kvmfornfv -

Age	Commit message (Expand)	Author	Files	Lines
2015-08-04	Add the rt linux 4.1.3-rt3 as base	Yunhong Jiang	1	-0/+225

#include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <asm/cputype.h> #include <asm/idmap.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> #include <asm/sections.h> #include <asm/system_info.h> /* * Note: accesses outside of the kernel image and the identity map area * are not supported on any CPU using the idmap tables as its current * page tables. */ pgd_t *idmap_pgd; phys_addr_t (*arch_virt_to_idmap) (unsigned long x); #ifdef CONFIG_ARM_LPAE static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end, unsigned long prot) { pmd_t *pmd; unsigned long next; if (pud_none_or_clear_bad(pud) || (pud_val(*pud) & L_PGD_SWAPPER)) { pmd = pmd_alloc_one(&init_mm, addr); if (!pmd) { pr_warn("Failed to allocate identity pmd.\n"); return; } /* * Copy the original PMD to ensure that the PMD entries for * the kernel image are preserved. */ if (!pud_none(*pud)) memcpy(pmd, pmd_offset(pud, 0), PTRS_PER_PMD * sizeof(pmd_t)); pud_populate(&init_mm, pud, pmd); pmd += pmd_index(addr); } else pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); *pmd = __pmd((addr & PMD_MASK) | prot); flush_pmd_entry(pmd); } while (pmd++, addr = next, addr != end); } #else /* !CONFIG_ARM_LPAE */ static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end, unsigned long prot) { pmd_t *pmd = pmd_offset(pud, addr); addr = (addr & PMD_MASK) | prot; pmd[0] = __pmd(addr); addr += SECTION_SIZE; pmd[1] = __pmd(addr); flush_pmd_entry(pmd); } #endif /* CONFIG_ARM_LPAE */ static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end, unsigned long prot) { pud_t *pud = pud_offset(pgd, addr); unsigned long next; do { next = pud_addr_end(addr, end); idmap_add_pmd(pud, addr, next, prot); } while (pud++, addr = next, addr != end); } static void identity_mapping_add(pgd_t *pgd, const char *text_start, const char *text_end, unsigned long prot) { unsigned long addr, end; unsigned long next; addr = virt_to_idmap(text_start); end = virt_to_idmap(text_end); pr_info("Setting up static identity map for 0x%lx - 0x%lx\n", addr, end); prot |= PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AF; if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale()) prot |= PMD_BIT4; pgd += pgd_index(addr); do { next = pgd_addr_end(addr, end); idmap_add_pud(pgd, addr, next, prot); } while (pgd++, addr = next, addr != end); } extern char __idmap_text_start[], __idmap_text_end[]; static int __init init_static_idmap(void) { idmap_pgd = pgd_alloc(&init_mm); if (!idmap_pgd) return -ENOMEM; identity_mapping_add(idmap_pgd, __idmap_text_start, __idmap_text_end, 0); /* Flush L1 for the hardware to see this page table content */ flush_cache_louis(); return 0; } early_initcall(init_static_idmap); /* * In order to soft-boot, we need to switch to a 1:1 mapping for the * cpu_reset functions. This will then ensure that we have predictable * results when turning off the mmu. */ void setup_mm_for_reboot(void) { /* Switch to the identity mapping. */ cpu_switch_mm(idmap_pgd, &init_mm); local_flush_bp_all(); #ifdef CONFIG_CPU_HAS_ASID /* * We don't have a clean ASID for the identity mapping, which * may clash with virtual addresses of the previous page tables * and therefore potentially in the TLB. */ local_flush_tlb_all(); #endif }