summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kernel
diff options
context:
space:
mode:
authorHsin-Yi Wang <hsinyi@chromium.org>2019-08-23 14:24:50 +0800
committerWill Deacon <will@kernel.org>2019-08-23 16:39:16 +0100
commite112b032a72c78f15d0c803c5dc6be444c2e6c66 (patch)
tree1356af931f59efe60649b3ab929fe822ebfe3e5b /arch/arm64/kernel
parente21a712a9685488f5ce80495b37b9fdbe96c230d (diff)
downloadlinux-e112b032a72c78f15d0c803c5dc6be444c2e6c66.tar.bz2
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>
Diffstat (limited to 'arch/arm64/kernel')
-rw-r--r--arch/arm64/kernel/kaslr.c5
-rw-r--r--arch/arm64/kernel/setup.c9
2 files changed, 9 insertions, 5 deletions
diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
index 708051655ad9..d94a3e41cef9 100644
--- a/arch/arm64/kernel/kaslr.c
+++ b/arch/arm64/kernel/kaslr.c
@@ -62,9 +62,6 @@ out:
return default_cmdline;
}
-extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size,
- pgprot_t prot);
-
/*
* This routine will be executed with the kernel mapped at its default virtual
* address, and if it returns successfully, the kernel will be remapped, and
@@ -93,7 +90,7 @@ u64 __init kaslr_early_init(u64 dt_phys)
* attempt at mapping the FDT in setup_machine()
*/
early_fixmap_init();
- fdt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
+ fdt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
if (!fdt)
return 0;
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 9c4bad7d7131..25f5127210f8 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -170,9 +170,13 @@ static void __init smp_build_mpidr_hash(void)
static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
- void *dt_virt = fixmap_remap_fdt(dt_phys);
+ int size;
+ void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
const char *name;
+ if (dt_virt)
+ memblock_reserve(dt_phys, size);
+
if (!dt_virt || !early_init_dt_scan(dt_virt)) {
pr_crit("\n"
"Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
@@ -184,6 +188,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
cpu_relax();
}
+ /* Early fixups are done, map the FDT as read-only now */
+ fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
+
name = of_flat_dt_get_machine_name();
if (!name)
return;