diff options
Diffstat (limited to 'arch/powerpc/lib/feature-fixups.c')
| -rw-r--r-- | arch/powerpc/lib/feature-fixups.c | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c index 80def1c2afcb..587c8cf1230f 100644 --- a/arch/powerpc/lib/feature-fixups.c +++ b/arch/powerpc/lib/feature-fixups.c @@ -16,7 +16,7 @@ #include <linux/sched/mm.h> #include <linux/stop_machine.h> #include <asm/cputable.h> -#include <asm/code-patching.h> +#include <asm/text-patching.h> #include <asm/interrupt.h> #include <asm/page.h> #include <asm/sections.h> @@ -25,6 +25,13 @@ #include <asm/firmware.h> #include <asm/inst.h> +/* + * Used to generate warnings if mmu or cpu feature check functions that + * use static keys before they are initialized. + */ +bool static_key_feature_checks_initialized __read_mostly; +EXPORT_SYMBOL_GPL(static_key_feature_checks_initialized); + struct fixup_entry { unsigned long mask; unsigned long value; @@ -67,7 +74,8 @@ static int patch_alt_instruction(u32 *src, u32 *dest, u32 *alt_start, u32 *alt_e return 0; } -static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) +static int patch_feature_section_mask(unsigned long value, unsigned long mask, + struct fixup_entry *fcur) { u32 *start, *end, *alt_start, *alt_end, *src, *dest; @@ -79,7 +87,7 @@ static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) if ((alt_end - alt_start) > (end - start)) return 1; - if ((value & fcur->mask) == fcur->value) + if ((value & fcur->mask & mask) == (fcur->value & mask)) return 0; src = alt_start; @@ -97,7 +105,8 @@ static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) return 0; } -void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) +static void do_feature_fixups_mask(unsigned long value, unsigned long mask, + void *fixup_start, void *fixup_end) { struct fixup_entry *fcur, *fend; @@ -105,7 +114,7 @@ void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) fend = fixup_end; for (; fcur < fend; fcur++) { - if (patch_feature_section(value, fcur)) { + if (patch_feature_section_mask(value, mask, fcur)) { WARN_ON(1); printk("Unable to patch feature section at %p - %p" \ " with %p - %p\n", @@ -117,6 +126,11 @@ void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) } } +void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) +{ + do_feature_fixups_mask(value, ~0, fixup_start, fixup_end); +} + #ifdef CONFIG_PPC_BARRIER_NOSPEC static bool is_fixup_addr_valid(void *dest, size_t size) { @@ -651,6 +665,17 @@ void __init apply_feature_fixups(void) do_final_fixups(); } +void __init update_mmu_feature_fixups(unsigned long mask) +{ + saved_mmu_features &= ~mask; + saved_mmu_features |= cur_cpu_spec->mmu_features & mask; + + do_feature_fixups_mask(cur_cpu_spec->mmu_features, mask, + PTRRELOC(&__start___mmu_ftr_fixup), + PTRRELOC(&__stop___mmu_ftr_fixup)); + mmu_feature_keys_init(); +} + void __init setup_feature_keys(void) { /* @@ -661,6 +686,7 @@ void __init setup_feature_keys(void) jump_label_init(); cpu_feature_keys_init(); mmu_feature_keys_init(); + static_key_feature_checks_initialized = true; } static int __init check_features(void) @@ -683,6 +709,11 @@ late_initcall(check_features); #define check(x) \ if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__); +static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) +{ + return patch_feature_section_mask(value, ~0, fcur); +} + /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */ static struct fixup_entry fixup; |