
*p += 3;
|
||||
}
|
||||
}
|
||||
__early_param("ecc=", early_ecc);
|
||||
|
||||
static int __init noalign_setup(char *__unused)
|
||||
{
|
||||
cr_alignment &= ~CR_A;
|
||||
cr_no_alignment &= ~CR_A;
|
||||
set_cr(cr_alignment);
|
||||
return 1;
|
||||
}
|
||||
__setup("noalign", noalign_setup);
|
||||
|
||||
struct mem_types {
|
||||
unsigned int prot_pte;
|
||||
unsigned int prot_l1;
|
||||
unsigned int prot_sect;
|
||||
unsigned int domain;
|
||||
};
|
||||
|
||||
static struct mem_types mem_types[] __initdata = {
|
||||
[MT_DEVICE] = {
|
||||
.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_BIT4 | PMD_SECT_UNCACHED |
|
||||
PMD_SECT_AP_WRITE,
|
||||
.domain = DOMAIN_IO,
|
||||
},
|
||||
[MT_CACHECLEAN] = {
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
|
||||
.domain = DOMAIN_KERNEL,
|
||||
},
|
||||
[MT_MINICLEAN] = {
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_MINICACHE,
|
||||
.domain = DOMAIN_KERNEL,
|
||||
},
|
||||
[MT_LOW_VECTORS] = {
|
||||
.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
|
||||
L_PTE_EXEC,
|
||||
.prot_l1 = PMD_TYPE_TABLE,
|
||||
.domain = DOMAIN_USER,
|
||||
},
|
||||
[MT_HIGH_VECTORS] = {
|
||||
.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
|
||||
L_PTE_USER | L_PTE_EXEC,
|
||||
.prot_l1 = PMD_TYPE_TABLE,
|
||||
.domain = DOMAIN_USER,
|
||||
},
|
||||
[MT_MEMORY] = {
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_AP_WRITE,
|
||||
.domain = DOMAIN_KERNEL,
|
||||
},
|
||||
[MT_ROM] = {
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4,
|
||||
.domain = DOMAIN_KERNEL,
|
||||
},
|
||||
[MT_IXP2000_DEVICE] = { /* IXP2400 requires XCB=101 for on-chip I/O */
|
||||
.prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
|
||||
L_PTE_WRITE,
|
||||
.prot_l1 = PMD_TYPE_TABLE,
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED |
|
||||
PMD_SECT_AP_WRITE | PMD_SECT_BUFFERABLE |
|
||||
PMD_SECT_TEX(1),
|
||||
.domain = DOMAIN_IO,
|
||||
},
|
||||
[MT_NONSHARED_DEVICE] = {
|
||||
.prot_l1 = PMD_TYPE_TABLE,
|
||||
.prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_NONSHARED_DEV |
|
||||
PMD_SECT_AP_WRITE,
|
||||
.domain = DOMAIN_IO,
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* Adjust the PMD section entries according to the CPU in use.
|
||||
*/
|
||||
static void __init build_mem_type_table(void)
|
||||
{
|
||||
struct cachepolicy *cp;
|
||||
unsigned int cr = get_cr();
|
||||
unsigned int user_pgprot, kern_pgprot;
|
||||
int cpu_arch = cpu_architecture();
|
||||
int i;
|
||||
|
||||
#if defined(CONFIG_CPU_DCACHE_DISABLE)
|
||||
if (cachepolicy > CPOLICY_BUFFERED)
|
||||
cachepolicy = CPOLICY_BUFFERED;
|
||||
#elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
|
||||
if (cachepolicy > CPOLICY_WRITETHROUGH)
|
||||
cachepolicy = CPOLICY_WRITETHROUGH;
|
||||
#endif
|
||||
if (cpu_arch < CPU_ARCH_ARMv5) {
|
||||
if (cachepolicy >= CPOLICY_WRITEALLOC)
|
||||
cachepolicy = CPOLICY_WRITEBACK;
|
||||
ecc_mask = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Xscale must not have PMD bit 4 set for section mappings.
|
||||
*/
|
||||
if (cpu_is_xscale())
|
||||
for (i = 0; i < ARRAY_SIZE(mem_types); i++)
|
||||
mem_types[i].prot_sect &= ~PMD_BIT4;
|
||||
|
||||
/*
|
||||
* ARMv5 and lower, excluding Xscale, bit 4 must be set for
|
||||
* page tables.
|
||||
*/
|
||||
if (cpu_arch < CPU_ARCH_ARMv6 && !cpu_is_xscale())
|
||||
for (i = 0; i < ARRAY_SIZE(mem_types); i++)
|
||||
if (mem_types[i].prot_l1)
|
||||
mem_types[i].prot_l1 |= PMD_BIT4;
|
||||
|
||||
cp = &cache_policies[cachepolicy];
|
||||
kern_pgprot = user_pgprot = cp->pte;
|
||||
|
||||
/*
|
||||
* Enable CPU-specific coherency if supported.
|
||||
* (Only available on XSC3 at the moment.)
|
||||
*/
|
||||
if (arch_is_coherent()) {
|
||||
if (cpu_is_xsc3()) {
|
||||
mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
|
||||
mem_types[MT_MEMORY].prot_pte |= L_PTE_COHERENT;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* ARMv6 and above have extended page tables.
|
||||
*/
|
||||
if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
|
||||
/*
|
||||
* bit 4 becomes XN which we must clear for the
|
||||
* kernel memory mapping.
|
||||
*/
|
||||
mem_types[MT_MEMORY].prot_sect &= ~PMD_SECT_XN;
|
||||
mem_types[MT_ROM].prot_sect &= ~PMD_SECT_XN;
|
||||
|
||||
/*
|
||||
* Mark cache clean areas and XIP ROM read only
|
||||
* from SVC mode and no access from userspace.
|
||||
*/
|
||||
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;
|
||||
|
||||
/*
|
||||
* Mark the device area as "shared device"
|
||||
*/
|
||||
mem_types[MT_DEVICE].prot_pte |= L_PTE_BUFFERABLE;
|
||||
mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
|
||||
|
||||
/*
|
||||
* User pages need to be mapped with the ASID
|
||||
* (iow, non-global)
|
||||
*/
|
||||
user_pgprot |= L_PTE_ASID;
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
/*
|
||||
* Mark memory with the "shared" attribute for SMP systems
|
||||
*/
|
||||
user_pgprot |= L_PTE_SHARED;
|
||||
kern_pgprot |= L_PTE_SHARED;
|
||||
mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
|
||||
#endif
|
||||
}
|
||||
|
||||
for (i = 0; i < 16; i++) {
|
||||
unsigned long v = pgprot_val(protection_map[i]);
|
||||
v = (v & ~(L_PTE_BUFFERABLE|L_PTE_CACHEABLE)) | user_pgprot;
|
||||
protection_map[i] = __pgprot(v);
|
||||
}
|
||||
|
||||
mem_types[MT_LOW_VECTORS].prot_pte |= kern_pgprot;
|
||||
mem_types[MT_HIGH_VECTORS].prot_pte |= kern_pgprot;
|
||||
|
||||
if (cpu_arch >= CPU_ARCH_ARMv5) {
|
||||
#ifndef CONFIG_SMP
|
||||
/*
|
||||
* Only use write-through for non-SMP systems
|
||||
*/
|
||||
mem_types[MT_LOW_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
|
||||
mem_types[MT_HIGH_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
|
||||
#endif
|
||||
} else {
|
||||
mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1);
|
||||
}
|
||||
|
||||
pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |
|
||||
L_PTE_DIRTY | L_PTE_WRITE |
|
||||
L_PTE_EXEC | kern_pgprot);
|
||||
|
||||
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_ROM].prot_sect |= cp->pmd;
|
||||
|
||||
switch (cp->pmd) {
|
||||
case PMD_SECT_WT:
|
||||
mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WT;
|
||||
break;
|
||||
case PMD_SECT_WB:
|
||||
case PMD_SECT_WBWA:
|
||||
mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WB;
|
||||
break;
|
||||
}
|
||||
printk("Memory policy: ECC %sabled, Data cache %s\n",
|
||||
ecc_mask ? "en" : "dis", cp->policy);
|
||||
}
|
||||
|
||||
#define vectors_base() (vectors_high() ? 0xffff0000 : 0)
|
||||
|
||||
/*
|
||||
* Create a SECTION PGD between VIRT and PHYS in domain
|
||||
* DOMAIN with protection PROT. This operates on half-
|
||||
* pgdir entry increments.
|
||||
*/
|
||||
static inline void
|
||||
alloc_init_section(unsigned long virt, unsigned long phys, int prot)
|
||||
{
|
||||
pmd_t *pmdp = pmd_off_k(virt);
|
||||
|
||||
if (virt & (1 << 20))
|
||||
pmdp++;
|
||||
|
||||
*pmdp = __pmd(phys | prot);
|
||||
flush_pmd_entry(pmdp);
|
||||
}
|
||||
|
||||
/*
|
||||
* Create a SUPER SECTION PGD between VIRT and PHYS with protection PROT
|
||||
*/
|
||||
static inline void
|
||||
alloc_init_supersection(unsigned long virt, unsigned long phys, int prot)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 16; i += 1) {
|
||||
alloc_init_section(virt, phys, prot | PMD_SECT_SUPER);
|
||||
|
||||
virt += (PGDIR_SIZE / 2);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Add a PAGE mapping between VIRT and PHYS in domain
|
||||
* DOMAIN with protection PROT. Note that due to the
|
||||
* way we map the PTEs, we must allocate two PTE_SIZE'd
|
||||
* blocks - one for the Linux pte table, and one for
|
||||
* the hardware pte table.
|
||||
*/
|
||||
static inline void
|
||||
alloc_init_page(unsigned long virt, unsigned long phys, unsigned int prot_l1, pgprot_t prot)
|
||||
{
|
||||
pmd_t *pmdp = pmd_off_k(virt);
|
||||
pte_t *ptep;
|
||||
|
||||
if (pmd_none(*pmdp)) {
|
||||
ptep = alloc_bootmem_low_pages(2 * PTRS_PER_PTE *
|
||||
sizeof(pte_t));
|
||||
|
||||
__pmd_populate(pmdp, __pa(ptep) | prot_l1);
|
||||
}
|
||||
ptep = pte_offset_kernel(pmdp, virt);
|
||||
|
||||
set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the page directory entries and any necessary
|
||||
* page tables for the mapping specified by `md'. We
|
||||
* are able to cope here with varying sizes and address
|
||||
* offsets, and we take full advantage of sections and
|
||||
* supersections.
|
||||
*/
|
||||
void __init create_mapping(struct map_desc *md)
|
||||
{
|
||||
unsigned long virt, length;
|
||||
int prot_sect, prot_l1, domain;
|
||||
pgprot_t prot_pte;
|
||||
unsigned long off = (u32)__pfn_to_phys(md->pfn);
|
||||
|
||||
if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
|
||||
printk(KERN_WARNING "BUG: not creating mapping for "
|
||||
"0x%08llx at 0x%08lx in user region\n",
|
||||
__pfn_to_phys((u64)md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
|
||||
if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
|
||||
md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) {
|
||||
printk(KERN_WARNING "BUG: mapping for 0x%08llx at 0x%08lx "
|
||||
"overlaps vmalloc space\n",
|
||||
__pfn_to_phys((u64)md->pfn), md->virtual);
|
||||
}
|
||||
|
||||
domain = mem_types[md->type].domain;
|
||||
prot_pte = __pgprot(mem_types[md->type].prot_pte);
|
||||
prot_l1 = mem_types[md->type].prot_l1 | PMD_DOMAIN(domain);
|
||||
prot_sect = mem_types[md->type].prot_sect | PMD_DOMAIN(domain);
|
||||
|
||||
/*
|
||||
* Catch 36-bit addresses
|
||||
*/
|
||||
if(md->pfn >= 0x100000) {
|
||||
if(domain) {
|
||||
printk(KERN_ERR "MM: invalid domain in supersection "
|
||||
"mapping for 0x%08llx at 0x%08lx\n",
|
||||
__pfn_to_phys((u64)md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
if((md->virtual | md->length | __pfn_to_phys(md->pfn))
|
||||
& ~SUPERSECTION_MASK) {
|
||||
printk(KERN_ERR "MM: cannot create mapping for "
|
||||
"0x%08llx at 0x%08lx invalid alignment\n",
|
||||
__pfn_to_phys((u64)md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Shift bits [35:32] of address into bits [23:20] of PMD
|
||||
* (See ARMv6 spec).
|
||||
*/
|
||||
off |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);
|
||||
}
|
||||
|
||||
virt = md->virtual;
|
||||
off -= virt;
|
||||
length = md->length;
|
||||
|
||||
if (mem_types[md->type].prot_l1 == 0 &&
|
||||
(virt & 0xfffff || (virt + off) & 0xfffff || (virt + length) & 0xfffff)) {
|
||||
printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not "
|
||||
"be mapped using pages, ignoring.\n",
|
||||
__pfn_to_phys(md->pfn), md->virtual);
|
||||
return;
|
||||
}
|
||||
|
||||
while ((virt & 0xfffff || (virt + off) & 0xfffff) && length >= PAGE_SIZE) {
|
||||
alloc_init_page(virt, virt + off, prot_l1, prot_pte);
|
||||
|
||||
virt += PAGE_SIZE;
|
||||
length -= PAGE_SIZE;
|
||||
}
|
||||
|
||||
/* N.B. ARMv6 supersections are only defined to work with domain 0.
|
||||
* Since domain assignments can in fact be arbitrary, the
|
||||
* 'domain == 0' check below is required to insure that ARMv6
|
||||
* supersections are only allocated for domain 0 regardless
|
||||
* of the actual domain assignments in use.
|
||||
*/
|
||||
if ((cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3())
|
||||
&& domain == 0) {
|
||||
/*
|
||||
* Align to supersection boundary if !high pages.
|
||||
* High pages have already been checked for proper
|
||||
* alignment above and they will fail the SUPSERSECTION_MASK
|
||||
* check because of the way the address is encoded into
|
||||
* offset.
|
||||
*/
|
||||
if (md->pfn <= 0x100000) {
|
||||
while ((virt & ~SUPERSECTION_MASK ||
|
||||
(virt + off) & ~SUPERSECTION_MASK) &&
|
||||
length >= (PGDIR_SIZE / 2)) {
|
||||
alloc_init_section(virt, virt + off, prot_sect);
|
||||
|
||||
virt += (PGDIR_SIZE / 2);
|
||||
length -= (PGDIR_SIZE / 2);
|
||||
}
|
||||
}
|
||||
|
||||
while (length >= SUPERSECTION_SIZE) {
|
||||
alloc_init_supersection(virt, virt + off, prot_sect);
|
||||
|
||||
virt += SUPERSECTION_SIZE;
|
||||
length -= SUPERSECTION_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A section mapping covers half a "pgdir" entry.
|
||||
*/
|
||||
while (length >= (PGDIR_SIZE / 2)) {
|
||||
alloc_init_section(virt, virt + off, prot_sect);
|
||||
|
||||
virt += (PGDIR_SIZE / 2);
|
||||
length -= (PGDIR_SIZE / 2);
|
||||
}
|
||||
|
||||
while (length >= PAGE_SIZE) {
|
||||
alloc_init_page(virt, virt + off, prot_l1, prot_pte);
|
||||
|
||||
virt += PAGE_SIZE;
|
||||
length -= PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the architecture specific mappings
|
||||
*/
|
||||
void __init iotable_init(struct map_desc *io_desc, int nr)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < nr; i++)
|
||||
create_mapping(io_desc + i);
|
||||
}
|
||||
|
||||
static inline void prepare_page_table(struct meminfo *mi)
|
||||
{
|
||||
unsigned long addr;
|
||||
@ -227,3 +738,34 @@ void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
|
||||
empty_zero_page = virt_to_page(zero_page);
|
||||
flush_dcache_page(empty_zero_page);
|
||||
}
|
||||
|
||||
/*
|
||||
* In order to soft-boot, we need to insert a 1:1 mapping in place of
|
||||
* the user-mode pages. This will then ensure that we have predictable
|
||||
* results when turning the mmu off
|
||||
*/
|
||||
void setup_mm_for_reboot(char mode)
|
||||
{
|
||||
unsigned long base_pmdval;
|
||||
pgd_t *pgd;
|
||||
int i;
|
||||
|
||||
if (current->mm && current->mm->pgd)
|
||||
pgd = current->mm->pgd;
|
||||
else
|
||||
pgd = init_mm.pgd;
|
||||
|
||||
base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT;
|
||||
if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
|
||||
base_pmdval |= PMD_BIT4;
|
||||
|
||||
for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) {
|
||||
unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval;
|
||||
pmd_t *pmd;
|
||||
|
||||
pmd = pmd_off(pgd, i << PGDIR_SHIFT);
|
||||
pmd[0] = __pmd(pmdval);
|
||||
pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1)));
|
||||
flush_pmd_entry(pmd);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user