arm64: map FDT as RW for early_init_dt_scan()
Currently in arm64, FDT is mapped to RO before it's passed to early_init_dt_scan(). However, there might be some codes (eg. commit "fdt: add support for rng-seed") that need to modify FDT during init. Map FDT to RO after early fixups are done. Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Will Deacon <will@kernel.org>
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@ -126,7 +126,7 @@ extern void init_mem_pgprot(void);
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extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
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unsigned long virt, phys_addr_t size,
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pgprot_t prot, bool page_mappings_only);
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extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
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extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
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extern void mark_linear_text_alias_ro(void);
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#define INIT_MM_CONTEXT(name) \
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@ -62,9 +62,6 @@ out:
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return default_cmdline;
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}
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extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size,
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pgprot_t prot);
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/*
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* This routine will be executed with the kernel mapped at its default virtual
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* address, and if it returns successfully, the kernel will be remapped, and
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@ -93,7 +90,7 @@ u64 __init kaslr_early_init(u64 dt_phys)
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* attempt at mapping the FDT in setup_machine()
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*/
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early_fixmap_init();
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fdt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
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fdt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
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if (!fdt)
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return 0;
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@ -170,9 +170,13 @@ static void __init smp_build_mpidr_hash(void)
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static void __init setup_machine_fdt(phys_addr_t dt_phys)
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{
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void *dt_virt = fixmap_remap_fdt(dt_phys);
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int size;
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void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
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const char *name;
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if (dt_virt)
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memblock_reserve(dt_phys, size);
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if (!dt_virt || !early_init_dt_scan(dt_virt)) {
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pr_crit("\n"
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"Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
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@ -184,6 +188,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
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cpu_relax();
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}
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/* Early fixups are done, map the FDT as read-only now */
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fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
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name = of_flat_dt_get_machine_name();
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if (!name)
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return;
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@ -876,7 +876,7 @@ void __set_fixmap(enum fixed_addresses idx,
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}
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}
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void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
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void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
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{
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const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
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int offset;
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@ -929,19 +929,6 @@ void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
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return dt_virt;
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}
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void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
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{
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void *dt_virt;
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int size;
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dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
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if (!dt_virt)
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return NULL;
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memblock_reserve(dt_phys, size);
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return dt_virt;
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}
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int __init arch_ioremap_p4d_supported(void)
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{
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return 0;
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