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4e8ee7de22
The ARM SMP booting code allocates a temporary set of page tables containing an identity mapping of the kernel image and provides this to secondary CPUs for initial booting. In reality, we only need to include the __turn_mmu_on function in the identity mapping since the rest of the kernel is executing from virtual addresses after this point. This patch adds __turn_mmu_on to the .idmap.text section, allowing the SMP booting code to use the idmap_pgd directly and not have to populate its own set of page table. As a result of this patch, we can make the identity_mapping_add function static (since it is only used within mm/idmap.c) and also remove the identity_mapping_del function. The identity map population is moved to an early initcall so that it is setup in time for secondary CPU bringup. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
#include <linux/kernel.h>
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#include <asm/cputype.h>
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#include <asm/idmap.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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pgd_t *idmap_pgd;
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static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
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unsigned long prot)
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{
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pmd_t *pmd = pmd_offset(pud, addr);
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addr = (addr & PMD_MASK) | prot;
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pmd[0] = __pmd(addr);
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addr += SECTION_SIZE;
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pmd[1] = __pmd(addr);
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flush_pmd_entry(pmd);
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}
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static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
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unsigned long prot)
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{
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pud_t *pud = pud_offset(pgd, addr);
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unsigned long next;
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do {
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next = pud_addr_end(addr, end);
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idmap_add_pmd(pud, addr, next, prot);
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} while (pud++, addr = next, addr != end);
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}
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static void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
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{
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unsigned long prot, next;
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prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
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if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
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prot |= PMD_BIT4;
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pgd += pgd_index(addr);
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do {
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next = pgd_addr_end(addr, end);
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idmap_add_pud(pgd, addr, next, prot);
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} while (pgd++, addr = next, addr != end);
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}
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extern char __idmap_text_start[], __idmap_text_end[];
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static int __init init_static_idmap(void)
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{
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phys_addr_t idmap_start, idmap_end;
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idmap_pgd = pgd_alloc(&init_mm);
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if (!idmap_pgd)
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return -ENOMEM;
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/* Add an identity mapping for the physical address of the section. */
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idmap_start = virt_to_phys((void *)__idmap_text_start);
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idmap_end = virt_to_phys((void *)__idmap_text_end);
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pr_info("Setting up static identity map for 0x%llx - 0x%llx\n",
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(long long)idmap_start, (long long)idmap_end);
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identity_mapping_add(idmap_pgd, idmap_start, idmap_end);
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return 0;
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}
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early_initcall(init_static_idmap);
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/*
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* In order to soft-boot, we need to switch to a 1:1 mapping for the
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* cpu_reset functions. This will then ensure that we have predictable
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* results when turning off the mmu.
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*/
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void setup_mm_for_reboot(void)
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{
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/* Clean and invalidate L1. */
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flush_cache_all();
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/* Switch to the identity mapping. */
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cpu_switch_mm(idmap_pgd, &init_mm);
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/* Flush the TLB. */
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local_flush_tlb_all();
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}
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